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A kind of water-based drilling fluid for shale gas horizontal well strengthening borehole wall and its application

A water-based drilling fluid and technology for horizontal wells, which are applied in wellbore/well components, earthwork drilling, drilling compositions, etc., can solve the problem of difficult to meet the technical requirements of shale gas horizontal well drilling engineering and shale inhibition performance In addition to the problems of insufficient extreme pressure lubrication performance, instability of the horizontal well section, and wellbore leakage, it can achieve the effects of good monodispersity and water resistance, clean surface, resistance to pressure transmission and filtrate invasion.

Active Publication Date: 2018-03-02
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Oil-based drilling fluid has the advantages of excellent inhibition, lubricity, and high-temperature stability. It is currently the preferred drilling fluid for shale gas horizontal well sections. However, its preparation cost is high and there are environmental protection problems. Well leakage problems will inevitably cause major economic losses
Water-based drilling fluids have the advantages of low cost and environmental friendliness. However, in the drilling of shale gas horizontal wells, conventional water-based drilling fluids are difficult to solve the problems of wellbore instability and wellbore leakage in horizontal wells, and there are shale inhibition properties. It is difficult to meet the engineering technical requirements of shale gas horizontal well drilling due to shortcomings such as insufficient extreme pressure lubrication performance

Method used

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  • A kind of water-based drilling fluid for shale gas horizontal well strengthening borehole wall and its application
  • A kind of water-based drilling fluid for shale gas horizontal well strengthening borehole wall and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A water-based drilling fluid for strengthening the borehole wall of a shale gas horizontal well that is not aggravated includes the following components by weight:

[0048] Fresh water: 100 parts; bentonite: 1.0 parts; micronano particle blocking agent: 1.0 parts; chemical blocking agent: 2.0 parts; viscosifier: 0.3 parts; cationic starch: 1.5 parts; cationic polyacrylamide: 0.1 parts; Strong amine inhibitor: 3.0 parts; extreme pressure lubricant: 1.0 part; sodium hydroxide: 0.1 part; sodium chloride: 20 parts.

[0049] The micro-nano particle plugging agent is prepared as follows:

[0050] Add 200mL of distilled water to a reaction kettle equipped with a stirrer, a thermometer and a heating device, add 100mL of acetone, 12.3g of methyl methacrylate, and 9.6g of styrene while stirring, and stir at a high speed of 1500r / min to form a stable dispersion system. Heating to a temperature of 70°C, adding 0.08 g of potassium persulfate, reacting for 2.5 hours, and cooling natur...

Embodiment 2

[0054] The preparation density is 1.2g / cm 3 The water-based drilling fluid for strengthening the borehole wall of shale gas horizontal wells includes the following components by weight:

[0055] Fresh water: 100 parts; bentonite: 1.0 parts; micro-nano particle blocking agent: 1.5 parts; chemical blocking agent: 2.0 parts; viscosifier: 0.2 parts; low-viscosity polyanionic cellulose: 1.5 parts; parts; strong polyamine inhibitor: 3.0 parts; extreme pressure lubricant: 2.0 parts; sodium hydroxide: 0.1 parts; sodium chloride: 20 parts; barite: 30 parts.

[0056] The micro-nano particle plugging agent is prepared as follows:

[0057] Add 300mL of distilled water to a reaction kettle equipped with a stirrer, a thermometer and a heating device, add 150mL of acetone, 16.7g of n-butyl acrylate, and 11.2g of vinyl acetate while stirring, and stir at a high speed of 1000r / min to form a stable dispersion system. Heating to a temperature of 85°C, adding 0.12 g of azobisisoheptanonitrile, ...

Embodiment 3

[0061] The preparation density is 2.0g / cm 3 The water-based drilling fluid for strengthening the borehole wall of shale gas horizontal wells includes the following components by weight:

[0062] Fresh water: 100 parts; bentonite: 1.0 parts; micro-nano particle plugging agent: 2.0 parts; chemical plugging agent: 2.0 parts; viscosifier: 0.1 parts; sulfonated bitumen: 2.5 parts; Strong polyamine inhibitor: 2.0 parts; extreme pressure lubricant: 2.0 parts; solid lubricant: 1.0 parts; sodium hydroxide: 0.1 parts; potassium chloride: 5.0 parts; compound formate: 70 parts; barite: 100 copies.

[0063] The micro-nano particle plugging agent is prepared as follows:

[0064] Add 250mL of distilled water to a reaction kettle equipped with a stirrer, a thermometer and a heating device, add 130mL of isopropanol, 12.3g of ethyl methacrylate, and 9.6g of styrene while stirring, and stir at a high speed of 2000r / min to form a stable dispersion system , heated in a water bath to a temperatu...

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Abstract

The invention relates to a water-based drilling fluid of a shale gas horizontal well reinforced well wall and an application thereof. The water-based drilling fluid comprises, by weight, 100 parts of water, 0-5 parts of clay, 0.5-3 parts of micro-nano particle blocking agents, 0.5-3 parts of chemical blocking agents, 0.1-2 parts of tackifier, 1-5 parts offiltrate reducer, 0.05-2 parts of encapsulating inhibiting agents, 0.1-3 parts of polyamine inhibiting agents, 1-5 parts of lubricant, 0.1-1 part of alkalinity regulator, 2-25 parts of inorganic salt, and 0-200 parts of weighting agents. The micro-nano particle blocking agents and the chemical blocking agents in the water-based drilling fluid of the shale gas horizontal well reinforced well wall have the effect of reinforcing the well wall in a cooperative mode, can effectively block micropore seams of shale to hinder pressure transmission, can further obviously improve the membrane efficiency of the shale, and facilitates the balance anti-collapse function of chemical activity.

Description

technical field [0001] The invention relates to a shale gas horizontal well wall strengthening drilling fluid and its application, in particular to a high-performance water-based drilling fluid that can replace oil-based drilling fluid. Background technique [0002] my country's shale gas resource prediction technology recoverable reserves reach 10.3×10 12 ~47.0×10 12 m 3 , has a good prospect for exploration and development. Once the large-scale exploration and development is successful, it can effectively alleviate the contradiction between oil and gas supply and demand in my country. Therefore, shale gas exploration and development has become a major national strategy in the "Twelfth Five-Year Plan". [0003] At this stage, horizontal drilling technology is one of the core technologies for shale gas development and is widely used in shale gas development drilling. In order to increase production by hydraulic fracturing in the later stage, horizontal well sections are m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24C09K8/575E21B49/00
CPCC09K8/12C09K8/24C09K8/5083C09K2208/10
Inventor 赵欣邱正松刘均一林永学黄维安王伟吉暴丹张世锋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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