Bottom water reservoir horizontal well variable-parameter perforation water-controlled completion method and device

Abstract

The invention provides a bottom water reservoir horizontal well variable-parameter perforation water-controlled completion method and device and relates to the technical field of horizontal well water-controlled completion. The method comprises the steps of setting a water controlling unit dividing strategy and a perforation unit dividing strategy; generating a horizontal well-controlled segment water content profile predicting model, and determining the liquid production capacity of each water controlling unit enabling each water controlling unit to reach target limit water cut at the same time; determining the overall perforation skin factor of all the perforation units enabling near-well additional seepage pressure drop to reach the minimum under a preset perforation bullet condition, and determining the perforation bullet combination of all the water controlling units enabling perforation density rounding error to reach the minimum; determining the perforation density of each perforation unit; conducting bottom water reservoir horizontal well variable-parameter perforation water-controlled completion. By the adoption of the method and device, the problem of the prior art that due to the fact that premature water breakthrough occurs on part of horizontal well segments or water content of part of horizontal well segments is too high, water content of an oil well increases sharply and reaches limit water cut too early, and then well segments on which water breakthrough has not occurred yet and low-water-content well segments can not be utilized effectively can be solved.

Description

technical field [0001] The invention relates to the technical field of water-controlled completion of horizontal wells, in particular to a method and device for variable-parameter perforation and water-controlled completion of horizontal wells in bottom water reservoirs. Background technique [0002] In oil and gas recovery technology, horizontal wells are widely used in the development of bottom water reservoirs due to their advantages such as long production intervals, large control area of ​​production zones, and small production pressure difference. Affected by factors such as wellbore pressure loss and reservoir heterogeneity, there are problems such as premature breakthrough of local bottom water, rapid rise of water cut in oil wells, and unbalanced production of crude oil in reservoirs during the development of bottom water reservoirs by horizontal wells. How to stabilize oil and control water and ensure the balanced production of reservoirs to the greatest extent has...

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Problems solved by technology

[0005] The embodiment of the present invention provides a method and device for variable parameter perforation and water control completion of horizontal wells in bottom water reservoirs to solve the problem of premature water breakthrough or high water cut in some horizontal well sections in the prior art. The water cut rises sharply, and the limit water cut is reached prematurely, so that the well section with no water or low water cut cannot be effectively produced

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