RU2622412C1 - Depleted well operation plant - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: depleted well operation plant contains two pumps. One of these pumps is installed on the surface and made with the possibility of using the working fluid from the reservoir pressure maintenance system and delivery of the noted liquid through pump-compressor pipes. The second pump is jet. It is installed in a borehole at the calculated depth and provides for the use of single or double production strings of lifting pipes. Jet pump has a fishneck and a pinned underneath it autonomous geophysical device. This device is designed to monitor the operation of the jet pump and the reservoir characteristics. There is a possibility to lower the geophysical device into the well with the nearing to the reservoir and removal from the well together with the jet pump with the help of a mounting tool and a rope or an rising flow of working fluid. The nozzle device for the jet pump has a channel for sampling reservoir fluid during evacuation by a jet pump, an opening for the outlet of a mixture of working and reservoir fluids, so that they can be lifted along the production string annular space. A non-return valve for separation of the reservoir and working fluid and a packer-anchoring equipment or a sealing device are installed under the jet pump.

EFFECT: increased processibility of well operation.

2 cl, 4 dwg

Description

The invention relates to the oil industry and can be used for the operation of low-yield and marginal wells. The essence of the invention lies in the installation for the production of formation fluid from the reservoir by directly transferring the energy of the injected working fluid to the jet pump, which acts as a transformer that converts the energy of the working fluid into energy for raising the reservoir fluid.

A known method for the extraction of liquid minerals (analogue). RF patent №2199001, ЕВВ 43/00. Published - 02/20/2003 Bull. No. 5.

The method of producing liquid minerals is based on the use of two pumps. One of them is installed on the surface, and the second is jet in the well at a design depth above the packer layout. According to the invention, the suction cavity of a surface mounted pump is connected to a pipe,

 by which the extracted liquid mineral is transported from the jet pump to the surface. The discharge cavity of the pump on the surface is connected to a transport pipe, through which the liquid mineral is supplied to the consumer. There is a container on the transport pipe to which a pipe is connected, supplying liquid to the jet pump through the annulus. The operation of the jet pump is performed by the pressure of the liquid on the surface in the tank on the transport pipe. The cross section of the pipeline is chosen equal to or greater than the cross section of the transport pipe. Liquid is supplied to the transport pipe with high pressure without additional losses, which ensures high performance of both pumps. The performance control of the proposed method in different production conditions is carried out by changing the internal cross-section of the transport pipe with a valve, which allows you to adjust the stable operation of the pumps without pressure pulsation and, therefore, without changing the flow rate, productivity and quality of the produced products.

The disadvantages of the method of extraction of liquid minerals are: the need to fill the entire system with liquid minerals; for stable operation, it is necessary to regulate the cross-section of the pipe, supplying fluid to the jet pump; risks of violating the integrity of the column as a result of injection of the working fluid in the annular space; inability to control bottomhole pressure; To replace the jet pump (revision, nozzle / diffuser replacement), all submersible equipment must be removed from the well.

A well-known complex of equipment for commissioning inactive low-yield oil wells (analogue). RF patent №105665, ЕВВ 43/00 (F04F 5/54). Published on June 20, 2011 Bull. Number 17.

The set of equipment for commissioning inactive low-flowing oil wells includes the installation of a submersible jet pump, wellhead equipment, a block of ground processing equipment, including an oil well fluid preparation unit, a power pump unit, and a monitoring and control system. The block of ground processing equipment is made in a mobile container design.

The installation of a submersible inkjet apparatus is equipped with a telemetry system. Downhole pressure is monitored by a depth gauge. To power the downhole device, as well as to obtain information from it at the mouth, a cable is laid along the tubing.

The equipment complex is equipped with a remote monitoring and control system for the equipment complex and a downhole telemetry system located in the ground mobile unit, which is equipped with lighting, heating systems, including autonomous, ventilation, fire protection and hydrocarbon gas detection, as well as a device for purging process equipment gas.

The disadvantages of the complex of equipment for commissioning inactive low-yield oil wells are: risks of violating the integrity of the production string, cable line as a result of lifting the produced fluid in the annular space; risks of cable damage when lowering the equipment; To replace the jet pump (revision, nozzle / diffuser replacement), all submersible equipment must be removed from the well.

It is known to install a jet pump for operating a well with a sidetrack (analogue). RF patent No. 124307, ЕВВ 43/00 (F04F 5/02). Published 01/20/2013 Bull. No. 2.

The installation consists of a surface power drive, configured to use the working fluid from the reservoir pressure maintenance system. The jet pump is launched on the tubing string, which also serves as a channel for supplying the working fluid from the ground. The rise of the produced fluid is carried out in the annulus. To separate the bottomhole zone of the well and the annulus, a packer is used.

The disadvantages of installing a jet pump for operating a well with a sidetrack are: the risks of violating the integrity of the column as a result of lifting the produced fluid in the annulus; inability to control bottomhole pressure; To replace the jet pump (revision, nozzle / diffuser replacement), all submersible equipment must be removed from the well.

These disadvantages are partially eliminated in another known installation of a jet pump for the operation of wells with a sidetrack of small diameter, adopted as a prototype. RF patent №144129, ЕВВ 43/00, Е21В 47/06). Published 08/10/2014 Bull. Number 22.

The installation can be used for oil production from both directional oil wells and oil wells with sidetracks equipped with a production casing of small diameter. The installation consists of a surface power drive, made with the possibility of using the working fluid from the reservoir pressure maintenance system, the jet pump. The jet pump is launched on the tubing string, which also serves as a channel for supplying the working fluid from the ground. The rise of the produced fluid is carried out in the annulus. To separate the bottomhole zone of the well and the annulus, a packer is used. Downhole pressure is monitored by a depth gauge. To power the downhole device, as well as to obtain information from it at the mouth, a cable is laid along the tubing.

The disadvantages of installing a jet pump for operating a well with a sidetrack with a sidetrack of small diameter are the lack of efficiency of the well’s operation because of the complexity of its maintenance, which requires changing the operating mode of dismantling the well equipment and removing it from the well, the risks of violating the integrity of the column when extracting formation fluid from the well.

The main task to be solved by the claimed invention is aimed at ensuring the efficient operation of low-producing wells using a jet pump and improving the recovery of formation fluid from the wells.

The technical result is to increase the manufacturability of the well.

The specified technical result is achieved by the fact that the known installation of a jet pump for operating wells with a small borehole contains two pumps, one of which is installed on the surface and configured to use working fluid from the reservoir pressure maintenance system, and the second is a jet in the well at the design the depth installed in the tubing string and the depth gauge on the cable, according to the proposed technical solution, the installation includes a tubing string For two implementation schemes, a one- and two-lift design, a jet pump assembly comprising a jet pump, hermetically mounted in a landing device with an opening for the outlet of a mixture of working and reservoir fluids and having a channel for collecting reservoir fluid and a fishing head for gripping with a mounting tool and removing it from the well using a rope or an upward flow of working fluid, and an autonomous geophysical instrument fixed under it, as well as a check valve installed under the jet pump or anchor assembly packer equipment, while the one-lift design contains anchor-packer equipment, the two-lift design contains the design of the tubing string assembled according to the “pipe-in-pipe” scheme, and a sealing device.

The analysis of the prior art cited by the applicant made it possible to establish that there are no analogs characterized by sets of features identical to all the features of the installation for operating low-yield wells. Therefore, the claimed technical solution meets the condition of patentability "novelty."

The search results for known solutions in the art in order to identify features that match the distinctive features of the prototype of the features of the claimed technical solution have shown that they do not follow explicitly from the prior art. From the prior art determined by the applicant, the influence of the transformations provided for by the essential features of the claimed technical solution on the achievement of the specified technical result is not revealed. Known downhole ejector. RF patent No. 2560969, F04F 5/02. Published 08/10/2014 Bull. Number 22. A downhole ejector is installed in a tubing string equipped with a packer, with the option of removing it from the well. This device differs in functionality and is used to increase the efficiency of the downhole pumping equipment, to remove gas from the under-packer zone. Therefore, the claimed technical solution meets the condition of patentability "inventive step".

The claimed technical solution can be implemented at any engineering company from well-known materials using the accepted technology and successfully used in oil wells. Therefore, the claimed technical solution meets the condition of patentability "industrial applicability".

The implementation of the task includes two schemes of installations for the operation of low-production wells.

The first scheme involves the use of two pumps, one of which is installed on the surface and configured to use working fluid from the reservoir pressure maintenance system, and the second is jet in the well at a design depth above the anchor-packer equipment, designed to separate incoming fluid from the reservoir and injected power fluid. The jet pump is lowered together with a stand-alone geophysical instrument to control the operation parameters of the jet pump and the reservoir, directly fixed under it or deepened to the bottom on the bondage. A jet pump is recoverable from a well using cable technology or continuous pipe technology. The power fluid is supplied to the jet pump through tubing 2.5 "and more, and the production is lifted through the annulus of the production string. The disadvantages of this scheme are the risks associated with the violation of the integrity of the string as a result of lifting the produced fluid through the annulus, but which are solved in the second scheme.

The second scheme is the design of the downhole equipment of the packer-less jet pump arrangement with a double-row pipe-in-pipe lift, where the working fluid is supplied to the jet pump through 1.5 "tubing, and the produced products are lifted through 3" tubing. When using 2.5 ”or more tubing for supplying power fluid and raising 3.5” or more tubing for extracted products, the layout design involves the use of a retrievable jet pump with a stand-alone geophysical instrument to control the performance of the jet pump and reservoir. This design allows you to eliminate the negative impact of the raised fluid on the production string and to quickly monitor the mode of formation by measuring static and dynamic levels in the annulus. The application of this scheme is limited by the diameter of the production casing 6 "and more.

The possibility of implementing the method is shown in the accompanying drawings, where in FIG. 1-2 shows the implementation of the method according to the first scheme, FIG. 3-4 - according to the second scheme.

The first scheme (Fig. 1) contains a tubing string 3, a pump 1 on the surface with the possibility of using working fluid from a reservoir pressure maintenance system, a jet pump assembly 5 including a fishing head 11, a jet pump 12 and a geophysical instrument 13 fixed under him (a) or deepened (b) to the bottom on the bondage 14. Separation of the reservoir and the injected power fluid is done by a check valve 6, anchor-packer equipment 8, equipped with a shank in the lower part 9. Solid particles suspended on the head woo anchor-packer equipment is minimized by installing a sludge trap above the anchor-packer equipment 7.

Removing the jet pump for possible revision or replacement is carried out using a special catcher 15 and the use of cable technology 17 through the lubricator 16 installed on the fountain reinforcement 2 (Fig. 2).

Pump 1 is designed for the preparation of high-pressure working fluid from production of production wells in a closed oil recovery system for hydraulic drive and control of a jet well pump. The number of connected wells to the pump 1 may be several from two to four. Pump 1 is located on a technological unit containing a control unit, a three-phase separator, backup electric pumps, hydrocyclones, filter systems, a distribution comb, flow meters, shut-off and control valves, instrumentation, chemical input unit, heating, ventilation, lighting and fire protection system.

Using pump 1, the operating mode of the jet pump, well is controlled. Also, the impact on the reservoir is made by replacing the jet pump, which is removed using a rope or using the same working fluid.

The well operation according to the first scheme is as follows.

The pump 1 is turned on, which delivers the working fluid under certain pressure through the tubing 3. Under the influence of this pressure, the fluid enters the jet pump 12, which, by creating a vacuum, draws in the fluid flow from the reservoir 10 through the passage channel in the anchor-packer equipment 8 and directs the mixed fluid flow from the anchor-packer space into the annulus 4 and then to the surface. This cycle of work is repeated. To prevent the ingress of working fluid and putting the jet pump into operation, a check valve 6 is provided as part of the circuit.

Monitoring the operation of the jet pump and the formation is carried out using the stand-alone geophysical instrument 13 installed under it. To replace or revise the jet pump or remove information from the geophysical instrument, a special catcher 15 and the use of cable technology 17 are used (Fig. 2).

The second scheme (Fig. 3) differs from the first one and contains: special fountain fittings 18, designed to fit a two-lift design of tubing in the "pipe in pipe" type: inner pipe 19 - 1.5 ", 2.5", outer 20 - 3 ", 3.5"; the jet pump assembly 5; a sealing device 22 and a funnel with a check valve 23.

The well operation according to the second scheme is as follows.

The pump 1 is turned on, which delivers the working fluid under a certain pressure through the tubing 19. Under the influence of this pressure, the fluid enters the jet pump 12, which, by creating a vacuum, draws in the fluid flow from the reservoir 10 through the sealing equipment 22 and directs the mixed fluid flow into the annular space 4 between the tubing 19, 20 and further to the surface. This cycle of work is repeated. To prevent the ingress of working fluid and putting the jet pump into operation, a funnel with a check valve 23 is provided as part of the circuit.

Monitoring the operation of the jet pump and the formation is carried out using a stand-alone geophysical device 13 installed under it. To replace or revise the jet pump or remove information from the geophysical device, a special catcher 15 and the use of cable technology 17 are used (Fig. 4).

Using the proposed installation for the operation of low-yield wells in two schemes for its implementation will significantly increase the efficiency of operation of such wells. The proposed technology for producing reservoir fluid meets the requirements of the Rules for the Protection of Subsurface Resources approved by the Decree of the Gosgortekhnadzor of the Russian Federation No. 71 of June 06, 2003.

Claims (2)

1. Installation for the operation of low-production wells, containing two pumps, one of which is installed on the surface and is made with the possibility of using the working fluid from the reservoir pressure maintenance system and delivering the mentioned fluid through tubing to the second — a jet pump, which is installed in the well on calculated depth and involves the use of single-lift or double-lift tubing columns, while the jet pump has a fishing head, an autonomous geophysical device for monitoring the operation of the jet pump and the parameters of the formation with the possibility of its descent into the well with the approach to the formation and removal from the well together with the jet pump using a mounting tool and a rope or an upward flow of working fluid, the landing device for the jet pump has a channel for sampling the formation liquids when creating a discharge with a jet pump, an opening for the exit of a mixture of working and formation fluids with the possibility of their rise in the annulus of the lift Now, under the jet pump, a check valve is installed to separate the reservoir and working fluid and packer-anchor equipment or a sealing device. 2. Installation according to claim 1, characterized in that the single-lift column is additionally equipped with a sludge trap installed above the anchor-packer equipment.

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