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Flushing fluid for cementing of horizontal shale gas well

A technology for horizontal wells and shale gas, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as the deterioration of cement sheath interface bonding performance, and achieve the effect of wide adaptability

Active Publication Date: 2014-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that a layer of oil-based drilling fluid and oil film will adhere to the casing wall and the well wall when the oil-based drilling fluid is used in the drilling of shale gas horizontal wells, resulting in the deterioration of the bonding performance of the cement sheath interface

Method used

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  • Flushing fluid for cementing of horizontal shale gas well
  • Flushing fluid for cementing of horizontal shale gas well
  • Flushing fluid for cementing of horizontal shale gas well

Examples

Experimental program
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Effect test

example 1

[0024] Add 1.0g sodium carboxymethylcellulose to 200g domestic water and stir for 60 minutes, then add 10g fatty alcohol polyoxyethylene ether + 10g polyoxyethylene alkyl alcohol amine + 6g alkyl alcohol polyoxyethylene ether sodium phosphate +1g sulfonic acid.

example 2

[0026] Add 10g of sakado into 200g of deionized water and stir for 30 minutes, then add 2g of nonylphenol polyoxyethylene ether + 2g of polyoxyethylene alkyl alcohol amine + 14g of sodium alkyl alcohol polyoxyethylene ether phosphate + 3g of sulfonic acid .

example 3

[0028] Add 2.0g sodium carboxymethylcellulose to 200g deionized water and stir for 60 minutes, then add 4g fatty alcohol polyoxyethylene ether + 6g polyoxyethylene alkyl alcohol amine + 4g fatty acid polyoxyethylene ether potassium sulfate + 8g sulfuric acid acid.

[0029] The basic formula of white oil-based drilling fluid is: base oil + 2.8% primary emulsifier + 0.7% secondary emulsifier + 2% organic soil + 1% viscosifier + 25% CaCl2 solution + 2.5% CaO + 2% fluid loss reducer +3~5% plugging agent + water.

[0030] The basic formula of diesel-based drilling fluid is: base oil + 3.5% organic soil + 2.5% primary emulsifier + 0.9 secondary emulsifier + 1% viscosifier + 20% CaCl 2 Solution + 2% CaO + 3% fluid loss additive + 0.2% flow regulator + 2% plugging agent.

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Abstract

The invention provides a high-efficiency flushing fluid applicable to cementing of a horizontal shale gas well. The flushing fluid has certain shearing force and viscosity, exerts a dragging effect on oil slurry and an oil film under the action of hydraulic machinery and achieves the purposes of effective cleaning of the oil film and replacement of a viscous oil-based drilling fluid. The flushing fluid is mainly composed of a nonionic surfactant, an anionic surfactant, organic acid and a viscosity and shearing force improving agent, and comprises, by weight, 2 to 10 parts of the nonionic surfactant, 2 to 7 parts of the anionic surfactant, 2 to 4 parts of organic acid, 0.5 to 5.0 parts of the viscosity and shearing force improving agent and 72 to 100 parts of clear water. The flushing fluid provided by the invention has a high efficiency flushing effect on drilling fluids with high viscosity and shearing force and with a wide range of the oil-water ratio, e.g., from 60 / 40 (v / v) to 90 / 10(v / v).

Description

technical field [0001] The invention relates to oil field cementing technology, and belongs to the field of flushing and spacer fluids used for shale gas horizontal well cementing to clean oil-based drilling fluid. Background technique [0002] The main problem in the drilling process of shale gas horizontal wells is the wellbore instability. Wellbore instability will bring certain difficulties to operations such as drilling, geological logging, logging and cementing. As an excellent drilling fluid system, oil-based drilling fluid is often used in shale gas horizontal well drilling to solve the problem of shale stability, and has achieved good drilling results. However, as far as the cementing construction is concerned, the oil-based drilling fluid will stay at the interface and form oil slurry and oil film, which will seriously affect the interface bonding strength of the cement sheath and reduce the sealing quality of the cement sheath. Before operation, a flushing fluid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/40
CPCC09K8/52
Inventor 刘伟刘学鹏陶谦张明昌丁士东谭春勤刘建
Owner CHINA PETROLEUM & CHEM CORP
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