Preparation method of shale micro/nano particle plugging agent for water-base drilling fluids

A technology of micro-nano particles and water-based drilling fluid, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems that cannot meet the special plugging requirements of shale gas formations, configuration cost and environmental protection, and pore throat size Low permeability and other issues, to achieve good monodispersity and water resistance, clean surface, retard pressure transmission and filtrate intrusion effect

Active Publication Date: 2015-07-08
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the extremely small pore throat size and extremely low permeability of shale, conventional drilling fluid plugging agents such as bitumen, emulsified paraffin, and polymeric alcohol have a relatively large particle size and cannot enter the shale to achieve a good plugging effect.
[0004] At the same time, oil-based drilling fluid is currently the first choice for shale gas horizontal wel

Method used

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  • Preparation method of shale micro/nano particle plugging agent for water-base drilling fluids
  • Preparation method of shale micro/nano particle plugging agent for water-base drilling fluids
  • Preparation method of shale micro/nano particle plugging agent for water-base drilling fluids

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Example Embodiment

[0029] Example 1

[0030] A preparation method of shale micro-nano particle plugging agent for drilling fluid: into a reactor equipped with a stirrer, a thermometer and a heating device, add 200 mL of distilled water, add 100 mL of acetone and 12.3 g of methyl methacrylate while stirring 9.6g of styrene, 1500r / min high-speed stirring to form a stable dispersion system, heated in a water bath to a temperature of 70°C, added with 0.08g of potassium persulfate, reacted for 2.5h, and naturally cooled to obtain shale micro-nanoparticle plugging agent for drilling fluid .

Example Embodiment

[0031] Example 2

[0032] A preparation method of shale micro-nano particle plugging agent for drilling fluid: into a reaction kettle equipped with a stirrer, a thermometer and a heating device, add 300 mL of distilled water, add 150 mL of acetone, 16.7 g of n-butyl acrylate, 11.2g of vinyl acetate, 1000r / min high-speed stirring to form a stable dispersion system, heated in a water bath to a temperature of 85°C, 0.12g of azobisisoheptanenitrile was added, reacted for 3.5h, and naturally cooled to obtain shale micro-nano particles for drilling fluid Blocking agent.

Example Embodiment

[0033] Example 3

[0034] A preparation method of shale micro-nano particle plugging agent for drilling fluid: into a reactor equipped with a stirrer, a thermometer and a heating device, add 250 mL of distilled water, and add 130 mL of isopropanol and ethyl methacrylate while stirring. 12.3g, 9.6g of styrene, 2000r / min high-speed stirring to form a stable dispersion system, heated in a water bath to a temperature of 90°C, added 0.10g of azobisisobutyronitrile, reacted for 2.0h, and naturally cooled to obtain shale microparticles for drilling fluid. Nanoparticle blocking agent.

[0035] The product performance and application effect of the embodiment will be described below.

[0036] 1. Particle size distribution characteristics of shale micro-nano particle plugging agents

[0037] Using a laser particle size distribution tester, the particle size distribution characteristics of the micro-nano particle plugging agents of the above different embodiments were tested.

[0038] ...

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Abstract

The invention relates to a preparation method of a shale micro/nano particle plugging agent for water-base drilling fluids. The method comprises the following step: adding an initiator to initiate polymerization reaction on acrylate or methacrylate monomer and vinyl monomer in a water medium in the presence of a cosolvent. The particle size distribution of the micro/nano particle plugging agent is D10<=100nm, D50<=165nm and D90<=260nm. The water-base shale micro/nano particle plugging agent provided by the invention is micro/nano deformable polymer latex particles, can form a continuous compact plugging layer inside the shale under the actions of adsorption, bridging and deformable filling, performs the function of preventing and relieving pressure transfer and filtrate invasion, and enhances the stability of the shale well wall.

Description

technical field [0001] The invention relates to a preparation method of a shale micro-nano particle plugging agent for water-based drilling fluid, and belongs to the technical field of oilfield chemical drilling fluid treatment agents. technical background [0002] my country's shale gas resource prediction technology recoverable reserves reach 10.3×10 12 ~47×10 12 m 3 , has good prospects for exploration and development. Once successful large-scale exploration and development can effectively alleviate the contradiction between oil and gas supply and demand in my country, shale gas exploration and development has become a major national strategy in the "Twelfth Five-Year Plan". At this stage, horizontal drilling technology is one of the core technologies for shale gas development and is widely used in shale gas development drilling. In order to increase production by hydraulic fracturing in the later stage, horizontal well sections are mostly distributed in formations wit...

Claims

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Application Information

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IPC IPC(8): C09K8/42C09K8/035
CPCC09K8/035C09K8/426C09K2208/10
Inventor 刘均一邱正松林永学黄维安钟汉毅张凤英暴丹
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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