Deblocking water-swellable packer

A water-swelling and water-swelling rubber technology, which is applied in the directions of sealing/packing, wellbore/well parts, earthwork drilling and production, etc., can solve the problems of easily damaged oil well casing, solidified structure damage, wear of the well wall or Problems such as casing, to avoid poor sealing, eliminate suction effect, and enhance the effect of sealing

Active Publication Date: 2018-02-23
DONGYING YUANJIE PETROLEUM MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is: because there is always an oil-water mixture downhole, the packer is always in a state of expansion
However, when workover is required, the entire pipe string needs to be taken out, and the original water-swellable packer has a large resistance and cannot be pulled out because it is always in an inflated state; The suction effect of the packer is too destructive to the formation, and even the original solidification structure of the crosslinking agent, curing agent, acidifying agent and sand injected into the formation before is destroyed, seriously causing waste of the oil well. Well; Another way is to grind and mill the packer through grinding shoes, which has the problems of high cost, lo

Method used

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  • Deblocking water-swellable packer
  • Deblocking water-swellable packer
  • Deblocking water-swellable packer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, with reference to attached figure 1 and 4 , 5, a kind of unsealing type water-swellable packer mentioned in the present invention, its technical scheme is: comprise upper joint 1, water-swellable rubber 2, upper retaining ring 3, unsealing liner 4, upper unsealing Sealing scissors 5, lower unsealing scissors 6, lower retaining ring 7, lower joint 8, upper central tube 9, lower central tube 10, the upper central tube 9 and lower central tube 10 are movably connected by unsealing liner 4 , and the middle part of the unsealing liner 4 fixes the upper central pipe 9 through the upper unsealing shear nail 5, fixes the lower central pipe 10 through the lower unsealing shear nail 6, and fixes the upper stop on the outer wall of the middle part of the upper central pipe 9 Ring 3, the outer end of the upper central tube 9 is provided with an upper joint 1, the lower retaining ring 7 is fixed on the outer wall of the middle part of the lower central tube 10, and th...

Embodiment 2

[0038] Embodiment 2, with reference to attached Figure 5 , the outer edge of the upper shoulder 11 of the present invention is provided with a protruding outer steel ring 15, which is used to firmly cooperate with the upper unblocking retaining ring 12, and the outer edge of the lower shoulder 14 is provided with a protruding outer steel ring 15, used to firmly cooperate with the lower unblocking retaining ring 13; the outer edges of the above-mentioned upper unblocking retaining ring 12 and the lower unsealing retaining ring 13 are respectively provided with raised inner steel rings 16, such a structure can better Ensure the reliability of the connection between the unsealing liner and the upper and lower center pipes, and avoid unsealing failure caused by falling off.

Embodiment 3

[0039] Example 3, the cavities of the upper and lower retaining rings of the present invention are filled with water-absorbing resin, and the cross-section of the upper and lower retaining rings is an isosceles triangle. Extruded to form the bulge 17, this structure can also achieve the purpose of the present invention, enhance the sealing performance of the water-swellable rubber, and avoid the problem of poor sealing caused by uneven expansion.

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Abstract

The invention relates to a deblocking water-swellable packer. The technical scheme of the deblocking water-swellable packer is that an upper center pipe and a lower center pipe are movably connected through a deblocking liner pipe, the upper center pipe is fixed to the middle of the deblocking liner pipe through an upper deblocking shear pin, the lower center pipe is fixed through a lower deblocking shear pin, an upper blocking ring is fixed to the outer wall of the middle of the upper center pipe, the outer end of the upper center pipe is provided with an upper connector, a lower blocking ring is fixed to the outer wall of the middle of the lower center pipe, and the outer end of the lower center pipe is provided with a lower connector. Water-swellable rubber is processed on the outer wall. The deblocking water-swellable packer has the advantages that by design of the deblocking structure, contraction of the water-swellable rubber can be achieved, deblocking is achieved, the conditions of failure in pulling caused by high resistance of the water-swellable rubber during well repair can be avoided, a huge collapsing force on a stratum caused by a suction effect of the packer when atensile force is reinforced in a forced mode for pulling is also avoided, and the problems of high cost and long operation cycle caused by milling operation through milling shoes are also solved.

Description

technical field [0001] The invention relates to an oil well operation tool and method, in particular to an unsealable water-swellable packer. Background technique [0002] The packer is a special tool for downhole stratified isolation composed of steel body, packer and control part, which is used in the petroleum industry to meet the technical purpose of oil and water wells or the technical measures of oil layers. Oil production, water injection and reservoir stimulation all require corresponding types of packers. Including self-sealing, expanding, compressing and combined structures, their application fields are different. When encountering open hole wells and oil wells with damaged casings, the above four packers are used to seal through mechanical or hydraulic sealing. If the sealing effect cannot be achieved, the water-swellable packer developed in recent years can be used. At present, the existing water-swellable packers are generally used in multi-layered formations ...

Claims

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Application Information

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IPC IPC(8): E21B33/127
CPCE21B33/1277
Inventor 李明熊珂英张子鹏李波张兆杰
Owner DONGYING YUANJIE PETROLEUM MACHINERY CO LTD
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