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A drilling fluid cleaning slurry for wellbore purification and its preparation and use method

A drilling fluid and wellbore technology, which is applied in the field of drilling fluid formulation and processing technology, can solve the problems of undisclosed drilling fluid cleaning slurry and general cuttings effect, so as to reduce the probability of cuttings bed formation, avoid repeated cutting, and prevent drilling tools The effect of mud bag

Active Publication Date: 2021-08-10
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

At present, when solving the problem of wellbore purification during drilling, those skilled in the art generally adjust the rheological properties of the drilling fluid to improve the efficiency of wellbore purification. In particular, relevant theoretical research and field practice have been carried out on the problem of cuttings carrying in the inclined well section and the horizontal section. Good results have been achieved, but the above problems cannot be completely solved. At the same time, relevant explorations have been carried out in the field of drilling tools, and some wellbore cleaning tools have been invented. Generally, and the prior art does not disclose drilling fluid sweeping slurry, so it is very promising to develop a drilling fluid cleaning slurry for wellbore purification and its preparation and use method

Method used

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  • A drilling fluid cleaning slurry for wellbore purification and its preparation and use method
  • A drilling fluid cleaning slurry for wellbore purification and its preparation and use method

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specific Embodiment approach

[0022] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for the understanding and reading of those familiar with this technology, and are not used to limit the conditions for the implementation of the present invention , any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope covered by the technical content disclosed in the present invention without affecting the effect and purpose of the present invention. .

[0023] At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without...

Embodiment 1

[0034] The invention discloses a drilling fluid cleaning slurry for wellbore purification. The cleaning slurry includes a pre-sweeping slurry and a post-sweeping slurry, wherein the pre-sweeping slurry is composed of the following components in mass percentage: 0.1% to 1.0% 0.2%-1.5% of plugging agent, 1.0%-15.0% of coarse particle plugging agent, 0.1%-1.5% of drilling fluid lubricant, clean water to make up the balance, among which the cleaning slurry It consists of the following components by mass percentage: 0.1% to 1.0% of polymer viscosity raising agent and / or 1.0% to 8.0% of weighting agent, 2.0% to 15.0% of coarse particle plugging agent, and drilling fluid to make up the balance.

Embodiment 2

[0036] The invention discloses a drilling fluid cleaning slurry for wellbore purification. The cleaning slurry includes a pre-sweeping slurry and a post-sweeping slurry, wherein the pre-sweeping slurry is composed of the following components in mass percentage: 0.1% to 1.0% 0.2%-1.5% of plugging agent, 1.0%-15.0% of coarse particle plugging agent, 0.1%-1.5% of drilling fluid lubricant, clean water to make up the balance, among which the cleaning slurry It consists of the following components by mass percentage: 0.1% to 1.0% of polymer viscosity raising agent and / or 1.0% to 8.0% of weighting agent, 2.0% to 15.0% of coarse particle plugging agent, and drilling fluid to make up the balance.

[0037] Preferably, the pre-cleaning slurry is composed of the following components by mass percentage: 0.2% to 0.5% polymer viscosity raising agent, 0.5% to 1.0% plugging agent, 5.0% to 10.0% coarse particle plugging agent, 0.5% to 1.0% drilling fluid lubricant, and clean water to make up th...

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Abstract

The invention discloses a drilling fluid cleaning slurry for wellbore purification and its preparation and use method. The cleaning slurry includes a pre-sweeping slurry and a post-sweeping slurry, wherein the pre-sweeping slurry is composed of the following components by mass percentage : 0.1%~1.0% polymer viscosity enhancer, 0.2%~1.5% plugging agent, 1.0%~15.0% coarse particle plugging agent, 0.1%~1.5% drilling fluid lubricant, clean water to make up the balance , wherein the post-cleaning slurry is composed of the following components by mass percentage: 0.1% to 1.0% of polymer viscosity raising agent and / or 1.0% to 8.0% of weighting agent, 2.0% to 15.0% of coarse particle plugging agent, Drilling fluid makes up the balance.

Description

technical field [0001] The invention belongs to the technical field of drilling fluid formula and treatment technology, and in particular relates to a drilling fluid cleaning slurry for wellbore purification and a preparation and use method thereof. Background technique [0002] The Ecuador Basin is located in the Amazon tropical rainforest in the east of the country. It has rich oil reservoirs, complex geological structure, and high environmental protection requirements, which have brought many problems to drilling operations. This block is mainly developed by directional wells and horizontal wells. Mudstone, argillaceous sandstone, mixed with gravel. The characteristics of the upper formation are relatively new, the mudstone is soft, and the slurry is serious. In particular, the mudstone cuttings may form sticky mud, or cling to the well wall, or thicken the virtual mud cake, or cause mud balling of the drilling tool, resulting in difficulty in tripping , the mud blocks b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/528C09K8/035E21B21/00
CPCC09K8/035C09K8/528E21B21/00
Inventor 赵向阳李宝军张小平崔贵涛蒋振伟王国庆陈龙周雄兵曹辉胡恒寄晓宁雷江黎金明王京光董宏伟陈磊尹敬军苏欢王勇强丁磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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