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Drilling fluid as well as preparation method and application thereof

A drilling fluid and coating agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of restricting drilling speed increase, hidden dangers of electrical testing of borehole wall completion, etc., and achieve reduction of cuttings holding effect, Excellent shear thinning property and low production cost

Inactive Publication Date: 2020-05-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the problem of wellbore instability in shale formations has also brought huge hidden dangers to completion electrical logging, casing running, and cementing, which seriously restricts drilling speed.

Method used

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  • Drilling fluid as well as preparation method and application thereof
  • Drilling fluid as well as preparation method and application thereof
  • Drilling fluid as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0054] figure 1 Be the flow chart of drilling fluid preparation method of the present invention, as figure 1 Shown, the present invention provides a kind of preparation method of above-mentioned any drilling fluid, comprises the following steps:

[0055] S101: performing prehydration treatment on bentonite under normal temperature and pressure to obtain bentonite slurry;

[0056] S102: After mixing bentonite slurry with water to prepare drilling fluid base slurry, add sodium hydroxide, polymer coating agent, polymer fluid loss reducer, gelling agent, film forming agent, Collapsing agent, emulsified liquid paraffin, amino-modified polyether polyol, potassium chloride, and lubricant to obtain an intermediate product;

[0057] S103: Add limestone powder to the intermediate product until the density of the product system is 1.1-1.3g / cm 3 Finally, stir evenly to obtain drilling fluid.

[0058] At the beginning of the preparation, the bentonite needs to be prehydrated, that is, ...

Embodiment 1

[0074] The drilling fluid of the present embodiment comprises the following components according to mass percentage:

[0075] Bentonite: 4%

[0076] Sodium hydroxide: 0.2%

[0077] Potassium polyacrylamide: 0.4%

[0078] Vinyl monomer / cellulose graft copolymer: 1.5%

[0079] Highly cross-linked modified starch: 0.5%

[0080] Film former: 1%

[0081] White asphalt: 2%

[0082] Emulsified liquid paraffin: 1.0%

[0083] Amino-modified polyether polyol: 1.0%

[0084] Potassium chloride: 6%

[0085] Fatty alcohol compounds: 2%

[0086] Limestone powder: 41.5%

[0087] The balance is water

[0088] The density of the above-mentioned drilling fluid is 1.27g / cm 3 .

[0089] The preparation method of the drilling fluid of the present embodiment may further comprise the steps:

[0090] 1. Under normal temperature and pressure, pre-hydrate bentonite to obtain bentonite slurry;

[0091] 2. According to the requirements of drilling fluid components, a certain amount of benton...

Embodiment 2

[0094] The drilling fluid of the present embodiment comprises the following components according to mass percentage:

[0095] Bentonite: 4%

[0096] Sodium hydroxide: 0.2%

[0097] Potassium polyacrylamide: 0.2%

[0098] Acrylamide and sodium acrylate copolymer coating agent (80A51): 0.2%

[0099] Vinyl monomer / cellulose graft copolymer: 1.5%

[0100] Highly cross-linked modified starch: 0.5%

[0101] Film former: 1%

[0102] Oxidized bitumen: 2%

[0103] Emulsified liquid paraffin: 1%

[0104] Amino-modified polyether polyol: 1%

[0105] Potassium chloride: 6%

[0106] Fatty alcohol compounds: 2%

[0107] Limestone powder: 41.5%

[0108] The balance is water.

[0109]The density of the above-mentioned drilling fluid is 1.27g / cm 3 .

[0110] The preparation method of the drilling fluid of the present embodiment may further comprise the steps:

[0111] 1. Under normal temperature and pressure, pre-hydrate bentonite to obtain bentonite slurry;

[0112] 2. Accordin...

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Abstract

The invention provides a drilling fluid as well as a preparation method and application thereof. The drilling fluid is prepared from the following components in percentage by mass: 2-5% of bentonite,0.1-0.2% of sodium hydroxide, 0.2-0.9% of a polymer coating agent, 1-2% of a polymer filtrate reducer, 0.2-1% of a gelatinizing agent, 1-2% of a film-forming agent, 1-3% of an asphalt anti-collapse agent, 0.5-2% of emulsified liquid paraffin, 1-3% of amino modified polyether polyol, 3-7% of potassium chloride, 1-3% of a lubricant and 8-50% of limestone powder, and the balance being water. The density of the drilling fluid is 1.1-1.3 g / cm<3>. When the drilling fluid is used for drilling, the drilling speed can be increased, the purposes of stabilizing the wall of a shale stratum and reducing the pressing effect of rock debris can be achieved, and the drilling fluid is particularly suitable for drilling of a shale-containing stratum.

Description

technical field [0001] The invention relates to a drilling fluid, a preparation method and application thereof, and belongs to the technical field of petroleum exploitation. Background technique [0002] Drilling speed increase is the requirement of exploration and development for drilling, so as to achieve the maximum return with the least investment, and achieve the purpose of saving drilling costs and maximizing profits. Due to the development of micro-fractures in shale formations and the fact that clay minerals are easy to absorb water and swell, problems such as bit bagging, formation collapse, and resistance and sticking during tripping are prone to occur during drilling. At the same time, the problem of wellbore instability in shale formations has also brought huge hidden dangers to work such as completion electrical logging, casing running, and well cementing, which seriously restricts drilling speed. [0003] Drilling fluid is the blood of drilling engineering, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/514C09K8/512
CPCC09K8/03C09K8/514C09K8/512C09K2208/12C09K2208/10
Inventor 陈军舒小波韩剑发
Owner PETROCHINA CO LTD
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