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A kind of high temperature resistant modified starch and its preparation method and application

A high-temperature and starch-resistant technology, applied in the field of petroleum drilling fluids, can solve problems affecting drilling quality and drilling costs, affecting the overall performance of drilling fluids, and weakening the filtration loss reduction effect, achieving improved temperature resistance, good salt resistance, The effect of improving temperature resistance

Active Publication Date: 2019-08-20
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, commonly used modified starch fluid loss reducers such as pregelatinized starch, carboxymethyl starch, hydroxyethyl starch, etc. all have the defect of poor temperature resistance. If the temperature exceeds 120 ° C, the molecular chain of starch will break down. Fractures, resulting in weakened fluid loss reduction effect, seriously affecting the comprehensive performance of drilling fluid, thereby affecting drilling quality and drilling cost

Method used

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  • A kind of high temperature resistant modified starch and its preparation method and application
  • A kind of high temperature resistant modified starch and its preparation method and application

Examples

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preparation example Construction

[0024] The invention provides a method for preparing high temperature resistant modified starch, comprising the following steps:

[0025] (1) provide the aqueous solution of grafting agent;

[0026] adjusting the pH value of the aqueous solution of the grafting agent to 6-8 by using an alkaline pH regulator to obtain a neutral solution of the grafting agent;

[0027] Mixing the neutral grafting agent solution with a crosslinking agent to obtain a modifier solution;

[0028] (2) After mixing the base starch and water, gelatinize the obtained starch milk to obtain gelatinized starch; the mass ratio of the base starch to water is (1-2): (50-100);

[0029] (3) Alternately dripping initiator and modifying agent solution into the gelatinized starch successively, a modification reaction occurs, and high temperature resistant modified starch is obtained;

[0030] The steps (1) and (2) are not in chronological order;

[0031] In parts by mass, the base starch is 1-2 parts, and the g...

Embodiment 1

[0056] The following amounts are in parts by mass. Dissolve 12 parts of acrylamide, 20 parts of 2-acrylamide-2-methylpropanesulfonic acid and 13 parts of sodium p-styrenesulfonate in 100 parts of distilled water at a stirring rate of 150r / min After the dissolution is completed, 3 parts of vinylpyrrolidone and 8 parts of dimethyl diallyl ammonium chloride are added to the solution to obtain a monomer solution; 4 parts of NaOH are formulated into an aqueous solution with a mass fraction of 15%. In an ice-water bath environment, use 15% NaOH aqueous solution to adjust the pH value of the solution to 6.0-8.0, and add 0.02 parts of N,N-methylene bisacrylamide and 0.06 parts of tripropylene glycol dienyl ester to dissolve In the liquid, the modifier solution is obtained for subsequent use;

[0057] At a stirring rate of 150r / min, add 8 parts of tapioca starch and 80 parts of distilled water into the reactor to prepare 10% starch milk, and heat the starch milk in a water bath at 80°C...

Embodiment 2

[0061] The high temperature resistant modified starch prepared in Example 1 was added to the fresh water base pulp, wherein the fresh water base pulp included 100g of fresh water and 5g of evaluation soil; the addition amount of the high temperature resistant modified starch was 1wt.%, 1.5 wt.% and 2wt.%, respectively recorded as the first starch-fresh water base pulp, the second starch-fresh water base pulp and the third starch-fresh water base pulp, the fresh water base pulp, the first starch-fresh water base pulp, the second starch-fresh water base pulp After the starch-fresh water base slurry and the third starch-fresh water base slurry were stirred at high speed for 5 minutes, the filter loss at room temperature was measured by a normal temperature pressure filter loss meter; For aging treatment, high temperature and high pressure filter loss meter was used to measure the fluid loss, so as to evaluate the temperature resistance and salt resistance of the modified starch. T...

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Abstract

The invention provides a high temperature resistant modified starch and its preparation method and application. The invention converts the crystalline region of the base starch into an amorphous region through the gelatinization process, so that the -OH at the C6 position of the starch structural unit is exposed to the solution environment In the process, the concentration of ‑OH that can participate in the reaction is increased, the grafting rate between the base starch and the grafting agent is increased, and then the temperature resistance is improved; and the initiator and modifier solution are added alternately to prolong the activity of the starch free radical Long time, increase the grafting rate of the reaction monomer, and then improve the temperature resistance effect of the modified starch; also use N, N-methylenebisacrylamide and tripropylene glycol dienyl ester as cross-linking agents, combined with starch, Form a three-dimensional network structure to improve the temperature resistance effect. The results of the examples show that the high temperature resistant modified starch provided by the present invention is suitable for both fresh water slurry and salt water slurry, and it can still maintain a high fluid loss after high temperature treatment at 150°C, and has excellent temperature resistance.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling fluids, in particular to a high-temperature-resistant modified starch and a preparation method and application thereof. Background technique [0002] With the increasing demand for energy in the world and the deepening of oil and gas field development, shallow oil and gas resources can no longer meet the needs of today's society, and the development of deep oil and gas resources has become inevitable. As environmental protection issues become increasingly prominent, controlling the pollution of drilling fluids to the environment from the source and developing green water-based drilling fluid fluid loss additives that are environmentally friendly and have good temperature and salt resistance can not only improve the performance of drilling fluids, Effectively reduce the cost of drilling, and at the same time reduce the damage to the environment during the drilling process, and realize "g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/58C08F222/38C08F222/20C08B30/18C09K8/20
CPCC09K8/206C08B30/18C08F251/00C08F222/102C08F220/585
Inventor 李琦于培志安玉秀唐国旺
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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