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.
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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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