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Preparation method of inorganic bentonite for drilling fluid

A technology of inorganic bentonite and drilling fluid, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of less research and achieve the effects of improving the performance of bentonite, reducing production costs, and optimizing processing technology

Inactive Publication Date: 2017-12-08
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few related studies on the preparation of OCMA-grade inorganic drilling fluid bentonite from unpurified low-grade calcium-based bentonite.

Method used

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  • Preparation method of inorganic bentonite for drilling fluid

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Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of inorganic bentonite for drilling fluid, specifically comprising the following steps:

[0027] (1), take Na 2 CO 3 Mix well with complexing agent to make composite sodiumizing agent (Na 2 CO 3 The mass ratio to the complexing agent is 20:1, and the complexing agent is sodium nitrilotriacetate), the low-grade calcium-based bentonite (the content of montmorillonite is 60%) is crushed and passed through a 200-mesh sieve, and the compound sodiumizing agent is added (The weight ratio of low-grade calcium-based bentonite and composite sodium agent is 25:1), stir evenly to obtain a mixture, then dissolve the mixture in water (the weight ratio of mixture to water is 1:5), and adjust with caustic soda pH to 12, stir evenly, get mud, set aside;

[0028] (2), add inorganic composite suspending agent to the mud prepared in step (1) (the addition of inorganic composite suspending agent is 1 / 25 of the weight of the mixture in step (1), and the inorganic com...

Embodiment 2

[0030] A preparation method of inorganic bentonite for drilling fluid, specifically comprising the following steps:

[0031] (1), take Na 2 CO 3 Mix well with complexing agent to make composite sodiumizing agent (Na 2 CO 3 The mass ratio to the complexing agent is 15:1, and the complexing agent is ethylenediaminetetraacetic acid salt), and the low-grade calcium-based bentonite (the content of montmorillonite is 68%) is crushed and passed through a 200-mesh sieve, and added to the compound Sodiumizing agent (the weight ratio of low-grade calcium-based bentonite and composite sodiumizing agent is 25:1), stir evenly to obtain a mixture, then dissolve the mixture in water (the weight ratio of mixture and water is 1:9), and use Adjust the pH to 13 with caustic soda, stir evenly to obtain mud, and set aside;

[0032] (2), add inorganic composite suspending agent to the mud prepared in step (1) (the addition of inorganic composite suspending agent is 1 / 25 of the weight of the mix...

Embodiment 3

[0034] A preparation method of inorganic bentonite for drilling fluid, specifically comprising the following steps:

[0035] (1), take Na 2 CO 3 Mix well with complexing agent to make composite sodiumizing agent (Na 2 CO 3 The mass ratio to the complexing agent is 12:1, and the complexing agent is sodium ethylenediamine tetramethylene phosphate), and the low-grade calcium-based bentonite (the content of montmorillonite is 75%) is crushed and passed through a 200-mesh sieve, and added Composite sodium agent (the weight ratio of low-grade calcium-based bentonite and composite sodium agent is 25:1), stir evenly to obtain a mixture, and then dissolve the mixture in water (the weight ratio of mixture to water is 1:12), And use caustic soda to adjust the pH to 12, stir evenly to obtain mud, and set aside;

[0036] (2), add inorganic composite suspending agent to the mud prepared in step (1) (the addition of inorganic composite suspending agent is 1 / 25 of the weight of the mixtur...

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Abstract

The invention relates to a preparation method of inorganic bentonite for drilling fluid. The preparation method specifically comprises the following steps: (1) taking low-grade calcium-based bentonite for crushing, adding a composite sodium agent into the bentonite, uniformly mixing to obtain a mixture, dissolving the mixture into water, regulating the pH value to be greater than or equal to 12 by caustic soda, and uniformly stirring, thereby obtaining mud for later use; (2) adding an inorganic composite suspending agent into mud prepared in the step (1), uniformly stirring, then adding polymerized sulfate to enable the pH value of the mud to be 7-10, filtering after uniformly stirring, taking precipitates to remove water to obtain the inorganic bentonite for the drilling fluid. According to the preparation method disclosed by the invention, the low-grade calcium-based bentonite is adopted to prepare OCMA-grade inorganic bentonite for the drilling fluid, so that a low-grade bentonite purifying step is omitted, a processing process of inorganic pulping bentonite is optimized, an organic high polymer material is not added in a preparation process, production cost of the bentonite is reduced, and the product pulping rate is high, so that the high-additional-value utilization of low-grade bentonite resources is realized.

Description

technical field [0001] The invention relates to the technical field of low-grade bentonite modification, in particular to a preparation method of inorganic bentonite for drilling fluid. Background technique [0002] With the development of industry, the demand for bentonite in oil drilling and horizontal directional drilling industry at home and abroad is increasing year by year. my country is rich in bentonite resources, the reserves rank first in the world, but most of them are low-grade calcium-based bentonite, and the content of montmorillonite is between 60% and 80%. GB / T 5005-2010 divides drilling fluid bentonite into 3 categories, namely untreated bentonite, drilling grade bentonite and OCMA grade bentonite. Among them, drilling bentonite and OCMA grade bentonite are added with various chemical synergists, and it is difficult for untreated bentonite to meet the use requirements. [0003] At present, low-grade calcium-based bentonite is used at home and abroad to pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03
CPCC09K8/032
Inventor 陈华军刘萍李冬田文杰杨刚宾赵莉
Owner LUOYANG INST OF SCI & TECH
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