A kind of comprehensive treatment agent for offshore oil field produced fluid and preparation method thereof

Abstract

The invention discloses an integrated treatment agent for produced liquid of offshore oilfields and its preparation method. The integrated treatment agent is composed of comb-like multi-branched silicon-containing polyether, water-soluble multi-block polyether, synergist, alcohol and water. The ratio of the comb-like multi-branched silicon-containing polyether, the multi-block polyether, the synergist, the alcohol and the water is 10 to 30: 5 to 10: 0.5 to 2: 5 to 10: 30. The integrated treatment agent for the produced liquid of the offshore oilfields has the dual function of the demulsification and the water purification of the crude oil produced liquid, the demulsifier, the anti-demulsifier and the cleaning agent are replaced with one chemical, the produced liquid of the offshore oilfields is effectively treated, and the purpose for qualitative treatment of oil and water is achieved.

Description

technical field [0001] The invention relates to the field of oilfield chemicals, in particular to a comprehensive treatment agent for offshore oilfield production fluid and a preparation method thereof. Background technique [0002] With the continuous exploitation of crude oil and the application of production increase measures such as water injection in oil fields, many oil fields have entered a period of high water cut, and the water cut in Liuhua Oilfield, Wenchang Oilfield, Weizhou Oilfield, etc. located in the South China Sea has reached 90% It has entered the development stage of ultra-high water cut period, and crude oil dehydration has become a key link in the crude oil production process. So far, the methods used for crude oil dehydration at home and abroad can be summarized as: sedimentation separation, chemical demulsification, electric demulsification, and wetting and coalescence. Among them, the use of chemical demulsifiers for demulsification and dehydration i...

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Problems solved by technology

However, with the application of tertiary oil recovery techniques such as polymer injection and thermal recovery and various production stimulation measures, the physical properties of the produced fluid have changed greatly, and the degree of emulsification has become more serious. The capacity increases, and the mechanical impurities in free water increase. Under such complex emulsification conditions, conventional demulsifiers are no longer suitable, and the oil-water sedimentation separation speed slows down. Under the conventional separation temperature and time conditions, the oil content of sewage and the water content in oil They are all very high, and there is a serious oil-water intermediate transition layer during the separation process. It is difficult to eliminate the emulsion of the crude oil system by conventional demulsifiers, it is difficult to dehydrate the crude oil, the electric dehydration current remains high, and even trips. The electric dehydrator of the crude oil electric dehydrator will be broken down due to the problem of the emulsion; at the same time, the high oily sewage enters the sewage system, the sewage treatment equipment is seriously polluted, and the main indicators of the control of the production water system also deteriorate

The dosage of water purifying agent in the sewage system has increased sharply, generating a large amount of sludge, resulting in serious dirty and clogged filters in the production process, causing serious safety hazards in production

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