Tube descending device and method for in-situ leaching liquid extraction hole

Abstract

The invention belongs to the technical field of exploration construction, and relates to a pipe lowering device and method for an in-situ leaching liquid extraction hole, the pipe lowering device comprises a sleeving piece, a first drawing piece and a second drawing piece, a lantern ring formed by the sleeving piece, the first drawing piece and the second drawing piece is arranged on a well pipe in a sleeving mode, and the lantern ring is arranged at the lower end of the first well pipe in a sleeving mode; the advancing direction of the well casing is adjusted by pulling the first drawing piece and the second drawing piece, the well casing moves downwards under the action of self weight when the first drawing piece and the second drawing piece are lowered, and then lowering of the well casing is completed, and a subsequent well casing is inserted into the expanded end of the previous well casing to be bonded and fixed. And the first drawing piece and the second drawing piece are continuously put down until all the well casings are put down, and then the first drawing piece and the second drawing piece are taken out, so that the working efficiency is improved. In the process of lowering the well pipe, the direction of the well pipe at the lowermost end can be adjusted by pulling the first drawing piece and the second drawing piece left and right, the situation that a casing pipe is clamped by the well wall in the pipe lowering process is avoided, and the pipe lowering efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of exploration construction, and in particular relates to a pipe lowering device and method for an in-situ leaching liquid extraction hole. Background Art

[0002] In-situ leaching is a mining technology that injects leaching solution into the ore layer through the injection hole under the natural production conditions of the ore. The leaching solution selectively leaches the useful components in the ore, and the generated soluble compounds enter the leaching solution flow and are lifted to the surface through the extraction hole for processing and extraction of metals. The stratum lithology is mainly sandstone, followed by conglomerate, sandstone and mudstone.

[0003] The pumping hole, also known as the extraction well, is a drilled hole in the in-situ leaching system used to lift the leaching liquid from the producing ore layer to the surface. A polyvinyl chloride plastic casing needs to be installed in the pumping hole. The casing is made up of multiple well pipes connected end to end. Each well pipe has an enlarged end, and two adjacent well pipes are connected and fixed by plugging in the enlarged end.

[0004] In some remote and complex terrain areas, there is a lack of mechanical assistance for pipe lowering, which makes pipe lowering difficult. In addition, due to the irregularity of the wellbore and the complexity of the formation, when the wellbore expansion rate is large or when the inclination of the pumping hole is large, the centering of the casing cannot be guaranteed sometimes. The casing may be stuck by the well wall, resulting in the inability to smoothly lower the casing into the pumping hole, reducing the pipe lowering efficiency and low hole formation rate. Summary of the invention

[0005] In view of this, the present invention provides a pipe lowering device and method for an in-situ leaching pumping hole, which can improve the centering degree of the casing, avoid the casing being stuck by the well wall during the pipe lowering process, improve the pipe lowering efficiency, and improve the hole formation rate.

[0006] The technical solution of the present invention is:

[0007] The down pipe device of the ground leaching pumping hole comprises:

[0008] A sleeve connector, wherein the sleeve connector is arranged in an arc shape, and rings are arranged at both ends of the sleeve connector;

[0009] A first drawer and a second drawer, both of which are flexible linear structures, a first knot is provided at a first end of the first drawer, a second knot is provided at a first end of the second drawer, the second knot passes through the first knot, a rod is passed through the second knot, one end of the rod is fixedly connected to a third drawer, the third drawer is a flexible linear structure, and the second ends of the first drawer and the second ends of the second drawer pass through corresponding rings respectively;

[0010] The sleeve connector, the first drawer and the second drawer form a collar, which is used to be sleeved on the lower end of the well pipe and apply a force to the second end of the first drawer and the second end of the second drawer to adjust the direction of the well pipe.

[0011] Furthermore, the sleeve connector is made of a flexible material, and the radius of the arc matches the outer diameter of the well pipe.

[0012] Furthermore, the angle of the sleeve is 150°-180°, and the rings at both ends of the sleeve are symmetrically arranged.

[0013] Furthermore, the socket connector includes one of an iron wire or a plastic-steel wire.

[0014] Furthermore, gaskets are fixedly connected to both ends of the sleeve, and through holes are formed on the gaskets.

[0015] Furthermore, both ends of the sleeve connector are connected with one of nylon cable ties, nylon rope buckles or rubber rope buckles.

[0016] The present invention also provides a method for lowering a pipe of an in-situ leaching pumping hole, comprising the following steps:

[0017] The sleeve connecting piece, the first pull-out piece and the second pull-out piece form a sleeve ring, which is sleeved on the side of the well pipe close to the enlarged end;

[0018] Pulling the first pull-out member and the second pull-out member left and right and lowering them is used to adjust the direction of the well pipe to lower the well pipe;

[0019] Connect the next well pipe, and then lower the first pull-out piece and the second pull-out piece, and repeat the cycle;

[0020] After all the well pipes are lowered into place, the first drawer and the second drawer are disassembled, and the first drawer and the second drawer are pulled out to complete the pipe lowering.

[0021] Furthermore, the method of forming a ring with the sleeve, the first drawer and the second drawer comprises the following steps:

[0022] Put the socket on the well pipe;

[0023] Pass the first drawer and the second drawer through the through holes at both ends of the sleeve respectively;

[0024] Pass the second knot through the first knot, and insert the rod into the second knot;

[0025] The extending ends of the first drawer and the second drawer are respectively tightened to make the sleeve member, the first drawer and the second drawer be sleeved on the well pipe.

[0026] Furthermore, the method for disassembling the first drawer and the second drawer includes pulling the third drawer upward to pull the rod out of the second knot.

[0027] Compared with the prior art, the pipe lowering device and method for ground leaching liquid extraction holes provided by the present invention have the following beneficial effects:

[0028] The present invention forms a sleeve ring through a sleeve connector, a first pull-out member and a second pull-out member, and is sleeved on a well pipe. In the process of lowering the well pipe into the pumping hole, the sleeve ring is sleeved on the lower end of the first well pipe, and the first pull-out member and the second pull-out member are pulled to adjust the direction of travel of the well pipe. When the first pull-out member and the second pull-out member are lowered, the well pipe moves downward under the action of deadweight to complete the lowering of the well pipe. After the first well pipe is lowered to a certain height, the subsequent well pipe is inserted into the enlarged end of the previous well pipe and bonded and fixed, and the first pull-out member and the second pull-out member are continuously lowered until all the well pipes are lowered and then the first pull-out member and the second pull-out member are taken out, thereby improving work efficiency. In the process of lowering the well pipe, the present invention can adjust the direction of the bottom well pipe by pulling the first pull-out member and the second pull-out member left and right, thereby adjusting the centering degree of the casing, avoiding the casing being stuck by the well wall during the lowering process, and improving the lowering efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The overall structure diagram of the device of the present invention is

[0030] Description of reference numerals:

[0031] 1. the third drawer, 2. the sleeve, 3. the first drawer, 4. the first gasket, 5. the well pipe, 6. the second drawer, 7. the second gasket, 8. the rod. DETAILED DESCRIPTION

[0032] It should be noted that, in the description of the present invention, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0034] In addition, it should be noted that the connections involved in the present invention can be achieved by using conventional connection methods and do not involve any innovation.

[0035] The subject of the present invention is a down-pipe device and method for in-situ leaching pumping holes. In-situ leaching is a mining technology in which leachate is injected into the ore layer through the injection hole under the natural production conditions of the ore. The leachate selectively leaches the useful components in the ore, and the generated soluble compounds enter the leachate flow and are lifted to the surface through the pumping hole for processing and metal extraction. The in-situ leaching work area is sparsely populated, the industrial foundation is weak, the transportation conditions are poor, the south is high and the north is low, the altitude is generally 1300-1400m, and the lowest temperature is -41℃. The stratum lithology is mainly sandstone, followed by conglomerate, sandstone and mudstone.

[0036] The pumping hole, also known as the extraction well, is a drilled hole in the in-situ leaching system used to lift the leaching liquid from the producing ore layer to the surface. A polyvinyl chloride plastic casing needs to be installed in the pumping hole. The casing is made up of multiple well pipes connected end to end. Each well pipe has an enlarged end, and two adjacent well pipes are connected and fixed by plugging in the enlarged end.

[0037] In the prior art, when lowering the casing into the pumping hole, a casing centralizer is installed at the lower end of the casing to center the casing string in the wellbore. In some remote geographical areas with complex terrain, there is a lack of mechanical assistance for lowering the casing, which makes it difficult to lower the casing. In addition, due to the irregularity of the wellbore and the complexity of the formation, when the wellbore expansion rate is large or when the inclination of the pumping hole is large, the use of the casing centralizer sometimes cannot ensure the centering of the casing, and the casing may be stuck by the well wall, resulting in the casing being unable to be smoothly lowered into the pumping hole, reducing the efficiency of lowering the casing.

[0038] Based on the above reasons, the present invention provides a pipe lowering device and method for ground leaching liquid extraction holes to solve the above-mentioned technical problems. Figure 1 , the present invention is described in detail.

[0039] Example 1

[0040] The down pipe device of the ground leaching liquid extraction hole provided by the present invention is as follows: Figure 1 As shown, the device specifically includes a sleeve member 2, a first drawer member 3 and a second drawer member 6.

[0041] Among them, the sleeve 2 is set in an arc shape, and both ends of the sleeve 2 are provided with rings; the first pull-out member 3 and the second pull-out member 6, the first pull-out member 3 and the second pull-out member 6 are both flexible linear structures, a first knot is set at the first end of the first pull-out member 3, and a second knot is set at the first end of the second pull-out member 6, the second knot passes through the first knot, and a rod 8 is passed through the second knot, and one end of the rod 8 is fixedly connected to the third pull-out member 1, the third pull-out member 1 extends upward from the well pipe, and the third pull-out member 1 is a flexible linear structure, and the second end of the first pull-out member 3 and the second end of the second pull-out member 6 pass through the corresponding rings respectively. In this embodiment, the first pull-out member 3 and the second pull-out member 6 can both be selected as ropes.

[0042] When in use, the sleeve 2, the first pull-out member 3 and the second pull-out member 6 form a ring, which is used to be sleeved on the lower end of the well pipe. The second ends of the first pull-out member 3 and the second pull-out member 6 extend upward to the well pipe, and pulling the second ends of the first pull-out member 3 and the second pull-out member 6 is used to adjust the direction of the well pipe.

[0043] When in use, the staff manually tightens the second ends of the first drawer 3 and the second drawer 6 to fix the ring on the well pipe 5. After that, the second ends of the first drawer 3 and the second drawer 6 are lowered, and the well pipe 5 moves downward under the action of its own weight, and the first drawer 3 and the second drawer 6 always remain in a taut state. When it is necessary to adjust the forward direction of the well pipe 5 to tilt to one side, the rope on the other side is loosened to adjust the forward direction of the well pipe 5 to prevent the well pipe 5 from being stuck by the well wall.

[0044] The well pipe 5 is generally a PVC pipe. In this embodiment, the first pull-out member 3 and the second pull-out member 6 can be made of nylon rope, and the rod 8 can be made of iron nails.

[0045] In this embodiment, in order to make the sleeve 2 and the well pipe 5 fit closely and increase the friction between the sleeve 2 and the well pipe 5, the sleeve 2 is made of a flexible material, and the radius of the sleeve 2 matches the outer diameter of the well pipe. The angle of the sleeve 2 is 150°-180°. The rings at both ends of the sleeve 2 are symmetrically arranged, and the connecting line between the center lines of the two through holes is along the diameter direction of the well pipe 5, which can further ensure the accuracy of the direction adjustment of the well pipe 5 and avoid the well pipe 5 from being skewed and causing a trip.

[0046] In this embodiment, the socket 2 includes one of an iron wire or a plastic steel wire. Gaskets are fixedly connected at both ends of the socket 2, and through holes are opened on the gaskets, which are respectively the first gasket 4 and the second gasket 7 in the figure. Alternatively, both ends of the socket 2 are connected with one of a nylon cable tie, a nylon rope buckle or a rubber rope buckle.

[0047] The sleeve 2 and the materials forming the through holes at both ends thereof are made of non-polluting flexible materials. After the lower pipe is completed, the sleeve 2 and the materials forming the through holes at both ends thereof are not taken out.

[0048] Working principle of this embodiment

[0049] When the down tube device of this embodiment is in use, the second knot is passed through the first knot, and the rod 8 is passed through the second knot, thereby forming a detachable connection between the first pull-out member 3 and the second pull-out member 6, and the third pull-out member 1 connected to the upper end of the rod 8 is a disassembly switch.

[0050] The ring formed by the sleeve 2, the first pull-out piece 3 and the second pull-out piece 6 is put on the well pipe 5. When in use, the ring moves down with the well pipe 5 into the liquid extraction hole. The extended ends of the first pull-out piece 3, the second pull-out piece 6 and the third pull-out piece 1 are all located outside the liquid extraction hole. The staff holds the first pull-out piece 3 and the second pull-out piece 6 at the orifice of the liquid extraction hole. The third pull-out piece 1 only needs to ensure that its end is located outside the orifice. The third pull-out piece 1 is not used during the pipe lowering process.

[0051] During normal pipe lowering, the first pull-out member 3 and the second pull-out member 6 are loosened at the same time. When the direction of the lowered casing needs to be adjusted, the first pull-out member 3 and the second pull-out member 6 are pulled left and right to adjust the direction of the bottommost well pipe, thereby preventing the well pipe from being stuck by the well wall during the pipe lowering process. The method is simple and easy to operate, saves manpower, time, and labor, has a high well completion rate, and saves costs.

[0052] Example 2

[0053] This embodiment provides a method for lowering a pipe in an in-situ leaching pumping hole. The method is applicable to a pumping well within 100 m. The above-mentioned device is used during implementation. The method includes the following steps:

[0054] Preparation work before pipe lowering: ① Punch holes and change slurry before pipe lowering. ② Put a certain number of loess balls and cement bags to stop water at the bottom of the hole. ③ According to the thickness of the ore body, the burial depth data and the hole depth data, arrange the well wall pipe and the water filter pipe in the order of insertion and make preparations for pipe lowering.

[0055] Tube lowering method:

[0056] First, the sleeve connecting member 2, the first pull-out member 3 and the second pull-out member 6 are assembled into a sleeve ring, and the sleeve ring is tightly sleeved on the side of the well pipe close to the enlarged end;

[0057] Pull the first drawer 3 and the second drawer 6 left and right to adjust the direction of the well pipe to lower the well pipe;

[0058] The second well pipe is inserted into the enlarged end of the first well pipe, and is bonded with PVC adhesive and anchored with anchor nails, and then the first pull-out member 3 and the second pull-out member 6 are lowered, and the cycle is repeated to lower the well pipes one by one;

[0059] After all the well pipes are lowered into place, the first drawer 3 and the second drawer 6 are disassembled, and the first drawer 3 and the second drawer 6 are pulled out from the hole to complete the pipe lowering.

[0060] In this embodiment, the method of specifically forming a ring with the socket 2, the first pull-out member 3 and the second pull-out member 6 includes the following steps: putting the socket 2 on the well pipe; passing the first pull-out member 3 and the second pull-out member 6 through the through holes at both ends of the socket 2 respectively; passing the second knot through the first knot, and inserting the rod 8 into the second knot; tightening the extending ends of the first pull-out member 3 and the second pull-out member 6 at the hole mouth respectively, so that the socket 2, the first pull-out member 3 and the second pull-out member 6 are put on the well pipe.

[0061] In this embodiment, the specific method of disassembling the first drawer 3 and the second drawer 6 includes pulling the third drawer 1 upward at the opening of the liquid extraction hole to pull the rod 8 out of the second knot.

[0062] During the process of lowering the pipe, the collar is always sleeved on the lower end of the first well pipe, and there is no need to dismantle the collar when the length of the well pipes is increased one by one later.

[0063] Put the collar on the first diameter change of the well pipe, one person is responsible for the first pull-out piece 3, one person is responsible for the second pull-out piece 6, and at the same time ensure the lowering of the second pull-out piece 6, and the other two are responsible for the insertion, bonding and anchoring of the well pipe. The lower pipe mainly pulls the first pull-out piece 3 and the second pull-out piece 6, and when the well pipe reaches the bottom, pull the third pull-out piece 1 upward to release it.

[0064] In a certain mining pumping hole process test, a total of 6 wells were constructed. 4 wells were drilled using the method of the present invention, and all 4 wells were completed with a success rate of 100%; 2 wells were not drilled using the method of the present invention, and only 1 well was completed with a success rate of 50%, thereby improving economic benefits.

[0065] The above disclosure is only a preferred specific embodiment of the present invention, but the embodiments of the present invention are not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A down-pipe device for an in-situ leaching pumping hole, characterized in that: include: A sleeve connecting piece (2), the sleeve connecting piece (2) being arranged in an arc shape, and having rings arranged at both ends of the sleeve connecting piece (2); A first drawer (3) and a second drawer (6), both of which are flexible linear structures, a first end of the first drawer (3) is provided with a first knot, a first end of the second drawer (6) is provided with a second knot, the second knot passes through the first knot, a rod (8) passes through the second knot, one end of the rod (8) is fixedly connected to a third drawer (1), the third drawer (1) is a flexible linear structure, the second end of the first drawer (3) and the second end of the second drawer (6) pass through corresponding rings respectively; The sleeve member (2), the first drawer member (3) and the second drawer member (6) form a sleeve ring, which is used to be sleeved on the lower end of the well pipe (5) and to apply a force to the second end of the first drawer member (3) and the second end of the second drawer member (6) to adjust the direction of the well pipe (5).

2. The down-pipe device for the ground leaching pumping hole according to claim 1, characterized in that: The sleeve connector (2) is made of a flexible material, and the radius of the arc matches the outer diameter of the well pipe.

3. The down-pipe device for the ground leaching pumping hole according to claim 1, characterized in that: The angle of the arc is 150°-180°, and the rings at both ends of the sleeve (2) are symmetrically arranged.

4. The down-pipe device for the ground leaching pumping hole according to claim 1, characterized in that: The socket (2) comprises one of an iron wire or a plastic-steel wire.

5. The down-pipe device for the ground leaching pumping hole according to claim 1, characterized in that: Gaskets are fixedly connected to both ends of the sleeve (2), and through holes are provided on the gaskets.

6. The down-pipe device for the ground leaching pumping hole according to claim 1, characterized in that: Both ends of the sleeve connector (2) are connected with one of nylon cable ties, nylon cord buckles or rubber cord buckles.

7. A method for lowering a pipe in an in-situ leaching pumping hole, using the device of claim 1, characterized in that: The method comprises the following steps: The sleeve connecting piece (2), the first pull-out piece (3) and the second pull-out piece (6) form a sleeve ring, which is sleeved on the side of the first well pipe (5) close to the enlarged end; Pulling the first pull-out member (3) and the second pull-out member (6) left and right to adjust the direction of the first well pipe to lower the well pipe (5); Connect the next well pipe, and then lower the first drawer (3) and the second drawer (6), and repeat the cycle; After all the well pipes are lowered into place, the first drawer (3) and the second drawer (6) are disassembled, and the first drawer (3) and the second drawer (6) are pulled out to complete the pipe lowering.

8. The method for laying pipes in ground leaching holes according to claim 7, characterized in that: The method of forming a sleeve ring with the sleeve connecting member (2), the first drawer member (3) and the second drawer member (6) comprises the following steps: Putting the sleeve (2) onto the well pipe (5); Passing the first drawer (3) and the second drawer (6) through the through holes at both ends of the sleeve (2) respectively; Passing the second knot through the first knot, and inserting the rod (8) into the second knot; The extended ends of the first drawer (3) and the second drawer (6) are respectively tightened so that the sleeve connector (2), the first drawer (3) and the second drawer (6) are sleeved on the well pipe (5).

9. The method for laying pipes in ground leaching holes according to claim 8, characterized in that: The method for disassembling the first drawer (3) and the second drawer (6) comprises pulling the third drawer (1) upwards to pull the rod (8) out of the second knot.

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