Method and system for automatically controlling code wave-based layered water injection

Abstract

A method and system for automatically controlling code wave-based layered water injection. The method comprises: after a seal verification instruction is received, determining a seal verification layer number on the basis of the seal verification instruction; closing a water nozzle of a water distributor (300) of a seal verification layer corresponding to the seal verification layer number, collecting the external pressure and the internal pressure of an oil pipe in real time by means of the water distributor (300) of the seal verification layer; when the change trends of the external pressure and the internal pressure of the oil pipe are consistent, sending a packer sealing failure instruction to the ground; and when the change trends of the external pressure and the internal pressure of the oil pipe are inconsistent, sending a packer sealing success instruction to the ground; after a distribution instruction is received, sending a layered flow target value to a water distributor (300) of each layer under the well; starting measurement and adjustment of the water distributor (300) of each layer; when the flow of each layer reaches the layered flow target value within a preset time period, ending the measurement and adjustment of the water distributor (300) of each layer.

Description

Wave code injection automatic control method and system Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a wave code injection automatic control method and system. Background Art

[0002] This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. No statement herein is admitted to be prior art by virtue of its inclusion in this section.

[0003] As the development of the oil field deepens, the water injection effect of the oil field becomes worse and the contradiction between layers becomes prominent. For an oil field with many oil-bearing strata and serious intra- and inter-layer heterogeneity, due to the large differences in the geological properties of each layer, water usually does not enter the oil layer in proportion, and stratified water injection technology must be adopted.

[0004] The communication protocol between the ground control system and the downhole intelligent water distributor used in the current wave code layered water injection system is based on the original water injection experience of the understanding of the water absorption of the formation. The one-way communication transmission time is long, and the allocation method requires a person sitting in front of a computer to increase or decrease the pressure to allocate the flow of each layer. The allocation time is long and requires professional operation.

[0005] Summary of the Invention

[0006] An embodiment of the present invention provides a wave code injection automatic control method for improving the efficiency of wave code injection automatic control. The method includes:

[0007] After receiving the sealing inspection instruction, determine the sealing layer number according to the sealing inspection instruction;

[0008] Close the water distributor nozzle of the sealing layer corresponding to the sealing layer number;

[0009] The external and internal pressures of the oil pipes are collected in real time through the water distributor of the seal layer;

[0010] When the external and internal pressures of the tubing change in the same trend, a packer seal failure instruction is sent to the surface;

[0011] When the changing trends of the external and internal pressures of the tubing are inconsistent, a packer sealing effective instruction is sent to the ground;

[0012] After receiving the allocation instruction, the target value of layered flow rate is sent to the water distributors of each layer in the well;

[0013] At the same time, start the test and adjustment of water distributors on each floor;

[0014] When the flow rate of each layer reaches the stratified flow target value within the preset time period, the measurement and adjustment of the water distributors on each layer are completed.

[0015] The embodiment of the present invention further provides a wave code dispensing automatic control system for improving the efficiency of wave code dispensing automatic control, the system comprising: a control platform and a water distributor;

[0016] Control platform, used to send seal verification instructions;

[0017] The water distributor is used to close the water nozzle after receiving the seal verification instruction; collect the external pressure and internal pressure of the oil pipe in real time; send the packer seal failure instruction to the ground when the change trends of the external pressure and internal pressure of the oil pipe are consistent; send the packer seal validity instruction to the ground when the change trends of the external pressure and internal pressure of the oil pipe are inconsistent.

[0018] In the embodiment of the present invention, after receiving the sealing inspection instruction, the sealing inspection layer position number is determined according to the sealing inspection instruction; the water nozzle of the sealing inspection layer corresponding to the sealing inspection layer position number is closed; the external pressure and the internal pressure of the oil pipe are collected in real time through the water distributor of the sealing inspection layer; when the changing trends of the external pressure and the internal pressure of the oil pipe are consistent, the packer sealing failure instruction is sent to the ground; when the changing trends of the external pressure and the internal pressure of the oil pipe are inconsistent, the packer sealing validity instruction is sent to the ground; after receiving the deployment instruction, the stratified flow target value is sent to the water distributors of each layer in the well; and at the same time, the measurement and adjustment of the water distributors of each layer are started;

[0019] When the flow rate in each layer reaches the target stratified flow rate within a preset time period, the testing and adjustment of the water distributors in each layer is completed. Compared with existing technologies, only a seal verification instruction needs to be issued from the control platform. The system automatically completes the seal verification of each layer of the packer downhole and feeds the packer verification results back to the monitoring platform. The water distributors in the sealing layer are used to collect real-time external and internal pressures of the tubing. The sealing result is determined based on whether the changing trends of the external and internal pressures are consistent, which improves the sealing efficiency. After receiving the deployment instruction, automatic testing and adjustment are initiated, which improves the efficiency of automatic control of wave code injection and reduces the difficulty and cost of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0021] FIG1 is a schematic flow chart of the automatic control method for wave code injection provided by the present invention;

[0022] FIG2 is a schematic flow chart of the automatic control method for wave code injection provided by the present invention;

[0023] FIG3 is a schematic diagram of a wave code instruction sent from the surface to the underground provided by the present invention;

[0024] FIG4 is a schematic diagram of the return code from underground to the surface provided by the present invention;

[0025] FIG5 is a schematic diagram of the wave code injection automatic control system provided by the present invention;

[0026] FIG6 is a schematic diagram of a water distributor provided by the present invention;

[0027] FIG7 is a schematic structural diagram of a faucet provided by the present invention. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0029] FIG1 is a flow chart of an automatic control method for wave code injection provided by an embodiment of the present invention. As shown in FIG1 , the method includes:

[0030] Step 101: After receiving the sealing verification instruction, determine the sealing layer number according to the sealing verification instruction.

[0031] Step 102: close the water distributor faucet of the sealing layer corresponding to the sealing layer number.

[0032] Step 103: The external pressure and internal pressure of the oil pipe are collected in real time through the water distributor of the sealing layer.

[0033] Step 104 : When the changing trends of the external pressure and the internal pressure of the tubing are consistent, a packer seal failure instruction is sent to the surface.

[0034] Step 105: When the changing trends of the external pressure and the internal pressure of the tubing are inconsistent, a packer sealing effective instruction is sent to the surface.

[0035] In a possible implementation, a five-digit code is used to send a packer sealing valid instruction to the surface.

[0036] In one possible implementation, a surface controller controls the pressure changes within the wellbore, while a water distributor in the sealing layer checks whether the external and internal pressures of the tubing change synchronously. If they do not change synchronously, the packer seal in the current layer is intact. If they change synchronously, the packer seal has failed.

[0037] For example, the surface controller controls the pressure changes within the wellbore, while the seal layer water distributor checks whether the external and internal pressures of the tubing change synchronously. If they do not change synchronously, the downhole controller sends a command "1" to the surface; if they do, the downhole controller sends a command "2" to the surface.

[0038] This solution requires only a seal verification command to be issued from the control platform. The system automatically verifies the seals of each packer layer downhole and feeds the verification results back to the monitoring platform. Water distributors at the test layer collect real-time external and internal tubing pressures. Verification results are determined based on whether the pressure trends are consistent. This improves seal verification efficiency, enhances the efficiency of automatic wave code injection control, and reduces operational complexity and costs.

[0039] After receiving the deployment instruction, the embodiment of the present invention follows the steps shown in FIG2 , which are as follows:

[0040] Step 201: Send the target value of layered flow rate to each layer water distributor in the well.

[0041] In a possible implementation, the surface controller sends layered flow target values ​​to the water distributors at each layer underground via wave code instructions.

[0042] It should be noted that the wave code instruction consists of a wake-up bit, a data bit, and a check bit; the data bit consists of a layer number and a control instruction.

[0043] The water distributors at each layer underground store the target flow rate of each layer and collect the current flow rate value in real time.

[0044] Step 202: Start the test and adjustment of the water distributors on each floor simultaneously.

[0045] The automatic measurement and adjustment function is enabled in each layer underground.

[0046] Step 203: When the flow rate of each layer reaches the target flow rate of each layer within the preset time period, the measurement and adjustment of the water distributors of each layer are terminated.

[0047] The above solution only requires issuing allocation instructions on the remote control platform, and the system will automatically complete the stratified flow measurement and adjustment. The traditional wave code communication allocation method requires professionals to continuously reduce and increase the pressure, switch, and adjust the water nozzle of the downhole water distributor to achieve stratified flow allocation for the entire well. Compared with the existing technology, it improves the allocation efficiency.

[0048] In one possible implementation, the ground controller sends wave code instructions to the downhole water distributor using binary coding rules, as shown in Figure 3. The data frame includes a wake-up bit 3T, data bits 8T (of which the layer number is 3T and the control instruction is 5T), and a data check bit 1T, where T is the minimum code element, representing the minimum time unit of 1 high bit or low bit.

[0049] A command code consists of a wake-up bit, data bits, and a check bit. The data bits consist of the layer number and the control command. The layer number is three bits, 000 to 110, representing layers 1 to 7, respectively. The command bits, 00000 to 11111, represent 32 commands, each representing a different control. After the data bits are completed, a low-level T acts as a checksum, terminating the signal transmission.

[0050] In the above scheme, the wave code instruction consists of a wake-up bit, a data bit, and a check bit, which improves the communication efficiency.

[0051] In one possible implementation, the code sent from underground to the surface adopts a quinary encoding rule. Compared with the original decimal encoding, the communication time is greatly shortened, and the number of underground motor actions and power consumption are not increased.

[0052] As shown in Figure 4, a signal code consists of a start code, a data code, and an end code. All three codes are low-order codes (low-order codes are valid); each code is separated by an interval code, which is a high-order code (high-order codes are valid). The downhole return code signal begins with a fixed low-level signal for 2 seconds (S is the unit of time) as the start code, followed by 1 to 3 data codes D1 to D3, which are used to transmit 1 to 3 digits, with the value incremented by 1 every 5. After the 3-bit data code ends, a low-level signal for 2 seconds serves as the end code, ending the signal transmission.

[0053] Ignoring the start and end bits, assuming the data transmitted is the two-digit decimal number "56," the communication time required is 5 seconds. Compared to the traditional encoding method, where each digit takes 10 seconds, this saves 75% of the communication time. The faucet needs to be actuated twice, halving the energy consumption and doubling its service life.

[0054] The above encoding method improves communication efficiency, reduces the energy consumption of the water nozzle operation, reduces the number of times of going up and down the well to replace the battery, reduces the workload, and improves production efficiency.

[0055] The following example illustrates an automatic control method for wave code injection provided by an embodiment of the present invention:

[0056] S1: The ground controller sends a mixing instruction to the downhole water distributor.

[0057] S2: The water distributors on each layer receive and store the flow target value in sequence from top to bottom.

[0058] S3: The automatic measurement and adjustment function of the underground water distributors on each layer is simultaneously turned on.

[0059] S4: The ground controller maintains the constant current mode and cooperates with the underground to complete the measurement and adjustment.

[0060] S5: Test and adjust the water distributors on each floor from top to bottom, one minute each time.

[0061] It should be noted that the test and adjustment time may also be 2 minutes, 3 minutes, etc., and the embodiment of the present invention does not specifically limit this.

[0062] S6: After the water distributors on each floor are adjusted to the target flow value, continue monitoring for 5 minutes.

[0063] S7: Determine whether the flow rates of the water distributors on each floor meet the flow target value within 5 minutes.

[0064] S8: If yes, end the test and adjustment; otherwise, continue the test and adjustment.

[0065] FIG5 is a schematic diagram of a wave code injection automatic control system provided by an embodiment of the present invention. As shown in FIG5 , the system includes: a control platform 100 and a water distributor 300;

[0066] Control platform 100, used to send seal verification instructions;

[0067] The water distributor 300 is used to close the water nozzle after receiving the sealing verification instruction; collect the external pressure and internal pressure of the oil pipe in real time; when the changing trends of the external pressure and internal pressure of the oil pipe are consistent, send the packer sealing failure instruction to the ground; when the changing trends of the external pressure and internal pressure of the oil pipe are inconsistent, send the packer sealing validity instruction to the ground.

[0068] In the embodiment of the present invention, the present invention further includes: a ground controller 200;

[0069] The control platform 100 is also used to send deployment instructions;

[0070] The ground controller 200 is used to send a stratified flow target value after receiving a deployment instruction;

[0071] The water distributor 300 is also used to start measurement and adjustment; when the flow rate of each layer reaches the target value of the layered flow rate within a preset time period, the measurement and adjustment is ended.

[0072] The water distributor 300 is specifically used for:

[0073] Collect the current layer flow and read the layered flow target value;

[0074] When the difference between the current layer flow rate and the stratified flow rate target value is greater than a preset ratio, determining whether the current layer flow rate is less than the stratified flow rate target value;

[0075] If yes, open the faucet according to the ratio of the difference between the current layer flow rate and the stratified flow rate target value to the current layer flow rate; otherwise, close the faucet according to the ratio of the difference between the current layer flow rate and the stratified flow rate target value to the current layer flow rate. When the motor adjustment time is longer than the preset time, calculate the next automatic test and adjustment time and end the test and adjustment;

[0076] When the difference between the current layer flow rate and the layered flow rate target value is not greater than the preset ratio and the motor adjustment time is greater than the preset time, the next automatic measurement and adjustment time is calculated and the measurement and adjustment is ended.

[0077] The surface controller 200 is specifically used to send layered flow target values ​​to the water distributors at each layer underground through wave code instructions.

[0078] As shown in Figure 6, the water distributor includes an upper joint, an outer protective tube, a circuit board battery, a motor battery, a main control circuit, a lower joint, a central flow channel, a faucet, a pressure detection sensor and a flow meter; the outer circumference of the lower end of the upper joint is screwed into the upper port of the outer protective tube, the upper outer circumference of the lower joint is screwed into the lower port of the outer protective tube, and the lower port of the central flow channel is pressed on the top of the lower joint; the circuit board battery, the motor battery and the main control circuit are placed in the annulus between the outer protective tube and the central flow channel; the faucet is connected to the lower joint through a thread, and the pressure detection sensor and the flow meter are integrated in the lower joint.

[0079] In a possible implementation, the water outlet of the faucet is in an inverted triangle structure.

[0080] As shown in FIG7 , the water outlet of the faucet is an inverted triangle structure.

[0081] The above solution integrates flow testing module, pressure sensor, power supply, control circuit, mechatronic water nozzle to realize main functions such as seal verification of packer, pressure and flow monitoring inside and outside the water nozzle, automatic flow measurement and adjustment, and wave code communication; the flow meter is integrated into the lower joint body, the number of seals is reduced, the reliability of the instrument is improved while reducing the risk of blockage; the water nozzle outlet is designed with an inverted triangle structure, and a large-sized water outlet is added at the tail to improve the adjustment characteristics of the water nozzle. When the injected medium contains large solid particle impurities, the rear section can be opened to increase the flow area, keep the injection channel unobstructed, and can well meet the requirements of reinjection of produced water and profile adjustment testing.

[0082] In the embodiment of the present invention, after receiving the sealing inspection instruction, the sealing inspection layer position number is determined according to the sealing inspection instruction; the water nozzle of the sealing inspection layer corresponding to the sealing inspection layer position number is closed; the external pressure and the internal pressure of the oil pipe are collected in real time through the water distributor of the sealing inspection layer; when the changing trends of the external pressure and the internal pressure of the oil pipe are consistent, the packer sealing failure instruction is sent to the ground; when the changing trends of the external pressure and the internal pressure of the oil pipe are inconsistent, the packer sealing validity instruction is sent to the ground; after receiving the deployment instruction, the stratified flow target value is sent to the water distributors of each layer in the well; and at the same time, the measurement and adjustment of the water distributors of each layer are started;

[0083] When the flow rate in each layer reaches the target stratified flow rate within a preset time period, the testing and adjustment of the water distributors in each layer is completed. Compared with existing technologies, only a seal verification instruction needs to be issued from the control platform. The system automatically completes the seal verification of each layer of the packer downhole and feeds the packer verification results back to the monitoring platform. The water distributors in the sealing layer are used to collect real-time external and internal pressures of the tubing. The sealing result is determined based on whether the changing trends of the external and internal pressures are consistent, which improves the sealing efficiency. After receiving the deployment instruction, automatic testing and adjustment are initiated, which improves the efficiency of automatic control of wave code injection and reduces the difficulty and cost of operation.

[0084] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0085] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0086] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0087] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0088] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wave code injection automatic control method, characterized in that: include: After receiving the seal inspection instruction, determine the seal inspection layer number according to the seal inspection instruction; Close the water distributor faucet of the sealing layer corresponding to the sealing layer position number; The external and internal pressures of the oil pipe are collected in real time through the water distributor of the seal layer; When the changing trends of the external and internal pressures of the tubing are consistent, a packer seal failure instruction is sent to the ground; When the changing trends of the external and internal pressures of the tubing are inconsistent, a packer sealing effective instruction is sent to the ground; After receiving the allocation instruction, the target value of layered flow is sent to the water distributors at each layer in the well; At the same time, start the test and adjustment of water distributors on each floor; When the flow rate of each layer reaches the stratified flow target value within the preset time period, the measurement and adjustment of the water distributors on each layer are terminated.

2. The wave code injection automatic control method according to claim 1, characterized in that: Send stratified flow target values ​​to each layer of water distributors in the well, including: The layered flow target value is sent to each layer water distributor in the well through the wave code instruction; the wave code instruction consists of a wake-up bit, a data bit, and a check bit; the data bit consists of a layer number and a control instruction.

3. The wave code injection automatic control method according to claim 1, characterized in that: Send effective instructions for packer sealing to the surface, including: Pentadecimal coding is used to send effective instructions for packer sealing to the ground.

4. A wave code injection automatic control system, characterized in that: include: Control platforms and water distributors; Control platform, used to send seal verification instructions; The water distributor is used to close the water nozzle after receiving the seal verification instruction; collect the external pressure and internal pressure of the oil pipe in real time; send the packer seal failure instruction to the ground when the change trends of the external pressure and internal pressure of the oil pipe are consistent; send the packer seal validity instruction to the ground when the change trends of the external pressure and internal pressure of the oil pipe are inconsistent.

5. The wave code injection automatic control system as claimed in claim 4, characterized in that: Also includes: Ground controls; The control platform is also used to send deployment instructions; A ground controller is used to send a layered flow target value after receiving a deployment instruction; The water distributor is also used to start measurement and adjustment; when the flow rate of each layer reaches the target value of the stratified flow rate within the preset time period, the measurement and adjustment is ended.

6. The wave code injection automatic control system according to claim 5, characterized in that: The water distributor is specifically used for: Collect the current layer flow and read the layered flow target value; When the difference between the current layer flow and the layered flow target value is greater than a preset ratio, determining whether the current layer flow is less than the layered flow target value; If yes, open the faucet according to the ratio of the difference between the current layer flow and the stratified flow target value to the current layer flow; otherwise, close the faucet according to the ratio of the difference between the current layer flow and the stratified flow target value to the current layer flow; when the motor adjustment time is longer than the preset time, calculate the next automatic test and adjustment time and end the test and adjustment; When the difference between the current layer flow rate and the layered flow rate target value is not greater than the preset ratio and the motor adjustment time is greater than the preset time, the next automatic measurement and adjustment time is calculated and the measurement and adjustment is ended.

7. The wave code injection automatic control system according to claim 5, characterized in that: The ground controller is specifically used for: The layered flow target value is sent to each layer water distributor in the well through the wave code instruction; the wave code instruction consists of a wake-up bit, a data bit, and a check bit; the data bit consists of a layer number and a control instruction.

8. The wave code injection automatic control system according to claim 5, characterized in that: The water distributor is specifically used for: Pentadecimal coding is used to send effective instructions for packer sealing to the ground.

9. The wave code injection automatic control system according to claim 5, characterized in that: The water distributor comprises an upper joint, an outer protective tube, a circuit board battery, a motor battery, a main control circuit, a lower joint, a central flow channel, a faucet, a pressure detection sensor and a flow meter; the lower end outer circumference of the upper joint is screwed into the upper port of the outer protective tube, the upper outer circumference of the lower joint is screwed into the lower port of the outer protective tube, and the lower port of the central flow channel is pressed on the top of the lower joint; the circuit board battery, the motor battery and the main control circuit are placed in the annulus between the outer protective tube and the central flow channel; the faucet is connected to the lower joint through threads, and the pressure detection sensor and the flow meter are integrated in the lower joint.

10. The wave code injection automatic control system according to claim 5, characterized in that: The water outlet of the faucet is in an inverted triangle structure.

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