Mechanical locking device for packer

Abstract

A mechanical locking device for locking a packer after set packing comprises two parts, namely an anchor mechanism and a time delay mechanism. The mechanical locking device comprises an upper connector, a spline mandrel, an upper cone, a sleeve, a slip dog, a spline outer barrel, a valve mandrel, an outer barrel, a lower connector and other parts. The time delay mechanism is used for guaranteeing the packer to be operated firstly when in set packing and guaranteeing the lifting force not to act on the packer in a short time when a pipe column is lifted up.

Description

Technical field

[0001] The utility model relates to a mechanical locking device for locking a packer after setting, which belongs to the field of petroleum exploitation. Background technique

[0002] In oil and gas development, formation testing is widely used as a means to evaluate formations. In conventional well testing, the most widely used is the multi-flow testing tester, which realizes downhole opening and closing of the well by lifting and lowering the string to achieve the purpose of testing wood. In the past, in order to achieve the purpose of not opening the VR bypass or unpacking the packer even if the multi-flow tester was transposed during well operation, many auxiliary tools were equipped in the test string, such as hydraulic locking, telescopic joints, drill collars, etc. Adding drill collars also increases the labor intensity, and the weight of drill collars is limited. During the test, due to the aging of the multi-stream tester’s displacement spring and ...

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