A liquid drainage and gas extraction operation system and operation method suitable for engineering ships

Abstract

The invention discloses an operating system and an operating method for liquid drainage and gas extraction suitable for engineering ships. The liquid drainage and gas recovery operation system includes a high-pressure riser and a coiled tubing; one end of the high-pressure riser is connected to an underwater wellhead, and an underwater blowout preventer is arranged at the underwater wellhead; the other end of the high-pressure riser extends to the engineering ship; continuous The tubing is set in the high-pressure riser, one end of the coiled tubing extends to the wellbore, and the other end extends to the outside of the high-pressure riser; the annulus formed between the high-pressure riser and the coiled tubing and the coiled tubing form a liquid drainage and gas production mechanism. Circulation channel; the high-pressure riser is equipped with a cross, the third branch of the cross is connected with the liquid recovery tank, and the fourth branch is connected with the choke and kill pipeline; the free end of the coiled tubing is connected with the liquid storage tank . The invention can be used not only on conventional drilling operation ships but also on engineering ships, has strong adaptability, flexible and convenient operation, and can be widely used in drilling, completion and workover operations of deep-water oil and gas fields adopting the underwater wellhead development mode.

Description

technical field [0001] The invention relates to a liquid drainage and gas recovery operation system and an operation method suitable for engineering ships, and belongs to the technical field of liquid drainage and gas recovery of natural gas wells developed by underwater wellheads. Background technique [0002] Subsea wellheads are commonly used equipment for the development of offshore oil and gas fields. During the production process of natural gas wells developed using the subsea wellhead mode, a large amount of liquid may occur, resulting in the accumulation of liquid when the gas well cannot be carried to the wellhead by the gas flow. Liquid accumulation is caused, which causes the gas to be pressed downhole by the liquid and cannot enter the wellbore for normal gas production. At this time, it is necessary to carry out workover operations, adopt liquid drainage and gas production operations, and drain the wellbore liquid out of the wellbore, and reintroduce the downhole...

AI Technical Summary

Problems solved by technology

This method of operation requires the floating equipment to have a riser system and a complex tension system. Generally, only large-scale floating drilling equipment can meet the operating conditions. In general, liquid drainage and gas recovery operations are relatively simple repairs. For well operations, if large-scale floating drilling equipment is used, the cost of workover operations will inevitably increase, which will affect the benefits of oilfield development

Ordinary engineering ships cannot meet the conventional liquid drainage and gas recovery process.

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