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A kind of degradable modified starch-based polymer well wall anti-collapse material and preparation method thereof

A starch-based, polymer technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of high toxicity, poor temperature resistance, unfavorable promotion and use, etc.

Active Publication Date: 2021-04-23
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the products have good application effects and have achieved considerable economic benefits for the petroleum industry, but there are still some problems, such as: high cost, which is not conducive to popularization and use; high toxicity, which is not conducive to environmental protection; high fluorescence level, which affects geological logging ;Poor temperature resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] (1) Preparation of modified starch water-absorbent resin

[0020] Add 50 parts of cornstarch to the reactor equipped with an electric stirrer and a condenser tube, then add 100-200 parts of distilled water, heat, gelatinize at 90°C for 30min, then control the temperature to 70-80°C, add 0.05-0.08 After 10 minutes, add 5-10 parts of monomers and 0.006-0.012 parts of cross-linking agent N, N'-methylenebisacrylamide. After 3-4 hours of polymerization, vacuum dry to constant Heavy, pulverized to obtain solid powder, which is the modified starch water-absorbent resin;

[0021] (2) Take 10-14 parts of the above-mentioned modified starch water-absorbing resin, 3-6 parts of alkyl glucoside, 2-4 parts of cross-linking auxiliary agent, and 1-2 parts of defoaming auxiliary agent and mix evenly to obtain the anti-slump material.

[0022] The monomer is a mixture of acrylic acid and acrylamide, and the mass ratio of acrylic acid to acrylamide is 2:1-1:1.

[0023] The degree of neu...

Embodiment 1

[0029] The weight ratio of modified starch water-absorbing resin to alkyl glucoside, cross-linking aid, and defoaming aid is 14:6:4:2, the alkyl glucoside is isooctyl glucoside, and the cross-linking aid is PAC. The defoaming aid is powder defoamer Q-508 as an example:

[0030] Add 50g of cornstarch into a four-necked flask equipped with an electric stirrer and a condenser, then add 200 parts of distilled water, heat, gelatinize at 90°C for 30min, and then add 0.05g of potassium persulfate at a temperature of 75°C. After 10 minutes, add 6.7g of acrylic acid, neutralize with 3.7g of NaOH, 3.3g of acrylamide, cross-linking agent N,N'-methylenebisacrylamide 0.008g of mixed solution, after 3h of polymerization reaction, vacuum dry to constant weight , and pulverized to obtain a solid powder, which is the modified starch water-absorbent resin.

[0031] Weigh 14g of the above-prepared modified starch water-absorbent resin, 6g of isooctyl alkyl glucoside, 4g of cross-linking aid, an...

Embodiment 2

[0034] The weight ratio of modified starch water-absorbent resin to alkyl glucoside, cross-linking aid, and defoaming aid is 12:5:3:1, the alkyl glucoside is n-hexyl glucoside, and the cross-linking aid is PAC. The foam aid is powder defoamer Q-508 as an example

[0035] The raw material isooctyl alkyl glucoside in Example 1 was changed to n-hexyl glucoside, and the dosages of modified starch water-absorbing resin, n-hexyl alkyl glucoside, cross-linking auxiliary agent and defoaming auxiliary agent were adjusted to 12g, 5g, 3g and 1g. The amount of raw materials used for the preparation of the modified starch water-absorbing resin and the reaction conditions are unchanged, and the weight ratio of the modified starch water-absorbing resin to the alkyl glucoside, cross-linking auxiliary agent, and defoaming auxiliary agent is 12:5:3 : 1, alkyl glucoside is the anti-slump material sample of isooctyl glucoside.

[0036] Anti-slump material anti-slump temperature performance test...

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Abstract

The invention discloses a degradable modified starch-based polymer well wall anti-collapse material and a preparation method thereof, which consists of four components: modified starch water-absorbing resin, alkyl glycoside, cross-linking auxiliary agent and defoaming auxiliary agent. The preparation method is to use starch as the skeleton, acrylic acid and acrylamide as the graft comonomer, potassium persulfate as the initiator, N, N'-methylenebisacrylamide as the crosslinking agent, and polymerize in aqueous solution to form a modified Starch water-absorbent resin, mixed with alkyl glucoside, cross-linking aid, and defoaming aid in a weight ratio of 10-14:3-6:2-4:1-2 parts. The degradable modified starch-based polymer well wall anti-slump material synthesized by the present invention is biodegradable and will not cause damage to the stratum; the price is low; the synthesis process is simple; it is not easy to segregate under pressure and has good plugging performance: When the system is added at 3%, the filtration loss reduction rate is 60-80%, and the shale linear expansion inhibition rate is 55-80%; the temperature resistance is 180°C; it is non-toxic and has no fluorescence.

Description

technical field [0001] The invention belongs to the technical field of oilfield drilling and production materials, and in particular relates to a degradable modified starch-based polymer well wall anti-collapse material and a preparation method thereof. Background technique [0002] In recent years, with the expansion of the exploration field to new areas, the drilled formations have become increasingly complex, and the problem of wellbore instability has become a technical problem that restricts the speed of exploration and development. It not only affects the drilling speed, logging and cementing quality, but also makes it impossible to drill in some areas The target layer is reached, affecting the realization of the exploration purpose. [0003] The primary cause of borehole wall instability is the diffusion of pore pressure, that is, due to the drilling fluid filtrate entering the rock pores, the pore pressure increases, the effective binding force between mineral partic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F222/14C08B30/18C09K8/512C09K8/514
CPCC08B30/18C08F251/00C09K8/512C09K8/514C09K8/887C09K8/905C09K2208/12C08F220/06C08F220/56
Inventor 费学宁谈笑张宝莲曹凌云徐福召
Owner TIANJIN CHENGJIAN UNIV
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