Expansion lost circulation additive, preparation method of expansion lost circulation additive, microcapsule-type lost circulation additive, water-based drilling fluid and application of lost circulation additives

A plugging agent and microcapsule technology, which is applied in the field of drilling fluid treatment agent, can solve the problems of unsatisfactory plugging effect, well leakage, malignant leakage, etc., and achieve the effect of low cost, simple method, and reduction of processing time and cost

Active Publication Date: 2019-05-24
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an expansion plugging agent and its preparation method and microcapsule type in order to overcome the problem of well leakage in the prior art that often occurs during the drilling process, especially the problem of malignant leakage, and the problem of unsatisfactory plugging effect. Lost circulation agent and water-based drilling fluid and its application

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  • Expansion lost circulation additive, preparation method of expansion lost circulation additive, microcapsule-type lost circulation additive, water-based drilling fluid and application of lost circulation additives

Examples

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preparation example Construction

[0035] The second aspect of the present invention provides a method for preparing the aforementioned expansion plugging agent, wherein the method includes the following steps:

[0036] (1) Starch is added into deionized water to carry out gelatinization reaction to obtain gelatinized colloid;

[0037] (2) carry out neutralization reaction with acidity neutralizer and acrylic acid to obtain acrylate;

[0038] (3) In the presence of a cross-linking agent and an initiator, the acrylamide, the strength-enhancing material, the pasting colloid and the acrylate are subjected to a polymerization reaction.

[0039] Wherein, in step (1), the conditions of the gelatinization reaction include: heating in a water bath, the temperature is 75-95°C, the pH value is 7.8-8.6, the stirring rate is 1000-2000 rpm, and the time is 30-45 minute.

[0040] Wherein, in step (2), the acrylate is obtained by neutralizing the acidity neutralizer and the second acrylic acid; in the present invention, pre...

Embodiment 1

[0086] This embodiment is to illustrate the expansion plugging agent of the present invention and its preparation method

[0087] (1) 100 grams of deionized water are injected into a beaker, and sodium hydroxide is added under a stirring environment at a rate of 1500 rpm to prepare a sodium hydroxide solution with a concentration of 40 wt %; and the resulting sodium hydroxide solution and an appropriate amount of the second Carry out neutralization reaction in diacrylic acid;

[0088] (2) Pour 100 grams of deionized water into the beaker, add 5 grams of starch under the stirring environment of 1500 rpm, and stir for 30 minutes under the stirring environment of 1500 rpm after being completely dissolved to make it into a paste Colloid, the value of the apparent viscosity of gelatinized colloid is 20 mPas;

[0089] (3) Add 2.3 grams of first acrylic acid and 4.7 grams of acrylamide to the paste-like colloid obtained in step (2) under a stirring environment at a rate of 1500 rpm....

Embodiment 2

[0094] This embodiment is to illustrate the expansion plugging agent of the present invention and its preparation method

[0095] (1) 100 grams of deionized water are injected into a beaker, and sodium hydroxide is added under a stirring environment at a speed of 1400 rpm to prepare a sodium hydroxide solution with a concentration of 38 wt %; and the resulting sodium hydroxide solution and an appropriate amount of the second Carry out neutralization reaction in diacrylic acid;

[0096] (2) Pour 100 grams of deionized water into the beaker, add 4 grams of starch under a stirring environment of 1500 rpm, and stir for 40 minutes under a stirring environment of 1500 rpm after being completely dissolved to make it into a paste Colloid, the value of the apparent viscosity of gelatinized colloid is 30 mPas;

[0097] (3) Add 3 grams of first acrylic acid and 4.2 grams of acrylamide to the paste-like colloid obtained in step (2) under a stirring environment at a rate of 1400 rpm. The...

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Abstract

The invention relates to the field of drilling fluid treatment agents and discloses an expansion lost circulation additive, a preparation method of the expansion lost circulation additive, a microcapsule-type lost circulation additive, a water-based drilling fluid and application of the lost circulation additives. The expansion lost circulation additive is prepared in the mode that acrylamide, a strength improvement material, acrylate and gelatinization colloid are subjected to a polymerization reaction, acrylate is prepared in the mode that an acidity neutralizer and acrylic acid are subjected to a neutralization reaction, and the gelatinization colloid is prepared in the mode that starch is added to deionized water for a gelatinization reaction. The expansion lost circulation additive for the drilling fluid is stable in structure, high in strength, good in viscoelasticity, does not easily deform under the high-temperature and high-pressure environment of a well bottom and has a lostcirculation stopping effect.

Description

technical field [0001] The invention relates to the field of drilling fluid treatment agents, in particular to an expansion plugging agent and a preparation method thereof, a microcapsule type plugging agent, water-based drilling fluid and applications thereof. Background technique [0002] Lost circulation is a downhole complex situation in which working fluid leaks into the formation in drilling engineering, and it is one of the most common and frequently encountered complex problems in drilling operations. Because the downhole complex situation caused by lost circulation is very harmful to the drilling and completion construction, the lost circulation has always been a matter of great concern to the petroleum engineering circles at home and abroad. In the drilling operation, once leakage occurs, not only the drilling time will be delayed, the drilling fluid will be lost, the oil and gas layers will be damaged, and the normal progress of the geological logging work will be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/42C08F251/00C08F289/00C08F220/06C08F220/56C08F222/38
CPCC04B20/1025C04B26/06C09K8/426C09K8/44Y02W30/91C04B14/28C04B24/2641C04B24/2652C04B24/38C04B18/248C09K2208/04C09K2208/30
Inventor 白杨罗平亚程焱蒋官澄胡亚琴李国军张昊李成
Owner SOUTHWEST PETROLEUM UNIV
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