Open hole gravel packing tool and open hole gravel packing method for horizontal well

Abstract

The invention discloses an open hole gravel packing tool for a horizontal well and a use method thereof. An oil layer is packed from top to bottom by adopting the open hole gravel packing tool for the horizontal well. In a packing process, a sand-carrying fluid enters through an oil pipe; specific to the aim of preventing a suction valve from being closed, the sand-carrying fluid is not allowed to flow through the suction valve, can only enter an annulus between an outer pipe column and a service tool through a packing hole of the packing tool of the service tool, and enters an open hole section oil layer through a fluid outlet hole in a packing sliding bush; and sand in the sand-carrying fluid is blocked in the oil layer through a sieve tube, the fluid enters a sand-prevention outer pipe column through the sieve tube, continually flows upwards after entering the service tool from a bottom sealed lower end hole, enters double barrels of the packing tool as well as a packing annular space formed by a central pipe and an outer layer pipe which are communicated with the double barrels, enters annuluses of a casing and the service tool through a return hole in the packing tool, and returns to the ground till packing from top to bottom is completed.

Description

technical field [0001] The invention relates to a sand control tool for oil production wells and a use method thereof, in particular to a horizontal well open hole gravel filling tool and a filling method. Background technique [0002] Generally, oil wells are divided into: vertical wells, inclined wells, and horizontal wells. Vertical wells are designed to be vertical wells with a well inclination angle close to 0; inclined wells are shafts with a certain inclination angle connecting the ground and underground roadways; horizontal wells are The inclination angle reaches or approaches 90°, and the well depth is drilled along the horizontal direction. [0003] At present, most of the horizontal well gravel packing tools used in China are bottom packing tools, that is, the completion fluid starts from the bottom of the pipe string and fills from bottom to top, which has made a great contribution to the sand control technology of oil production. At the same time, this tool als...

AI Technical Summary

Problems solved by technology

At the same time, this tool also has shortcomings and deficiencies: ① During the operation, the pressure of the hydrostatic column cannot always act on the well wall, resulting in the risk of instability of the well wall; the well wall before filling may appear incomplete If the ball seat is sealed by shearing the ball seat after the seat seal, it is easy to produce water hammer on the formation; if the backwash ball method is used, it is difficult to Ball washing, large displacement will cause scour to the well wall, thereby increasing the leakage, which will directly affect the filling effect and cause formation pollution; ③ long horizontal section filling operation will cause high circulation pressure; circulation When the pressure is higher than the formation pressure, it will cause leakage and local sand removal; ④ If the leakage after filling operation is large, the return speed cannot meet the requirements of reverse cycle cleaning, resulting in difficulty in backwashing, large leakage, and even tool sand sticking

Images