RU2379503C1 - Device for oil and gas parametres research in dynamics - Google Patents

Abstract

FIELD: oil-and-gas industry.

SUBSTANCE: geophysical equipment installs under a centrifugal pump, with a help of a drum and a loop, lapped with two-three laps on the drum and has a length commensurable to the research depth. Geophysical equipment and drum's drive connected with supply cables to the centrifugal pump power supply cable, which ensures the geophysical equipment constant operation and undisturbed data transfer to the surface. On the loop side opposite to the equipment fixed counterbalance or the second set of geophysical equipment, allowing to widen geophysical research ability twice. On the equipment and the counterbalance top ends designed end breakers for the drum drive automatic shut down, which corresponding signals to be received on the drum drive control panel, installed on the well head. The equipment move up and down in the research limit during the operation process. The equipment data to be transferred through the power cable to a receiver, installed on the well head.

EFFECT: wells equipped with centrifugal pumps research efficiency increase because of receiving well fluid real dynamic condition information.

2 cl, 1 dwg

Description

The invention relates to the oil and gas industry and can be used in wells equipped with electric centrifugal pumps (ESP), for research in the dynamics of oil or gas parameters by geophysical methods.

A device is known for studying fluid parameters in the process of oil production, including geophysical instruments installed at anchors in the productive intervals of the well under the ESP. Information about the parameters of oil or gas is recorded in the long-term memory of geophysical instruments. The information is read after removing the devices to the surface (see RU 57359, IPC Е21В 47/00, 10/10/2006).

A disadvantage of the known device for studying fluid parameters is that the information arrives at the surface after long periods of time, namely, when the devices are removed after the ESP extracted from the well for repairs.

A device is also known that includes installing geophysical instruments under the ESP and transmitting the received information to the surface through the conductors of a power cable supplying electricity to the ESP (see RU 31259, IPC ЕВВ 47/00, 07/27/2003).

A disadvantage of the known device is that the instruments fix the static state of the fluid at certain points, while the control of processes in the well requires information on the dynamic components of the processes in the well, especially when producing fluid from a multilayer reservoir.

The objective of the invention is to provide a device that provides a study of the real dynamic state of the fluid in the well.

The technical result achieved by using the proposed invention is to increase the efficiency of studies that provide information on the state of the fluid in dynamics at the wellhead.

The specified technical result is achieved by the fact that in the device for studying the parameters of oil or gas, which includes geophysical instruments with elements of their installation in the study interval and a power cable supplying the ESP and transmitting information from the instruments to the receiver installed at the wellhead, according to the invention, as elements of the installation of devices, a drum suspended under an ESP is used, driven into rotation by an electric motor connected by a power cable to the ESP power cable, and wound in two or three turns and a loop on the drum with a length commensurate with the depth of the study interval, while the geophysical instruments are fixed on the loop and connected to the ESP power cable with a supply cable, made in the form of a spring, on the opposite side of the loop from the devices there is a counterweight, the weight of which is equal to the weight of the instruments, on the upper end switches are made at the ends of the instruments and counterload, and a control panel for instruments and a drum motor is installed at the wellhead. As a counterweight, geophysical instruments can be used.

The use of a drum with an electric motor and a loop wound around the drum for installing geophysical instruments in the studied interval allows the instruments mounted on this loop to move along the borehole under the ESP and measure the fluid state in dynamics.

The loop length, approximately equal to the depth of the study interval, allows you to freely conduct research in a given interval.

The fact that the instruments are connected through a power cable to the power cores of the ESP provides, firstly, the continuous operation of geophysical instruments, and secondly, the continuous transmission of information to the surface in real time.

The execution of the cable supplying the devices in the form of a spring is necessary to ensure the possibility of free movement of the devices up and down in the measurement interval.

Securing the counterweight on the side of the loop opposite to the geophysical instruments, with a weight equal to the weight of the instruments, allows, firstly, to balance both branches of the loop for free movement of the instruments by the rotating drum; secondly, to ensure the safety of devices during the descent of the device into the well.

Limit switches, made on top of the instruments and on the counterweight, ensure that the rotation of the drum is turned off when they are successively lifted and abutted into the drum.

Installation of a remote control at the wellhead for controlling the instruments and the drum motor through power cables allows you to control the process of measuring fluid parameters at any given depth and transmit this information to the wellhead in real time.

The use of geophysical instruments as a counterweight allows expanding the capabilities of geophysical research twice.

The proposed device for studying the parameters of the fluid under the ESP is shown in the drawing in the form of a general diagram.

The device contains geophysical instruments 1 installed under an electric centrifugal pump 2, to which power is supplied from the wellhead through the cores of the power cable 3. The elements of the installation in the borehole of the devices 1 are a drum 4 and a loop 5, screwed onto the drum 4 in two or three turns to prevent slipping . The length of the loop 5 is chosen equal to the length of the study interval. An electric motor 6 is installed inside the drum 4. The drum 4 can be suspended under the ESP 2 on the frame 7, which is mounted on the shank 8 of the tubing screwed into the bottom of the ESP 2. The electric motor 6 of the drum 4 is connected to the power cable 3 by the supply cable 9, devices 1 connected to the power cable 3 by a supply cable 10, which is folded in the form of a spring to enable the devices 1 to move up and down. Geophysical instruments 1 are fixed on one side of the loop 5, on the opposite side of which a counterweight 11 is fixed, having a weight equal to the weight of the instruments 1, while a second set of geophysical instruments 1 can be used as the counterweight 11. On top of the instruments 1 and the counterload 11 are made limit switches 12 and 13, respectively. At the wellhead, a remote control (not shown) is installed to control the power supply of the electric motor 6 in the drum 4 and geophysical instruments 1, as well as a receiver (not shown) of the information received from the instruments 1.

The device operates as follows.

Before launching the ESP 2 into the well, it is equipped with pendant equipment: a shank 8 is screwed from below with a frame 7 on which a drum 4 is installed, equipped with a drive electric motor 6. A loop 5 is wound on a drum 4 in 2-3 turns 5. On the opposite branches, loops 5 are fixed in different the ends of the geophysical instruments 1 and the counterweight 11. The power cable 9 to which the electric motor 6 is connected, and the power cable 10 to which the devices 1 are connected, are connected to the cores of the power cable 3 supplying the ESP 2.

The pump 2 with the outboard equipment is lowered into the well, and the power cable 3 is connected to the control panel and to the information receiver installed at the wellhead.

Include ESP in the work. Then, from the control panel on the surface, cables 9 and 10 supply power to the electric motor 6 and devices 1, respectively. The drum comes into rotation, loop 5 begins to rotate and move the instruments 1 down the study interval. In the process of moving down, the devices 1 measure the fluid parameters and transmit information through the supply cable 10 and the power cable 3 at the wellhead in real time. The movement of the devices 1 down stops, limited by the length of the loop 5, equal to the depth of the interval planned for research. At this moment, the counterweight 11 reaches its upper position and the end switch 13 automatically turns off the electric motor 6 of the drum 4. The corresponding signal is transmitted to the control panel mounted on the wellhead, after which the drum 4 is turned on with the reverse direction of rotation. Devices 1 begin to move upward, measuring the parameters of the fluid during the operation of the ESP.

The application of the proposed invention allows the transfer of information about the dynamic state of the fluid to the surface both constantly and periodically, based on production needs.

Claims (2)

1. A device for studying the parameters of oil or gas, including geophysical instruments with elements of their installation in the study interval and a power cable, feeding an electric centrifugal pump and transmitting information from the instruments to a receiver installed at the wellhead, characterized in that the elements used to install the instruments are a drum suspended under an electric centrifugal pump, driven into rotation by an electric motor connected by a power cable to a power cable, and wound in two or three turns on a drum for a length commensurate with the depth of the study interval, while the geophysical instruments are fixed on a loop and connected to the power cable by a supply cable made in the form of a spring, a counterweight is fixed on the side of the loop opposite to the instruments, the weight of which is equal to the weight of the instruments, on the upper ends of the instruments and counterload limit switches are made, and at the wellhead a control panel for instruments and a drum motor is installed. 2. The device according to claim 1, characterized in that geophysical instruments are used as a counterweight.

Images