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A kind of drilling fluid and a kind of preparation method of drilling fluid

A technology of drilling fluid and clay inhibitor, which is applied in the field of oil and gas field drilling, can solve the problems of difficult adjustment of density, high cost and inapplicability to multi-pressure systems, etc., and achieves the effects of easy density adjustment, improved pressure bearing capacity, and simple preparation equipment.

Active Publication Date: 2016-01-20
CHINA UNITED COALBED METHANE NAT ENGRES CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a drilling fluid, which can solve the problems of high cost, difficult adjustment of density and unsuitability for multi-pressure system formations in the existing nitrogen foam and foam plugging fluid
[0006] The present invention also provides a method for preparing drilling fluid. The drilling fluid prepared by the method can solve the existing problems of high cost of nitrogen foam and foam plugging fluid, difficult adjustment of density, and unsuitability for multi-pressure system formations.

Method used

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  • A kind of drilling fluid and a kind of preparation method of drilling fluid
  • A kind of drilling fluid and a kind of preparation method of drilling fluid
  • A kind of drilling fluid and a kind of preparation method of drilling fluid

Examples

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Embodiment 1

[0107] The composition in the drilling fluid in the present embodiment is: the water of N gram, N is a positive number; The anhydrous sodium carbonate of 0.001N gram; The sodium hydroxide of 0.001N gram; The fluid loss reducer of 0.005N gram; The mass ratio of carboxymethyl starch and polyanionic cellulose in the water preparation is 3:1; The tackifier of 0.005N gram; The mass ratio of xanthan gum, hydroxypropyl guar gum and oxygen scavenger in this tackifier is 2:3:5; 0.001N grams of foaming agent, the foaming agent sodium dodecyl sulfonate, polyoxyethylene octylphenol ether, dodecyl dimethyl ammonium oxide and lauryl sulfuric acid The mass ratio of triethanol ammonium salt is 1:1:1:1; 0.001N grams of foam stabilizer, the mass ratio of triethanolamine, ethanol and dodecyl alcohol in the foam stabilizer is 1:1:1; 0.03N grams A clay inhibitor, the clay inhibitor is potassium chloride; 0.01N gram of temperature stabilizer, the temperature stabilizer is a low molecular polymer st...

Embodiment 2

[0111] The composition of the drilling fluid in this example is: N grams of water, N is a positive number; 0.001N grams of anhydrous sodium carbonate; 0.001N grams of sodium hydroxide; 0.006N grams of fluid loss reducer; The mass ratio of carboxymethyl starch and polyanionic cellulose in the water preparation is 4:1; 0.008N grams of tackifier; the mass ratio of xanthan gum, hydroxypropyl guar gum and oxygen scavenger in the tackifier is 3: 2: 5; 0.002N g of a foaming agent containing sodium dodecyl sulfonate, polyoxyethylene octyl phenol ether, dodecyl dimethyl ammonium oxide and dodecyl sulfuric acid The mass ratio of triethanolammonium salt is 2:1:1:1; 0.002N g of foam stabilizer, and the mass ratio of triethanolamine, ethanol and dodecanol in the foam stabilizer is 1:1:2; 0.04N g 0.02N gram of temperature stabilizer, which is low molecular polymer stabilizer; 0.002N gram of bactericide, which is glutaraldehyde.

[0112] Wherein the value of N is 400, in this embodiment, th...

Embodiment 3

[0115] The composition of the drilling fluid in this example is: N grams of water, N is a positive number; 0.001N grams of anhydrous sodium carbonate; 0.001N grams of sodium hydroxide; 0.008N grams of fluid loss reducer; The mass ratio of carboxymethyl starch and polyanionic cellulose in the water preparation is 5:1; 0.01N grams of tackifier; the mass ratio of xanthan gum, hydroxypropyl guar gum and oxygen scavenger in the tackifier is 4: 1: 5; 0.003N g of a foaming agent containing sodium dodecyl sulfonate, polyoxyethylene octyl phenol ether, dodecyl dimethyl ammonium oxide and dodecyl sulfuric acid The mass ratio of triethanolammonium salt is 3:1:1:1; 0.003N g of foam stabilizer, and the mass ratio of triethanolamine, ethanol and dodecanol in the foam stabilizer is 1:1:2; 0.05N g 0.03N gram of temperature stabilizer, which is low molecular polymer stabilizer; 0.003N gram of bactericide, which is glutaraldehyde.

[0116] Wherein the value of N is 400, in this embodiment, the...

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Abstract

The invention discloses drilling fluid and a preparation method thereof. The drilling fluid disclosed by the invention comprises the following components of: Ng of water, 0.001Ng of anhydrous sodium carbonate, 0.001Ng of sodium hydroxide, 0.005Ng-0.01Ng of fluid loss agent, 0.005Ng-0.01Ng of tackifier, 0.001Ng-0.004Ng of foaming agent and 0.001Ng-0.004Ng of foam stabilizer, wherein N is a positive number. The drilling fluid disclosed by the invention can be used for solving the problems that the traditional nitrogen foam and foam leaking stoppage fluid are high in cost and difficult for adjusting density and is suitable for the strata problem of a multi-pressure system.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling in the petroleum industry, in particular to a drilling fluid and a preparation method of the drilling fluid. Background technique [0002] Drilling fluid is one of the necessary materials for balancing formation pressure and ensuring safe and smooth drilling during drilling. During the drilling process, when the formation pressure is lower than the liquid column pressure, there will be a loss of circulation in which a large amount of working fluids such as drilling fluid, completion fluid, and workover fluid leak into the formation. Leakage can cause downhole accidents or complex situations, resulting in prolonged construction time, increased operating costs, and even the scrapping of oil and gas wells, resulting in serious waste of resources and huge economic losses. At present, most of the oil and gas fields are in the middle and late stages of development, and the leakage is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12
Inventor 王德桂何宝杰
Owner CHINA UNITED COALBED METHANE NAT ENGRES CENT