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Jam releasing dissolving agent for downhole bridge plug/packer jamming rubber part

A packer and solvent elimination technology, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of strength and elasticity decrease, swelling and aging of sealant cylinders, prolonging construction period, etc., and achieves a simple preparation method. Effect

Active Publication Date: 2016-12-21
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the in-hole bridge plug and packer have been in the well for a long time, under the high-temperature and high-pressure environment of the wellbore, the sealing rubber tube will swell and age, increase in hardness, and decrease in strength and elasticity. , the rubber tube (piece) cannot shrink, pull the reversed rubber piece, etc., causing the pipe string to be stuck by the damaged rubber piece in the well, causing the bridge plug or packer to be stuck and unable to be unsealed and salvaged normally. At the same time, after repeated pulling When the pipe string is moved so that the rubber parts wear out and the jamming is released, the oil column will be fatigued and damaged, which will easily cause accidents, increase the risk of complex conditions in the wellbore, and greatly prolong the construction period

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0028] The on-site implementation method of softening and dissolving rubber parts by using the downhole bridge plug / packer rubber part dissolving agent specifically includes the following steps:

[0029] 1) The amount of decontamination agent is generally 0.5m 3 , the decontamination agent is circulated through the tubing to the top of the bridge plug or packer through surface pumping equipment;

[0030] 2) Continuously lift and release the tubing string, movable bridge plug or packer within the range of the tensile strength of the tubing, so that the disinfectant can fully contact the rubber parts;

[0031] 3) Shut the well and react for 24 hours, let the ablation agent fully react with the rubber parts, and finally soften and dissolve the rubber parts;

[0032] 4) Lift and release the tubing string within the range of the tensile strength of the tubing, so that the bridge plug or packer can be smoothly released and pulled out of the wellbore.

Embodiment 1

[0034] Prepare a mixed solution of 150L ethyl acetate, 150L acetone, and 200L n-propanol at room temperature. This disinfectant can effectively soften and dissolve rubber parts within 24 hours, and has no corrosion damage to metals.

[0035] The specific operation steps of using the bridge plug / packer glue dissolving agent prepared in the embodiment to soften and decompose the downhole bridge plug or packer sealant bucket are as follows:

[0036] 1) Use the ground pumping equipment to circulate the prepared decontamination agent through the tubing

[0037] 2) Calculate the volume of the displacement fluid, and start pumping the displacement fluid after all the disintegrant is pumped into the tubing.

[0038] 3) Disinfectant flows to the top of the bridge plug or packer through the fishing head or circulation valve on the top of the bridge plug or packer, and then stops the pump

[0039] 4) Continuously lift and release the tubing string, movable bridge plug or packer within t...

Embodiment 2

[0043] Prepare a mixed solution of 125L ethyl acetate, 150L acetone, and 225L n-propanol at room temperature. This disinfectant can effectively soften and dissolve rubber parts within 24 hours, and has no corrosion damage to metals.

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PUM

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Abstract

The invention discloses a jam releasing dissolving agent for a downhole bridge plug / packer jamming rubber part. The jam releasing dissolving agent is prepared by mixing the following components in percentage by volume of 25%-35% of ethyl acetate, 25%-35% of acetone and 35%-45% of n-propanol. The jam releasing dissolving agent disclosed by the invention is simple in preparation method, and suitable for field operation, finally, jamming of a bridge plug or a packer is removed, and a wellbore can be smoothly lifted.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, in particular to a jam-relieving and dissolving agent for downhole bridge plugs / packers to fix stuck rubber parts. technical background [0002] In the production process of oil and gas (water) wells, tools such as packers and bridge plugs are usually used to stratify, isolate, and seal reservoirs and wellbores. The main components of their sealing functions are rubber products. If the in-hole bridge plug and packer have been in the well for a long time, under the high-temperature and high-pressure environment of the wellbore, the sealing rubber tube will swell and age, increase in hardness, and decrease in strength and elasticity. , the rubber tube (piece) cannot shrink, pull the reversed rubber piece, etc., causing the pipe string to be stuck by the damaged rubber piece in the well, causing the bridge plug or packer to be stuck and unable to be unsealed and salvaged normally. At the...

Claims

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Application Information

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IPC IPC(8): C09K8/524
CPCC09K8/524C09K2208/02
Inventor 杨昱魏志红杨震威薛建国屈兴华付瑞娟杜鑫芳
Owner BC P INC CHINA NAT PETROLEUM CORP
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