Hydraulic hoisting device for replacing pipe column and wellhead part and method thereof

Abstract

The invention discloses a hydraulic hoisting device for replacing a pipe column and a wellhead part. The hydraulic hoisting device is provided with a hoisting system and a connecting mechanism, wherein the hoisting system is connected with a wellhead device to be replaced through the connecting mechanism; the hydraulic hoisting device further comprises a pipe column locking device which is mainly used for locking a downhole pipe column connected with the wellhead device; a method comprises the following steps: 1) mounting the hoisting system; 2) detaching the wellhead device; 3) assembling a wellhead four-way joint. By adopting the hydraulic hoisting device for replacing the pipe column and the wellhead part, wellhead replacement is carried out, and a pipe arrangement step is saved; the downhole pipe column only needs to be partially lifted, and then the downhole pipe column is locked by utilizing the matched pipe column locking device; then the whole weight of the downhole pipe column is transferred to an outer pipe, so that a wellhead can be replaced under the condition that the whole downhole pipe column is not detached, and furthermore, the working efficiency of wellhead maintenance work is effectively improved, and the maintenance time is reduced; the time consumption in a replacement process is only no more than 25 percent that of the prior art.

Description

technical field [0001] The invention relates to the field of workover operation technology and the like, in particular to a hydraulic lifting device and method for replacing pipe strings and wellhead components. Background technique [0002] Oil and gas extraction is the process of extracting oil and natural gas buried in underground oil layers from the ground. The way oil and gas are extracted from the ground to the surface can be divided into self-injection and artificial lift according to whether artificial energy needs to be added to the wellbore fluid. Artificial lift oil recovery includes: gas lift oil recovery, pumping unit rod pump oil recovery, submersible electric centrifugal pump oil recovery, hydraulic piston pump oil recovery and jet pump oil recovery, etc. [0003] In the process of oil and natural gas extraction, workover operation is an important link. Oil wells, gas wells and water wells may fail at any time during self-spraying, oil pumping, water injecti...

AI Technical Summary

Problems solved by technology

[0009] At present, when the pipe string is tripped, the pipe string is mainly lifted and tripped by the fixed lifting force of the workover rig. This operation method has a low degree of automation, requires many personnel, is labor intensive, low work efficiency, and has a long operation cycle. ,costly

When the pipe string is blocked during the lifting process, the work cannot be carried out due to the limited lifting force of the workover rig

[0010] Existing wellheads (such as figure 1 shown) mainly includes a wellhead flange 9 arranged on the outer pipe, on which a wellhead device 3 is arranged, and the inner pipe string 5 runs through the outer pipe, the wellhead flange 9 and the wellhead device 3 and is connected with the upper suspension device 11 connection, the weight of the pipe string 5 in the well is loaded on the upper suspension device 11, and the upper suspension device 11 is loaded on the wellhead device 3, and the wellhead device 3 is loaded on the outer pipe through the wellhead flange 9. The equipment lifts the wellhead device 3 together with the inner well pipe string, then lifts the inner well pipe string 5 section by section, and finally separates the inner well pipe string 5, wellhead device 3 and upper suspension device 11, and replaces the wellhead device 3. Then it will be decentralized to complete the entire replacement process. It usually takes several months to start this operation, which seriously lags behind the production efficiency.

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