RU2702180C1 - Unit for simultaneous separate oil production by well with lateral inclined shaft - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil production and can be used for simultaneous separate production of borehole fluid by well with lateral inclined shaft. Proposed plant comprises tubing string arranged in casing, flow regulating and fluid metering unit (FRMU) with adjustment electric drives, two-way submersible electric drive with upper and lower centrifugal pumps, connected by power cable to power supply point through wellhead cable entry, telemetry system unit connected by communication cable with FRMU and instrumentation on control panel of power point for transmission of measurement results by telemetry sensors to control panel and commands in reverse direction, face and support packers, latter is equipped with cross flow clutch (CFC) radial channels of which are interconnected with the upper formation through a lateral inclined shaft, having diameter smaller than the diameter of the well casing, penetrating productive oil-bearing formations, and longitudinal flow channels – with a lower formation through the tail of sampling fluid of the formation fluid, connected to the inner pipe in a lateral inclined-directed barrel, and a split pipe joint. Upper centrifugal pump has inlet module for intake of mixed fluid and comprises additional working sections for increasing oil pressure. Lateral inclined shaft is hermetically installed in casing well bore, for passage of which in wall of casing well bore an aperture is made, and internal pipe – with central channel CFC. Bottomhole packer is made hydraulically and installed in the side inclined-directed shaft between the oil-bearing formations. CFC top is connected with lower part of detachable pipe connection by two-channel branch pipe installed in support packer.

EFFECT: technical result consists in improvement of operating efficiency of recovered oil producing wells due to side inclined barrel and providing reliability of plant operation.

1 cl, 1 dwg

Description

The invention relates to the field of mining, in particular, to oil production and can be used to produce well fluid with a well with a lateral directional shaft.

A device is known for providing communication of a side branch bore with a cased main well bore having a window through which a side branch bore passes, and a connecting element for a side branch passing through a casing window. (Patent RU 2239041 C2. A method for communicating a sidetrack or sidetracks with a cased main wellbore and a device for its implementation, a well completion system having a side branch, a communication method between the main wellbore equipment and the side branch equipment, a device for its implementation. IPC: Е21В 7/08, Е21В 47/12. - October 27, 2004).

A well-known design of the bottom side of the production well, containing a complex of rocks containing the well, consisting of alternating permeable oil-containing and impermeable formations, and a casing pipe normal to their extension in the well. In the range of useful power of the oil-containing formation, a hole and a lateral borehole are made in the casing wall, overlapped by a countersunk of a smaller diameter than the casing, equipped with cementing cuffs, packers and filters. (Patent No. 27147 U1. Design of the bottom hole of the lateral well of a production well. - IPC: Е21В 43/10. - 01/10/2003).

Known pumping unit for oil production from both oil directional wells and oil wells production casing with a small borehole. (Patent No. 131801 U1. Pumping unit for the operation of a well with a sidetrack. - IPC: Е21В 43/12. - 08/27/2013).

A well-known pumping unit for simultaneous and separate operation of a two-layer well, consisting of two blocks of downhole equipment. The first block contains downhole and support packers, equipped with anchor devices with the opposite direction of the anchor rams, connected by tubing. A tubing with a funnel at the end is attached to the bottomhole packer trunk from the bottom. The support packer is equipped with a cross-flow sleeve at the bottom, the radial channels of which communicate with the upper wellbore through the inter-packer space, and a direct-flow coupler with longitudinal flow channels is installed on top of the support packer, on which the inner and outer tubular elements with sockets of the sliding pipe connection are sealed. At the bottom of the direct-flow coupling, in its central hole, a shank is fixed for sampling the formation fluid from the lower reservoir, the free end of which with cuffs is movably located in the central hole of the radial flow coupling, forming coaxial channels communicating with the support packer barrel through the direct-flow coupling with the corresponding channels of tubular elements. The second block contains a tubing string, an electric drive centrifugal pump (ESP) with a frequency-controlled electric drive, a power cable connected to a power point, and a flow control and fluid metering unit (BRPU), equipped with bottom nipple tubular elements for sliding connection with sealing cuffs that form during articulation tubular elements sliding pipe connection with coaxial channels. BRPU contains control valves located in separate channels communicating through windows with an annular annular space, equipped with slide valves with electric actuators and fluid measurement sensors, functionally connected by a communication cable and a cable connector with a control panel passed through the coupling window for inputting a communication cable from annular annular space, with the ability to regulate the flow of reservoir fluids by control valves, and a telemetry system unit s (TMS) for measuring the parameters of reservoir fluids and reservoirs, located between the ESP and BRPU, connected by a communication cable to the control panel. The power cable and communication cable are passed through the cable entry of the wellhead faceplate, followed by sealing, and are connected to the power point and the control panel. The tubing string contains a fitting pipe, which is hermetically connected to the faceplate and secured to the production string flange. (Patent RU 2562641 C2. Method for simultaneous and separate operation of a two-layer well and a downhole pumping unit for its implementation. - IPC: Е21В 43/14. - 09/10/2015). This downhole installation is taken as a prototype.

A disadvantage of the known technical solutions is the low operational reliability of the installation, which reduces the efficiency of the restored oil wells.

The main objective is to increase oil recovery from restored wells due to a lateral directional shaft and to ensure the operability of an oil production unit.

The technical result is an increase in oil recovery from restored wells due to a lateral directional shaft and ensuring the reliability of the oil production unit.

The specified technical result is achieved by the fact that, in a known installation for simultaneous-separate oil production by a well with a lateral directional shaft, containing a vertical casing with a side oblique directional cased hole with a diameter smaller than the diameter of the vertical casing passing through the opening in the casing, in which a column of elevator pipes, a double-sided submersible electric drive with centrifugal pumps, connected by a power cable passed through the cable gland of the of reinforcing valves, with an electric power point equipped with an installation control panel, a flow control and fluid metering unit, containing control electric actuating valves installed in separate channels communicating with the outlets with a receiving chamber, and a cross-flow coupling is connected to the corresponding pipes of the lateral directional borehole from below , telemetry unit of a telemechanical control system connected by a communication cable to a control panel and a unit for regulating flows and metering fluids downhole and supporting packers, the latter is made with a cross-flow coupling, the radial channels of which communicate with the upper wellbore through the interpacker space, and the central channel of the longitudinal flow with the lower layer through the liner connected to the inclined directional inner pipe barrel, according to the proposed technical solution,

the lateral directional bore with the cased part is hermetically installed in the vertical casing of the well and communicates with oil reservoirs, the inner pipe of which is hermetically connected to the central channel of the cross-flow coupling, while the bottomhole packer is installed in the lateral directional barrel between the oil reservoirs, forming an inter-packer cavity and a detachable pipe connection with the lower part is fixed in the support packer and the inner pipe communicates through the central channel of the coupling cross th flow with the inner tube side directional stem, and the outer pipe - through the radial channels mezhpakernoy cavity lateral directional bore communicating with the upper oil-bearing formation;

the upper centrifugal pump contains additional working sections of the sequential increase in oil pressure.

The analysis of the prior art cited by the applicant made it possible to establish that there are no analogues that are characterized by sets of features identical to all the features of the claimed installation of simultaneous-separate oil production by a well with a lateral directional well. 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 solutions on the achievement of the specified technical result is not revealed. Therefore, the claimed technical solution meets the condition of patentability "inventive step".

The claimed installation of simultaneous-separate oil production by a well with a lateral directional well can be effectively used in reconstructed oil producing wells. Therefore, the claimed technical solution meets the condition of patentability "industrial applicability".

In FIG. 1 schematically shows the layout of the proposed installation of simultaneous-separate oil production by a well with a lateral directional shaft.

An installation for simultaneous and separate oil production by a well with a lateral directional wellbore includes a lift pipe string 2 located in a vertical casing 1 of a well, a flow control and fluid metering unit (BRPU) 3 with electric control valves (REC) located in separate BRPU channels, double-sided submersible electric drive 4, which is connected on both sides by drive shafts to the upper 5 and lower 6 centrifugal pumps and connected by a power cable 7 to the power supply point 8, equipped with a panel View 9 of the installation control, a telemetry system unit 10 (TMS) connected by a communication cable 11 to the control unit 3, downhole 12 and support packers 13, the latter equipped with a cross-flow coupling 14 (MPT), the radial channels of which communicate with the upper layer I of the well through the inter-packer cavity 15 in a lateral directional shaft 18 with a diameter smaller than the diameter of the vertical casing 1 of the well penetrating the productive oil-bearing strata I and II, and with longitudinal flow channels - with the lower stratum II through the tail 16 of the reservoir fluid intake, with unified with the inner pipe 17 located in the lateral directional barrel 18, and a detachable pipe connection 19. The upper centrifugal pump 5 is made with an input module 20 for collecting mixed well fluid. The power cable 7 of the electric drive 4 of the centrifugal pumps 5 and 6 is passed through the cable entry of the wellhead faceplate and connected to the power point 8. The upper pump 5 contains additional working sections for successively increasing the oil pressure to lift it to the surface along the column of elevator pipes 2. Lateral directional the barrel 18 is hermetically mounted in the vertical casing 1 of the well, and the inner pipe 17 is hermetically connected to the central channel of the MPT 14, for which, in the wall of the casing 1 of the well, n aperture for the passage of the lateral directional barrel 18. The bottomhole packer 12 is made hydraulic and is installed in the lateral directional barrel 18 between the upper I and lower II oil reservoirs. MPT 14 is connected from above to a two-channel detachable pipe connection 19 by a two-channel pipe 21, hermetically installed in the support packer 13, communicating in separate cavities with separate channels of the BRPU 3, connected by TMS 10, with instrumentation on the control panel 9 at the power point 8 for transmitting the measurement results by telemetry sensors to the control panel 9 and control commands in the opposite direction to the submersible electric drive 4 and REC BRPU 3. A separate channel BRPU 3 communicating with the upper oil with the formation layer I, at the outlet it communicates with the receiving chamber 22, and from below the MPT 14 is connected to the corresponding pipes of the lateral directional well 18.

Installation of simultaneous-separate oil production by a well with a lateral directional shaft works as follows.

From the power supply point 8 through the power cable 7 through the wellhead, the power supply of the TMS 10 is turned on, and the pressure and moisture content of the oil-bearing formations I and II coming from the TMS 10 through the power cable 7 by dividing the signal frequency are checked on the control panel 9 of the well. When the parameters of the formation fluids are within the required limits, on the command from the well control panel 9, a double-sided submersible electric drive 4 is connected, which rotates the upper 5 and lower 6 centrifugal pumps by rotating the double-sided drive shafts. In BRPU 3, the RECs and formation fluid from the oil reservoir I are alternately opened through the interpacker cavity 15, the MPT radial channels 14, one of the channels of the two-channel pipe 21, and the open separate BRPU 3 channel with the REC, washing the sensors for monitoring the parameters of the extracted reservoir fluid under its own pressure enters the lower centrifugal pump 6, by which the reservoir fluid is supplied to the receiving chamber 22, and / or from the oil reservoir II through the shank 16 through the inner pipe 17, the longitudinal flow channel MPT 14, another channel of the pipe 21, and second a separate channel BRPU 3 with REK, washing the sensors for monitoring the parameters of the extracted reservoir fluid, the latter also flows under its own pressure into the receiving chamber 22, in which the fluids from the reservoirs I and II are mixed together. Washing the TMS 10 with its own flow and cooling the double-sided submersible electric drive 4, the mixed formation fluid through the lateral channels enters the input module 20 of the upper centrifugal pump 5, the latter lifts it through sections of the elevator pipe 2 to the surface of the well by sections of successive increase in the pressure of the borehole fluid.

Using the proposed installation for simultaneous and separate oil production by a well with a side inclined directional well will increase the flow rate and the quality of the recoverable oil.

Claims (2)

1. Installation of simultaneous-separate oil production by a well with a lateral directional casing, containing a vertical casing with a lateral directional casing, with a diameter smaller than the diameter of the vertical casing, passing through an opening in the casing, in which the tubing string is placed, double-sided submersible electric drive with centrifugal pumps connected by a power cable passed through the cable entry of the wellhead faceplate to the power point equipped with a control panel control unit, a flow control and fluid metering unit, comprising electric control valves installed in separate channels communicating with the outlets to the receiving chamber, and from below the cross-flow coupling is connected to the corresponding pipes of the lateral directional borehole, the telemetry unit of the telemechanical control system is connected by a cable communication with the control panel and flow control and fluid metering unit in communication with a two-channel detachable pipe connection and supporting packers, the latter made with a cross-flow coupling, the radial channels of which communicate with the upper wellbore through the interpacker space, and the central channel of the longitudinal flow - with the lower reservoir through the liner connected to the inner pipe of the directional shaft, characterized in that the side is inclined - the directional barrel with the cased part is hermetically installed in the vertical casing of the well and communicates with oil reservoirs, the inner pipe of which is hermetically connected to the cent cross channel coupling, while the bottomhole packer is installed in a lateral directional trunk between the oil reservoirs, forming an interpacker cavity, and a detachable pipe connection with the lower part is fixed in the support packer and the inner pipe communicates through the central channel of the cross flow coupling with the inner pipe of the lateral oblique -directional barrel, and the outer pipe through radial channels with an interpacker cavity of the lateral directional trunk, communicating with the upper oil by the reservoir. 2. Installation according to claim 1, characterized in that the upper centrifugal pump contains additional working sections for increasing oil pressure.

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