RU2273721C2 - Packer installation device - Google Patents

Abstract

FIELD: oil production industry, particularly devices included in packing equipment and adapted for packer installation in production wells during well repair operations.

SUBSTANCE: method involves lowering hydraulic jack connected to coiled tubing pipe in well, wherein the lower part of hydraulic jack is fastened to bridge plug by collet unlocking mechanism releasable at predetermined depth; leaving the bridge plug in well for necessary repair work performing; removing hydraulic jack connected to coiled tubing pipe from well. The bridge plug may be released from the well when needed by drilling-out thereof.

EFFECT: increased reliability, simplified packer structure, reduced labor inputs and costs of packer installation.

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Description

The invention relates to the oil industry, and in particular to devices that are part of the packer equipment and intended for the installation of packers in production wells during the repair work in them.

A device for connecting and disconnecting a packer with a pipe string [1].

The disadvantage of this device is the leakage of the packer, which can lead to premature disconnection of the pipe string from the packer.

Known hydromechanical device for packing oil and gas wells, consisting of an elastic element, a control device with an engine and a cable for lowering and supplying electrical voltage to the control device [2].

Closest to the proposed device is an electromechanical packer on a cable-rope, consisting of an elastic element, a control device on the cable, an electric motor rigidly connected to the body, and screw pair [3].

The disadvantages of the packing devices [2] and [3] are the complexity of their design and, accordingly, the high cost of manufacturing. The electric motor is rigidly connected to the body and does not allow to disconnect the control unit and leave the packer in the well.

The aim of the present invention is to provide such a device for installing packers, which allows you to leave the packer at the right depth at the right time or permanently and to separate the device itself from it after installation. In the future, the most expensive equipment (coiled tubing and jack) can be used repeatedly, which significantly reduces the cost of the packing process. In addition, process control is simplified by eliminating expensive equipment.

The essence of the claimed technical solution lies in the fact that in the device for installing packers in production wells containing means for delivery and installation of the packer, made using a jack, a hydraulic jack is used as a jack, which is mounted on a coiled tubing designed to be lowered into the well, at the same time, in its lower part, the hydraulic jack is coupled with a collet release mechanism interacting with the packer when applying the necessary pressure at a given depth.

The drawing schematically shows the device of the present invention.

The hydraulic jack for passage through the coiled tubing consists of a valve assembly with a spring 1, a barrel of a jack 2, a cylinder 3, a piston 4, a collet mechanism of a release 5 and a pusher 6.

The device operates as follows: through a coiled tubing pipe 7, the fluid enters the valve assembly 8 and then through the openings 9 and 10 located in the valve 11, enters the subvalve space. Further, from the valve space, the liquid flows through the channels 12 to the outside, and through the channels 13 to the working chamber to the piston 4, cylinder 3, the barrel of the jack 2 and the release mechanism 5, while expelling air at a washing speed of up to 1.5 l / s. Further, the flow rate of the liquid must be increased to at least 2 l / s. The valve 11 under pressure of the liquid lowers down and compresses the spring 1 and closes the channels 12. Through the channels 13 in the working chamber creates pressure transmitted through the barrel 2 to the release mechanism 5. When the pressure increases, the piston 4 with the pusher 6 begin to move down, compressing the packer 14. Upon reaching a pressure of 220 atm, the release mechanism 5 compresses the collet 15, as a result of which the packer and the jack are disconnected. The jack rises on the coiled tubing up, and the packer (packer plug) remains in the well for the required time.

If necessary, the packer plug is released from the well by drilling.

The design of the device allows the use of an emergency trip device that is triggered in emergency situations, designed to disconnect the packer-plug-plug-jack assembly from the coiled tubing, through which the fluid is filled (pressure supply). The flow rate of the working fluid required for packing includes a range from 1.5 to 3.5 l / s, and the pressure in the coiled tubing when installing the packer plug is 220 atm. The coiled tubing is attached to the jack through a check valve, which allows for pressure control in the device. The length of the assembly, including the packer plug, jack, check valve and emergency release device, does not exceed three meters.

The proposed device allows the installation of packer plugs of various sizes for production cores with diameters from 140 to 219 mm.

Information sources

1. A.S. USSR No. 981579, class E 21 B 33/12, 1981.

2. RF patent №2122104, class. E 21 B 33/12, 1998.

3. A.S. USSR No. 2087672, cl. E 21 In 33/12, 1997 (prototype).

Claims (1)

A device for installing packers in production wells, comprising means for delivering and installing a packer made using a jack, characterized in that a hydraulic jack is used as a jack, which is mounted on a coiled tubing designed to be lowered into the well, while in its lower part the hydraulic jack is coupled to a collet release mechanism interacting with the packer when applying the necessary pressure using the above jack at a predetermined depth.