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Low-damage water-based drilling fluid suitable for Ecuadorian rainforest and preparation method

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

Active Publication Date: 2019-11-12
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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  • Low-damage water-based drilling fluid suitable for Ecuadorian rainforest and preparation method

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specific Embodiment approach

[0030] It should be noted that the structure, ratio, size, etc. shown in this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the implementation of the present invention. Any structural modification, proportional relationship change or size adjustment should still fall within the scope of the technical content disclosed in the present invention without affecting the effects and objectives that the present invention can produce. .

[0031] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the text. The scope of implementation of the invention, the change or adjustment of its relative relationship, without substantial changes to the technical content, shall also be regarded as the scope of implementation of the invention.

[0...

Embodiment 1

[0041] The invention discloses a low-damage water-based drilling fluid suitable for Ecuador’s rainforest. The water-based drilling fluid consists of a thickener, a fluid loss agent, a preservative, an acid-soluble temporary plugging agent, a temperature control lubricant, and a pH Conditioner, soluble salt weighting agent and water composition, the weight percentage of each component is: 0.2~1.0% of viscosity increasing agent, 0.4~1.0% of fluid loss agent, 0.05~0.2% of preservative, 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 makes up the balance.

Embodiment 2

[0043] The invention discloses a low-damage water-based drilling fluid suitable for Ecuador’s rainforest. The water-based drilling fluid consists of a thickener, a fluid loss agent, a preservative, an acid-soluble temporary plugging agent, a temperature control lubricant, and a pH Conditioner, soluble salt weighting agent and water composition, the weight percentage of each component is: 0.2~1.0% of viscosity increasing agent, 0.4~1.0% of fluid loss agent, 0.05~0.2% of preservative, 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 makes up the balance.

[0044] Preferably, the weight percentage of each component is: 0.4~0.7% of viscosity increasing agent, 0.6~0.9% of fluid loss agent, 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 makes...

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Abstract

The invention discloses a low-damage water-based drilling fluid suitable for Ecuadorian rainforest and a preparation method. The water-based drilling fluid is prepared from a tackifier, a fluid loss agent, a preservative, an acid-soluble temporary plugging agent, a temperature control lubricant, a pH regulator, a soluble salt weighting agent and water, wherein the weight percentages of componentsare as follows: 0.2 to 1.0 percent of tackifier, 0.4 to 1.0 percent of fluid loss agent, 0.05 to 0.2 percent of preservative, 2.0 to 4.0 percent of acid-soluble temporary plugging agent, 0.2 to 0.8 percent of temperature control lubricant, 0.05 to 0.2 percent of pH regulator, 1.0 to 3.0 percent of soluble salt weighting agent and the balance of water. The water-based drilling fluid system disclosed by the invention is simple to prepare and maintain, does not need additional auxiliary equipment, has the characteristics of low viscosity and high shear, has the advantages of lower water loss andfavorable plugging effect, can effectively protect a reservoir, is easy to store, and can be repeatedly utilized.

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, and is mainly used for horizontal section drilling operations of horizontal wells. Background technique [0002] Ecuador is a country located in the northwestern part of South America. It borders Colombia to the north, Peru to the south, and the Pacific Ocean to the west. Ecuador is a member of OPEC and produces over 500,000 barrels of crude oil per day. Ecuador's crude oil is dominated by heavy crude oil, with an API value generally ranging from 12 to 15. The main production area is in the eastern tropical rain forest area, with several oil fields such as Tarapaa, Auca and Shushufindi. Ecuador's oil development began in the 1970s. Western multinational oil companies led the operation and adopted a more extensive development method. The environmental pollution...

Claims

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Application Information

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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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