Plug-in coiled tubing induced-spraying device

Abstract

The invention discloses a plug-in coiled tubing induced-spraying device, which comprises an outer tubular column, a coiled tubing and a coiled tubing injector, wherein the coiled tubing is fed inside the outer tubular column through the coiled tubing injector; a locating seal working barrel is arranged in the outer tubular column; the periphery of the locating seal working barrel is matched with an inner periphery of the outer tubular column in a sealing way; an inserted sealing rod is arranged at the lower end of the coiled tubing; the inserted sealing rod is provided with a through hole communicated with the coiled tubing along the axial direction; and the inserted sealing rod is inserted into the seal work barrel when the coiled tubing injector feeds the coiled tubing downwards to a preset position in the outer tubular column, and the periphery of the inserted sealing rod is matched with the inner periphery of the locating seal working barrel in the sealing way. According to the device, the problems that water seepages at the stratum and the liquid carrying effect of a large-diameter tubular column is not ideal in a gas well test can be solved, and common gas lift induced spraying, production seeking and testing also can be carried out, so as to achieve the multifunctional purpose of the tubular column.

Description

technical field [0001] The invention belongs to the technical field of formation testing of oil and gas wells, in particular to a plug-in coiled tubing induced blowout device for testing of oil and gas wells. Background technique [0002] At present, in oil and gas well testing operations, coiled tubing is mainly used for gas-lift induced blowout operations in low-porosity and low-permeability reservoirs. The remaining liquid cushion or formation water is brought out of the ground, so that the formation productivity can be obtained. When the formation water output is large, the formation fluid is not enough to carry the formation water to the surface, which will cause liquid accumulation inside the pipe string, which will cause back pressure on the formation instead, and the real production capacity of the formation can never be obtained or lead to production failure. Relying on coiled tubing gas lift to discharge liquid, the gas lift operation takes a long time and will be...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to avoid the deficiencies in the prior art and provide a plug-in coiled tubing induced blowout device, which can solve the problem of unsatisfactory liquid-carrying effect of large-diameter pipe strings when oil and gas wells are tested. Gas lift induction, production and testing have achieved the purpose of multiple functions of the string

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