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Drilling fluid system for deep well drilling, and preparation method thereof

A drilling and fluid technology, applied in the field of oil and gas exploration and development, can solve the problems of difficult degradation, biological toxicity, and excessive heavy metal ions, and achieve the effects of reducing invasion, reducing biological toxicity, and preventing excessive heavy metals from exceeding the standard.

Active Publication Date: 2021-11-02
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiments of the present disclosure provide a drilling fluid system for deep well drilling and a preparation method thereof, which can overcome the problems that the drilling fluid system used in deep well drilling is difficult to degrade, has biological toxicity, and excessive heavy metal ions

Method used

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  • Drilling fluid system for deep well drilling, and preparation method thereof
  • Drilling fluid system for deep well drilling, and preparation method thereof
  • Drilling fluid system for deep well drilling, and preparation method thereof

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Embodiment Construction

[0037] In order to make the purpose, technical solution and advantages of the present disclosure clearer, the implementation manners of the present disclosure will be further described in detail below in conjunction with the accompanying drawings.

[0038] An embodiment of the present disclosure provides a drilling fluid system for deep well drilling. The drilling fluid system includes the following components: 90-100 parts of water, 2-5 parts of bentonite, 3-6 parts of pH regulator, 6-10 1-6 parts of acrylate copolymer, 1-6 parts of polyurethane polymer, 1-5 parts of allyl alcohol acrylic acid copolymer, 0.2-0.5 parts of surfactant, 4-20 parts of potassium chloride, 4-20 parts sodium chloride, 0.1-3 parts of polyacrylamide potassium salt and 0.1-3 parts of zwitterionic polymer strong coating agent.

[0039] When the drilling fluid system provided by this example is used for deep well drilling, since the acrylate copolymer is introduced into the drilling fluid system as a flui...

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Abstract

The embodiment of the invention provides a drilling fluid system for deep well drilling, and belongs to the technical field of oil-gas exploration and development. The embodiment of the invention provides the drilling fluid system for deep well drilling. The drilling fluid system comprises 90 to 100 parts of water, 2 to 5 parts of bentonite, 3 to 6 parts of a pH regulator, 6 to 10 parts of an acrylate copolymer, 1 to 6 parts of a polyurethane polymer, 1 to 5 parts of an allyl alcohol-acrylic acid copolymer, 0.2 to 0.5 part of a surfactant, 4 to 20 parts of potassium chloride, 4 to 20 parts of sodium chloride, 0.1 to 3 parts of polyacrylamide potassium salt and 0.1 to 3 parts of a zwitterionic polymer strong coating agent. When the drilling fluid is used for drilling, hydration expansion and dispersion of shale can be effectively prevented, collapse of well walls can be prevented, and the drilling fluid is highly environment-friendly, free of biotoxicity, easy to degrade and free of heavy metal.

Description

technical field [0001] The disclosure belongs to the technical field of oil and gas exploration and development, in particular to a drilling fluid system for deep well drilling and a preparation method thereof. Background technique [0002] Drilling fluid refers to the general term of various circulating fluids that meet the needs of drilling work during oil and gas drilling. It is indispensable in the drilling process and is called the blood of drilling. Drilling fluid needs to carry and suspend cuttings, stabilize the well wall and control formation pressure, cool and lubricate the drill bit, transmit hydropower, obtain underground information, etc., so it is necessary to add corresponding drilling fluid treatment agents with various functions . Drilling fluid treatment agents can be divided into anti-slump agents, fluid loss reducers, plugging agents, shale inhibitors, viscosity reducers, lubricants, high-temperature stabilizers, etc. according to their functions. Fluid...

Claims

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Application Information

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IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/12Y02P20/141
Inventor 黎然王锐邓天东杨欢向斌杨攀陈龙张佳寅
Owner PETROCHINA CO LTD
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