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An anti-collapse drilling fluid imitating salt-tolerant plant cells

A water-based drilling fluid and derivative technology, applied in the field of petroleum drilling engineering, can solve problems such as high cost, strong corrosion, and unenvironmental protection, and achieve the effects of maintaining water, reducing formation hydration, and balancing osmotic pressure

Active Publication Date: 2020-07-14
CHINA PETROCHEMICAL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides an anti-collapse drilling fluid imitating salt-tolerant plant cells. The water-based drilling fluid overcomes the shortcomings of existing drilling fluids such as high cost, strong corrosion, and non-environmental protection, and meets the requirements of well wall stability and environmental protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The components are configured according to the following weight percentages, specifically: 0.01% soda ash, 0.02 caustic soda, 5% bentonite, 0.5% modified starch, 0.1% amino acid and its derivatives, 0.1% sugar, 0.1% small molecule polyol, and the balance It is water, and the anti-slump drilling fluid (1) imitating salt-tolerant plant cells is obtained according to the aforementioned preparation method.

[0019] The anti-slump drilling fluid (1) prepared by imitating salt-tolerant plant cells was further rolled and aged at 80°C for 16 hours, cooled to room temperature and tested for its performance. Specifically, its density is 1.01g / cm 3 , Funnel viscosity 30s, six speeds 21 / 12 / 8 / 6 / 2 / 1, initial and final cut 4 / 7, plastic viscosity 9mPa·s, dynamic shear force 1.5Pa, API filtration loss 7.8ml, filtrate linear expansion coefficient 1.87.

[0020] Wherein, the method for measuring the linear expansion coefficient of the filtrate is as follows: use a linear dilatometer, tak...

Embodiment 2

[0023] The components are configured according to the following weight percentages, specifically: 0.01% soda ash, 0.02 caustic soda, 5% bentonite, 0.5% modified starch, 1.0% amino acid and its derivatives, 0.1% sugar, 0.1% small molecule polyol, 0.01 bactericidal agent, the balance is water, and the salt-tolerant plant cell anti-slump drilling fluid (2) is obtained according to the aforementioned preparation method.

[0024] Further, the anti-slump drilling fluid (2) prepared by imitating salt-tolerant plant cells was rolled and aged at 80°C for 16 hours, cooled to room temperature and tested for its performance. Specifically, its density is 1.01g / cm 3 , Funnel viscosity 31s, six-speed 24 / 13 / 9 / 6 / 2 / 1, initial and final cut 3 / 7, plastic viscosity 11mPa.s, dynamic shear force 1Pa, API filtration loss 3.8ml, filtrate linear expansion coefficient 1.81.

Embodiment 3

[0026] The components are configured according to the following weight percentages, specifically: 0.01% soda ash, 0.02 caustic soda, 5% bentonite, 0.5% modified starch, 1.0% amino acid and its derivatives, 1.0% sugar, 0.1% small molecule polyol, and the balance It is water, and the salt-tolerant plant cell anti-slump drilling fluid (3) is obtained according to the aforementioned preparation method.

[0027] Further, the anti-slump drilling fluid (3) prepared by imitating salt-tolerant plant cells was rolled and aged at 80°C for 16 hours, cooled to room temperature and tested for its performance. Specifically, its density is 1.01g / cm 3 , Funnel viscosity 35s, six-speed 28 / 16 / 9 / 6 / 2 / 1, initial and final cut 3 / 7, plastic viscosity 12mPa.s, dynamic shear force 2Pa, API filtration loss 3.6ml, filtrate linear expansion coefficient 1.65.

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PUM

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Abstract

The invention relates to the technical field of petroleum drilling engineering, especially to a salt-resistant plant cell-like anti-sloughing drilling fluid. The water-based drilling fluid overcomes the disadvantages of high cost, strong corrosivity, environment unfriendliness and the like of conventional drilling fluids and meets requirements for stability of borehole walls and environmental protection. The salt-resistant plant cell-like anti-sloughing drilling fluid comprises, by weight, 0.01 to 0.1% of soda ash, 0.01 to 0.3% of caustic soda, 0 to 15% of bentonite, 0 to 15% of modified starch, 0 to 5% of biopolymer, 0.1 to 15% of amino acids and derivatives thereof, 0.1 to 15% of carbohydrates and 0.1 to 15% of micromolecular polyol, with the balance being water.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling engineering, in particular to an anti-collapse drilling fluid imitating salt-tolerant plant cells. Background technique [0002] With the continuous expansion of oil exploration and development areas, the drilling operations of deep wells and ultra-deep wells are gradually increasing. The outstanding characteristics of deep wells and ultra-deep wells are high downhole temperature and pressure, which will cause great changes in the performance of drilling fluids and easily lead to some downhole complex situations. occur. In recent years, people have done a lot of research work on the overall requirements of drilling fluids such as wellbore stability, reservoir and environmental protection, especially the drilling fluid technology suitable for deep wells, ultra-deep wells and complex areas has made great progress. A series of new drilling fluid systems, such as environment-friendly water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/18
CPCC09K8/18
Inventor 张敬辉郑成胜蓝强张鹏徐运波郝思涵李公让
Owner CHINA PETROCHEMICAL CORP
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