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Concentric double-pipe under-pressure operation water injection packer

A technology with pressurized operation and concentric double pipes, which is applied in the direction of sealing/isolation, production fluid, wellbore/well components, etc., can solve the problems of high setting pressure, damaged inner tubing, easy to lose seal, etc., and achieve the goal of setting Low pressure, avoid resistance, ensure long-term effective sealing effect

Pending Publication Date: 2020-11-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a concentric double-pipe hot water injection packer for hot water injection wells. Note, the problem of easy loss of seal during well flushing

Method used

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  • Concentric double-pipe under-pressure operation water injection packer

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Embodiment Construction

[0024] The present invention is described in further detail below in conjunction with accompanying drawing:

[0025] see figure 1 , a concentric double-tube water injection packer under pressure, including an upper joint 1, a retaining ring 2, an unsealing pin 3, a balance piston 4, a retaining ring 5, a backwash valve 6, a backwash inlet 7, and an upper cylinder liner 8 , L-shaped gasket 9, gland 10, rubber tube outer tube 11, end rubber tube 12, spacer ring 13, middle rubber tube 14, inner tube 15, split wrist guard 16, adjustment ring 17, backwash outlet 18 , lock sleeve 19, split lock claw 20, cone ring 21, inverted tooth buckle 22, setting pin 23, upper piston 24, upper central tube 25, middle piston 26, lower central tube 27, lower piston 28, lower joint 29 , anti-blocking pin 30, pin seat 31.

[0026] The L-shaped sealing gasket 9 is put into the gland 10, and the gland 10 is connected with the upper end of the outer tube 11 of the rubber tube by a screw, and the end ...

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Abstract

The invention discloses a concentric double-pipe under-pressure operation water injection packer. The concentric double-pipe under-pressure operation water injection packer is used for double-pipe under-pressure operation separate injection, is provided with a three-stage setting piston, reduces the setting force, and can realize reliable setting of the packer in a well with higher formation pressure and lower pressure level of a wellhead device; meanwhile, after a setting pin is cut off, the three-stage setting piston is disconnected with a lock sleeve, and when injection is stopped or a wellis washed, the three-stage setting piston resets and cannot generate tensile force on the lock sleeve, so that the packer is prevented from being unsealed in advance, and long-term effective sealingof the packer is guaranteed; and the inner drift diameter of the packer is large and is equal to that of an oil pipe with the drift diameter of 73 mm, and a concentric double-pipe separate injection inner pipe can be prevented from being blocked.

Description

technical field [0001] The invention belongs to the technical field of oil field downhole operation equipment, and in particular relates to a water injection packer for concentric double-pipe pressure operation. Background technique [0002] After the water injection development of ultra-low permeability reservoirs, the downhole formation has a high backflow pressure, which requires long-term depressurization or well killing operations before construction operations can be carried out. However, long-term pressure release will increase the construction period, waste the injected energy, and at the same time, the large change in pressure difference will damage the casing and pollute the ground. If the high-density well killing hydraulic well is adopted, the construction cost is high, and it is easy to cause pollution to the formation, and the formation will be crushed to death. Therefore, the operation of water injection wells in ultra-low permeability reservoirs often adopts...

Claims

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Application Information

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IPC IPC(8): E21B43/20E21B33/126E21B21/10
CPCE21B43/20E21B33/126E21B21/10
Inventor 申晓莉薛建强王守虎王俊涛何汝贤王薇王晓娥陈立海
Owner PETROCHINA CO LTD
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