High-adaptability temperature-resistant plugging agent and application method thereof

An adaptable and leak-stopping agent technology, applied in the field of leak-stopping agents and high-adaptability temperature-resistant leak-stopping agents, can solve the problems of low plugging success rate, repeated leakage, high-temperature corruption of materials, etc., to improve the plugging success rate , The effect of single plugging formula and easy on-site operation

Inactive Publication Date: 2018-12-11
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, conventional bridge plugging materials are mostly filled with bridge particles such as walnut shells and fibers such as sawdust. However, studies have shown that at high temperatures, these materials are prone to high-temperature corruption and decomposition, which will lead to the failure of the plugging layer after a long time and repeated leakage; at the same time, Conventional plugging materials have poor compatibility with fractures, and it is difficult to effectively enter the leakage layer to form plugging, resulting in a low plugging success rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Based on the total mass of the highly adaptable temperature-resistant plugging agent as 100%, the raw material composition of the highly adaptable temperature-resistant plugging agent includes: diatomite 32.5%, flexible graphite 31.5%, mica powder 30.5%, reticulated Sponge 2.5%, Cellulose Fiber 3%.

[0023] The above-mentioned raw materials are mixed and stirred in proportion at room temperature to prepare a high-adaptability temperature-resistant plugging agent, which is added to clean water at a solid-to-liquid weight ratio of 0.15 and stirred evenly to form a plugging slurry.

[0024] The above-mentioned plugging slurry application method: according to the leakage situation, determine the running depth of the bare drill pipe to the top of the leaky layer, accurately replace the plugging slurry to the required position, and quickly move the drilling tool to a safe position, wait or shut down the well and hold the pressure for 2 hours~ 4h, complete the plugging process...

Embodiment 2

[0026] Based on the total mass of the high-adaptability temperature-resistant plugging agent as 100%, the raw material composition of the high-adaptability temperature-resistant plugging agent includes: Wyoming Ban soil 32%, flexible graphite 32%, mica powder 30.5%, reticulated Sponge 2.5%, chopped carbon fiber 3%.

[0027] The above raw materials are mixed and stirred in proportion at room temperature to prepare a highly adaptable anti-temperature plugging agent. The plugging agent is added to the water-based drilling fluid at a ratio of solid weight to base slurry volume of 0.1 g / ml and stirred evenly , which is the plugging slurry.

[0028] For the application method of the above lost circulation slurry, refer to Example 1.

[0029] In this embodiment, Wyoming soil and mica powder need to be added at the same time to achieve an effective plugging effect. Adding one of them alone will have a very unsatisfactory plugging effect. The reason may be due to the synergistic effe...

Embodiment 3

[0031] Based on the total mass of the highly adaptable temperature-resistant plugging agent as 100%, the raw material composition of the highly adaptable temperature-resistant plugging agent includes: attapulgite 32%, flexible graphite 32%, mica powder 30.5%, reticular 2.5% sponge, 3% polypropylene fiber.

[0032] The above raw materials are mixed and stirred in proportion at room temperature to prepare a highly adaptable temperature-resistant lost circulation plugging agent, which is added to the oil-based drilling fluid in an amount of 0.1 g / ml in the ratio of solid weight to base slurry volume and stirred evenly , which is the plugging slurry.

[0033] For the application method of the above lost circulation slurry, refer to Example 1.

[0034] The above examples further show that the leak stoppage agent of the present invention uses highly elastic particles as the skeleton material, which can effectively enter the inside of the leakage layer to form a bridge, and has stro...

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Abstract

The invention discloses a high-adaptability temperature-resistant plugging agent and application method thereof. The high-adaptability temperature-resistant plugging agent comprises the following components in percentage by weight: 31-34% of activated clay, 30-33% of flexible graphite, 30-31% of mica powder, 2-3% elastomer sponge and 2.5-3.5% of fibers. The invention further provides a preparationmethod of the high-adaptability temperature-resistant plugging agent and application thereof in preparation of plugging working fluid. Based on the base solution per 100milliliters, the addition amount of the high-adaptability temperature-resistant plugging agent is 8-15g. The method comprises the following steps: determining the setting depth of a light drill stem to be the top of a leakage zoneaccording to the leakage condition, accurately replacing the plugging slurry to the required position, rapidly lifting the drilling tool to a safety position, waiting or shutting in and building thepressure for 2-4 hours, and completing the plugging process. The plugging agent is excellent in temperature resistance and high in crack matching degree and can effectively enter the leakage zone to form plugging, the plugging success rate is improved, the plugging formula is single aiming at the leakage zone of different crack width, and convenience is brought to field operations.

Description

technical field [0001] The invention relates to a plugging agent used in oil exploration and drilling, in particular to a highly adaptable temperature-resistant plugging agent, which belongs to the technical field of drilling fluids. Background technique [0002] At present, conventional bridge plugging materials are mostly filled with bridge particles such as walnut shells and fibers such as sawdust. However, studies have shown that at high temperatures, these materials are prone to high-temperature corruption and decomposition, which will lead to the failure of the plugging layer after a long time and repeated leakage; at the same time, Conventional plugging materials have poor compatibility with fractures, and it is difficult to effectively enter the leakage layer to form plugging, resulting in a low plugging success rate. Contents of the invention [0003] In order to solve the above technical problems, the object of the present invention is to provide a highly adaptab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46
CPCC09K8/426C09K8/46C09K2208/08
Inventor 卜凡康李公让刘振东周守菊张妍张守文张斌明玉广
Owner 中石化石油工程技术服务有限公司
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