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A low-injury water-based drilling fluid suitable for Ecuadorian rainforest and its preparation method

A water-based drilling fluid, rainforest technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as low recovery rate and protection of reservoirs, achieve wide sources, good reservoir protection characteristics, lubrication good effect

Active Publication Date: 2021-11-19
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

Domestic similar patents mostly emphasize the inhibition of the drilling fluid system, which is technically different from the horizontal wells in the tropical rainforest of Ecuador. The reservoir is not protected to the maximum extent under the premise of open hole completion, and the recovery rate is low.

Method used

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  • A low-injury water-based drilling fluid suitable for Ecuadorian rainforest and its preparation method

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specific Embodiment approach

[0030]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. .

[0031] 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

[0041] The invention discloses a low-damage water-based drilling fluid suitable for the Ecuadorian rainforest. Conditioner, soluble salt weighting agent and water, wherein the weight percentage of each component is: thickener 0.2~1.0%, fluid loss reducer 0.4~1.0%, preservative 0.05~0.2%, acid soluble Temporary plugging agent 2.0~4.0%, temperature control lubricant 0.2~0.8%, pH regulator 0.05~0.2%, soluble salt weighting agent 1.0~3.0%, water to make up the balance.

Embodiment 2

[0043] The invention discloses a low-damage water-based drilling fluid suitable for the Ecuadorian rainforest. Conditioner, soluble salt weighting agent and water, wherein the weight percentage of each component is: thickener 0.2~1.0%, fluid loss reducer 0.4~1.0%, preservative 0.05~0.2%, acid soluble Temporary plugging agent 2.0~4.0%, temperature control lubricant 0.2~0.8%, pH regulator 0.05~0.2%, soluble salt weighting agent 1.0~3.0%, water to make up the balance.

[0044] Preferably, the weight percentage of each component is: 0.4-0.7% of tackifier, 0.6-0.9% of fluid loss reducer, 0.05-0.1% of preservative, 2.9-3.6% of acid-soluble temporary plugging agent, Temperature control lubricant 0.3~0.5%, pH regulator 0.1~0.15%, soluble salt weighting agent 1.9~2.4%, water to make up the balance.

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Abstract

The invention discloses a low-damage water-based drilling fluid suitable for the Ecuadorian rainforest and a preparation method thereof. agent, pH adjuster, soluble salt weighting agent and water, wherein the weight percentage of each component is: thickener 0.2~1.0%, fluid loss reducer 0.4~1.0%, preservative 0.05~0.2%, Acid soluble temporary plugging agent 2.0~4.0%, temperature control lubricant 0.2~0.8%, pH regulator 0.05~0.2%, soluble salt weighting agent 1.0~3.0%, water to make up the balance. The preparation and maintenance of the water-based drilling fluid system of the present invention are simple, no additional auxiliary equipment is needed, it has the characteristics of low viscosity and high shear, and at the same time it has low water loss, good plugging effect, can effectively protect the reservoir, is easy to store, and can reuse.

Description

technical field [0001] The invention belongs to the technical field of oilfield drilling, and in particular relates to a low-damage water-based drilling fluid suitable for the Ecuadorian rainforest and a preparation method thereof, which is mainly used for horizontal section drilling operations of horizontal wells. Background technique [0002] Ecuador is a country located in the northwest of South America. It is adjacent to Colombia in the north, Peru in the south, and the Pacific Ocean in the west. Ecuador's crude oil is mainly heavy crude oil, with an API value of 12-15. The main production area is in the eastern tropical rainforest area, and there are several oil fields such as Tarapoa, Auca, and Shushufindi. Ecuador's oil development began in the 1970s, led by Western multinational oil companies, and adopted a relatively extensive development method, resulting in serious environmental pollution, which triggered international lawsuits that lasted for many years. After e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12C09K8/10C09K8/08
CPCC09K8/08C09K8/10C09K8/12C09K2208/34
Inventor 蒋振伟李宝军崔贵涛赵向阳曹辉周雄兵胡恒王国庆雷江陈龙寄晓宁郑玉辉郝超凡帆王勇强苏欢陈磊杨建荣蔺文洁梁海军丁磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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