Electrically-controlled segmented testing system for liquid producing layer and control method of electrically-controlled segmented testing system

Abstract

The invention provides a liquid producing layer electronic control segmented test system and a control method thereof. The system comprises a ground control device; the instrument string is connected with the ground control device through a communication cable; the instrument string comprises a data communication short section, and the data communication short section is connected with the ground control device through a communication cable; the tension testing short section is used for testing tension data borne by the communication cable; the depth testing short section is used for measuring depth data of the instrument string in the oil well; the first electric control packer is used for packing or unpacking a liquid producing layer of the oil well casing; the liquid producing layer testing device is used for collecting underground parameter data of the subsection layer position packed by the first electric control packer in the oil well; and the releasing short section is used for controlling the releasing short section to release the first electric control packer and the liquid production layer testing device when the instrument string is blocked or stuck in the oil well casing. According to the scheme, accurate testing of different stratums can be achieved through segmented testing of the liquid producing layer.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield liquid production layer testing, and in particular relates to a liquid production layer electric control segmented testing system and a control method thereof. Background Art

[0002] With the continuous exploitation of crude oil, the proportion of produced water will increase. In order to improve the efficiency of crude oil exploitation, it is necessary to test the liquid-producing layer of the oil well, that is, to dynamically monitor the oil and water production, formation pressure, temperature and other data, so as to accurately evaluate the oil layer information and formulate reasonable production increase measures.

[0003] In recent years, horizontal well mining technology has developed rapidly. Since horizontal wells remain horizontal to the oil layer, the water content of the produced fluid may be higher, resulting in a higher risk of reduced production capacity. Therefore, testing the producing layer becomes more important.

[0004] As crude oil production deepens, higher requirements are placed on production fluid testing technology. It is necessary to test the production layer step by step in order to accurately understand the oil layer information. Therefore, segmented testing technology came into being. The key to segmented testing is to use packers to achieve reliable isolation of each production layer segment to prevent inter-layer crosstalk during the test, thereby affecting the accuracy of the test results. At present, most packers are implemented by electric control, but most of them have unreliable sealing and unsealing, resulting in inaccurate test data of the production layer. Summary of the invention

[0005] The purpose of the embodiments of this specification is to provide a liquid-producing layer electrically controlled segmented testing system and a control method thereof.

[0006] To solve the above technical problems, the embodiments of the present application are implemented in the following ways: In a first aspect, the present application provides a liquid production layer electric control segmented testing system, the system comprising: Ground control unit; An instrument string, which is connected to a ground control device via a communication cable; The instrument string includes: A data communication short section, wherein the data communication short section is connected to a ground control device via a communication cable; data of the data communication short section is sent to the ground control device via the communication cable; A tension test short section is used to test the tension data of the communication cable and send the tension data to the data communication short section; Depth test sub, used to measure the depth data of the instrument string in the oil well and send the depth data to the data communication sub; The first electrically controlled packer is used to isolate or release the liquid producing layer of the oil well casing; The production layer testing device is used to collect downhole parameter data of the segmented layer isolated by the first electric-controlled packer in the oil well, and send the downhole parameter data to the data communication sub; The release nipple is used to control the ground control device to release the first electric-controlled packer and the liquid-producing layer testing device when the instrument string encounters resistance or is stuck in the oil well casing.

[0007] In one embodiment, the instrument string further comprises: The cable head is respectively connected with the communication cable and the data communication short section.

[0008] In one of the embodiments, the instrument string further comprises: a second electrically controlled packer; The first electrically-controlled packer and the second electrically-controlled packer form a completely independent testing environment for the liquid-producing layer testing device.

[0009] In one embodiment, the cable head, data communication short section, tension test short section, depth test short section, release short section, first electric-controlled packer, liquid-producing layer testing device, and second electric-controlled packer in the instrument string are fixedly connected in sequence.

[0010] In one embodiment, the instrument string further comprises: Flexible nipple, used to improve the passability of instrument string in oil well casing; The flexible short section is arranged between the cable head and the data communication short section.

[0011] In one embodiment, the ground control device is connected to a host computer to send received data to the host computer and receive control instructions sent by the host computer.

[0012] In a second aspect, the present application provides a control method for the liquid production layer electric control segmented testing system according to the first aspect, the method comprising: The instrument string is lowered into the test oil well through the communication cable. During the lowering process, the tension test sub measures the lowering tension of the communication cable in real time and sends it to the data communication sub. The depth test sub measures the lowering depth of the instrument string in the oil well in real time and sends it to the data communication sub. The data communication sub sends the lowering tension and lowering depth to the ground control device through the data communication sub; The ground control device determines whether the lowering tension is within the preset range. If not, an early warning is issued; if the lowering tension reaches the limit tension, the release nipple is controlled to release the first electric-controlled packer, the liquid-producing layer testing device and the second electric-controlled packer; If it is within the preset range, and the ground control device determines that the lowering depth reaches the preset depth, the ground control device sends a setting instruction to the first electric-controlled packer and the second electric-controlled packer through the data communication nipple, and sends a test instruction to the liquid-producing layer test device; After receiving the test instruction, the liquid production layer test device performs parameter test on the liquid production layer, obtains downhole parameter data, and sends the downhole parameter data to the data communication short section; The tension test sub measures the real-time tension of the communication cable in real time and sends it to the data communication sub. The depth test sub measures the real-time depth of the instrument string in the oil well in real time and sends it to the data communication sub. The data communication sub integrates the received downhole parameter data, real-time tension, and real-time depth into a data packet, and sends the data packet to the ground control device at a preset frequency and preset intensity.

[0013] In one embodiment, the data packet includes a plurality of small data packets, and the small data packets include an instrument fixed number, data length, short section data and data check.

[0014] In one of the embodiments, if the ground control device determines that the sealing of the first electrically-controlled packer and the second electrically-controlled packer is unreliable, a sealing instruction is resent to the first electrically-controlled packer and the second electrically-controlled packer to reseal the first electrically-controlled packer and the second electrically-controlled packer until the sealing of the first electrically-controlled packer and the second electrically-controlled packer is reliable.

[0015] In one of the embodiments, if the ground control device determines that the downhole parameter data does not meet the test requirements, the parameter test is re-performed on the liquid production layer of the segmented layer corresponding to the preset depth until the downhole parameter data meets the test requirements.

[0016] It can be seen from the technical solution provided in the above embodiments of this specification that: Use the tension test nipple to collect and transmit the pressure or tension data of the communication cable and instrument string in real time, ensuring the safety of the entire test system and reducing the risk of the instrument string encountering obstruction or jamming.

[0017] Compared with other production layer testing systems, the system adds an electrically controlled packer to test the production layer in sections and accurately monitor each layer, providing accurate data basis and foundation for evaluating oil layer information.

[0018] Compared with other production layer test systems, the electric-controlled packer setting process data and production layer test data are sent to the ground control device in real time, and the data is analyzed by the host computer software. When the electric-controlled packer is unreliable or the production layer test result is not ideal, repeated operation and measurement are performed to ensure the reliability of the electric-controlled packer setting and unsealing, and at the same time ensure the validity and accuracy of the production layer test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the structure of the electric-controlled segmented testing system for the liquid-producing layer provided in this application applied in a vertical well; Figure 2 This is a schematic diagram of the structure of the liquid-producing layer electrically controlled segmented testing system provided in this application applied to a horizontal well. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0022] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0023] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present application description without departing from the scope or spirit of the present application. Other embodiments derived from the present application description will be apparent to those skilled in the art. The present application description and examples are merely exemplary.

[0024] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0025] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0026] Reference Figure 1 and Figure 2, which shows a schematic diagram of the structure of the liquid production layer electric control segmented testing system applicable to the embodiment of the present application. Figure 1 This is a schematic diagram of the application of the electric control segmented test system for the liquid production layer in a vertical well. Figure 2 This is a schematic diagram of the application of the electric-controlled segmented testing system for the liquid-producing layer in a horizontal well.

[0027] like Figure 1 and Figure 2 As shown, a liquid-producing layer electric-controlled segmented testing system may include: Ground control unit 1; An instrument string 2, the instrument string 2 is connected to the ground control device 1 via a communication cable 3; Instrument string 2 includes: A data communication short section 21, the data communication short section 21 is connected to the ground control device 1 via a communication cable 3; the data of the data communication short section 21 is sent to the ground control device 1 via the communication cable 3; The tension test short section 22 is used to test the tension data of the communication cable 3 and send the tension data to the data communication short section 21; A depth test sub 23 is used to measure the depth data of the instrument string 2 in the oil well and send the depth data to the data communication sub 21; The first electrically controlled packer 24 is used to isolate or release the liquid producing layer of the oil well casing; The liquid production layer testing device 25 is used to collect downhole parameter data of the segmented layer isolated by the first electric control packer 24 in the oil well, and send the downhole parameter data to the data communication sub 21; The release nipple 26 is used to control the ground control device 1 to release the first electric-controlled packer 24 and the liquid-producing layer testing device 25 when the instrument string 2 encounters resistance or gets stuck in the oil well casing.

[0028] Among them, instrument string 2 also includes: The cable head 27 is connected to the communication cable 3 and the data communication short section 21 respectively.

[0029] The instrument string 2 further includes: a second electrically controlled packer 28; The first electrically controlled packer 24 and the second electrically controlled packer 28 form a completely independent testing environment for the liquid producing layer testing device 25 .

[0030] The cable head 27, the data communication short section 21, the tension test short section 22, the depth test short section 23, the release short section 26, the first electric-controlled packer 24, the liquid-producing layer testing device 25, and the second electric-controlled packer 28 in the instrument string 2 are fixedly connected in sequence.

[0031] Specifically, during the process of lifting or lowering the instrument string 2, the tension test short section 22 uses a sensor to test the tension data of the communication cable 3 in real time, wherein the tension data includes pressure or tension, providing a data basis for the safe construction of the instrument string 2; and the pressure or tension obtained from the real-time test is sent to the data communication short section 21, providing reliable safety warning and protection for the entire system.

[0032] The depth test sub 23 measures the depth of the instrument string 2 in the oil well, including but not limited to magnetic positioning, gamma, etc. The measured depth can be used as the depth basis for segmented testing of the liquid-producing layer; and the depth data is sent to the data communication sub 21.

[0033] The production layer testing device 25 collects downhole parameter data of each segmented layer, which may include flow rate, water content, temperature, pressure, density, etc. of the production layer, and sends the collected downhole parameter data to the data communication sub 21. It can be understood that the requirements for different downhole parameter data of the production layer can be achieved by configuring different types of instrument combinations.

[0034] The ground control device 1 is connected to the data communication short section 21 through a communication cable 3, and the data received by the data communication short section 21 is sent to the ground control device 1, and the ground control device 1 sends the received data to the host computer to be presented on the host computer. In addition, the ground control device 1 also receives control instructions sent by the host computer. That is, the ground control device 1 integrates data reception and the issuance of host computer control commands. Specifically: the ground control device 1 parses the data sent by the data communication short section 21 after receiving it, and displays it on the host computer, wherein the received data is displayed one by one according to the instrument type classification, and whether the data needs to be displayed can be set by the host computer software; at the same time, the host computer software can send control commands downward, and the issuance of control commands is the same as data analysis, which is distinguished by instrument type.

[0035] It can be understood that after the data communication sub 21 receives the instrument string data sent by the tension test sub 22, the depth test sub 23, and the liquid production layer test device 25, the instrument string data is integrated and sent to the ground control device 1. In addition, the data communication sub 21 receives the control command issued by the upper computer software through the ground control device 1. Among them, the instrument string data is integrated into a data packet, which contains the instrument fixed number, data length, sub data and data verification. The instrument fixed number is used to distinguish the instrument type; the data length is the data length of this type of instrument; the sub data is the corresponding sub acquisition measurement data, for example, the sub data corresponding to the tension test sub is tension data, the sub data corresponding to the depth test sub is depth data, and the sub data corresponding to the liquid production layer test device is downhole parameter data; the data verification verifies the accuracy of this type of instrument data. The command issued by the upper computer software is the same as the instrument string data sent upward, and it also distinguishes the commands of different types of instruments by the instrument fixed number. The instrument string data sent upward and the command sent downward eliminate the signal interference between each other through different signal transmission methods and data baud rates.

[0036] The drop-down short section 26 is the ultimate guarantee measure for the entire test system. When the instrument string 2 encounters an obstruction or is stuck in the well, the instruments hung below the short section, including the first electric-controlled packer 24, the liquid-producing layer testing device 25, and the second electric-controlled packer 28, can be dropped and then salvaged using a salvage tool, thereby reducing the operational risks caused by obstruction or well jamming.

[0037] The first electric-controlled packer 24 and the second electric-controlled packer 28 use motor drive to isolate the production layer of the oil well casing, creating a relatively independent test layer for the production layer test device 25, so as to achieve the purpose of accurately testing the data of different production layers. In order to ensure the independence of each layer, two upper and lower packers, namely the first electric-controlled packer 24 and the second electric-controlled packer 28, are generally configured to form a completely independent testing environment. After the first electric-controlled packer 24 and the second electric-controlled packer 28 are set, the production layer test device 25 collects the downhole parameter data of the segmented layer, and the collected downhole parameter data is uploaded to the ground control device 1 through the data communication short section 21; after the downhole parameter data of the current segmented layer is collected, the first electric-controlled packer 24 and the second electric-controlled packer 28 are unsealed, and the instrument string 2 is lifted or lowered to the next segmented layer for the next test.

[0038] In one embodiment, the instrument string 2 further includes: A flexible nipple 29, used to improve the passability of the instrument string 2 in the oil well casing; The flexible short section 29 is disposed between the cable head 27 and the data communication short section 21 .

[0039] Specifically, the flexible nipple 29 is to improve the passability of the instrument string 2 in the oil well casing and reduce the risk of encountering resistance or sticking, which is very necessary especially in horizontal well applications.

[0040] When the electric-controlled segmented testing system for the liquid-producing layer provided in the above embodiment is used in a vertical well, a common oil pipe 4 can be lowered into the well together with the casing. When used in a horizontal well, in order to improve the passability of the instrument string, the oil pipe 4 needs to use a continuous oil pipe, and the instrument string is lowered into the well in the continuous oil pipe.

[0041] The working process and principle of the liquid production layer electrically controlled segmented testing system provided in the above embodiment are specifically described.

[0042] The instrument string 2 is connected to the ground control device 1 through a communication cable 3, and according to the depth of the instrument string 2 in the oil well measured by the depth test short section 23, after the instrument string 2 is lowered to the test liquid production layer, the host computer sends a sealing command, which is sent to the electric control packer, including the first electric control packer 24 and the second electric control packer 28, through the ground control device 1 and the data communication short section 21. After the electric control packer successfully receives the sealing command, it starts the sealing action and monitors the sealing process. If the sealing is unreliable, it is necessary to resend the command to complete the sealing. After the sealing is completed, the production fluid will be collected and flowed into the liquid production layer test device 25. When passing through the liquid production layer test device 25, the relevant parameters are collected and measured, and then flow out through the upper liquid hole of the electric control packer to the instrument and the oil pipe annulus.

[0043] After completing the test of the current segmented layer, the host computer sends an unsealing command to unseal the electric-controlled packer. Lift or lower instrument string 2 to the next test layer, and repeat the electric-controlled packer setting, liquid-producing layer testing, and electric-controlled packer unsealing operations. After multiple-layer segmented tests, the liquid-producing layer segmented test is completed, thereby obtaining dynamic liquid production data for each segmented layer.

[0044] During the test, the data can be presented in real time on the host computer, so the electric control packer setting effect and the test data of the liquid production layer can be preliminarily analyzed. If the test effect of the current test layer is not ideal, the measurement can be repeated until the current test layer data is tested completely and accurately. After all the segmented layer tests are completed, the instrument string 2 can be lifted up to the wellhead.

[0045] During the process of lifting or lowering the instrument string 2, the pressure or tension value of the communication cable 3 can be monitored in real time through the tension test short section 22, so as to provide safety warning and evaluation for the entire construction process. Once the instrument string 2 is stuck during the construction process, the instrument string 2 can be lifted up according to the situation to disengage the hand release tool, and the stuck instrument string 2 can be released, and then it can be salvaged out of the well by the salvage tool, thereby reducing the operation risk.

[0046] The electric-controlled segmented testing system for the liquid-producing layer provided in the embodiment of the present application can be applied to horizontal wells. It is necessary to add a flexible short section to improve the passability of the instrument string in the horizontal well and reduce the risk of encountering obstruction or jamming.

[0047] Compared with other liquid-producing layer testing systems, the electrically-controlled segmented testing system for the liquid-producing layer provided in the embodiment of the present application adds an electrically-controlled packer to perform segmented testing on the liquid-producing layer and accurately monitor each segmented layer, thereby providing accurate data basis and foundation for evaluating oil layer information.

[0048] Compared with other production layer test systems, the electric-controlled segmented test system for the production layer provided in the embodiment of the present application sends the setting process data of the electric-controlled packer and the test data of the production layer to the ground control device in real time, and performs data analysis through the host computer software. When the setting of the electric-controlled packer is unreliable or the test result of the production layer is not ideal, repeated operations and measurements are performed to ensure the reliability of the setting and unsealing of the electric-controlled packer, and at the same time ensure the validity and accuracy of the test data of the production layer.

[0049] The liquid-producing layer electrically controlled segmented testing system provided in the embodiment of the present application uses a tension test pup section to collect and transmit the pressure or tension data exerted on the communication cable and the instrument string in real time, thereby ensuring the safety of the entire testing system and reducing the risk of the instrument string encountering obstruction or jamming.

[0050] The present application also provides a control method for the liquid production layer electric control segmented test system provided by the above embodiment, the method comprising: The instrument string 2 is lowered into the test oil well through the communication cable 3. During the lowering process, the tension test sub 22 measures the lowering tension of the communication cable 3 in real time and sends it to the data communication sub 21. The depth test sub 23 measures the lowering depth of the instrument string 2 in the oil well in real time and sends it to the data communication sub 21. The data communication sub 21 sends the lowering tension and the lowering depth to the ground control device 1 through the data communication sub 21 .

[0051] Specifically, the instrument string 2 is fixedly connected in sequence according to the cable head 27, the data communication short section 21, the tension test short section 22, the depth test short section 23, the hand-release short section 26, the first electric-controlled packer 24, the liquid-producing layer test device 25, and the second electric-controlled packer 28, and then the data communication short section 21 and the ground control device 1 are connected through the communication cable 3. It can be understood that if the instrument string 2 also includes a flexible short section 29, the instrument string 2 is fixedly connected in sequence according to the cable head 27, the flexible short section 29, the data communication short section 21, the tension test short section 22, the depth test short section 23, the hand-release short section 26, the first electric-controlled packer 24, the liquid-producing layer test device 25, and the second electric-controlled packer 28, and then the cable head 27 and the ground control device 1 are connected through the communication cable 3.

[0052] After the connection is completed, the instrument string 2 is lowered into the test oil well through the communication cable 3. During the lowering process, the tension test sub 22 and the depth test sub 23 respectively test the lowering tension of the communication cable 3 and the lowering depth of the instrument string 2 in real time, and send the real-time monitored data to the ground control device 1 through the data communication sub 21. If the ground control device 1 is also connected to the host computer, the received data is uploaded to the host computer and presented on the host computer.

[0053] The ground control device 1 determines whether the lowering tension is within a preset range. If not, an early warning is issued. If the lowering tension reaches the limit tension, the release nipple 26 is controlled to release the first electric-controlled packer 24, the liquid-producing layer testing device 25 and the second electric-controlled packer 28. If it is within the preset range and the ground control device 1 determines that the lowering depth reaches the preset depth, the ground control device 1 sends a setting instruction to the first electric-controlled packer 24 and the second electric-controlled packer 28 through the data communication short section 21, and sends a test instruction to the liquid-producing layer testing device 25.

[0054] Specifically, the ground control device 1 determines whether the lowering tension is within a preset range or reaches the limit tension. If the ground control device 1 is connected to a host computer, the host computer can also determine whether the lowering tension is within a preset range or reaches the limit tension. The preset range can be set according to actual conditions. The limit tension is the tension value when the instrument string encounters resistance or jams, and the communication cable is pulled apart in extreme cases.

[0055] If the lowering tension is not within the preset range, an early warning can be issued, and the ground operator can take dangerous measures according to the received lowering tension. If the lowering tension reaches the limit tension, the ground control device 1 or the host computer sends a release command to the release sub 26 through the data communication sub 21 to control the release sub 26 to release the first electric control packer 24, the liquid production layer testing device 25 and the second electric control packer 28.

[0056] If the lowering tension is within the preset range, in order to conduct segmented testing of the liquid-producing layer, a relatively independent segmented testing environment of the liquid-producing layer is isolated by using the first electric-controlled packer 24 and the second electric-controlled packer 28. That is, when the lowering depth reaches the preset depth, the ground control device 1 sends a setting instruction to the first electric-controlled packer 24 and the second electric-controlled packer 28 through the data communication nipple 21, and sends a test instruction to the liquid-producing layer testing device 25. Among them, the preset depth is the depth of several segmented layers set according to the situation.

[0057] The upper computer sends a setting command to the ground control device 1, and the ground control device 1 converts the received setting command into a signal of fixed frequency and intensity, and sends it to the data communication sub 21 through the communication cable 3. The data communication sub 21 then sends the setting command to the first electric-controlled packer 24 and the second electric-controlled packer 28. After receiving the setting command, the first electric-controlled packer 24 and the second electric-controlled packer 28 start the setting action. It can be understood that after the first electric-controlled packer 24 and the second electric-controlled packer 28 are set, the setting process will be monitored. If the setting is unreliable, it is necessary to resend the setting command to re-set until the setting is reliable.

[0058] After receiving the test instruction, the liquid production layer testing device 25 performs parameter test on the liquid production layer, obtains downhole parameter data, and sends the downhole parameter data to the data communication sub 21; The tension test sub 22 tests the real-time tension of the communication cable 3 in real time and sends it to the data communication sub 21. The depth test sub 23 measures the real-time depth of the instrument string 2 in the oil well in real time and sends it to the data communication sub 21. The data communication sub 21 integrates the received downhole parameter data, real-time tension, and real-time depth into a data packet, and sends the data packet to the surface control device 1 at a preset frequency and preset intensity.

[0059] Specifically, when the first electric-controlled packer 24 and the second electric-controlled packer 28 are set, the produced fluid will be collected and flowed into the production layer test device 25, and the production layer test device 25 performs downhole parameter data testing on the current production layer, wherein the downhole parameter data includes the flow rate, water content, temperature, pipe pressure, pipe pressure, etc. of the oil well. The downhole parameter data is sent to the data communication short section 21 in real time. In addition, the tension test short section 22 of the current production layer tests the real-time tension of the communication cable 3 in real time, and the depth test short section 23 measures the real-time depth of the instrument string 2 in the current production layer in real time. The real-time tension and real-time depth are also sent to the data communication short section 21 in real time. The data communication short section 21 integrates the received downhole parameter data, real-time tension, and real-time depth into a data packet. Among them, the data packet is composed of several independent small data packets, and each small data packet contains the fixed instrument number, data length, short section data and data verification. Among them, the short section data includes downhole parameter data, real-time tension, real-time depth and other data. For example, the format of the small data packet corresponding to the liquid production layer testing device 25 is instrument fixed number, data length, downhole parameter data, and data verification, and the formats of other small data packets are similar.

[0060] The data communication sub 21 sends the data packet to the ground control device 1 at a preset frequency and preset strength, wherein the preset frequency and preset strength can be set according to actual needs. The ground control device 1 can send the received data packet to the host computer, which can analyze the data packet. If it is determined that the test data of the data packet does not meet the test requirements, the current liquid production layer can be retested until the test results meet the requirements.

[0061] After the downhole parameter data of the current liquid-producing layer meets the test requirements, the upper computer sends an unsealing instruction to unseal the first electric-controlled packer 24 and the second electric-controlled packer 28, lift or lower the instrument string 2 to the next preset depth, and repeat the first electric-controlled packer 24 and the second electric-controlled packer 28 setting, liquid-producing layer testing, and unsealing operations of the first electric-controlled packer 24 and the second electric-controlled packer 28. When all segmented layer tests are completed, the segmented test of the liquid-producing layer is completed, so as to obtain the dynamic liquid production data of each segmented layer, and the instrument string 2 can be lifted up to the wellhead through the communication cable 3.

[0062] In one embodiment, if the ground control device 1 determines that the sealing of the first electrically-controlled packer 24 and the second electrically-controlled packer 28 is unreliable, a sealing instruction is resent to the first electrically-controlled packer 24 and the second electrically-controlled packer 28 to reseal the first electrically-controlled packer 24 and the second electrically-controlled packer 28 until the sealing of the first electrically-controlled packer 24 and the second electrically-controlled packer 28 is reliable.

[0063] In one embodiment, if the ground control device 1 determines that the downhole parameter data does not meet the test requirements, the parameter test is re-performed on the liquid production layer of the segmented layer corresponding to the preset depth until the downhole parameter data meets the test requirements.

[0064] During the above-mentioned test process, the data can be presented in real time on the host computer, so as to determine whether the sealing of the first electrically-controlled packer 24 and the second electrically-controlled packer 28 is reliable. When the sealing of the first electrically-controlled packer 24 and the second electrically-controlled packer 28 is reliable, data testing and collection are performed on the liquid-producing layer, and a preliminary analysis of the test data of the liquid-producing layer is performed in real time, so that when the test effect of the current test layer is not ideal, the test can be repeated until the test data of the current test layer is tested completely and accurately.

[0065] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0066] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

Claims

1. A liquid production layer electronically controlled segmented testing system, characterized in that: The system comprises: Ground control unit (1); An instrument string (2), the instrument string (2) being connected to the ground control device (1) via a communication cable (3); The instrument string (2) comprises: A data communication short section (21), wherein the data communication short section (21) is connected to the ground control device (1) via the communication cable (3); data of the data communication short section (21) is sent to the ground control device (1) via the communication cable (3); A tension test short section (22) for testing the tension data of the communication cable (3) and sending the tension data to the data communication short section (21); A depth test sub (23) for measuring the depth data of the instrument string (2) in the oil well and sending the depth data to the data communication sub (21); A first electrically controlled packer (24) is used to isolate or release the liquid producing layer of the oil well casing; A liquid production layer testing device (25) for collecting downhole parameter data of the segmented layers isolated by the first electrically controlled packer (24) in the oil well, and sending the downhole parameter data to the data communication sub (21); The release nipple (26) is used for controlling the ground control device (1) to release the first electric-controlled packer (24) and the liquid-producing layer testing device (25) when the instrument string (2) encounters resistance or gets stuck in the oil well casing.

2. The system according to claim 1, characterized in that The instrument string (2) further comprises: A cable head (27), the cable head (27) being connected to the communication cable (3) and the data communication short section (21) respectively.

3. The system according to claim 2, characterized in that The instrument string (2) further comprises: a second electrically controlled packer (28); The first electrically controlled packer (24) and the second electrically controlled packer (28) form a completely independent testing environment for the liquid producing layer testing device (25).

4. The system according to claim 3, characterized in that The cable head (27), the data communication short section (21), the tension test short section (22), the depth test short section (23), the release short section (26), the first electrically controlled packer (24), the liquid production layer testing device (25), and the second electrically controlled packer (28) in the instrument string (2) are fixedly connected in sequence.

5. The system according to any one of claims 2 to 4, characterized in that: The instrument string (2) further comprises: A flexible short joint (29) for improving the passability of the instrument string (2) in the oil well casing; The flexible short section (29) is arranged between the cable head (27) and the data communication short section (21).

6. The system according to claim 1, characterized in that The ground control device (1) is connected to a host computer to send received data to the host computer and to receive control instructions sent by the host computer.

7. A control method using the liquid production layer electric control segmented test system according to any one of claims 1 to 6, characterized in that: The method comprises: The instrument string is lowered into the test oil well through the communication cable. During the lowering process, the tension test sub measures the lowering tension of the communication cable in real time and sends it to the data communication sub. The depth test sub measures the lowering depth of the instrument string in the oil well in real time and sends it to the data communication sub. The data communication sub sends the lowering tension and the lowering depth to the ground control device via the data communication sub; The ground control device determines whether the lowering tension is within a preset range, and issues an early warning if it is not within the preset range; if the lowering tension reaches the limit tension, the ground control device controls the release pup joint to release the first electric-controlled packer, the liquid-producing layer testing device, and the second electric-controlled packer; If it is within the preset range, and the surface control device determines that the lowering depth reaches the preset depth, the surface control device sends a setting instruction to the first electric-controlled packer and the second electric-controlled packer through the data communication nipple, and sends a test instruction to the liquid-producing layer test device; After receiving the test instruction, the liquid production layer test device performs parameter test on the liquid production layer to obtain downhole parameter data, and sends the downhole parameter data to the data communication short section; The tension test sub measures the real-time tension of the communication cable in real time and sends it to the data communication sub. The depth test sub measures the real-time depth of the instrument string in the oil well in real time and sends it to the data communication sub. The data communication sub integrates the received downhole parameter data, the real-time tension, and the real-time depth into a data packet, and sends the data packet to the ground control device at a preset frequency and preset strength.

8. The method according to claim 7, characterized in that The data packet includes a plurality of small data packets, and the small data packets include a fixed instrument number, a data length, short section data and a data check.

9. The method according to claim 7, characterized in that: If the ground control device determines that the sealing of the first electrically-controlled packer and the second electrically-controlled packer is unreliable, the sealing instruction is resent to the first electrically-controlled packer and the second electrically-controlled packer to reseal the first electrically-controlled packer and the second electrically-controlled packer until the sealing of the first electrically-controlled packer and the second electrically-controlled packer is reliably achieved.

10. The method according to claim 7, characterized in that If the ground control device determines that the downhole parameter data does not meet the test requirements, the parameter test is re-performed on the liquid production layer of the segmented layer corresponding to the preset depth until the downhole parameter data meets the test requirements.

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