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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 well drilling, but its application range is greatly limited due to its configuration cost and environmental protection issues
The high-performance water-based drilling fluid system emerging in recent years is expected to become an ideal substitute for oil-based drilling fluid, while the plugging agent for conventional water-based drilling fluid cannot meet the special plugging needs of shale gas formations

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

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Effect test

Embodiment 1

[0030] A preparation method of shale micro-nano particle plugging agent for drilling fluid: add 200mL of distilled water to a reaction kettle equipped with a stirrer, a thermometer and a heating device, and add 100mL of acetone and 12.3g 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 0.08g of potassium persulfate, reacted for 2.5h, and naturally cooled to obtain a shale micro-nano particle plugging agent for drilling fluid .

Embodiment 2

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

Embodiment 3

[0034] A preparation method of shale micro-nano particle plugging agent for drilling fluid: add 250mL of distilled water to a reaction kettle equipped with a stirrer, a thermometer and a heating device, and add 130mL of isopropanol and ethyl methacrylate while stirring 12.3g, styrene 9.6g, 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 microbeads for drilling fluids. Nanoparticle blocking agent.

[0035] The product performance and application effects of the embodiments are described below.

[0036] 1. Particle size distribution characteristics of shale micro-nanoparticle plugging agent

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

[0038] It can be seen from...

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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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