Abstract
The hydraulic jet radial drilling technology is a low-cost production and completion technology for effectively developing low-permeability marginal reservoirs, thin-bed reservoirs with edge and bottom water, and depleted oil and gas fields. It has been successfully and widely applied in sandstone, coalbed methane, and heavy oil reservoirs. In order to explore its application in carbonate reservoirs, specially economically and efficiently develop low-permeability thin-layer carbonate reservoirs, the pilot of hydraulic jet radial drilling technology in the carbonate reservoir application was successfully completed through the research on the principle, advantage, existing problems and application condition of radial jet drilling, economic productivity was got, and cost-effective development was achieved, this pilot provided a method for the development of low permeability thin layer carbonate reservoir. This research shows that the hydraulic jet radial drilling technology has its unique technical advantages, which can enable some reservoirs to increase production or injection, but it is not suitable for every well, it has certain applicable conditions, such as the depth, thickness, and temperature of the target zone, and the conditions of well inclination, casing and wellbore have certain requirements too. The hydraulic jet radial drilling technology can achieve the expected target based on the zone and well selection, in selecting layers, as far as possible, homogeneous oil layers with good reservoir physical properties should be selected; the key of its successful implementation is the depth and azimuth control, wellbore diameter and operation safety control. The application of hydraulic jet radial drilling in carbonate reservoirs will make the spray hose wear large due to its high Young's modulus the high hardness, which affects the treatment footage; the use of acid in jet drilling can increase the radial drilling footage, but on the other hand can also produce impurities affecting the operation. The working fluid for jetting must meet the requirements of no solid phase.
Highlights
Radial drilling technology is a drilling technology that uses high-pressure water jet to drill multiple radial horizontal branch boreholes in one or multiple layers of a reservoir, which is a completion and stimulation technology for oil and gas fields [1,2]. This technology can effectively prevent water cones and gas cones. It can be used both for the development of new drilled wells and for the stimulation of old wells, and is favorable for the stimulation of thin layer reservoirs, low-permeability oil and gas reservoirs and coal bed methane, and is an effective means for water well stimulation as well
The 12 days operation completed six radial drilling 30-40mm diameter boreholes with single-hole footage of 45-56m, an average footage of 50.5m
(2) The liquid purity and the ground liquid filtration system did not meet the requirement, and the diameter of the nozzle is only 0.7mm, the nozzle was likely to be blocked at high pressure for a long time, making the jet drilling failed to move in a straight line
Summary
Radial drilling technology is a drilling technology that uses high-pressure water jet to drill multiple radial horizontal branch boreholes in one or multiple layers of a reservoir, which is a completion and stimulation technology for oil and gas fields [1,2]. This technology can effectively prevent water cones and gas cones. Before radial drilling, casing milling and borehole reaming were needed [5,6] Companies such as RDS Company, Blast Company, and WES Company have developed new radial drilling technology. Field tests on radial drilling technology were conducted in Liaohe Oilfield, Shengli Oilfield, Nanyang
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