Semi-interpenetrating network gel plugging material for oil and gas fields and preparation method thereof

A technology of semi-interpenetrating network and leak-stopping material, which is applied in the field of semi-interpenetrating network gel leak-stopping material and preparation field for oil and gas fields, can solve the problem of cracked and karst leakage without breakthrough progress, and the gel strength is difficult to achieve Effective plugging, difficult to control cross-linking time, etc., to achieve the effects of excellent penetration ability, improved jelly strength and shear toughness, improved success rate and pressure bearing capacity

Pending Publication Date: 2020-08-14
四川格瑞迪斯石油技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for malignant formation loss, the success rate of conventional bridge plugging is very low; the bridge plugging material is difficult to stay in the lost zone around the wellbore, and it is easy to mix with formation fluid and flow away after being diluted, thus plugging It is difficult for the slurry to form a tight seal of sufficient strength around the wellbore
At present, many R&D institutions at home and abroad have developed a variety of cross-linked polymer-based plugging materials and processes, but no breakthroughs have been made in the treatment of fractures and karst cavities.
In particular, the cross-linking time of cross-linked polymer-based plugging materials is difficult to control, and the gel strength after gelation is difficult to meet the requirements of effective plugging, so polymer plugging materials still need a lot of research work

Method used

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  • Semi-interpenetrating network gel plugging material for oil and gas fields and preparation method thereof
  • Semi-interpenetrating network gel plugging material for oil and gas fields and preparation method thereof
  • Semi-interpenetrating network gel plugging material for oil and gas fields and preparation method thereof

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preparation example Construction

[0032] According to another aspect of the present application, there is also provided a method for preparing the above-mentioned plugging material, which includes the following steps: S1: dissolving the antioxidant in water to form solution A; S2: dissolving the polyacrylamide polymer , polyvinylpyrrolidone and cross-linking agent are dispersed into the solution A according to the proportion and mixed evenly to obtain the base liquid of the semi-IPN gel plugging material; S3: the base liquid of the semi-IPN gel plugging material After reacting for 8-12 hours, cross-link to obtain the semi-interpenetrating network gel plugging material.

[0033] In order to simulate the natural environment, fully dissolve the polyacrylamide polymer, polyvinylpyrrolidone and cross-linking agent, and mix them uniformly with the solution A, preferably, the polyacrylamide polymer, polyvinyl When the vinylpyrrolidone and cross-linking agent are dispersed into the solution A according to the proporti...

Embodiment 1

[0039] Dissolve 0.1wt% thiourea in water. Then, 4wt% of acrylamide and 2-acrylamide-2-methylpropanesulfonic acid copolymer (P(AM-co-AMPS)) with a molecular weight of 250,000 and a degree of hydrolysis of 10wt% and 0.2wt% of K90 polyvinylpyrrolidone, 0.5wt% water-soluble phenolic resin cross-linking agent, 0.1% chromium acetate are fully mixed and then dispersed into clear water, continuously stirred for 0.5-1h to fully dissolve, at 20-60°C circulation temperature, 8- After 12 hours, the semi-interpenetrating network gel plugging material was obtained by cross-linking.

Embodiment 2

[0041] Dissolve 0.2wt% sodium bisulfite in clear water. Then, 1 wt% of acrylamide with a molecular weight of 2 million and a degree of hydrolysis of 5 wt% was cross-linked with acrylic acid (P(AM-co-AA)), 5 wt% of K15 polyvinylpyrrolidone, and 0.3 wt% of water-soluble phenolic resin agent and 0.05% aluminum citrate cross-linking agent are mixed and dispersed into clean water, and continuously stirred for 0.5-1h to fully dissolve, and at a circulating temperature of 90-120°C, cross-link after 8-12h to obtain a semi-interpenetrating network gel plug Leakage material.

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Abstract

The invention discloses a semi-interpenetrating network gel plugging material for oil and gas fields and a preparation method. The plugging material comprises, by weight, 2-5% of a polyacrylamide polymer, 0.1-10% of polyvinylpyrrolidone, 0.1-3% of a cross-linking agent, and 0.1-0.3% of an antioxidant, with the balance being water. The preparation method comprises the following steps: dissolving the antioxidant in water to form a solution A; dispersing the polyacrylamide polymer, the polyvinylpyrrolidone and the cross-linking agent into the solution A according to a ratio, and uniformly mixingto obtain a semi-interpenetrating network gel plugging material base solution; and reacting the semi-interpenetrating network gel plugging material base solution for 8-12 hours, and crosslinking to obtain the semi-interpenetrating network gel plugging material. According to the plugging material disclosed by the invention, a chemical blending network system is formed after the polyvinylpyrrolidoneand a polyacrylamide polymer cross-linked network are interpenetrated or entangled, and the plugging material has high gelatinizing strength and high shear toughness under a high-temperature condition, and has higher pressure-bearing capacity and an excellent plugging effect.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a semi-interpenetrating network gel plugging material for oil and gas fields and a preparation method thereof. Background technique [0002] Lost circulation is a common well-complex situation in drilling engineering, and most drilling processes have different degrees of lost circulation. Severe lost circulation will lead to a drop in pressure in the well, affecting normal drilling, causing wellbore instability, and inducing formation fluids to pour into the wellbore and blow out. Once lost circulation occurs during drilling, it is necessary to carry out plugging operations. The plugging operation usually involves pumping the plugging material to the leaky zone through pumping equipment, and after the plugging material forms an effective seal in the lost zone, the follow-up drilling work is carried out. [0003] At present, the most widely used plugging te...

Claims

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Application Information

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IPC IPC(8): C09K8/42C09K8/44
CPCC09K8/426C09K8/44
Inventor 张洪旭饶福家张超韦青青汤卫华郭振斌
Owner 四川格瑞迪斯石油技术有限公司
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