RU2418940C1 - Installation for continuous well and wellhead plugging-back - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: installation consists of accumulator of plugging material communicated to plugging material loading hopper via hydro-controlled gate. Also, by means of hydro-controlled gates the structure of the accumulator consists of a pipe on one end connected to a pipeline communicated with an emergency well, and on another end - with a pressure pipeline of a pump unit. A part of the accumulator pipe has orifices and is pressure tight enclosed into a ferrule in form of a tube, internal cavity of which is connected to an evacuation cavity of a jet pump. The jet pump is equipped with a fluid supply pipeline. It can be shut off by means of the hydro-controlled gate. Also, the jet pump is equipped with a liquid withdrawal pipeline. The accumulator is mechanised filled with plugging material from the hopper due to evacuation created when a flow of liquid passes through the jet pump. The plugging process is controlled by switching the gates by means of a hydro-station.

EFFECT: reduced time for plugging-back operation; elimination of personnel presence in hazardous zone.

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Description

The invention relates to the oil and gas and exploration industries and is intended for the injection of plugging material into the well during emergency operations.

A well-known installation for wellhead and downhole plugging, when used (1, p. 244), the plugging material is first manually loaded into a special cassette, which is then mounted in a pipeline line connected on one side to the emergency (to be plugged) well, and on the other pumping unit, with the help of which the forced filling of plugging material from the cartridge into the well is performed. After the material in the cassette is fed into the well, the section of the pipeline line into which the cassette is integrated is blocked on both sides by valves, the cassette is dismantled and reloaded with the plugging material. Then it is again mounted in the pipeline line for the forced supply of material from the cartridge into the well by the pump unit. This operation during emergency operations can be repeated several times.

The known method has significant disadvantages:

- dismantling the empty cartridge and the subsequent re-assembly of the filled cartridge takes a considerable period of time, during which the previously plugged material can partially or completely be washed away by the flow of fluid leaving the well under pressure;

- during the dismantling of the empty cassette and the subsequent installation of the filled cassette, it is possible that leaks may occur at the joints of the pipeline joints with the cassette with elastic seals, which necessitates additional work to eliminate them;

- for servicing the installation during plugging, the direct participation of two or three people is required provided that they are located directly in the danger zone near the emergency well and the pipeline under high pressure.

The aim of the invention is the creation of a mechanized device for loading plugging material into the pipeline line, connected on the one hand to the emergency well, and on the other to the pump unit, which eliminates manual assembly and disassembly of the cartridge in the danger zone, reduces the time for preparatory operations, reduces the possibility of erosion plugging material pumped into the well during loading of the next batch into the reservoir and, ultimately, will allow the plugging operation to be carried out much faster and at a lower cost, and also eliminates the need for the presence of operational personnel engaged in the installation and dismantling of the cartridge in the danger zone.

This goal is achieved by the fact that in the installation for wellhead and downhole plugging, consisting of a jet pump, a hopper for loading the plugging material, a plugging of plugging material, hydraulic valves, a pressure valve and a hydraulic station, characterized in that it is rigidly connected to the discharge line of the plugging material in a storage well, the internal cavity of which is in communication with the injection cavity of the jet pump housing, loading the plugging material from the hopper can os automatically and continuously due to the reduced pressure arising in the jet pump housing when incorporated in multiple repeated cycles of operation by remote control valves states of hydraulically from the hydraulic control unit.

The design of the installation for wellhead and downhole plugging is shown in figure 1, figure 2 is a diagram of the installation of equipment designed to eliminate the emergency situation on the well using the installation for continuous wellhead and downhole plugging.

The installation (Fig. 1) consists of a jet pump 1, a plugging material plugging device 2, a hopper for loading the plugging material 7, hydraulically controlled valves 8, 9, 10 and 11, a pressure valve 12 and a hydraulic station 13.

The accumulator of plugging material 2 is structurally made in the form of a pipe 3, one end of which is connected to a hydraulically controlled valve 8, and the other to a hydraulically controlled valve 10, and a part of this pipe, in the wall of which numerous holes of small diameter 6 are made, is hermetically enclosed in a clip in the form of a pipe 4 The inner cavity of the cage is connected by a pipe 5 to the cavity of the rarefaction of the jet pump. In addition, the pipe 2 is connected through a hydraulic valve 9 with the hopper 7.

The hydroelectric station 13 is connected by flexible pipelines to the controls of the valves. The pipeline for supplying fluid to the jet pump 1 is connected by a pipe to the pipeline for supplying a hydraulically controlled valve 10 and have a common outlet to the pump unit. The pipe drain fluid from the jet pump is connected in parallel with a pressure valve 12 and a hydraulically controlled valve 11.

Equipment (figure 2), designed to eliminate the emergency situation at the well 14, into which uncontrolled discharge of fluid through the pipe 15 occurs, consists of a clamp 16, a manually controlled valve 17 connected by a pipe 18 to the installation for wellhead and downhole plugging 19, of the unit pump 20 connected by pressure head 21 and drain 22 pipelines with installation 19, manifold 23 with manually controlled valves 24 and 25, connected by pipelines with pump units 26 and 27.

Work on the continuous plugging of an emergency well is as follows.

The first batch of plugging material made of solid materials (aluminum, etc.) having a cross-section (up to ⌀40 mm) is loaded into the hopper 7. With the help of the hydraulic station 13, the valves 8 and 10 are closed, and the valves 9 and 11 are opened, after which the fluid supply from the pumping unit 20 to the jet pump 1 is turned on. Next, the liquid passes through the open valve 11 and returns through the pipeline to the tank of the pumping unit. When the liquid passes through the jet pump in the cavity of its body, a vacuum is created below atmospheric pressure, which is transmitted through the pipe 5 and the hole 6 to the pipe 3 and ensures suction from the hopper 7 through the valve 9 into the accumulator 2 of the plugging material. Upon completion of the transfer of the plugging material from the hopper to the accumulator using the hydraulic station 13, the valves 9 and 11 are closed and the pressure of the fluid supplied from the pumping unit 20 by means of a pressure valve rises to a value 10% higher than the static pressure in the emergency well. The next step is to manually open the valve 17, then using the hydraulic station, the valves 8 and 10 open, while the plugging material, together with the fluid flow from the pumping unit, begins to be fed into the pipe 15 of the emergency well 14 and, together with the fluid of the well, enters the clamped section of the pipe, filling its internal cavity and gradually blocking the passage channel.

After the first batch of plugging material is fed into the pipe 15 by means of a hydraulic station 13, the valves 8 and 10 are closed, and the valve 11 opens, the hopper 7 is filled with the next batch of material having a smaller cross section and made of softer (rubber band, crumb, etc. .) materials. The next step opens the valve 9 and the filling of the pipe 3 of the reservoir 2 is repeated, and then, as before, the plugging material is fed into the well pipe. These operations of filling the plugging material are repeated until the pipe bore is completely blocked and the fluid coming out of the well stops flowing out of the pipe. After the ejection of fluid from the flowing well is stopped, the pumping units 26 and 27 through the open valves 24 and 25 inject the specific gravity solution necessary for the liquidation of the accident into the well.

The use of the invention can significantly improve labor productivity and the safety of personnel engaged in the work to eliminate accidents in wells.

Information sources

1. Equipment and tools for the prevention and elimination of fountains V.R. Radkovsky, D.V. Rymchuk, Yu.E. Lenkevich, O.A. Blokhin. - M .: Nedra, 1966.

Claims (1)

Installation for continuous wellhead and downhole plugging, consisting of a jet pump, a hopper for loading plugging material, a plugging of plugging material, hydraulic valves, a pressure valve and a hydraulic station, characterized in that the drive is rigidly connected to the injection line of the plugging material into the well, the cavity of which has a message with the discharge cavity of the jet pump housing, the plugging material can be loaded from the hopper automatically and without intermittently due to the reduced pressure arising in the housing of the jet pump when it is turned on in multiple repeated cycles by remote control of the states of hydraulically controlled valves from the hydraulic control panel.

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