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Anti-collapse plugging agent for drilling fluids, and preparation method thereof, and drilling fluid

A technology of drilling fluid and plugging agent, which is applied in the field of oil field drilling fluid, can solve problems such as unfavorable pores and micro-fractures, and achieve good application prospects

Active Publication Date: 2019-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the surface of these nanoparticles is negatively charged, which will produce electrostatic repulsion with the same negatively charged mud shale, which is also not conducive to their entry into the nano-micron pores and micro-cracks of mud shale.

Method used

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  • Anti-collapse plugging agent for drilling fluids, and preparation method thereof, and drilling fluid
  • Anti-collapse plugging agent for drilling fluids, and preparation method thereof, and drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0070] Place in a 1000mL beaker and add 200mL of sodium tripolyphosphate solution with a weight concentration of 0.75g / L and 500mL of a chitosan solution (dissolved in 1% acetic acid) with a weight concentration of 2g / L, and use 0.1mol / L of hydrogen Sodium oxide solution adjusted the pH of the reaction system to 7, and then stirred at room temperature (1000 rpm) for 1 h. The obtained product aqueous solution was ultrasonically dispersed for 1 min, and then the solid phase was separated by centrifugation, washed several times with deionized water and ethanol, and then vacuum-dried at 60°C for 16 h to finally obtain powdered chitosan nanogel A1. The Zeta potential of the product chitosan nanogel measured by a laser particle size analyzer was 28.1 mV, and the average particle size was 355 nm. The product chitosan nanogel was observed as spherical particles by transmission electron microscope (TEM).

Embodiment 2

[0072] Place in a 1000mL beaker and add 200mL of sodium tripolyphosphate solution with a weight concentration of 1.25g / L and 500mL of chitosan solution (dissolved in 1% acetic acid) with a weight concentration of 2g / L, and use 0.1mol / L of hydrogen Sodium oxide solution adjusted the pH of the reaction system to 7, and then stirred at room temperature (1000 rpm) for 1 h. The obtained product aqueous solution was ultrasonically dispersed for 1 min, and then the solid phase was separated by centrifugation, washed several times with deionized water and ethanol, and then vacuum-dried at 60° C. for 16 h to finally obtain powdered chitosan nanogel A2. The Zeta potential of the product chitosan nanogel measured by laser particle size analyzer is 20.2mV, and the average particle diameter is 268nm. The product chitosan nanogel was observed as spherical particles by transmission electron microscope (TEM).

Embodiment 3

[0074] Place in a 1000mL beaker and add 200mL of sodium tripolyphosphate solution with a weight concentration of 2.0g / L and 500mL of a chitosan solution (dissolved in 1% acetic acid) with a weight concentration of 2g / L, and use 0.1mol / L of hydrogen Sodium oxide solution adjusted the pH of the reaction system to 7, and then stirred at room temperature (1000 rpm) for 1 h. The obtained product aqueous solution was ultrasonically dispersed for 1 min, and then the solid phase was separated by centrifugation, washed several times with deionized water and ethanol, and then vacuum-dried at 60° C. for 16 h to finally obtain powdered chitosan nanogel A3. The Zeta potential of the chitosan nanogel measured by a laser particle size analyzer was 9.1 mV, and the average particle size was 128 nm. The product chitosan nanogel was observed as spherical particles by transmission electron microscope (TEM).

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Abstract

The invention relates to an anti-collapse plugging agent for drilling fluids, and a preparation method thereof, and a drilling fluid, and belongs to the technical field of oil field drilling fluids. According to the present invention, the anti-collapse plugging agent is selected from a chitosan nano-gel, wherein the chitosan nano-gel has an average particle size (D50) of 50-500 nm, has a zeta potential of 0 to +50 mV, and is prepared by a method selected from a chemical cross-linking method, an ion gel method, a precipitation method and an emulsion drop aggregation method; the use amount of the anti-collapse plugging agent for drilling fluids is 0.1-5 parts by weight, preferably 1-2 parts by weight, by using the water in a drilling fluid as 100 parts by weight; the chitosan nano-gel micro-particles can be deformed, and are positively charged on the surface, such that the chitosan nano-gel micro-particles are easily squeezed into the micro-nano pores and micro-cracks of mud shale underthe action of downhole pressure difference so as to provide the effective anti-collapse plugging effect; and the drilling fluid can be used in various oil-gas wells such as straight wells, directionalwells, large displacement wells, horizontal wells and the like.

Description

technical field [0001] The invention relates to the technical field of oil field drilling fluid, and more particularly, relates to an anti-slump plugging agent for drilling fluid, a preparation method thereof and drilling fluid. Background technique [0002] The problem of maintaining wellbore stability is a worldwide problem in the drilling industry. This problem exists in many oil fields in the world and has not been well resolved. As my country's oil and gas exploration and development targets are further oriented toward deep oil and gas resources buried in very complex geological conditions and unconventional resources such as coalbed methane and shale gas, wellbore stability problems are often encountered during the drilling process, which will lead to complex deep wells and shale gas. The slow drilling speed of gas horizontal wells, many complex accidents, long drilling cycle and high cost have seriously affected the exploration and development process of important repl...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/08C08J3/075C08L5/08
CPCC08J3/075C08J2305/08C09K8/035C09K8/08C09K2208/10C09K2208/12
Inventor 宣扬钱晓琳杨小华王琳陈铖林永学
Owner CHINA PETROLEUM & CHEM CORP
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