CN112228020A - Horizontal well pressure flow double-carrier wave sectional water injection device and system - Google Patents
Horizontal well pressure flow double-carrier wave sectional water injection device and system Download PDFInfo
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- CN112228020A CN112228020A CN201910634683.9A CN201910634683A CN112228020A CN 112228020 A CN112228020 A CN 112228020A CN 201910634683 A CN201910634683 A CN 201910634683A CN 112228020 A CN112228020 A CN 112228020A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 413
- 239000007924 injection Substances 0.000 title claims abstract description 314
- 238000002347 injection Methods 0.000 title claims abstract description 314
- 238000000034 method Methods 0.000 claims abstract description 35
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- 239000003673 groundwater Substances 0.000 claims abstract description 16
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- 238000012360 testing method Methods 0.000 description 21
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- 239000004568 cement Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
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- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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Abstract
The invention provides a horizontal well pressure flow double-carrier wave sectional water injection device and a system, which comprise a ground control device, a pressure adjusting device arranged on a ground water injection pipeline and an intelligent water distributor arranged in each water injection section of an underground water injection control system; the ground control device is used for controlling the pressure regulating device to regulate the water injection pressure of the ground water injection pipeline to form a first pressure wave code; the intelligent water distributor is used for receiving and analyzing the first pressure wave code to obtain control information, and controlling the water injection process according to the control information.
Description
Technical Field
The invention relates to the technical field of intelligent layered water injection in oil fields, in particular to a horizontal well pressure flow double-carrier segmented water injection device and system.
Background
In the process of developing the compact oil in the oil field, because the stratum energy is seriously lacked due to the adoption of quasi-natural energy exploitation, a horizontal well general water injection throughput test is developed in the early stage, the single-layer exploitation degree is only improved, and the overall exploitation degree is relatively low. Later stage water absorption profile tests show that part of horizontal wells have water injection and water absorption profiles with outstanding contradictions, uneven water absorption in intervals exists, and the expected water injection effect cannot be achieved.
Disclosure of Invention
The invention aims to provide a horizontal well pressure flow double-carrier wave sectional water injection device, which meets the requirement of horizontal well intelligent sectional water injection, improves the huff and puff development effect of a compact oil block horizontal well, and realizes oil stabilization and water control. The invention further aims to provide a horizontal well pressure flow double-carrier sectional water injection system.
In order to achieve the aim, the invention discloses a horizontal well pressure flow double-carrier wave sectional water injection device which comprises a ground control device, a pressure adjusting device arranged on a ground water injection pipeline and intelligent water distributors arranged in each water injection section of an underground water injection control system;
the ground control device is used for controlling the pressure regulating device to regulate the water injection pressure of the ground water injection pipeline to form a first pressure wave code;
and the intelligent water distributor is used for receiving and analyzing the first pressure wave code to obtain control information, and controlling the water injection process according to the control information.
Preferably, the surface water injection pipeline comprises an upstream pipeline connected with the water injection station and a pressure reduction pipeline and a water injection pipeline respectively connected with the upstream pipeline;
the pressure regulating device is arranged on the pressure reducing pipeline;
the ground control device is used for controlling the pressure adjusting device to adjust the water pressure on the pressure reducing pipeline so as to adjust the water injection pressure of the water injection pipeline to form a first pressure code.
Preferably, the surface control device comprises a flow rate automatic controller and a first pressure transmitter which are connected into the upstream pipeline, wherein the flow rate automatic controller comprises an electric control valve connected into the upstream pipeline;
the first pressure transmitter is used for detecting the upstream water pressure of the upstream pipeline;
the flow automatic controller is used for receiving the upstream water pressure of the upstream pipeline transmitted by the first pressure transmitter and controlling the size of the valve opening of the electric control valve according to the upstream pressure.
Preferably, the intelligent water distributor is internally provided with an overflowing channel, a water injection channel, an adjustable water nozzle arranged in the water injection channel, a first pressure sensor for detecting the sectional water injection pressure in the water injection channel and a control unit;
a first joint and a second joint which are used for being connected into an underground pipeline connected with the ground water injection pipeline in the underground water injection control system are respectively arranged at two ends of the overflowing channel;
the control unit is used for acquiring the sectional water injection pressure detected by the first pressure sensor, and controlling the opening size of the adjustable water nozzle according to the sectional water injection pressure so as to adjust the sectional water injection pressure.
Preferably, the control unit comprises a segmented water injection controller, a control motor for controlling the opening size of the adjustable water nozzle and a battery module for supplying power to the control motor;
the sectional water injection controller is used for acquiring sectional water injection pressure detected by the first pressure sensor, forming control information according to the sectional water injection pressure, and transmitting the control information to the control motor so that the control motor can adjust the opening size of the adjustable water nozzle.
Preferably, the surface control device further comprises a second pressure transmitter and a surface controller which are connected to the water injection pipeline;
the intelligent water distributor controls the opening of the adjustable water nozzle to change according to water injection parameters or detected stratum parameters in the water injection process to form a second pressure wave code;
the second pressure transmitter is used for detecting water injection pressure corresponding to the second pressure codes in the water injection pipeline and transmitting the water injection pressure to the ground controller;
and the ground controller is used for receiving the water injection pressure corresponding to the second pressure wave code transmitted by the second pressure transmitter and analyzing the change of the water injection pressure to obtain the water injection parameter or the formation parameter.
Preferably, the intelligent water distributor further comprises a second pressure sensor for detecting formation pressure;
the control unit is used for acquiring the formation pressure detected by the second pressure sensor, controlling the opening size of the adjustable water nozzle by the control motor according to the formation pressure, and forming a second pressure wave code corresponding to the formation pressure.
Preferably, the pressure regulating device is a pressure reducing valve.
The invention also discloses a horizontal well pressure flow double-carrier segmented water injection system which comprises a water injection station, a ground water injection pipeline, an underground water injection control system and the segmented water injection device.
Preferably, the subsurface water injection control system comprises a downhole pipeline connected with the surface water injection pipeline and a plurality of packers arranged in the downhole pipeline, and two adjacent packers form a water injection section;
the intelligent water distributor is arranged in the underground pipeline of each water injection section.
Preferably, the underground pipeline comprises an oil pipe and a casing pipe sleeved outside the oil pipe, and an annular space is formed between the oil pipe and the casing pipe;
a plurality of intelligent water distributors are connected into the oil pipe;
and a packer which is sealed with the oil pipe and the sleeve is arranged in an annular space between two adjacent intelligent water distributors.
Preferably, at least one centralizer is further arranged in the annular space and used for providing support for the oil pipe.
According to the invention, the ground control device is used for controlling the on-off state of the pressure regulating device, the water injection pressure of the ground water injection pipeline is regulated, a pressure waveform with a certain rule is formed, namely a first pressure wave code can be formed, and the first pressure wave code formed by the ground water injection pipeline can be transmitted in a long distance. Ground controlling means forms first pressure ripples sign indicating number according to control information, transmits to intelligent water distributor through pipeline in the pit, thereby the water pressure change that intelligent water distributor can detect water injection pipeline injected water obtains first pressure ripples sign indicating number, and intelligent water distributor carries out the analysis to the first pressure ripples sign indicating number of receiving and can obtain the control information that ground controlling means transmitted. The invention realizes the communication between the ground control device and the underground water injection control system by forming the first pressure wave code, can not only meet the requirements of horizontal well huff and puff multi-section separate injection, but also realize the control of the water injection process by remotely controlling the intelligent water distributor, realizes the automatic measurement and adjustment of the underground sectional water injection flow, and has important significance for the development of the oil field ultra-low permeability compact oil.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a horizontal well pressure flow double-carrier segmented water injection device according to a specific embodiment of the invention;
fig. 2 shows a schematic diagram of an intelligent water distributor in a specific embodiment of a horizontal well pressure flow double-carrier segmented water injection device of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to achieve a better water injection effect and exert development potential of a horizontal well, according to one aspect of the invention, the embodiment discloses a horizontal well pressure flow double-carrier segmented water injection device.
As shown in fig. 1, in this embodiment, the segmented water injection device includes a surface control device, a pressure adjusting device disposed on the surface water injection pipeline 12, and an intelligent water distributor disposed in each water injection segment of the underground water injection control system.
Wherein, the surface control device is used for controlling the pressure regulating device to regulate the water injection pressure of the surface water injection pipeline 12, so as to form a first pressure wave code.
And the intelligent water distributor is used for receiving and analyzing the first pressure wave code to obtain control information, and controlling the water injection process according to the control information.
According to the invention, the on-off state of the pressure adjusting device is controlled by the ground control device, the water injection pressure of the ground water injection pipeline 12 is adjusted, a pressure waveform with a certain rule is formed, namely, a first pressure wave code can be formed, and the first pressure wave code formed by the ground water injection pipeline 12 can be transmitted in a long distance. Ground controlling means forms first pressure ripples sign indicating number according to control information, transmits to intelligent water distributor through pipeline in the pit, thereby the water pressure change that water injection pipeline 12 injected water can be detected to intelligent water distributor obtains first pressure ripples sign indicating number, and intelligent water distributor carries out the analysis to the first pressure ripples sign indicating number of receiving and can obtain the control information that ground controlling means transmitted. The invention realizes the communication between the ground control device and the underground water injection control system by forming the first pressure wave code, can not only meet the requirements of horizontal well huff and puff multi-section separate injection, but also realize the control of the water injection process by remotely controlling the intelligent water distributor, realizes the automatic measurement and adjustment of the underground sectional water injection flow, and has important significance for the development of the oil field ultra-low permeability compact oil.
In a preferred embodiment, the surface water injection line 12 may include an upstream line connected to the water injection station 1 and a pressure reducing line 8 and a water injection line 12 connected to the upstream line, respectively. The pressure adjusting device is arranged on the pressure reducing pipeline 8, and the ground control device is used for controlling the pressure adjusting device to adjust the water pressure on the pressure reducing pipeline 8 so as to adjust the water injection pressure of the water injection pipeline 12 to form a first pressure wave code. Preferably, the subsurface water injection control system may include a downhole pipeline connected to the surface water injection pipeline 12, and in particular, the downhole pipeline is connected to the water injection pipeline 12 such that the water injection pressure in the downhole pipeline is the same as the water injection pressure in the water injection pipeline 12.
In this embodiment, with the branch that forms pipeline 8 that steps down between upstream pipeline and water injection pipeline 12, share the water pressure of upstream pipeline jointly through water injection pipeline 12 and pipeline 8 that steps down, can realize that the water pressure on the pipeline 8 that steps down changes through locating the pressure adjusting device on the pipeline 8 that steps down, then the water pressure on the water injection pipeline 12 also can change, thereby realize the change of the water injection pressure of input pipeline in the pit, control water injection pressure's change law, then can form first pressure ripples code, and the first pressure ripples code that water injection pipeline 12 formed can remote transmission.
In a preferred embodiment, the pressure regulating means may employ a pressure reducing valve 9. The ground control device controls the on-off state of the pressure reducing valve 9 to adjust the water injection pressure of the water injection pipeline 12 to form a first pressure wave code, and the intelligent water distributors receive the first pressure wave code and control the water injection process according to the first pressure wave code. By controlling the opening or closing of the pressure reducing valve 9, the water injection pressure in the water injection pipeline 12 can be changed, the fine adjustment of the water injection pressure can be realized, the water injection pressure can be quickly and accurately adjusted, and the transmission efficiency of pressure wave codes is improved.
In a preferred embodiment, the surface control device comprises a flow rate automatic controller 6 and a first pressure transmitter 3 which are connected into the upstream pipeline, wherein the flow rate automatic controller 6 comprises an electric control valve connected into the upstream pipeline, the first pressure transmitter 3 is used for detecting the upstream water pressure of the upstream pipeline, the flow rate automatic controller 6 is used for receiving the upstream water pressure of the upstream pipeline transmitted by the first pressure transmitter 3 and controlling the valve opening size of the electric control valve according to the upstream pressure.
In the normal water injection process, the whole sectional water injection device forms a closed high-pressure system, the flow automatic controller 6 can control the water pressure passing through the flow automatic controller 6, the opening degree of the flow automatic controller 6 is increased, the water pressure in the device is increased, and the water pressure in the device is basically stable after the flow automatic controller 6 is closed. The flow rate autocontrol meter 6 may communicate with the pressure reducing valve 9, and the flow rate autocontrol meter 6 controls the on/off state of the pressure reducing valve 9 by sending a reducing signal to the pressure reducing valve 9 to control the pressure reducing valve 9 to be opened, so that water in the pressure reducing line 8 flows to the outside of the apparatus through the pressure reducing valve 9, and thus the water pressure in the apparatus is reduced. By repeatedly switching the flow automatic controller 6 and the pressure reducing valve 9, the water injection pressure input into the underground water injection control system can be changed, the fluctuation of the pressure along with time is formed, and the injection pressure change in the underground pipeline can form a first pressure wave code with a certain rule. Through the corresponding relation of presetting control information and first pressure ripples code, the first pressure ripples code can be received and discerned to intelligent water injection mandrel among the underground piping, analyzes the control information that can obtain ground control device transmission to the first pressure ripples code of receiving.
In a preferred embodiment, the pressure reducing valve 9 may be a variety of electrically controllable valves such as a flange type solenoid valve. When the pressure reducing valve 9 is a flange type electromagnetic valve, the flow self-controller 6 can transmit pressure reducing information to the flange type electromagnetic valve in a wireless electromagnetic wave mode, so that the flange type electromagnetic valve is opened or closed according to the received pressure reducing information to adjust the water injection pressure of the water injection pipeline 12 and establish the remote communication and control functions between the ground control device and the intelligent water distributor of the horizontal well.
In a preferred embodiment, the end of the depressurization line 8 remote from the upstream line may be connected to a sump 10, so that water in the staged water injection device flows to the sump 10 via the depressurization valve 9 after the depressurization valve 9 is opened.
In a preferred embodiment, as shown in fig. 2, the intelligent water distributor is provided with an overflow channel 22, a water injection channel, an adjustable water nozzle 20 arranged in the water injection channel, a first pressure sensor 23 for detecting the sectional water injection pressure in the water injection channel, and a control unit.
And a first joint 14 and a second joint 25 which are used for being connected into a downhole pipeline connected with the surface water injection pipeline 12 in the underground water injection control system are respectively arranged at two ends of the overflowing channel 22. The water filling channel includes a water inlet 24 and a water outlet 21, and the water inlet 24 of the water filling channel is communicated with the flow channel.
The control unit is used for acquiring the sectional water injection pressure detected by the first pressure sensor 23, and controlling the opening size of the adjustable water nozzle 20 according to the sectional water injection pressure so as to adjust the sectional water injection pressure.
In a preferred embodiment, the control unit comprises a segmented water injection controller, a control motor 18 for controlling the opening size of the adjustable water nozzle 20, and a battery module 15 for supplying power to the control motor 18.
The sectional water injection controller is configured to acquire a sectional water injection pressure detected by the first pressure sensor 23, form control information according to the sectional water injection pressure, and transmit the control information to the control motor 18 so that the control motor 18 adjusts the opening size of the adjustable water nozzle 20.
The control information can be control information including preset water injection parameters and the like, the segmented water injection controller determines whether to start water injection and the flow, pressure and the like of water injection according to the control information, and controls the water injection process according to a pre-stored water injection model. The water injection model can be used for determining water injection parameters such as water injection pressure and water injection flow.
In a preferred embodiment, the surface control means further comprise a second pressure transmitter 7 and a surface controller 4, which are connected to the water injection line 12.
Wherein, the intelligent water distributor controls the opening of the adjustable water nozzle 20 to change according to the water injection parameters or the detected formation parameters in the water injection process to form a second pressure wave code.
The second pressure transmitter 7 is configured to detect a water injection pressure corresponding to the second pressure code in the water injection pipeline 12 and transmit the water injection pressure to the surface controller 4.
And the ground controller 4 is used for receiving the water injection pressure corresponding to the second pressure wave code transmitted by the second pressure transmitter 7 and analyzing the change of the water injection pressure to obtain the water injection parameter or the formation parameter.
Preferably, the intelligent water distributor can detect formation parameters. The intelligent water distributor can form a second pressure wave code according to the detected formation parameters or water injection parameters in the water injection process, the formation parameters or the water injection parameters are transmitted to the ground controller 4, and the ground controller 4 can analyze the second pressure wave code to obtain the water injection parameters or the formation parameters transmitted by the intelligent water distributor. The ground control device can obtain the production dynamic data of ground system flow, pressure parameters, underground layered water injection flow, layered pressure, layered accumulated flow and the like in real time.
In particular, the intelligent water distributor further comprises a second pressure sensor 19 for detecting the formation pressure. The control unit is configured to obtain the formation pressure detected by the second pressure sensor 19, and control the control motor 18 to control the opening size of the adjustable water nozzle 20 according to the formation pressure, so as to form the second pressure wave code corresponding to the formation pressure.
The digital display device 5 can also display stratum parameters under the control of the ground controller 4, and display data such as pressure, flow and the like of the ground controller under the action of the ground controller 4. The ground control device can display and store the flow and pressure parameters of a ground system, the production dynamic data such as underground layered water injection flow, layered pressure, layered accumulated flow and the like in real time, and further can transmit the detected data to a remote central control room.
In a preferred embodiment, the surface control device may further comprise a digital display device 5, and the digital display device 5 may be used for displaying the water filling parameter under the control of the surface controller 4.
In practical application, the segmented water injection device of the embodiment can perform formation pressure drop test, the ground control device can send control instructions of the segmented pressure drop test to each underground intelligent water distributor in a first pressure wave code mode, after each underground intelligent water distributor receives the control instructions, the intelligent water distributors close all water nozzles, the second pressure sensor 19 collects formation pressure of each segment, the first pressure wave code is formed by controlling the opening size of the water nozzles and transmitted to the ground control device, the ground control device obtains pressure data through the second pressure transmitter 7 and analyzes the pressure data to obtain formation pressure transmitted by the underground intelligent water distributors, a curve is drawn according to the formation pressure of each underground segment, and the curve is a formation pressure drop test curve.
In a preferred embodiment, the segmented water injection controller may further form the water injection model to realize automatic adjustment of water injection parameters during water injection. Specifically, the segmented water injection controller is used for acquiring data such as water injection parameters and water injection pressure and/or flow of the water injection pipeline 12 through a water injection experiment before water injection starts, forming a water injection model according to the corresponding relation between the water injection pressure and/or flow and the water injection parameters, and when water injection is performed in a horizontal well, automatically adjusting the water injection parameters through the water injection model, so that the adjustment precision of water injection is improved, and the optimal water injection effect is achieved.
In a preferred embodiment, the segmented water injection controller may include a detection circuit board 16 and an intelligent control chip 17. The detection circuit board 16 is connected to the first pressure sensor 23, and is configured to acquire and process pressure data detected by the first pressure sensor 23. In an alternative embodiment, when a second pressure sensor 19 for detecting the formation pressure is further provided, the detection circuit board 16 is connected to the second pressure sensor 19, and is configured to acquire and process the formation pressure data detected by the second pressure sensor 19.
The intelligent control chip 17 is connected with the detection circuit board 16 and is used for receiving the processed pressure data and controlling the control motor 18 to adjust the opening size of the adjustable water nozzle 20 according to the pressure data.
Specifically, the first connector 14 and the second connector 25 may be mechanically mounted (e.g., screwed) on two ends of the flow passage 22 to connect the flow passage 22 of the intelligent water distributor into the oil pipe 02, and the first connector 14 and the second connector 25 may also be integrally formed with the flow passage 22, which is not limited in the present invention. The control motor 18, the battery module 15, the first pressure sensor 23, the segmented water injection controller and other electrical components can form an electrical component group, the electrical component group is connected with the first connector 14 and the second connector 25 in an inserting connection mode, and the connection positions of the first connector 14 and the second connector 25, the overflowing channel 22 and the electrical component group can be sealed through double rubber rings so as to realize the sealing of the whole intelligent water distributor.
Based on the same principle, the embodiment also discloses a horizontal well pressure flow double-carrier sectional water injection system, which comprises a water injection station 1, a ground water injection pipeline 12, an underground water injection control system and a sectional water injection device according to the embodiment.
In this embodiment, for the convenience of control, an incoming water valve 2 may be further connected to an upstream pipeline between the water injection station 1 and the surface control device. A water injection valve 11 may be connected to the water injection line 12. By opening and closing the water inlet valve 2 and the water injection valve 11, the water injection flow in the upstream pipeline and the water injection pipeline 12 can be controlled, and the water flow in the upstream pipeline and the water injection pipeline 12 can be stopped at any time, so that the water injection is temporarily suspended in emergency, and the like, and various controls of the water injection process are realized.
In a preferred embodiment, the downhole pipeline comprises an oil pipe 02 and a casing 01 which is sleeved outside the oil pipe 02, and an annular space is formed between the oil pipe 02 and the casing 01. A plurality of intelligent water distributors are connected into the oil pipe 02, and packers which are hermetically arranged with the oil pipe 02 and the casing 01 are arranged in annular spaces between every two adjacent intelligent water distributors.
A plurality of intelligent water distributors are connected into the oil pipe 02, a packer is arranged in an annular space between every two adjacent intelligent water distributors, the annular space is divided into a plurality of independent water injection sections by the plurality of packers, and one intelligent water distributor is connected into the oil pipe 02 in each water injection section. The water injection process of each water injection section is controlled through the intelligent water distributor in each water injection section, the water injection process in each water injection section can be independently controlled, segmented water injection in the horizontal well can be realized, and the multi-segment water injection of the horizontal well is not interfered with each other through the segmented water injection of multiple segments, so that a better water injection effect can be achieved.
Further, preferably, at least one centralizer for providing support for the tubing 02 may be further provided in the annular space in the downhole pipeline for maintaining the position of the tubing 02. At the end of the downhole tubing remote from the surface, a horizontal well foot valve 07 may be provided to seal the downhole tubing.
In this embodiment, as shown in FIG. 1, there are 2 horizontal well packers (06 and 06-1) and 3 horizontal well intelligent water distributors (04, 04-1 and 04-2). In other embodiments, N horizontal well packers and N +1 horizontal well through cable intelligent water distributors can be arranged according to actual working conditions for working condition matching, and the number of the tools is not limited by the invention.
In a preferred embodiment, the downhole pipeline comprises a vertical section and a horizontal section, which are connectable by a safety joint 03. And after the underground pipeline is formed, the underground pipeline is connected with a horizontal well pressure flow double-carrier intelligent sectional water injection device to form the real-time control of underground sectional water injection on the ground.
Preferably, the packer of the horizontal well can adopt an FK341 type special packer for the horizontal well, adopts a large channel design, and is a packer capable of washing the well, so that the displacement requirement of a backwashing well is ensured. The FK341 type horizontal well packer adopts a double-deblocking mode which mainly comprises deblocking of a lifting pipe column and assists hydraulic deblocking; by means of the hydraulic auxiliary deblocking system with ingenious design, repeated setting and deblocking can be achieved through changes of the internal and external pressure difference of the oil pipe 02, and hydraulic deblocking can be achieved through a method of large-discharge backwashing when the pipe lifting column deblocking fails.
Preferably, the water injection pipeline 12 is connected with the underground pipeline through a water injection wellhead 13, and the water injection wellhead 13 can adopt a high-pressure wellhead special for a horizontal well, so that the safety and reliability of the water injection process of the water injection well are ensured.
According to the horizontal well pressure flow double-carrier intelligent segmented water injection device, functions of automatic adjustment of horizontal well underground segmented flow, segmented pressure drop testing, and alternate water injection (if alternate water injection is to be executed, the command can be coded on the ground, after the underground intelligent water distributor receives the command, the first segment of water distributor is opened, the rest segments are all closed, water is injected according to the set alternate injection period for a period of time, after the alternate injection period is reached, the water nozzle of the second segment of intelligent water distributor is opened, the rest segments of intelligent water distributor are all closed, water is injected according to the set alternate injection period for a period of time, and the like) can be realized, manual operation is not needed, the test can be encrypted, and the layered water injection can be ensured to meet the injection allocation. The horizontal well pressure flow double-carrier intelligent segmented water injection device realizes ground and underground remote wireless communication, does not need a manual tool, reduces the labor intensity of personnel and reduces the underground operation risk. The horizontal well pressure flow double-carrier intelligent segmented water injection device can meet the requirements of horizontal well huff and puff multi-segment separate injection, can realize automatic measurement and adjustment of horizontal well segmented flow, formation pressure drop test and real-time production parameter recording and storage, and has important significance for developing ultralow-permeability compact oil in oil fields in Changqing.
When the sectional water injection device of the embodiment is installed, the installation method may include:
s100: the method comprises the steps of presetting water injection parameters in the water injection process in a plurality of intelligent water distributors, wherein the water injection parameters can be determined according to data such as the number of water injection layers, the layered injection quantity, the formation pressure, the water injection starting time and the like.
S200: and arranging the plurality of intelligent water distributors and the packers between two adjacent intelligent water distributors in the horizontal well to form an underground pipeline. For example, in the embodiment, the safety joint 03, the intelligent water distributor 04, the horizontal centralizer 05, the packer 06, the intelligent water distributor 04-1, the packer 06-1, the horizontal centralizer 05-1, the intelligent water distributor 04-2 and the horizontal well bottom valve 07 in the horizontal well are arranged in the downhole pipeline of the horizontal well according to the structural requirements of the downhole pipeline designed by the scheme, so that each intelligent water distributor is positioned at different water injection horizons.
Specifically, after a horizontal well is formed by drilling, a casing 01 is firstly put in, all the components are sequentially put into the horizontal well from bottom to top along the underground pipeline according to the positions of all the components of the underground pipeline, and an oil pipe 02 is put in after the packer setting position is confirmed to be correct. Opening the gate of the casing 01, using a cement truck to hold pressure from the oil pipe 02, sequentially pressurizing at 5MPa, 10MPa, 15MPa and 20MPa, stabilizing the pressure for 5min, then increasing the pressure to 25MPa, stabilizing the pressure for 5min, observing whether the outlet of the casing 011 overflows or not, and judging that the pressure is reduced by not more than 0.5MPa, thereby being qualified.
S300: the downhole line is connected to a water injection line 12 of a surface control device. After the pressure is applied to the water injection well mouth 13 according to the standard after the pressure is qualified, pouring the water injection flow of the well mouth, connecting the ground water injection pipeline 12, leading out the cable of the underground water injection control system from the well mouth to be connected with the ground controller 4, and after normal water injection, forming the real-time control of the underground sectional water injection of the ground. Underground layered data are collected and transmitted in real time through an intelligent water distributor in the horizontal well, and automatic layered flow measurement and adjustment, formation pressure drop test and the like are carried out.
S400: the intelligent water distributor executes a water injection process according to preset water injection parameters.
S500: and after the oil pipe 02 is decompressed, the underground pipeline is unsealed. Specifically, after the oil pipe 02 is decompressed, the pipe column load can be lifted to 80KN on the well head, the shear pin is broken and the packer rubber sleeve is recovered and deblocked. If the upper lifting pipe column is not sealed, hydraulic unsealing can be realized by a method of back-flushing the well from the oil casing annulus with large displacement.
The invention is further illustrated below by means of a specific example: taking two layers of separate injection wells as an example, the process of measuring and adjusting the flow rate in layers is explained as follows: before the test, the water injection pressure of the test well is stable, the conditions of long-term stop of injection and the like do not exist, the layered water absorption profile is relatively uniform, and the phenomena of obvious single-layer outburst and the like do not exist.
After underground tools such as an intelligent water distributor and the like are put into a shaft and are pressed to be sealed, the intelligent water distributor controls the opening time of a water nozzle according to preset water injection parameters, the water nozzle can be automatically opened to the maximum opening degree by the upper water distributor and the lower water distributor, test injection before measurement and adjustment is carried out, under the normal condition, the injection pressure of a water injection well is higher, the pressure stability is relatively better, and after a period of test injection, the relation between flow change and pressure change is determined. And determining reasonable injection pressure under the requirement of the injection amount by combining the relation between the early-stage test pressure and the flow, determining a pressure control range for subsequent layered flow measurement and regulation, wherein the normal water injection pressure is necessarily greater than the lowest injection starting pressure value of each layer and is lower than the flow water supply pressure, and simultaneously determining the reasonable water injection pressure by combining the flow and the pressure response degree.
And (4) testing and allocating the layered flow, and setting an automatic testing and allocating mode. The process is generally based on the lowest dose priority rule, i.e., the low dose layer is tested first. The testing process comprises the following steps: except for the testing and adjusting layer, all other water nozzles of the intelligent water distributor are closed, and the first layer of testing and adjusting is carried out. The ground controller 4 sends an instruction, a closed high-pressure system is established by the first pressure wave code intelligent layered water injection device of the whole water injection well, the water inlet condition of a control system of a high-pressure flow automatic controller 6 is increased, the opening of the high-pressure flow automatic controller 6 is increased, the system pressure is increased, after the device is closed, the pressure of the water injection well system is stable, the pressure of the high-pressure well system is reduced through the adjustment and control of a flange type electromagnetic valve, the pressure of the water injection well system is changed by repeatedly switching on and off the high-pressure flow automatic controller 6 and the flange type electromagnetic valve, the pressure fluctuation of the water injection well is realized, the transmission of the first pressure wave code of the closed system is established, and finally, the remote communication and control.
After the first-layer regulation is finished, the water nozzles of the water distributors of the second layer are opened, the test and the allocation are carried out according to the measurement and the allocation process of the water distributors of the first layer, and as the water distributors of the first layer are in a normal water injection state, the ground controller 4 automatically identifies and receives the data of the water distributors of the first layer in the adjustment process of the water distributors of the second layer, controls the total flow of the whole well, and reasonably adjusts the opening degree of the water nozzles of the water distributors of the second layer so as to meet the requirement of the water distribution. If the multi-section horizontal well is the separate injection well, the operation can be finished by analogy according to the method.
In conclusion, the underground intelligent segmented water injection string and the process for the cable preset outside the horizontal well not only can meet the requirements of handling and multi-segment separate injection of the horizontal well, but also can realize automatic measurement and adjustment of the segmented flow of the horizontal well, formation pressure drop test and real-time recording and storage of production parameters, and have important significance for developing ultralow-permeability compact oil in oil fields in Changqing.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (12)
1. A horizontal well pressure flow double-carrier wave sectional water injection device is characterized by comprising a ground control device, a pressure adjusting device arranged on a ground water injection pipeline and intelligent water distributors arranged in each water injection section of an underground water injection control system;
the ground control device is used for controlling the pressure regulating device to regulate the water injection pressure of the ground water injection pipeline to form a first pressure wave code;
and the intelligent water distributor is used for receiving and analyzing the first pressure wave code to obtain control information, and controlling the water injection process according to the control information.
2. The staged water injection device according to claim 1, wherein the surface water injection line comprises an upstream line connected to the water injection station and a pressure reduction line and a water injection line connected to the upstream line, respectively;
the pressure regulating device is arranged on the pressure reducing pipeline;
the ground control device is used for controlling the pressure adjusting device to adjust the water pressure on the pressure reducing pipeline so as to adjust the water injection pressure of the water injection pipeline to form a first pressure code.
3. The staged water injection device according to claim 2, wherein the surface control device comprises a first pressure transmitter and a flow controller connected to the upstream line, wherein the flow controller comprises an electrically controlled valve connected to the upstream line;
the first pressure transmitter is used for detecting the upstream water pressure of the upstream pipeline;
the flow automatic controller is used for receiving the upstream water pressure of the upstream pipeline transmitted by the first pressure transmitter and controlling the size of the valve opening of the electric control valve according to the upstream pressure.
4. The sectional water injection device according to claim 1, wherein an overflow channel, a water injection channel, an adjustable water nozzle arranged in the water injection channel, a first pressure sensor for detecting sectional water injection pressure in the water injection channel and a control unit are arranged in the intelligent water distributor;
a first joint and a second joint which are used for being connected into an underground pipeline connected with the ground water injection pipeline in the underground water injection control system are respectively arranged at two ends of the overflowing channel;
the control unit is used for acquiring the sectional water injection pressure detected by the first pressure sensor, and controlling the opening size of the adjustable water nozzle according to the sectional water injection pressure so as to adjust the sectional water injection pressure.
5. The staged water injection device according to claim 4, wherein the control unit comprises a staged water injection controller, a control motor for controlling the size of the opening of the adjustable water nozzle, and a battery module for supplying power to the control motor;
the sectional water injection controller is used for acquiring sectional water injection pressure detected by the first pressure sensor, forming control information according to the sectional water injection pressure, and transmitting the control information to the control motor so that the control motor can adjust the opening size of the adjustable water nozzle.
6. The staged water injection device according to claim 4, wherein the surface control device further comprises a second pressure transmitter and a surface controller connected to the water injection line;
the intelligent water distributor controls the opening of the adjustable water nozzle to change according to water injection parameters or detected stratum parameters in the water injection process to form a second pressure wave code;
the second pressure transmitter is used for detecting water injection pressure corresponding to the second pressure codes in the water injection pipeline and transmitting the water injection pressure to the ground controller;
and the ground controller is used for receiving the water injection pressure corresponding to the second pressure wave code transmitted by the second pressure transmitter and analyzing the change of the water injection pressure to obtain the water injection parameter or the formation parameter.
7. The staged water injection device according to claim 6, wherein the intelligent water distributor further comprises a second pressure sensor for detecting formation pressure;
the control unit is used for acquiring the formation pressure detected by the second pressure sensor, controlling the opening size of the adjustable water nozzle by the control motor according to the formation pressure, and forming a second pressure wave code corresponding to the formation pressure.
8. The staged water injection device according to claim 1, wherein the pressure regulating device is a pressure reducing valve.
9. The horizontal well pressure flow double-carrier sectional water injection system is characterized by comprising a water injection station, a ground water injection pipeline, an underground water injection control system and the sectional water injection device according to any one of claims 1 to 8.
10. The staged water injection system of claim 9, wherein the subsurface water injection control system comprises a downhole pipeline connected to the surface water injection pipeline and a plurality of packers disposed in the downhole pipeline, two adjacent packers forming one water injection stage;
the intelligent water distributor is arranged in the underground pipeline of each water injection section.
11. The staged water injection system according to claim 10, wherein the downhole pipeline comprises an oil pipe and a casing pipe sleeved outside the oil pipe, and an annular space is formed between the oil pipe and the casing pipe;
a plurality of intelligent water distributors are connected into the oil pipe;
and a packer which is sealed with the oil pipe and the sleeve is arranged in an annular space between two adjacent intelligent water distributors.
12. The staged water injection system of claim 11, wherein at least one centralizer is further disposed in the annular space for supporting the oil pipe.
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| CN201910634683.9A CN112228020A (en) | 2019-07-15 | 2019-07-15 | Horizontal well pressure flow double-carrier wave sectional water injection device and system |
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| CN201910634683.9A CN112228020A (en) | 2019-07-15 | 2019-07-15 | Horizontal well pressure flow double-carrier wave sectional water injection device and system |
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Cited By (1)
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| CN114607327A (en) * | 2022-03-14 | 2022-06-10 | 河北中清永晟石油科技有限公司 | Underground water injection communication method and system |
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