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A kind of clay inhibitor for drilling fluid and preparation method thereof

A technology of clay inhibitor and drilling fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of wellbore trajectory deviation, tripping resistance, and scrapping of the whole well, so as to reduce dynamic Cutting force, reduce trouble, improve the effect of drilling speed

Active Publication Date: 2021-11-09
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

Well collapse and shrinkage caused by well wall instability will not only lead to downhole complications such as tripping resistance, drill sticking, increased torque, and pump holding, but will even cause drilling tools to drop, wellbore trajectory to deviate well scrapping

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1-3

[0031] Wherein, the nano-hydroxide aluminum is prepared by the following preparation example 1-10 of the nano-hydroxide aluminum, and the sulfonated nitrohumic acid is prepared by the following preparation example 1-3 of the sulfonated nitrohumic acid;

[0032] Inorganic salts include one or more of sodium chloride, potassium chloride or ammonium chloride, preferably potassium chloride;

[0033] Polyacrylamide is a cationic polyacrylamide with a number-average molecular weight of 3-15 million, purchased from North Qingmiao (Beijing) Environmental Protection Technology Co., Ltd.;

[0034]The lignosulfonate is calcium lignosulfonate with a number average molecular weight of 800-10000, purchased from Jinan Zhongwei Chemical Co., Ltd., the brand is Zhongwei, and the model is industrial grade.

preparation example 1

[0037] A preparation method of nano aluminum hydroxy, comprising the following steps: mixing 90 g of sodium metaaluminate and sulfuric acid with a mass fraction of 30% at 15°C, the pH value of the mixed solution is 6, and then adding 2 times the volume of the obtained mixed solution The water of the mixed solution was stirred and mixed, then left to stand for 25 minutes, and the supernatant was removed to obtain hydrated alumina;

[0038] Stirring the liquid sodium aluminate with a mass percentage of 40% at a rotational speed of 220rmp for 22h to obtain aluminum hydroxide nanomicelles;

[0039] Mix aluminum hydroxide nano-micelles and hydrated alumina according to the mass ratio of 1:1, then add sodium sulfate with a mass fraction of 40%, stir, control the pH of the resulting mixed liquid to 6, filter with suction, and keep the temperature at 220°C Stand for 5.5h to get nano-hydroxide aluminum.

[0040] Among them, liquid sodium aluminate was purchased from Shandong Lier New ...

preparation example 2

[0042] A method for preparing nano aluminum hydroxy, comprising the following steps: mixing 90 g of sodium metaaluminate and sulfuric acid with a mass fraction of 30% at 15°C, the pH of the mixed solution is 5, and then adding 2 times the volume of the mixed solution to the obtained mixed solution The water of the mixed solution was stirred and mixed, then left to stand for 25 minutes, and the supernatant was removed to obtain hydrated alumina;

[0043] Stirring the liquid sodium aluminate with a mass percentage of 40% at a rotational speed of 220rmp for 22h to obtain aluminum hydroxide nanomicelles;

[0044] Mix aluminum hydroxide nano-micelles and hydrated alumina according to the mass ratio of 1:1, then add sodium sulfate with a mass fraction of 40%, stir, control the pH of the resulting mixed liquid to 6, filter with suction, and keep the temperature at 220°C Stand for 5.5h to get nano-hydroxide aluminum.

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PUM

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Abstract

The invention discloses a clay inhibitor for drilling fluid and a preparation method thereof. The clay inhibitor is made of the following raw materials in parts by weight: 40-80 parts of nano-hydroxide aluminum, 30-60 parts of inorganic salt, 70-120 parts Polyacrylamide, 5-10 parts of ferrous chloride or ferrous sulfate, 50-100 parts of sulfonated nitrohumic acid, 20-50 parts of lignosulfonate and 8-15 parts of potassium chlorate; its preparation method is: Mix and stir sulfonated nitrohumic acid, lignosulfonate, potassium chlorate, ferrous chloride or ferrous sulfate, react at 80-100°C for 1-1.5h, then adjust the temperature to 35-40°C, adjust The pH value is 9-11, then adding nano-hydroxide aluminum and inorganic salts in sequence, stirring for 20-30 minutes, adding polyacrylamide, and stirring at 50-60°C for 2-3 hours to prepare an inhibitor for clay. The invention has the advantages that the prepared clay inhibitor can be applied to water-based drilling fluid, has a strong ability to inhibit clay hydration expansion, and can alleviate the phenomenon of well wall instability.

Description

technical field [0001] The invention relates to the technical field of additives for drilling fluids, more specifically, it relates to a clay inhibitor for drilling fluids and a preparation method thereof. Background technique [0002] In the process of oil and gas drilling, the worldwide problem of wellbore instability in shale formations has been perplexing the vast number of petroleum engineering technicians. Well collapse and borehole shrinkage caused by well wall instability will not only lead to downhole complications such as tripping resistance, drill sticking, increased torque, pump holding, etc. Well scrapping. [0003] As the state has intensified its exploration and development of shale gas resources in recent years, the wellbore stability is facing more severe challenges. Although currently oil-based drilling fluids are usually used in shale gas drilling to alleviate wellbore instability, from the perspective of economic development benefits and environmental p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/12
Inventor 卢新玉曹何山卢长征沈勤长
Owner 北京宏勤石油助剂有限公司
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