RU2173379C2 - Electrohydromechanical device with remote control for packer setting in oil and gas wells and method of hydrodynamic researches of these wells - Google Patents

Abstract

FIELD: oil producing industry; applicable in research of technical conditions of pipe strings in well repairs. SUBSTANCE: packer flexible member is secured to body from atop, and from below it is fastened to movable coupling-piston with pressure supplied from wellhead, coupling-piston moves upward and compresses flexible member to press it to well walls. There is system of control and recording of pressure variation in flexible member and pressure in well above flexible member and under it. There are limit pressure valve, pressure compensation chamber and system of automatic packer releasing. Flexible member body has longitudinal channels for hydraulic communication of flexible member with pressure compensation chamber and through channel of accommodation of transit line of electrical communication with transducers. Packer setting device is run into well to examine technical conditions of pipe string state and well by monitoring and recording of pressure variation above and under it during building up pressure at wellhead. EFFECT: higher efficiency of examination. 2 cl, 2 dwg

Description

 The invention relates to the oil industry and can be used to conduct hydrodynamic studies of the technical condition of the production casing during the repair of wells.

 A device for packing wells (a.s. N 1828489, E 21 B 33/12, 1986), consisting of a trunk with transverse channels, is known. The disadvantage of this packer is the large metal consumption and the complexity of manufacturing. Also known is a packer (by A.S. N 1502807, 1983). In it, an elastic element and sliding elements interacting with it are installed on a hollow stem with a pipe. The disadvantage of this packer is the need for anchoring.

 The closest is a hydromechanical device for packing oil and gas wells with remote control (US Pat. RF N 2122104). The device is lowered on the cable and can be sealed and unpacked upon command from the surface.

 The disadvantage of this device is the lack of information about the pressure above and below the packer.

 The aim of the invention is to increase the efficiency of hydrodynamic studies of the technical condition of production cores of oil and gas wells during the period of their repair based on the use of an electro-hydromechanical packer with remote control.

 The goal is achieved in that the electro-hydromechanical device for packing oil and gas wells with remote control, consisting of a housing with an elastic element, a shank in which an electric motor with a gearbox and high pressure hydraulic pumps are located, is equipped with: a system for monitoring and recording changes in pressure in the elastic element and pressure in the well above the elastic element and under the elastic element, the pressure limit valve in the hydraulic system of the elastic element, a pressure compensating chamber, and e by an automatic unpacking system, longitudinal channels are made in the case of the elastic element for hydraulic connection of the elastic element with the pressure compensating chamber, providing upward delivery of the piston clutch with the lower end of the elastic element fixed to it, and a through channel is made to accommodate the transit telecommunication line with sensors under elastic element.

 The invention is illustrated by drawings, where Fig.1 is a device in a static state, Fig. 2 - the device is in working condition. The device consists (Fig. 1) of a housing 18 with an elastic element 9 and a shank 15, inside of which there is an electric motor 1 with a gear 2, which is connected to the cam mechanism 3, high pressure hydraulic pumps 4 with valves 5 and pressure sensors 6,13,14 and geophysical cable 16 for lowering the device into the well, supplying electrical voltage and transmitting information from pressure sensors to the surface. The upper part of the elastic element 9 is fixedly mounted, and the lower is fixed on a movable clutch-piston 12, which provides movement upward under the action of pressure in the hydraulic system during the packing process. The body of the elastic element has a through channel 10 for placing a transit line of electrical communication with sensors 14 and 13 located in the shank 15 and monitoring the pressure in the hydraulic system of the packer and the pressure in the well under the packer, respectively. The pressure in the well above the packer is controlled by a sensor 6 above the packer. The device has a pressure compensator 19, which is a chamber filled with oil, and an automatic pressure relief system in the packer hydraulic system, carried out by an electromagnetic valve 7 for unpacking, 8 is a limit valve for relieving excess pressure in the packer hydraulic system. The channel 11 is made in the housing of the elastic element 9 and serves to transmit pressure in the hydraulic system of the packer.

 The device operates as follows.

 The complete assembly is lowered into the well. When the required depth is reached, the cable is supplied with electric voltage to power the electric motor, the power of which is supplied to the gearbox, and from the gearbox to the cam drive of a sinusoidal shape of the hydraulic pumps. Simultaneously with the start of the electric motor, the electromagnetic valve 7. is turned on. It closes the channel for automatic pressure relief in the packer hydraulic system.

 The pressure generated by the hydraulic pumps 4, through the valves 5 through the channels 11 is transmitted under the elastic element 9 and under the clutch-piston 12, providing expansion of the elastic element and pressing it against the walls of the wells (Fig. 2). Simultaneously with the expansion of the elastic element, the clutch-piston moves upward under the action of pressure, ensuring the reliability of packing and preventing the elastic element from breaking.

 Monitoring the pressure in the hydraulic system of the packer is carried out using the sensor 14. The excess pressure in the hydraulic system of the packer is released by the valve 8.

 The pressure in the borehole is controlled by the sensor 6 above the packer, and by the sensor 13 below the packer. Unpacker is unpacked by turning off the power to the device, while the solenoid valve 7 opens the hydraulic channel of the hydraulic system of the packer with pressure compensator 19. In emergency situations (cable break, etc. e.) automatic unpacking occurs.

 The device allows for hydrodynamic studies of the technical condition of wells during their repair. It provides multiple installation and removal of the packer in the required interval and the study of the technical condition of the column and well by monitoring and recording pressure changes above the packer and under it when creating overpressure at the wellhead.

 Closest to the proposed method is the method described in source 4. This method includes packing the well and recording pressure, however, in our opinion, is uninformative.

 We propose a method of hydrodynamic research, including the descent of the packing device on the cable. The method is characterized in that the technical condition of the production casing and the well is studied by monitoring and recording the pressure above and below the packer when creating pressure on the wellhead, using the device proposed in paragraph 1.

 To conduct hydrodynamic studies of wells to study the condition of production casing, the device can be repeatedly sealed and unpacked at any depth from the wellhead to the bottom of the well and when pressure is created at the wellhead using a hydraulic unit from the recorded pressure diagrams above the packer and below the packer, it allows to determine and localize the place of operational failure columns while monitoring the tightness of the packer.

Sources of information
1. A.S. N 1828489, E 21 B 33/12, 1986.

 2. A.S. N 1502807, E 21 B 33/12, 1983.

 3. RF patent N 2122104, from 20.11.1999.

 4. Amirov A.D. and other Overhaul of oil and gas wells.- M .: Nedra 1975, p. 311-312.

Claims (2)

 1. Electro-hydromechanical device with remote control for packing oil and gas wells, consisting of a housing with an elastic element and a liner, in which an electric motor with a reducer, high pressure hydraulic pumps, and a geophysical cable for lowering the device into the well, supplying electrical voltage and transmitting information from sensors to the surface, characterized in that it is equipped with a system for monitoring and recording changes in pressure in the elastic element and pressure in the well above the elastic element with the element and under the elastic element, the pressure limit valve, the pressure compensating chamber, as well as the automatic unpacking system, longitudinal channels are made in the body of the elastic element for hydraulic connection of the elastic element with the pressure compensating chamber, which provides the upward movement of the movable piston clutch with it fixed the lower end of the elastic element, and a through channel is made to accommodate a transit line of electrical communication with measuring sensors located at the bottom of the device ystva.  2. The method of hydrodynamic research of wells, including the descent of the packing device into the well, characterized in that the technical condition of the column and well is studied by monitoring and recording pressure changes above the packer and under it when creating pressure on the wellhead, using the device according to claim 1.

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