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A kind of plugging and anti-slump agent for drilling fluid and preparation method thereof

A plugging and anti-slump, drilling fluid technology, applied in chemical instruments and methods, chemical processing of tar pitch/petroleum pitch/natural asphalt, drilling compositions, etc., can solve the problem of high fluorescence intensity of plugging and anti-slump problems, to achieve the effect of speeding up the exploration and development process, great adaptability, and improving the quality of the mud cake

Active Publication Date: 2020-12-04
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

Asphalt is currently recognized as an ideal anti-slump agent, but asphalt plugging and anti-slump agents have high fluorescence intensity, which has great restrictions on their application

Method used

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  • A kind of plugging and anti-slump agent for drilling fluid and preparation method thereof
  • A kind of plugging and anti-slump agent for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0026] The preparation method of modified polyvinyl alcohol is as follows: mix and stir polyvinyl alcohol and water with a mass ratio of 1:6, raise the temperature to 90°C, and stir at this temperature for 100 minutes, stop stirring, keep warm at 90°C for 1 hour, and then Cool down to 70°C, then add epoxy resin, stir for 15 minutes, then keep warm at 70°C for 2 hours, and dry to obtain modified polyvinyl alcohol.

preparation example 2

[0028] The preparation method of modified polyvinyl alcohol is as follows: mix and stir polyvinyl alcohol and water with a mass ratio of 1:5, heat up to 80°C, and stir at this temperature for 1.5h, stop stirring, and keep warm at 80°C for 1h, Then lower the temperature to 65°C, then add epoxy resin, stir for 10 minutes, keep warm at 65°C for 2 hours, and dry to obtain modified polyvinyl alcohol.

preparation example 3

[0030] The preparation method of modified polyvinyl alcohol is as follows: mix and stir polyvinyl alcohol and water with a mass ratio of 1:8, raise the temperature to 100°C, and stir at this temperature for 2 hours, stop stirring, keep warm at 100°C for 1 hour, and then Lower the temperature to 75°C, then add epoxy resin, stir for 20 minutes, keep the temperature at 75°C for 2 hours, and dry to obtain modified polyvinyl alcohol.

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PUM

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Abstract

The invention discloses a blocking and anti-collapse agent used for drilling fluid, which is made from sulfonated asphalt, a chelating agent, lignin fibers, polyethylene powder, modified polyvinyl alcohol, nano calcium carbonate, n-pentane and water. The invention also discloses a method for preparing the blocking and anti-collapse agent. The method includes: 1) mixing and stirring the lignin fibers, nano calcium carbonate and 4 / 5 of the sulfonated asphalt for 10-20 min, adding water and the chelating agent, stirring the mixture, and performing a chelating reaction at 40-60 DEG C for 3-4 h; 2)heating the mixture to 80 + / - 5 DEG C, successively adding the polyethylene powder and modified polyvinyl alcohol, stirring the mixture for 40-60 min, and adding the rest of the sulfonated asphalt; 3) stirring the mixture for 20 min and adding the n-pentane, and performing a reaction for 2.5-3 h at 45-55 DEG C and drying the product. The blocking and anti-collapse agent has strong blocking and anti-collapse capability, can improve mud cake quality and reduce filter loss quantity, is low in fluorescence and is free of tackification, can improve lubricating performance of the drilling fluid, isgreat in compatibility with the drilling fluid, and has significant comprehensive effect.

Description

technical field [0001] The invention relates to the field of additives for drilling fluids, more specifically, it relates to a plugging and anti-collapse agent for drilling fluids and a preparation method thereof. Background technique [0002] Well collapse is one of the most serious hazards in oil and gas drilling engineering. Wellbore stability in shale formations in oil and gas drilling has always been an important responsibility of drilling fluids. Years of drilling fluid anti-collapse technology research has shown that wellbore instability is closely related to the invasion of drilling fluid filtrate in the wellbore. Preventing the penetration of drilling fluid filtrate into the shale well wall is the key point of drilling fluid anti-collapse technology. Although the filter cake of drilling fluid can greatly reduce the penetration rate and percolation rate of wellbore drilling fluid into formation pores or fractures, the filter cake formed by the action of drilling fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C08G81/02C10C3/02
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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