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Nano plugging agent for drilling fluid, preparation method thereof, and water-based drilling fluid containing the plugging agent

A nano plugging agent and drilling fluid technology, applied in the field of water-based drilling fluids, can solve the problems of unable to form effective support, unable to form continuous dispersion film and so on

Active Publication Date: 2021-09-10
ZHONGMAN GASOLINEEUM & NATURAL GAS GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional nano-blocking agents include polymers or rigid blocking agents, such as iron oxide, calcium carbonate, etc. Such blocking agents either cannot form effective supports, or cannot form continuous dispersed films, all of which have certain limitations

Method used

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  • Nano plugging agent for drilling fluid, preparation method thereof, and water-based drilling fluid containing the plugging agent
  • Nano plugging agent for drilling fluid, preparation method thereof, and water-based drilling fluid containing the plugging agent
  • Nano plugging agent for drilling fluid, preparation method thereof, and water-based drilling fluid containing the plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The present embodiment provides a drilling fluid nano-sealing agent, comprising: 15 parts of SiO by weight ratio 2 It is mixed with SiOx microcrystalline particles, 60 parts of sulfonated styrene and butadiene copolymer emulsion, 15 parts of modified bitumen powder, and 10 parts of amorphous soil. 15 parts of SiO 2Mix with SiOx microcrystalline particle mixture, 60 parts of sulfonated styrene and butadiene copolymer emulsion according to the method of S1, S2, S3, and mix with 5 parts of modified asphalt powder and 10 parts of amorphous soil to obtain Nano blocking agent.

Embodiment 2

[0044] The present embodiment provides a drilling fluid nano-sealing agent, comprising: 15 parts of SiO by weight ratio 2 It is mixed with SiOx microcrystalline particles, 70 parts of sulfonated styrene and butadiene copolymer emulsion, 10 parts of modified bitumen powder, and 5 parts of amorphous soil. 15 parts of SiO 2 After mixing with SiOx microcrystalline particle mixture, 70 parts of sulfonated styrene and butadiene copolymer emulsion according to the methods of S1, S2 and S3, and evenly mixing with 10 parts of modified asphalt powder and 5 parts of amorphous soil, the obtained Nano blocking agent.

Embodiment 3

[0046] The present embodiment provides a drilling fluid nano-sealing agent, comprising: 20 parts of SiO by weight ratio 2 It is mixed with SiOx microcrystalline particles, 65 parts of sulfonated styrene and butadiene copolymer emulsion, 10 parts of modified bitumen powder, and 5 parts of amorphous soil. 20 parts of SiO 2 After mixing with SiOx microcrystalline particle mixture, 65 parts of sulfonated styrene and butadiene copolymer emulsion according to the methods of S1, S2 and S3, and evenly mixing with 10 parts of modified asphalt powder and 5 parts of amorphous soil, the obtained Nano blocking agent.

[0047] The above-mentioned nano-blocking agent is used to prepare water-based drilling fluid. The water-based drilling fluid includes 20-30 parts of nano-sealing agent, 30 parts of bentonite, 4-6 parts of flow pattern regulator, and 10 parts of fluid loss reducer in parts by weight. -15 parts, 25-30 parts of blocking agent, 10-50 parts of weighting agent, and 0.1-0.4 parts...

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Abstract

The invention discloses a nano-blocking agent for drilling fluid, a preparation method thereof, and a water-based drilling fluid containing the plugging agent. The nano-blocking agent includes the following components in parts by weight: SiO 2 10-20 parts of SiOx microcrystalline particle mixture, 60-70 parts of sulfonated styrene and butadiene copolymer emulsion, 10-20 parts of modified asphalt powder, 5-10 parts of amorphous soil, the SiO 2 The mixture with SiOx microcrystalline particles is silicon dioxide with a particle size of 100-300 nanometers and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane mixed according to the weight ratio of 20:1 and stirred evenly After the preparation, the value range of x in SiOx is 0<x<2. SiO in the nano plugging agent of the present invention 2 The mixture with SiOx microcrystalline particles can be wrapped by sulfonated styrene and butadiene copolymer, and can form a better continuous dispersion plugging film in drilling fluid. The drilling fluid prepared by using the nano plugging agent of the present invention has good Excellent plugging performance, forming effective support for drilling wellbore.

Description

technical field [0001] The invention belongs to the technical field of water-based drilling fluid, and in particular relates to a drilling fluid nano-sealing agent, a preparation method thereof, and a water-based drilling fluid containing the sealing agent. Background technique [0002] At present, in the drilling of conventional and unconventional oil and gas (such as shale oil (gas)) directional wells and horizontal wells, when the drilling process encounters mud shale formations, there are many micro-fractures in brittle shale, and the pore size is very small. It is difficult for water-based drilling fluid to form an effective plug, so it often causes complex and accidents such as well wall instability, blockage and collapse, lost circulation, pressure difference adhesion sticking, damage to oil and gas production reservoirs, etc., resulting in Serious downhole and equipment safety accidents cause huge economic losses. Therefore, in order to solve these problems, oil-bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C09K8/14C08F8/36C08F212/08C08F236/10
CPCC08F8/36C08F212/08C09K8/03C09K8/14C09K2208/10C08F236/10
Inventor 顾新波
Owner ZHONGMAN GASOLINEEUM & NATURAL GAS GROUP