A membrane material downhole oil-water separation device and production string and oil-water separation method

Abstract

The invention discloses a film material downhole oil-water separating device and a production pipe column and oil-water separation method. The film material downhole oil-water separating device is a film material work cylinder mounted in a downhole production pipe column. The film material work cylinder comprises an outer cylinder, a hydrophobic and lipophilic net film, a hydrophile and oleophobicnet film and a salvage head. According to the film material downhole oil-water separating device and the production pipe column and oil-water separation method, through the film material work cylinder, the whole downhole production pipe column is partitioned into three channels, namely, the produced liquid entering channel, the oil-phase lifting channel, and the water-phase back injection channel; through an inner film material and the channels, the functions of separation of an oil phase and a water phase in the work cylinder, oil-phase lifting and water-phase back injection are achieved; the work cylinders can be used in a multi-stage parallel connection mode according to different liquid producing quantities; the film material work cylinder does not need to be equipped with a complex auxiliary facility, operation is easy, the film material work cylinder is located behind an electric submersible pump in a regular pipe column, a salvage connector is formed, and regular salvaging replacement of the net film material can be achieved; meanwhile, a back-injected water oil-containing monitoring device is arranged in the back injection channel, and real-time online monitoring of the water quality of back-injected water can be achieved; and the film material downhole oil-water separating device and the production pipe column and oil-water separation method have the advantages that the application range is wide, and the separating effect is good.

Description

Technical field [0001] The invention relates to downhole oil-water separation, in particular to a membrane material downhole oil-water separation device and a production pipe string and oil-water separation method. Background technique [0002] The conventional oil-water separation technology mainly includes gravity separation, hydrocyclone, air flotation, coagulation degreasing, and membrane structure according to the separation method. Among them, the hydrocyclone separation is to generate the cyclone through the tangential inlet or the guide vane structure. Due to the difference in the density of the oil and water, the centrifugal force is different to realize the separation of the two. Membrane structure oil-water separation uses the characteristics of hydrophobic and lipophilic or hydrophilic and oleophobic materials to allow the single passage of oil and water to achieve the separation of oil and water. [0003] In recent years, as the produced water has been increasing year...

AI Technical Summary

Problems solved by technology

"CN106837294A Super-hydrophobic Downhole Oil-Water Separator and Its Same Well Injection and Production Process String" is a retrieved patent document about downhole membrane material oil-water separation technology, in which the membrane material is a hydrophobic material, and the cleaning and replacement function of the membrane material is not considered ; Its functional string structure is complex, consisting of multi-stage check valves, separation trays, etc.; its power system is a sucker rod with small displacement; and the applicable range of this membrane material string structure is relatively narrow

Images