Continuous oil pipe water exploration device for horizontal well

Abstract

The invention discloses a horizontal well coiled tubing water exploration device, and belongs to the technical field of petroleum testing equipment, a transmission mechanism is connected with one end of a sleeve, a coiled tubing is arranged in the sleeve, a cable is arranged in the coiled tubing, an electric submersible pump is arranged in the coiled tubing, the electric submersible pump is electrically connected with the cable, a logging instrument is arranged in the coiled tubing, and the logging instrument is electrically connected with the cable. The logging roller is driven by the roller motor to rotate, the logging roller can stably put down and recycle the coiled tubing and drag the electric submersible pump and the logging instrument which are connected with the coiled tubing, the logging instrument can measure the water content in a well, and the precision and reliability of the logging instrument for obtaining water outlet point information in the well are guaranteed; the electric submersible pump is used for lifting liquid in the horizontal well to the ground, under the state that the electric submersible pump and the logging instrument are dragged, the slip ring supplies power to the electric submersible pump and the logging instrument through the cable, logging operation is guaranteed, and the electric submersible pump and the logging instrument have the advantages of being easy to operate, safe, reliable, high in data acquisition precision and high in data transmission and power supply stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil testing equipment, and particularly relates to a water finding device for coiled tubing in horizontal wells. Background Art

[0002] The water finding device for coiled tubing in horizontal wells is a device used to locate and find water in the coiled tubing of horizontal wells, which can effectively solve the problem of difficult water finding in coiled tubing in horizontal wells. The water finding device for coiled tubing in horizontal wells is sent into the tubing through the wellhead, and the position of water and the well wall in the tubing are detected by the detection technology of the detector. The water finding device for coiled tubing in horizontal wells also has a rotation system that can enable the detector to scan the well wall comprehensively, so as to obtain more comprehensive detection data. The data acquisition system collects the data of the detector and transmits it to the ground computer through a cable for processing. Finally, the ground computer can analyze the data to obtain the position of water and the position of the well wall in the tubing, and provide it to the operator as a decision-making basis.

[0003] However, the current water finding device for coiled tubing in horizontal wells has a relatively small diameter of the cable used. In the case of needing to monitor a relatively deep well depth or a long distance, the cable cannot transmit the strong electricity on the ground to the downhole equipment for use, which limits the selection of downhole equipment. At the same time, the cable size is small, and the cable stability is poor, which cannot guarantee the stability of data transmission and power supply. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned disadvantages of the prior art and provide a water finding device for coiled tubing in horizontal wells with high data transmission and power supply stability and high acquisition accuracy.

[0005] The technical solution adopted to solve the above technical problem is: a water finding device for coiled tubing in horizontal wells includes a transmission mechanism, a casing, coiled tubing, a cable, an electric submersible pump, and a logging tool. The transmission mechanism is located on the ground and is connected to one end of the casing. The casing is located in the horizontal well to fix the well wall. The inside of the casing is provided with coiled tubing. The inside of the coiled tubing is provided with a cable electrically connected to the transmission mechanism. The inside of the coiled tubing is provided with an electric submersible pump for lifting the liquid in the horizontal well to the ground. The electric submersible pump is electrically connected to the cable. The inside of the coiled tubing is provided with a logging tool for testing the information of the water outlet point in the well. The logging tool is electrically connected to the cable. The electric submersible pump and the logging tool are located inside the coiled tubing.

[0006] Further, the coiled tubing and the cable are of an integrally formed structure.

[0007] Further, the cable is a multi-core cable, and the multi-core cable is a 2-core cable or a 3-core cable or a 4-core cable or a 6-core cable or an 8-core cable, and the diameter of the cable is greater than 20 mm.

[0008] Further, the transmission mechanism is as follows: a logging drum electrically connected to the drive unit is provided on the drum support. The logging drum is connected to one end of the coiled tubing, and a slip ring electrically connected to the cable is provided at one end of the logging drum.

[0009] Further, the number of rings of the slip ring is equal to the number of wire cores of the cable.

[0010] Further, the drive unit is as follows: a drum motor and a reducer are provided on the drum support. The drum motor is connected to the reducer through chain drive, and the output end of the drum motor is connected to the logging drum.

[0011] Further, a leakage detection system electrically connected to the slip ring is provided on the drum support.

[0012] Further, a grounding rod is provided on the drum support. One end of the grounding rod is electrically connected to the leakage detection system, and the other end of the grounding rod is in contact with the ground.

[0013] Further, one end of the coiled tubing is connected to one end of a slip connector, the other end of the slip connector is connected to one end of a cable fixator, the cable passes through the inside of the slip connector and the cable fixator, the cable is fixedly connected to the cable fixator, and a cable seal head connected to the other end of the cable fixator is provided at one end of the cable.

[0014] Further, the logging tool is a gamma ray logging tool or an absorption logging tool or an acoustic logging tool.

[0015] The beneficial effects of the present invention are as follows: (1) The present invention uses a drum motor to drive the logging drum to rotate. The logging drum can stably lower and retrieve the coiled tubing, and drag the electric submersible pump and the logging tool connected to the coiled tubing. The logging tool can measure the water content in the well, ensuring the accuracy and reliability of obtaining the information of the water outlet point in the well. The electric submersible pump is used to lift the liquid in the horizontal well to the ground. In the state of dragging the electric submersible pump and the logging tool, the slip ring supplies power to the electric submersible pump and the logging tool through the cable, ensuring the logging operation. The present invention has the advantages of simple operation, safety and reliability, high data acquisition accuracy, high work efficiency and high work quality.

[0016] (2) The present invention uses a multi-core cable with a diameter greater than 20 mm. The multi-core cable can carry a larger voltage. When monitoring a deeper well depth or a long distance, it can transmit strong power from the ground to the electric submersible pump and the logging tool in the well, ensuring the stability of power supply and making the input voltage higher. The electric submersible pump and the logging tool are electrically connected to the cable. On the one hand, the cable can ensure the stability of power supply, and on the other hand, it makes the input voltage higher. Using a high voltage can reduce the signal-to-noise ratio of the signal and noise, improve the quality and stability of signal transmission, and reduce the possibility of signal interference.

[0017] (3) The present invention adopts an integrated forming structure of coiled tubing and cable, and manufactures the cable and coiled tubing integrally by a pre-setting method. The pre-set cable can be completed on the production line, avoiding the time and cost of on-site assembly and connection, improving the assembly efficiency, reducing the production cost, and at the same time reducing the uncertainty and error rate of manual operation. The pre-set cable can be quality-controlled and tested on the production line to ensure that the connection and performance of the cable meet the requirements, avoiding potential safety hazards and quality problems that may be brought by on-site assembly. In addition, the pre-set cable can reduce the number of connection points and joints, improve the reliability and service life of the cable. The pre-set cable can be designed and manufactured according to the requirements of specific application scenarios, meeting the needs of different environments and working conditions, and having a wider scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The attached drawings forming a part of this invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 FIG. is a schematic structural diagram of an embodiment of the water finding device for coiled tubing in horizontal wells of the present invention.

[0020] Figure 2 FIG. is a schematic structural diagram of parts on the coiled tubing and cable.

[0021] Figure 3 FIG. is a schematic structural diagram of the transmission mechanism.

[0022] Reference numerals: 101, slip ring; 102, leakage detection system; 103, roller support; 104, logging roller; 105, reducer; 106, chain; 107, roller motor; 2, casing; 3, coiled tubing; 4, cable; 5, electric submersible pump; 6, logging tool; 7, cable seal head; 8, cable fixator; 9, slip connector. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention will be described in detail below with reference to the drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0024] The following detailed descriptions are all exemplary descriptions, aiming to provide a further detailed description of the present invention. Unless otherwise specified, all technical terms adopted by the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0025] As Figures 1 to 2As shown in the figure, a water finding device for coiled tubing in a horizontal well in this embodiment includes a transmission mechanism, a casing 2, a coiled tubing 3, a cable 4, an electric submersible pump 5, and a logging tool 6. The transmission mechanism is located on the ground and is connected to one end of the casing 2. The casing 2 is located in the horizontal well to fix the wellbore. The casing 2 is a pipeline in the petroleum industry, usually made of steel pipe or plastic pipe, and is used to fix and protect the wellbore, control wellbore fractures, and prevent formation collapse. Inside the casing 2, there is a coiled tubing 3. The coiled tubing 3 is a pipeline for petroleum extraction, which is a long pipe made of high-strength steel pipe. The coiled tubing 3 can be installed from the ground into the well and embedded into the pores at one time. Inside the coiled tubing 3, there is a cable 4 electrically connected to the transmission mechanism. The coiled tubing 3 and the cable 4 are of an integrally formed structure. The cable 4 and the coiled tubing 3 are integrally produced in a pre-set manner. The pre-set cable can be completed on the production line, avoiding the time and cost of on-site assembly and connection, improving the assembly efficiency, reducing the production cost, and at the same time reducing the uncertainty and error rate of manual operation. The pre-set cable can be quality controlled and tested on the production line to ensure that the connection and performance of the cable meet the requirements, avoiding potential safety hazards and quality problems that may be brought by on-site assembly. In addition, the pre-set cable can reduce the number of connection points and joints, improve the reliability and service life of the cable. The pre-set cable can be designed and manufactured according to the requirements of specific application scenarios to meet the needs of different environments and working conditions. The cable 4 is a multi-core cable, and the multi-core cable is a 2-core cable or a 3-core cable or a 4-core cable or a 6-core cable or an 8-core cable. The diameter of the cable 4 is greater than 20 mm.

[0026] Inside the coiled tubing 3, there is an electric submersible pump 5 for lifting the liquid in the horizontal well to the ground. The electric submersible pump 5 is electrically connected to the cable 4. Inside the coiled tubing 3, there is a logging tool 6 for testing the information of the water outlet point in the well. The logging tool 6 is electrically connected to the cable 4. On the one hand, the cable 4 can ensure the stability of power supply. On the other hand, it can make the input voltage higher. Using a high voltage can reduce the signal-to-noise ratio of the signal and noise, improve the quality and stability of signal transmission, and reduce the possibility of signal interference. The electric submersible pump 5 and the logging tool 6 are located inside the coiled tubing 3. The logging tool 6 is a gamma ray logging tool or an absorption logging tool or an acoustic logging tool.

[0027] One end of the coiled tubing 3 is connected to one end of a slip connector 9, and the other end of the slip connector 9 is connected to one end of a cable retainer 8. The cable 4 passes through the inside of the slip connector 9 and the cable retainer 8. The cable 4 is fixedly connected to the cable retainer 8. One end of the cable 4 is provided with a cable seal head 7 connected to the other end of the cable retainer 8 to prevent the cable 4 from shaking or moving in the coiled tubing 3 and ensure the safety and reliability of the cable 4 during use.

[0028] As Figure 3As shown in the figure, the transmission mechanism is composed of a slip ring 101, a leakage detection system 102, a logging drum support 103, a logging drum 104, a reducer 105, a chain 106, and a drum motor 107 connected together.

[0029] The transmission mechanism is as follows: A logging drum 104 electrically connected to the drive unit is provided on the logging drum support 103. The logging drum support 103 is used to support the logging drum 104, enabling the logging drum 104 to rotate on the logging drum support 103 and lower the logging tool 6. One end of the logging drum 104 is connected to one end of the coiled tubing 3. The logging drum 104 is used for winding and storing the coiled tubing 3. When the logging drum 104 rotates, it can drag the coiled tubing 3 to prevent the coiled tubing 3 from knotting. A slip ring 101 electrically connected to the cable 4 is provided at one end of the logging drum 104. The rated voltage of the slip ring 101 is 1200V, which can meet the high-power power supply requirements of the electric submersible pump 5, improve the quality and distance of signal transmission, reduce the signal-to-noise ratio of the signal, improve the quality and stability of signal transmission, and reduce the possibility of signal interference. The slip ring 101 is a joint device for transmitting signals and electricity. The slip ring 101 is used for transmitting power signals. The number of rings of the slip ring 101 is equal to the number of wire cores of the cable 4. The cable 4 includes 3 power cables and 2 communication cables respectively electrically connected to the slip ring 101. The number of rings of the slip ring 101 is 5 rings. The 3 power cables can achieve three-phase alternating current power supply, with higher power transmission. Because in a three-phase power system, electricity can be evenly distributed among the three phase lines, reducing the current and voltage of each line, thereby reducing the line loss and cost; because the waveform of three-phase electricity is continuous and stable, and the phase difference is fixed, it can reduce the voltage and current fluctuations, reduce power loss, and improve the stability of the circuit; because the electric submersible pump 5 is a three-phase motor, the torque is more uniform, which can better rotate the load, reduce energy loss, achieve higher efficiency, and make the system more reliable. Even if one phase line fails, the power supply of the other two phase lines can still ensure normal operation. The 2 communication cables can transmit more information, meet the needs of smooth signal transmission and real-time parameter adjustment, and transmit information such as logging data, production data, pipe string position, and sensor signals in a timely and rapid manner. At the same time, the 2 communication cables can also make the system more reliable and prevent a single communication cable failure from affecting production detection. Each ring of the slip ring 101 is respectively connected to the 3 power cables and 2 communication cables inside the cable 4 to prevent mutual interference. A leakage detection system 102 electrically connected to the slip ring 101 is provided on the logging drum support 103. The leakage detection system 102 is used to detect whether there is a leakage phenomenon. A grounding rod is provided on the logging drum support 103. One end of the grounding rod is electrically connected to the leakage detection system 102, and the other end of the grounding rod is in contact with the ground so that when there is a leakage, the current can flow safely back to the ground, avoiding the occurrence of electric shock accidents and effectively protecting the safety of personnel and equipment.

[0030] The driving unit is as follows: A drum motor 107 and a speed reducer 105 are provided on the drum bracket 103. The drum motor 107 is connected to the speed reducer 105 through chain drive by a chain 106. The output end of the drum motor 107 is connected to the logging drum 104. The drum motor 107 provides power for the logging drum 104 to drive the rotation of the logging drum 104, enabling the logging drum 104 to quickly lower and retrieve the logging tool 6. The speed reducer 105 is used to reduce the speed of the drum motor 107 and increase the torque, making the rotation of the logging drum 104 more stable. The chain 106 transmits the power of the drum motor 107 to the logging drum 104 to drive the logging drum 104 to rotate.

[0031] The working principle of this embodiment is as follows: The drum motor 107 drives the rotation of the logging drum 104. The logging drum 104 can stably lower and retrieve the coiled tubing 3, and drag the electric submersible pump 5 and the logging tool 6 connected to the coiled tubing 3. The logging tool 6 can measure the water content in the well to ensure the accuracy and reliability of obtaining the information of the water outlet point in the well. The electric submersible pump 5 is used to lift the liquid in the horizontal well to the ground. At the same time, in the state of dragging the electric submersible pump 5 and the logging tool 6, the slip ring 101 supplies power to the electric submersible pump 5 and the logging tool 6 through the cable 4 to ensure the logging operation.

[0032] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not deviate from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

1. A water finding device for coiled tubing in horizontal wells, characterized in that: It includes a transmission mechanism, a casing (2), a coiled tubing (3), a cable (4), an electrical submersible pump (5), and a logging tool (6). The transmission mechanism is located on the ground and is connected to one end of the casing (2). The casing (2) is fixed to the wellbore in a horizontal well. Inside the casing (2), there is a coiled tubing (3). Inside the coiled tubing (3), there is a cable (4) electrically connected to the transmission mechanism. Inside the coiled tubing (3), there is an electrical submersible pump (5) for lifting the liquid in the horizontal well to the ground. The electrical submersible pump (5) is electrically connected to the cable (4). Inside the coiled tubing (3), there is a logging tool (6) for testing the information of the water production point in the well. The logging tool (6) is electrically connected to the cable (4). The electrical submersible pump (5) and the logging tool (6) are located inside the coiled tubing (3).

2. The water finding device for coiled tubing in horizontal wells according to claim 1, wherein: The coiled tubing (3) and the cable (4) are of an integrally formed structure.

3. The water finding device for coiled tubing in horizontal wells according to claim 1, characterized in that: The cable (4) is a multi-core cable, and the multi-core cable is a 2-core cable or a 3-core cable or a 4-core cable or a 6-core cable or an 8-core cable.

4. The water finding device for coiled tubing in horizontal wells according to claim 1, characterized in that The transmission mechanism is as follows: A logging drum (104) electrically connected to the drive unit is provided on the drum support (103). The logging drum (104) is connected to one end of the coiled tubing (3). A slip ring (101) electrically connected to the cable (4) is provided at one end of the logging drum (104).

5. The water finding device for coiled tubing in horizontal wells according to claim 4, wherein: The number of rings of the slip ring (101) is equal to the number of wire cores of the cable (4).

6. The water finding device for coiled tubing in horizontal wells according to claim 4, characterized in that, The drive unit is as follows: A drum motor (107) and a reducer (105) are provided on the drum support (103). The drum motor (107) is connected to the reducer (105) through chain drive. The output end of the drum motor (107) is connected to the logging drum (104).

7. The water finding device for coiled tubing in horizontal wells according to claim 4, characterized in that: A leakage detection system (102) electrically connected to the slip ring (101) is provided on the drum support (103). A grounding rod is provided on the drum support (103). One end of the grounding rod is electrically connected to the leakage detection system (102), and the other end of the grounding rod is in contact with the ground.

8. The water finding device for coiled tubing in horizontal wells according to claim 1, characterized in that: One end of the coiled tubing (3) is connected to one end of a slip connector (9). The other end of the slip connector (9) is connected to one end of a cable fixator (8). The cable (4) passes through the inside of the slip connector (9) and the cable fixator (8). The cable (4) is fixedly connected to the cable fixator (8). A cable seal head (7) connected to the other end of the cable fixator (8) is provided at one end of the cable (4).

9. The water finding device for coiled tubing in horizontal wells according to claim 1, wherein: The logging tool (6) is a gamma ray logging tool or an absorption logging tool or an acoustic logging tool.

10. The water finding device for coiled tubing in horizontal wells according to claim 7, wherein: The diameter of the cable (4) is greater than 20 mm; the rated voltage of the slip ring (101) is 1200 V.

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