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Low-permeability plugging agent

A plugging agent and low-permeability technology, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of affecting drilling fluid rheology, unfavorable drilling fluid plugging, and unsatisfactory plugging effect, etc. The effect of wellbore stability, prevention of differential pressure sticking, and prevention of lost circulation

Inactive Publication Date: 2014-12-24
ASTAR PETROTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above protective agents and plugging agents all contain high-molecular polymers, which have poor high-temperature stability. Adding them into the drilling fluid will affect the rheology of the drilling fluid, which is not conducive to the plugging of the drilling fluid under high-density conditions, and the gradation is not clear. not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The components and mass ratio of the plugging agent: 70% organic material, 15% high temperature resistant fiber, and 15% surfactant; among them, the organic material is a single pressure blocking agent after processing, and the gradation ratio of the pressure blocking agent is as follows: Single pressure blocking agent (800 mesh): single pressure blocking agent (400 mesh): single pressure blocking agent (80 mesh) = 2:1:2.

[0029] The product can be obtained after the components are mixed evenly;

[0030] Configure the experimental samples according to the following methods and steps:

[0031] (1) 400ml of distilled water, add KCl24.0g under stirring at 11000rpm;

[0032] (2) After KCl is completely dissolved, add 40.0 g of sodium bentonite and 0.4 g of caustic soda in sequence, and stir at high speed for 10 minutes;

[0033] (3) adjust the pH value from 9 to 10;

[0034] (4) Add 1.2g of xanthan gum (XC) and 8.0g of low-permeability plugging agent (LIM), stir at high...

Embodiment 2

[0045] The components and mass ratio of the plugging agent: 70% organic material, 20% high temperature resistant fiber, 10% surfactant; among them, the organic material is a single pressure blocking agent after processing, and the gradation ratio of the pressure blocking agent is as follows: Single pressure blocking agent (800 mesh): single pressure blocking agent (400 mesh): single pressure blocking agent (80 mesh) = 2:1:2.

[0046] The product can be obtained after mixing the components evenly;

[0047] Configure the experimental samples according to the following methods and steps:

[0048] (1) 400ml of distilled water, add KCl24.0g under stirring at 11000rpm;

[0049] (2) After KCl is completely dissolved, add 40.0 g of sodium bentonite and 0.4 g of caustic soda in sequence, and stir at high speed for 10 minutes;

[0050] (3) adjust the pH value from 9 to 10;

[0051] (4) Add 1.2g of xanthan gum (XC) and 8.0g of low-permeability plugging agent (LIM), stir at high speed ...

Embodiment 3

[0062] The components and mass ratio of the plugging agent: 60% organic material, 25% high temperature resistant fiber, 15% surfactant; among them, the organic material is a single pressure blocking agent after processing, and the gradation ratio of the pressure blocking agent is as follows: Single pressure blocking agent (800 mesh): single pressure blocking agent (400 mesh): single pressure blocking agent (80 mesh) = 2:1.5:2.

[0063] The product can be obtained after the components are mixed evenly;

[0064] Configure the experimental samples according to the following methods and steps:

[0065] (1) 400ml of distilled water, add KCl24.0g under stirring at 11000rpm;

[0066] (2) After KCl is completely dissolved, add 40.0 g of sodium bentonite and 0.4 g of caustic soda in sequence, and stir at high speed for 10 minutes;

[0067] (3) adjust the pH value from 9 to 10;

[0068] (4) Add 1.2g of xanthan gum (XC) and 8.0g of low-permeability plugging agent (LIM), stir at high s...

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Abstract

The invention discloses a low-permeability plugging agent which is composed of the following components in percentage by mass: 60-70% of organic material, 15-25% of high-temperature-resistant fiber and 10-15% of surfactant. The low-permeability plugging agent does not have the polymer component, is still available under high-temperature conditions, and does not influence the rheological properties of the drilling fluid in a conventional environment under high-density conditions. By reasonably optimizing the particle size distribution, the low-permeability plugging agent can effectively plug various pore throats and cracks and enhance the stratum loading capacity.

Description

technical field [0001] The invention relates to a treatment agent for drilling fluid, in particular to a low-permeability plugging agent. Background technique [0002] In the process of petroleum exploration and development, lost circulation is the most common complex phenomenon, especially in micro-fractured formations, permeable formations, shale formations, coal seams, fractured zone formations and reservoirs, where wellbore instability and lost circulation risks are high. Increase, in order to drill safely and quickly in such formations, it is necessary to develop a material that can prevent and solve lost circulation in such formations. [0003] Tangshan Jinsha Industry and Trade Co., Ltd. invented a non-penetrating oil layer protection agent (application number: 201210506592.5). The composition and mass percentage of the non-penetrating oil layer protection agent are: single pressure sealant 50%-70%, sodium humate 20%-30%, sodium carboxymethylcellulose 10-20%; Southwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/42
CPCC09K8/035C09K8/426C09K2208/08
Inventor 金承平申威王泽东杨胜张超向小龙谢奇
Owner ASTAR PETROTECH
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