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Bridge-plug-free immovable string casing damaged well chemical plugging technology

A technology for moving tubes and casings, applied in the directions of chemical instruments and methods, wellbore/well components, drilling compositions, etc., to achieve the effects of reducing risks, avoiding cost and time, and simplifying the preparation process

Active Publication Date: 2020-01-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no relevant report on the chemical plugging technology for casing damaged wells without bridging plugs and non-moving strings

Method used

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  • Bridge-plug-free immovable string casing damaged well chemical plugging technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a chemical plugging process for a casing damaged well without a bridge plug, including the following steps:

[0037] Step 1) Test the water absorption of casing damaged section under 10MPa pressure, and select wells with water absorption less than 200L / min for plugging;

[0038] Step 2) Run the varnish tubing into the casing of the casing damaged well 200 meters above the casing damage section, and close the casing gate;

[0039] Step 3) After injecting the guar gum liquid, it naturally sinks to the bottom of the well for 20-30 minutes, and the production layer is blocked to keep the liquid level unchanged. Inject clean water until the clean water level is 10-15 meters away from the lower edge of the casing damage section;

[0040] Step 4) After injecting the organic resin plugging agent system, settle naturally for 20-30 minutes to form the first resin plug, and shut down the well;

[0041] Step 5) Prepare the organic resin plugging agent syst...

Embodiment 2

[0045] This embodiment provides a chemical plugging process for a casing damaged well without a bridge plug, including the following steps:

[0046] Step 1) Use a conventional packer to test the water absorption of the casing damaged section of the casing damaged well under a pressure of 10MPa, and select the well with a water absorption of less than 200L / min for plugging;

[0047] Step 2) Run the varnish tubing into the casing of the casing damaged well 200 meters above the casing damage section, and close the casing gate;

[0048] Step 3) Prepare and inject 300-400L of guar gum solution with a mass concentration of 0.35-0.55%, let it sink naturally for 20-30 minutes to the bottom of the well, and plug the production layer, keep the liquid level constant, inject clean water, and calculate the amount of clean water, so that The clear water level is located 10-15 meters away from the lower edge of the casing damage section;

[0049] Step 4) Prepare and inject 100-200L organic ...

Embodiment 3

[0059] In this embodiment, the method of the present invention is used to carry out on-site construction of Yuan A well. Well Yuan A is an oil production well put into production in September 2014. Before casing damage, the oil production was 3.3t / d. In August 2018, casing damage was found, and the water cut after casing damage was 100%. Engineering logging found that the casing damage section was 3 meters (1156m-1159m), the perforation section is 1312-1316m, and the chemical plugging operation is carried out.

[0060] The plugging process is as follows:

[0061] 1. Using a conventional packer to test the casing damage section of the casing damage well, the water absorption is 330L / min under the pressure of 10MPa;

[0062] 2. Lower the light oil pipe to 956 meters in the casing of the casing damaged well, and close the casing gate;

[0063] 3. Prepare and inject 300L of 0.35% guar gum solution, let it sink naturally for 20 minutes to the bottom of the well, and plug the prod...

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Abstract

The invention provides a bridge-plug-free immovable string casing damaged well chemical plugging technology. The technology comprises the steps that a production layer is occupied and plugged with a guanidine-gum-based solution, the density difference and wettability of organic resin, guanidine gum and water are used, a mechanical bridge plug is replaced by injecting suspended organic resin, andmeanwhile, an immovable string squeezes and injects a plugging agent to a casing damaged well with a large water absorption amount, so that chemical plugging of the casing damaged well is completed inone pass. The bridge-plug-free immovable string casing damaged well chemical plugging technology reduces the cost, avoids cost and time waste caused by multiple times of bridge plug arranging, and avoids the secondary loss of inner walls of fragile casings of old bridge plug casing damaged wells and inner wall corrosion acceleration caused by the secondary loss. The labor intensity in the construction process is greatly reduced. No plugging agent exists in the string, so that the risk that a drilling tool is stuck during plugging operation is greatly reduced, and the chemical plugging operation time is greatly shortened.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a chemical plugging process for casing damaged wells without bridging plugs and fixed pipe strings. Background technique [0002] With the increase of the production life of multi-layer oilfields, coupled with the influence of geological conditions and engineering factors, casing damage and fluid leakage outside the casing often occur, affecting the stable production of the oilfield and the smooth implementation of the development plan, and even causing production shutdown, seriously affecting It improves the effective water injection and ultimate recovery of the reservoir. At present, the commonly used channeling and leakage sealing technology mainly uses cement, resin, organic materials, etc. for chemical sealing. Most of the mechanical bridge plugs are used to seal off the production layer. The tool tubing replaces the plugging agent to the vicinity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13C09K8/44
CPCE21B33/13C09K8/44
Inventor 郭钢李琼玮杨立华卢文伟孙雨来程碧海王小勇李慧谷成义戚建晶
Owner PETROCHINA CO LTD
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