A Downhole Pulse Generation Device and Injection Method Driven by Tubing Transmission

Abstract

The invention discloses a downhole pulse generating device driven by oil pipe transmission and an injection method, which belong to the technical field of oilfield development engineering and mainly include oil pipe, oil pipe anchor, hydraulic pulse generator, backwash well valve, and fluid in the hydraulic pulse generator The internal energy is stored and the pressure is boosted, and the high-pressure fluid is ejected in the form of pulses according to a certain frequency. Its pulse generating device is different from conventional hydraulic piston type generating device or electromagnetic valve device. The injection method includes: well selection of injection wells; setting of the start-up pressure value and pulse frequency of the pulse generating device, setting of the number of hydraulic pulse generators; installation of tubing and downhole tools; use of pulse wave injection to drive oil; backwashing the well. The invention is easy to install and has a simple process, and is suitable for the injection of vertical wells, inclined wells, directional wells and horizontal wells, and uses a hydraulic pulse device to provide a pulse wave with a stable frequency for the downhole oil layer. While improving the permeability near the bottom of the well, it can also Reduce residual oil saturation and greatly increase oil recovery.

Description

technical field [0001] The invention relates to a downhole pulse generating device driven by oil pipe transmission and an injection method, belonging to the technical field of oil field development engineering. Background technique [0002] In the past ten years, the research and application of hydraulic pulse water injection technology at home and abroad have progressed rapidly, and a series of supporting equipment and technology have been formed. The pulse generator is mainly designed with a piston structure or a solenoid valve control structure. In the actual use process Among them, the existing devices are usually greatly affected by the salinity of the injected water, mechanical impurities, scaling, etc., the working state is unstable, the life is short, the failure rate is high, or the cable is required to supply power to the underground system, the construction process is complicated, and it cannot be under pressure. Obvious defects and deficiencies such as operation ...

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Problems solved by technology

[0002] In the past ten years, the research and application of hydraulic pulse water injection technology at home and abroad have progressed rapidly, and a series of supporting equipment and technology have been formed. The pulse generator is mainly designed with a piston structure or a solenoid valve control structure. In the actual use process Among them, the existing devices are usually greatly affected by the salinity of the injected water, mechanical impurities, scaling, etc., the working state is unstable, the life is short, the failure rate is high, or the cable is required to supply power to the underground system, the construction process is complicated, and it cannot be under pressure. Obvious defects and deficiencies such as operation and adapting to small well deviation, the application range is narrow, which limits the further popularization and application of hydraulic pulse technology

[0003] The device described in the Chinese patent document (publication number CN104929605A) includes a hydraulic pulse fracturing device. Its structure is a piston structure, and its working principle is to control the opening and closing of the nozzle through the pressure difference between the hydraulic force and the spring force. Then the pulse is excited. Due to the complex downhole environment such as fracturing sand, machine impurities, and scaling in the downhole liquid environment, the reciprocating motion of the piston itself and the sealing method are tangential structures, and the sealing method is also a rubber "0" ring seal. , prone to failure and low reliability, not suitable for long-term work in complex underground environments; at the same time relying on spring force excitation, the piston is always in the open state due to high ground pressure and cannot be reset, and loses the function of exciting pulses. The pulse frequency of this method Unstable and difficult to control, and this process is used for fracturing, cannot realize backwash well, and cannot be used in acidizing and water injection processes

[0004] At present, with the deepening of oilfield development, the demand for technologies such as wave chemical assisted production and injection, wave acidizing and plugging removal is becoming more and more urgent, and the well types (inclined wells, directional wells, horizontal wells, etc.) required to be adapted are becoming more and more complex , it is necessary to design injection devices corresponding to different well types, which has small adaptability and high investment cost

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