Hydraulic control type tubular column salvage reinforcement system

Abstract

The invention discloses a hydraulic control type tubular column salvage reinforcement system. The system is formed by sequentially connecting an anchor, a booster and a reversing valve from top to bottom; the booster is composed of a hydraulic cylinder structure assembly, an upper connector assembly and a lower connector assembly; the anchor comprises an anchor upper connector, a center shaft, an anchor tooth block, an anchor tooth base, a tooth base frame, a piston sleeve and a hydraulic cylinder sleeve; and the booster and the anchor are both of a slurry liquid flow pressure driving structure, so that integration is reasonable, the structure is compact, operation is convenient, and running is reliable. The booster forms a multi-stage hydraulic cylinder by utilizing an integrated piston rod and an integrated hydraulic cylinder; under the control of liquid flow pressure, continuous periodic interactive conversion of an integrated hydraulic cylinder sleeve force increasing drawing and integrated piston rod lifting reset working state is achieved; the anchor is matched with dynamic anchoring through the hydraulic cylinder composed of the piston sleeve and the hydraulic cylinder sleeve and a periodic change working state of the booster, so that the fishing efficiency and the fishing effect can be improved; and meanwhile, the system can be respectively matched with the rotary type reversing valve and a lifting type reversing valve, so that the application range is wide, and production requirements are fully met.

Description

technical field [0001] The invention relates to a salvage booster system, in particular to a hydraulic-controlled pipe string salvage booster system. Background technique [0002] In the production of offshore oilfields, some low-yield oil wells must be re-injected in the middle and late stages of production, that is, these oil wells are converted from crude oil production wells to water or polymer injection wells, so as to optimize the well pattern layout and improve oil production efficiency. However, some After a period of water injection or polymer injection profile control in the transfer oil well, a large amount of scale, corrosion and their aggregation products will be produced and accumulated in the downhole split injection string, which will lead to blockage of the well string, and the well needs to be replaced in time during production. tubing string. At present, due to the constraints of the special offshore oil production environment and the specific structure a...

AI Technical Summary

Problems solved by technology

[0002] In the production of offshore oilfields, some low-yield oil wells must be re-injected in the middle and late stages of production, that is, these oil wells are converted from crude oil production wells to water or polymer injection wells, so as to optimize the well pattern layout and improve oil production efficiency. However, some After a period of water injection or polymer injection profile control in the transfer oil well, a large amount of scale, corrosion and their aggregation products will be produced and accumulated in the downhole split injection string, which will lead to blockage of the well string, and the well needs to be replaced in time during production. String

At present, due to the constraints of the special offshore oil production environment and the specific structure and function of the offshore oil production platform, the rated load and ultimate load of the workover devices configured on the oil production platform are generally relatively low, and the oil and gas wells in offshore oil fields are distributed in clusters Wells, including directional wells, extended-reach wells, and horizontal wells, etc., when the wellhead is pulled vigorously for fishing, the multi-point contact between the fishing string and the inner wall of the casing has a great friction effect, and these frictional resistances react on the fishing string. The existing matching workover device sometimes cannot directly complete the salvage and lifting by routine operation, the effect of the undercut operation is poor, and the success rate of salvage or jam release is low. Limiting the application of the salvage jar's vigorous upstroke operation method, there are problems of low efficiency and poor effect in the replacement and salvage of offshore oilfield well pipe strings, which has become an obvious restrictive technical link in offshore oilfield production. Therefore, it is necessary to research and develop Auxiliary booster system and supporting devices for offshore oilfield string replacement and salvage, and can be popularized and applied in workover operations in land oilfields to assist in salvage and catch, improve fishing efficiency and effect, and meet oilfield production needs

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