RU2552555C1 - Method of simultaneous separate or successive production of reservoir fluid from well of multipay fields with preliminary installation of packers - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method includes separate run and installation in well of the pipe string with packer system for two production reservoirs comprising packers, between packers pipe, perforated branch pipe and polished insert. At that top packer has directing funnel and maximum possible diameter of the through channel sufficient for pipes and devices assembly passage. Separate run of pipes string equipped with electric submerged pump, tail, bottom secured pump equipment, or remote control unit, or tight or untight casing of the electric drive presented by string of pipes or rods, on which as least one packer separated reservoir liquid flows, controlled electrical or electromechanical valves regulating or disconnecting fluid supply from the reservoirs to the well, units of sensors monitoring work parameters of the reservoirs, sensors are located within the perforation depth of each production reservoir or above perforation depth of each production reservoir. At that pressure and temperature sensors are located under solenoid or electromechanical valves, thus ensuring regulation of the bottom hole pressure and control of the reservoir pressure and temperature. Humidimeters and flowmeters are located above the solenoid or electromechanical valves or under the solenoid or electromechanical valves. Control of the solenoid or electromechanical valves and information exchange with units of sensors of work parameters of the reservoirs are performed over the both separate electric line having at least one core, or as forth core of submersed power cable of the electric pumps, or via separate electric line instead of the forth core of the submerged power cable of the electric pumps, or from "zero point" of the electric submerged pump, or from the remote control system of the electric submerged pump. If electric line is routed over casing of the submerged motor can or can not be used the insert out of electric line with small diameter closed against mechanical damages by the protective enclosure or by protectors, or can be closed or unclosed against mechanical damages by the enclosure installed similarly to the cooling enclosure of the electric-centrifugal pump. The tail can be equipped or unequipped with emergency disconnector with shear elements designed for definite load, with stroke compensator of thermobaric changes of length of pipes string. Based on the data provided by sensors the optimal modes of simultaneous separate or successive operation of the productive well reservoirs are determined. Determination of the optimal operation modes of the reservoirs and their further updating are performed by operation of valve units that control operation of the reservoirs under automatic or manual modes, automatic system of operation control of the well system ensures remote on-line monitoring of the field development system and to make corrections to operation modes of the well reservoirs.

EFFECT: improved efficiency of well control upon simultaneous and separate operation.

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Description

The invention relates to the field of hydrocarbon production, namely to borehole pumping units for simultaneous-separate or alternate operation of several productive formations and interlayers of wells of multilayer fields, as well as for the management of “intelligent wells”.

There is a method of simultaneous-separate oil production from the layers of one well with a submersible pumping unit (analog) [1] (RF Patent No. 2344274, ЕВВ 43/14. Date of application: 04/16/2007. Published on 01/20/2009), which includes a descent into the well concentrically of two - external and internal - pipe columns, a packer located between the two layers, and two artificial elevators, the lower of which, for extracting fluid from the lower layer, is lowered on the external pipe string and made electric submersible, consisting mainly of a pump with input module and submersible motor atelier with a power cable, characterized in that they select a lower electric submersible pump with operating parameters in accordance with the flow rate of the lower formation, lower it into the well below the packer with a cable entry and place it at a depth above, below or at the level of the lower formation for producing fluid from it an annular space formed between two pipe columns, and above the electric submersible pump, a cross-flow device is installed, made with eccentric channels for raising the lower formation fluid and the cross channel ohm with an axial outlet for the inflow of the upper formation fluid, the upper artificial lift with operating parameters is selected in accordance with the flow rate of the upper formation, and it is lowered separately into the external pipe string above the cross flow device on the internal pipe string and placed at a depth higher, lower, or at a level the upper formation to extract fluid from it through the inner pipe string, in turn, the upper artificial lift is equipped with either a sealing casing with a cable entry or a liner, each of which has a lower a sealing hollow rod placed hermetically in the axial outlet of the cross channel for separating the fluid flows of the lower and upper reservoirs, the electric submersible pump and the upper artificial elevator being launched simultaneously or sequentially or periodically for separate production of fluid from the reservoirs through different pipe columns with the possibility of further accounting for their flow rates on the surface of the well.

The disadvantages of this method are the inability to carry out preventive maintenance and repair of pumping equipment without removing the packer equipment, the impossibility of descending into small diameter columns using submersible electric motors of the required power, the lack of monitoring of the parameters of the formation and controlling the flow of fluid based on the data obtained.

Known intelligent downhole valve system (analog) for controlling the extraction of fluids from several intervals of the well and a method for controlling such extraction of fluids [2] (RF Patent No. 2320850, ЕВВ 43/14 (43), Date of application publication: 2005.09.20. (45) Published 2008.03.27).

The system comprises a pipe string connecting the wellbore to the surface of the earth, installed in a casing string intersecting several productive formations or interlayers, perforated in the intersection zones. On the pipe string at different levels are located drive slide valves and tubular elements of different diameters. Each actuating locking device comprises a tubular housing provided with radial openings, concentrically mounted in it and provided with ring-shaped sealing elements, a slide valve and a hydraulic or pneumatic actuator of volumetric action, which is connected by a tubular control line to a ground control and pressure control unit. The lower end of each tubular element is connected to a packer located above or below the perforated section of the casing. Each packer is equipped with a tubular body and a sealing element concentrically mounted on it. By means of drive slide valves and formed by the corresponding tubular annular cavities located in each other, each producing formation (interlayers) is separately communicated with a common pipe string. At the same time, the system is controlled and monitored by means of drive slide valves and reduces to switching and monitoring the operation of the corresponding pressure monitoring and control units associated with them.

The disadvantages of the known intellectual downhole valve system are the design complexity and limited scope due to inadequacy for use in more productive wells and removing the downhole pump along with a packer system for prevention and repair. In addition, this system does not allow to solve the technical problem of launching a multi-packer arrangement of great length and weight on pumping equipment while limiting the carrying capacity of the pumping equipment. A known method (analogue) of the simultaneous and separate operation of multilayer wells [3] (RF Patent 2313659, ЕВВ 43/14, bulletin 36 dated 12/27/07), including the descent into the well of at least one pipe string equipped between the layers a packer and a regulating device for controlling fluid flow rate during production, while in the well at the level of its formation, a pipe string is equipped with a regulating device with a measuring transducer for transmitting information on measurements to the surface of the well and determining the technological parameters of the fluid during production e, for which a cable is lowered into the well outside or inside the pipe string and connected to a measuring transducer or regulating device or both to a measuring transducer and to a regulating device, and after installation of the wellhead, a fluid is produced by directing it through the regulating device and measuring transducer, receive measurement information from the measuring transducer at the mouth and determine the technological parameters of the fluid for the formations, and if they differ from the design value, the flow rate is changed a certain section of the control device until the design value of the technological parameters for each of the layers is reached. In this case, one of the options for the control device is in the form of an electric or electromagnetic valve with a shut-off element, and the degree of its opening is controlled from the surface of the well by supplying a signal through a cable. To implement this method using a pump, a circuit with a casing is proposed, in the internal cavity of which a fluid flow from at least one formation is directed through a regulating device.

The disadvantages of this layout are the limited scope of the method due to the increase in the diameter of the layout due to the casing and the impossibility of descending into columns of small diameter when using submersible electric motors of the required power, the inability to carry out preventive maintenance and repair of pumping equipment without removing the packer equipment.

Known downhole equipment for simultaneous and separate oil production from two reservoirs (prototype) [4] (RF patent 109792 RU U1 ЕВВ 43/14, filing date June 29, 2011, published October 27, 2011), disconnected in the wellbore by a packer, the tip of which tightly connected to the suction pipe of the pump unit, including an electric centrifugal and sucker-rod plunger pumps, characterized in that the intake of the plunger sucker-rod pump is equipped with a pipe shank, which through a bypass pipe parallel to the electric centrifugal pump y and its engine, the suction pipe of the pumping unit, the head and the packer barrel are hydraulically connected to the lower layer, and the electric centrifugal pump is in the fluid stream coming from the upper layer. After the pumps, the liquid under pressure is mixed and transported to the wellhead through a string of pipes on which the pump unit is lowered into the well. Installation layout is simplified, as separately, a mechanical packer is lowered and installed, then an ESP is lowered to a predetermined depth, and then SHGN on a rod string. If one of the pumps fails, they are removed without a packer. Revision of SHGN is carried out without raising the ESP. Control of the operation parameters of objects is carried out when one pump unit is stopped.

The disadvantages of this equipment are the use of two pumps, stopping the pumps to control parameters, the lack of sensors for monitoring the operation of reservoirs, flow control valves for formation fluid and the impossibility of lowering into small diameter columns.

An object of the invention is to provide a method that allows to increase the efficiency of the technology for producing reservoir fluid from wells of multilayer fields by electric centrifugal pumps or other pumping equipment, to monitor the operation of the strata, to regulate the flow rate of each stratum, if necessary, to turn off the strata in sequence or at the same time, to lift pumping equipment for repair without removing the packer system.

The technical problem is solved by a method that includes a separate descent and installation of a pipe string into the well with a packer system for two productive formations, consisting of packers for separation of objects, an interpacker pipe, a perforated pipe for fluid intake from the upper layer, and a polished sleeve designed to be installed in it with sealing elements installed by the second descent and disconnecting the upper layer from the overlying zone of the production string, in which the production of the layers is mixed, Therefore, the upper packer has a guiding funnel and the maximum possible diameter of the passage channel, sufficient for the arrangement of pipes and devices through it. Separate descent of a pipe string equipped with a borehole pump, electric submersible or of another type, a shank fixed in the lower part of the pumping equipment, or a telemetry unit, or a sealed or leaky casing of the electric drive, represented by a pipe string or rods, on which at least one packer separating the flows is located formation fluids, controlled by electric or electromechanical valves, regulating or cutting off the flow of fluid from the formations into the well, parameter monitoring sensor blocks reservoir operations, which are placed in the perforation interval of each reservoir or above the perforation interval of each reservoir, and the pressure and temperature sensors are placed under electromagnetic or electromechanical valves, which makes it possible to control the bottomhole pressure and control the reservoir pressure and temperature, moisture sensors and flow meters are located above electromagnetic or electromechanical valves or pressure sensors, temperatures, flow meters, moisture meters have electromagnetic or electromechanical valves. Control of electromagnetic or electromechanical valves and information exchange with the blocks of sensors for monitoring formation parameters is carried out either through a separate electrical line having at least one core, either as part of the fourth core of the submersible power cable for electric pumps, or through a separate electrical line (for example, a geophysical multicore cable) instead of the fourth core of the submersible power cable of the electric pumps, either from the “zero point” of the electric submersible motor, or from the telemetric immersion system th motor. When passing an electric line through the body of a submersible electric motor, an insert from a small diameter electric line may or may not be used (the diameter depends on the diameter of the production string for confident passage of the submersible electric motor), closed from mechanical damage by a protective casing or protective protectors, or it may be closed, and may not be closed from mechanical damage by a casing installed similarly to the cooling casing of an electric centrifugal pump. In addition, the shank may or may not be equipped with an emergency disconnecting device with shear elements designed for a specific load, the shank may or may not be equipped with a compensator for the course of thermobaric changes in the length of the pipe string. In FIG. 1 shows a diagram of a separately descent two-packer arrangement for two productive formations 22 and 23, consisting of packers 1 and 2 for separation of objects, interpacker pipe 3, perforated nozzle 4 for fluid intake from the upper reservoir and polished sleeve 5, intended for installation of the nozzle into it 10 with sealing elements of FIG. 2, 3, 4, installed by the second descent and disconnecting the upper layer from the overlying zone of the production string, in which the production of the layers is mixed.

In FIG. 2, 3, 4 shows a diagram of a separate descent of a well pump 12 on a pipe string 19 of an electric submersible or other type with a shank 9, on which there are blocks of sensors for monitoring the parameters of the formation 6, controlled by electric or electromechanical valves 7, which regulate or cut off the flow of fluid from the reservoir into well, a packer 8, separating the fluid flows of the formations, a perforated nozzle 11 for the fluid to exit from both formations into the over-packer zone of the well and at the pump intake, electrical line 14 between the sensor blocks to According to the parameters of the formation 6, the electric line 13, mounted on the pipes with fastening belts 15 and protected on the couplings by protectors 16. When the electric line 13 passes through the housing of the submersible electric motor of the pump 12, the insert 17 from the small diameter electric line is closed or closed from mechanical damage a special protective casing 18 or protective protectors, or cover from mechanical damage with a casing 24, installed similarly to the cooling casing of an electric centrifugal pump (fi . four). In addition, the shank can be equipped with an emergency disconnecting device 20 with shear elements designed for a certain load and is not equipped, the shank can be equipped with a compensator for the course of thermobaric changes in the length of the pipe string 21 and is not equipped.

In FIG. 1-4 depict various ways of arranging layout elements that explain the solution to the technical problem and the description of the method.

Initially, a round-trip operation is performed, including the descent of a pipe string equipped with at least one packer 1 (Fig. 1. 2, 3, 4) to separate objects 22, 23. The upper packer 2 has a polished sleeve 5 and the maximum possible diameter passage channel, sufficient for passing through it the layout of pipes and devices. During the second round-trip operation, the pipe string is lowered with the packer 8 sealed, equipped with a borehole pump 12 (Fig. 2, 3, 4), an electric submersible or another type, a shank 9 (Fig. 2, 3, 4), represented by a pipe string either rods fixed at the bottom of the pumping equipment, or a telemetry unit located under the pumping unit, or a sealed or leaky casing of the electric drive. The shank 9 may be equipped with an emergency disconnecting device 20 with shear elements designed for a certain load, or it may not be equipped, the shank 9 may be equipped with a compensator for the course of thermobaric changes in the length of the pipe string 21, and may not be equipped. On the pipe string 19 from the wellhead to the pumping equipment 12 and to the liner 9 lay an electric line (or several electric lines) 13 (Fig. 2, 3, 4), fixed to the pipes with fixing belts 15 (Fig. 2, 3, 4) or other fasteners, protected on the couplings by protectors 16, providing data transmission from sensors for monitoring the parameters of the formation 6 and powering controlled electric or electromechanical valves 7, which regulate or cut off the flow of fluid from the layers into the well to the ground monitoring station the operation of the layers 25 and the control of the valve blocks, as well as, if necessary, the electric power supply of the pumping equipment 12. When the cable 13 passes through the housing of the submersible electric motor of the pump 12, insert 17 (Fig. 2, 3, 4) from the small diameter electric line is used or not closed from mechanical damage by a special protective casing 18 (Fig. 2, 3), or closed from mechanical damage by a casing 24 installed similarly to the cooling casing of an electric centrifugal pump (Fig. four). In addition, the power of the controlled electric or electromechanical valves 7 and the sensors for controlling the parameters of the formation 6 can be carried out through the telemetry unit of the well pump 12. The bottom of the shank 9 is equipped with at least one packer 8, separating the fluid flows of the layers, a pipe 10 with sealing elements of FIG. 2, 3, 4, installed in the polished sleeve 5 and disconnecting the upper layer from the overlying zone of the production string, in which the production of the layers is mixed with at least one block of sensors for monitoring the parameters of the formation 6, at least one electromagnetically or electromechanically controlled electric valve with a locking element 7, at least one electrical communication and power line 14, which connects the sensors for monitoring the operation of the layers 6 and controlled electrical or electromechanical to 7 valves and through which an electrical connection is established between the ground station for monitoring the parameters of the formation and control valve blocks 25 - as a result, it becomes possible to monitor and evaluate the parameters of the operation of the layers from the respective sensors: pressure, temperature, flow meter, moisture meter in real time and regulation or shutdown formation fluid flow into the well. Pressure and temperature sensors 6 are located under electromagnetic or electromechanical valves 7, which makes it possible to control bottom-hole pressure and control reservoir pressure and temperature, moisture sensors and flow meters 6 are located above electromagnetic or electromechanical valves 7 or pressure, temperature, flow meters, moisture meters 6 are located under electromagnetic or electromechanical valves 7. In wells operating two or more formations, the packer arrangement can be equipped with and electrical or electromechanical valves 7 and an additional bypass insulated from the upper reservoir hydraulic channel (FIG. 2). They can be located in one block under the upper packer 2 (Fig. 2), while one valve is hydraulically connected to the upper layer, and the other controlled electric valve is hydraulically connected to the lower layer. In another case, the controlled electric or electromechanical valves 7 (Fig. 3, Fig. 4) can be located separately and so that each controlled electric valve has a hydraulic connection with the corresponding reservoir being operated. The degree of opening of controlled electric or electromechanical valves 7 is controlled by fluid flows, and, accordingly, bottomhole pressure from at least one operating formation 22, 23 (Fig. 1, 2, 3, 4) passing through valves 7 (Fig. 2 , 3, 4) to the upstream pumping equipment 12 (Figs. 2, 3, 4), while providing the possibility of both controlling and cutting off the fluid flow for the lower 22 or for the upper 23 formation or simultaneously for the lower 22 and upper 23 layers .

Based on the data obtained from the sensors, the optimal modes of simultaneous-separate or alternate operation of the productive layers of the well are determined. The establishment of optimal modes of formation operation and their subsequent adjustment is carried out by the action of valve block control units for automatic or manual operation.

An automated system for monitoring the operation of the well system allows remote online monitoring of the field development system and makes adjustments to the operating regimes of the well formations.

Technological and technical results when using the borehole system are achieved due to the possibility of pre-installation of packers, which allows the lifting of pumping equipment and controlled electric or electromechanical valves, sensor units for monitoring parameters of the formation for repair without removing the packer system. In addition, this system allows you to solve the technical problem of launching a multi-packer layout of great length and weight while limiting the bearing capacity of pumping equipment, as well as in wells with a large curvature of the production string.

The economic effect of the use of the invention can be achieved by controlling the flow rate, simultaneous and separate production, increasing the time between failures, simplifying installation, accelerating the preventive and repair work of pumping equipment.

References

1. RF patent No. 2344274, ЕВВ 43/14. Date of application: 04/16/2007. Published on January 20, 2009.

2. RF patent No. 2320850, ЕВВ 43/14. Date of publication of the application: 2005.09.20. Posted on 2008.03.27.

3. RF patent 2313659, ЕВВ 43/14, bulletin 36 dated 12.27.07.

4. RF patent 109792 RU U1, ЕВВ 43/14. Application submission date 06/29/2011. Published on October 27th, 2011.

Claims (1)

The method of simultaneous-separate or sequential production of formation fluid from wells of multilayer fields with the preliminary installation of packers. comprising a separate run and installation of a pipe string into the well with a packer system for two productive formations, consisting of packers for separation of objects, an interpacker pipe, a perforated nozzle for fluid intake from the upper layer and a polished sleeve designed to install a nozzle with sealing elements installed in it the second descent and separating the upper layer from the overlying zone of the production string, in which the production of the layers is mixed, the upper packer having a guide a funnel and the maximum possible diameter of the passage channel, sufficient for passing through the arrangement of pipes and devices, a separate descent of the pipe string equipped with an electric submersible borehole pump, a shank fixed to the bottom of the pumping equipment, or a telemetry unit, or a tight or leaky casing of the electric drive, represented by a column pipes or rods on which at least one packer is located, separating the fluid flows of the formations, controlled by an electric or electromechanical valve that regulate or cut off the flow of fluid from the formations into the well, the blocks of sensors for monitoring the parameters of the formations that are placed in the perforation interval of each reservoir or above the perforation interval of each reservoir, pressure and temperature sensors are located under electromagnetic or electromechanical valves, which makes it possible to regulate bottom-hole pressure and control reservoir pressure and temperature, moisture sensors and flow meters are placed above electromagnetic and whether electromechanical valves or pressure, temperature, flow meters, moisture meters are placed under electromagnetic or electromechanical valves, the control of electromagnetic or electromechanical valves and information exchange with the blocks of sensors for controlling the parameters of formation work are carried out either via a separate electric line with at least one core, or as a part the fourth core of a submersible power cable for electric pumps, or on a separate electrical line (for example, a multicore geophysical cable) instead of the fourth core of the submersible power cable for electric pumps, either from the “zero point” of the electric submersible motor, or from the telemetric system of the submersible electric motor, and when passing the electric line through the body of the submersible electric motor, it may or may not be used an inset from a small diameter electric line closed from mechanical damage by a protective casing, or protective protectors, or may be closed, or may not be closed from mechanical damage by a casing, similar to the casing of the cooling of an electric centrifugal pump, in addition, the liner may or may not be equipped with an emergency disconnecting device with shear elements designed for a certain load, the liner may or may not be equipped with a compensator for the course of thermobaric changes in the length of the pipe string, This degree of opening of controlled electric or electromechanical valves regulates fluid flows and, consequently, bottom-hole pressure from at least one operation the formation to be passed through the valves to the upstream pumping equipment, while ensuring the possibility of both controlling and cutting off the fluid flow for the lower or upper formation or simultaneously for the lower and upper reservoirs, based on the data received from the sensors, the optimal modes of simultaneous-separate or alternate exploitation of productive strata of the well, the establishment of optimal modes of exploitation of the strata and their subsequent correction are carried out by s valves control the operation of reservoirs in automatic or manual mode, automatic control system works well system allows for remote online monitoring of field development system and make adjustments to the modes of operation of the well layers.

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