A method for synergistically cleaning oil-based mud by using cloud point and in-situ emulsification and a matching cleaning agent

A cleaning agent and cleaning oil technology, applied in the directions of detergent compounding agents, chemical instruments and methods, detergent compositions, etc., to achieve the effects of good temperature resistance, improved cleaning effect, and increased solubilization amount

Active Publication Date: 2021-06-29
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing micro-emulsion and nano-emulsion cleaning agents for cleaning wellbore oil pollution need to be prepared in advance and then pumped downhole

Method used

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  • A method for synergistically cleaning oil-based mud by using cloud point and in-situ emulsification and a matching cleaning agent
  • A method for synergistically cleaning oil-based mud by using cloud point and in-situ emulsification and a matching cleaning agent
  • A method for synergistically cleaning oil-based mud by using cloud point and in-situ emulsification and a matching cleaning agent

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0043] In the cleaning agent, the first nonionic surfactant is Lutensol FT M 5, and the second nonionic surfactant is selected from at least one of Lutensol ON 30, Lutensol ON 80 and Lutensol ON 110.

[0044] In the cleaning agent provided in Embodiment 1, the content weight ratio of the first nonionic surfactant to the second nonionic surfactant is 1:0.25-0.67.

specific Embodiment approach 2

[0046]In the cleaning agent, the first nonionic surfactant is Lutensol FT M 5, the second nonionic surfactant is Lutensol ON 80, and the cloud point enhancer is selected from fatty alcohol polyoxyethylene ether sodium sulfate at least one of them. In a particularly preferred case, the fatty alcohol polyoxyethylene ether sodium sulfate described in the present invention is the fatty alcohol polyoxyethylene ether sodium sulfate mixture provided by BASF.

[0047] In the cleaning agent provided in Embodiment 2, the content weight ratio of the first nonionic surfactant, the second nonionic surfactant and the cloud point improver is 1:0.25-0.67:0.25 -0.33.

[0048] The inventors found that the cleaning agent provided in the above preferred embodiments has higher solubilization amount of wellbore oil pollution and better cleaning effect of oil pollution.

[0049] In the present invention, there is no strict requirement for the water phase, which can be deionized water, distilled wa...

specific Embodiment approach

[0059] In the present invention, according to a preferred embodiment, the method for synergistically cleaning oil-based mud by cloud point and in-situ emulsification comprises the following steps:

[0060] (1) The cleaning agent described in the first aspect is transported to the bottom of the well to be cleaned, and the cloud point temperature of the cleaning agent is not higher than the temperature of the bottom of the well;

[0061] (2) soaking the downhole oily casing and / or the well wall in the cleaning agent for 5-20min and flushing for 5-15min to obtain a cleaning solution containing oily dirt;

[0062] (3) Return the oil-containing cleaning fluid to the wellhead.

[0063] In the present invention, the cleaning agent is directly transported to the bottom of the well to be cleaned without pre-preparing into a micro-emulsion or a nano-emulsion, avoiding the pre-incorporation of the oil phase, and improving the solubilization amount of oil pollution in the wellbore.

[00...

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Abstract

The invention relates to the technical field of oil and gas drilling, and discloses a method for synergistically cleaning oil-based mud by using cloud point and in-situ emulsification and a matching cleaning agent, the cleaning agent contains the first non-ionic substances that are stored in combination or independently. A surfactant, a second nonionic surfactant and an aqueous phase, optionally containing a cloud point raising agent. The cleaning agent and its cleaning method for synergistically cleaning oil-based mud using cloud point and in-situ emulsification provided by the present invention can reduce workload and cost, increase the amount of solubilization of oil stains, and have high efficiency by virtue of the cloud point effect and the emulsion phase inversion effect. Oil cleaning effect.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a method for synergistically cleaning oil-based mud by using cloud point and in-situ emulsification and a matching cleaning agent. Background technique [0002] Oil-based mud has absolute advantages in stabilizing well walls, lubricating and preventing sticking, and resisting temperature and pollution. It is an important means for drilling shale gas horizontal wells, deep wells and ultra-deep wells. However, the oil-based mud and its filter cake remaining in the wellbore during well completion are difficult to remove, which affects the quality of cementing. The oily cuttings produced pollute the environment and are difficult to handle, which ultimately damages the benefits of oil and gas production. [0003] At present, the effective removal of wellbore oil stains and oily drill cuttings mainly relies on chemical methods, and the cleaning agents involved mainly inclu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524E21B37/06C11D1/825C11D1/83C11D3/20
CPCC09K8/524C11D1/22C11D1/28C11D1/29C11D1/66C11D1/825C11D1/83C11D3/201C11D3/2017E21B37/06
Inventor 蒋官澄任妍君白杨张智
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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