Drilling Of Horizontal Wells Research Articles

Emerging the dual string drilling and dual coil tubing drilling technology in a geothermal well applications

The challenges found in geothermal well drilling have forced the industry to develop new significant cost effective, time saver technologies to go for deeper geothermal resources beyond their traditional limits. To overcome these challenges, the new Dual String Drilling (DSD) technology which is based on penetration pathway of drilling fluid and rock cuttings during drilling a well. The principle of DSD employs drilling fluid flows through the annulus of inner and outer string pipe while cutting from the bottom of the well through inner pipe. The paper describes the novel Dual String Drilling (DSD) technology, predicting their occurrence and advantages on drilling of geothermal well. The outcome shows that with DSD approach a lot of time will be saved to circulate the kick out of the well. Additionally, the characteristic response of DSD enables to improve the hole cleaning capacity, to prevent pipe stuck, better well stability, reduction in torque and drag, to remove the dynamic equivalent circulating density gradient in geothermal wells. Moreover, the paper also depicts the system and method for dual coil tubing drilling of horizontal well which follows the same principle as DSD. The comparison of DSD with conventional drilling assesses that the DSD technology is affordable and appropriate for geothermal well drilling.

The concept of application of oscillation energy in modern technologies of directional drilling

In the process of research, there was investigated the question of influence of rotary movement of washing fluid on hydrodynamic processes with the purpose of enhancement of its transportation properties, especially in the process of drilling of horizontal wells. At present stage of science and technology development, improvement of effectiveness of drilling of horizontal wells is done at the expense of improvement of hydrodynamic circulation processes that prevent complications related to stability disturbances of well walls, formation of stagnation zones, and separation of sludge with significant reduction of energy costs. The matter of the article is related to the process of formation of stability of rotary-forward motion of washing fluid in the annulus of horizontal well directly by the energy of the flow, and also substantiation of methods of regulation of hydrodynamic parameters and flow structure with consideration of concrete geological and technical conditions.

Drag‐Reduction Performance Evaluation of Controllable Hybrid Steering Drilling System

The excessive drag/torque and the backing pressure is an important factor that restricts the improvement of the penetration rate and the extension of the drilling in the sliding drilling process of extended‐reach wells and horizontal wells. To deal with this problem, this paper developed a novel controllable hybrid steering drilling system (CHSDS) based on the friction‐reducing principle of a rotating drill string. The CHSDS is composed of a gear clutch, hydraulic system, and measurement and control system. By controlling the meshing and separation of the clutch with the mud pulse signal, the CHSDS has two working states, which leads to two boundary conditions. Combined with the stiff‐string drag torque model, the effects of the drilling parameters on the friction‐reducing performance of the CHSDS are analyzed systematically. The results show that the friction reduction effect in the inclined section is the most significant, followed by that in the horizontal section, whereas there is almost no impact in the vertical section. Friction reduction increases with the rotary speed and the drilling fluid density, whereas it decreases with the increase in the surface weight‐on‐bit and the bit reaction torque. Field tests confirm the separation and meshing function of the CHSDS. The developed controllable hybrid steering and friction‐reducing technology provides an alternative approach for the safe and high‐efficiency drilling of horizontal wells.

Construction and prospect of China's shale gas technical standard system

Shale gas is as an emerging industry and its development is highly concerned in China. Under the guidance and support of national industrial policies, shale gas industry develops rapidly and has already stepped into the stage of large-scale exploitation of shale gas buried less than 3500 m deep underground. In order to standardize the healthy and rapid development of shale gas industry, ensure available standards for the national supervision on shale gas exploration and development and quickly copy the technologies in the efficient exploration and development of shale gas, it is necessary to formulate the technical standards and technical standard system of the whole shale gas industry chain. In this paper, the current situations of shale gas exploration and development technologies in China were analyzed. Then the role and significance of the formulation of shale gas technical standards in promoting the progress of shale gas technologies were described in detail. Finally, the development direction of shale gas exploration technology and standard formulation was predicted. And the following research results were obtained. First, China has established the exploration and development theories and technical systems that are in line with national conditions, and 27 distinguished technologies of 6 technical series have been developed, including comprehensive geological evaluation of shale gas, development optimization, optimized and fast drilling of horizontal wells, stimulated reservoir volume of horizontal wells, factory-like operation, and distinguished, efficient and clean exploitation. Second, 173 distinguished shale gas standards have been formulated, and they provide a powerful support for the quality and fast development of China's shale gas industry. The annual output of shale gas in 2019 is 143.6 × 108 m3. In conclusion, the construction of shale gas technical standard system promotes the continuous improvement of shale gas exploration and development technologies, impels the significant upgrading of technical level and ensures the all-around HSE control.

Study of mud weight window of horizontal wells drilled into offshore natural gas hydrate sediments

Drilling horizontal wells into natural gas hydrate (NGH) sediments may be one of the most promising methods to increase the cost effectiveness of the exploration of NGH. However, many challenges, such as wellbore collapse and wellbore fracturing, will be encountered. Therefore, an accurate prediction of the mud weight window (MWW) is very important. In this work, a model was built to calculate the MWW of horizontal wells drilled into offshore NGH sediments, considering the NGH saturation and the effects of inlet parameters of the drilling mud, and was combined with the transient heat transfer model to calculate the temperature distribution of the borehole. A case study was carried out, and the effects of several parameters were discussed: 1) When drilling horizontal wells in NGH sediments, the dissociation of NGH in the formation will not occur. 2) With increasing circulation time, the borehole will be cooled, and the cooling effect will lead to a decrease in both the fracture pressure and collapse pressure of the target zone. 3) The mud flow rate has a large influence on the mud temperature profile, especially in the horizontal section, and a higher mud flow rate leads to a lower fracture pressure and collapse pressure in the target zone. 4) The inlet temperature has limited influences on the mud temperature profile in the horizontal section and the MWW of the target zone. 5) The saturation of NGH in a formation has a significant influence on the collapse pressure but little influence on the fracture pressure, and higher saturation will lead to a wider MWW. This study will support the safe control of well stability and application of horizontal wells drilled into offshore NGH sediments.

Sandbody architecture analysis of braided river reservoirs and their significance for remaining oil distribution: A case study based on a new outcrop in the Songliao Basin, Northeast China

The reservoir architecture analysis of braided rivers, especially falling-silt seam forms, has played a key role in predicting remaining oil distributions. However, no studies have used architecture analyses that document braided river outcrops and researched the tapping of the few remaining oil distributions based on outcrops in the Songliao basin, northeast China. In this paper, the architecture characteristics and remaining oil distribution of braided river reservoirs are studied using a combination of an outcrop, modern deposition and subsurface well data. The new 8–13 m thick Lower Cretaceous Quantou Formation outcrop of the Songliao basin is a braided fluvial succession arranged in one large fining-upward cycle. Eight facies (Gt, St, Sm, Sh, Sp, Sw, Fl and Fm), four architecture elements (CH, DA, LV, and FF), and three orders of bounding surfaces (third-, fourth-, and fifth-order) are recognized. A new distribution pattern of falling-silt seams and a braided river architecture model are presented according to the analysis of the outcrop. In the mid-channel bar, the falling-silt seams thin from the mid-bar to the bar tail following the flow direction. Each falling-silt seam is oriented tangentially to the basal surface of the mid-channel bar, and the upper falling-silt seam extends farther than the lower one. In a Daqing Oilfield exploitation block in the Songliao basin, while channels and bars are the main reservoir units, they have different remaining oil distribution patterns. For bars, water injection wells located at the mid-bar, zonal injection technology, the drilling of horizontal wells, and proper well patterns are proposed. Fourth-order bounding surfaces, single braided channels, stacking patterns, and the lateral blocking of levees and floodplains are the key factors affecting the remaining oil distribution in channels.

Automated Microseismic Processing and Integrated Interpretation of Induced Seismicity during a Multistage Hydraulic-Fracturing Stimulation, Alberta, Canada

ABSTRACT The development of organic-rich, low-permeability formations for hydrocarbon production requires the use of unconventional techniques such as multiwell pad drilling of horizontal wells and massive multistage hydraulic-fracturing stimulations. However, proliferation of these unconventional development methods has been linked to localized cases of fault reactivation during or shortly after hydraulic fracturing. In the Duvernay formation, located in Alberta, Canada, induced seismicity from hydraulic fracturing has occurred on nearly vertical strike-slip faults that are difficult to detect with conventional seismic exploration methods. In such cases, faults may only be discernible from seismic events with precise and accurate locations, which generally requires dense seismic monitoring arrays deployed near the stimulated wells. In this study, we introduce a new, semiautomated workflow for processing passive seismic data from a dense array and then integrate it with a 3D seismic dataset to characterize seismicity clusters related to hydraulic fracturing and pre-existing faults. The reactivated faults inferred from the distribution of the microseismic events directly overlie a system of incised, middle Devonian channels below the Duvernay formation observed in time slices extracted from the 3D seismic data. The channel system exhibits a set of lateral offsets, interpreted as ancient strike-slip fault displacements, the detection of which is further enhanced by use of a similarity attribute calculated from the 3D seismic data. Taken together, integrated interpretation of induced seismicity and 3D seismic data support a model of a regional left-lateral strike-slip fault system that was active during the middle Devonian and reactivated in a reverse sense (right-lateral strike slip) during hydraulic-fracturing operations.

A new multi-disciplinary integrated steering technology for horizontal wells in tight sandstone gas reservoirs: A case study of the Ordos Basin

The sandstone layers of the Upper Paleozoic tight clastic gas reservoirs in the Ordos Basin are generally distributed in a pattern of nearly NS strip, and the channel branches and intersects frequently. A single sand body is in a multilayered contact mode resulted from lateral accretion, and the sand bodies at the river intersections present a feature of lying in the nearly EW direction, which brings great difficulties to the geo-steering of horizontal wells. In order to improve the reservoir drilling rate of horizontal wells, this paper systematically analyzed the geo-steering status of horizontal wells and the sedimentary characteristics of reservoirs. Then, the spatial distribution of reservoirs was predicted using 3D geological modeling and 3D seismic. In addition, based on the cognitions on the space distribution of sand bodies from the drilled horizontal wells, the horizontal well geo-steering technology and method were constantly improved and enriched. Thus, an integrated steering technology of “fine sublayer correlation for target entering, geology in small scale, and seismic in large scale” based on in-depth integration of multidisciplinary thinking was newly formed, and it was also applied on site. And the following research results were obtained. First, under the guidance of the sedimentation model, the target entering process is controlled precisely and the success rate of one-trip target entering is improved, so it is one important method for the target steering of deviated hole sections. Second, geological modeling can guide the drilling of horizontal wells, but to some extent, it is deviated from the real underground geologic bodies, so it can be used as an auxiliary horizontal-well steering method. Third, 3D seismic steering can tell the boundary of complex river channel and discriminate the spatial relative location of predominant sand bodies, so it is the primary method for horizontal-well steering to provide excellent judgment and guidance on the steering of horizontal hole sections. Fourth, owing to the application of this new method in 62 horizontal wells drilled in the tight gas demonstration area, the average horizontal section length reaches 1430 m, the average sandstone drilling rate is 86.2%, the average gas layer drilling rate is 70.2%, and the gas layer drilling rate of horizontal wells is increased by more than 10%.

TECHNOLOGY RESTORATION OF THE OPERATIONAL SPO-PROPERTY OF DEFORMED BUILDINGS BY THE MANAGEMENT OF THE SAME-BASE OF THE FOUNDATION BASES

The developed method of restoring deformed and emergency buildings by controlling the foundation stiffness is presented. During the design and construction of buildings and structures, final stabilization deformations of the bases are calculated taking into account the loads, soil characteristics and the corresponding distribution of the base stiffness coefficient under the assumption that the base deformation process is almost completed. But in areas composed of structurally unstable soils, during the operation of structures, changes in the rigidity of the bases are possible due to the negative effect on the properties of the soils. To restore the operational suitability of damaged buildings, a method has been developed for eliminating their deformed state, which is based on the management of the stiffness of the bases. The concept of this method lies in the fact that in case of violation of the design distribution of the base stiffness coefficient, it is necessary to ensure recovery stiffness from the mirrored distribution of the destructive shift coe fficient. On the basis of geodetic survey data of a deformed building, a necessary pattern is determined for changing the foundation stiffness and the plot of the desired sediment of the foundation. The recovery sediments of the foundation provide for the desired epure, corresponding to the "new" distribution of stiffness by perforation of the base layer of limited thickness. Perforation under the foundations carry out the drilling of horizontal wells of the calculated parameters. Under the influence of the weight of the structure and additional technological impact, for example, moistening, the cavities of the wells are deformed, turning from round to ellipsoidal, the pillars of the soil and the arches between the wells are destroyed, filling the deformed cavities, the perforated base layer is compressed. Compression of the layer and sediments of the foundations occur in accordance with the calculated parameters of the wells. As a result, the foundations and, accordingly, the structures are returned to the design (initial) position. Keywords: deformation of objects, restoration of deformed buildings, base stiffness, sediment of foundations, roll removal, base perforation, horizontal well, drilling rig, technological parameters.

Information, robustness, and flexibility to manage uncertainties in petroleum field development

Development decisions for petroleum fields are costly and difficult because they involve long-term projects with complex systems and high level of uncertainties. Decision makers may reduce reservoir uncertainties with the acquisition of additional information or protecting the system against uncertainty with flexibility and robustness. Although often preferred, acquiring additional information may be insufficient to mitigate all uncertainties or may be suboptimal when compared to robustness and flexibility. This study proposes a decision framework to estimate the best approach to manage uncertainty at early stages of field development considering the combination of information, robustness, and flexibility. With a predefined set of uncertain scenarios and specialized production strategies optimized for representative models, we can automate the process. We identify the best way to manage uncertainties by assessing system sensitivity and what controls production strategy selection. We improve the traditional estimation of the expected value of information (EVoI), robustness (EVoR), and flexibility (EVoF), by accounting for all changes in the risk curve and weighing the decision maker's attitude. Our proposal was validated in a controlled environment where the reference response is known (a reference model, called UNISIM-I-R, that is not part of the uncertain ensemble, called UNISIM-I-D). The best approach to manage uncertainty in UNISIM-I-D combined features of robust and specialized strategies, resulting in a flexible strategy with robustness. This solution increased oil recovery and the economic return in UNISIM-I-R when compared to taking no action to manage uncertainty, but was suboptimal. These results agree with the rationale behind investing in actions to manage uncertainty (such as flexible and robust strategies), which is to mitigate risks or exploit upsides of uncertainty (i.e., they are intended to prevent or explore extreme outcomes). Investing in such actions is a risky decision in itself because they may not be needed, depending on the features of the real reservoir. Our results in UNISIM-I-D demonstrate the EVoI, EVoR, and EVoF are not additive. Our results in UNISIM-I-R reveal that inherent flexibility in operations (such as in drilling of horizontal wells) may mitigate some risks, reducing the EVoI, EVoR, and EVoF. Our proposal is a good starting point for more quantitative and objective decision-making at the early stages of field development and ultimately prevents discarding attractive solutions based on biases or insufficient metrics. Some improvements may be necessary for EVoI, EVoR, and EVoF estimates depending on the stage of the lifetime of the field, among other factors.

Geo-steering technology for horizontal wells in deep karst Dengying reservoirs of the Gaoshiti gas field, Central Sichuan Basin

The Upper Sinian Dengying formation in the Gaoshiti gas field, Central Sichuan Basin, has always been the major payzone of natural gas exploration and development in this basin up till now. But due to the complexity of siliceous and heterogeneous reservoirs there such as high temperature, high pressure, high H2S content, well-developed pores and fractures, frequent sticking and leakage often occur along with high risks of blowout during horizontal-well drilling, which even makes geo-steering, and reservoir tracing and orientation difficult. In view of this, based on the analysis of geological and drilling characteristics of Dengying reservoirs and the summary of actual drilling data, we put forward a geological modeling technology for multi-well lithofacies interpretation and reservoir comparative analysis, fracture-cavity detection through comprehensive logging, geology and seismic data; then bycombining the real-time geo-steering technology of reservoir identification with evaluation with LWD data, reservoir seismic model and cutting element analysis, we focused on the optimization of such aspects as the inclination angle at the top of Dengying Fm, the trajectory plan for the build-up section, the suitable string and the directional operation scheme, and the well trajectory technology for avoiding siliceous and tight layers, and finally formed an integrated geo-steering technology suitable for the geological and engineering characteristics of the Dengying reservoirs. The field practices of five wells show that this presented method is worth popularizing in that the drilling goal with geological guidance has been achieved; that effective reservoir drilling rate and drilling efficiency have been increased; that operation risks have been reduced; and that the needs of geological guidance under complex geological and borehole engineering conditions in this area have been met.

ОПЫТ РАЗРАБОТКИ МЕСТОРОЖДЕНИЙ ПЕРМСКОГО КРАЯ ГОРИЗОНТАЛЬНЫМИ СКВАЖИНАМИ

Hydrocarbon reservoir engineering has a top priority to achieve the highest possible value of the cost-effective oilrecovery factor. Structural deterioration of residual oil reserves and inevitable development of hard-to-recover reservesrequire new effective technologies and engineering solutions. Today, there is a tendency to replace the standard sizewell drilling technologies (including vertical, directional, horizontal, multilateral wells) and standard size dualcompletion equipment usage by slim-hole drilling technologies. In Perm Krai fields, more than 385 horizontal wellshave been drilled, while 3.4 % of them, i.e. 13 wells, have a small diameter. The conducted well operation analysisshows that the effectiveness of the horizontal well operations in a number of instances is significantly lower than thepotential one. This leads to a deteriorated economic performance of reservoir developments, and, eventually, to assetvalue reductions. Perhaps, the main reason of low effectiveness of the horizontal well operations lies is an insufficientunderstanding of geological and physical conditions of their successful operations. It has become obvious that drillinghorizontal wells in reservoirs with high compartmentalization, low net oil thickness, and decreased hydrodynamicconnectivity to the edge water zone offer a low level of performance. Productivity tends to decrease to average outputvalues of directional wells. Therefore, the problem of choosing a well design and its direction in specific geological andphysical conditions is highly relevant.

Numerical simulation and dimension reduction analysis of electromagnetic logging while drilling of horizontal wells in complex structures

Electromagnetic logging while drilling (LWD) is one of the key technologies of the geosteering and formation evaluation for high-angle and horizontal wells. In this paper, we solve the dipole source-generated magnetic/electric fields in 2D formations efficiently by the 2.5D finite difference method. Particularly, by leveraging the field’s rapid attenuation in spectral domain, we propose truncated Gauss–Hermite quadrature, which is several tens of times faster than traditional inverse fast Fourier transform. By applying the algorithm to the LWD modeling under complex formations, e.g., folds, fault and sandstone pinch-outs, we analyze the feasibility of the dimension reduction from 2D to 1D. For the formations with smooth lateral changes, like folds, the simplified 1D model’s results agree well with the true responses, which indicate that the 1D simplification with sliding window is feasible. However, for the formation structures with drastic rock properties changes and sharp boundaries, for instance, faults and sandstone pinch-outs, the simplified 1D model will lead to large errors and, therefore, 2.5D algorithms should be applied to ensure the accuracy.

Application of Composite Deflecting Model in Horizontal Well Drilling

Based on current issues of difficulties in controlling horizontal well trajectory and high cost in drilling deflecting, a compound deflecting BHA (bottom hole assembly) with diameter-adjustable stabilizer (DAS) and bending-adjustable housing (BAH) is presented. According to the DAS operational principles and the stress condition in operation, the computational formula of wedge’s axial moving displacement and piston’s radial telescopic displacement of the DAS driven by drilling fluid pressure is presented. This formula is verified by lab experimental simulation. Three-points-circle method is utilized to calculate geometrical build up rate of compound deflecting BHA, and the result is verified by field data. The method is utilized to make design and calculate for compound BHA. The research can be used as a reference for compound deflecting drilling in horizontal wells. The flow rate and pressure difference have a very serious impact on the flow regulator erosion, so the flow rate and pressure difference should be controlled when the DAS works, and it is suggested that the flow regulator should maintain and replace frequently when in service.

The Rule of Carrying Cuttings in Horizontal Well Drilling of Marine Natural Gas Hydrate

Horizontal well drilling is a highly effective way to develop marine gas hydrate. During the drilling of horizontal wells in the marine gas hydrate layer, hydrate particles and cutting particles will migrate with the drilling fluid in the horizontal annulus. The gravity of cuttings is easy to deposit in the horizontal section, leading to the accumulation of cuttings. Then, a cuttings bed will be formed, which is not beneficial to bring up cuttings and results in the decrease of wellbore purification ability. Then the extended capability of the horizontal well will be restricted and the friction torque of the drilling tool will increase, which may cause blockage of the wellbore in severe cases. Therefore, this paper establishes geometric models of different hole enlargement ways: right-angle expansion, 45-degree angle expansion, and arc expanding. The critical velocity of carrying rock plates are obtained by EDEM and FLUENT coupling simulation in different hydrate abundance, different hydrate-cuttings particle sizes and different drilling fluid density. Then, the effects of hole enlargement way, particle size, hydrate abundance and drilling fluid density on rock carrying capacity are analyzed by utilizing an orthogonal test method. Simulation results show that: the critical flow velocity required for carrying cuttings increases with the increase of the particle size of the hydrate-cuttings particle when the hydrate abundance is constant. The critical flow velocity decreases with the increase of drilling fluid density, the critical flow velocity carrying cuttings decreases with the increase of hydrate abundance when the density of the drilling fluid is constant. Orthogonal test method was used to evaluate the influence of various factors on rock carrying capacity: hydrate-cuttings particle size > hole enlargement way > hydrate abundance > drilling fluid density. This study provides an early technical support for the construction parameter optimization and well safety control of horizontal well exploitation models in a marine natural gas hydrate reservoir.

Prediction of Cuttings Transport Behavior under Drill String Rotation Conditions in High-Inclination Section

Cuttings are likely to accumulate and eventually form a cuttings bed in the highly-deviated section, which usually lead to high friction and torque, slower rate of penetration, pipe stuck and other problems. It is therefore necessary to study cuttings transport mechanism and improve hole cleaning efficiency. In this study, the cuttings-transport behaviors with pipe rotation under turbulent flow conditions in the highly deviated eccentric section were numerically simulated based on Euler solid–fluid model and Realizable [Formula: see text]–[Formula: see text] model. The resulted numerical results were compared with available experimental data in reported literature to validate the algorithm, and good agreement was found. Under the conditions of drill string rotation, cuttings bed surface tilts in the direction of rotation and distributes asymmetrically in annulus. Drill string rotation, drilling fluid flow rate, cuttings diameter, cuttings injection concentration and drilling fluid viscosity affect the axial velocity of drilling fluid; whereas drilling fluid tangential velocity is mainly controlled by the rotational speed of drill string. Increase in value of drill string rotation, drilling fluid flow rate or hole inclination will increase cuttings migration velocity. Notably, drill string rotation reduces cuttings concentration and solid–fluid pressure loss, and their variations are dependent on inclination, cuttings injection concentration, cuttings diameter, drilling fluid velocity and viscosity. However, when a critical rotation speed is reached, no additional contribution is observed. The results can provide theoretical support for optimizing hole cleaning and realizing safety drilling of horizontal wells and extended reach wells.

DEVELOPMENT OF MULTI-STAGE FRACTURING TECHNOLOGIES

Background Due to the increasing share of hard-to-recover oil reserves, systems for well completion and intensification of fluid inflows are being improved. One of the most effective methods for producing hard-to-recover reserves is the drilling of horizontal wells with multi-stage hydraulic fracturing. This article is devoted to well completion technology with using controlled frac sleeves, which are controlled by the SandHawk tool on coil tubing. The article describes a Various types of frac sleeves, downhole drill stem assembly for preparing the well, for open and close ports by the SandHawk. Aims and Objectives Analysis the development of multi-stage fracturing and study the SandHawk tool for multi-stage fracturing in wells with a horizontal section at the Priobskoye field. Results The analysis of development and improvement of technologies for secondary drilling in wells with a horizontal section at the Priobskoye field was carried out.

INVESTIGATION OF THE STABILITY OF THE WALLS OF HORIZONTAL WELLS

In presented work determine the dependence of the allowable wellhead pressure during the drilling of horizontal wells on the depth of drilling and the mechanical properties of the rocks, which ensures the stability of the walls of the wells and the circulation of the drilling fluid

INVESTIGATION OF THE STABILITY OF THE WALLS OF HORIZONTAL WELLS

In presented work determine the dependence of the allowable wellhead pressure during the drilling of horizontal wells on the depth of drilling and the mechanical properties of the rocks, which ensures the stability of the walls of the wells and the circulation of the drilling fluid.

Efficiency Analysis of the Geological-Technical Activities in Severo-Ostrovnoe Field

The work is devoted to identifying the most relevant geological and technical measures carried out in Severo-Ostrovnoe field from the period of its development to the present. Every year dozens of geotechnical jobs (GJ) are carried out at each oil field-works carried out at wells to regulate the development of fields and maintain target levels of oil production. Today, there are two production facilities in the development of the Severo-Ostrovnoe field: UV1a1 and BV5. With the help of geotechnical jobs, oil-producing enterprises ensure the fulfillment of project indicators of field development (Mikhailov, N.N., 1992. Residual Oil Saturation of Reservoirs Under Development. Moscow, Nedra. p.270; Good, N.S., 1970. Study of the Physical Properties of Porous Media. Moscow, Nedra. p.208). In total, during the development of the Severo-Ostrovnoe field, 76 measures were taken to intensify oil production and enhance oil recovery. 12 horizontal wells were drilled (HW with multistage fracking (MSF)), 46 hydraulic fracturing operations were performed, 12 hydraulic fracturing operations were performed at the time of withdrawal from drilling (HW with MSF), five sidetracks were cut; eight physic-chemical BHT at production wells; five optimization of well operation modes. The paper analyzes the performed geological and technical measures at the facilities: UV1a1∦BV5 of the Severo-Ostrovnoe field. Four types of geological and technical measures were investigated: hydraulic fracturing, drilling of sidetracks with hydraulic fracturing, drilling of horizontal wells with multi-stage hydraulic fracturing, and physic-chemical optimization of the bottom-hole formation zone. It was revealed that two geotechnical jobs, namely, formation hydraulic fracturing (FHF) and drilling of lateral shafts in the Severo-Ostrovnoe field are the most highly effective methods for intensifying reservoir development and increasing oil recovery. SXL was conducted at 5 wells. The average oil production rate is 26.6 tons per day, which is the best indicator. Before this event, the production rate of the well was 2.1 tons per day. Currently, the effect of ongoing activities continues.