Method for pulling out halogen discharging pipe

Abstract

The invention discloses a method for pulling out a halogen discharging pipe, which belongs to the technical field of a salt cavern underground gas reservoir. The method comprises the following steps:loading a cutting apparatus into a halogen discharging pipe, cutting the halogen discharging pipe by using the cutting apparatus, so that the lower end surface of the halogen discharging pipe is located in a first casing pipe; loading a first oil passing pipe expansion-type packer into the halogen discharging pipe until the first oil passing pipe expansion-type packer extends out of the halogen discharging pipe and seals the first casing pipe; and uplifting the halogen discharging pipe until the halogen discharging pipe is pulled out of the first casing pipe. According to the method for pulling out the halogen discharging pipe provided by the invention, when the halogen discharging pipe is uplifted, only the halogen discharging pipe in an oil pipe needs to be uplifted without driving the first oil passing pipe expansion-type packer to move upwards, and the high-pressure natural gas in an inner cavity of the salt cavern can be prevented from entering the upper part of the oil pipe, so that the abrasion for the first oil passing pipe expansion-type packer can be avoided, and the well control risk can be reduced.

Description

technical field [0001] The invention relates to the technical field of underground gas storage in salt caverns, in particular to a method for starting and discharging brine pipes. Background technique [0002] Salt cavern underground gas storage is a form of storing natural gas by using the thicker salt layer or salt dome underground to artificially create caves in the salt layer or salt dome to form a storage space. With the rapid development of society and economy, natural gas extraction technology has been continuously improved, so that its extraction volume has been continuously increased to better meet market demand. When the natural gas market demand is less than the natural gas extraction, in order to avoid the waste of natural gas, it is necessary to store the excess natural gas. At present, underground gas storage in salt caverns is usually built, and excess natural gas is stored by gas injection and brine exhaust. Wherein, gas injection and brine discharge means ...

AI Technical Summary

Problems solved by technology

[0005] Since the plugger has the risk of fixed parts failing to move up and sealing parts failing during the snubbing string, and the well control means during the snubbing period is relatively simple, there is a risk of natural gas flowing up the wellhead when the plugger fails, which increases the well control risk

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