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Cement sheath eccentric rolling extrusion crushing tool for long-service-life auxiliary sleeve recovery

A technology of extrusion and crushing and cement sheath, which is applied in wellbore/well components, earth-moving drilling, etc., can solve the problem of increasing the abandonment operation cycle and cost, unfavorable smooth casing recovery operation, and increasing casing pulling resistance, etc. problems, to achieve the effect of easy procurement, maintenance and replacement, shortening the recycling operation cycle, and reducing the resistance of the casing

Active Publication Date: 2022-08-09
四川中能数智科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The development of oil and gas wells is in the middle and later stages, oil and gas resources are gradually exhausted, and a large number of oil and gas wells are permanently abandoned. When using underwater wellhead devices, permanent well abandonment operations should be carried out in accordance with industry requirements. Temporary well abandonment and exploration wells must be permanently abandoned. The number of oil and gas wells to be abandoned is increasing year by year. The "GB2019 Oil and Gas Drilling Marine Abandonment Operation Regulations" requires that the abandonment operation should select an appropriate well depth, cut and salvage the casing from the inside to the outside, and then use cement Permanent plugging, the purpose is to realize the isolation of oil and gas, and prevent the leakage of residual oil and gas from causing marine ecological pollution and damage. This greatly increases the resistance to pulling out the casing, making it difficult or even impossible to pull out the casing from the wellbore. Cutting a small section of casing first and then pulling it out successively will increase the chance of abandoning the well. Operation cycle and cost. In short, the traditional method of recovering casing in well abandonment operation is far from meeting the market demand of well abandonment operation. It is necessary to develop new technologies based on innovative means to improve it
[0003] Publication number CN112610177A, the Chinese patent dated April 6, 2021 discloses an extrusion device and extrusion operation method for recovery of abandoned well casings. The "extrusion ring" of the patent follows the "core column" Rotate together, its "core column" is severely worn during use due to direct frictional contact with the casing, and the loss of parts is accelerated, and one end of its "extrusion block" directly bears all axial tension during eccentric extrusion operations , which will cause it to be easily deformed, which will lead to seal failure and reduce the service life of the entire tool, which is not conducive to the smooth progress of casing recovery operations

Method used

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  • Cement sheath eccentric rolling extrusion crushing tool for long-service-life auxiliary sleeve recovery
  • Cement sheath eccentric rolling extrusion crushing tool for long-service-life auxiliary sleeve recovery
  • Cement sheath eccentric rolling extrusion crushing tool for long-service-life auxiliary sleeve recovery

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Embodiment

[0032] A cement ring eccentric rolling extrusion crushing tool for auxiliary casing recovery with high life, such as Figure 1 to Figure 6 As shown, it includes main shaft 1, upper roller 4, movable roller 12, lower roller 23, moment ferrule 13, thrust bearing A2, thrust bearing B15, thrust bearing C26, radial bearing A7, radial bearing B16, radial bearing C27 , the piston 14, the centralizer 17, the lower joint 29, the movable roller 12 is installed on the main shaft 1 through the thrust bearing B15, the radial bearing B16 and the moment ferrule 13 and under the action of the centralizer 17, and the movable roller 12 is located on the upper roller 4 Between the main shaft 1 and the lower roller 23, the upper roller 4 and the lower roller 23 are installed through the thrust bearing and the radial bearing, the lower joint 29 is installed on the bottom of the main shaft 1 using a threaded connection, and a cylindrical water nozzle 32 is opened inside the lower joint 29. , by adj...

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Abstract

A long-service-life cement sheath eccentric rolling extrusion crushing tool assisting in casing recycling comprises a main shaft, an upper roller, a piston, a torque clamping sleeve, a movable roller, a lower roller, bearings, a centralizer and a lower connector, the movable roller is installed on the main shaft through the two sets of bearings and the torque clamping sleeve under the action of the centralizer, and the movable roller is located between the upper roller and the lower roller; an upper roller and a lower roller are mounted on the main shaft through two groups of bearings, a lower joint is mounted at the bottom of the main shaft in a threaded connection manner, a cylindrical water nozzle is formed in the lower joint, the internal throttling pressure difference of the tool can be controlled by adjusting the diameter of the cylindrical water nozzle, the total lateral thrust of a piston is controlled, and the movable roller'rolls' a sleeve in a rolling contact manner; the process is similar to the road surface rolled by automobile wheels, the radial damage width of the damage of the cement sheath is gradually increased under the upward pulling action of a drilling machine until the whole expected underground well cementation cement is completely damaged, and the method has positive reference and popularization value for improving the casing recovery operation mode.

Description

technical field [0001] The invention relates to an eccentric rolling extrusion and crushing tool of a cement sheath for auxiliary casing recovery with long life, belonging to the technical field of abandoned well casing recovery operation. Background technique [0002] The development of oil and gas wells has entered the middle and late stage, the oil and gas resources are gradually exhausted, and a large number of oil and gas wells have been permanently abandoned. The number of oil and gas wells that need to be abandoned is increasing year by year. The "GB2019 Oil and Gas Drilling Ocean Abandoning Operation Regulations" requires that the appropriate well depth should be selected for the abandonment operation, and the casing should be cut and recovered from the inner layer to the outer layer. The purpose of permanent plugging is to realize the isolation of oil and gas and prevent the leakage of residual oil and gas from causing marine ecological pollution and damage. This g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/00
CPCE21B29/00
Inventor 王国荣张林锋陈明付钟林薛成刚敬佳佳胡刚刘小平王党飞曾秦涛冯清
Owner 四川中能数智科技发展有限公司
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