Fishing tool for natural gas extraction downhole throttle device and operation method of fishing tool

Abstract

The invention discloses a fishing tool for a natural gas extraction downhole throttle device and an operation method of the fishing tool. The fishing tool for the natural gas extraction downhole throttle device is designed in order to achieve the purposes of enabling the throttle device to finish fishing operations by means of self energy, lowering operation risks and improving fishing success rate. The fishing tool for the natural gas extraction downhole throttle device mainly comprises a connecting pipe, a joint, a spring, a locking sleeve, a flat spring, a slip and the like, wherein the connecting pipe connects a projector, a connector and a mandrel, the joint is arranged below the connecting pipe, the spring and the locking sleeve are arranged inside the joint, and the flat spring and the slip are arranged on the locking sleeve. Through the working procedure operations of release of the throttle device, throwing of the fishing tool, installation of a well mouth device, well opening production and finish of fishing, the fishing tool enables the slip to keep a withdrawn state, pushes the throttle device to move upwards by means of energy of a gas well, and bears upward pushing force far larger than pulling force of a steel wire, thereby largely reducing the operation risks and substantially improving the fishing success rate of the throttle device.

Description

technical field [0001] The invention relates to a fishing tool for a downhole choke in natural gas exploitation and an operating method thereof, belonging to the technical field of oilfield gas extraction. Background technique [0002] In natural gas exploitation, in order to meet the requirements of gas production pressure reduction, production limitation and energy saving, throttling devices are installed underground in gas wells. The downhole choke device widely used in the Sulige gas field is the slip type downhole choke. This kind of choke relies on steel wire running, slip positioning, rubber cylinder sealing and gas nozzle production ratio to realize wellbore natural gas throttling and pressure reduction. . [0003] In field application, in order to meet the production demand, it is necessary to adjust the production of the gas well, or in order to fully exert the production capacity of the gas well, it is necessary to fish the choke from the wellbore in the later st...

AI Technical Summary

Problems solved by technology

At present, the slip-type choke fishing tool is commonly used. With the long-term use of the choke, the sealing rubber sleeve will undergo permanent deformation, which will increase the friction between the rubber sleeve and the well wall, resulting in the lifting force during the fishing process. Larger, it is easy to cause underground accidents

Since the general lifting force of ordinary steel wire operations of fishing tools cannot be greater than 300kg, the difficulty of fishing is even greater.

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