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Mud cake toughening improver for drilling fluid and preparation method of mud cake toughening improver

A technology of drilling fluid and improver, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of cementing interface cement strength decline, inability to solidify well, affect cementing quality, etc., and achieve excellent retaining wall performance , Guarantee the effect of well wall stability and high toughness

Active Publication Date: 2019-04-19
北京宏勤石油助剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the oil well is drilled, a mud cake with a certain thickness and poor strength will be formed on the well wall and the casing wall. The existence of the mud cake will cause the cement slurry to fail to solidify and bond well between the well wall and casing wall, and eventually lead to cementing. Decreased bonding strength at the interface seriously affects cementing quality
Therefore, the quality of the mud cake formed in the drilling process has an important influence on the role of the drilling fluid system in the wall protection process, but there are few relevant reports on the mud cake toughening modifier at present, so it is necessary to provide a better Performance of mud cake toughening modifier has important production significance

Method used

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  • Mud cake toughening improver for drilling fluid and preparation method of mud cake toughening improver
  • Mud cake toughening improver for drilling fluid and preparation method of mud cake toughening improver
  • Mud cake toughening improver for drilling fluid and preparation method of mud cake toughening improver

Examples

Experimental program
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Effect test

preparation example 1

[0026] The preparation method of the modified starch is as follows: in parts by weight, 110 parts of water are added to the reaction kettle, stirred and heated to 50°C, 25 parts of cornstarch are added, and then 4 parts of sodium hypochlorite solution is added, and after stirring at 50°C for 25min, Add 12 parts of sodium hydroxide solution;

[0027] Then add 250 parts of isopropanol and 330 parts of cationic etherification agent (purchased from Shandong Yifei Pharmaceutical Co., Ltd., model is yf-17), stir and react at 30°C for 4.5h, dry, pulverize and pass through a 90-mesh sieve, namely modified starch.

preparation example 2

[0029] The preparation method of modified starch is carried out according to the method in Preparation Example 1, the difference is that, in parts by weight, 100 parts of water are added to the reactor, the temperature is stirred to 45 ° C, 20 parts of cornstarch are added, and then 2 parts of cornstarch are added. 10 parts of sodium hypochlorite solution was stirred at 50°C for 20 minutes, and then 10 parts of sodium hydroxide solution were added;

[0030] Then add 200 parts of isopropanol and 300 parts of cationic etherification agent (purchased from Shandong Yifei Pharmaceutical Co., Ltd., model is yf-17), stir and react at 25°C for 4 hours, dry, crush and pass through a 80-mesh sieve to obtain modified starch.

preparation example 3

[0032] The preparation method of modified starch is carried out according to the method in Preparation Example 1, the difference is that, in parts by weight, 120 parts of water are added to the reaction kettle, stirred and heated to 60 °C, 30 parts of corn starch are added, and then 5 parts of Sodium hypochlorite solution, after stirring at 50°C for 30 minutes, add 15 parts of sodium hydroxide solution;

[0033] Then add 300 parts of isopropanol and 350 parts of cationic etherification agent (purchased from Shandong Yifei Pharmaceutical Co., Ltd., model is yf-17), stir and react at 35°C for 5 hours, dry, and crush through a 100-mesh sieve to obtain modified starch.

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Abstract

The invention discloses a mud cake toughening improver for a drilling fluid. The mud cake toughening improver is prepared from, by weight, 60-80 parts of modified starch, 20-45 parts of cellulose, 35-50 parts of synthetic resin, 5-20 parts of a toughening additive and 15-30 parts of lignin. The invention also discloses a preparation method of the mud cake toughening improver for the drilling fluid. The method comprises the following steps that the cellulose and 1 / 3 modified starch are stirred and mixed uniformly, then the synthetic resin is added, stirring is performed for 40-60 min at 85-120DEG C, the rotation speed is 4500-6000 r / min, the lignin and the remaining 2 / 3 modified starch are added, stirring is performed for 1.5-2 h, the rotation speed is 3000-4000 r / min, then the temperatureis adjusted to 70-110 DEG C, the toughening additive is added, stirring is performed for 4-5 h, drying is performed, and the mud cake toughening improver is obtained. The mud cake toughening improverhas the advantages that when the prepared mud cake toughening improver is applied to the drilling fluid and then acts, a formed mud cake is thinner and more tough, and the wall protection performanceis more excellent.

Description

technical field [0001] The invention relates to the field of additives for drilling fluids, in particular to a mud cake toughening modifier for drilling fluids and a preparation method thereof. Background technique [0002] Mud cake is a solid phase deposit deposited on the filter medium (borehole wall, formation layer or filter paper) during the filtration process of drilling fluid. After the oil well is drilled, a mud cake with a certain thickness and poor strength will be formed on the well wall and the casing wall. The existence of the mud cake will cause the cement slurry to fail to solidify and bond well between the well wall and casing wall, and eventually lead to cementing. The interface cementation strength decreases, seriously affecting the cementing quality. Therefore, the quality of the mud cake formed in the drilling process has an important influence on the role of the drilling fluid system in the wall protection process, but there are few relevant reports on ...

Claims

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Application Information

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IPC IPC(8): C09K8/035
CPCC09K8/035C09K2208/12
Inventor 卢新玉沈勤长曹何山
Owner 北京宏勤石油助剂有限公司
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