Hanging and tensioning device, production tubular column and tensioning and tie-back method of coiled tubing

Abstract

The invention relates to a hanging and tensioning device, a production tubular column and a tensioning and tie-back method of a coiled tubing. The hanging and tensioning device of the coiled tubing comprises a hanging mechanism and a tensioning mechanism. The hanging mechanism comprises a radish head arranged outside the coiled tubing in a sleeved mode, a radish head seat arranged outside the radish head in a sleeved mode, a tie-back connector arranged between the radish head and the coiled tubing, a clamping tile capable of abutting against the tie-back connector is arranged between the radish head and the coiled tubing, and a fishing neck is arranged in the tie-back connector. The tensioning mechanism comprises a safety relief connector arranged on the coiled tubing and a casing collar locator connected with the safety relief connector. The tensioning mechanism enables the production tubular column of the coiled tubing to be in a tensioning state in an oil gas well, putting, fishing and well logging work of the coiled tubing can be achieved, the work time is reduced, and the work cost is reduced. The hanging and tensioning device of the coiled tubing can create convenience for the coiled tubing pulling out with pressure through a downhole tool with a large diameter of 130 mm.

Description

technical field [0001] The invention relates to a production pipe string of an oil and gas well, in particular to a suspension tensioning device for a coiled tubing, a production pipe string and a tensioning tie-back method thereof. Background technique [0002] At present, there are mainly two types of production strings for oil and gas wells, one is traditional coupling tubing, and the other is coiled tubing as production strings. [0003] There are two ways to run the traditional coupling tubing. One is to use the traditional method to run the tubing. Because the oil and gas reservoirs in the well are under pressure, in order to prevent blowout accidents, the well must be killed before the operation, and then the production string should be run. After the running-in work of all production strings is completed, the well must be killed and the blowout can be replaced before production can be resumed. The disadvantage is that if the formation is contaminated, large-scale pr...

AI Technical Summary

Problems solved by technology

The disadvantage is that if the formation is contaminated, large-scale stimulation measures such as fracturing and acidification are required to restore the production capacity of the oil well

Another method is to use the method of snubbing workover operation, which requires a special snubbing device; its advantage is that it does not need to kill the well before operation, it is easy to resume production after operation, and the process is simple; its disadvantage is that the construction operation time is long, At the same time, the diameter of the coupling pipe is large, and when the pressure in the well is high, operating equipment with high pressure bearing capacity is required, so the risk of long-term operation under pressure is greater

[0004] The patent application number is 200820065072.4. The coiled tubing is used as the wellhead suspension mechanism of the production string, and the coiled tubing is realized as the production string; the advantage is that no killing operation is required before and during the operation, the construction process is simple, and the operation speed is fast ; Its shortcoming has two, and one is that the coiled tubing production string is in the bent state in the oil well, and the coiled tubing steel wire and cable operation cannot be lowered normally, and operations such as steel wire fishing and well logging cannot be realized through the coiled tubing; When the coiled tubing production string is produced, well killing operations are still required, and the coiled tubing cannot be connected back under pressure, and the coiled tubing production string cannot be pulled out under pressure, which may still cause secondary pollution of the formation, and the coiled tubing cannot be used as a role in subsequent production. Advantages of Production Strings

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