Environment-friendly chlorine-free drilling fluid and preparation method thereof

A chlorine-free drilling fluid technology, applied in the field of drilling fluid, can solve the problems of failing to meet sewage discharge standards, plants not growing, polluting groundwater, etc., achieving low pumping and exciting pressure, saving drilling cycle, and strong inhibition Effect

Inactive Publication Date: 2016-01-20
中国石油集团川庆钻探工程有限公司长庆钻井总公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive Cl - Concentration, causing soil compaction, unable to grow plants, polluting groundwater, and failing to meet the sewage discharge standards in local environmental protection laws

Method used

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  • Environment-friendly chlorine-free drilling fluid and preparation method thereof
  • Environment-friendly chlorine-free drilling fluid and preparation method thereof
  • Environment-friendly chlorine-free drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] An environment-friendly chlorine-free drilling fluid is characterized in that it is composed according to the mass ratio of the following components:

[0040] Chlorine-free strong inhibitory compound salt, 8-18%, function: no chlorine, good environmental protection, improve the environmental protection of the system, increase the density, improve the chemical inhibition and anti-slump effect of drilling fluid, form a film on the well wall and reduce the drilling fluid activity;

[0041] Drilling fluid viscosity raising agent, 0.2-0.3%, function: increase drilling fluid viscosity and improve sand-carrying ability;

[0042] Water-dispersed cationic emulsified asphalt powder, 1.5-3%, function: form a hard and smooth mud cake, with good plugging ability above the softening point;

[0043] Anti-salt and anti-calcium fluid loss reducer, 0.2-0.4%, function: easy to degrade, good environmental protection, sticky, wall protection, forming smooth and dense mud cake;

[0044] Na...

Embodiment 2

[0055] What the chlorine-free strong inhibitory compound salt that used in the present embodiment adopted is the model that the Xi'an Changqing chemical industry produces is the chlorine-free strong inhibitory compound salt of CQFY-1;

[0056] The drilling fluid viscosity raising agent is the model PAC-HV drilling fluid viscosity raising agent produced by Xi'an Changqing Chemical Industry Co., Ltd.;

[0057] The water-dispersed cationic emulsified asphalt powder adopts the water-dispersed cationic emulsified asphalt powder of the model SFT-1 produced by Henan Jinma;

[0058] The anti-salt and anti-calcium fluid loss additive is JT-1 anti-salt and anti-calcium fluid loss additive produced by Henan Jinma;

[0059] The natural fluid loss control agent is the natural polymer fluid loss control agent of the model NAT-20 produced by Beijing Peikang;

[0060] The acid-soluble temporary plugging reservoir protection agent adopts the acid-soluble temporary plugging reservoir protectio...

Embodiment 3

[0096] A preparation method of chlorine-free drilling fluid, carried out according to the following steps:

[0097] Step 1. After spud drilling, add carboxymethyl cellulose sodium salt with a mass ratio of 0.2%, oxidized bitumen with a mass ratio of 3%, carboxymethyl starch with a mass ratio of 0.4%, and A mixture of 0.2% safflower gum, 4% ultrafine calcium and limestone, cyclically drilled for 8 hours;

[0098] Step 2, adding a mixture of potassium formate and sodium formate and 0.1% caustic soda NaOH with a mass ratio of 8% in the wellbore of step 1, and continue drilling;

[0099] Step 3: Continue to add the mixture of potassium formate and sodium formate into the wellbore during the drilling process. When the well deviation is 30°, the density of the drilling fluid reaches 1.15g / cm 3 ;

[0100] Step 4: Continue drilling until the well deviation is 45° and the density of the drilling fluid is 1.25g / cm 3 , the mass ratio of the mixture of potassium formate and sodium form...

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Abstract

The invention relates to environment-friendly chlorine-free drilling fluid, which is characterized in that the environment-friendly chlorine-free drilling fluid is prepared from the following components in percentages by weight: 8 to 18 percent of chlorine-free strongly inhibitory compound salt; 0.2 to 0.3 percent of drilling fluid tackifier; 1.5 to 3 percent of water-dispersible cationic emulsified asphalt powder; 0.2 to 0.4 percent of salt-resistant and calcium-resistant filtrate reducer; 0.2 to 0.5 percent of natural polymer filtrate reducer; 2 to 4 percent of acid-soluble temporarily plugged reservoir protection agent; 0.1 percent of caustic soda; and the balance of clean water. The environment-friendly, chlorine-free, low-density, low-solid phase, strong-chemical inhibition and anti-collapse drilling fluid can inhibit the collapse of mudstone sections under the condition of low density, and meets the friction drag reduction of long open hole sections with low solid phase.

Description

technical field [0001] The invention relates to the technical field of drilling fluids in the exploration and development of oil and natural gas, in particular to a chlorine-free drilling fluid for gas wells and a preparation method thereof. Background technique [0002] Environmental protection is one of the most important issues in the world today. With the continuous improvement of human living standards, the awareness of environmental protection is increasing day by day. Whether the drilling fluid will cause toxic pollution to the environment, especially the groundwater during the drilling process, and whether the discharge of the drilling fluid after the drilling operation will cause toxic pollution to the environment are receiving special attention. Drilling fluid has become the primary object of environmental protection monitoring in drilling construction, and has become a bottleneck restricting the development and utilization of resource drilling. [0003] The origi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/10
CPCC09K8/10C09K2208/08C09K2208/34
Inventor 朱明明卢逍胡祖彪陈华王清臣吴付频王伟良南红军刘朝峰
Owner 中国石油集团川庆钻探工程有限公司长庆钻井总公司
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