Composite gel well killing rubber plug capable of rapidly gelatinizing and weighting at high temperature and preparation method thereof

A composite gel, high-temperature and fast technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of aggravation, high final setting strength, reservoir pollution, etc., and achieve a simple construction process and high final setting strength. , The effect of good glue forming performance

Active Publication Date: 2020-07-14
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to provide a composite gel kill plug with rapid gelation and aggravation at high temperature and its preparation method. The temperature resistance can reach 150°C, the gelling time at 150°C can be controlled within 2-24 hours, and the final setting strength is high. The thermal salt has good stability, which can overcome the problem that the fluid in the wellbore easily enters the formation and causes reservoir pollution in the current workover operation

Method used

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  • Composite gel well killing rubber plug capable of rapidly gelatinizing and weighting at high temperature and preparation method thereof
  • Composite gel well killing rubber plug capable of rapidly gelatinizing and weighting at high temperature and preparation method thereof
  • Composite gel well killing rubber plug capable of rapidly gelatinizing and weighting at high temperature and preparation method thereof

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preparation example Construction

[0063] The invention protects a preparation method of a high-temperature rapid gel-forming and weighted composite gel kill plug. The preparation method includes the following steps: firstly disperse the weighting agent of the formulated amount in water and stir, and after the weighting agent is fully dispersed, Add the formulated amount of toughening agent to it, after the toughener is uniformly dispersed, add the formulated amount of main agent, continue to stir for about 1-2 hours until the toughened agent is evenly distributed in the polymer solution, then add the formulated amount of crosslinking agent and a stabilizer, and stir evenly, that is, the preparation of the high-temperature rapid gel-forming and aggravated composite gel well-killing plug is completed.

[0064] In the present invention, after the main agent is dissolved in water, a covalent bond cross-linking reaction occurs with an organic cross-linking agent, finally forming a gel with high strength and good the...

Embodiment 1

[0070] In this example, the compound gel well-killing rubber plug with high-temperature rapid gelation and aggravation is composed of the following components in mass percentage: barite powder 0.5%; toughening agent nano-silica 5%; polyacrylamide KYPAM 2%, molecular weight 800×10 4 g / mol; cross-linking agent polyethyleneimine 1.0%, thiourea 0.02%, the rest is water.

[0071]This embodiment also protects the preparation method of the composite gel kill plug with high-temperature rapid gelation and aggravation. The specific implementation steps are: first disperse the barite powder of the formula amount in water and stir at room temperature, and wait for the barite powder After fully dispersed, add the formula amount of toughening agent nano-silica to it, after the nano-silica is uniformly dispersed, add the formula amount of the main agent (polyacrylamide KYPAM particles), continue to stir for about 1 to 2 hours until the toughening agent Evenly distribute in the polymer solut...

Embodiment 2

[0076] In this example, the compound gel well-killing rubber plug with high-temperature rapid gelation and aggravation is composed of the following components in mass percentage: barite powder 10%; molecular weight: 233.39g / mol, initial viscosity (97560mPa·s); toughening Agent (sodium montmorillonite) 5%; main agent (acrylamide / 2-acrylamide-2-methylpropanesulfonic acid binary copolymer) 2%, molecular weight 800×10 4 g / mol; cross-linking agent (polyvinylamine) 1.0%, thiourea 0.02%, and the rest is clear water.

[0077] This embodiment also protects the preparation method of the composite gel kill plug with high-temperature rapid gelation and aggravation. The specific implementation steps are: first disperse the barite powder of the formula amount in water and stir at room temperature, and wait for the barite powder After fully dispersed, add the toughening agent (sodium-based montmorillonite) of the formulated amount to it, and add the main agent (acrylamide / 2-acrylamido-2-meth...

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Abstract

The invention relates to a composite gel well killing rubber plug capable of rapidly gelatinizing and weighting at high temperature and a preparation method thereof. The problem that a common temporary plugging agent cannot effectively balance the formation pressure due to too small density in the drilling and completion process of the high-temperature and high-pressure oil and gas reservoir is solved; and the cementing time can be controlled within 2-24 hours, the final setting strength can reach the visual inspection code I level, dehydration and shrinkage are avoided within 90 days, and theplugging requirement of an oil reservoir at the temperature of 90-150 DEG C can be met. According to the invention, the flexibilizer and the copolymer are mixed and intercalated; the strength of a rubber plug system is effectively improved in the aspect of chemical gelling, the density of the rubber plug system is improved by adding the weighting agent, the physical performance of the rubber plugsystem is improved on the chemical basis, and the temporary plugging agent is convenient to prepare on site, high in operability and wide in application prospect in the field of safety risk control of downhole operation such as high-temperature and high-pressure drilling and completion and well repair.

Description

technical field [0001] The invention belongs to the field of oilfield development, and in particular relates to a high-temperature rapid gel-forming and aggravated composite gel kill plug and a preparation method thereof. Background technique [0002] For the drilling, completion and workover operations in easy-to-lose formations, the anti-leakage temporary plugging technology is usually used to complete the engineering operations. Liquid rubber plugs (commonly known as gels) are often used in the field of chemical plugging and anti-leakage plugging in oil and gas wells, but for high-temperature and high-pressure oil and gas reservoirs, it is necessary to increase the weight of the gel to reduce the density difference between the liquid rubber plug and the wellbore working fluid and avoid floating Cause leak-proof plugging to fail. In addition, the liquid rubber plug also needs to have good temperature resistance and flowback ability to minimize the pollution to the reservo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/504C09K8/512
CPCC09K8/512C09K8/5083C09K8/5045
Inventor 张振云朱方辉李明星李琼玮于淑珍刘伟董晓焕谷成义孙雨来李慧
Owner PETROCHINA CO LTD
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