A double horizontal well core cable locking protection system and application method

Abstract

This invention belongs to the field of downhole drilling technology, and particularly relates to a locking and protection system and application method for a through-cable in a dual horizontal well. The dual horizontal well through-cable locking and protection system includes an injection well, a drilling rig, drill pipe strings, a locking and protection device, a navigation and conveying device, a through-cable, a data processor, and a magnetic guidance docking instrument. The drilling rig is installed at the wellhead of the injection well and is connected to the uppermost drill pipe string within the injection well. There are at least two drill pipe strings, and adjacent drill pipe strings are connected by a locking and protection device. The lowermost drill pipe string within the injection well is connected to the navigation and conveying device below it by the locking and protection device. To minimize wear on the through-cable, reduce tensile stress on the through-cable, allow for wider application in horizontal wells, and lower the failure risk factor, this invention provides a dual horizontal well through-cable locking and protection system and its application method.

Description

Technical Field

[0001] The invention belongs to the technical field of downhole drilling, and in particular relates to a double horizontal well core-penetrating cable locking protection system and an application method. Background Art

[0002] With the development of drilling technology in my country, dual horizontal wells are currently used for development in many energy fields, such as gasification coal mining and heavy oil development. The use of dual horizontal wells for development requires the spatial position of the two horizontal wells to be accurately controlled within a certain range. In order to achieve the purpose of precise control, during construction, we need to place magnetic guidance docking instruments and strong magnetic connectors in the injection well and production well respectively. The magnetic guidance docking instrument needs to be placed at the designated position of the injection well and connected to the ground equipment with a cable to transmit and process data. At present, this connection is mainly achieved by the method of through-core cable connection, that is, the magnetic guidance docking instrument is first fixed at the bottom of the drill bit, the cable is pre-passed through the drill bit, and connected to the magnetic guidance docking instrument, and the magnetic guidance docking instrument is sent to the predetermined position of the horizontal well through the accumulation of the drill bit. The cable is connected in sections of 50m by a special method.

[0003] This through-core cable connection method has obvious defects: 1. The cable is in irregular contact with the inner wall of the drill tool in the drill tool. When the drill tool is lifted, the cable cannot be fixed, which is easy to cause the outer skin of the cable to wear and cause a short circuit. 2. The through-core cable is connected in sections of 50m. When there are many cable interfaces, it is easy to cause the connection to be disconnected or virtual, resulting in the inability to transmit signals. 3. The force of this through-core cable is the top of the drill tool, and there is only one force point. The top of the through-core cable is subjected to a large tensile force, which is easy to tear or break the cable. 4. This through-core cable connection method has limitations and cannot be used in wells that are too deep in the horizontal well. The deeper the horizontal well, the longer the cable must be, and the greater the tensile force it bears. When the tensile force exceeds the tensile force that the cable itself can bear, the cable will be disconnected. 5. When the cable is disconnected for various reasons, the cable below the break point will fall to the bottom, causing entanglement and scrapping of the cable. Summary of the invention

[0004] The main purpose of the present invention is to solve the problems existing in the prior art. In order to make the through-hole cable less prone to wear, the through-hole cable withstands less tension, the application range of horizontal wells is larger and the failure risk factor is lower, the present invention provides a dual horizontal well through-hole cable locking protection system and application method.

[0005] The technical problem solved by the present invention is achieved by the following technical scheme: a locking protection system for a double horizontal well through-core cable, comprising an injection well, a drilling rig, a drill pipe column, a locking protection device, a navigation and conveying device, a through-core cable, a data processor and a magnetic guidance docking instrument, wherein a drilling rig is installed at the wellhead of the injection well, the drilling rig is connected to the uppermost drill pipe column in the injection well, the number of the drill pipe columns is at least two, and two adjacent drill pipe columns are connected by a locking protection device, the lowermost drill pipe column in the injection well is connected to the navigation and conveying device below it by a locking protection device, the upper end of the through-core cable is connected to the data processor in the drilling rig, and the lower end of the through-core cable passes through the drill pipe column and the locking protection device in sequence until it is connected to the magnetic guidance docking instrument in the navigation and conveying device;

[0006] The locking protection device includes a special mother joint, a locking screw, an automatically adjustable centering baffle and a locking rubber block. Two locking threaded holes are symmetrically arranged on the left and right sides of the special mother joint, and locking screws are installed in the locking threaded holes. An automatically adjustable centering baffle and a locking rubber block are placed inside the special mother joint, and the automatically adjustable centering baffle is located at the lower part of the locking rubber block. A through-core cable is arranged inside the special mother joint through the automatically adjustable centering baffle and the locking rubber block.

[0007] Furthermore, the length of the drill pipe column ranges from thirty meters to fifty meters; the length of the special mother joint is 0.5 meters, the outer diameter is 120 mm, the inner diameter of the upper end is 72 mm, and the inner diameter of the lower end is 60 mm.

[0008] Furthermore, threads are respectively provided at the upper and lower ends of the special mother joint, and the two adjacent drill pipe columns are connected by the threads at the upper and lower ends of the special mother joint in the locking protection device, and the lowest drill pipe column in the injection well is connected to the navigation and conveying device below it by the threads at the upper and lower ends of the special mother joint in the locking protection device.

[0009] Furthermore, the automatically adjustable centering baffle includes two semicircular baffles, the outer diameter of the automatically adjustable centering baffle is seventy millimeters and the thickness is eight millimeters, and a half-circular groove with a diameter of twelve millimeters is provided at the center of the automatically adjustable centering baffle.

[0010] Furthermore, the locking rubber block includes two semi-cylindrical rubber blocks, the outer diameter of the locking rubber block is 70 mm and the length is 20 mm, and a quarter-circular groove with a diameter of 8 mm is arranged at the center of the locking rubber block.

[0011] An application method of the above-mentioned dual horizontal well core cable locking protection system comprises the following steps:

[0012] Step 1: Place the required number of drill pipe columns on the ground in order and place a special mother joint between adjacent drill pipe columns, and pass the through-core cable through the arranged drill pipe columns and the special mother joint in sequence;

[0013] Step 2, fix the navigation conveying device at the wellhead of the injection well, install the magnetic guidance docking instrument into the navigation conveying device, connect the upper and lower ends of the through-core cable to the data processor and the magnetic guidance docking instrument respectively, and perform a signal transmission test on the through-core cable until the test is successful;

[0014] Step 3, install the locking protection device, step 31, connect the lower end of the special mother joint to the navigation conveying device; step 32, align the automatically adjustable center baffle with the through-core cable and close it to form a circular baffle, and put the automatically adjustable center baffle into the special mother joint; step 33, align the locking rubber block with the through-core cable and close it, and put the locking rubber block into the special mother joint; step 34, screw the locking screws into the locking threaded holes of the special mother joint to lock the through-core cable; step 35, connect the upper end of the special mother joint to the drill pipe column;

[0015] Step 4, the drilling rig is connected to the drill pipe column and drills in the injection well. Each drill pipe column is connected to its upper drill pipe column with a locking protection device, and the upper and lower ends of the dedicated mother joint of the locking protection device are respectively connected to the corresponding drill pipe columns. The locking protection device installation method of step 3 is repeated until the required number of drill pipe columns are lowered and the magnetic guide docking instrument is transported to the predetermined position.

[0016] Further, step 1, placing the required number of drill pipe columns in order on the ground and placing a special mother joint between adjacent drill pipe columns, further includes selecting the required number of drill pipe columns with a length ranging from thirty meters to fifty meters according to the predetermined position distance of the magnetic guidance docking instrument in the injection well, placing the required number of drill pipe columns in order on the ground and placing a special mother joint between adjacent drill pipe columns.

[0017] Further, step 31, connecting the lower end of the dedicated mother joint to the navigation conveying device, further includes connecting the lower end of the dedicated mother joint to the navigation conveying device through a thread;

[0018] Step 35, connecting the upper end of the special mother joint to the drill pipe column, further comprising connecting the upper end of the special mother joint to the drill pipe column through a thread;

[0019] Step 4, connecting the upper and lower ends of the special mother joint of the locking protection device to the corresponding drill pipe column respectively, further including connecting the upper and lower ends of the special mother joint of the locking protection device to the corresponding drill pipe column respectively through threads.

[0020] Further, step 32, aligning the automatically adjustable centering baffle with the through-core cable and closing it to form a circular baffle, and placing the automatically adjustable centering baffle into a dedicated mother connector, further includes aligning the two semicircular baffles of the automatically adjustable centering baffle with the through-core cable and closing them to form a circular baffle, and placing the automatically adjustable centering baffle into a dedicated mother connector.

[0021] Further, step 33, aligning the locking rubber block with the through-core cable and closing it, and placing the locking rubber block into the dedicated mother joint, further includes aligning the two semi-cylindrical rubber blocks of the locking rubber block with the through-core cable and closing it, and placing the locking rubber block into the dedicated mother joint.

[0022] The beneficial effects of the present invention are:

[0023] 1. The two adjacent drill pipe columns are connected by a locking protection device, the lowermost drill pipe column in the injection well is connected to the navigation and conveying device below it by a locking protection device, and a through-hole cable is arranged inside the special mother joint through an automatically adjustable centering baffle and a locking rubber block. It can be seen that the locking protection device is connected between the two adjacent drill pipe columns and between the drill pipe column and the navigation and conveying device, and the locking protection device automatically adjusts the centering baffle and the locking rubber block to lock the through-hole cable in the middle position of the locking protection device, so that the through-hole cable is automatically centered, reducing the contact between the through-hole cable and the inner wall of the drill pipe column, thereby effectively protecting the through-hole cable from wear, and making the through-hole cable not easy to wear.

[0024] 2. The two adjacent drill pipe columns are connected by a locking protection device, and the lowest drill pipe column in the injection well is connected to the navigation and transportation device below it by a locking protection device. It can be seen that locking protection devices are connected between the two adjacent drill pipe columns and between the drill pipe column and the navigation and transportation device, so that the single tension originally concentrated on the top of the through-hole cable is evenly distributed on each locking protection device, and each locking protection device only bears the weight of the cable from the locking protection device to the next locking protection device, which greatly reduces the tension borne by the through-hole cable itself, so that the through-hole cable bears less tension; because the through-hole cable bears less tension, the through-hole cable is not easily damaged or broken, and can be used in deeper horizontal wells, so that the horizontal well range of the present invention is larger.

[0025] 3. A through-hole cable is provided inside the special mother joint through an automatically adjustable centering baffle and a locking rubber block, and a locking screw is installed in the locking threaded hole. It can be seen that the automatically adjustable centering baffle and the locking rubber block inside the locking protection device lock the through-hole cable in the middle position of the locking protection device, and the locking screw is screwed into the locking threaded hole of the special mother joint to further lock and fix it. After locking the cable, no force will be applied to the through-hole cable connection joint, which greatly reduces the problem of virtual connection of the through-hole cable connection joint and reduces the risk factor of failure.

[0026] 4. When the through-hole cable breaks due to other reasons, under the action of the locking protection device, the through-hole cable will only fall to the next locking protection device, which will cause less damage to the through-hole cable after falling, and it is easier to handle the fault, reducing the risk factor of fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a schematic structural diagram of a double horizontal well core cable locking protection system.

[0028] Figure 2 It is a schematic structural diagram of the locking protection device of the present invention.

[0029] Figure 3 It is a structural schematic diagram of the special mother joint of the present invention.

[0030] Figure 4 It is a structural schematic diagram of the automatic adjustment centering baffle of the present invention.

[0031] Figure 5 It is a structural schematic diagram of the locking rubber block of the present invention.

[0032] Figure 6 The present invention is a schematic diagram of the magnetic guidance construction of a double horizontal well core cable locking protection system.

[0033] In the figure:

[0034] 1. Injection well 2. Drilling rig 3. Drill string

[0035] 4. Locking protection device 5. Navigation conveying device 6. Through-core cable

[0036] 7. Data processor 8. Magnetic guide docking instrument 9. Special female connector

[0037] 10. Locking screw 11. Automatically adjust the center baffle 12. Locking rubber block

[0038] 13. Locking threaded hole 14. Thread 15. Semicircular baffle

[0039] 16. Semi-cylindrical rubber block 17. Production well 18. Strong magnetic joint

[0040] 19. Drill DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] like Figure 1-Figure 6 As shown, a dual horizontal well through-core cable locking protection system provided by the present invention comprises an injection well 1, a drilling rig 2, a drill pipe column 3, a locking protection device 4, a navigation and transportation device 5, a through-core cable 6, a data processor 7 and a magnetic guidance docking instrument 8. A drilling rig 2 is installed at the wellhead of the injection well 1, and the drilling rig 2 is connected to the uppermost drill pipe column 3 in the injection well 1. The number of the drill pipe columns 3 is at least two, and two adjacent drill pipe columns 3 are connected through the locking protection device 4. The lowermost drill pipe column 3 in the injection well 1 is connected to the navigation and transportation device 5 below it through the locking protection device 4. The upper end of the through-core cable 6 is connected to the data processor 7 in the drilling rig 2, and the lower end of the through-core cable 6 passes through the drill pipe column 3 and the locking protection device 4 in sequence until it is connected to the magnetic guidance docking instrument 8 in the navigation and transportation device 5.

[0045] The locking protection device 4 includes a special mother joint 9, a locking screw 10, an automatically adjustable centering baffle 11 and a locking rubber block 12. Two locking threaded holes 13 are symmetrically arranged on the left and right sides of the special mother joint 9, and the locking screws 10 are installed in the locking threaded holes 13. The automatically adjustable centering baffle 11 and the locking rubber block 12 are placed inside the special mother joint 9, and the automatically adjustable centering baffle 11 is located at the lower part of the locking rubber block 12. A through-core cable 6 is arranged inside the special mother joint 9 through the automatically adjustable centering baffle 11 and the locking rubber block 12.

[0046] Among them, the locking threaded hole 13 on the special mother joint 9 has a diameter of eight millimeters, the distance between the two longitudinal locking threaded holes 13 on the special mother joint 9 is ten centimeters, the distance between the top of the special mother joint 9 and its lower locking threaded hole 13 is twenty centimeters, and the distance between the bottom of the special mother joint 9 and its upper locking threaded hole 13 is twenty centimeters. The special mother joint 9 is provided with two rows of four locking threaded holes 13 arranged symmetrically, and the locking rubber block 12 is pushed by the locking screw 10 to fix the through-core cable 6.

[0047] The locking screw 10 is 24 mm long and is divided into a threaded section and a non-threaded section, wherein the threaded section is 20 mm long and the thread outer diameter is 8 mm, and the non-threaded section is 4 mm long and the outer diameter is 6 mm. A 6 mm deep hexagonal notch is designed on the top of the locking screw 10, and a hexagonal wrench is used for locking.

[0048] The length of the drill pipe column 3 ranges from thirty meters to fifty meters; the length of the special mother joint 9 is 0.5 meters, the outer diameter is 120 mm, the inner diameter of the upper end is 72 mm, and the inner diameter of the lower end is 60 mm.

[0049] The upper and lower ends of the special mother joint 9 are respectively provided with threads 14, and the adjacent drill pipe columns 3 are connected through the threads 14 at the upper and lower ends of the special mother joint 9 in the locking protection device 4, and the lowermost drill pipe column 3 in the injection well 1 is connected to the navigation and conveying device 5 below it through the threads 14 at the upper and lower ends of the special mother joint 9 in the locking protection device 4.

[0050] The automatically adjustable centering baffle 11 includes two semicircular baffles 15. The outer diameter of the automatically adjustable centering baffle 11 is 70 mm and the thickness is 8 mm. A half-circular groove with a diameter of 12 mm is arranged at the center of the automatically adjustable centering baffle 11.

[0051] The locking rubber block 12 includes two semi-cylindrical rubber blocks 16, the outer diameter of the locking rubber block 12 is 70 mm, the length is 20 cm, and a quarter-circular groove with a diameter of 8 mm is arranged in the center of the locking rubber block 12. The locking protection device 4 uses a high-strength elastic locking rubber block 12 to squeeze the through-core cable 6 for locking. At the same time, the locking rubber block 12 is designed to be 20 cm long, which greatly increases the locking surface of the through-core cable 6 and the locking rubber block 12, which can effectively protect the through-core cable 6 and increase the locking torque during the locking process.

[0052] Example 1

[0053] The process of sending the magnetic guidance docking instrument 8 to the predetermined position: the magnetic guidance docking instrument 8 is installed and fixed in the navigation conveying device 5, and the locking protection device 4 is installed on the upper part of the navigation conveying device 5 through the thread 14. The locking protection device 4 is composed of a special mother joint 9, an automatic adjustment center baffle 11, a locking rubber block 12 and a locking screw 10; the upper end of the through-core cable 6 is connected to the data processor 7 in the drilling rig 2, and the lower end of the through-core cable 6 passes through the automatic adjustment center baffle 11 and the locking rubber block 12 in the middle position inside the locking protection device 4, and is connected to the magnetic guidance docking instrument 8 installed in the navigation conveying device 5; the upper part of the locking protection device 4 is connected to the drill column 3, and a locking protection device 4 is installed between the two drill columns 3 every 30-50 meters. After the drilling rig 2 connects the drill column 3 and the locking protection device 4, it drills one by one in sequence until the magnetic guidance docking instrument 8 is sent to the predetermined position according to the navigation. Among them,

[0054] The locking protection device 4 is composed of a special mother joint 9, an automatically adjustable centering baffle 11, a locking rubber block 12 and a locking screw 10, which are all independent components. Before installation, the through-core cable 6 needs to be passed through the special mother joint 9 in advance, connected to the drill column 3, and fixed to the drill plate surface. The inner diameter of the special mother joint 9 is a variable diameter, with an inner diameter of 72 mm at the upper end and 60 mm at the lower end, which can ensure that half of the automatically adjustable centering baffle 11 cannot fall into the drill column 3.

[0055] After fixing the special mother joint 9 on the drill plate surface, install the automatic adjusting centering baffle 11. During installation, you need to gently pull the through-core cable 6 by hand, and then divide the automatic adjusting centering baffle 11 into two semicircular baffles 15 to align and clamp the through-core cable 6 to form a circular baffle, so that the through-core cable 6 is located in the center of the automatic adjusting centering baffle 11, and put it into the special mother joint 9. The through-core cable 6 is automatically located in the center of the special mother joint 9 under the action of the automatic adjusting centering baffle 11.

[0056] The locking rubber block 12 is made of high-strength elastic rubber and has high extrudability. After installing the automatic adjustment centering baffle 11, install the locking rubber block 12. During installation, align the two semi-cylindrical rubber blocks 16 of the locking rubber block 12 to clamp the through-core cable 6, so that the through-core cable 6 is located in the center circular groove of the locking rubber block 12. Gently pull the through-core cable 6 by hand, and press the locking rubber block 12 into the dedicated mother connector 9.

[0057] The locking screw 10 is divided into a threaded section and a non-threaded section. The non-threaded section is mainly used to push the locking rubber block 12. After installing the locking rubber block 12, straighten the threaded cable 6 by hand, and then screw the locking screw 10 into the locking threaded hole 13 in turn to lock the threaded cable. After the locking is completed, check the locking effect, that is, release the hand holding the threaded cable, observe whether the threaded cable falls, and then pull it by hand to see whether the threaded cable 6 moves. If the locking is successful, perform the lower operation. If the locking effect is not good, increase the torque of the locking screw 10 or replace the locking rubber block 12 until the locking is successful.

[0058] The magnetic guidance construction process of production well 17 and injection well 1: Figure 6 As shown, a drill bit 19, a strong magnetic joint 18 and a drill pipe column 3 are lowered into the production well 17, and the strong magnetic joint 18 generates a magnetic line signal when rotating. A navigation and conveying device 5, a drill pipe column 3 and a locking protection device 4 are lowered into the injection well 1, and the magnetic guidance docking instrument 8 and the data processor 7 in the navigation and conveying device 5 are connected through a through-core cable 6 to transmit communication signals. The magnetic guidance docking instrument 8 transmits the magnetic line signal generated by the strong magnetic joint 18 in the production well 17 to the data processor 7 for decoding and calculation to obtain a signal instruction. The drill bit 19 of the production well 17 continues to drill according to the signal instruction of the magnetic guidance docking instrument 8 until the drill bit 19 of the production well 17 drills to the predetermined position of the magnetic guidance docking instrument 8 to connect the production well 17 and the injection well 1.

[0059] An application method of the above dual horizontal well core cable locking protection system comprises the following steps:

[0060] Step 1: Arrange and place the required number of drill rod columns 3 on the ground and place a special mother joint 9 between adjacent drill rod columns 3, and pass the through-core cable 6 through the arranged drill rod columns 3 and the special mother joint 9 in sequence.

[0061] Among them, step 1, placing the required number of drill pipe columns 3 in order on the ground and placing a special mother joint 9 between adjacent drill pipe columns 3, further includes, according to the predetermined position distance transported by the magnetic guidance docking instrument 8 in the injection well 1, selecting the required number of drill pipe columns 3 with a length ranging from thirty meters to fifty meters, placing the required number of drill pipe columns 3 in order on the ground and placing a special mother joint 9 between adjacent drill pipe columns 3.

[0062] Step 2: Fix the navigation and conveying device 5 at the wellhead of the injection well 1, and install the magnetic guidance docking instrument 8 into the navigation and conveying device 5, connect the upper and lower ends of the through-core cable 6 to the data processor 7 and the magnetic guidance docking instrument 8 respectively, and perform a signal transmission test on the through-core cable 6 until the test is successful.

[0063] Step 3, install the locking protection device 4, step 31, connect the lower end of the special mother joint 9 to the navigation conveying device 5; step 32, align the automatic adjusting center baffle 11 with the through-hole cable 6 and close it to form a circular baffle, and put the automatic adjusting center baffle 11 into the special mother joint 9; step 33, align the locking rubber block 12 with the through-hole cable 6 and close it, and put the locking rubber block 12 into the special mother joint 9; step 34, screw the locking screws 10 into the locking threaded holes 13 of the special mother joint 9 to lock the through-hole cable 6; step 35, connect the upper end of the special mother joint 9 to the drill pipe column 3.

[0064] Among them, step 31, connect the lower end of the special mother connector 9 to the navigation conveying device 5, lift the special mother connector and the through-core cable 6 together and connect them to the navigation conveying device 5, and after the connection is completed, straighten the through-core cable 6 by hand; step 32, align the automatic adjusting centering baffle 11 with the through-core cable 6 to form a circular baffle, and put the automatic adjusting centering baffle 11 into the special mother connector 9. Under the action of the automatic adjusting centering baffle 11, the through-core cable 6 is automatically located at the center of the special mother connector 9, and then gently straighten the cable; step 33, align the locking rubber block 12 with the through-core cable 6 Close the cable 6 and put the locking rubber block 12 into the special mother connector 9. Put it in slowly and observe whether the through-hole cable 6 is located in the center of the locking rubber block 12. Step 34: Screw the locking screws 10 into the locking threaded holes 13 of the special mother connector 9 to lock the through-hole cable 6. Use a hexagonal wrench to screw the locking screws 10 into the locking threaded holes 13 for locking. During the locking process, gently pull the through-hole cable 6 with your hand. After the locking is completed, let the through-hole cable 6 be in an automatic vertical state, observe whether the through-hole cable 6 automatically descends, and check whether it is locked in place.

[0065] Among them, step 31, connecting the lower end of the special mother joint 9 to the navigation conveying device 5, further includes connecting the lower end of the special mother joint 9 to the navigation conveying device 5 through the thread 14; step 35, connecting the upper end of the special mother joint 9 to the drill pipe column 3, further includes connecting the upper end of the special mother joint 9 to the drill pipe column 3 through the thread 14.

[0066] Among them, step 32, aligning the automatic adjusting center baffle 11 with the through-core cable 6 and closing it to form a circular baffle, and placing the automatic adjusting center baffle 11 into the dedicated mother connector 9, further includes aligning the two semicircular baffles 15 of the automatic adjusting center baffle 11 with the through-core cable 6 and closing them to form a circular baffle, and placing the automatic adjusting center baffle 11 into the dedicated mother connector 9.

[0067] Among them, step 33, aligning the locking rubber block 12 with the through-core cable 6 and closing it, and placing the locking rubber block 12 into the dedicated mother joint 9, further includes aligning the two semi-cylindrical rubber blocks 16 of the locking rubber block 12 with the through-core cable 6 and closing it, and placing the locking rubber block 12 into the dedicated mother joint 9.

[0068] Step 4, the drilling rig 2 is connected to the drill pipe column 3 and drills in the injection well 1. Each drill pipe column 3 is connected to a locking protection device 4 on its upper drill pipe column 3, and the upper and lower ends of the dedicated mother joint 9 of the locking protection device 4 are respectively connected to the corresponding drill pipe column 3. The locking protection device 4 installation method of step 3 is repeated until the required number of drill pipe columns 3 are lowered and the magnetic guide docking instrument 8 is transported to the predetermined position.

[0069] Among them, step 4, and connecting the upper and lower ends of the dedicated mother joint 9 of the locking protection device 4 to the corresponding drill rod column 3, further includes, and connecting the upper and lower ends of the dedicated mother joint 9 of the locking protection device 4 to the corresponding drill rod column 3 through threads 14.

[0070] Example 2

[0071] The specific construction method of the double horizontal well core cable locking protection system is as follows:

[0072] 1. First, the injection well 1 is constructed according to the design, and the casing and the 11-meter fiberglass screen are lowered. The 11-meter fiberglass screen is lowered to the bottom of the well as the target point for magnetic guidance docking, that is, the placement position of the navigation conveying device 5 at the bottom of the well.

[0073] 2. When the remaining depth of the production well 17 from the injection well 1 is 100 meters, stop drilling, pull out the drill and lower the strong magnetic joint 18, and at the same time lower the magnetic guidance docking instrument 8 into the injection well 1.

[0074] 3. When lowering the magnetic guidance docking instrument 8, first fix the navigation conveying device 5 on the turntable surface, and install the magnetic guidance docking instrument 8 in the navigation conveying device 5. Pass the through-core cable 6 through the drill pipe column 3 and the special mother joint 9, and connect the upper and lower ends of the through-core cable 6 to the data processor 7 and the magnetic guidance docking instrument 8 respectively. After testing the instrument to be normal, connect the lower end of the special mother joint 9 to the navigation conveying device 5. When connecting, gently pull the through-core cable 6 by hand, then install the automatic adjustment centering baffle 11, and then install the locking rubber block 12. Finally, use the locking screws 10 to lock the through-core cable 6 in turn. After releasing the hand, there is no phenomenon of the threading cable falling, etc., which determines that the locking is successful. The lower end of the special mother joint 9 is connected to the drill pipe column 3, and the drilling rig 2 is connected to the drill pipe column 3 to start drilling. A locking protection device 4 is added every 50 meters of the drill pipe column 3 until the navigation conveying device 5 is lowered to 923 meters.

[0075] 4. The drilling rig 2 is started at the production well 17, and the magnetic guidance docking instrument 8 transmits the magnetic line signal generated by the strong magnetic joint 18 in the production well 17 to the data processor 7, which performs decoding calculation to obtain the signal instruction. The drill bit 19 on the drilling rig 2 of the production well 17 continues to drill according to the signal instruction of the magnetic guidance docking instrument 8, until the drill bit 19 of the production well 17 reaches the target point of the magnetic guidance docking instrument 8, and the production well 17 and the injection well 1 are successfully docked. During the construction process, the through-core cable 6 does not wear out, and there is no interruption in the transmission signal, etc., and a good effect is achieved.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An application method of a locking protection system for a dual horizontal well through-core cable, the locking protection system for the dual horizontal well through-core cable comprising an injection well, a drilling rig, a drill pipe column, a locking protection device, a navigation and conveying device, a through-core cable, a data processor and a magnetic guidance docking instrument, a drilling rig is installed at the wellhead of the injection well, the drilling rig is connected to the uppermost drill pipe column in the injection well, the number of the drill pipe columns is at least two, two adjacent drill pipe columns are connected by a locking protection device, the lowermost drill pipe column in the injection well is connected to the navigation and conveying device below it by a locking protection device, the upper end of the through-core cable is connected to the data processor in the drilling rig, and the lower end of the through-core cable passes through the drill pipe column and the locking protection device in sequence until it is connected to the magnetic guidance docking instrument in the navigation and conveying device; The locking protection device comprises a special mother joint, a locking screw, an automatically adjustable centering baffle and a locking rubber block, two locking threaded holes are symmetrically arranged on the left and right sides of the special mother joint, locking screws are installed in the locking threaded holes, an automatically adjustable centering baffle and a locking rubber block are placed inside the special mother joint, and the automatically adjustable centering baffle is located at the lower part of the locking rubber block, and a through-core cable is arranged inside the special mother joint through the automatically adjustable centering baffle and the locking rubber block, characterized in that: The following steps are involved: Step 1: Place the required number of drill pipe columns on the ground in order and place a special mother joint between adjacent drill pipe columns, and pass the through-core cable through the arranged drill pipe columns and the special mother joint in sequence; Step 2, fix the navigation conveying device at the wellhead of the injection well, install the magnetic guidance docking instrument into the navigation conveying device, connect the upper and lower ends of the through-hole cable to the data processor and the magnetic guidance docking instrument respectively, and perform a signal transmission test on the through-hole cable until the test is successful; Step 3, install the locking protection device, step 31, connect the lower end of the special mother joint to the navigation conveying device; step 32, align the automatically adjustable center baffle with the through-core cable to form a circular baffle, and put the automatically adjustable center baffle into the special mother joint; step 33, align the locking rubber block with the through-core cable and close it, and put the locking rubber block into the special mother joint; step 34, screw the locking screws into the locking threaded holes of the special mother joint to lock the through-core cable; step 35, connect the upper end of the special mother joint to the drill pipe column; Step 4, the drilling rig is connected to the drill pipe column and drills in the injection well. Each drill pipe column is connected to its upper drill pipe column with a locking protection device, and the upper and lower ends of the dedicated mother joint of the locking protection device are respectively connected to the corresponding drill pipe columns. The locking protection device installation method of step 3 is repeated until the required number of drill pipe columns are lowered and the magnetic guide docking instrument is transported to the predetermined position.

2. The application method of the double horizontal well core cable locking protection system according to claim 1 is characterized in that: Step 1, sorting and placing the required number of drill pipe columns on the ground and placing a special mother joint between adjacent drill pipe columns, further comprising, according to the predetermined position distance of the magnetic guidance docking instrument in the injection well, selecting the required number of drill pipe columns with a length ranging from thirty meters to fifty meters, sorting and placing the required number of drill pipe columns on the ground and placing a special mother joint between adjacent drill pipe columns.

3. The application method of the double horizontal well core cable locking protection system according to claim 1 is characterized in that: Step 31, connecting the lower end of the dedicated mother joint to the navigation conveying device, further comprising connecting the lower end of the dedicated mother joint to the navigation conveying device through a thread; Step 35, connecting the upper end of the special mother joint to the drill pipe column, further comprising connecting the upper end of the special mother joint to the drill pipe column through a thread; Step 4, connecting the upper and lower ends of the special mother joint of the locking protection device to the corresponding drill pipe column respectively, further including connecting the upper and lower ends of the special mother joint of the locking protection device to the corresponding drill pipe column respectively through threads.

4. The application method of the double horizontal well core cable locking protection system according to claim 1 is characterized in that: Step 32, align the automatically adjustable center baffle with the through-hole cable and close it to form a circular baffle, and place the automatically adjustable center baffle into the dedicated mother connector, further including aligning the two semicircular baffles of the automatically adjustable center baffle with the through-hole cable and closing them to form a circular baffle, and placing the automatically adjustable center baffle into the dedicated mother connector.

5. The application method of the double horizontal well core cable locking protection system according to claim 1 is characterized in that: Step 33, aligning the locking rubber block with the through-hole cable and closing it, and placing the locking rubber block into the dedicated mother joint, further includes aligning the two semi-cylindrical rubber blocks of the locking rubber block with the through-hole cable and closing it, and placing the locking rubber block into the dedicated mother joint.

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