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Oil-based drilling fluid plugging agent

A technology of oil-based drilling fluid and loss-stopping agent, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of economic loss, material waste, and high cost of oil-based drilling fluid preparation

Inactive Publication Date: 2016-04-13
YANGTZE UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In recent years, shale gas development has developed rapidly in China. However, in view of the stability of shale formations, most shale gas drilling currently uses oil-based drilling fluid systems. Therefore, oil-based drilling fluid systems are used in shale gas drilling. It can be popularized and applied in a large area. The main feature of shale formations is the widespread development of micro-fractures and the existence of induced fracturing to cause leakage. However, during the use of oil-based drilling fluid systems, oil-based drilling fluid leakage often occurs
Due to the high cost of oil-based drilling fluid preparation, the loss of oil-based drilling fluid will inevitably cause a lot of material waste, delay the drilling cycle, and cause huge economic losses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1), choose 55 parts of quartz sand powder with a particle size not greater than 0.9mm, 20 parts of a mixture of cottonseed hull powder and sawdust powder with a particle size not greater than 0.3mm, 10 parts of rubber powder with a particle size not greater than 0.3mm, four 10 parts of cycloaromatic hydrocarbons, 4.5 parts of acrylic acid-acrylamide-acrylonitrile copolymer, 0.5 parts of Tween 80, stirred and mixed evenly according to the weight ratio;

[0040] (2) Put the mixture obtained in step (1) into a kneader, heat it to 120°C, react for 4 to 12 hours, cool it naturally, and crush it to a particle size or powder with a particle size of less than 0.9mm, that is, to obtain The oil-based drilling fluid plugging agent is code-named XOD-1.

Embodiment 2

[0042] (1), choose 45 parts of quartz sand powder with a particle size not greater than 0.9mm, 18 parts of a mixture of cottonseed hull powder and sawdust powder with a particle size not greater than 0.3mm, and 20 parts of rubber powder with a particle size not greater than 0.3mm. 20 parts of cycloaromatic hydrocarbons, 8 parts of acrylic acid-acrylamide-acrylonitrile copolymer, 1.5 parts of Tween 80, stirred and mixed evenly according to the weight ratio;

[0043] (2) Put the mixture obtained in step (1) in a kneader at 130°C, stir and react for 4 to 12 hours, then cool naturally, and pulverize into granular or powder with a particle size of less than 0.9mm, that is, to obtain oil-based The drilling fluid plugging agent is code-named XOD-2.

Embodiment 3

[0045] (1) Select 50 parts of calcite mineral powder with a particle size not greater than 0.9mm, 25 parts of a mixture of cottonseed husk powder and rice husk powder with a particle size not greater than 0.3mm, 15 parts of rubber powder with a particle size not greater than 0.3mm, Sihuan 15 parts of aromatic hydrocarbons, 5.5 parts of acrylic acid-acrylamide-acrylonitrile copolymer, 2 parts of OP-15, stirred and mixed evenly according to the weight ratio;

[0046] (2) Put the mixture obtained in step (1) into a kneader, heat it to 130°C, stir and react for 4 to 12 hours, then cool it naturally, and crush it into granular or powder with a particle size of less than 0.9mm to obtain The oil-based drilling fluid plugging agent is code-named XOD-3.

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Abstract

An oil-based drilling fluid plugging agent is prepared from, by weight, 45.0-60.0 parts of a rigid plugging material, 10.0-25.0 parts of a composite fiber material, 10.0-20.0 parts of an oil-absorbing expansion material, 10.0-20.0 parts of an oil-soluble plugging material, 2.5-8.0 parts of a water-absorbing expansion material, and 0.5-2.5 parts of a surfactant. The oil-based drilling fluid plugging agent has good compatibility with an oil-based drilling fluid, and can adapt to stratum with the temperature of 60-150DEG C; and the dosage is 1-5%, the plugging agent has a good plugging effect when used to plug 10-20 mesh quartz sand beds or 0.5mm micro-crack stratums, and the pressure bearing capability of the plugging agent is greater than 6.0MPa.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling engineering, in particular to an oil-based drilling fluid plugging agent used in shale gas. Background technique [0002] In recent years, shale gas development has developed rapidly in China. However, in view of the stability of shale formations, most shale gas drilling currently uses oil-based drilling fluid systems. Therefore, oil-based drilling fluid systems are used in shale gas drilling. It can be popularized and applied in a large area. The main feature of shale formations is the widespread development of micro-fractures and induced fracturing to cause leakage. However, during the use of oil-based drilling fluid systems, oil-based drilling fluid leakage often occurs. Due to the high cost of oil-based drilling fluid preparation, the loss of oil-based drilling fluid will inevitably cause a lot of material waste, delay the drilling cycle, and cause huge economic losses. Therefore...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/32
CPCC09K8/03C09K8/32C09K2208/04
Inventor 王正良张学成王双成李成军佘跃惠朱绍洪
Owner YANGTZE UNIVERSITY
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