A high-temperature salt well directional well docking navigation and transportation system and application method

Abstract

The present invention belongs to the technical field of high-temperature salt well directional well docking, and in particular, relates to a high-temperature salt well directional well docking navigation and transportation system and an application method. The high-temperature salt well directional well docking navigation and transportation system includes a directional well, a drilling rig, a drill pipe column, a non-magnetic drill collar, a navigation and transportation device, a high-temperature salt well cavity, a magnetic guidance docking instrument, a cable and a winch. The directional well is equipped with a drilling rig at the wellhead, and a drill pipe column is arranged inside the directional well. The upper end of the drill pipe column is connected to the drilling rig, and the non-magnetic drill collar at the lower end of the drill pipe column is connected to the navigation and transportation device, and the navigation and transportation device is placed at the center of the high-temperature salt well cavity. In order to enable the magnetic guidance docking instrument to be safely lowered into and pulled out of the high-temperature salt well cavity to improve the safety and stability of the construction, and to enable the docking instrument to be located at the center of the high-temperature salt well cavity to ensure the accuracy of receiving the docking signal, the present invention provides a high-temperature salt well directional well docking navigation and transportation system and an application method.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-temperature salt well directional well docking, and in particular relates to a high-temperature salt well directional well docking navigation and transportation system and an application method. Background Art

[0002] With the development of my country's chemical industry, the demand for chemical raw materials such as polyvinyl chloride, caustic soda, and hydrochloric acid has increased significantly, prompting the vigorous development of salt mines. At present, salt mining is mainly carried out by water dissolution, that is, "horizontal well + vertical well". After the horizontal well and the vertical well are connected, saturated brine is injected from the horizontal well, and brine is extracted from the vertical well. This requires two sites, which causes problems such as high cost, more land occupation, and inconvenient management. It is also restricted by objective reasons such as terrain and ground buildings. To solve these problems, it is necessary to place the water injection well and the brine extraction well in the same site, which requires the vertical well to be changed to a directional well.

[0003] After the vertical well was changed to a directional well, some problems arose in the process of connecting the two wells. How to safely lower the connecting probe to the predetermined position, remove it smoothly, and ensure the accuracy of the connection data? At present, the probe is mainly sent to the predetermined position by direct cable transportation. The "horizontal well + vertical well" model can be easily achieved under the action of gravity, but the "horizontal well + directional well" model has the following problems:

[0004] 1. The instrument is light in weight and is easily blocked in the inclined well section, and cannot reach the predetermined cavity. 2. Directional wells form irregular cavities in the salt layer through water dissolution. There are often small salt layers on the top of the target salt layer, and caves will also be formed when water dissolves and forms cavities. There are often non-salty interlayers in the target salt layer. When water dissolves and forms cavities, these interlayers cannot be dissolved, forming suspended layers. The connecting probe will encounter obstacles when it goes down to these places under its own weight. 3. Directional wells have a certain inclination. Even if the connecting instrument can smoothly enter the target cavity, the instrument is in a suspended state in the cavity under the influence of gravity and is at the bottom of the cavity. It cannot be centered, causing deviations in the connection data. When preparing to pull out the instrument, it may get stuck, causing the instrument to fall into the well. 4. The target layer of high-temperature salt wells is often deep, and crystallization or solid accumulation is prone to occur. When the connecting instrument is difficult to lower or encounters obstacles, the pump cannot be turned on for circulation. 5. If the salt layer collapses when the instrument is in the cavity, it is easy to bury the docking instrument in the cavity, causing an accident. Summary of the invention

[0005] The main purpose of the present invention is to solve the problems existing in the prior art. In order to enable the magnetic guidance docking instrument to be safely lowered into and pulled out of the high-temperature salt well cavity to improve the construction safety and stability, the docking instrument can be located at the center of the high-temperature salt well cavity to ensure the accuracy of receiving the docking signal. The present invention provides a high-temperature salt well directional well docking navigation and transportation system and an application method.

[0006] The technical problem solved by the present invention is achieved by adopting the following technical scheme: a high-temperature salt well directional well docking navigation and transportation system, comprising a directional well, a drilling rig, a drill pipe column, a non-magnetic drill collar, a navigation and transportation device, a high-temperature salt well dissolution cavity, a magnetic guidance docking instrument, a cable and a winch, wherein the directional well is equipped with a drilling rig at the wellhead, a drill pipe column is arranged inside the directional well, the upper end of the drill pipe column is connected to the drilling rig, the non-magnetic drill collar at the lower end of the drill pipe column is connected to the navigation and transportation device, the navigation and transportation device is placed at the center of the high-temperature salt well dissolution cavity, the magnetic guidance docking instrument in the navigation and transportation device is connected to the lower end of the cable, and the upper end of the cable passes through the non-magnetic drill collar and the drill pipe column in sequence and is connected to the winch;

[0007] The navigation and conveying device is provided with a sitting and hanging assembly, a one-way flow assembly and a deflection guide assembly in sequence from top to bottom. The upper part of the sitting and hanging assembly is connected to the non-magnetic drill collar at the lower end of the drill pipe column. A sitting and hanging sleeve is installed inside the sitting and hanging assembly. A magnetic guide docking instrument is placed in the sitting and hanging sleeve. The cavity of the sitting and hanging assembly is communicated with the cavity of the one-way flow assembly. A partition is provided between the cavity of the one-way flow assembly and the cavity of the deflection guide assembly. A through hole is opened on the partition. A spring return pressure sleeve is installed in the middle of the partition and the spring return pressure sleeve is located in the cavity of the one-way flow assembly. The lower part of the deflection guide assembly is provided with an injection hole.

[0008] Furthermore, through holes are symmetrically opened on the partitions on the left and right sides of the spring return pressure sleeve.

[0009] Furthermore, the lower end of the deflection guide assembly is in a cone shape, and the outer surface of the deflection guide assembly is evenly inlaid with hard and wear-resistant alloy blocks.

[0010] Furthermore, a threaded female buckle is provided on the upper part of the hanging assembly, and the upper part of the hanging assembly is threadedly connected to the non-magnetic drill collar at the lower end of the drill pipe column through the female buckle, and a hanging sleeve is installed inside the hanging assembly through a top screw.

[0011] Furthermore, the deflection guide assembly is provided with three injection hole groups at equal intervals from bottom to top, and each of the injection hole groups includes four evenly distributed injection holes.

[0012] An application method of the high-temperature salt well directional well docking navigation and transportation system as described above comprises the following steps:

[0013] Step 1, connect the upper end of the drill string to the drilling rig, and connect the non-magnetic drill collar at the lower end of the drill string to the navigation conveying device;

[0014] Step 2, start the drilling rig, lower the drill string, the non-magnetic drill collar and the navigation conveying device into the directional well. If the navigation conveying device encounters an obstacle during the lowering process, execute step 21; if the navigation conveying device is lowered smoothly, execute step 3;

[0015] Step 3, adjust the length of the drill column and the non-magnetic drill collar so that the navigation and transportation device is located at the center of the high-temperature salt well cavity; the drilling rig pumps in saturated brine, and the saturated brine enters the cavity of the seating assembly of the navigation and transportation device along the inner holes of the drill column and the non-magnetic drill collar, the pressure of the saturated brine in the cavity of the seating assembly causes the spring of the spring back pressure sleeve in the one-way flow assembly to contract, and the cavity of the one-way flow assembly is opened, and the saturated brine in the cavity of the seating assembly enters the cavity of the one-way flow assembly, and the saturated brine in the cavity of the one-way flow assembly enters the cavity of the guide assembly through the through hole on the partition, and is ejected through the lower injection hole of the guide assembly, so that impurities in the drill column, the non-magnetic drill collar and the navigation and transportation device are discharged; the drilling rig is shut down to stop pumping in saturated brine, and the pressure of the saturated brine in the cavity of the seating assembly disappears, causing the spring of the spring back pressure sleeve in the one-way flow assembly to stretch, and the cavity of the one-way flow assembly is closed;

[0016] Step 4, start the winch, the cable on the winch transports the magnetic guidance docking instrument along the inner hole of the drill pipe column and the non-magnetic drill collar to the sitting and hanging assembly of the navigation and transportation device, and close the winch;

[0017] Step 5: The magnetic guidance docking instrument guides the drill bit in the horizontal well to drill according to the magnetic line signal sent by the strong magnetic joint in the horizontal well, until the horizontal well and the directional well are successfully docked and connected;

[0018] Step 6, start the winch, the cable on the winch pulls the magnetically guided docking instrument out from the sitting and hanging assembly of the navigation conveying device along the inner hole of the drill pipe column and the non-magnetic drill collar, and close the winch;

[0019] Step 7: Start the drilling rig, remove the drill string, non-magnetic drill collar and navigation conveying device from the directional well, and shut down the drilling rig.

[0020] Further, in step 21, the drilling rig pumps in saturated brine, which enters the cavity of the seating assembly of the navigation and conveying device along the inner holes of the drill pipe column and the non-magnetic drill collar, and the pressure of the saturated brine in the cavity of the seating assembly causes the spring of the spring back pressure sleeve in the one-way flow assembly to contract, thereby opening the cavity of the one-way flow assembly, and the saturated brine in the cavity of the seating assembly enters the cavity of the one-way flow assembly, and the saturated brine in the cavity of the one-way flow assembly enters the cavity of the guiding assembly through the through hole on the partition, and is ejected through the lower injection hole of the guiding assembly, and the saturated brine ejected from the injection hole generates hydraulic shock to break up the obstructed rock cuttings and blocks, and discharge them out of the directional well. If the navigation and conveying device still encounters obstruction during the lowering process, step 22 is executed, and if the lowering process of the navigation and conveying device is smooth, step 3 is executed.

[0021] Further, in step 22, the drilling rig rotates the drill pipe column and the non-magnetic drill collar at a low speed, driving the navigation and conveying device to rotate and remove the blocked rock cuttings and loose pieces. The drilling rig then gradually increases the rotation speed of the drill pipe column and the non-magnetic drill collar, driving the hard wear-resistant alloy blocks on the surface of the guide assembly of the navigation and conveying device to rotate at a high speed to crush the rock cuttings and loose pieces, and discharge them out of the directional well, and continue to execute step 3.

[0022] Further, step 1, connecting the upper end of the drill pipe column to the drilling rig, and connecting the non-magnetic drill collar at the lower end of the drill pipe column to the navigation and transportation device, further includes connecting the upper end of the drill pipe column to the drilling rig, and threading the non-magnetic drill collar at the lower end of the drill pipe column to the female buckle of the hanging assembly of the navigation and transportation device.

[0023] Further, step 3, adjusting the length of the drill string and the non-magnetic drill collar so that the navigation and transportation device is located at the center of the high-temperature salt well cavity, further includes: after adjusting the length of the drill string and the non-magnetic drill collar so that the navigation and transportation device is located at the center of the high-temperature salt well cavity, if the salt layer of the high-temperature salt well collapses, the drilling rig pumps saturated brine, and the saturated brine enters the cavity of the seating assembly of the navigation and transportation device along the inner holes of the drill string and the non-magnetic drill collar, the pressure of the saturated brine in the cavity of the seating assembly causes the spring of the spring back pressure sleeve in the one-way flow assembly to contract, opening the cavity of the one-way flow assembly, the saturated brine in the cavity of the seating assembly enters the cavity of the one-way flow assembly, the saturated brine in the cavity of the one-way flow assembly enters the cavity of the guide assembly through the through hole on the partition, and is ejected through the lower injection hole of the guide assembly, the ejected saturated brine dilutes the collapsed part of the dissolved salt layer, and is discharged from the wellhead of the high-temperature salt well.

[0024] The beneficial effects of the present invention are:

[0025] 1. The non-magnetic drill collar at the lower end of the drill pipe column is connected to the navigation and transportation device, which is placed in the center of the high-temperature salt well cavity. A magnetic guidance docking instrument is placed in the hanging sleeve of the hanging assembly on the navigation and transportation device. It can be seen that the upper part of the navigation and transportation device is rigidly supported by the drill pipe column and the non-magnetic drill collar and is located in the center of the high-temperature salt well cavity. Moreover, the magnetic guidance docking instrument is placed in the hanging assembly and is also located in the center of the high-temperature salt well cavity, so that the accuracy of receiving the docking signal is high. Since the weight of the non-magnetic drill collar and the drill pipe column is as high as tens of tons, the magnetic guidance docking instrument in the hanging assembly is minimally affected by external vibration, which can also make the accuracy of receiving the docking signal high, grasp the precise parameters of the high-temperature salt well cavity, and achieve the purpose of precise docking.

[0026] 2. The lower end of the cable of the magnetic guidance docking instrument in the navigation and transportation device is connected, and the upper end of the cable passes through the non-magnetic drill collar, the drill pipe column and the winch in turn. It can be seen that the magnetic guidance docking instrument is transported to the navigation and transportation device through the cable on the winch along the inner hole of the drill pipe column and the non-magnetic drill collar. Since the inner hole sizes of the drill pipe column and the non-magnetic drill collar are the same, the magnetic guidance docking instrument will not get stuck during the lowering and pulling out process, so that the magnetic guidance docking instrument can be safely lowered into and pulled out of the high-temperature salt well dissolution cavity, improving the safety and stability of the construction. If the cable breaks, the magnetic guidance docking instrument will fall into the navigation and transportation device instead of falling into the directional well to cause an accident.

[0027] 3. The drilling rig can pump saturated brine into the cavity of the seating assembly of the navigation and conveying device along the inner holes of the drill pipe column and the non-magnetic drill collar. The pressure of the saturated brine in the cavity of the seating assembly causes the spring of the spring back pressure sleeve in the one-way flow assembly to contract, opening the cavity of the one-way flow assembly. The saturated brine in the cavity of the seating assembly enters the cavity of the one-way flow assembly. The saturated brine in the cavity of the one-way flow assembly enters the cavity of the guide and deflection assembly through the through hole on the partition, and is ejected through the lower injection hole of the guide and deflection assembly to discharge impurities inside the drill pipe column, the non-magnetic drill collar and the navigation and conveying device, ensuring that the inner holes of the drill pipe column and the non-magnetic drill collar form a smooth channel, which is convenient for the transportation of the magnetic guidance docking instrument, providing a guarantee for the safe lowering and extraction of the magnetic guidance docking instrument into and out of the high-temperature salt well dissolution cavity, and improving the safety and stability of construction.

[0028] 4. The navigation and conveying device is equipped with a one-way flow assembly. Saturated brine can only flow in one direction. The cuttings in the well cannot enter the inner hole of the non-magnetic drill collar and the drill pipe column through the injection hole on the guide and deflection assembly. This avoids encountering obstructions in the non-magnetic drill collar and the drill pipe column when conveying the magnetic guidance docking instrument, provides a guarantee for the safe lowering and extraction of the magnetic guidance docking instrument into the high-temperature salt well cavity, and improves the safety and stability of the construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a high-temperature salt well directional well docking navigation and transportation system of the present invention.

[0030] Figure 2 It is a schematic diagram of the structure of the navigation conveying device of the present invention.

[0031] Figure 3 It is a schematic diagram of the docking construction of a high-temperature salt well directional well docking navigation and transportation system of the present invention.

[0032] In the figure:

[0033] 1. Directional well 2. Drilling rig 3. Drill string

[0034] 4. Non-magnetic drill collar 5. Navigation and transportation device 6. High-temperature salt well cavity

[0035] 7. Magnetic guide docking instrument 8. Cable 9. Winch

[0036] 10. Seat and suspension assembly 11. One-way flow assembly 12. Guide and tilt assembly

[0037] 13. Hanging sleeve 14. Partition plate 15. Through hole

[0038] 16. Spring return sleeve 17. Injection hole 18. Hard wear-resistant alloy block

[0039] 19, female buckle 20, top screw 21, horizontal well

[0040] 22. Strong magnetic connector 23. Drill bit 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 3As shown, a high-temperature salt well directional well docking navigation and transportation system provided by the present invention comprises a directional well 1, a drilling rig 2, a drill pipe column 3, a non-magnetic drill collar 4, a navigation and transportation device 5, a high-temperature salt well cavity 6, a magnetic guidance docking instrument 7, a cable 8 and a winch 9. The drilling rig 2 is installed at the wellhead of the directional well 1, and a drill pipe column 3 is arranged inside the directional well 1. The upper end of the drill pipe column 3 is connected to the drilling rig 2, and the non-magnetic drill collar 4 at the lower end of the drill pipe column 3 is connected to the navigation and transportation device 5. The navigation and transportation device 5 is placed at the center of the high-temperature salt well cavity 6. The magnetic guidance docking instrument 7 in the navigation and transportation device 5 is connected to the lower end of the cable 8, and the upper end of the cable 8 passes through the non-magnetic drill collar 4 and the drill pipe column 3 in sequence and is connected to the winch 9.

[0045] The navigation and conveying device 5 is provided with a seating assembly 10, a one-way flow assembly 11 and a deflection guide assembly 12 in sequence from top to bottom. The upper part of the seating assembly 10 is connected to the non-magnetic drill collar 4 at the lower end of the drill pipe column 3. A seating sleeve 13 is installed inside the seating assembly 10. A magnetic guide docking instrument 7 is placed in the seating sleeve 13. The cavity of the seating assembly 10 is communicated with the cavity of the one-way flow assembly 11. A partition 14 is provided between the cavity of the one-way flow assembly 11 and the cavity of the deflection guide assembly 12. A through hole 15 is opened on the partition 14. A spring return pressure sleeve 16 is installed in the middle of the partition 14 and the spring return pressure sleeve 16 is located in the cavity of the one-way flow assembly 11. An injection hole 17 is opened at the lower part of the deflection guide assembly 12.

[0046] Through holes 15 are symmetrically formed on the partition plates 14 on the left and right sides of the spring return sleeve 16 .

[0047] The lower end of the guide assembly 12 is in the shape of a cone, and the outer surface of the guide assembly 12 is evenly inlaid with hard wear-resistant alloy blocks 18. Among them, the lower end of the guide assembly 12 is in the shape of a cone and the cone has an 18-degree guide angle, which reduces the friction with the salt well wall during the process of lifting and lowering the drill pipe. The outer diameter of the navigation conveying device 5 is 120 mm. Under the drive of the ground drilling rig 2, the hard wear-resistant alloy block 18 can effectively push away or crush the fallen blocks and rock cuttings, change the position and state of the fallen blocks and rock cuttings, and effectively discharge the fallen blocks or rock cuttings out of the directional well 1.

[0048] A threaded box buckle 19 is provided on the upper part of the hanging assembly 10, and the upper part of the hanging assembly 10 is threadedly connected to the non-magnetic drill collar 4 at the lower end of the drill pipe column 3 through the box buckle 19, and a hanging sleeve 13 is installed inside the hanging assembly 10 through a top screw 20.

[0049] The guide assembly 12 is provided with three groups of injection holes 17 at equal intervals from bottom to top, and each group of injection holes 17 includes four evenly distributed injection holes 17. The diameter of each injection hole 17 is about five millimeters. The injection holes 17 are mainly used to discharge saturated brine and debris in the inner hole of the drill string 3, and can also generate hydraulic impact to break up the blocks and cuttings in the wellbore and discharge them out of the well.

[0050] Example 1

[0051] First, the drilling rig 2 lowers the drill pipe column 3, the non-magnetic drill collar 4 and the navigation and transportation device 5 into the directional well 1, and adjusts the length of the drill pipe column 3 and the non-magnetic drill collar 4 so that the navigation and transportation device 5 is located at the center of the high-temperature salt well cavity 6, so that the magnetic guidance docking instrument 7 is also located at the geometric center of the high-temperature salt well cavity 6 after being installed, which is beneficial to improving the success rate of high-temperature salt well docking.

[0052] Secondly, the drilling rig 2 pumps saturated salt water, and the saturated salt water enters the cavity of the hanging assembly 10 of the navigation and conveying device 5 along the inner hole of the drill pipe column 3 and the non-magnetic drill collar 4. The pressure of the saturated salt water in the cavity of the hanging assembly 10 causes the spring of the spring back pressure sleeve 16 in the one-way flow assembly 11 to contract, opening the cavity of the one-way flow assembly 11. The saturated salt water in the cavity of the hanging assembly 10 enters the cavity of the one-way flow assembly 11. The saturated salt water in the cavity of the one-way flow assembly 11 enters the cavity of the guide assembly 12 through the through hole 15 on the partition 14, and is sprayed out through the lower part of the guide assembly 12. The perforations 17 are sprayed to discharge the impurities inside the drill string 3, the non-magnetic drill collar 4 and the navigation conveying device 5; the drilling rig 2 is shut down to stop pumping in saturated brine, and the pressure of the saturated brine in the cavity of the seating assembly 10 disappears, causing the spring of the spring back pressure sleeve 16 in the one-way flow assembly 11 to stretch, and the cavity of the one-way flow assembly 11 is closed, so that the debris in the well cannot return to block the inner holes of the drill string 3 and the non-magnetic drill collar 4, ensuring that the magnetic guidance docking instrument 7 can be smoothly lowered into the seating assembly 10, and the one-way flow assembly 11 plays a pressure relief role during the drilling process.

[0053] Then, the cable 8 on the winch 9 transports the magnetic guidance docking instrument 7 along the inner hole of the drill pipe column 3 and the non-magnetic drill collar 4 to the seating assembly 10 of the navigation and transportation device 5. After the magnetic guidance docking instrument 7 is lowered, it is placed in the seating sleeve 13 in the seating assembly 10. The seating sleeve 13 is mainly used to fix the magnetic guidance docking instrument 7 to prevent the magnetic guidance docking instrument 7 from being in a suspended state, thereby causing deviation and shaking, resulting in inaccurate measurement data of the magnetic guidance docking instrument 7.

[0054] Finally, when the high-temperature salt well is successfully docked using the magnetic guidance docking instrument 7, the cable 8 on the winch 9 lifts the magnetic guidance docking instrument 7 out of the seating assembly 10 of the navigation and transportation device 5 along the inner hole of the drill pipe column 3 and the non-magnetic drill collar 4, and the drilling rig 2 takes the drill pipe column 3, the non-magnetic drill collar 4 and the navigation and transportation device 5 out of the directional well 1.

[0055] An application method of the high-temperature salt well directional well 1 docking navigation and transportation system as described above comprises the following steps:

[0056] Step 1: Connect the upper end of the drill pipe column 3 to the drilling rig 2, and connect the non-magnetic drill collar 4 at the lower end of the drill pipe column 3 to the navigation conveying device 5.

[0057] Among them, step 1, connecting the upper end of the drill pipe column 3 to the drilling rig 2, and connecting the non-magnetic drill collar 4 at the lower end of the drill pipe column 3 to the navigation and transportation device 5, further includes connecting the upper end of the drill pipe column 3 to the drilling rig 2, and threading the non-magnetic drill collar 4 at the lower end of the drill pipe column 3 to the female buckle 19 on the hanging assembly 10 of the navigation and transportation device 5.

[0058] Step 2, start the drilling rig 2, lower the drill pipe column 3, the non-magnetic drill collar 4 and the navigation and transportation device 5 into the directional well 1. If the navigation and transportation device 5 encounters resistance during the lowering process, execute step 21. If the navigation and transportation device 5 is lowered smoothly, execute step 3.

[0059] Among them, step 21, the drilling rig 2 pumps into saturated brine, and the saturated brine enters the cavity of the seating assembly 10 of the navigation and conveying device 5 along the inner holes of the drill pipe column 3 and the non-magnetic drill collar 4. The pressure of the saturated brine in the cavity of the seating assembly 10 causes the spring of the spring back pressure sleeve 16 in the one-way flow assembly 11 to contract, and the cavity of the one-way flow assembly 11 is opened. The saturated brine in the cavity of the seating assembly 10 enters the cavity of the one-way flow assembly 11, and the saturated brine in the cavity of the one-way flow assembly 11 enters the cavity of the guide assembly 12 through the through hole 15 on the partition 14, and is ejected through the lower injection hole 17 of the guide assembly 12. The saturated brine ejected from the injection hole 17 generates hydraulic impact to break up the obstructed rock cuttings and fallen blocks, and discharge them out of the directional well 1. If the navigation and conveying device 5 still encounters obstruction during the lowering process, step 22 is executed. If the navigation and conveying device 5 is smoothly lowered, step 3 is executed.

[0060] Among them, in step 22, the drilling rig 2 rotates the drill pipe column 3 and the non-magnetic drill collar 4 at a low speed, driving the navigation and transportation device 5 to rotate to remove the blocked rock cuttings and loose pieces. The drilling rig 2 then gradually increases the rotation speed of the drill pipe column 3 and the non-magnetic drill collar 4, driving the hard wear-resistant alloy block 18 on the surface of the guide assembly 12 of the navigation and transportation device 5 to rotate at a high speed to crush the rock cuttings and loose pieces, and discharge them out of the directional well 1, and continue to execute step 3.

[0061] Step 3, adjust the length of the drill string 3 and the non-magnetic drill collar 4 so that the navigation and transportation device 5 is located at the center of the high-temperature salt well cavity 6; the drilling rig 2 pumps saturated brine, and the saturated brine enters the cavity of the hanging assembly 10 of the navigation and transportation device 5 along the inner holes of the drill string 3 and the non-magnetic drill collar 4, and the pressure of the saturated brine in the cavity of the hanging assembly 10 causes the spring of the spring back pressure sleeve 16 in the one-way flow assembly 11 to contract, opening the cavity of the one-way flow assembly 11, and the saturated brine in the cavity of the hanging assembly 10 enters the one-way flow assembly 11. The saturated brine in the cavity of the flow assembly 11, the unidirectional flow assembly 11 enters the cavity of the guide assembly 12 through the through hole 15 on the partition 14, and is ejected through the lower injection hole 17 of the guide assembly 12, and the impurities inside the drill string 3, the non-magnetic drill collar 4 and the navigation and conveying device 5 are discharged; the drilling rig 2 is turned off to stop pumping in the saturated brine, and the pressure of the saturated brine in the cavity of the hanging assembly 10 disappears, causing the spring of the spring back pressure sleeve 16 in the unidirectional flow assembly 11 to stretch, and the cavity of the unidirectional flow assembly 11 is closed.

[0062] Among them, step 3, adjusting the length of the drill pipe column 3 and the non-magnetic drill collar 4 so that the navigation and transportation device 5 is located at the center of the high-temperature salt well cavity 6, further includes: after adjusting the length of the drill pipe column 3 and the non-magnetic drill collar 4 so that the navigation and transportation device 5 is located at the center of the high-temperature salt well cavity 6, if the salt layer of the high-temperature salt well collapses, the drilling rig 2 pumps saturated brine, and the saturated brine enters the cavity of the sitting and hanging assembly 10 of the navigation and transportation device 5 along the inner hole of the drill pipe column 3 and the non-magnetic drill collar 4, and the cavity of the sitting and hanging assembly 10 The pressure of the saturated brine in the body causes the spring of the spring return sleeve 16 in the one-way flow assembly 11 to contract, opening the cavity of the one-way flow assembly 11, and the saturated brine in the cavity of the hanging assembly 10 enters the cavity of the one-way flow assembly 11, and the saturated brine in the cavity of the one-way flow assembly 11 enters the cavity of the guide assembly 12 through the through hole 15 on the partition 14, and is ejected through the injection hole 17 at the bottom of the guide assembly 12. The ejected saturated brine dilutes and dissolves the collapsed part of the salt layer, and is discharged from the wellhead of the high-temperature salt well.

[0063] Step 4, start the winch 9, the cable 8 on the winch 9 transports the magnetic guidance docking instrument 7 along the inner hole of the drill pipe column 3 and the non-magnetic drill collar 4 to the seating assembly 10 of the navigation and transportation device 5, and then close the winch 9.

[0064] Step 5, the magnetic guidance docking instrument 7 guides the drill bit 23 in the horizontal well 21 to drill according to the magnetic line signal emitted by the strong magnetic joint 22 in the horizontal well 21, until the horizontal well 21 and the directional well 1 are successfully docked and connected.

[0065] Step 6, start the winch 9, the cable 8 on the winch 9 lifts the magnetically guided docking instrument 7 out of the sitting and hanging assembly 10 of the navigation and conveying device 5 along the inner hole of the drill pipe column 3 and the non-magnetic drill collar 4, and then close the winch 9.

[0066] Step 7: Start the drilling rig 2, take out the drill string 3, the non-magnetic drill collar 4 and the navigation and transportation device 5 from the directional well 1, and shut down the drilling rig 2.

[0067] Example 2

[0068] The specific construction method of the high-temperature salt well directional well 1 docking navigation and transportation system is as follows:

[0069] Step 1: Connect the upper end of the drill string 3 to the drilling rig 2, and connect the non-magnetic drill collar 4 at the lower end of the drill string 3 to the navigation and transportation device 5, that is, assemble the drilling rig 2, the drill string 3, the non-magnetic drill collar 4 and the navigation and transportation device 5 together.

[0070] Step 2, start the drilling rig 2, lower the drill pipe column 3, the non-magnetic drill collar 4 and the navigation and transportation device 5 into the directional well 1. When the navigation and transportation device 5 enters the open hole, start to control the lowering speed, especially in the well section with salt layer. If the navigation and transportation device 5 encounters resistance during the lowering process, execute step 21. If the navigation and transportation device 5 is smoothly lowered, execute step 3.

[0071] Among them, step 21, the drilling rig 2 pumps into saturated brine, and the saturated brine enters the cavity of the seating assembly 10 of the navigation and conveying device 5 along the inner holes of the drill pipe column 3 and the non-magnetic drill collar 4. The pressure of the saturated brine in the cavity of the seating assembly 10 causes the spring of the spring back pressure sleeve 16 in the one-way flow assembly 11 to contract, and the cavity of the one-way flow assembly 11 is opened. The saturated brine in the cavity of the seating assembly 10 enters the cavity of the one-way flow assembly 11, and the saturated brine in the cavity of the one-way flow assembly 11 enters the cavity of the guide assembly 12 through the through hole 15 on the partition 14, and is ejected through the lower injection hole 17 of the guide assembly 12. The saturated brine ejected from the injection hole 17 generates hydraulic impact to break up the obstructed rock cuttings and fallen blocks, and discharge them out of the directional well 1. If the navigation and conveying device 5 still encounters obstruction during the lowering process, step 22 is executed. If the navigation and conveying device 5 is smoothly lowered, step 3 is executed.

[0072] Among them, in step 22, the drilling rig 2 rotates the drill pipe column 3 and the non-magnetic drill collar 4 at a low speed, driving the navigation and transportation device 5 to rotate to remove the blocked rock cuttings and loose pieces. The drilling rig 2 then gradually increases the rotation speed of the drill pipe column 3 and the non-magnetic drill collar 4, driving the hard wear-resistant alloy block 18 on the surface of the guide assembly 12 of the navigation and transportation device 5 to rotate at a high speed to crush the rock cuttings and loose pieces, and discharge them out of the directional well 1, and continue to execute step 3.

[0073] Step 3, adjust the length of the drill pipe column 3 and the non-magnetic drill collar 4 so that the navigation and transportation device 5 is located at the center of the high-temperature salt well cavity 6. By calculating the length of the drill pipe column 3, the non-magnetic drill collar 4 and the navigation and transportation device 5, the navigation and transportation device 5 is accurately lowered to a position 1-2m below the top plate of the target salt layer. Under the rigid action of the drill pipe column 3 and the non-magnetic drill collar 4, the navigation and transportation device 5 is ensured to be located at the center of the high-temperature salt well cavity 6; the drilling rig 2 pumps saturated brine, and the saturated brine enters the cavity of the hanging assembly 10 of the navigation and transportation device 5 along the inner hole of the drill pipe column 3 and the non-magnetic drill collar 4. The pressure of the saturated brine in the cavity of the hanging assembly 10 causes the spring of the spring back pressure sleeve 16 in the one-way flow assembly 11 to contract, opening the cavity of the one-way flow assembly 11, and the saturated brine in the cavity of the hanging assembly 10 enters the one-way flow assembly 11. The saturated brine in the cavity of the one-way flow assembly 11 enters the cavity of the guide assembly 12 through the through hole 15 on the partition 14, and is ejected through the lower injection hole 17 of the guide assembly 12 to discharge the impurities inside the drill pipe column 3, the non-magnetic drill collar 4 and the navigation and transportation device 5, ensuring that the inner holes of the drill pipe column 3 and the non-magnetic drill collar 4 form a smooth channel, which is convenient for the transportation of the magnetic guidance docking instrument 7; the drilling rig 2 is closed to stop pumping in the saturated brine, and the pressure of the saturated brine in the cavity of the hanging assembly 10 disappears, causing the spring of the spring back pressure sleeve 16 in the one-way flow assembly 11 to stretch, closing the cavity of the one-way flow assembly 11 to prevent the debris in the well from returning to the inner holes of the drill pipe column 3 and the non-magnetic drill collar 4.

[0074] Among them, step 3, adjusting the length of the drill pipe column 3 and the non-magnetic drill collar 4 so that the navigation and transportation device 5 is located at the center of the high-temperature salt well cavity 6, further includes: after adjusting the length of the drill pipe column 3 and the non-magnetic drill collar 4 so that the navigation and transportation device 5 is located at the center of the high-temperature salt well cavity 6, if the salt layer of the high-temperature salt well collapses, the drilling rig 2 pumps saturated brine, and the saturated brine enters the cavity of the sitting and hanging assembly 10 of the navigation and transportation device 5 along the inner hole of the drill pipe column 3 and the non-magnetic drill collar 4, and the cavity of the sitting and hanging assembly 10 The pressure of the saturated brine in the body causes the spring of the spring return sleeve 16 in the one-way flow assembly 11 to contract, opening the cavity of the one-way flow assembly 11, and the saturated brine in the cavity of the hanging assembly 10 enters the cavity of the one-way flow assembly 11, and the saturated brine in the cavity of the one-way flow assembly 11 enters the cavity of the guide assembly 12 through the through hole 15 on the partition 14, and is ejected through the injection hole 17 at the bottom of the guide assembly 12. The ejected saturated brine dilutes and dissolves the collapsed part of the salt layer, and is discharged from the wellhead of the high-temperature salt well.

[0075] Step 4, start the magnetic guidance docking instrument 7, and test whether the magnetic guidance docking instrument 7 operates normally. Start the winch 9, and the cable 8 on the winch 9 transports the magnetic guidance docking instrument 7 along the inner hole of the drill pipe column 3 and the non-magnetic drill collar 4 to the sitting and hanging assembly 10 of the navigation and transportation device 5, and sits and hangs for 3 times in succession. The sitting and hanging situation is judged by the signal of the magnetic guidance docking instrument 7, and it is ensured that the magnetic guidance docking instrument 7 enters the sitting and hanging assembly 10 of the navigation and transportation device 5 to ensure that the magnetic guidance docking instrument 7 does not deviate or shake. Turn off the winch 9.

[0076] Step 5, the magnetic guidance docking instrument 7 guides the drill bit 23 in the horizontal well 21 to drill according to the magnetic line signal sent by the strong magnetic joint 22 in the horizontal well 21, until the horizontal well 21 is successfully docked and connected with the directional well 1. During the docking and connection process, the magnetic guidance docking instrument 7 sits in the sitting and hanging assembly 10. Since the weight of the non-magnetic drill collar 4 and the drill string 3 is as high as tens of tons, the magnetic guidance docking instrument 7 is minimally affected by external vibration, and the docking signal is received more accurately and reliably, and the precise parameters of the high-temperature salt well cavity 6 are mastered to achieve the purpose of precise docking.

[0077] Step 6, start the winch 9, the cable 8 on the winch 9 pulls the magnetic guidance docking instrument 7 out of the sitting assembly 10 of the navigation and transportation device 5 along the inner holes of the drill pipe column 3 and the non-magnetic drill collar 4, and close the winch 9. The magnetic guidance docking instrument 7 is transported to the navigation and transportation device 5 through the inner holes of the non-magnetic drill collar 4 and the drill pipe column 3. Since the inner holes of the non-magnetic drill collar 4 and the drill pipe column 3 are the same in size, the magnetic guidance docking instrument 7 will not get stuck during the lowering and removal process; if the cable 8 breaks, the magnetic guidance docking instrument 7 will fall into the navigation and transportation device 5, and will not fall into the directional well 1, causing an accident. The magnetic guidance docking instrument 7 can be taken out by pulling out the navigation and transportation device 5.

[0078] Step 7: Start the drilling rig 2, take out the drill string 3, the non-magnetic drill collar 4 and the navigation and transportation device 5 from the directional well 1, and shut down the drilling rig 2.

[0079] The present invention achieves the purpose of inserting and pulling out the magnetic guidance docking instrument 7 into the irregular dissolution cavity of a deep, high-temperature, directional salt well by using the navigation conveying device 5, and docking accurately.

[0080] 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. A high-temperature salt well directional well docking navigation and transportation system, characterized in that: It includes a directional well, a drilling rig, a drill pipe column, a non-magnetic drill collar, a navigation and transportation device, a high-temperature salt well cavity, a magnetic guidance docking instrument, a cable and a winch. The drilling rig is installed at the wellhead of the directional well, a drill pipe column is arranged inside the directional well, the upper end of the drill pipe column is connected to the drilling rig, the non-magnetic drill collar at the lower end of the drill pipe column is connected to the navigation and transportation device, the navigation and transportation device is placed at the center of the high-temperature salt well cavity, the magnetic guidance docking instrument in the navigation and transportation device is connected to the lower end of the cable, and the upper end of the cable passes through the non-magnetic drill collar and the drill pipe column in sequence and is connected to the winch; The navigation and conveying device is provided with a sitting and hanging assembly, a one-way flow assembly and a deflection guide assembly in sequence from top to bottom. The upper part of the sitting and hanging assembly is connected to the non-magnetic drill collar at the lower end of the drill pipe column. A sitting and hanging sleeve is installed inside the sitting and hanging assembly. A magnetic guide docking instrument is placed in the sitting and hanging sleeve. The cavity of the sitting and hanging assembly is communicated with the cavity of the one-way flow assembly. A partition is provided between the cavity of the one-way flow assembly and the cavity of the deflection guide assembly. A through hole is opened on the partition. A spring return pressure sleeve is installed in the middle of the partition and the spring return pressure sleeve is located in the cavity of the one-way flow assembly. An injection hole is opened at the lower part of the deflection guide assembly. The lower end of the deflection guide assembly is in a cone shape, and the outer surface of the deflection guide assembly is evenly inlaid with hard and wear-resistant alloy blocks. Among them, through holes are symmetrically opened on the partitions on the left and right sides of the spring return pressure sleeve.

2. The high-temperature salt well directional well docking navigation and transportation system according to claim 1 is characterized by: A threaded female buckle is arranged on the upper part of the seating assembly, and the upper part of the seating assembly is threadedly connected to the non-magnetic drill collar at the lower end of the drill pipe column through the female buckle, and a seating sleeve is installed inside the seating assembly through a top screw.

3. The high-temperature salt well directional well docking navigation and transportation system according to claim 1 is characterized by: The deflection guide assembly is provided with three injection hole groups at equal intervals from bottom to top, and each of the injection hole groups includes four evenly distributed injection holes.

4. An application method of the high-temperature salt well directional well docking navigation and transportation system according to claim 1, characterized in that: The following steps are involved: Step 1, connect the upper end of the drill string to the drilling rig, and connect the non-magnetic drill collar at the lower end of the drill string to the navigation conveying device; Step 2, start the drilling rig, lower the drill string, the non-magnetic drill collar and the navigation conveying device into the directional well. If the navigation conveying device encounters an obstacle during the lowering process, execute step 21; if the navigation conveying device is lowered smoothly, execute step 3; Step 21, the drilling rig pumps in saturated salt water, which enters the cavity of the seating assembly of the navigation and conveying device along the inner holes of the drill pipe column and the non-magnetic drill collar, and the pressure of the saturated salt water in the cavity of the seating assembly contracts the spring of the spring back pressure sleeve in the one-way flow assembly to open the cavity of the one-way flow assembly, and the saturated salt water in the cavity of the seating assembly enters the cavity of the one-way flow assembly, and the saturated salt water in the cavity of the one-way flow assembly enters the cavity of the guide and deflection assembly through the through hole on the partition, and is ejected through the lower injection hole of the guide and deflection assembly, and the saturated salt water ejected from the injection hole generates hydraulic impact to break the rock cuttings and blocks that encounter obstacles, and discharge them out of the directional well. If the navigation and conveying device still encounters obstacles during the lowering process, execute step 22, and if the navigation and conveying device is smoothly lowered, execute step 3; Step 22, the drilling rig rotates the drill pipe column and the non-magnetic drill collar at a low speed, driving the navigation conveying device to rotate and remove the rock cuttings and blocks that are blocked, and then the drilling rig gradually increases the rotation speed of the drill pipe column and the non-magnetic drill collar, driving the hard wear-resistant alloy block on the surface of the guide and deflection assembly of the navigation conveying device to rotate at a high speed to crush the rock cuttings and blocks, and discharge them out of the directional well, and continue to execute step 3; Step 3, adjust the length of the drill string and the non-magnetic drill collar so that the navigation and transportation device is located at the center of the high-temperature salt well cavity; the drilling rig pumps in saturated brine, and the saturated brine enters the cavity of the seating assembly of the navigation and transportation device along the inner holes of the drill string and the non-magnetic drill collar, the pressure of the saturated brine in the cavity of the seating assembly causes the spring of the spring back pressure sleeve in the one-way flow assembly to contract, and the cavity of the one-way flow assembly is opened, the saturated brine in the cavity of the seating assembly enters the cavity of the one-way flow assembly, the saturated brine in the cavity of the one-way flow assembly enters the cavity of the guide assembly through the through hole on the partition, and is ejected through the lower injection hole of the guide assembly, and impurities in the drill string, the non-magnetic drill collar and the navigation and transportation device are discharged; the drilling rig is shut down to stop pumping in saturated brine, the pressure of the saturated brine in the cavity of the seating assembly disappears, causing the spring of the spring back pressure sleeve in the one-way flow assembly to stretch, and the cavity of the one-way flow assembly is closed; Step 4, start the winch, the cable on the winch transports the magnetic guidance docking instrument along the inner hole of the drill pipe column and the non-magnetic drill collar to the sitting and hanging assembly of the navigation and transportation device, and close the winch; Step 5: The magnetic guidance docking instrument guides the drill bit in the horizontal well to drill according to the magnetic line signal sent by the strong magnetic joint in the horizontal well, until the horizontal well and the directional well are successfully docked and connected; Step 6, start the winch, the cable on the winch pulls the magnetically guided docking instrument out from the sitting and hanging assembly of the navigation conveying device along the inner hole of the drill pipe column and the non-magnetic drill collar, and close the winch; Step 7: Start the drilling rig, remove the drill string, non-magnetic drill collar and navigation conveying device from the directional well, and shut down the drilling rig.

5. The application method of the high-temperature salt well directional well docking navigation and transportation system according to claim 4 is characterized by: Step 1, connect the upper end of the drill pipe column to the drilling rig, and connect the non-magnetic drill collar at the lower end of the drill pipe column to the navigation and transportation device, further including connecting the upper end of the drill pipe column to the drilling rig, and threading the non-magnetic drill collar at the lower end of the drill pipe column to the female buckle on the hanging assembly of the navigation and transportation device.

6. The application method of the high-temperature salt well directional well docking navigation and transportation system according to claim 4 is characterized by: Step 3, adjusting the length of the drill string and the non-magnetic drill collar so that the navigation and transportation device is located at the center of the high-temperature salt well cavity, further including: after adjusting the length of the drill string and the non-magnetic drill collar so that the navigation and transportation device is located at the center of the high-temperature salt well cavity, if the salt layer of the high-temperature salt well collapses, the drilling rig pumps saturated brine, and the saturated brine enters the cavity of the seating assembly of the navigation and transportation device along the inner holes of the drill string and the non-magnetic drill collar, the pressure of the saturated brine in the cavity of the seating assembly causes the spring of the spring back pressure sleeve in the one-way flow assembly to contract, opening the cavity of the one-way flow assembly, the saturated brine in the cavity of the seating assembly enters the cavity of the one-way flow assembly, the saturated brine in the cavity of the one-way flow assembly enters the cavity of the guide assembly through the through hole on the partition, and is ejected through the lower injection hole of the guide assembly, the ejected saturated brine dilutes the collapsed part of the dissolved salt layer, and is discharged from the wellhead of the high-temperature salt well.

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