RU2440488C2 - Method of simultaneous separate operation of multiple-zone wells and device for its implementation - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: pipe string equipped with packer and control device is lowered to the well. Pipe string or control device is equipped with measuring converter at the formation level. The well is equipped with intelligent control system of production of hydrocarbons and maintenance of formation pressure (ICS). ICS is located at formation level immediately at the measuring converter or control device. Information on measurement of parameters is supplied to ICS through communication interface with measuring converter, where preliminary processing of input information is performed. Analysis of the supplied information is performed in compliance with programme algorithm. Control signal is shaped for the control device in compliance with the specified opening or closing rate of control device. At that, reception and transmission of control data is performed. Simultaneous separate well operation device includes measuring device, control device and ICS. ICS includes analysis and logic unit, communication interfaces with measuring converter and with control device. At that, ICS is installed on the formation level immediately at measuring converter or control device and electrically related to them.

EFFECT: improving response accuracy of actuators, enlarging functional capabilities of the device, increasing efficiency of the operating technology and reducing time costs.

8 cl, 2 dwg

Description

The invention relates to the field of mining from multilayer wells (oil, gas, gas condensate, bitumen, mineral water), maintaining reservoir pressure in multilayer fields and can be used for simultaneous-separate (WEM) or alternate (PE) operation of several producers (WDM) or PD) and / or injection (ORZ or PZ) formations in one well, and also, in some cases, can be used to regulate, study and cut off the fluid inflow from the formations in a fountain, gas lift, pump or injection well.

There is a method for simultaneous-separate and alternate operation of several layers in one well (RF Patent No. 22253009, ЕВВ 43/14. The method includes lowering at least one pipe string with a constant or variable diameter with an open or plugged end, with one or several packers of hydraulic and / or mechanical action without or with a column disconnector, and if there are several packers, they are lowered into the well simultaneously or sequentially (separately) and installed above and / or between the layers, when at least one packer is lowered below and / or above the packers in the form of a borehole chamber or a nipple with a removable valve (regulating device) for supplying a working agent (medium) through them and controlling the flow rate when pumping into formations, then the working pump agent from the mouth into the cavity of the pipe string at a given pressure, directing it into the strata through appropriate removable valves (control devices) in the landing units, and then measure the total consumption of the working agent (at the mouth or inside the pipe string) and the costs of the department nym layers, in particular by a flowmeter reentry into the pipe string above and between the layers (removable valves).

The known method does not allow to control various conditions (in particular, the degree of opening regulation) of removable valves (control devices), to measure, determine and regulate the flow rate of the working agent (medium) or fluid flow rate for each of the layers of one well without a communication channel with a ground-based device ( cable).

The closest technical solution, according to a combination of matching features and the achieved technical result, taken as a prototype, is a method for simultaneous and separate operation of multilayer wells, RF patent No. 2313659, IPC ЕВВ 43/14. The method of simultaneous and separate operation of multilayer wells includes the descent into the well of at least one pipe string with a constant or variable diameter and an open or muffled lower end equipped, between the strata or higher and between the strata, with one or more packers for separating the strata and regulating a device for controlling the flow of the working agent during injection or fluid flow during production, while in the injection, or flow, or gas lift, or pump wells at the level of its formation a pipe or control device with a measuring device for transmitting information on measurements to the surface of the well and determining the technological parameters of the working agent during injection or fluid during production, for which a cable or impulse pipe is lowered into the well outside or inside the pipe string and connected to the measuring device and (or ) with a control device, pump a working agent or produce fluid, directing it through a control device and a measuring device, receive measurement information from the mouth from KSR Control device and determine the technological parameters of the working agent or fluid for recovery, and if they differ from the design value changing an opening area, a regulating device to obtain the design values of process parameters for each of the layers.

The disadvantage of this method is that the information on the measurements obtained in one place (at the level of the wellbore). Transfer it via cable or impulse tube to another (to the surface of the well). On the surface, the information is analyzed, determining the technological parameters of the working agent, then again through the cable (communication channel with the ground device) or the impulse tube, already in the opposite direction, control signals are transmitted to change the throughput section of the control device until the design value of the technological parameters is reached. In this case, as a rule, use a cable of considerable length (from 1 to 5 km).

The transmission of information and control signals at such a distance increases the risk of incorrect transmission of information, therefore, the error and inaccuracy of the response of actuators to changing reservoir indicators increases. In addition, the presence of the human factor when making a decision (untimely or inaccurate action by the operator) can also lead to a deterioration in the total production rate.

Another disadvantage of this method is the technological features of the descent operations - cable lifting, the need for which arises in connection with the solution of problems associated with the replacement of pumping equipment, power cable that feeds the installation of an electric centrifugal pump (hereinafter ESP) when it burns out, the tubing lift ( hereinafter tubing) in case of deposits of asphalt-salt paraffin deposits (hereinafter referred to as paraffin salts) or leakage of tubing and other technological operations. When dismantling the pumping equipment, it becomes necessary to dismantle the measuring devices and control devices associated with the wellhead with a cable (s) or an impulse tube (s) passing inside or outside the pipe string. In particular, to replace the ESP (in the event of a burn-out of the power cable, or premature failure), it becomes necessary to lift the entire packer arrangement separating the layers with installed measuring devices and control devices. To raise the packer arrangement, it is necessary to involve an underground well repair team or well overhaul (hereinafter ORS / KRS), and this leads to significant time and material costs (up to ten days in terms of the time cost factor, up to 1 million rubles, in terms of the salary cost factor the repair team’s fee, as well as the costs associated with reducing oil production depending on the flow rate and water cut of the well fluid). In addition, the disadvantages of this method should also include a very limited range of application of pumping equipment. Essentially, in the known method, only ESP equipment can be used, since only it has design features that allow cable transit wiring.

The problem solved by the invention is to eliminate the above disadvantages of the prototype and increase the effectiveness of the technology of simultaneous-separate or alternate operation of several producing (oil, gas, gas condensate, gas hydrate) and / or injection formations of one well in a multilayer field.

A positive effect from the use of the invention is achieved by increasing the accuracy of the response of actuators to changes in reservoir parameters, ensuring the autonomous functioning of measuring devices and control devices, which will allow them to be dismantled during the above process operations, in addition, the claimed method and device will prevent uncontrolled flows from one layer to another, which are inevitable when they are dismantled in case of use mations analogues or prototypes, while enabling reduction of time and cost during repair work on the replacement of a damaged or failed equipment. The claimed technical solution makes it possible to ensure well operability during cable and pump dismantling, in addition, the range of pumping equipment suitable for use is expanded, and it becomes possible to maintain optimal operation parameters of each formation (facility) in a system of simultaneous and separate operation even during installation / dismantling of the supply cable and pumping equipment.

This problem is solved due to the fact that the known method, including the descent into the well of one pipe string with a constant or variable diameter and an open or muffled lower end, equipped, between the layers or above and between the layers, one or more packers for separation of layers and a control device to control the flow of the working agent during the injection or flow rate of the fluid during production, while in the injection, or fountain, or gas lift, or pump wells at the level of its formation, a pipe string is equipped or measuring device for determining the technological parameters of the working agent during injection or fluid during production, pumping the working agent or producing fluid, directing it through the control device and the measuring transducer, receive measurement information from the measuring transducer and determine the technological parameters of the working agent or fluid for the formations , and if they differ from the design value, the throughput section of the control device is changed until the design value t technological parameters for each of the layers, characterized in that the well is equipped with at least one intelligent control system (IMS) for hydrocarbon production, maintaining reservoir pressure in multi-layer fields, the IMS is programmed to maintain the optimal parameters of each formation in a system of simultaneous and separate operation, it at the level of the upper or any other layer directly at the measuring transducer or control device, connect it electrically ki with a measuring transducer and a regulating device, information on measuring technological parameters is fed to the ISU through the communication interface with the measuring transducer, where they carry out preliminary processing of input information, including analog-to-digital conversion and level matching, then analyze the information received in accordance with the program algorithm ( programmed algorithm), establish the degree of opening or closing of the control device, form a control signal for reg monitoring device in accordance with the established degree of opening or closing of the device, then the control signal through the communication interface with the regulatory device is passed to the regulatory device, while receiving and transmitting control data. The ISU, and / or the measuring transducer, and / or the regulating device are equipped with an autonomous power supply source, or they supply power via a cable from the wellhead, or they charge an autonomous power source through a communication interface with a recharging device, or lower the cable or impulse tube with a recharging unit.

ISUs are equipped with a storage device for storing the results of measurements and / or actions on the control device and record (store) them in the input data storage device.

In the process, as necessary, change the ISU algorithm. Reception and transmission of ISU control data is carried out using a reader through a communication interface, for which a cable or impulse tube with a communication unit is lowered.

It is possible to combine the ISU with a measuring transducer or control device and taking monitored indicators from the system’s storage device to store the measurement results at any time by using any means for reading (removing) information, while it is possible to make corrective actions both in the algorithm of the system and directly into the operation of the elements, components of the units of the claimed device, if necessary.

Known methods are implemented through the use of known devices per se, for example, devices used in the methods according to the patents of the Russian Federation No. 22253009, 2313659, which consist of at least one pipe string with a constant or variable diameter and with an open or plugged lower end, equipped between the layers or higher and between the reservoirs with one or more packers for separating the reservoirs and the regulating device (s) for controlling the flow of the working agent during injection or flow rate of the fluid during production, at the level of its formation, a pipe string or gas lift or gas lift or pump wells are equipped with a pipe string or regulating device (s) with measuring device (s) to determine the technological parameters of the working agent when injecting or producing fluid, for which purpose a cable or impulse tube is connected into the borehole outside or inside the pipe string and connected to the measuring device and (or) the regulating device, the working agent is pumped or fluid is produced, directing it through the regulating device and the measuring device, they take measurement information at the wellhead from the measuring device and determine the technological parameters of the working agent or fluid for the formations, and if they differ from the design value, the throughput section of the regulating device is changed until the design value of the technological parameters for each of the formations is reached by issuing appropriate commands from ground equipment , while known from the prior art technical solutions have the following significant disadvantages:

- the transmission of information and control signals over a considerable distance increases the risk of incorrect transmission of information to the surface, therefore, the error and inaccuracy of the response of actuators to changing reservoir indicators increases. In addition, the presence of the human factor in making a decision (untimely or inaccurate) can lead to a deterioration in the total production rate;

- when dismantling the pumping equipment, it becomes necessary to dismantle the measuring devices and control devices associated with the wellhead with a cable (s) or impulse tube (s) passing inside or outside the pipe string, which leads to significant time and material costs;

- the disadvantages of this method should also include a very limited range of application of pumping equipment.

The objective of the claimed technical solution is to eliminate the above set of disadvantages of the prototype, namely:

1 - reducing the risk of incorrect transmission of information of information and control signals over significant distances;

2 - improving the accuracy of actuators when changing reservoir indicators;

3 - reduction of time and material costs by eliminating the need for dismantling of measuring devices and control devices associated with the wellhead with a cable (s) or impulse tube (s) passing inside or outside the pipe string due to the joint use (application) of the features of the method and devices of an intelligent control system used in the claimed technical solution.

The claimed technical solution in addition to the listed disadvantages allows to provide additional benefits, namely:

4 - provides a significant increase in the accuracy of the response of actuators to changes in reservoir parameters in both normal and emergency modes due to the use of the claimed features of both the method and the device;

5 - provides the possibility of autonomous functioning of the equipment, which allows to realize the possibility of dismantling the pumping and other equipment without dismantling the device itself, consisting of the claimed set of features - an intelligent control system, measuring device, control device;

6 - uncontrolled flows from one layer to another are excluded in the absence of communication with ground-based devices, in contrast to the prototype and prior art on the filing date of application materials;

7 - the range of pumping equipment suitable for use is expanding, because there is no need to use a permanent communication channel with the ground (s) device (s), due to the fact that it is possible to connect ground equipment with equipment installed in the well through a communication interface with a reader and a communication interface with a recharging device by means of a cable or impulse tube equipped with communication center (for example, to read the necessary information, change tasks, etc., and / or recharge the charger (if necessary)).

The claimed technical solution is illustrated by the following materials. Figure 1 presents a schematic view of a device for implementing the inventive method (shows a packer unit with two control devices and measuring devices), which consists of:

1) pumping well

2) pipe columns

3) pipes with a plugged bottom end

4) packer

5) measuring devices

6) regulatory devices

8) intelligent control system

9) communication channel

10) working agent

11) fluid

The method of simultaneous-separate operation of multilayer wells is implemented as follows. One pipe string 2 with a constant diameter and a plugged lower end 3 is lowered into the injection, flowing, gas-lift, or pumping well 1. The pipe string 2 is equipped between the layers P ₁ , P _{2 with} one 4 or more packers, as well as one or more 6 control devices to control the flow of the working agent when it is injected into the reservoirs or the flow rate of the fluid when it is extracted from the reservoirs, at the level of one P ₁ or several P ₁ and P ₂ , or other layers of the well, equip the pipe string 2 with one or more measuring (s) device (s i) 5. In this case, the pipe string 2 is equipped with an intelligent control system (ISU) 8, the ISU 8 is located directly in the well, the ISU 8 (electrically and / or hydraulically and / or wirelessly based on electromagnetic radiation) is connected by a communication channel 9 with a measuring ( i) device (s) 5 and control device 6, program ISU 8 to maintain optimal operating parameters of each formation (object) in a system of simultaneous and separate operation. After installation (mouth) of the fountain reinforcement of the well 1, the working agent 10 is pumped (injection), indicated in FIG. 1 by the downward arrow in the upper part of FIG. 1, or the fluid 11 (production) indicated in FIG. 1 is produced by the upward arrow , in the upper part of Figure 1, directing it (fluid) through one or more 6 control devices and through one or more measuring devices 5 to the surface for subsequent collection and processing of the fluid. In this case, the ISU receives information on the measurement (for example, pressure, temperature, pressure drop, temperature drop, amount of water, gas and oil, etc.) by measuring (s) device (s) 5 and determines the technological parameters (for example, the flow rate of the working agent or flow rate of water, gas and oil, etc.) either of working agent 10 or fluid 11 for formations P ₁ , P ₂ or P ₁ , P ₂ and P ₃ , and if the technological parameters differ from the design value, the flow cross section of one or more control devices 6 until they reach their design value .

Figure 2 shows a schematic block diagram of an intelligent control system (IMS) of the claimed technical solution, consisting of the following elements:

5) measuring device

6) regulatory device

12) communication interface with a measuring device

13) analysis and logic block

14) communication interface with the regulatory device

15) communication interface with a reader

16) communication interface with recharging device

17) autonomous power supply

18) storage device

and works as follows.

Information from the measuring device (s) 5 enters the ISU 8 on the communication interface with the measuring device 12, then the ISU 8, in accordance with the programmed algorithm and the task to be performed, analyzes the received information, saves the input data and parameter values of the control device (devices) in the storage device 18 and the formation of control signals for the control device 6 (the degree of opening or closing of the control device), which through the communication interface with the control device 1 4 are transmitted to the regulating device 6. The claimed arrangement is equipped with an autonomous power supply source 17 located in the IMS 8 and / or in the measuring device 5 and / or the regulating device 6. Reception and transmission of control data, the possibility of changing the algorithm and tasks of the IMS 8, recharging an autonomous source power supply 17 is carried out as necessary through a communication interface with a reader 15 and / or a communication interface with a recharging device 16 by lowering a cable or impulse tube provided with scrap connection and / or charging.

The claimed technical solution meets the criterion of "novelty" presented to the invention, because from the studied prior art, no technical solutions have been identified, characterized by the indicated features of the method and device, presented together, leading to the implementation of the claimed technical results - seven main tasks that can be implemented both collectively and individually, depending on the need to solve those or other tasks in specific practical cases arising from the extraction of minerals (oil, gas, gas condensate, bitumen, mineral water), maintaining reservoir pressure on multilayer fields. It should be noted that the features used in the claimed technical solution are known as such individually in certain well-known technical solutions, however, the applicant has not revealed any information from the studied prior art about technical solutions identical to those used in the claimed combination, namely, not technical solutions are identified that are characterized by the claimed combination of features of the method and device, providing the set of technical results listed in the tasks (goals).

The claimed technical solution meets the criterion of "inventive step" for inventions, because is not obvious to specialists in this field of technology, due to the fact that the claimed technical solution ensures the implementation of objectively existing in practice contradictions that cannot be resolved by conventional design, namely, it ensures the operability of equipment located in the well even when disconnecting it from ground equipment in emergency situations or if there is a need for repair, dismantling and (or) replacement of part of the equipment, such as ground equipment, which is not obvious for a person skilled in the art.

The claimed technical solution meets the criterion of "industrial applicability", because can be implemented at any specialized enterprise using standard equipment and well-known materials and technologies.

Claims (8)

1. The method of simultaneous and separate operation of a multilayer well, including the descent of a pipe string into the well, equipped with a packer and a control device between the formations, while the pipe string or control device is equipped with a measuring transducer in the well at the formation level, a working agent is pumped, or fluid is produced by directing it through the control device and the measuring transducer, receive information on the measurement from the measuring transducer and determine the technological parameters of the working agent or fluid for the reservoir, and if they differ from the design value, the flow section of the control device is changed until the design value of the technological parameters for each of the reservoirs is achieved, characterized in that the well is equipped with an intelligent hydrocarbon production control system, reservoir pressure maintenance, and an intelligent control system is programmed to maintain optimal parameters of the formation in the system of simultaneous-separate operation, place it at the level of the formation directly at the measuring transducer or control device, it is electrically connected with the measuring transducer and control device, information on measuring technological parameters is supplied to the intelligent control system via a communication interface with the measuring transducer, where input information is pre-processed, including analog-to-digital conversion and level matching, then analyze the information received in accordance with the program algorithm (programmed algorithm), the degree of opening or closing of the control device is established, the control signal for the control device is generated in accordance with the set degree of opening or closing of the control device, then the control signal is transmitted to the control device through the communication interface with the control device, and control data is received and transmitted. 2. The method according to claim 1, characterized in that the intelligent control system and / or the measuring transducer and / or the regulating device are equipped with an autonomous power supply source, or are supplied with power via a cable from the wellhead, or the autonomous power supply is charged via the communication interface with a recharging device, or lower the cable or impulse tube with a recharging device. 3. The method according to claim 1, characterized in that the intelligent control system is equipped with a storage device for storing the results of measurements and / or actions on the control device and record (store) them in the storage device. 4. The method according to claim 1, characterized in that, as necessary, change the algorithm of the intelligent control system. 5. The method according to claim 1, characterized in that the reception and transmission of control data of the intelligent control system is carried out using a reader through the communication interface, for which they lower the cable or impulse tube with the communication node. 6. A device for simultaneous and separate operation of multilayer wells, comprising a pump well, a pipe string, a packer, a measuring transducer, a control device, characterized in that it is additionally equipped with an intelligent hydrocarbon production control system and / or reservoir pressure maintenance at multilayer fields, an intelligent control system contains an analysis and logic unit, communication interfaces with a measuring transducer and with a regulating device, while intelligently I management system is installed on the reservoir level directly from the transmitter or control device and electrically connected to them. 7. The device according to claim 6, characterized in that it is equipped with an autonomous power supply source or a recharging device through a communication interface with a recharging device. 8. The device according to claim 6, characterized in that it is equipped with a storage device, a reader connected to an intelligent control system via a communication interface.

Images