Sidetracking well suspension-free releasing well cementation and completion device

Abstract

The invention relates to a sidetracking well suspension-free releasing well cementation and completion device. The sidetracking well suspension-free releasing well cementation and completion device comprises a sidetracking well casing pipe, a left-hand releaser arranged on the sidetracking well casing pipe, and a reverse circulation valve capable of being automatically opened and closed and a one-way cup packer, wherein the one-way cup packer is in threaded connection with the sidetracking well casing pipe; the reverse circulation valve capable of being automatically opened and closed is arranged above the one-way leather cup packer; and the left-hand releaser is arranged above the reverse circulation valve capable of being automatically opened and closed. The sidetracking well suspension-free releasing well cementation and completion device has the advantages that a well completion casing pipe is used and tripped in at one time, the integrity of a shaft is high, meanwhile, shaft leakage points are reduced, and the smoothness of the later fracturing construction is ensured; the construction link of the well completion operation is simplified; and the construction cost and the tripping-in risk caused by a suspender are reduced. The later releasing success rate is high, and the tripping-in of a flow string is not affected.

Description

technical field [0001] The invention belongs to the technical field of sidetracking wells in old wells in oil fields, and in particular relates to a suspension-free and disposable cementing and completion device for sidetracking wells. Background technique [0002] At present, the sidetracking of old wells in domestic oilfields is generally completed by suspension cementing. Most of the hangers do not have the function of tie-back after being lost, resulting in the upper part of the hanger after completion. The original well casing; Later stage fracturing pressure, displacement and technology are limited. Although the hanger with tie-back function can meet the tie-back function after abandonment, so as to form a new wellbore, it needs to run in the drill pipe, pull out the drill pipe after hanging and throwing it away, and then connect it with the completion casing Tie-back tool complete and lost-hand tool tie-back. Under this completion method, there are uncertainties in ...

AI Technical Summary

Problems solved by technology

Under this completion method, there are uncertainties in the tightness of the tie-back and whether it can be thrown away again in the later stage

However, the non-suspension method cannot control the return height of the cement slurry in the annular space, which may cause the hand to be solidified by the cement and cannot be thrown away; at present, the reverse circulation valves commonly used at home and abroad that can provide reverse circulation channels generally adopt two structures: One is the hydraulic one-time opening, that is, when the external pressure of the reverse circulation valve is higher than the internal pressure, the piston moves down and the reverse circulation channel is opened. After the annular pressure is relieved, the piston cannot be reset, that is, the channel cannot be closed, resulting in the failure of the oil sleeve to connect to the next step of construction. The second is that there is no hydraulic mechanism, and special switch tools need to be connected with steel wires or cables to realize the switch of the reverse circulation channel. Although this structure can realize multiple switches of the circulation channel, it needs the cooperation of auxiliary steel wires or cable cars, and the construction cost is high. , the construction process is cumbersome

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