RU166075U1 - DEVICE FOR WELL OPERATIONS - Google Patents

Abstract

A device for conducting downhole operations, comprising a submersible electric centrifugal pump housing - ESP, which is lowered into the casing of a well on a load-carrying power cable, in which a submersible electric motor is located - a SEM connected to the pump section, as well as downhole measuring sensors controlled by a packer and an anchor, while the housing The ESP is made elongated and equipped with an upper - passive and lower - controlled centralizers, and the packer and anchor are mounted on the ESP body below the PED; the processing unit is located in the elongated case transmission to the surface of the measured parameters, the operation control mechanisms packer anchor and the lower centralizer managed to load-carrying power cable is fixed current-carrying cable connected to the body of the ESP, as between the packer and anchor installed replaceable element ESP housing, which may be of different lengths.

Description

The proposed utility model relates to the field of fluid production from boreholes, namely the use of submersible electric centrifugal pumps for temporary well operations.

A well-known downhole pump installation comprising a submersible pump installed in a well on a pipe string, a submersible pump, an electric power cable passed along the pipe string, connected to the surface to the submersible motor operation control station, and a submersible instrument module with sensors of well condition parameters and a conversion device sensor signals, for example pressure and temperature sensors (RF patent No. 2256065, publ. 10.07.2005).

The well-known downhole pumping unit is designed for industrial exploitation of oil and gas wells and is installed for a long time.

During the operation of wells, various problems arise, leading to a decrease in their productivity. In the event of such situations, these wells are subjected to overhaul - well workover, aimed at eliminating the causes that caused a drop in their productivity (Yu.A. Gutorov, A.Yu. Gutorov. Information control and maintenance of the overhaul of oil and gas wells. Oktyabrsky, UGNTU, 2008 .).

After the well completion in such wells, trial operation is carried out - a temporary downhole operation aimed at putting the well into operation.

It is known to use submersible electric centrifugal pumps for such belt well operations.

A known method of conducting temporary downhole operations using submersible pumps and a system for its implementation, lowered into the well on a cable (US Pat. RF No. 2469182, prior. 27.02.2008, publ. 10.12.2012).

The system according to an embodiment of the invention comprises a main compact submersible electric centrifugal pump, lowered into the well on a cable, for placement above the reservoir. The system control unit is equipped on the surface to control the operation of the system, supply power to it and register the received data.

The main submersible electric centrifugal pump is equipped with a blocking device, such as a packer, which can be opened to create an impermeable barrier between the upper part of the well and its lower part, in which perforation channels are made in the string. A logging tool, such as an inflow profile removal device, is connected to the lower part of the submersible electric centrifugal pump by means of an electrical and mechanical fastening system and is located near perforation channels. Additionally, the system can be equipped with a flow meter located at the outlet of the submersible electric centrifugal pump.

An over packer is preferred as an insulating device. However, in cases where the compact submersible electric centrifugal pump system is lowered through the tubing, it can be equipped with a sealing device that is installed in the proper place inside the tubing.

The known invention provides for the modification of an additional compact submersible electric centrifugal pump, lowered into the tubing on the cable, for use in short-term well operations, namely, when logging and testing wells, when the main submersible electric centrifugal pump (ESP) mounted in the well on the tubing is turned off.

One of the modification options involves the descent of an additional submersible electric centrifugal pump in the tubing on a wireline cable.

The disadvantage of this tool is as follows.

In the known method, compact ESPs are used that are lowered into the tubing on a wireline with an electrical core, without equipping them with centering and sealing devices. Due to their small size, such ESPs do not have enough power for trial operation after overhaul of wells - well workover, when it is necessary to bring the well productivity to a pre-repair level.

Typically, the test operation of wells after the well work-up is carried out by regular deep-well pumping equipment on the tubing, which includes an ESP that has sufficient power to transport fluid from the reservoir to the surface.

The total length of the standard submersible electric centrifugal pumps often reaches 10-15 m, and when lowering such ESPs on the cable, their reliable fixation and centering in the wellbore will be required.

The objective of the proposed utility model is to increase the efficiency of the trial operation of wells after completion of workover by using a standard submersible ESP having sufficient power and being lowered into the casing of the well on a load-carrying power cable without using tubing, which significantly reduces the effort for tripping .

This problem is solved in that in a device for conducting downhole operations, comprising a submersible electric centrifugal pump housing - ESP, which is lowered into the casing of a well on a load-carrying power cable, in which a submersible electric motor - a SEM connected to the pump section, as well as downhole measuring sensors, controlled packer and anchor, the ESP body is elongated and equipped with an upper - passive and lower - controlled centralizers, and the packer and anchor are mounted on the ESP body below the PED, in an elongated body the processing unit for transmitting and measuring the measured parameters to the surface, the mechanisms for controlling the operation of the packer, anchor and lower controlled centralizer are placed, a current-carrying cable connected to the ESP housing is attached to the load-carrying power cable, and a replaceable element of the ESP housing is installed between the packer and the armature, which can be different lengths.

In FIG. 1 shows a schematic diagram of a device.

In FIG. 2 shows a mechanism for controlling the operation of the packer, anchor and lower centralizer in the transport position.

In FIG. 3 shows the mechanism for controlling the operation of the packer, anchor and lower centralizer in action.

The proposed device consists of the following components and parts.

In the casing 1 with a perforation interval 2 opposite the reservoir 3 on the load-carrying power cable 4, an ESP 5 is fixed, to which a current-carrying cable 6 is attached, attached to the load-carrying power cable 4, lowered into the well using a roller 7 at the wellhead and a drum 8 installed on a mobile vehicle 9.

ESP 5 contains an elongated housing 10, which includes a receiving filter 11, a submersible electric motor 12 - a SEM, which drives the pump section located in the compartment 13.

The housing 10 also houses a node 14 for measuring the flow, pressure and moisture content of the fluid passing through the ESP 5, a unit 15 for processing and transmitting the measured parameters to the surface via a current-carrying cable 6, an output filter 16, and nodes of the upper 17 (passive) and lower 18 (controlled) centralizers .

The housing 10 is equipped with a controlled packer 19 (packer) with sliding elastic elements 20 and an armature 21 (anchor) with sliding elements 22. A removable element 23 of the ESP housing 10 is installed between them, which can be of different lengths.

The current-carrying cable 6 provides power to the PED 12 and the processing unit 15 and transmitting the measured parameters to the surface.

The wellhead is equipped with a faceplate 24, on which a flow line 25 with a shut-off valve 26 is mounted.

Managed packer 19, guided anchor 21 and lower guided centralizer 18, in their design contain the same mechanism for controlling their work (Fig. 2 and Fig. 3). The specified mechanism contains a conical rod 27 with a movable housing 28. The conical rod 27 is provided with a coupling thread 29 and a nipple thread 30 for connection with the housing 10 - ESP 5. The movable housing 28 is placed between the conical rod 27 and the hydraulic actuator housing 31 to which the hydraulic tube 32 is connected connected to the pressure output of the pump section located in the compartment 13 of the ESP 5. The hydraulic pipe 32 passes inside the controlled packer 19 and the armature 21 through the replaceable element 23 and is fed to the control mechanism of the lower centralizer 18. The movable housing 28 interacts with a movable cylinder 33 and is equipped with sliding elements 34 with a return spring 35. By sliding elements 34 are meant in each control mechanism for triggering the armature 21 - sliding dies 22, for the lower centralizer 18 - sliding ribs 36, for the packer 19 - sliding elastic elements 20 .

The device operates as follows.

To carry out trial operation of the productive formation 3 after completion of all scheduled cattle operations to decolmate the perforation interval 2, eliminate leaks in the casing 1 and cement ring (not shown in Fig.), On a load-carrying power cable 4 (GOST-R51978-2002), passed through a roller 7 at the wellhead 24 and reeled from the drum 8, the casing 10 of the ESP 5 inside the casing 1 is lowered into the well to the perforation interval 2 opposite the reservoir 3.

During the descent of the ESP 5, the upper passive (uncontrolled) centralizer 17 provides the centered position of the casing 10 of the ESP 5 in the casing 1, and the lower controlled centralizer 18 is in the folded transport position.

After lowering the ESP 5 to the desired depth, by command from the surface, transmitted via the current-carrying cable 6, the pump section is placed in the compartment 13, to the pressure outlet of which a hydraulic tube 32 is connected, through which pressure is supplied to the cylinder cavity 33 of the operation control mechanism packer 19, anchor 21 and centralizer 18. The cylinder 33, moving from the pressure of the liquid upward, pushes the movable housing 28 together with the sliding elements 34, which move along the surface of the cone 27 and extend, occupying the working position.

To ensure a stable position of the ESP body 10 in the well between the packer 19 and the armature 21, a replaceable element 23 is installed that spans the support point of the lower controlled centralizer 18 relative to the support points of the sliding elements of the packer 19 and the armature 21 by the required distance, which ensures rigid fixation of the ESP body 10 casing string 1 at zenith angles of the well from 5 to 30 degrees, and more. The length of the interchangeable element 23 is selected depending on the zenith angle of the wellbore, the larger the zenith angle, the longer the interchangeable element is installed.

After the packer 19, the armature 21 and the lower controlled centralizer 18 are triggered, the PED 12 connected to the pump section in the compartment 13 of the ESP 5 is launched from the surface transmitted through the current-carrying cable 6, and trial operation of the productive formation 3 is started. The formation fluid transported by ESP 5, is fed into the intake filter 11, then through the pump section located in compartment 13, it enters the unit 14 for measuring the flow, pressure and moisture content of the fluid passing through ESP 5, the measured data of which on the flow, pressure and moisture content and after processing in block 15 is transmitted to the surface by power cables 6 for registration in real time in the ground station 9.

After the trial operation mode reaches a stable industrial level, its compliance with the result planned as a result of the cattle is assessed and a decision is made either to re-resume the cattle operations or to start the formation in commercial operation.

When deciding to re-run the cattle, the ESP body 10 is removed from the well with the help of a load-carrying cable 4 and the vehicle’s winch 9, having previously stopped the flow of fluid from the pump section 13 through the tube 32 to the nodes of the control mechanisms of the packer 19, the armature 21 and the lower centralizer 18, which leads the sliding elements: sliding dies 22, sliding ribs 36, sliding elastic elements 20 of these nodes under the action of return springs 35 to the original transport position.

When deciding to start the formation in the mode of commercial operation, the ESP body 10 is removed from the well 1 and, instead of it, the standard deep-well pumping equipment on the tubing is lowered into the well and commercial production is started (not shown in Fig. 1).

Compared with the use of downhole pumping equipment that is lowered onto the tubing for temporary well operations, the use of a powerful full-time submersible ESP that is lowered into the well on a load-carrying power cable will reduce the cost of temporary downhole operations due to the less costly and simpler tripping technology operations of downhole pumping equipment before and after the well completion, as well as before and after the start-up of the well, first in trial and then in commercial operation.

Claims (1)

A device for conducting downhole operations, comprising a submersible electric centrifugal pump housing - ESP, which is lowered into the casing of a well on a load-carrying power cable, in which a submersible electric motor is located - a SEM connected to the pump section, as well as downhole measuring sensors controlled by a packer and an anchor, while the housing The ESP is made elongated and equipped with an upper - passive and lower - controlled centralizers, and the packer and anchor are mounted on the ESP body below the PED, the processing unit is located in the elongated case transmission to the surface of the measured parameters, the operation control mechanisms packer anchor and the lower centralizer managed to load-carrying power cable is fixed current-carrying cable connected to the body of the ESP, as between the packer and anchor installed replaceable element ESP housing, which may be of different lengths.

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