Device assembly for horizontal well temporary well plugging operation through coiled tubings and use method

Abstract

The invention discloses a device assembly for horizontal well temporary well plugging operation through coiled tubings and a use method. According to the main points of the technical scheme, the device assembly comprises a coiled tubing vehicle, and a single-machine well cementation vehicle or a double-machine well cementation vehicle. The coiled tubing vehicle comprises a vehicle head, a control cabinet, a power system, a roller, the 2-inch coiled tubing, the 2.375-inch coiled tubing, an injection head and corresponding parts, wherein the injection head and the corresponding parts are connected to the 2.375-inch coiled tubing. The single-machine well cementation vehicle or the double-machine well cementation vehicle comprises a vehicle head, a power system, an instrument control system and a metering liquid tank. The coiled tubing vehicle is matched with the single-machine well cementation vehicle or the double-machine well cementation vehicle for the temporary well plugging operation process including the steps of well tripping, bridge plug running, continuous cement plug injection and reverse circulation well flushing. By adoption of the device assembly and the use method, one-time continuous cement plug injection (the vertical thickness is larger than 200 m, and the along hole depth length is larger than 300 m) for a horizontal well can be achieved, the construction period is greatly shortened, the process complexity degree is lowered, the well control safety risk is reduced, and operation cost is saved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for integrating and using a coiled tubing temporary well closure operation device for a horizontal well. Background technique [0002] In the process of exploration and development of oil and gas fields, because the oil and gas wells have not yet reached the test production conditions, or the gathering and transportation pipeline network system has not yet met the export requirements, or due to abnormal well conditions, the wells need to be shut down for a long time. In order to prevent potential safety hazards such as heavy property loss and casualties caused by oil and gas wells out of control due to failure of wellhead devices, a temporary well closure method is adopted. [0003] Traditional temporary well closure uses tubing to set bridge plugs or cement plugs. During the temporary well closure operation, it is necessary to lift and lower the tu...

AI Technical Summary

Problems solved by technology

[0003] Traditional temporary well closure uses tubing to set bridge plugs or cement plugs. During the temporary well closure operation, it is necessary to operate the tubing string multiple times under pressure. The operation process is complicated, the construction period is long, and the safety risk of well control is high.

Moreover, in the process of cement plugging, it is impossible to continuously inject cement plugs and accurately measure the amount of cement. Only after all the cement slurry has been replaced into the annulus of the oil casing can the oil pipe be lifted to the surface of the cement slurry. If thickening or abnormal working conditions fail to pull out the oil pipe in time, the oil pipe will be solidified in the cement slurry and the accident of "flag pole" will occur

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