Core-shell type oil-based drilling fluid plugging and bridging particle and preparation method thereof

An oil-based drilling fluid and particle technology, applied in chemical instruments and methods, drilling compositions, products, etc., can solve problems such as the limitation of plugging performance, the lack of dispersion performance of calcium carbonate particles, and the lack of pressure bearing capacity

Active Publication Date: 2018-05-04
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dispersion performance and pressure bearing capacity of calcium carbonate particles in oil-based mud are somewhat lacking, which limits the plugging performance

Method used

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  • Core-shell type oil-based drilling fluid plugging and bridging particle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A core-shell type oil-based drilling fluid plugging and bridging particles, prepared by the following method: first, 30 parts by weight of butyl acrylate, 30 parts by weight of styrene, 25 parts by weight of stearyl methacrylate, 0.3 parts by weight Parts of oligomeric siloxane with a degree of polymerization of 2 to 4 and 0.1 part by weight of azobisisobutyronitrile were added to the reaction kettle in sequence, and under nitrogen protection, the temperature was raised to 50°C, and the reaction was carried out at a constant temperature for 24 hours under stirring to obtain lipophilic high polymer; then the prepared lipophilic high polymer is poured into the tray, the calcium carbonate particles are placed in the tray and the tray is slightly shaken, so that the lipophilic high polymer is evenly and completely coated on the calcium carbonate particles Surface; Finally, put the calcium carbonate particles coated with lipophilic polymer layer in another tray, and bake in a...

Embodiment 2

[0020] A core-shell type oil-based drilling fluid plugging and bridging particles, prepared by the following method: first, 40 parts by weight of butyl acrylate, 40 parts by weight of styrene, 25 parts by weight of stearyl methacrylate, 0.2 parts by weight Parts of oligomeric siloxane with a degree of polymerization of 2 to 4 and 0.2 parts by weight of azobisisobutyronitrile were added to the reaction kettle in sequence. Under nitrogen protection, the temperature was raised to 50°C, and the temperature was reacted for 24 hours under stirring to obtain lipophilic high polymer; then the prepared lipophilic high polymer is poured into the tray, the calcium carbonate particles are placed in the tray and the tray is slightly shaken, so that the lipophilic high polymer is evenly and completely coated on the calcium carbonate particles Surface; Finally, put the calcium carbonate particles coated with lipophilic polymer layer in another tray, and bake in an oven at 105°C for 2 hours, t...

Embodiment 3

[0022] A core-shell type oil-based drilling fluid plugging and bridging particles, prepared by the following method: first, 35 parts by weight of butyl acrylate, 35 parts by weight of styrene, 20 parts by weight of stearyl methacrylate, 0.2 parts by weight Parts of oligomeric siloxane with a degree of polymerization of 2 to 4 and 0.15 parts by weight of azobisisobutyronitrile were added to the reaction kettle in sequence, and the temperature was raised to 52°C under nitrogen protection, and the reaction was carried out at a constant temperature for 24 hours under stirring to obtain lipophilic high polymer; then the prepared lipophilic high polymer is poured into the tray, the calcium carbonate particles are placed in the tray and the tray is slightly shaken, so that the lipophilic high polymer is evenly and completely coated on the calcium carbonate particles Surface; Finally, put the calcium carbonate particles coated with lipophilic polymer layer in another tray, and bake in ...

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Abstract

The invention discloses a core-shell type oil-based drilling fluid plugging and bridging particle and a preparation method thereof. The bridging particle adopts a core-shell structure particle formedby coating an oleophilic polymer layer on the surface of calcium carbonate particles, wherein the oleophilic polymer is a macromolecular copolymer of butyl acrylate, styrene and octadecyl methacrylate. According to the core-shell type oil-based drilling fluid plugging and bridging particle, an oleophilic polymer film layer is attached onto the surface of the original plugging and bridging particle, so that embrittlement of the original plugging and bridging particle is reduced, the pressure-bearing capacity of the original plugging and bridging particle in drilling fluid plugging slurry reaches 5MPa or higher, the density of the original plugging and bridging particle is reduced, the suspension property of the particle in the oil-based drilling fluid is increased, and by enhancing lipophilic property of the original plugging and bridging particle, the aims of improving the suspension dispersity of the plugging and bridging particle in the oil-based drilling fluid and improving the pressure-bearing ability of the whole oil-based drilling fluid plugging formula are achieved. In addition, the bridging particle is simple and feasible in preparation method and has excellent market popularization value.

Description

technical field [0001] The invention relates to the technical field of oil drilling fluid plugging materials, in particular to a core-shell oil-based drilling fluid plugging and bridging particle and a preparation method thereof. Background technique [0002] Deep wells, shale gas wells, and coalbed methane wells are often drilled with oil-based drilling fluids. During the drilling process, a large amount of oil-based drilling fluids often leak out, causing considerable losses. [0003] Most of the existing oil-based drilling fluid plugging materials are compounded with various plugging agents, including bridging materials, filling materials, fiber materials, etc. The plugging performance plays a decisive role, and the suspension dispersion and pressure bearing capacity of bridging materials are the key factors affecting the overall plugging performance. The bridging material currently used in oil-based drilling fluid plugging materials is usually calcium carbonate particle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/42
CPCC09K8/03C09K8/426C09K2208/18Y02P20/141
Inventor 赵鹏刘艳郝惠军刘永峰张洪伟张雅静田慧喻化民程智刘学玲付跃华曹靖瑜张宇刘德庆
Owner BC P INC CHINA NAT PETROLEUM CORP
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