Abstract
Combination of hydrodynamic impact on the formation with acid treatment may be seen as a promising direction in the field of well development and repair in complex geological conditions. With multiple repetition of hydraulic shocks in conjunction with the injection of acid solution, the depth and opening of cracks gradually increases, which contributes to a deeper penetration of the acid solution into the reservoir. The article presents analytical studies, which are aimed at determining the effectiveness of applying the technology of hydrodynamic impact on the bottomhole zone of an oil reservoir when using two fluids with different viscoelastic characteristics as a working fluid. They are devoted to determining the pressure drop at the borehole bottom depending on the initial applied pressure at the wellhead, the velocity of the shock wave, the viscosity of the working and well fluid, and their quantity. These studies were based on the well-known models of Thomson – Tаt and Maxwell, considering viscous liquid flow. The dependence obtained proves that with an increase in the pressure pulse generated at the wellhead, the development of pressure pulses at the borehole bottom is a power-law dependence, and with significant volumes of fluid in contact with the bottomhole formation zone, the pressure drop generated at the borehole bottom does not depend only on pressure pulses generated at the wellhead, but also on the dynamic viscosity of this fluid. Conducted studies have shown the effectiveness of hydrodynamic impact technology application when using two liquids with different viscoelastic characteristics and obtaining a synergistic effect during the development and repair of wells in low-permeable reservoirs. Analytical studies were based on data from previously conducted experimental industrial tests on the operating injection well.
Highlights
Nowadays, many of the world’s oil and gas fields are in the process of falling production or are classified as deposits with hard-to-recover reserves or with complex structured reservoirs
Combination of hydrodynamic impact on the formation with acid treatment may be seen as a promising direction in the field of well development and repair in complex geological conditions
The article presents analytical studies, which are aimed at determining the effectiveness of applying the technology of hydrodynamic impact on the bottomhole zone of an oil reservoir when using two fluids with different viscoelastic characteristics as a working fluid
Summary
Many of the world’s oil and gas fields are in the process of falling production or are classified as deposits with hard-to-recover reserves or with complex structured reservoirs. The main volume of production falls on the fields commissioned in the XX century, where an intensive extraction of fluid was observed, leading to a violation of optimal operating conditions, high water content of the production and significant contamination of the bottomhole zones of producing and injection wells. This forces specialists in the oil and gas industry to develop new energy efficient [2,3,4] and highly profitable technologies capable of ensuring stable maintenance and growth of hydrocarbon production in complex geo-logical conditions [5, 6]. Considering the equivalent production, putting idle non-profit wells into operation can have a significant impact on the efficiency of the oil industry performance
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