Completion pipe string for suspending bottom water coning

Abstract

The invention relates to a completion pipe string for suspending bottom water coning. The completion pipe string for the suspending bottom water coning is characterized by comprising an underground casing pipe, a production pipe string is arranged on the upper portion of the underground casing pipe, and an L-shaped reducing casing pipe is arranged on the lower portion of the underground casing pipe. The top portion of the vertical section of the reducing casing pipe is fixedly connected inside the underground casing pipe through a casing pipe hanger, an annular clearance is reserved between the horizontal section of the reducing casing pipe and the wall of a well, and a diameter-expanding section with the pipe diameter bigger than those of the two ends of the horizontal section of the reducing casing pipe is arranged on the middle portion of the horizontal section of the reducing casing pipe, and namely, the annular clearance between the diameter-expanding section and the wall of the well is smaller than those between the horizontal sections at two ends and the wall of the well. A plurality of through holes are formed in the toe pipe wall between the tail end of the diameter-expanding section and the tail end of the horizontal section. The completion pipe string for the suspending bottom water coning solves the problems of balancing bottom hole pressure, suspending bottom water coning and prolonging the development period of an oil and gas well, plays an unexpected effect, and can be widely applied to the exploitation processes of various horizontal oil and gas wells.

Description

technical field [0001] The invention relates to a downhole completion pipe string in well completion and oil production engineering, in particular to a well completion pipe string capable of balancing the pressure distribution of production intervals and delaying bottom water coning. Background technique [0002] The bottom surface of the bottom water reservoir is all in contact with the bottom water, which is not only the superiority of the bottom water reservoir in development, but also the difficulty in the development of the bottom water reservoir. On the one hand, the contact area between the reservoir and the bottom water is large, the formation energy can be replenished from the bottom water in time, and the reservoir energy is sufficient; but on the other hand, in the production of horizontal wells, due to the pressure drop around the wellbore and the balance in the reservoir In the bottom water reservoir, the oil-water interface will deform and rise in a ridge shape...

AI Technical Summary

Problems solved by technology

Most of these completion methods require special tools, the operation process is complicated, and the on-site implementation is difficult, and it is often difficult to achieve the expected results in the end

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