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Polyacrylamide strong gel for well control and preparation method thereof

A technology of polyacrylamide and strong gel, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost, poor temperature resistance, and limited compressive strength, and achieve high viscosity modulus, The effect of good compressive strength and high elastic modulus

Active Publication Date: 2014-01-22
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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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 overcome the problems of high cost, limited compressive strength and poor temperature resistance of well killing polymer gels in the prior art, and provide a polyacrylamide strong gel for well killing and its preparation method

Method used

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  • Polyacrylamide strong gel for well control and preparation method thereof
  • Polyacrylamide strong gel for well control and preparation method thereof
  • Polyacrylamide strong gel for well control and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A strong polyacrylamide gel for well killing, consisting of the following components and contents:

[0027] Base fluid: based on the mass of the total polyacrylamide strong gel solution for well killing, 1% polyacrylamide, 8% structural enhancer, 8% anti-dehydrating agent, 0.2% antioxidant, and the balance is water;

[0028] Cross-linking agent: based on the mass fraction of the cross-linking agent relative to the base liquid, the cross-linking agent accounts for 10%.

[0029] The viscosity of the polyacrylamide strong gel is greater than 100000 mPa?s (1.5s -1 , 100°C), the compressive strength reaches 0.4-1.7MPa / 10m.

[0030] In the present invention, the polyacrylamide is a mixture of one or more of nonionic, cationic, anionic and amphoteric polyacrylamides in any proportion.

[0031] In the present invention, the molecular weight of the polyacrylamide is between 1 million and 12 million.

[0032] In the present invention, the structure reinforcing agent is calcium...

Embodiment 2

[0039] This embodiment is basically the same as the above-mentioned embodiment, the main differences are as follows:

[0040] A strong polyacrylamide gel for well killing, consisting of the following components and contents:

[0041] Base fluid: Based on the mass of the total polyacrylamide strong gel solution for well killing, 6% polyacrylamide, 2% structural enhancer, 0.4% anti-dehydrating agent, 4% antioxidant, and the balance is water;

[0042] Cross-linking agent: based on the mass fraction of the cross-linking agent relative to the base liquid, the cross-linking agent accounts for 0.2%.

[0043] A method for preparing a polyacrylamide strong gel for well killing, comprising: adding polyacrylamide, antioxidants, anti-dehydrating agents and structural enhancers to water in sequence at a stirring speed of 450 rpm, fully dissolving Finally, add a cross-linking agent and form a gel at 120°C.

[0044] In the present invention, after adding the crosslinking agent, the crossli...

Embodiment 3

[0046] This embodiment is basically the same as the above-mentioned embodiment, the main differences are as follows:

[0047] A strong polyacrylamide gel for well killing, consisting of the following components and contents:

[0048] Base fluid: based on the mass of the total polyacrylamide strong gel solution for well killing, 3% polyacrylamide, 4% structural enhancer, 4% anti-dehydrating agent, 2% antioxidant, and the balance is water;

[0049] Cross-linking agent: based on the mass fraction of the cross-linking agent relative to the base liquid, the cross-linking agent accounts for 6%.

[0050] A preparation method of polyacrylamide strong gel for well killing, comprising: adding polyacrylamide, antioxidant, anti-dehydrating agent and structural enhancer in water at a stirring speed of 400 rpm, fully dissolving Finally, add a cross-linking agent and form a gel at 100°C.

[0051] In the present invention, after adding the crosslinking agent, the crosslinking reaction time is...

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Abstract

The invention discloses a polyacrylamide strong gel for well control and a preparation method thereof. The polyacrylamide strong gel for well control consists of the following components in percentage by weight: a base solution comprising 1-6% of polyacrylamide, 2-8% of a structure reinforcing agent, 0.4-8% of an anti-dehydrating agent, 0.2-4% of an antioxidant and the balance of water according to the total solution mass of the prepared polyacrylamide strong gel for well control, and 0.2-10% of a crosslinking agent relative to the mass fraction of the base solution. The polyacrylamide strong gel prepared by the preparation method has the characteristics of high strength, good elasticity, good toughness, good adhesion, high compression strength, good gas tightness and the like, can be directly gelatinized and used in an N80 tube special for an oil field, can be adhered to a sleeve, and can effectively prevent gas from escaping out of a pit shaft to achieve good effects of well control and sealing.

Description

technical field [0001] The invention relates to a strong polyacrylamide gel for killing wells and a preparation method thereof. The gel can be used as a well killing material in oil field workover and underbalanced drilling processes. Background technique [0002] The development of oil and gas fields requires drilling, well completion, and workover operations. Conventional well killing fluids are prone to leakage and cause great damage to the formation. In order to solve the actual problems on site, in recent years, petroleum workers have conducted research on technologies such as low-damage and anti-leakage killing fluid, gel plugging technology, snubbing operation, and underbalanced drilling and completion. The above technologies have their own advantages. , Shortcomings, wherein the snubbing device needs a lot of time to install equipment before use, and needs a lot of time to trip during use. However, the casing valve, which protects the formation in underbalanced oper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/40C09K8/44
CPCC09K8/44C09K8/882C09K8/887
Inventor 任雁鹏汪小宇李志航王玉功李勇林梅钦王所良唐冬珠汪成马托王季鹏杨发金娜李童
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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