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Method for preparing shearing strength improving agents for drilling fluid

A cutting agent and drilling fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of ineffective effect, broken chain, failure, etc., to avoid broken chain failure and obvious cutting effect , Improve the effect of high temperature resistance

Inactive Publication Date: 2017-08-11
张芸
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: Aiming at the problem that the traditional cutting agent for drilling fluid is prone to chain breakage and failure under high temperature conditions, and the effect is not obvious under low shear conditions, a lifting agent for drilling fluid is provided. Preparation method of cutting agent

Method used

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  • Method for preparing shearing strength improving agents for drilling fluid

Examples

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Comparison scheme
Effect test

example 1

[0020] First, add 50g of itaconic acid, 0.4g of azobisisobutyronitrile, 400mL of N,N-dimethylformamide in sequence in the three-necked flask, stir and mix with a glass rod for 15min, then add 30mL of 3-chloropropene, and then put the three-necked flask Transfer to a digital display speed measuring constant temperature magnetic stirrer, and pass nitrogen gas into the three-necked flask at a rate of 5mL / min, under the condition of nitrogen protection, at a temperature of 85°C and a rotation speed of 600r / min, stir and react at a constant temperature for 12h; After the constant temperature stirring reaction is completed and naturally cooled to room temperature, add 10mL of ethylenediamine and 0.5g of N,N'-methylene bisacrylamide to the three-necked flask in sequence, and then move the three-necked flask to a digital speed measuring constant temperature magnetic stirrer , adjust the temperature to 80°C, and the stirring speed to 500r / min. Under constant temperature stirring, add 5 ...

example 2

[0023]First, add 30g of itaconic acid, 0.2g of azobisisobutyronitrile, 300mL of N,N-dimethylformamide into the three-necked flask, stir and mix with a glass rod for 10min, then add 20mL of 3-chloropropene, and then put the three-necked flask Transfer to a digital display speed measuring constant temperature magnetic stirrer, and pass nitrogen gas into the three-necked flask at a rate of 3mL / min, under the condition of nitrogen protection, at a temperature of 80°C and a rotation speed of 400r / min, stir and react at a constant temperature for 8h; After the constant temperature stirring reaction is completed and cooled to room temperature naturally, add 8mL of ethylenediamine and 0.3g of N,N'-methylenebisacrylamide to the three-necked flask successively, and then move the three-necked flask to a digital speed measuring constant temperature magnetic stirrer , adjust the temperature to 75°C, and the stirring speed to 300r / min. Under constant temperature stirring, add 3 mL of sulfuri...

example 3

[0026] First, add 40g itaconic acid, 0.2~0.4g azobisisobutyronitrile, 300~400mL N,N-dimethylformamide in sequence in a three-neck flask, stir and mix with a glass rod for 10~15min, then add 20~30mL 3 -Chloropropene, then transfer the three-necked flask to a digital display speed measuring constant temperature magnetic stirrer, and feed nitrogen gas into the three-necked flask at a rate of 3-5mL / min, under nitrogen protection, at a temperature of 80-85°C, Under the condition of 400~600r / min, stir and react at constant temperature for 8~12h; after the stirring reaction at constant temperature is completed and cooled to room temperature naturally, add 8~10mL ethylenediamine, 0.3~0.5g N,N'- Methylbisacrylamide, and then move the three-necked flask to a digital display speed measuring constant temperature magnetic stirrer, adjust the temperature to 75-80°C, and stir at a speed of 300-500r / min. Add 3 to 5 mL of sulfuric acid with a mass fraction of 98% dropwise into the flask, and c...

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Abstract

The invention relates to a method for preparing shearing strength improving agents for drilling fluid, and belongs to the technical field of petroleum materials. The method includes steps of carrying out reaction on itaconic acid and 3-chloropropene by the aid of azodiisobutyronitrile and N, N-dimethylformamide to form copolymers; adding ethanediamine and N, N'-methylene bisacrylamide into the copolymers and carrying out cross-linking on the copolymers to form three-dimensional network structures; carrying out reaction by the aid of iodine catalyzed magnesium powder and bromobenzene to generate Grignard reagents; grafting benzene ring structures on the surfaces of the cross-linked copolymers by the aid of the Grignard reagents; carrying out rotary evaporation and concentration and then carrying out drying. The azodiisobutyronitrile is used as an initiator, and the N, N-dimethylformamide is used as a solvent. The method has the advantages that the high-temperature-resistant weak-gel shearing strength improving agents for the drilling fluid have high-temperature resistance, the rock debris suspension capacity of the drilling fluid can be improved effectively, well wall scouring due to the drilling fluid can be weakened, and accordingly the method has a broad application prospect.

Description

technical field [0001] The invention relates to a preparation method of a cutting agent for drilling fluid, belonging to the technical field of petroleum materials. Background technique [0002] With the increase of world energy demand and the development of drilling technology, the number of existing deep wells and ultra-deep wells is also increasing. During drilling, the deeper the wellbore, the higher the temperature inside the wellbore. Because all additives in drilling fluid will be oxidized and decomposed to lose their original structure under high temperature conditions, the rheology of drilling fluid is difficult to control, and the problem of high temperature resistance of drilling fluid is becoming more and more prominent. The anti-high temperature cutting agent is one of the indispensable drilling fluid treatment agents in the drilling process. It can adjust the suspended cuttings in the drilling fluid, form a stagnant layer near the well wall, reduce the erosion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/02C08F214/14C08F267/02C08F222/38C08F8/42C08F8/32C09K8/035
CPCC08F222/02C08F8/42C08F267/02C09K8/035C08F214/14C08F222/385C08F8/32
Inventor 张芸薛洋许丽君
Owner 张芸
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