Method for rapidly reloading tool string and wellhead in under-pressure bridge plug and perforation combined work

Abstract

The invention discloses a method for rapidly reloading a tool string and a wellhead in under-pressure bridge plug and perforation combined work. A plug and pull type wellhead device is connected between a wellhead and a cable blowout preventing pipe, through a hydraulic control system, locking and unlocking actions of a female connector for a male connector can be achieved, the hydraulic control system is remotely controlled, automatic connection and separation of the cable blowout preventing pipe and the wellhead can be achieved, the cable blowout preventing pipe and a tool string are liftedto be close to or away from the wellhead, under the state that the cable blowout preventing pipe is kept vertical, the tool string is subjected to tripping operation for reloading, according to the method, a worker does not need to climb for manual wellhead reloading, a large amount of manpower does not need to be consumed for pulling the tool string from the cable blowout preventing pipe, the number of workers can be reduced by three to four, wellhead and tool string reloading can be easier and simpler, automatic reloading of the cable blowout preventing wellhead can be achieved directly through remote hydraulic pressure control, meanwhile, the link of reversing and erecting the cable blowout preventing pipe can be avoided, compared with the original method, the speed of the wellhead andtool string reloading process can be at least improved by 50%, and high efficiency is achieved.

Description

technical field [0001] The invention relates to the field of perforation and well completion, in particular to a method for quickly changing tool strings and wellheads in conjunction with bridge plug perforation under pressure. Background technique [0002] Large-scale staged fracturing technology is a key technology for the development of low-porosity and low-permeability unconventional oil and gas resources such as shale gas and tight oil and gas, and the combined technology of bridge plug and perforation under pressure is an important part of it. Under pressure bridge plug perforation joint operation means that under the premise of effective communication between the wellbore and the formation, the bridge plug and perforation tool string are transported to the downhole target layer through hydraulic pumping by means of cable transmission, and the bridge plug setting and perforation are completed. Multi-cluster perforation realizes downhole stratum segmentation and forms c...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the time-consuming and labor-intensive process of the existing pressurized bridge plug perforation combined tool string and wellhead replacement process, and also involve high-altitude, high-pressure operation risks, the purpose of the present invention is to provide a pressurized bridge plug perforation. The method of quickly changing tool strings and wellheads with hole joints helps to reduce the construction strength of bridge plug perforation joint operations under pressure, enhance the construction safety of bridge plug perforation joint operations under pressure, and improve the pressure of bridge plug perforation joint operations. Construction time limit

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