Method for synergistically cleaning oil-based mud by utilizing cloud point and in-situ emulsification and matched cleaning agent

A cleaning agent, cleaning oil technology, applied in the directions of detergent compounding agent, chemical instrument and method, detergent composition, etc.

Active Publication Date: 2020-10-27
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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  • Method for synergistically cleaning oil-based mud by utilizing cloud point and in-situ emulsification and matched cleaning agent
  • Method for synergistically cleaning oil-based mud by utilizing cloud point and in-situ emulsification and matched cleaning agent
  • Method for synergistically cleaning oil-based mud by utilizing cloud point and in-situ emulsification and matched 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 raising agent is selected from fatty alcohol polyoxyethylene ether sodium sulfate at least one of the Particularly preferably, 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 raising agent 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 a higher solubilization capacity of wellbore oil stains and a more excellent oil stain cleaning effect.

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

specific Embodiment approach

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

[0060] (1) The cleaning agent described in the first aspect above 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 at the bottom of the well;

[0061] (2) Soak the downhole greasy casing and / or well wall in a cleaning agent for 5-20 minutes, and rinse for 5-15 minutes to obtain a cleaning solution containing oil;

[0062] (3) Return the cleaning liquid containing oil to the well head.

[0063] In the present invention, the cleaning agent is directly delivered to the bottom of the well to be cleaned without pre-preparing into microemulsions or nanoemulsions, avoiding the pre-incorporation of the oil phase, and can increase the solubilization of wellbore oil pollution.

[0064] Secondly...

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Abstract

The invention relates to the technical field of oil-gas drilling and discloses a method for synergistically cleaning oil-based mud by utilizing cloud point and in-situ emulsification and a matched cleaning agent. The cleaning agent contains a first non-ionic surfactant, a second non-ionic surfactant and a water phase which are stored in a mixed manner or independently stored respectively, and optionally contains a cloud point improver. According to the cleaning agent for synergistically cleaning the oil-based mud by utilizing cloud point and in-situ emulsification and the cleaning method of the cleaning agent, the workload and the cost can be reduced by virtue of a cloud point effect and an emulsion phase inversion effect, the solubilizing amount of oil stains is increased, and an efficient oil stain cleaning effect is achieved.

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 Applications(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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