Device for detecting communication performance of wet joint of horizontal well
By designing downhole detection instruments and surface detection and control instruments, and using relay capacitor boards and cable core distribution boards to control the connection and disconnection of the cable core, the high voltage risk during the insulation measurement of logging cable cores was solved, enabling rapid judgment of successful connection and insulation performance measurement, thus ensuring the safe operation of logging.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA NAT PETROLEUM CORP
- Filing Date
- 2024-10-16
- Publication Date
- 2026-04-17
AI Technical Summary
In existing technologies, high voltage electricity needs to be applied when measuring the insulation of the cable core of logging cables, which poses a risk of damaging downhole instruments. Furthermore, there is a lack of methods to test the insulation of the cable core after the male and female connectors have been successfully connected.
A device for testing the continuity performance of wet joints in horizontal wells was designed, including a downhole tester and a surface test controller. The continuity of the cable core is controlled by a relay capacitor board and a cable core distribution board. The surface test controller measures the cable core resistance and insulation resistance, and protects the downhole instrument from high voltage.
It enables rapid identification of male and female connector connections and measurement of electrical path insulation performance, ensuring successful logging, protecting downhole instruments, and providing reliable fault diagnosis.
Smart Images
Figure CN121875692A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of oil well logging and testing equipment, and relates to a testing device for the connection performance of wet joints in horizontal wells. Background Technology
[0002] The horizontal well wet joint logging process involves using a pressurized pump to mechanically connect and lock the female connector with the logging cable and the male connector with the instrument string in the drilling fluid environment. This establishes an electrical connection between the logging cable, the male and female connectors, and the logging instruments, which is then transmitted using drilling tools for logging. The electrical path formed by the logging cable and the male and female connectors is responsible for supplying power to the downhole logging instruments and transmitting logging data. Because the connection is performed in a high-temperature, high-pressure drilling fluid environment, the electrical path has a high failure rate after connection. Whether the entire electrical path is connected and the insulation performance are key factors determining the success of logging. Therefore, rapid measurement of the connection performance is a crucial step in the horizontal well wet joint logging construction.
[0003] Currently, the main method for determining whether the male and female connectors are successfully connected is to connect an ohmmeter in series between the two power supply cable cores at the ground end before connection. Since there is a mode transformer connected in series between the power supply cable cores at the logging instrument end, the success of the male and female connector connection can be determined by observing whether the ohmmeter has a resistance value after connection. However, since high voltage needs to be applied to the logging cable core when measuring the cable core insulation, and the instrument is connected to the lower end of the logging cable, there is a risk of high voltage damaging the instrument. Currently, there is no technical means to test the cable core insulation after the male and female connectors are successfully connected. Summary of the Invention
[0004] The purpose of this invention is to provide a testing device for the continuity performance of wet joints in horizontal wells. This device solves the problems in the prior art, such as the need to apply high voltage to the logging cable core when measuring the cable core insulation, the risk of high voltage damaging the instrument due to the instrument being connected at the lower end of the logging cable, and the lack of technical means to test the cable core insulation after successful male-female joint connection.
[0005] The technical solution adopted in this invention is a detection device for the connection performance of a horizontal well wet connector, comprising a downhole detection instrument and a surface detection and control instrument. The surface detection and control instrument is connected to the upper end of the logging cable, the lower end of the logging cable is connected to the female connector of the horizontal well wet connector tool, the male connector of the horizontal well wet connector tool is connected to the downhole detection instrument, and the other end of the downhole detection instrument is connected to a logging instrument string.
[0006] Preferably, the logging cable is a 7-core cable, including cores 1# to 7#.
[0007] Preferably, the downhole detection instrument includes a housing, with a standard instrument upper connector and a standard instrument lower connector respectively provided at both ends inside the housing. The standard instrument upper connector and the standard instrument lower connector are electrically connected to the male connector of the horizontal well wet connector tool and the logging instrument string, respectively. An instrument frame is provided inside the housing, with both ends of the instrument frame connected to the standard instrument upper connector and the standard instrument lower connector, respectively. A cable core distribution plate, a relay capacitor plate, and a relay power supply plate are installed on the instrument frame. The relay power supply plate is electrically connected to the standard instrument upper connector. The standard instrument upper connector is also electrically connected to the cable core distribution plate, the relay capacitor plate, and the relay power supply plate. The relay power supply plate is electrically connected to the relay capacitor plate and the cable core distribution plate, respectively.
[0008] Preferably, the upper connector of the standard instrument is a 7-pin connector, and the lower connector of the standard instrument is a 7-core connector. The upper ends of pins 1#-7# of the upper connector of the standard instrument are respectively connected to the corresponding cores 1#-7# of the logging cable through the female and male connectors of the horizontal well wet connector tool. The lower ends of pins 1#-4# of the upper connector of the standard instrument are connected to the core distribution plate. The lower ends of pins 5#-7# of the upper connector of the standard instrument are connected to the relay capacitor board. The lower end of pin 7# of the upper connector of the standard instrument is also connected to the relay power board. The lower end of the core corresponding to pin 7# of the upper connector of the standard instrument on the relay capacitor board is connected to the core 7# of the lower connector of the standard instrument.
[0009] Preferably, the ground detection and control instrument includes a housing, inside which are arranged a high-voltage board, a switching power supply, a relay board, and a processing board. The switching power supply converts 220VAC to 12VDC and 24VDC DC power. The switching power supply is electrically connected to the high-voltage board. The high-voltage board is also connected to the relay board and the processing board in sequence. The housing is also provided with a flexible cable, which includes 8 cable cores. One end is connected to the 1#-7# cable cores and the ground wire of the logging cable, and the other end is connected to the input terminal of the relay board. The housing is also provided with an LED display screen, which is connected to the processing board.
[0010] Preferably, the relay board includes a high-voltage shunt circuit. The input terminal of the high-voltage shunt circuit is connected to the high-voltage output terminal of the high-voltage board. The output terminal of the high-voltage shunt circuit is connected to the input terminal of the relay array. The control terminal of each relay in the relay array is connected to the processing board. The output terminal of the relay array is correspondingly connected to the input terminal of the current acquisition and preprocessing circuit. The input terminal of the current acquisition and preprocessing circuit is also correspondingly connected to the 1#-6# cable cores of the logging cable and the current acquisition and preprocessing circuit. The output terminal of the current acquisition and preprocessing circuit is connected to the processing board.
[0011] Preferably, the input terminals of the high-voltage shunt circuit are HV+ and HV-, which are connected to the high-voltage output terminal of the high-voltage board. The high-voltage shunt circuit is used to perform voltage division processing on the high voltage. The current acquisition and preprocessing circuit samples and preprocesses the output current of each cable core through a filter circuit. The preprocessed signal is input to the processing board through L+ and L- for acquisition. The relay array receives commands from the processing board to set and reset each relay in the relay array. The relay array includes 12 relays, namely K1A-K12A. K1A, K3A, K5A, K7A, K9A, and K11A are connected in series, and K2A, K4A, K6A, K8A, K10A, and K12A are connected in series. K1A, K3A, K5A, K7A, K9A, and K11A are also connected in parallel with K2A, K4A, K6A, K8A, K10A, and K12A respectively. The input terminal of K1A is connected to the output terminal of the high-voltage shunt circuit.
[0012] The current acquisition and preprocessing circuit is set to six groups. The output terminal of the relay K2A and K1A connected in parallel is connected to the input terminal of the first group of current acquisition and preprocessing circuits. The input terminal of the first group of current acquisition and preprocessing circuits is also connected to the No. 1 core of the logging cable.
[0013] The output terminal of relays K4A and K3A connected in parallel is connected to the input terminal of the second set of current acquisition and preprocessing circuits. The input terminal of the second set of current acquisition and preprocessing circuits is also connected to the No. 2 core of the logging cable.
[0014] The output terminal of relays K5A and K6A connected in parallel is connected to the input terminal of the third set of current acquisition and preprocessing circuits. The input terminal of the third set of current acquisition and preprocessing circuits is also connected to the No. 3 core of the logging cable.
[0015] The output terminal of relays K7A and K8A connected in parallel is connected to the input terminal of the fourth current acquisition and preprocessing circuit. The input terminal of the fourth current acquisition and preprocessing circuit is also connected to the No. 4 core of the logging cable.
[0016] The output terminal of relays K2A and K1A connected in parallel is connected to the input terminal of the fifth current acquisition and preprocessing circuit. The input terminal of the fifth current acquisition and preprocessing circuit is also connected to the No. 5 core of the logging cable.
[0017] The output terminal of relays K2A and K1A connected in parallel is connected to the input terminal of the sixth current acquisition and preprocessing circuit. The input terminal of the sixth current acquisition and preprocessing circuit is also connected to the No. 6 core of the logging cable.
[0018] In the initial state, all cable cores 1#-7# in the downhole detector are in a connected state. Before the male and female connectors are successfully connected or when the connection is unsuccessful, the processing board on the ground detection and control instrument measures that the resistance between all cable cores of the logging cable is infinite. After the male and female connectors are successfully connected, the resistance measured by the processing board on the ground detection and control instrument is the sum of the resistance values of the two cable cores, which can be used to determine whether the connection is successful.
[0019] When performing insulation measurement of the logging cable core, the ground detection and control instrument sends a command to the downhole detection instrument through the No. 7 cable core. After receiving the command, the downhole detection instrument disconnects the No. 1-6 cable cores between the male connector and the downhole instrument string. The ground detection and control instrument supplies high voltage to the No. 1-6 cable cores respectively to measure the insulation value. After the measurement is completed, the downhole detection instrument restores the connection state of the No. 1-6 cable cores.
[0020] During the insulation measurement of the logging cable core, the surface detection and control instrument sends a 72V DC power signal to the relay power board of the downhole detection instrument through the 7# core of the logging cable. After receiving the signal, the relay power board sends control commands to the relay capacitor board and the core distribution board, and provides a stable working power supply to the relay capacitor board and the core distribution board. After receiving the control command from the relay power board, the relay capacitor board sets the relays on the relay capacitor board, disconnecting the electrical connection between the 5# and 6# cores of the logging cable and the logging instrument string. After receiving the control command from the relay power board, the core distribution board sets the relays on the relay capacitor board, disconnecting the electrical connection between the 1#, 2#, 3#, and 4# cores of the cable and the logging instrument string. The high-voltage shunt circuit of the relay board of the surface detection and control instrument transmits high voltage to the 1#-6# cores respectively. The processing board measures and calculates the insulation resistance value of the 1#-6# cores respectively and displays it on the LED display screen. After the insulation value detection is completed, all relays on the relay capacitor board reset, and the logging cable is connected to the logging instrument string.
[0021] When measuring the insulation between cable cores #1 and #2, relays K1A, K2A, K3A, K5A, K7A, K9A, and K11A are reset, and relays K4A, K6A, K8A, K10A, and K12A are set; when measuring the insulation between cable cores #1 and #3, relays K1A, K2A, K3A, K4A, K5A, K7A, K9A, and K11A are reset, and relays K6A, K8A, K10A, and K12A are set; when measuring the insulation between cable cores #1 and #4, relays K1A, K2A, K3A, K4A, K5A, K6A, K7A, K9A, and K11A are reset, and relays K8A, K10A, and K12A are set; when measuring the insulation between cable cores #1 and #5, the relays... When measuring the insulation between cable cores #1 and #6, relays K1A, K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K10A and K12A are set. When measuring the insulation between cable core #1 and cable sheath, relays K1A, K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K10A and K12A are set. When measuring the insulation between cable core #1 and cable sheath, relays K1A, K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, K10A, K11A, and K12A are reset. When measuring the insulation between cable cores #2 and #3, relays K2A, K3A, K5A, K7A, K9A, and K11A are reset. 1A. Reset, relays K1A, K4A, K6A, K8A, K10A, and K12A are set; when measuring the insulation between cable cores #2 and #4, relays K2A, K3A, K4A, K6A, K5A, K7A, K9A, and K11A are reset, and relays K1A, K8A, K10A, and K12A are set; when measuring the insulation between cable cores #2 and #5, relays K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K1A, K10A, and K12A are set; when measuring the insulation between cable cores #2 and #6, relays K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, and K10A are set. When 11A is reset, relays K1A and K12A are set; when measuring the insulation between #2 and the cable sheath, relays K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, K10A, K11A, and K12A are reset, and relay K1A is set; when measuring the insulation between #3 and #4 cable cores, relays K2A, K4A, K5A, K6A, K7A, K9A, and K11A are reset, and relays K1A, K3A, K10A, and K12A are set; when measuring the insulation between #3 and #5 cable cores, relays K2A, K4A, K5A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K1A, K3A, K8A, K10A, and K12A are set.When measuring the insulation between cable cores #3 and #6, relays K2A, K4A, K5A, K6A, K7A, K8A, K9A, K10A, and K11A are reset, and relays K1A, K3A, K8A, and K12A are set. When measuring the insulation between cable core #3 and the cable sheath, relays K2A, K4A, K5A, K6A, K7A, K8A, K9A, K10A, K11A, and K12A are reset, and relays K1A and K3A are set. When measuring the insulation between cable cores #4 and #5, relays K2A, K4A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K1A, K3A, K5A, K10A, and K12A are set. When measuring the insulation between cable cores #4 and #6, relays K2A, K4A, K6A, K7A, K8A, K9A, K10A, and K11A are reset, and relays K1A, K3A, K5A, and K12A are set. When measuring the insulation between cable core #4 and the cable sheath, relays K2A, K4A, K6A, K7A, K8A, K9A, K10A, K11A, and K12A are reset, and relays K1A, K3A, and K5A are set; when measuring the insulation between cable cores #5 and #6, relays K2A, K4A, K6A, K7A, K8A, K9A, K10A, and K11A are reset, and relays K1A, K3A, K5A, and K12A are set. When measuring the insulation between cable core #5 and the cable sheath, relays K2A, K4A, K6A, K8A, K9A, K10A, K11A, and K12A are reset, and relays K1A, K3A, K5A, and K7A are set. When measuring the insulation between cable core #6 and the cable sheath, relays K2A, K4A, K6A, K8A, K10A, K11A, and K12A are reset, and relays K1A, K3A, K5A, K7A, and K9A are set.
[0022] The beneficial effects of this invention are:
[0023] This invention can quickly measure the electrical resistance value of any cable core between the logging cable and the downhole instrument after the male and female connectors are connected, and determine whether the connection is successful; when the logging cable and the downhole instrument are connected, it measures the insulation performance of the electrical path after the cable and the male and female connectors are connected, and protects the instrument from damage, providing a reliable basis for quickly judging the cause of the fault at the logging site. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of the detection device for the connection performance of wet joints in horizontal wells according to the present invention;
[0025] Figure 2 This is a schematic diagram of the downhole testing instrument in the testing device for the connection performance of wet joints in horizontal wells according to the present invention;
[0026] Figure 3This is a schematic diagram of the surface detection and control instrument in the detection device for the connection performance of wet joints in horizontal wells according to the present invention;
[0027] Figure 4 This is a circuit diagram of the relay board in the testing device for the continuity performance of wet joints in horizontal wells according to the present invention.
[0028] Figure 4a This is a current diagram of the high-voltage shunt circuit of the relay board in the testing device for the continuity performance of wet joints in horizontal wells according to the present invention.
[0029] Figure 4b This is a circuit diagram of the relay array in the relay board of the device for testing the continuity performance of wet joints in horizontal wells according to the present invention.
[0030] Figure 4c This is a circuit diagram of the current acquisition and preprocessing circuit of the relay board in the detection device for the continuity performance of wet joints in horizontal wells according to the present invention.
[0031] In the diagram: 1. Downhole monitoring instrument, 2. Surface monitoring and control instrument, 3. Female connector, 4. Male connector, 5. Logging cable, 6. Logging instrument string;
[0032] 101. Outer shell, 102. Instrument frame, 103. Cable core distribution board, 104. Relay capacitor board, 105. Relay power supply board, 106. Standard instrument upper connector, 107. Standard instrument lower connector;
[0033] 201. Outer casing a, 202. High voltage board, 203. Switching power supply, 204. Relay board, 205. Processing board, 206. Flexible wiring;
[0034] 4-1. High-voltage shunt circuit; 4-2. Relay array; 4-3. Current acquisition and preprocessing circuit. Detailed Implementation
[0035] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments;
[0036] Example 1
[0037] This invention relates to a device for testing the continuity performance of wet joints in horizontal wells, such as... Figure 1 As shown, it includes a downhole detection instrument 1 and a surface detection and control instrument 2. The surface detection and control instrument 2 is connected to the upper end of the logging cable 5. The lower end of the logging cable 5 is connected to the female connector 3 of the horizontal well wet connector tool. The male connector 4 of the horizontal well wet connector tool is connected to the downhole detection instrument 1. The other end of the downhole detection instrument 1 is connected to a logging instrument string 6.
[0038] The logging cable 5 is a 7-core cable, including cores 1#-7#.
[0039] After receiving commands from the surface detection and control instrument 2, the downhole detection instrument 1 controls the continuity of cable cores 1-6 between the male connector 4 and the downhole instrument string 6. Initially, all cable cores 1-7 in the downhole detection instrument 1 are connected. Before or when the male connector 4 and female connector 3 are successfully connected, the surface detection and control instrument 2 measures an infinite resistance value between all cable cores of the logging cable 5. After the male connector 4 and female connector 3 are successfully connected, the resistance value measured by the surface detection and control instrument 2 is the sum of the resistance values of the two cable cores, thus determining whether the connection was successful.
[0040] When performing insulation measurement of the logging cable core, the ground detection and control instrument 2 sends a command to the downhole detection instrument 1 through the 7# cable core. After receiving the command, the downhole detection instrument 1 disconnects the 1#-6# cable cores between the male connector 4 and the downhole instrument string 6. The ground detection and control instrument 2 supplies high voltage to the 1#-6# cable cores respectively to measure the insulation value. After the measurement is completed, the downhole detection instrument 1 restores the connection state of the 1#-6# cable cores.
[0041] Example 2
[0042] Based on Example 1, such as Figure 2 As shown, the downhole detection instrument 1 includes a housing 101. A standard instrument upper connector 106 and a standard instrument lower connector 107 are respectively installed at both ends inside the housing 101. The standard instrument upper connector 106 and the standard instrument lower connector 107 are electrically connected to the male connector 4 of the horizontal well wet connector tool and the logging instrument string 6, respectively. An instrument frame 102 is installed inside the housing 101. The two ends of the instrument frame 102 are connected to the standard instrument upper connector 106 and the standard instrument lower connector 107, respectively, to achieve electrical connection with the upper horizontal well wet connector tool and the lower logging instrument string. A cable core distribution plate 103, a relay capacitor plate 104, and a relay power supply plate 105 are installed on the instrument frame 102. The relay power supply plate 105 is electrically connected to the standard instrument upper connector 106. The standard instrument upper connector 106 is also electrically connected to the cable core distribution plate 103, the relay capacitor plate 104, and the relay power supply plate 105. The relay power supply plate 105 is electrically connected to the relay capacitor plate 104 and the cable core distribution plate 103, respectively.
[0043] All standard instrument upper connectors 106 are 7-pin connectors, and standard instrument lower connectors 107 are 7-core connectors. The upper ends of pins 1#-7# of the standard instrument upper connector 106 are connected to the corresponding cores 1#-7# of the logging cable 5 through the female connector 3 and male connector 4 of the horizontal well wet connector tool, respectively. The lower ends of pins 1#-4# of the standard instrument upper connector 106 are connected to the core distribution plate 103. The lower ends of pins 5#-7# of the standard instrument upper connector 106 are connected to the relay capacitor plate 104. The lower end of pin 7# of the standard instrument upper connector 106 is also connected to the relay power board 105. The lower end of the core corresponding to pin 7# of the standard instrument upper connector 106 on the relay capacitor plate 104 is connected to the core 7# of the standard instrument lower connector 107.
[0044] During the insulation measurement of the logging cable core, the surface detection and control instrument 2 sends a 72V DC power signal to the relay power board 105 of the downhole detection instrument 1 through the 7# core of the logging cable 5. After receiving the signal, the relay power board 105 sends control commands to the relay capacitor board 104 and the core distribution board 103 respectively, and provides a stable working power supply to the relay capacitor board 104 and the core distribution board 103. After receiving the control command from the relay power board 105, the relay on the relay capacitor board 104 is set, disconnecting the 5# core of the logging cable 5. The electrical connection between cable core 6 and logging instrument string 6 is established. After receiving the control command from relay power board 105, cable core distribution board 103 sets the relays on relay capacitor board 104, disconnecting the electrical connection between cable cores 1, 2, 3, and 4 and logging instrument string 6. The surface detection and control instrument 2 transmits high voltage to cable cores 1-6 respectively, measures and calculates the insulation resistance values of cable cores 1-6, and displays them on the LED screen. After the insulation value detection is completed, all relays on relay capacitor board 104 reset, and logging cable 5 connects to logging instrument string 6. The lower end of cable core 7 on relay capacitor board 104 is directly connected to cable core 7 of instrument connector 107, with a DC blocking capacitor in between to ensure the transmission of AC signals and prevent DC control signals from being transmitted to the logging instrument, which could damage the instrument.
[0045] Example 3
[0046] Based on Example 2, such as Figure 3As shown, the ground detection and control instrument 2 includes a housing a201. Inside the housing a201, there is a high-voltage board 202, a switching power supply 203, a relay board 204, and a processing board 205. The switching power supply 203 converts 220VAC into 12VDC and 24VDC DC power. The switching power supply 203 is electrically connected to the high-voltage board 202. The high-voltage board 202 is also connected to the relay board 204 and the processing board 205 in sequence. The processing board 205 can realize resistance measurement, calculation functions, and relay combination control functions. The housing a201 is also provided with a flexible cable 206, which includes 8 cable cores. One end is connected to the 1#-7# cable cores and the ground wire of the logging cable 5, and the other end is connected to the input terminal of the relay board 204. The housing a201 is also provided with an LED display screen, which is connected to the processing board 205 to realize the resistance display function.
[0047] The high-voltage board 202 generates a 100kHz square wave via an oscillator, and uses a backup voltage circuit to boost the 12V low-voltage DC power supply to a 500V high-voltage DC power supply for cable insulation value detection. The relay board 204 receives control signals from the processing board 205 to switch cable cores, measure the cable core insulation and resistance values, and uploads the measured values to the LED display screen.
[0048] like Figure 4 As shown, the relay board 204 includes a high-voltage shunt circuit 4-1. The input terminal of the high-voltage shunt circuit 4-1 is connected to the high-voltage output terminal of the high-voltage board 202. The output terminal of the high-voltage shunt circuit 4-1 is connected to the input terminal of the relay array 4-2. The control terminal of each relay in the relay array 4-2 is connected to the processing board 205. The output terminal of the relay array 4-2 is correspondingly connected to the input terminal of the current acquisition preprocessing circuit 4-3. The input terminal of the current acquisition preprocessing circuit 4-3 is also correspondingly connected to the 1#-6# cable cores of the logging cable 5 and the current acquisition preprocessing circuit. The output terminal of the current acquisition preprocessing circuit 4-3 is connected to the processing board 205.
[0049] like Figure 4a As shown, the input terminals of the high-voltage shunt circuit 4-1 are HV+ and HV-, which are connected to the high-voltage output terminal of the high-voltage board 202. The high-voltage shunt circuit 4-1 is used to perform voltage division processing on the high voltage. The current acquisition and preprocessing circuit 4-3 samples and preprocesses the output current of each cable core through a filter circuit. The preprocessed signal is input to the processing board 205 through L+ and L- for acquisition, such as... Figure 4bAs shown, the relay array 4-2 receives commands from the processing board 205 to set and reset each relay in the relay array 4-2. The relay array 4-2 includes 12 relays, namely K1A-K12A. K1A, K3A, K5A, K7A, K9A, and K11A are connected in series, and K2A, K4A, K6A, K8A, K10A, and K12A are connected in series. K1A, K3A, K5A, K7A, K9A, and K11A are also connected in parallel with K2A, K4A, K6A, K8A, K10A, and K12A respectively. The input terminal of K1A is connected to the output terminal of the high-voltage shunt circuit 4-1.
[0050] like Figure 4c As shown, the current acquisition preprocessing circuit 4-3 is set to six groups. The output terminal of the relays K2A and K1A connected in parallel is connected to the input terminal of the first group of current acquisition preprocessing circuit 4-3. The input terminal of the first group of current acquisition preprocessing circuit 4-3 is simultaneously connected to the No. 1 core of the logging cable 5.
[0051] The output terminal of relays K4A and K3A connected in parallel is connected to the input terminal of the second set of current acquisition and preprocessing circuits 4-3. The input terminal of the second set of current acquisition and preprocessing circuits 4-3 is simultaneously connected to the No. 2 core of the logging cable 5.
[0052] The output terminal of relays K5A and K6A connected in parallel is connected to the input terminal of the third current acquisition preprocessing circuit 4-3. The input terminal of the third current acquisition preprocessing circuit 4-3 is simultaneously connected to the No. 3 core of the logging cable 5.
[0053] The output terminal of relays K7A and K8A connected in parallel is connected to the input terminal of the fourth current acquisition preprocessing circuit 4-3. The input terminal of the fourth current acquisition preprocessing circuit 4-3 is simultaneously connected to the 4# core of the logging cable 5.
[0054] The output terminal of relays K2A and K1A connected in parallel is connected to the input terminal of the fifth current acquisition preprocessing circuit 4-3. The input terminal of the fifth current acquisition preprocessing circuit 4-3 is simultaneously connected to the 5# cable core of logging cable 5.
[0055] The output terminal of relays K2A and K1A connected in parallel is connected to the input terminal of the sixth current acquisition preprocessing circuit 4-3. The input terminal of the sixth current acquisition preprocessing circuit 4-3 is simultaneously connected to the 6# cable core of logging cable 5.
[0056] In the initial state, all cable cores 1#-7# in the downhole detector 1 are in a connected state. Before the male connector 4 and female connector 3 are successfully connected or when the connection is unsuccessful, the processing board 205 on the ground detection and control instrument 2 measures that the resistance value between all cable cores of the logging cable 5 is infinite. After the male connector 4 and female connector 3 are successfully connected, the resistance value measured by the processing board 205 on the ground detection and control instrument 2 is the sum of the resistance values of the two cable cores, which can be used to determine whether the connection is successful.
[0057] When performing insulation measurement of the logging cable core, the ground detection and control instrument 2 sends a command to the downhole detection instrument 1 through the 7# cable core. After receiving the command, the downhole detection instrument 1 disconnects the 1#-6# cable cores between the male connector 4 and the downhole instrument string 6. The ground detection and control instrument 2 supplies high voltage to the 1#-6# cable cores respectively to measure the insulation value. After the measurement is completed, the downhole detection instrument 1 restores the connection state of the 1#-6# cable cores.
[0058] During the insulation measurement of the logging cable core, the surface detection and control instrument 2 sends a 72V DC power signal to the relay power board 105 of the downhole detection instrument 1 through the 7# core of the logging cable 5. After receiving the signal, the relay power board 105 sends control commands to the relay capacitor board 104 and the core distribution board 103 respectively, and provides a stable working power supply to the relay capacitor board 104 and the core distribution board 103. After receiving the control command from the relay power board 105, the relay on the relay capacitor board 104 is set, disconnecting the 5# and 6# cores of the logging cable 5 from the logging instrument string 6. The electrical connection between them is established; after the cable core distribution board 103 receives the control command issued by the relay power board 105, the relays on the relay capacitor board 104 are set, disconnecting the electrical connection between cable cores 1, 2, 3, and 4 and the logging instrument string 6. The high voltage shunt circuit 4-1 of the relay board 204 of the ground detection and control instrument 2 transmits high voltage to cable cores 1-6 respectively. The processing board 205 measures and calculates the insulation resistance value of cable cores 1-6 respectively and displays it on the LED display screen. After the insulation value detection is completed, all relays on the relay capacitor board 104 are reset, and the logging cable 5 is connected to the logging instrument string 6.
[0059] Example 4
[0060] Based on Example 3, when measuring the insulation between cable cores #1 and #2, relays K1A, K2A, K3A, K5A, K7A, K9A, and K11A are reset, and relays K4A, K6A, K8A, K10A, and K12A are set; when measuring the insulation between cable cores #1 and #3, relays K1A, K2A, K3A, K4A, K5A, K7A, K9A, and K11A are reset, and relays K6A, K8A, K10A, and K12A are set; when measuring the insulation between cable cores #1 and #4, relays K1A, K2A, K3A, K4A, K5A, K6A, K7A, K9A, and K11A are reset, and relays K8A, K10A, and K12A are set; when measuring the insulation between cable cores #1 and #5... When measuring insulation between cable cores #1 and #6, relays K1A, K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K10A and K12A are set. When measuring insulation between cable core #1 and cable sheath, relays K1A, K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K10A and K12A are set. When measuring insulation between cable core #1 and cable sheath, relays K1A, K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, K10A, K11A, and K12A are reset. When measuring insulation between cable cores #2 and #3, relays K2A, K3A, K5A, K7A, K11A, K12A, K10A, K12A, K11A, K12A are reset. Reset relays K1A, K11A, K1A, K4A, K6A, K8A, K10A, and K12A; when measuring the insulation between cable cores #2 and #4, reset relays K2A, K3A, K4A, K6A, K5A, K7A, K9A, and K11A, and set relays K1A, K8A, K10A, and K12A; when measuring the insulation between cable cores #2 and #5, reset relays K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, and K11A, and set relays K1A, K10A, and K12A; when measuring the insulation between cable cores #2 and #6, reset relays K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, and K10A. When measuring the insulation between cable core #2 and the cable sheath, relays K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, K10A, K11A, and K12A are reset, and relay K1A is set. When measuring the insulation between cable cores #3 and #4, relays K2A, K4A, K5A, K6A, K7A, K9A, and K11A are reset, and relays K1A, K3A, K10A, and K12A are set. When measuring the insulation between cable cores #3 and #5, relays K2A, K4A, K5A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K1A, K3A, K8A, K10A, and K12A are set.When measuring the insulation between cable cores #3 and #6, relays K2A, K4A, K5A, K6A, K7A, K8A, K9A, K10A, and K11A are reset, and relays K1A, K3A, K8A, and K12A are set. When measuring the insulation between cable core #3 and the cable sheath, relays K2A, K4A, K5A, K6A, K7A, K8A, K9A, K10A, K11A, and K12A are reset, and relays K1A and K3A are set. When measuring the insulation between cable cores #4 and #5, relays K2A, K4A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K1A, K3A, K5A, K10A, and K12A are set. When measuring the insulation between cable cores #4 and #6, relays K2A, K4A, K6A, K7A, K8A, K9A, K10A, and K11A are reset, and relays K1A, K3A, K5A, and K12A are set. When measuring the insulation between cable core #4 and the cable sheath, relays K2A, K4A, K6A, K7A, K8A, K9A, K10A, K11A, and K12A are reset, and relays K1A, K3A, and K5A are set; when measuring the insulation between cable cores #5 and #6, relays K2A, K4A, K6A, K7A, K8A, K9A, K10A, and K11A are reset, and relays K1A, K3A, K5A, and K12A are set. When measuring the insulation between cable core #5 and the cable sheath, relays K2A, K4A, K6A, K8A, K9A, K10A, K11A, and K12A are reset, and relays K1A, K3A, K5A, and K7A are set. When measuring the insulation between cable core #6 and the cable sheath, relays K2A, K4A, K6A, K8A, K10A, K11A, and K12A are reset, and relays K1A, K3A, K5A, K7A, and K9A are set.
Claims
1. A testing device for the continuity performance of wet joints in horizontal wells, characterized in that, It includes a downhole detection instrument (1) and a surface detection and control instrument (2). The surface detection and control instrument (2) is connected to the upper end of the logging cable (5). The lower end of the logging cable (5) is connected to the female connector (3) of the horizontal well wet connector tool. The male connector (4) of the horizontal well wet connector tool is connected to the downhole detection instrument (1). The other end of the downhole detection instrument (1) is connected to a logging instrument string (6).
2. The testing device for the continuity performance of wet joints in horizontal wells according to claim 1, characterized in that, The logging cable (5) is a 7-core cable, including cores 1#-7#.
3. The testing device for the continuity performance of wet joints in horizontal wells according to claim 2, characterized in that, The downhole detection instrument (1) includes a housing (101). A standard instrument upper connector (106) and a standard instrument lower connector (107) are respectively provided at both ends inside the housing (101). The standard instrument upper connector (106) and the standard instrument lower connector (107) are electrically connected to the male connector (4) of the horizontal well wet connector tool and the logging instrument string (6), respectively. An instrument frame (102) is provided inside the housing (101). Both ends of the instrument frame (102) are respectively connected to the standard instrument upper connector (106) and the standard instrument lower connector (107). 07) Connection: The instrument frame (102) is equipped with a cable core distribution plate (103), a relay capacitor plate (104), and a relay power supply plate (105). The relay power supply plate (105) is electrically connected to the standard instrument connector (106). The standard instrument connector (106) is also electrically connected to the cable core distribution plate (103), the relay capacitor plate (104), and the relay power supply plate (105). The relay power supply plate (105) is electrically connected to the relay capacitor plate (104) and the cable core distribution plate (103) respectively.
4. The testing device for the continuity performance of wet joints in horizontal wells according to claim 3, characterized in that, The standard instrument upper connector (106) is a 7-pin connector, and the standard instrument lower connector (107) is a 7-core connector. The upper ends of pins 1#-7# of the standard instrument upper connector (106) are connected to the corresponding cores 1#-7# of the logging cable (5) through the female connector (3) and male connector (4) of the horizontal well wet connector tool, respectively. The lower ends of pins 1#-4# of the standard instrument upper connector (106) are connected to the core distribution plate (103). The lower ends of pins 5#-7# of the standard instrument upper connector (106) are connected to the relay capacitor plate (104). The lower end of pin 7# of the standard instrument upper connector (106) is also connected to the relay power board (105). The lower end of the core corresponding to pin 7# of the standard instrument upper connector (106) on the relay capacitor plate (104) is connected to the core 7# of the standard instrument lower connector (107).
5. The testing device for the continuity performance of wet joints in horizontal wells according to claim 4, characterized in that, The ground detection and control instrument (2) includes a housing a (201). Inside the housing a (201) are a high-voltage board (202), a switching power supply (203), a relay board (204), and a processing board (205). The switching power supply (203) converts 220VAC into 12VDC and 24VDC DC power. The switching power supply (203) is electrically connected to the high-voltage board (202). The high-voltage board (202) is also connected to the relay board (204) and the processing board (205) in sequence. A flexible cable (206) is also provided on the housing a (201). The flexible cable (206) includes 8 cable cores. One end is connected to the 1#-7# cable cores and the ground wire of the logging cable (5) respectively. The other end is connected to the input terminal of the relay board (204) respectively. An LED display screen is also provided on the housing a (201). The LED display screen is connected to the processing board (205).
6. The testing device for the continuity performance of wet joints in horizontal wells according to claim 5, characterized in that, The relay board (204) includes a high-voltage shunt circuit (4-1). The input terminal of the high-voltage shunt circuit (4-1) is connected to the high-voltage output terminal of the high-voltage board (202). The output terminal of the high-voltage shunt circuit (4-1) is connected to the input terminal of the relay array (4-2). The control terminal of each relay in the relay array (4-2) is connected to the processing board (205). The output terminal of the relay array (4-2) is correspondingly connected to the input terminal of the current acquisition preprocessing circuit (4-3). The input terminal of the current acquisition preprocessing circuit (4-3) is simultaneously connected to the 1#-6# cable cores of the logging cable (5) and the current acquisition preprocessing circuit. The output terminal of the current acquisition preprocessing circuit (4-3) is connected to the processing board (205).
7. The testing device for the continuity performance of wet joints in horizontal wells according to claim 6, characterized in that, The high-voltage shunt circuit (4-1) has HV+ and HV- as inputs, which are connected to the high-voltage output of the high-voltage board (202). The high-voltage shunt circuit (4-1) is used to divide the high voltage. The current acquisition and preprocessing circuit (4-3) samples and preprocesses the output current of each cable core through a filter circuit. The preprocessed signal is input to the processing board (205) via L+ and L- for acquisition. The relay array (4-2) receives commands from the processing board (205) to realize the operation of each relay in the relay array (4-2). Setting and resetting; the relay array (4-2) includes 12 relays, namely K1A-K12A. K1A, K3A, K5A, K7A, K9A, and K11A are connected in series, and K2A, K4A, K6A, K8A, K10A, and K12A are connected in series. K1A, K3A, K5A, K7A, K9A, and K11A are also connected in parallel with K2A, K4A, K6A, K8A, K10A, and K12A respectively. The input terminal of K1A is connected to the output terminal of the high-voltage shunt circuit (4-1). The current acquisition preprocessing circuit (4-3) is set to six groups. The output terminal of the relay K2A and K1A after being connected in parallel is connected to the input terminal of the first group of current acquisition preprocessing circuit (4-3). The input terminal of the first group of current acquisition preprocessing circuit (4-3) is simultaneously connected to the No. 1 core of the logging cable (5). The output terminal of relays K4A and K3A connected in parallel is connected to the input terminal of the second set of current acquisition preprocessing circuits (4-3). The input terminal of the second set of current acquisition preprocessing circuits (4-3) is simultaneously connected to the No. 2 core of the logging cable (5). The output terminal of relays K5A and K6A connected in parallel is connected to the input terminal of the third current acquisition preprocessing circuit (4-3). The input terminal of the third current acquisition preprocessing circuit (4-3) is simultaneously connected to the 3# cable core of the logging cable (5). The output terminal of relays K7A and K8A connected in parallel is connected to the input terminal of the fourth current acquisition preprocessing circuit (4-3). The input terminal of the fourth current acquisition preprocessing circuit (4-3) is simultaneously connected to the 4# cable core of the logging cable (5). The output terminal of relays K2A and K1A connected in parallel is connected to the input terminal of the fifth group of current acquisition preprocessing circuit (4-3). The input terminal of the fifth group of current acquisition preprocessing circuit (4-3) is simultaneously connected to the 5# cable core of the logging cable (5). The output terminal of relays K2A and K1A connected in parallel is connected to the input terminal of the sixth group of current acquisition preprocessing circuit (4-3). The input terminal of the sixth group of current acquisition preprocessing circuit (4-3) is simultaneously connected to the 6# cable core of the logging cable (5).
8. The testing device for the continuity performance of wet joints in horizontal wells according to claim 7, characterized in that, In the initial state, all cable cores 1#-7# in the downhole detector (1) are in a connected state. Before the male connector (4) and female connector (3) are successfully connected or when the connection is unsuccessful, the processing board (205) on the ground detection controller (2) measures that the resistance between all cable cores of the logging cable (5) is infinite. After the male connector (4) and female connector (3) are successfully connected, the resistance measured by the processing board (205) on the ground detection controller (2) is the sum of the resistance values of the two cable cores. This can be used to determine whether the connection is successful. When performing insulation measurement of the logging cable core, the ground detection controller (2) sends a command to the downhole detection instrument (1) through the 7# cable core. After receiving the command, the downhole detection instrument (1) disconnects the 1-6# cable cores between the male connector (4) and the downhole instrument string (6). The ground detection controller (2) supplies high voltage to the 1#-6# cable cores respectively to perform insulation value measurement. After the measurement is completed, the downhole detection instrument (1) restores the connection state of the 1#-6# cable cores.
9. The testing device for the continuity performance of wet joints in horizontal wells according to claim 8, characterized in that, When performing insulation measurement of the logging cable core, the surface detection and control instrument (2) sends a 72V DC power signal to the relay power board (105) of the downhole detection instrument (1) through the 7# core of the logging cable (5). After receiving the signal, the relay power board (105) sends control commands to the relay capacitor board (104) and the core distribution board (103) respectively, and provides a stable working power supply to the relay capacitor board (104) and the core distribution board (103). After receiving the control command from the relay power board (105), the relay on the relay capacitor board (104) is set, disconnecting the 5# and 6# cores of the logging cable (5) from the logging instrument. Electrical connection between the instrument string (6); after the cable core distribution board 103 receives the control command issued by the relay power board (105), the relay on the relay capacitor board 104 is set, disconnecting the electrical connection between the cable cores 1, 2, 3, and 4 and the logging instrument string (6). The high voltage shunt circuit (4-1) of the relay board (204) of the ground detection controller (2) transmits high voltage to the 1#-6# cable cores respectively. The processing board (205) measures and calculates the insulation resistance value of the 1#-6# cable cores respectively and displays it on the LED display screen. After the insulation value detection is completed, all the relays on the relay capacitor board (104) are reset, and the logging cable (5) is connected to the logging instrument string (6).
10. The testing device for the continuity performance of wet joints in horizontal wells according to claim 9, characterized in that, When measuring the insulation between cable cores #1 and #2, relays K1A, K2A, K3A, K5A, K7A, K9A, and K11A are reset, and relays K4A, K6A, K8A, K10A, and K12A are set; when measuring the insulation between cable cores #1 and #3, relays K1A, K2A, K3A, K4A, K5A, K7A, K9A, and K11A are reset, and relays K6A, K8A, K10A, and K12A are set; when measuring the insulation between cable cores #1 and #4, relays K1A, K2A, K3A, K4A, K5A, K6A, K7A, K9A, and K11A are reset, and relays K8A, K10A, and K12A are set; when measuring the insulation between cable cores #1 and #5, the relays... When measuring the insulation between cable cores #1 and #6, relays K1A, K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K10A and K12A are set. When measuring the insulation between cable core #1 and cable sheath, relays K1A, K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K10A and K12A are set. When measuring the insulation between cable core #1 and cable sheath, relays K1A, K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, K10A, K11A, and K12A are reset. When measuring the insulation between cable cores #2 and #3, relays K2A, K3A, K5A, K7A, K9A, and K11A are reset. 1A. Reset, relays K1A, K4A, K6A, K8A, K10A, and K12A are set; when measuring the insulation between cable cores #2 and #4, relays K2A, K3A, K4A, K6A, K5A, K7A, K9A, and K11A are reset, and relays K1A, K8A, K10A, and K12A are set; when measuring the insulation between cable cores #2 and #5, relays K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K1A, K10A, and K12A are set; when measuring the insulation between cable cores #2 and #6, relays K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, and K10A are set. When 11A is reset, relays K1A and K12A are set; when measuring the insulation between #2 and the cable sheath, relays K2A, K3A, K4A, K5A, K6A, K7A, K8A, K9A, K10A, K11A, and K12A are reset, and relay K1A is set; when measuring the insulation between #3 and #4 cable cores, relays K2A, K4A, K5A, K6A, K7A, K9A, and K11A are reset, and relays K1A, K3A, K10A, and K12A are set; when measuring the insulation between #3 and #5 cable cores, relays K2A, K4A, K5A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K1A, K3A, K8A, K10A, and K12A are set.When measuring the insulation between cable cores #3 and #6, relays K2A, K4A, K5A, K6A, K7A, K8A, K9A, K10A, and K11A are reset, and relays K1A, K3A, K8A, and K12A are set. When measuring the insulation between cable core #3 and the cable sheath, relays K2A, K4A, K5A, K6A, K7A, K8A, K9A, K10A, K11A, and K12A are reset, and relays K1A and K3A are set. When measuring the insulation between cable cores #4 and #5, relays K2A, K4A, K6A, K7A, K8A, K9A, and K11A are reset, and relays K1A, K3A, K5A, K10A, and K12A are set. When measuring the insulation between cable cores #4 and #6, relays K2A, K4A, K6A, K7A, K8A, K9A, K10A, and K11A are reset, and relays K1A, K3A, K5A, and K12A are set. When measuring the insulation between cable core #4 and the cable sheath, relays K2A, K4A, K6A, K7A, K8A, K9A, K10A, K11A, and K12A are reset, and relays K1A, K3A, and K5A are set; when measuring the insulation between cable cores #5 and #6, relays K2A, K4A, K6A, K7A, K8A, K9A, K10A, and K11A are reset, and relays K1A, K3A, K5A, and K12A are set. When measuring the insulation between cable core #5 and the cable sheath, relays K2A, K4A, K6A, K8A, K9A, K10A, K11A, and K12A are reset, and relays K1A, K3A, K5A, and K7A are set. When measuring the insulation between cable core #6 and the cable sheath, relays K2A, K4A, K6A, K8A, K10A, K11A, and K12A are reset, and relays K1A, K3A, K5A, K7A, and K9A are set.