An intelligent wave code injection data transmission method

Abstract

The present invention discloses a method for transmitting data through intelligent wave code injection, which belongs to the field of intelligent injection technology. The method includes the steps of transmitting instructions from the ground to the underground and transmitting data from the underground to the ground; when implementing the step of transmitting instructions from the ground to the underground, the control system switches the wellhead regulating valve according to the preset coding rules based on the configuration of the upper computer to form a regular pressure change, thereby sending an instruction sequence to the underground water distributor; when implementing the step of transmitting data from the underground to the ground, in response to receiving the instruction sequence, the underground water distributor corresponding to each water injection layer, based on the indication of the instruction sequence, sequentially provides a constant flow according to the numerical value to be transmitted, or opens the water nozzle of a single underground water distributor, so that the ground detection device detects the numerical value, thereby obtaining the data transmitted from the underground. This method does not need to encode and transmit the numerical value by switching the water nozzle of the underground water distributor multiple times, eliminating the data encoding link, greatly saving data transmission time, and improving data transmission efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent injection, and in particular relates to an intelligent wave code injection data transmission method. Background Art

[0002] In the development and production of intelligent stratified injection (or stratified water injection) wells in oil and gas fields, stratified flow rate and formation pressure data are the primary basis for feedback on water injection results and are also important parameters for adjusting the stratified water injection rate. Therefore, accurate and efficient data transmission has a significant impact on the development results of intelligent stratified injection wells in oil and gas fields.

[0003] The cable-free data transmission commonly used in the industry currently mainly includes two implementation plans, the first is the communication short-section method, and the second is the wave code communication method. Among them, the communication short-section method mainly obtains the test data of the downhole water distributor through short-distance wireless transmission between the communication short-section and the downhole water distributor. At the same time, the communication short-section is connected to the ground through an armored cable to realize data transmission. Although this method can quickly obtain data, it requires the support of the test team at the wellhead operation and related supporting tools. The operation is complicated and the cost is high. The wave code communication method does not require cables and wellhead operations. Data transmission is achieved by using a coding method that changes the pressure and flow in the flow channel by switching valves. The numerical value is also encoded and transmitted by switching the water nozzle of the downhole water distributor. This method can complete the reading of downhole data without human intervention, but because it uses mechanically operated valves as a coding method, the data transmission rate is limited.

[0004] Therefore, providing a more efficient, fast and low-cost intelligent wave code segmentation data transmission method has become a technical problem that needs to be solved urgently. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides an intelligent wave code segmentation data transmission method. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] The present invention proposes an intelligent wave code injection data transmission method, which is applied to an intelligent wave code injection system. The intelligent wave code injection system includes a host computer, a surface part, and multiple downhole water distributors; the host computer is used to provide an operation interface for interaction with the user and store test data to generate reports; the surface part includes a control system, a wellhead regulating valve, and a surface detection device; the multiple downhole water distributors are arranged on the oil pipe and correspond to each water injection layer, and adjacent water injection layers are separated by a packer; each downhole water distributor includes a downhole detection device and a water nozzle;

[0007] The method comprises the steps of transmitting instructions from the surface to the downhole and transmitting data from the downhole to the surface; wherein the data comprises flow data and formation pressure data;

[0008] When implementing the step of transmitting instructions from the surface to the downhole, the control system, based on the configuration of the host computer, opens and closes the wellhead regulating valve according to the preset coding rules to form a regular pressure change, thereby sending the instruction sequence to the downhole water distributor;

[0009] When implementing the step of transmitting data from underground to the ground, in response to receiving the instruction sequence, the downhole water distributor corresponding to each water injection layer, based on the instructions of the instruction sequence, sequentially provides a constant flow according to the numerical value to be transmitted, or opens the water nozzle of a single downhole water distributor to enable the ground detection device to detect the numerical value, thereby obtaining the data transmitted from underground.

[0010] In one possible implementation of the present invention, when implementing the step of transmitting instructions from the ground to the underground, the control system switches the wellhead regulating valve based on the configuration of the upper computer, specifically according to the rules of binary coding or pulse width modulation, to form regular pressure changes, thereby sending different instruction sequences to the underground water distributor.

[0011] In a possible implementation of the present invention, the method further includes the step of transmitting target injection flow rate data from the surface to the downhole;

[0012] When implementing the step of transmitting the target injection flow data from the ground to the underground, the control system, based on the configuration of the upper computer, controls the corresponding underground water distributor according to the target injection flow data of each injection layer; the underground detection device corresponding to each underground water distributor obtains its own target injection flow data by detecting the flow value.

[0013] In a possible implementation of the present invention, after each downhole water distributor obtains its own target injection flow rate data, the following further comprises:

[0014] Adjust the water nozzle opening of each downhole water distributor so that the flow value of each downhole water distributor is within the allowable error range to achieve stratified water injection.

[0015] In a possible implementation of the present invention, the method further includes a data recording step, which specifically includes:

[0016] During the stratified water injection process of the intelligent wave code injection system, each downhole water distributor uses the downhole detection device to regularly record the flow data and formation pressure data of each layer.

[0017] In one possible implementation of the present invention, when implementing the step of transmitting data from underground to the ground, in response to the received instruction sequence indicating the acquisition of flow data, the downhole water distributor corresponding to each injection layer uses the most recently recorded flow data as the target value to be transmitted, and based on the respective target values, maintains a constant flow in sequence in a preset order; the ground detection device uses a flow meter to detect the constant flow value, thereby obtaining the flow data transmitted underground.

[0018] In one possible implementation of the present invention, when implementing the step of transmitting data from underground to the ground, in response to the received instruction sequence indicating the acquisition of formation pressure data, the downhole water distributor corresponding to each injection layer uses the most recently recorded formation pressure data as the target value to be transmitted, and based on the respective target values, a constant flow is sequentially maintained in a preset order; the ground detection device uses a flow meter to detect the constant flow value, thereby obtaining the formation pressure data transmitted underground.

[0019] In a possible implementation of the present invention, when implementing the step of transmitting data from underground to the surface, before each underground water distributor maintains a constant flow, the water nozzles of other underground water distributors need to be closed first.

[0020] In one possible implementation of the present invention, when implementing the step of transmitting data from underground to the ground, in response to the received instruction sequence indicating the acquisition of formation pressure data, the downhole water distributors corresponding to each water injection layer open the water nozzles in sequence according to a preset order to connect with the formation, and close the water nozzles of other downhole water distributors when the water nozzle of each downhole water distributor is opened; the ground detection device uses a pressure gauge to detect the pressure value, and adds it to the pressure of the liquid injection to obtain the formation pressure data transmitted from underground.

[0021] In a possible implementation of the present invention, during the process of transmitting formation pressure data from underground to the surface, the water injection valve needs to be closed on the surface, and a time gap for normal water injection needs to be reserved before obtaining pressure data of different injection layers.

[0022] Beneficial effects of the present invention:

[0023] 1. The present invention provides an intelligent wave code injection data transmission method. When transmitting instructions from the ground to the underground, the control system of the ground part, based on the configuration of the upper computer, switches the wellhead regulating valve according to the preset coding rules to form a regular pressure change, thereby sending a command sequence to the underground water distributor; when transmitting data from the underground to the ground, in response to receiving the command sequence, the underground water distributor corresponding to each water injection layer, based on the instructions of the command sequence, sequentially maintains a constant flow according to the value to be transmitted, or opens the water nozzle of a single underground water distributor, so that the ground detection device detects the value, thereby obtaining the data transmitted from the underground. This method realizes data transmission through the mode of single-layer constant flow or opening the water nozzle and ground detection. There is no need to encode and transmit the value by repeatedly switching the water nozzle of the underground water distributor, which eliminates the data encoding link, greatly saves data transmission time, and improves data transmission efficiency.

[0024] 2. The intelligent wave code injection data transmission method provided by the present invention connects the pressure of the ground detection device with the formation when transmitting formation pressure data from underground to the ground, and obtains the formation pressure data by combining the pressure detected on the ground with the liquid column pressure. There is no need to repeatedly switch the water nozzle of the underground water distributor to encode and transmit the value, thereby improving the data transmission efficiency.

[0025] 3. The intelligent wave code injection data transmission method provided by the present invention is simple and easy to implement, does not require complicated wellhead operations and supporting tools, and reduces operating costs.

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of an intelligent wave code injection system provided by an embodiment of the present invention;

[0028] Figure 2 A flow chart of an intelligent wave code splitting and data transmission method provided by an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of an instruction sequence provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] The present invention provides an intelligent wave code segmentation data transmission method, which is applied to the intelligent wave code segmentation system. Figure 1 , Figure 1 A structural schematic diagram of an intelligent wave code injection system provided for an embodiment of the present invention includes: a host computer, a ground part and multiple downhole water distributors (referred to as water distributors); the host computer is used to provide an operation interface for interaction with the user, and store test data to generate reports; the ground part includes a control system, a wellhead regulating valve and a ground detection device; multiple downhole water distributors are arranged on the oil pipe and correspond to each water injection layer, and adjacent water injection layers are separated by packers; each downhole water distributor includes a downhole detection device and a water nozzle.

[0032] Optionally, as an implementation method, the downhole part is as follows Figure 1As shown, this embodiment uses three water distributors as an example. From top to bottom, they are Water Distributor I, Water Distributor II, and Water Distributor III, correspondingly installed in the three injection layers of the oil pipeline. Adjacent injection layers are separated by Packers I, II, III, and IV. The upper portion of the oil pipeline is connected to the surface via casing, and the bottom of the pipeline is also equipped with a center ball, screen, and screw plug.

[0033] It is understood that in this embodiment, the surface detection device and the downhole detection device both include flow meters and pressure gauges to facilitate detection of surface and downhole flow and pressure. In addition, detection devices such as thermometers can be added according to actual needs to detect temperature or other data.

[0034] The present invention provides an intelligent wave code injection data transmission method applied to the above-mentioned intelligent wave code injection system, which is realized through the coordinated operation of the host computer, the ground part and the downhole water distributor. Figure 2 , Figure 2 A flow chart of an intelligent wave code injection data transmission method provided by an embodiment of the present invention mainly includes the steps of transmitting instructions from the surface to the downhole and transmitting data from the downhole to the surface; wherein the data includes flow data and formation pressure data;

[0035] When implementing the step of transmitting instructions from the surface to the downhole, the control system, based on the configuration of the host computer, opens and closes the wellhead regulating valve according to the preset coding rules to form a regular pressure change, thereby sending the instruction sequence to the downhole water distributor;

[0036] When implementing the step of transmitting data from underground to the ground, in response to receiving the instruction sequence, the downhole water distributor corresponding to each water injection layer, based on the instructions of the instruction sequence, sequentially provides a constant flow according to the numerical value to be transmitted, or opens the water nozzle of a single downhole water distributor to enable the ground detection device to detect the numerical value, thereby obtaining the data transmitted from underground.

[0037] Optionally, as an implementation method, when implementing the step of transmitting instructions from the ground to the underground, the control system switches the wellhead regulating valve based on the configuration of the upper computer, specifically according to the rules of binary coding or pulse width modulation, to form regular pressure changes, thereby sending different instruction sequences to the underground water distributor.

[0038] It should be noted that the regular pressure changes formed by switching the wellhead regulating valve according to the binary coding or pulse width modulation rules can be understood as a preset switching sequence. For example, a series of pressure pulse sequences can be generated according to the pulse width modulation rules, such as Figure 3As shown, two consecutive short pulse sequences can be further set to indicate the acquisition of flow data, one long pulse sequence can be set to indicate the acquisition of formation pressure data, etc. The specific coding rules and corresponding indication contents can be formulated by the user in the process of implementing the present invention.

[0039] Furthermore, the intelligent wave code injection data transmission method proposed in the present invention also includes the step of transmitting target injection flow rate data from the surface to the well.

[0040] Optionally, as an implementation method, when implementing the step of transmitting target injection flow data from the ground to the underground in this embodiment, the control system, based on the configuration of the upper computer, controls the corresponding underground water distributors according to the target injection flow data of each injection layer; the underground detection devices corresponding to each underground water distributor obtain their respective target injection flow data by detecting the flow value.

[0041] For example, using three water distributors as an example, the user sets target injection flow rates for distributors I, II, and III through the host computer's interface. Based on the host computer's configuration, the control system maintains constant flow rates for distributors I, II, and III, respectively, according to each distributor's target injection flow rate. Each distributor is equipped with a downhole detection device, including a flow meter and a pressure gauge, located underground. The downhole flow meter measures the flow rate at each distributor to obtain the target injection flow rate for that distributor.

[0042] It should be noted that when a water distributor has a constant flow, the water nozzles of other water distributors need to be closed to ensure the uniqueness of the data measured by the downhole flow meter of each water distributor.

[0043] It is understandable that after each downhole water distributor obtains its own target injection flow rate data, it also includes:

[0044] Adjust the water nozzle opening of each downhole water distributor so that the flow value of each downhole water distributor is within the allowable error range to achieve stratified water injection.

[0045] This embodiment adopts this efficient flow data transmission method of constant flow at one end and detection at the other end, which avoids repeatedly opening and closing the water nozzle of the underground water distributor to encode and transmit the value, saving transmission time.

[0046] Furthermore, the intelligent wave code injection data transmission method proposed in the present invention also includes a data recording step. Specifically, during the stratified water injection process of the intelligent wave code injection system, each downhole water distributor uses a downhole detection device to regularly record the flow rate data and formation pressure data of each layer.

[0047] For example, flowmeters and pressure gauges installed at each layer downhole can record flow rate and formation pressure data every hour and be configured to transmit this data upward every hour. When the set time expires, a command to obtain flow or pressure data is transmitted from the surface to the downhole water distributor, which then uploads the recorded data in a pre-set order.

[0048] Furthermore, when implementing the step of transmitting data from underground to the ground, in response to the received instruction sequence indicating the acquisition of flow data, the downhole water distributor corresponding to each injection layer uses the most recently recorded flow data as the target value to be transmitted, and based on the respective target values, the constant flow is sequentially maintained in a preset order; the ground detection device uses a flow meter to detect the constant flow value, thereby obtaining the flow data transmitted underground.

[0049] During this process, the ground directly reads data through a flow meter to obtain the flow value transmitted from the well, without the need to transmit the value through coding, which greatly shortens the data transmission time.

[0050] Furthermore, the formation pressure data to be transmitted can also be transmitted using a constant flow method using a water distributor. Specifically, when transmitting data from downhole to the surface, in response to a received instruction sequence indicating the acquisition of formation pressure data, the downhole water distributor corresponding to each injection layer uses the most recently recorded formation pressure data as the target value to be transmitted, and sequentially generates a constant flow based on the respective target values ​​in a preset order. The surface detection device uses a flow meter to detect the constant flow value, thereby obtaining the formation pressure data transmitted from downhole.

[0051] It is understandable that when implementing the step of transmitting data from underground to the surface, before each underground water distributor maintains a constant flow, the water nozzles of other underground water distributors need to be closed first to ensure data uniqueness.

[0052] The method of constant current output at one end and direct detection at the other end provided in this embodiment can directly read the physical quantity to be transmitted. Compared with traditional wave code communication, this method converts the data encoding process into physical parameter synchronization between devices, significantly improving transmission efficiency and system reliability.

[0053] Optionally, in another embodiment of the present invention, for the step of transmitting formation pressure data from the downhole to the surface, the present invention also provides another implementation method, namely, a pressure joint measurement algorithm. This method is based on the principle of communicating vessel pressure transmission and superposition, and uses a liquid column pressure compensation formula to obtain corresponding formation pressure data, wherein the liquid column pressure compensation formula is:

[0054] P formation = P test + P liquid column = P test + ρgh;

[0055] Where P formation represents the formation pressure data to be obtained, P detection is the data detected by the surface pressure gauge, P liquid column represents the pressure of the liquid column, ρ is the fluid density, g is the acceleration of gravity, and h is the height of the liquid column.

[0056] Specifically, when implementing the step of transmitting data from underground to the ground, in response to the received instruction sequence indicating the acquisition of formation pressure data, the downhole water distributors corresponding to each water injection layer open the water nozzles in sequence according to a preset order to connect with the formation, and close the water nozzles of other downhole water distributors when the water nozzle of each downhole water distributor is opened; the ground detection device uses a pressure gauge to detect the pressure value, and adds it to the pressure of the liquid injection to obtain the formation pressure data transmitted from underground.

[0057] During this process, data is directly read on the ground through a pressure gauge, and the superimposed liquid column pressure is the formation pressure of the corresponding layer. There is no need to repeatedly open and close the water nozzle of the downhole water distributor to encode and transmit the numerical value, which improves data transmission efficiency and greatly shortens data transmission time.

[0058] It should be noted that in the process of transmitting formation pressure data from the underground to the ground, the water injection valve needs to be closed on the ground, and a time gap for normal water injection needs to be reserved before obtaining pressure data of different injection layers.

[0059] Furthermore, the flow meter and pressure gauge on the ground are also connected to the control system through data cables. After obtaining the flow data and pressure data, the data can be transmitted back to the control system in real time. The control system processes the data and transmits it to the host computer. The host computer stores the test data and generates reports.

[0060] In summary, the implementation process of the intelligent wave code splitting data transmission method provided by the present invention in the intelligent wave code splitting system can be generally described as follows:

[0061] 1. The user configures the key parameters of the intelligent wave code injection system and the intelligent wave code injection data transmission method through the operation interface of the host computer, such as the target injection flow data of each injection layer, instruction coding rules, detection interval of the downhole detection device, data upload time interval, data upload sequence of each water distributor, etc. The downhole tools of the intelligent wave code injection system are configured according to Figure 1 The sequence shown is connected in series with the tubing and lowered into the well in sequence;

[0062] 2. Transmit target injection flow data from the surface to the well to achieve stratified water injection. Target injection flow data is transmitted using the method of constant flow distribution on the surface and flow value detected in the well, without the need for data encoding.

[0063] 3. During the stratified water injection process, the downhole water distributor uses the downhole detection device to regularly record the flow data and formation pressure data of each layer;

[0064] 4. The surface opens and closes the wellhead regulating valve according to the preset coding rules to form regular pressure changes, thereby sending a command sequence to the downhole water distributor;

[0065] 5. After receiving the instruction, the downhole water distributor will sequentially provide a constant flow according to the value to be transmitted, or open the water nozzle of a single downhole water distributor to enable the ground detection device to detect the value and thus transmit the data.

[0066] The present invention provides an intelligent wave code injection data transmission method. When transmitting instructions from the ground to the underground, the control system of the ground part, based on the configuration of the upper computer, switches the wellhead regulating valve according to the preset coding rules to form a regular pressure change, thereby sending a command sequence to the underground water distributor; when transmitting data from the underground to the ground, in response to receiving the command sequence, the underground water distributor corresponding to each injection layer, based on the instructions of the command sequence, sequentially maintains a constant flow according to the value to be transmitted, or opens the water nozzle of a single underground water distributor, so that the ground detection device detects the value, thereby obtaining the data transmitted from the underground. This method realizes data transmission through the mode of single-layer constant flow or opening the water nozzle and ground detection. There is no need to encode and transmit the value by repeatedly switching the water nozzle of the underground water distributor, which eliminates the data encoding link, greatly saves data transmission time, and improves data transmission efficiency. In addition, this method is simple and easy to implement, does not require complex wellhead operations and supporting tools, and reduces operating costs.

[0067] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. An intelligent wave code splitting data transmission method, characterized in that: The method is applied to an intelligent wave code injection system, which includes a host computer, a surface part, and multiple downhole water distributors; the host computer is used to provide an operation interface for interaction with users and store test data to generate reports; the surface part includes a control system, a wellhead regulating valve, and a surface detection device; multiple downhole water distributors are arranged on the oil pipe and correspond to each water injection layer, and adjacent water injection layers are separated by packers; each downhole water distributor includes a downhole detection device and a water nozzle; The method comprises the steps of transmitting instructions from the surface to the downhole and transmitting data from the downhole to the surface; wherein the data comprises flow data and formation pressure data; When implementing the step of transmitting instructions from the surface to the downhole, the control system, based on the configuration of the host computer, switches the wellhead regulating valve according to a preset coding rule to form a regular pressure change, thereby sending a command sequence to the downhole water distributor; When implementing the step of transmitting data from the downhole to the surface, in response to receiving the instruction sequence, the downhole water distributor corresponding to each water injection layer sequentially provides a constant flow according to the value to be transmitted based on the instruction of the instruction sequence, or opens the water nozzle of a single downhole water distributor, so that the surface detection device detects the value, thereby obtaining the data transmitted from the downhole; Among them, when implementing the step of transmitting data from underground to the ground, in response to the received instruction sequence indicating the acquisition of formation pressure data, the downhole water distributors corresponding to each water injection layer open the water nozzles in sequence according to a preset order to connect with the formation, and close the water nozzles of other downhole water distributors when the water nozzle of each downhole water distributor is opened; the ground detection device uses a pressure gauge to detect the pressure value, and adds it to the pressure of the liquid injection to obtain the formation pressure data transmitted underground.

2. The intelligent wave code injection data transmission method according to claim 1 is characterized in that: When implementing the step of transmitting instructions from the ground to the underground, the control system switches the wellhead regulating valve based on the configuration of the upper computer, specifically according to the rules of binary coding or pulse width modulation, to form regular pressure changes, thereby sending different instruction sequences to the underground water distributor.

3. The intelligent wave code injection data transmission method according to claim 1 is characterized in that: The method further comprises the step of transmitting target injection flow rate data from the surface to the downhole; When implementing the step of transmitting the target injection flow data from the ground to the underground, the control system, based on the configuration of the upper computer, controls the corresponding underground water distributor according to the target injection flow data of each water injection layer; the underground detection device corresponding to each underground water distributor obtains its own target injection flow data by detecting the flow value.

4. The intelligent wave code splitting data transmission method according to claim 3 is characterized in that: When each downhole water distributor obtains its own target injection flow data, it also includes: Adjust the water nozzle opening of each downhole water distributor so that the flow value of each downhole water distributor is within the allowable error range to achieve stratified water injection.

5. The intelligent wave code splitting data transmission method according to claim 4 is characterized in that: The method further comprises a data recording step, wherein the data recording step specifically comprises: During the process of stratified water injection by the intelligent wave code injection system, each downhole water distributor uses a downhole detection device to regularly record the flow data and formation pressure data of each layer.

6. The intelligent wave code splitting data transmission method according to claim 5 is characterized in that: When implementing the step of transmitting data from underground to the ground, in response to the received instruction sequence indicating the acquisition of flow data, the downhole water distributor corresponding to each water injection layer uses the most recently recorded flow data as the target value to be transmitted, and based on the respective target values, the constant flow is sequentially maintained in a preset order; the ground detection device uses a flow meter to detect the constant flow value, thereby obtaining the flow data transmitted underground.

7. The intelligent wave code splitting data transmission method according to claim 5 is characterized in that: When implementing the step of transmitting data from underground to the ground, in response to the received instruction sequence indicating the acquisition of formation pressure data, the downhole water distributor corresponding to each water injection layer uses the most recently recorded formation pressure data as the target value to be transmitted, and based on the respective target values, a constant flow is sequentially maintained in a preset order; the ground detection device uses a flow meter to detect the constant flow value, thereby obtaining the formation pressure data transmitted underground.

8. An intelligent wave code splitting data transmission method according to claim 6 or 7, characterized in that: When implementing the step of transmitting data from underground to the surface, before each underground water distributor maintains a constant flow, the water nozzles of other underground water distributors need to be closed first.

9. The intelligent wave code injection data transmission method according to claim 1, characterized in that: In the process of transmitting formation pressure data from underground to the ground, the water injection valve needs to be closed on the ground, and a time gap for normal water injection needs to be reserved before obtaining pressure data of different injection layers.

Images