Shale gas development oil-base drilling fluid mud cake cleaning solution

An oil-based drilling fluid and cleaning fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as difficulties, affect cementing quality, and cementing failures, and achieve changes in water wetting conditions and improve The effect of cementing quality and wide adjustable range

Active Publication Date: 2014-02-19
JINGZHOU JIAHUA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the wellbore drilled with oil-based drilling fluid, a layer of dense oil-based drilling fluid mud cake will be formed on the well wall. If the mud cake is not completely removed, it will lead to poor cementation between the cement slurry and the well wall, which will affect the cementing. Quality, or even cementing failure, leading to problems such as oil an

Method used

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  • Shale gas development oil-base drilling fluid mud cake cleaning solution
  • Shale gas development oil-base drilling fluid mud cake cleaning solution

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Embodiment 1

[0021] A shale gas development oil-based drilling fluid mud cake cleaning solution provided by the present invention, wherein the weight percentage of each component is: cleaning agent: 20%; water: 80%;

[0022] Described cleaning agent is made up of nonionic surfactant and mutual solvent, and the weight ratio of nonionic surfactant and mutual solvent is 1:3;

[0023] The nonionic surfactant is a combination of fatty acid polyoxyethylene ether and alkylphenol polyoxyethylene ether, and the weight ratio is 1:1;

[0024] The mutual solvent is used in combination of methanol and diethylene glycol monobutyl ether, and the weight ratio is 1:1.

Embodiment 2

[0026] A shale gas development oil-based drilling fluid mud cake cleaning solution provided by the present invention, wherein the weight percentage of each component is: cleaning agent: 10%; weighting agent: 40%; water: 50%;

[0027] Described cleaning agent is made up of nonionic surfactant and mutual solvent, and the weight ratio of nonionic surfactant and mutual solvent is 1:1;

[0028] The non-ionic surfactant is a combination of allyl alcohol polyoxyalkyl ether, fatty acid polyoxyethylene ester, and stearic acid polyoxyethylene ester, and the weight ratio is 1:1:1;

[0029] Described mutual solvent is the composite use of methanol, isopropanol, and weight ratio is 1:1;

[0030] The weighting agent is ultrafine iron ore powder with a density of 5.02g / cm 3 , the particle size is 1200 mesh.

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Abstract

The invention relates to a shale gas development oil-base drilling fluid mud cake cleaning solution and belongs to the technical field of petroleum drilling engineering chemical agents. The shale gas development oil-base drilling fluid mud cake cleaning solution is characterized by comprising the following components in percentage by weight: 10 percent to 30 percent of a cleaning agent, 0 percent to 60 percent of a weighting agent and the balance of water, wherein the cleaning agent consists of nonionic surfactants and mutual solvents; the weight ratio of the nonionic surfactants to the mutual solvents is 1:9 to 9:1; the nonionic surfactants are polyoxyethylene ether, polyoxyethylene aliphatic ester, polypropylene oxide aliphatic ester and the like; the mutual solvents are methyl alcohol, ethanol, isopropanol and the like; the weighting agent is superfine iron ore powder and has density of 4.90 to 5.20 g/cm<3>. The cleaning solution disclosed by the invention has low viscosity, can form turbulence displacement, can effectively clear away oil-base slurry and mud cakes attached on a well wall and change the water wetting condition of the well wall, and has the characteristics that the density adjustable range is wide, the cleaning effect is good, and the shale gas development oil-base drilling fluid mud cake cleaning solution is beneficial to improving well cementing quality.

Description

Technical field: [0001] The invention relates to an oil-based drilling fluid mud cake cleaning fluid for shale gas development, and belongs to the technical field of chemical agents for petroleum drilling engineering. Background technique: [0002] In the process of shale gas development, oil-based drilling fluid technology and staged fracturing technology are commonly used; staged fracturing technology puts forward high requirements on cementing quality, while oil-based drilling fluid and cementing slurry are incompatible, and the cementing quality is not easy to control. [0003] In the cementing construction, if the cementing slurry is in direct contact with the oil-based drilling fluid, the cementing slurry will be polluted by the oil-based drilling fluid and produce viscous flocculation substances. After cementing slurry is polluted by drilling fluid, its fluidity decreases, and its viscosity and dynamic shear force increase, especially the increase of dynamic shear fo...

Claims

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Application Information

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IPC IPC(8): C09K8/52
CPCC09K8/52
Inventor 许明标王昌军由福昌王晓亮文守成刘卫红高阳吴素珍
Owner JINGZHOU JIAHUA TECH
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