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Polymeric fluid loss additive of high-temperature, high-density and high-salinity water-based drilling fluid

A technology of water-based drilling fluid and fluid loss control agent, which is applied in the field of oil exploration and drilling, and can solve the problem that fluid loss control agent cannot provide fluid loss control

Active Publication Date: 2018-04-13
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Abstract
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  • Claims
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Problems solved by technology

However, in a high-concentration brine system, especially when the chloride ion concentration is above 150,000-180,000 mg / L, under conditions of high temperature (150°C or higher), high pressure, and high density (above 1.8), a single down filter Loss agents usually do not provide effective fluid loss control

Method used

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  • Polymeric fluid loss additive of high-temperature, high-density and high-salinity water-based drilling fluid
  • Polymeric fluid loss additive of high-temperature, high-density and high-salinity water-based drilling fluid

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Embodiment 1

[0037] This embodiment provides that the present invention provides a polymer fluid loss reducer for high-temperature, high-density, high-salinity water-based drilling fluids. Based on the total mass of the polymer fluid loss reducer as 100%, the polymer The raw material composition of the fluid loss agent includes: polymer A, polymer B and polymer C; wherein, polymer A is 35%; polymer B is 40%, and polymer C is 25%

[0038] Based on the total mass of polymer A as 100%, the raw material composition of polymer A includes: 50% acrylamide, 34.98% 2-acrylamido-2-methylpropanesulfonic acid, 15% N-vinyl Pyrrolidone and 0.02% redox initiator (sodium bromate and sodium bisulfite with a mass ratio of 1:1);

[0039] Based on the total mass of polymer B as 100%, the raw material composition of polymer B includes: 49.7% acrylamide, 35% 2-acrylamido-2-methylpropanesulfonic acid, 14.98% N-vinyl Pyrolidone, 0.3% cross-linking monomer and 0.02% redox initiator (sodium bromate and sodium bisu...

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Abstract

The invention provides a polymeric fluid loss additive of high-temperature, high-density and high-salinity water-based drilling fluid. The polymeric fluid loss additive is prepared from the raw materials: a polymer A, a polymer B and a polymer C, wherein the polymer A is prepared from acrylamide, 2-acrylamido-2-methyl propanesulfonic acid, N-vinylpyrrolidone and a redox initiator; the polymer B isprepared from acrylamide, 2-acrylamido-2-methyl propanesulfonic acid, N-vinylpyrrolidone, a cross-linking monomer and a redox initiator; and the polymer C is prepared from an aqueous phase, an oil phase, an initiator and a surfactant. The fluid loss additive provided by the invention is applicable to high-temperature, high-pressure, high-density and high-salinity drilling fluid.

Description

technical field [0001] The invention relates to a fluid loss reducer, in particular to a polymer fluid loss reducer for high-temperature, high-density, high-salinity water-based drilling fluid, and belongs to the technical field of petroleum exploration and drilling. Background technique [0002] Filtration control is an important performance of drilling fluid. Polymer fluid loss reducer is an important additive of water-based drilling fluid, which is used to improve the fluid loss performance of water-based drilling fluid and reduce the fluid loss of drilling fluid during drilling. [0003] The polymer fluid loss control agents suitable for high-temperature and high-pressure water-based drilling fluid systems currently on the market are usually water-soluble polymers containing acrylamide-2-acrylamido-2-methylpropanesulfonic acid or N-vinylpyrrolidone copolymer. However, in a high-concentration brine system, especially when the chloride ion concentration is above 150,000-...

Claims

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Application Information

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IPC IPC(8): C09K8/12C08F220/56C08F228/02C08F226/10
CPCC08F220/56C09K8/12C08F228/02C08F226/10
Inventor 吕萌刘付臣杨振周王伟黄平罗宇峰王君邓宇博汉·浩克夏
Owner BC P INC CHINA NAT PETROLEUM CORP
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