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A kind of environment-friendly plugging agent for drilling fluid and preparation method thereof

An environmentally friendly, plugging agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of less environmentally friendly plugging agent products, achieve excellent plugging performance, improve heat resistance, reduce Effects of Drilling Accidents

Active Publication Date: 2021-09-07
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

Through continuous efforts, great progress has been made in the environmental protection of drilling fluids over the years, but there are still relatively few good environmental protection plugging agents

Method used

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  • A kind of environment-friendly plugging agent for drilling fluid and preparation method thereof
  • A kind of environment-friendly plugging agent for drilling fluid and preparation method thereof
  • A kind of environment-friendly plugging agent for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0027] 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;

[0028] 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

[0030] 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;

[0031] 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

[0033] 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;

[0034] 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 an environment-friendly plugging agent for drilling fluid, which is prepared from the following raw materials in parts by weight: 40-55 parts of modified starch, 20-30 parts of lignocellulose, and 5-15 parts of antioxidant , 3-10 parts of nano-calcium carbonate and 15-30 parts of dispersant, wherein the antioxidant is 2,5-di-tert-butyl hydroquinone, didodecyl thiodipropionate and hindered phenolic antioxidant One or more of the oxygen agents. The invention also discloses a method of an environment-friendly plugging agent for drilling fluid, which is characterized in that it comprises the following steps: stirring the modified starch and lignocellulose, mixing evenly, and then adding a dispersant, at 65-90°C Stir at high temperature for 90-120min, then add nano-calcium carbonate, stir for 30-50min, heat up to 85-115°C, add antioxidant, stir for 1-1.5h, then cool down to 80±5°C, and keep warm at this temperature React for 4-5 hours, pulverize, and pass through a 60-80 mesh sieve to obtain an environmentally friendly plugging agent for drilling fluid. The invention has the advantages of environmental protection, good plugging effect and low fluorescence intensity.

Description

technical field [0001] The invention relates to the field of additives for drilling fluids, in particular to an environment-friendly plugging agent for drilling fluids and a preparation method thereof. Background technique [0002] During the drilling process, the liquid phase, solid phase particles and other additives in the drilling fluid will leak into the fractured bottom layer, causing damage to the oil and gas reservoir, especially the leakage in the shale formation will cause the wellbore instability, etc. question. In order to prevent solid phase particles from migrating into the formation, the most direct and effective method is to add a plugging agent to the drilling fluid to seal the pores and cracks on the well wall rock, thereby reducing or eliminating the loss of drilling fluid into the formation . [0003] The existing drilling fluid plugging agents mainly include asphalt, paraffin and polyols. With the increasingly severe domestic environmental protection s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C08B31/08C08B31/18
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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