A method for quickly finding water in horizontal wells

Abstract

The invention provides a horizontal well rapid water exploration method. A screwed plug is connected with a Y211 packer, the upper end of the Y211 packer is connected with a screen pipe, and the upper end of the screen pipe is connected with an oil pipe. The upper end of the oil pipe is connected with an oil-well pump. According to the golden section principle, horizontal well packer setting position layouts with different spraying point numbers are established, and the setting position of the Y211 packer is determined from the layouts. According to the water containing fluctuation judgment rules, the pumping and sucking results are diagnosed, the spraying point water breakthrough possibility of the upper end or the lower end of the Y211 packer is excluded, and the like, the suspected water breakthrough spraying point range is decreased step by step till the water breakthrough spraying points are determined finally. According to the horizontal well rapid water exploration method, through upward lifting and downward putting for setting and unsetting, airtightness is good; the pumping and sucking liquid quantity of every time is the liquid quantity of the spraying points of the upper portion of the packer, and the problem that in single-section testing, the low liquid quantity is large in water containing fluctuation and difficult in dereferencing is solved; a down-hole testing pipe string structure is simple, reliable in overall performance, low in cost and small in drilling jamming risk; and the diagnosis method is scientific and reasonable, section-by-section testing is not needed, the water exploration speed is high, the period is short, and the cost is low.

Description

technical field [0001] The invention relates to a method for quickly finding water in a horizontal well, which is suitable for finding water in horizontal wells with single-stage water discharge or multi-stage water discharge but serious single-stage water discharge. Background technique [0002] The commonly used testing methods for water detection in horizontal wells mainly include liquid production profile testing, neutron lifetime testing, and neutron oxygen activation testing. Due to the limitations of the process principle, the liquid production profile test is mainly suitable for single-stage liquid volume higher than 5m 3 / d horizontal well water search, neutron lifetime test is suitable for water search in horizontal wells with short water breakthrough time and high salinity of produced water, neutron oxygen activation test is suitable for water search in horizontal wells with large flow rate and high water content, For water exploration in horizontal wells in ultr...

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Problems solved by technology

[0003] The disadvantages of the above-mentioned technologies are: dragging and sealing the pipe string is only suitable for wells with high pressure in the outlet section after water breakthrough. Due to the fluctuation of the bottom hole pressure, the risk of unsealing is high and the reliability of setting is low; The breaker needs to be tested section by section, the water search period is long, and the efficiency is low; the combination of multiple packers is used, the downhole test tube string is long, the structure is complex, and the risk of pipe sticking is high

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