Reinforcing device and construction method

Abstract

The application relates to a reinforcing device and a construction method. The reinforcing device comprises a first pipe body, a second pipe body and at least one expansion body. The cross section of the second pipe body perpendicular to the extending direction has a folded state and an expanded state. The pipe wall of the second pipe body has a flexible state and a solidified state. The expansion body has a first state and a second state. The volume of the expansion body in the second state is adjustable. When the cross section of the second pipe body is in the expanded state and the pipe wall is in the flexible state, the second pipe body is attached to the inner wall of a well hole. The expansion body is controllably changed from the first state to the second state. The first pipe body is controllably moved along the extending direction of the well hole, so that the expansion body is used for modifying the cross section shape of the well hole. When the cross section of the second pipe body is in the expanded state and the pipe wall is in the solidified state, the second pipe body is used for reinforcing the inner wall of the well hole. The reinforcing device can modify the cross section shape of the well hole, reinforce the inner wall of the well hole, improve the well wall quality, reduce the accident rate of crossing and ensure smooth pipeline laying.

Description

Technical Field

[0001] This application relates to the field of pipeline construction technology, and in particular to reinforcement devices and construction methods. Background Technology

[0002] Pipeline crossing construction technology is one of the key technologies in pipeline network construction. The drilling method is often used for pipeline crossing construction. Through processes such as directional drilling, borehole enlargement and pullback, pipeline crossing can be completed without excavating the surface. It is particularly suitable for crossing complex environments such as highways, railways and rivers.

[0003] Current well-drilling methods for pipeline crossing involve first quickly constructing a pilot hole using a directional drill bit, then repeatedly enlarging the wellbore with a reamer to meet pipeline requirements, and finally inserting the pipeline into the wellbore using a push-pull method. However, due to the long construction period and the heavy weight of the reamers, the wellbore often develops a cross-sectional shape that is wider at the bottom than the top after multiple enlargements. This can easily lead to drill string jamming, wellbore collapse and instability, causing pipeline crossing accidents and affecting pipeline laying. Summary of the Invention

[0004] Therefore, it is necessary to provide a reinforcement device and construction method to address the problems of well section deformation during pipeline crossing construction, which leads to pipeline crossing accidents and affects pipeline laying.

[0005] A reinforcement device is used in pipeline crossing construction. The reinforcement device is used to modify the cross-sectional shape of a wellbore and reinforce the inner wall of the wellbore. The reinforcement device includes:

[0006] A first pipe body is used to pass through the wellbore;

[0007] The second tube is sleeved outside the first tube. The cross section of the second tube perpendicular to the extension direction has a folded state and an expanded state. The tube wall of the second tube has a flexible state and a solidified state. After the cross section of the second tube is in the expanded state, the tube wall of the second tube gradually changes from the flexible state to the solidified state.

[0008] At least one expansion body is disposed in the portion of the first pipe body placed inside the wellbore and communicates with the first pipe body. The expansion body has a first state and a second state. The volume of the expansion body in the second state is greater than the volume of the expansion body in the first state, and the volume of the expansion body in the second state is adjustable.

[0009] The second pipe body is in contact with the inner wall of the well hole when the cross section of the second pipe body is in the expanded state and the pipe wall is in the flexible state, the expansion body is controllably changed from the first state to the second state, and the first pipe body is controllably moved along the extension direction of the well hole, so that the expansion body is used to modify the cross section shape of the well hole; the second pipe body is used to reinforce the inner wall of the well hole when the cross section of the second pipe body is in the expanded state and the pipe wall is in the solidified state.

[0010] In an embodiment of the present application, a sealing mechanism is further included, and the end of the second pipe body is connected with the first pipe body through the sealing mechanism; the sealing mechanism comprises a body part, the body part is sleeved on the outer wall of the first pipe body, the first pipe body is movable relative to the body part along the axial direction of the body part, one end of the body part is arranged inside the second pipe body, and the body part is sealingly connected with the first pipe body and the second pipe body.

[0011] In an embodiment of the present application, the body part has a fluid passing space between the inner wall of the part arranged inside the second pipe body and the outer wall of the first pipe body, a first fluid medium is input into the fluid passing space through the body part, so that the cross section of the second pipe body is gradually changed from the folded state to the expanded state; or the first fluid medium is continuously input into the fluid passing space through the body part at one end of the second pipe body, the temperature of the first fluid medium is 80-120°C, and the first fluid medium flowing through the second pipe body is continuously discharged from another body part through another fluid passing space at the other end of the second pipe body, so that the cross section of the second pipe body is gradually changed from the folded state to the expanded state, and the pipe wall of the second pipe body is gradually changed from the flexible state to the solidified state.

[0012] In an embodiment of the present application, the first pipe body is used to input a second fluid medium, so that the expansion body is changed from the first state to the second state; the density of the second fluid medium is greater than the density of the first fluid medium.

[0013] In an embodiment of the present application, the inner wall of the body part and the fitting part of the first pipe body is provided with a medium groove, and the medium groove is used to arrange a lubricating medium.

[0014] In an embodiment of the present application, the medium groove is spirally arranged around the axial direction of the body part, one end of the medium groove is a lubricating medium inlet, and the other end is a lubricating medium outlet; when the first pipe body is moved relative to the body part along the axial direction of the body part, the lubricating medium inlet continuously injects the lubricating medium, the lubricating medium flows through the medium groove, and then is output from the lubricating medium outlet.

[0015] In one embodiment of the present application, the pipe wall of the second pipe body comprises a first pipe wall layer, a second pipe wall layer and a third pipe wall layer arranged in sequence from inside to outside in the radial direction, the first pipe wall layer is used for sealing the second pipe body, the second pipe wall layer is used for arranging the mixture of cement and fine sand or thermosetting resin, and the outer wall of the third pipe wall layer is used for arranging the lubricating medium.

[0016] In one embodiment of the present application, a third pipe body is further included, the third pipe body is sleeved outside the second pipe body when the second pipe body is in the folded state, and the pipe wall of the third pipe body is cracked when the second pipe body is in the expanded state.

[0017] In one embodiment of the present application, the outer wall of the third pipe body is provided with a plurality of groove groups, the grooves in the same group are arranged at intervals in the axial direction of the third pipe body, and the grooves in adjacent groups are arranged at intervals and staggered in the circumferential direction of the third pipe body, and the pipe wall of the third pipe body is cracked and forms a mesh structure when the second pipe body is in the expanded state.

[0018] A construction method is executed by the reinforcing device described above, and the construction method comprises:

[0019] The first pipe body and the second pipe body which form an entirety are inserted into the well hole, at this time, the cross section of the second pipe body is in a folded state, and the pipe wall is in a flexible state;

[0020] A first fluid medium is input into the second pipe body, so that the cross section of the second pipe body is changed from the folded state to the expanded state, and a second fluid medium is input into the first pipe body, so that the expansion body is changed from the first state to the second state;

[0021] When the pipe wall of the second pipe body is in the flexible state, the first pipe body is moved along the extension direction of the well hole, and the expansion body modifies the cross section shape of the well hole;

[0022] When the pipe wall of the second pipe body is in the solidified state, the second pipe body reinforces the inner wall of the well hole.

[0023] In one embodiment of the present application, the second pipe wall layer of the second pipe body is provided with the mixture of cement and fine sand, and before the step of inserting the first pipe body and the second pipe body which form an entirety into the well hole, at this time, the cross section of the second pipe body is in the folded state, and the pipe wall is in the flexible state, a step of spraying the second pipe wall layer is further included.

[0024] In an embodiment of the present application, the second pipe wall layer of the second pipe body is provided with thermosetting resin, the first fluid medium is input into the second pipe body to make the cross section of the second pipe body change from the folded state to the expanded state, and the second fluid medium is input into the first pipe body to make the expansion body change from the first state to the second state, which includes continuously inputting the first fluid medium into one end of the second pipe body, the temperature of the first fluid medium being 80-120°C, and continuously outputting the first fluid medium from the other end of the second pipe body to make the cross section of the second pipe body gradually change from the folded state to the expanded state and make the pipe wall of the second pipe body gradually change from the flexible state to the solidified state.

[0025] In an embodiment of the present application, when the pipe wall of the second pipe body is in the flexible state, the first pipe body is moved along the extension direction of the well hole, and the expansion body modifies the cross sectional shape of the well hole, which includes that the volume of the expansion body matches the preset inner diameter size of the well hole, and when the expansion body is stuck during the movement of the first pipe body along the extension direction of the well hole, the volume of the expansion body is reduced to make the expansion body enter the stuck position and the volume of the expansion body is increased to open the stuck position.

[0026] The reinforcing device described above includes the first pipe body, the second pipe body and at least one expansion body, when the cross section of the second pipe body is in the expanded state and the pipe wall thereof is in the flexible state, the second pipe body is attached to the inner wall of the well hole, the expansion body is controllably changed from the first state to the second state, and the volume of the expansion body is adjustable. The first pipe body is controllably moved along the extension direction of the well hole, the expansion body can modify the cross sectional shape of the well hole, and the deformation problem of the inner wall of the well hole is improved to make the cross sectional shape of the well hole meet the subsequent pipeline laying requirements. Then, when the cross section of the second pipe body is in the expanded state and the pipe wall thereof is in the solidified state, the second pipe body can reinforce the inner wall of the well hole to make the cross section of the well hole keep the modified shape, prevent the well wall from collapsing and losing stability, and reduce the occurrence of pipeline crossing accidents, so that the subsequent pipeline laying process is more smooth, the construction efficiency of the pipeline crossing is improved, and the construction quality of the pipeline crossing is ensured.

[0027] The construction method described above is executed by the reinforcing device described above and has the same beneficial effects as the reinforcing device, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 FIG. 1 is a schematic view of the reinforcing device of the present application placed in the well hole, in which the cross section of the second pipe body is in the folded state and the expansion body is in the first state.

[0029] Figure 2 FIG. 3 is a schematic view of the reinforcing device of the present application placed in the well hole, in which the cross section of the second pipe body is in the expanded state and the expansion body is in the second state.

[0030] Figure 3 Figure 1 is a schematic view of a wellbore in which the present application is used. Figure 2 Figure 2 is a schematic view of the first pipe body of the present application.

[0031] Figure 4 Figure 3 is a schematic view of the second pipe body of the present application in a folded state.

[0032] Figure 5 Figure 4 is a schematic view of the second pipe body of the present application in another folded state.

[0033] Figure 6 Figure 5 is a schematic view of the second pipe body of the present application in an expanded state.

[0034] Figure 7 Figure 6 is a schematic view of the expansion body of the present application.

[0035] Figure 8 Figure 7 is a schematic view of the third pipe body of the present application. Figure 1 .

[0036] Figure 9 Figure 8 is a schematic view of the third pipe body of the present application. Figure 2 .

[0037] Figure 10 Figure 9 is a schematic view of the second pipe body of the present application in an expanded state and the expansion body in a second state.

[0038] Figure 11 Figure 10 is a schematic view of the expansion body of the present application perpendicular to the axis of the first pipe body.

[0039] BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 100, wellbore;

[0041] 1, first pipe body; 101, inner liner; 102, reinforcing layer; 103, protective layer;

[0042] 2, second pipe body; 201, first pipe wall layer; 202, second pipe wall layer; 203, third pipe wall layer;

[0043] 3, expansion body; 301, inner layer; 302, intermediate layer; 303, outer layer; 304, protrusion; 305, gas passage;

[0044] 4, body portion; 401, medium groove; 402, large diameter portion; 403, transition portion; 404, small diameter portion; 405, stuffing box; 406, retainer ring; 407, lubricating medium inlet; 408, lubricating medium outlet; 409, connector;

[0045] 5. fluid passage space;

[0046] 6. third pipe body; 601. groove;

[0047] 7. coil holder;

[0048] 8. clamp;

[0049] 9. support;

[0050] 10. locking ring. DETAILED DESCRIPTION

[0051] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways beyond the specific embodiments described and claimed herein. It is therefore intended that the present application not be limited in scope to the specific embodiments disclosed but rather that the scope of the present application be measured by the broadest permissible interpretation of the claims.

[0052] Referring to Figures 1-11 As shown in the drawings, the reinforcing device provided by an embodiment of the present application is applied to pipeline crossing construction, and the reinforcing device is used to trim the cross-sectional shape of a borehole 100 and reinforce the inner wall of the borehole 100. The reinforcing device comprises a first pipe body 1, a second pipe body 2 and at least one expansion body 3. The first pipe body 1 is used to cross the borehole 100. The second pipe body 2 is sleeved outside the first pipe body 1. The cross section of the second pipe body 2 perpendicular to the extending direction has a folded state and an expanded state. The pipe wall of the second pipe body 2 has a flexible state and a solidified state. After the cross section of the second pipe body 2 is in the expanded state, the pipe wall of the second pipe body 2 gradually changes from the flexible state to the solidified state. The at least one expansion body 3 is arranged on the part of the first pipe body 1 arranged in the borehole 100 and is in communication with the first pipe body 1. The expansion body 3 has a first state and a second state. The volume of the expansion body 3 in the second state is greater than the volume of the expansion body 3 in the first state, and the volume of the expansion body 3 in the second state is adjustable. When the cross section of the second pipe body 2 is in the expanded state and the pipe wall of the second pipe body 2 is in the flexible state, the second pipe body 2 is attached to the inner wall of the borehole 100. The expansion body 3 is controllably changed from the first state to the second state, and the first pipe body 1 is controllably moved along the extending direction of the borehole 100, so that the expansion body 3 is used to trim the cross-sectional shape of the borehole 100. When the cross section of the second pipe body 2 is in the expanded state and the pipe wall of the second pipe body 2 is in the solidified state, the second pipe body 2 is used to reinforce the inner wall of the borehole 100.

[0053] The reinforcing device can control the first pipe body 1 to move along the extension direction of the well hole 100, so that the expansion body 3 can trim the cross-sectional shape of the well hole 100, improve the deformation problem of the inner wall of the well hole 100, and make the cross-sectional shape of the well hole 100 meet the subsequent pipeline laying requirements. Then, when the cross section of the second pipe body 2 is in the expanded state and the pipe wall is in the solidified state, the second pipe body 2 can reinforce the inner wall of the well hole 100, so that the cross section of the well hole 100 can keep the trimmed shape, prevent the well wall from collapsing and losing stability, reduce the occurrence of pipeline crossing accidents, and thus make the subsequent pipeline laying process more smooth, improve the construction efficiency of the pipeline crossing, and ensure the construction quality of the pipeline crossing.

[0054] The reinforcing device of the present application is used after the reaming process of the pipeline crossing construction. The reinforcing device comprises a first pipe body 1 which can pass through the well hole 100 to trim the cross-sectional shape of the well hole 100 and reinforce the well wall. Referring to Figures 1-2 、 Figure 10 As shown in the figure, the length of the first pipe body 1 is not limited, and after the first pipe body 1 passes through the well hole 100, the two ends of the first pipe body 1 are placed outside the well hole 100, and the two ends of the first pipe body 1 are arranged around the coil pipe rack 7. By operating the coil pipe rack 7, the first pipe body 1 can be driven to reciprocate along the extension direction of the well hole 100 to adjust the position of the first pipe body 1 inside the well hole 100.

[0055] In one embodiment, the first pipe body 1 is a fiber-reinforced composite pipe. Referring to Figures 4-6 As shown in the figure, the first pipe body 1 comprises an inner liner 101, a reinforcing layer 102 and a protective layer 103 which are arranged in the radial direction from inside to outside. The inner liner 101 is made of PE (Polyethylene) material, the reinforcing layer 102 is wound by fibers, and the reinforcing layer 102 is the pressure-bearing structure of the first pipe body 1. The protective layer 103 is also made of PE material, which has the characteristics of light weight, corrosion resistance, and good compression and shock resistance, and can effectively protect the inner liner 101 and the reinforcing layer 102.

[0056] The reinforcing device further comprises a second pipe body 2 which is a support pipe. The second pipe body 2 is arranged outside the first pipe body 1. Specifically, the second pipe body 2 is connected to the first pipe body 1 by assembly. Then, the two ends of the second pipe body 2 are fixed to the first pipe body 1 by the hoop 8, and the number of hoops 8 is not limited. The length of the second pipe body 2 is less than the length of the first pipe body 1, but the length of the second pipe body 2 should be greater than the extension length of the well hole 100. After the second pipe body 2 passes through the well hole 100 with the first pipe body 1, the two ends of the second pipe body 2 are placed outside the well hole 100 to facilitate subsequent construction operations.

[0057] The tube wall of the second tube body 2 has elasticity, the cross section of the second tube body 2 (hereinafter referred to as the cross section of the second tube body 2) perpendicular to the extending direction of the second tube body 2 has a folded state and an expanded state, the radial dimension of the second tube body 2 is significantly larger than the radial dimension of the first tube body 1, as shown in Figure 4 and Figure 5 When passing through the wellbore 100, the cross section of the second tube body 2 is in the folded state, at this time, the tube wall of the second tube body 2 is folded inward to facilitate the passing operation. The cross section of the second tube body 2 is in the folded state, the folded form of the tube wall of the second tube body 2 is not limited, for example, it can be Figure 4 , it can also be Figure 5 .

[0058] As shown in Figure 6 , when the cross section of the second tube body 2 is in the expanded state, the tube wall of the second tube body 2 is expanded to fit the inner wall of the wellbore 100, at this time, the cross section shape of the second tube body 2 is adapted to the cross section shape of the wellbore 100.

[0059] The tube wall of the second tube body 2 has a flexible state and a solidified state, when the tube wall of the second tube body 2 is in the flexible state, the second tube body 2 can be folded inward to form a folded state, which is convenient for passing through the wellbore 100. After the second tube body 2 is in the expanded state, and the tube wall of the second tube body 2 is in the flexible state, the tube wall of the second tube body 2 can better fit the inner wall of the wellbore 100, so as to facilitate the subsequent inner wall finishing and well wall reinforcing of the wellbore 100. After the second tube body 2 is in the expanded state, the tube wall of the second tube body 2 gradually changes from the flexible state to the solidified state, when the tube wall of the second tube body 2 is in the solidified state, the tube wall of the second tube body 2 becomes hard and has high structural strength, which can reliably support and reinforce the inner wall of the wellbore 100, so that the wellbore 100 can maintain the cross section shape after finishing, and avoid the well wall from collapsing and deforming again.

[0060] The reinforcing device further comprises an expansion body 3, the expansion body 3 is provided with at least one, the number of the expansion body 3 provided can be determined according to the length of the well hole 100 and the length of the first pipe body 1, for example, the expansion body 3 can be provided with 1, 2, 3, 5, etc. When the expansion body 3 is provided with multiple, multiple expansion bodies 3 are arranged at intervals, and the shape structure of each expansion body 3 can be the same or different, for example, the expansion body 3 can be a spherical structure, a cylindrical structure, or a petal-like structure with undulating protrusions 304 on the surface, forming airflow channels 305 between adjacent protrusions 304. When the expansion body 3 is provided with multiple, multiple positions of the inner wall of the well hole 100 can be modified at one time, improving the efficiency of well wall modification. The expansion body 3 is arranged on the part of the first pipe body 1 placed in the well hole 100 and communicates with the first pipe body 1. The expansion body 3 can be integrally formed with the first pipe body 1, or connected with the first pipe body 1 by assembly. In one embodiment, the expansion body 3 can be an expansion ball, at this time the whole expansion body 3 is a hollow spherical or cylindrical structure.

[0061] The side wall of the expansion body 3 has a certain elasticity, the expansion body 3 has a first state and a second state, the first state of the expansion body 3 is its natural state, the volume of the expansion body 3 in the second state is larger than the volume of the expansion body 3 in the first state, the volume of the expansion body 3 in the second state can be adjusted according to the inner wall condition of the well hole 100, to adaptively modify different positions inside the well hole 100. Specifically, in the process of modifying the cross-sectional shape of the well hole 100, the expansion body 3 is in the second state, but the volume of the expansion body 3 can be increased or decreased according to the deformation of the cross section of the well hole 100.

[0062] In one embodiment, the expansion body 3 is connected with the first pipe body 1 by assembly, the expansion body 3 comprises an inner layer 301, an intermediate layer 302 and an outer layer 303, which are arranged in order from inside to outside along the radial direction. Among them, the inner layer 301 is connected with the inner lining layer 101, the intermediate layer 302 is connected with the reinforcing layer 102, and the outer layer 303 is connected with the protective layer 103.

[0063] After the first pipe body 1, the second pipe body 2 and the expansion body 3 pass into the well hole 100, the cross section of the second pipe body 2 is changed from the folded state to the expanded state, and when the pipe wall of the second pipe body 2 is in the flexible state, the outer wall of the second pipe body 2 is attached to the inner wall of the well hole 100 to adapt to the shape of the inner wall of the well hole 100. Then, the expansion body 3 is controllably changed from the first state to the second state, and before the pipe wall of the second pipe body 2 is in the solidified state, the first pipe body 1 is controllably moved along the extension direction of the well hole 100, and the expansion body 3 moves along the extension direction of the well hole 100 together with the first pipe body 1, and in this process, the outer wall of the expansion body 3 can abut or prop open the jammed position of the inner wall of the well hole 100, so as to restore the cross section shape of the well hole 100 to the required shape, and realize the trimming of the cross section shape of the well hole 100 by the expansion body 3. When the cross section of the second pipe body 2 is in the expanded state and the pipe wall is in the solidified state, the second pipe body 2 can reliably support and reinforce the inner wall of the well hole 100, avoid the deformation of the well wall again, significantly reduce the accident rate of pipe crossing, and at the same time, can isolate the external mud from entering the inside of the well hole 100, and avoid the influence on the pipe back dragging construction.

[0064] In an embodiment of the present application, the reinforcing device further comprises a sealing mechanism, and the end of the second pipe body 2 is connected with the first pipe body 1 through the sealing mechanism; the sealing mechanism comprises a body part 4, the body part 4 is sleeved on the outer wall of the first pipe body 1, the first pipe body 1 can move relative to the body part 4 along the axial direction of the body part 4, one end of the body part 4 towards the second pipe body 2 is placed inside the second pipe body 2, and the body part 4 is sealingly connected with the first pipe body 1 and the second pipe body 2.

[0065] The reinforcing device further comprises a sealing mechanism, and the end of the second pipe body 2 is connected with the first pipe body 1 through the sealing mechanism, that is, both ends of the second pipe body 2 are connected with the first pipe body 1 through the sealing mechanism. After the second pipe body 2 is sleeved and assembled with the first pipe body 1, the two ends of the second pipe body 2 are fixed with the first pipe body 1 through the hoop 8, so that the second pipe body 2 can pass through the well hole 100 together with the first pipe body 1. After the first pipe body 1 and the second pipe body 2 pass into the well hole 100, the hoop 8 is removed, the end of the second pipe body 2 is connected with the first pipe body 1 through the sealing mechanism, and at this time, the first pipe body 1 can move relative to the body part 4 along the axial direction of the body part 4 to drive the expansion body 3 to move in the well hole 100.

[0066] Reference Figures 2-3As shown, the plugging mechanism comprises a body part 4, which is in a cylindrical structure as a whole, is sleeved on the outer wall of the first pipe body 1, is arranged inside the second pipe body 2 at one end thereof, and is sealingly connected to the first pipe body 1 and the second pipe body 2. In one embodiment, the part of the body part 4 that cooperates with the first pipe body 1 is attached to the outer wall of the first pipe body 1, so as to achieve the sealing connection between the inner wall of the body part 4 and the outer wall of the first pipe body 1. Moreover, the part of the body part 4 that cooperates with the second pipe body 2 is attached to the inner wall of the second pipe body 2, so as to achieve the sealing connection between the outer wall of the body part 4 and the inner wall of the second pipe body 2.

[0067] In one embodiment, the body part 4 comprises a large-diameter part 402, a transition part 403 and a small-diameter part 404, the large-diameter part 402 is connected to the small-diameter part 404 through the transition part 403, and the transition part 403 is in a conical structure. The radial dimension of the large-diameter part 402 is greater than that of the small-diameter part 404, the body part 4 is connected to the second pipe body 2 through the large-diameter part 402, and the body part 4 is connected to the first pipe body 1 through the small-diameter part 404.

[0068] In one embodiment, the inner wall of the large-diameter part 402 is arranged in spaced relation to the outer wall of the first pipe body 1, and the outer wall of the large-diameter part 402 is attached to the inner wall of the second pipe body 2, so that the large-diameter part 402 can prop open the pipe wall at the end of the second pipe body 2. Specifically, the large-diameter part 402 is sealingly connected to the second pipe body 2 through a locking ring 10, which is arranged outside the second pipe body 2 and tightly connects the second pipe body 2 to the large-diameter part 402. In one embodiment, the locking ring 10 is in a split clamp structure, the split structure of the locking ring 10 can be locked through fasteners such as bolts, thereby achieving the sealing connection of the large-diameter part 402 to the second pipe body 2.

[0069] In one embodiment, the small-diameter part 404 is sleeved on the outer wall of the first pipe body 1, and the inner wall of the small-diameter part 404 is attached to the outer wall of the first pipe body 1. A ring groove structure is arranged at one end of the small-diameter part 404 away from the large-diameter part 402, a packing gland 405 is arranged inside the ring groove structure, and a retaining ring 406 is further arranged at one end of the ring groove structure away from the large-diameter part 402, the retaining ring 406 is connected to the end face of the small-diameter part 404 and tightly presses the packing gland 405, so as to position the packing gland 405. The packing gland 405 can reliably seal the connection position of the small-diameter part 404 to the first pipe body 1.

[0070] In one embodiment, the bottom of the body part 4 is provided with a support 9 for supporting and fixing the plugging mechanism, so as to facilitate the installation of the second pipe body 2 to the first pipe body 1 and the subsequent trimming process. Specifically, the support 9 is supported at the bottom of the small-diameter part 404.

[0071] In one of the embodiments, the body part 4 of the blocking mechanism is in a split structure, for example, the body part 4 includes two parts split along the vertical direction, so as to facilitate the cooperation and installation of the body part 4 with the first pipe body 1 and the second pipe body 2. Moreover, after the assembly of the two split parts of the body part 4, the connection part is sealed.

[0072] In one of the embodiments of the present application, the body part 4 has a fluid passing space 5 between the inner wall of the part placed in the second pipe body 2 and the outer wall of the first pipe body 1, the first fluid medium is input into the fluid passing space 5 through the body part 4, so as to gradually change the cross section of the second pipe body 2 from the folded state to the expanded state; or at one end of the second pipe body 2, the first fluid medium is continuously input into the fluid passing space 5 through the body part 4, the temperature of the first fluid medium is 80-120℃, at the other end of the second pipe body 2, the first fluid medium flowing through the second pipe body 2 is continuously discharged from the other body part 4 through the other fluid passing space 5, so as to gradually change the cross section of the second pipe body 2 from the folded state to the expanded state, and gradually change the pipe wall of the second pipe body 2 from the flexible state to the solidified state.

[0073] Referring to Figure 3 As shown in the figure, the part of the body part 4 placed in the second pipe body 2 is a large diameter part 402 of the body part 4, the outer wall of the large diameter part 402 is in contact with the inner wall of the second pipe body 2, and the inner wall of the large diameter part 402 is spaced apart from the outer wall of the first pipe body 1, so that the large diameter part 402 props open the pipe wall of the end part of the second pipe body 2. In one of the embodiments, the inner wall of the large diameter part 402 and the transition part 403 is spaced apart from the outer wall of the first pipe body 1, and the fluid passing space 5 is in communication with the inside of the second pipe body 2, and the fluid passing space 5 is adapted to pass the first fluid medium. Specifically, the connecting head 409 is arranged on the side wall of the transition part 403.

[0074] In one of the embodiments, the first fluid medium can enter the fluid passing space 5 through the connecting head 409, and then enter the inside of the second pipe body 2, so as to gradually change the cross section of the second pipe body 2 from the folded state to the expanded state.

[0075] In one of the embodiments, at one end of the second tube body 2, the first fluid medium can continuously enter the fluid passing space 5 through the connecting head 409 at the end of the second tube body 2, the temperature of the first fluid medium is 80-120℃, at the other end of the second tube body 2, the first fluid medium flowing through the second tube body 2 continuously discharges from the connecting head 409 through the fluid passing space 5 at the end of the second tube body 2, that is, the first fluid medium of high temperature and circulation is introduced into the second tube body 2, so that the cross section of the second tube body 2 gradually changes from the folded state to the expanded state, and the tube wall of the second tube body 2 gradually changes from the flexible state to the solidified state. The temperature of the first fluid medium can be selected according to the solidification temperature of the second tube body 2, for example, it can be 80℃, 85℃, 90℃, 100℃, 120℃, etc. At this time, the expansion body 3 can be provided with one, and the expansion body 3 is a petal-like structure with undulating protrusions 304 on the surface, and the over-air flow channel 305 is formed between adjacent protrusions 304, and the first fluid medium is suitable for passing through the over-air flow channel 305, as shown in Figure 11 Alternatively, the expansion body 3 can also be provided with multiple, such as two, three, etc., each expansion body 3 adopts a petal-like structure with undulating protrusions 304 on the surface, and the over-air flow channel 305 is formed between adjacent protrusions 304, and the protrusions 304 of adjacent expansion bodies 3 are arranged in a circumferential staggered manner, so that the first fluid medium can pass through the over-air flow channel 305 of each expansion body 3.

[0076] In one of the embodiments, the first fluid medium is air, and the connecting head 409 is used for injecting and discharging air to change the state of the cross section of the second tube body 2.

[0077] In other embodiments, by changing the structure, only the inner wall of the large diameter part 402 and the outer wall of the first tube body 1 have a fluid passing space 5, the fluid passing space 5 is in communication with the inside of the second tube body 2, and the first fluid medium can also be input into the inside of the second tube body 2 or discharged from the first fluid medium in the second tube body 2.

[0078] In one embodiment of the present application, the first tube body 1 is used to input the second fluid medium to change the expansion body 3 from the first state to the second state; the density of the second fluid medium is greater than the density of the first fluid medium.

[0079] The inside of the first tube body 1 can input the second fluid medium, and since the expansion body 3 is in communication with the first tube body 1, the second fluid medium will enter the expansion body 3 to change the expansion body 3 from the first state to the second state. In one of the embodiments, both ends of the first tube body 1 are arranged around the coil holder 7, and the coil holder 7 is provided with an openable / closable interface, the end opening of the first tube body 1 is in communication with the interface of the coil holder 7, and the second fluid medium can be input into the first tube body 1 through the interface.

[0080] In one of the embodiments, the second fluid medium has a density greater than that of the first fluid medium. The second tube body 2 is adapted to input the first fluid medium so that the cross section of the second tube body 2 gradually changes from the folded state to the expanded state, and the first tube body 1 is adapted to input the second fluid medium so that the expansion body 3 changes from the first state to the second state. Thus, the interior of the expansion body 3 is the second fluid medium, and the exterior of the expansion body 3 is the first fluid medium. The expansion body 3 is moved along the extension direction of the wellbore 100 under the drive of the first tube body 1 to trim the cross section shape of the wellbore 100. When the expansion body 3 moves to the jamming position, the expansion body 3 is not easily deformed due to the jamming position because the second fluid medium has a greater density than the first fluid medium. Instead, the expansion body 3 is jammed at the jamming position and cannot move, so that the existence of the jamming position can be found, and corresponding measures can be taken to trim the jamming position and ensure the trimming effect on the inner wall of the wellbore 100.

[0081] In one of the embodiments, the second fluid medium is water or hydraulic oil.

[0082] In one of the embodiments of the present application, the inner wall of the portion of the body part 4 that cooperates with the first tube body 1 is provided with a medium groove 401 for setting a lubricating medium.

[0083] Referring to Figure 3 As shown in the figure, the portion of the body part 4 that cooperates with the first tube body 1 is a small-diameter part 404, and the inner wall of the small-diameter part 404 is provided with a medium groove 401 for setting a lubricating medium, such as grease. When the cross section shape of the wellbore 100 is trimmed, the first tube body 1 is moved relative to the body part 4 under the drive of the coil holder 7, and by setting the lubricating medium between the first tube body 1 and the small-diameter part 404, the resistance of the first tube body 1 to movement can be reduced, the first tube body 1 can be kept to move flexibly relative to the body part 4, and the construction difficulty is reduced.

[0084] In one of the embodiments of the present application, the medium groove 401 is spirally arranged around the axial direction of the body part 4, one end of the medium groove 401 is a lubricating medium inlet 407, and the other end is a lubricating medium outlet 408; when the first tube body 1 moves relative to the body part 4 along the axial direction of the body part 4, the lubricating medium inlet 407 continuously injects the lubricating medium, the lubricating medium flows through the medium groove 401, and then is output from the lubricating medium outlet 408.

[0085] In one of the embodiments, the medium groove 401 is spirally arranged around the axis of the small-diameter part 404, forming a spiral groove structure. One end of the medium groove 401 is provided with an openable / closable lubricating medium inlet 407, and the other end is provided with an openable / closable lubricating medium outlet 408. When the first pipe body 1 needs to be moved, the lubricating medium inlet 407 and the lubricating medium outlet 408 are opened, and lubricating medium is continuously injected into the lubricating medium inlet 407 by a pump body, and the lubricating medium flows through the medium groove 401 and is then output from the lubricating medium outlet 408, thereby improving the lubricating effect between the first pipe body 1 and the body part 4, reducing the sliding friction between the first pipe body 1 and the body part 4, reducing the moving resistance of the first pipe body 1, and at the same time ensuring the sealing between the first pipe body 1 and the body part 4.

[0086] In one of the embodiments, the lubricating medium can also be pre-installed in the medium groove 401, and then the body part 4 and the first pipe body 1 are installed. At this time, it is not necessary to continuously inject the lubricating medium, which can also reduce the moving resistance of the first pipe body 1 to a certain extent and reduce the difficulty of construction operation.

[0087] In one of the embodiments of the present application, the pipe wall of the second pipe body 2 comprises a first pipe wall layer 201, a second pipe wall layer 202 and a third pipe wall layer 203 arranged in sequence from the inside to the outside in the radial direction, the first pipe wall layer 201 is used for sealing the second pipe body 2, the second pipe wall layer 202 is used for arranging the mixture of cement and fine sand or thermosetting resin, and the outer wall of the third pipe wall layer 203 is used for arranging the lubricating medium.

[0088] Referring to Figures 4-5 As shown in the figure, the pipe wall of the second pipe body 2 comprises a first pipe wall layer 201, a second pipe wall layer 202 and a third pipe wall layer 203, and the first pipe wall layer 201, the second pipe wall layer 202 and the third pipe wall layer 203 are arranged in sequence from the inside to the outside in the radial direction. The first pipe wall layer 201 is a sealing layer used for sealing the second pipe body 2, and the first pipe wall layer 201 is made of PE material. The second pipe wall layer 202 is a grid layer, and the second pipe wall layer 202 comprises a mesh structure composed of fiber material, and the mesh structure has a plurality of grids, and the mixture of cement and fine sand (gravel) or thermosetting resin is embedded in the grid. When the mixture of cement and fine sand is arranged in the grid of the second pipe wall layer 202, the second pipe wall layer 202 is a cement blanket, and the mixture is converted into cement mortar after being soaked, and a hard shell is formed after solidification. When the thermosetting resin is arranged in the grid of the second pipe wall layer 202, the thermosetting resin is solidified after being heated to form a hard shell. The third pipe wall layer 203 is a drag-reducing layer used for reducing the relative moving resistance between the second pipe body 2 and the external structure, and the third pipe wall layer 203 is made of PE material. In one of the embodiments, a plurality of groove structures can be arranged on the outer wall of the third pipe wall layer 203, and a lubricating medium such as lubricating grease is arranged in the groove structure to improve the drag-reducing effect.

[0089] In one of the embodiments, the inner wall of the first pipe wall layer 201 can also be pre-set with lubricating medium to reduce the frictional resistance when the first pipe body 1 moves along the extension direction of the borehole 100 relative to the second pipe body 2, facilitating the threading of the first pipe body 1 and the second pipe body 2, and the lubricating medium can also provide corrosion protection for the second pipe body 2.

[0090] In one of the embodiments, the second pipe body 2 is also provided with a pressure monitoring device to monitor in real time whether the expansion body 3 is stuck in the second pipe body 2. When the expansion body 3 moves with the first pipe body 1 in the borehole 100, if the expansion body 3 is stuck, the pressure monitoring device can monitor the local stuck position, and then the stuck position can be opened and trimmed by adjusting the volume of the expansion body 3 and the position of the first pipe body 1, improving the passability of the borehole 100.

[0091] In one of the embodiments, the first pipe wall layer 201, the second pipe wall layer 202 and the third pipe wall layer 203 can be formed into the second pipe body 2 by on-site assembly at the construction site, so as to spray and soak the mixture of cement and fine sand of the second pipe wall layer 202, and the spraying medium is water. Alternatively, a spraying pipeline can be pre-set inside the second pipe body 2 to spray and soak the mixture of cement and fine sand of the second pipe wall layer 202 when it is needed to pass through the borehole 100.

[0092] In one of the embodiments of the application, the reinforcing device further comprises a third pipe body 6, when the second pipe body 2 is in the folded state, the third pipe body 6 is sleeved outside the second pipe body 2, and when the second pipe body 2 is in the expanded state, the pipe wall of the third pipe body 6 is expanded and cracked.

[0093] Referring to Figures 1-2 , Figures 4-5 The reinforcing device further comprises a third pipe body 6, before passing through the borehole 100, the first pipe body 1 and the second pipe body 2 are sleeved and assembled, and then the second pipe body 2 is sleeved in the third pipe body 6, at this time the lubricating medium of the third pipe wall layer 203 can reduce the resistance of the relative movement of the second pipe body 2 and the third pipe body 6. When passing through the borehole 100, the first pipe body 1, the second pipe body 2 and the third pipe body 6 form an integral structure to pass together into the inside of the borehole 100, and the third pipe body 6 can further protect the outer wall of the second pipe body 2 and reduce the wear of the outer wall. The third pipe body 6 is made of PE material. After the third pipe body 6 and the second pipe body 2 are sleeved and assembled, the two ends of the third pipe body 6 can be fixed to the second pipe body 2 or the first pipe body 1 by the clamp 8, which is not limited in the application.

[0094] When the second pipe body 2 is in the folded state, the third pipe body 6 is sleeved outside the second pipe body 2, and the first pipe body 1, the second pipe body 2 and the third pipe body 6 can be together penetrated into the inside of the well hole 100, in this process, the third pipe body 6 can protect the second pipe body 2, and then when the second pipe body 2 is in the expanded state, the pipe wall of the third pipe body 6 is expanded and ruptured, so that the outer wall of the second pipe body 2 adapts and fits the inner wall of the well hole 100, and then the subsequent finishing process is carried out.

[0095] In order to facilitate the penetration of the well hole 100, the first pipe body 1 is significantly longer than the second pipe body 2 and the third pipe body 6, the second pipe body 2 and the third pipe body 6 are fixed to the middle part of the first pipe body 1, and one end of the first pipe body 1 (the part not provided with the second pipe body 2 and the third pipe body 6) is adapted to enter the well hole 100 first, thereby driving the second pipe body 2 and the third pipe body 6 to enter the well hole 100 together.

[0096] In an embodiment of the present application, the outer wall of the third pipe body 6 is provided with a plurality of groove groups, the grooves 601 in the same group are arranged at intervals along the axial direction of the third pipe body 6, and the grooves 601 in adjacent groups are arranged at intervals and staggered in the circumferential direction of the third pipe body 6, and when the second pipe body 2 is in the expanded state, the pipe wall of the third pipe body 6 is expanded and ruptured to form a mesh structure.

[0097] Referring to Figures 8-9 As shown in the figure, the outer wall of the third pipe body 6 is provided with a plurality of groove groups, each groove group includes a plurality of grooves 601, the grooves 601 are stress grooves, and the number of groove groups and the number of grooves 601 in each groove group are not specifically limited and can be set according to the outer wall area of the third pipe body 6 and the construction requirements. The grooves 601 are concave from the outer wall of the third pipe body 6, and when the third pipe body 6 is not expanded and ruptured, the grooves 601 are not connected to the outer wall and the inner wall of the third pipe body 6.

[0098] The grooves 601 in the same group are arranged at intervals along the axial direction of the third pipe body 6, and the grooves 601 in adjacent groups are arranged at intervals and staggered in the circumferential direction of the third pipe body 6, and this distribution form of the grooves 601 makes the pipe wall of the third pipe body 6 be expanded and ruptured when the second pipe body 2 is in the expanded state, and the pipe wall of the third pipe body 6 forms a mesh structure, at this time, the third pipe body 6 participates in reinforcing the inner wall of the well hole 100, and improves the reinforcing effect on the well wall.

[0099] The reinforcing device of the present application is used after the reaming process of the pipeline penetration construction, the reinforcing device can modify the cross-sectional shape of the well hole 100 and reinforce the inner wall of the well hole 100, improve the well wall quality, improve the smoothness of the inner wall of the well hole, facilitate the back-dragging operation of the steel long-distance pipeline, reduce the penetration accident rate, and ensure the smooth laying of the pipeline.

[0100] The present application also provides a construction method executed by the above reinforcing device, the construction method comprises:

[0101] inserting the first pipe body 1 and the second pipe body 2 into the well hole 100, at this time, the cross section of the second pipe body 2 is in the folded state, and the pipe wall is in the flexible state;

[0102] inputting the first fluid medium into the second pipe body 2, so that the cross section of the second pipe body 2 changes from the folded state to the expanded state, and inputting the second fluid medium into the first pipe body 1, so that the expansion body 3 changes from the first state to the second state;

[0103] moving the first pipe body 1 along the extension direction of the well hole 100 when the pipe wall of the second pipe body 2 is in the flexible state, and the expansion body 3 modifies the cross section shape of the well hole 100;

[0104] when the pipe wall of the second pipe body 2 is in the solidified state, the second pipe body 2 reinforces the inner wall of the well hole 100.

[0105] Through the above construction method, the first pipe body 1 is controllably moved along the extension direction of the well hole 100, so that the expansion body 3 can modify the cross section shape of the well hole 100, and the deformation problem of the inner wall of the well hole 100 is improved, so that the cross section shape of the well hole 100 meets the subsequent pipeline laying requirements. Then, when the cross section of the second pipe body 2 is in the expanded state and the pipe wall thereof is in the solidified state, the second pipe body 2 can reinforce the inner wall of the well hole 100, so that the cross section of the well hole 100 remains the modified shape, prevents the well wall from collapsing and losing stability, and reduces the occurrence of pipeline crossing accidents, thereby making the subsequent pipeline laying process more smooth, which is beneficial to improve the construction efficiency of pipeline crossing and ensure the construction quality of pipeline crossing.

[0106] In an embodiment of the present application, the second pipe wall layer 202 of the second pipe body 2 is provided with a mixture of cement and fine sand, and before the step of inserting the first pipe body 1 and the second pipe body 2 into the well hole 100, the second pipe wall layer 202 is also sprayed.

[0107] When the second pipe wall layer 202 of the second pipe body 2 is provided with a mixture of cement and fine sand, the cement and fine sand mixture of the second pipe wall layer 202 needs to be sprayed and soaked before the first pipe body 1 and the second pipe body 2 are inserted into the well hole 100, so that the second pipe wall layer 202 gradually changes from the flexible state to the solidified state, that is, the second pipe body 2 gradually changes from the flexible state to the solidified state.

[0108] In one of the embodiments, the cement and fine sand mixture of the second pipe wall layer 202 is sprayed and soaked before the second pipe body 2 is assembled with the first pipe body 1. Or in one of the embodiments, the cement and fine sand mixture is sprayed and soaked through the pre-set spraying pipeline inside the second pipe body 2 after the second pipe body 2 is assembled with the first pipe body 1.

[0109] In one embodiment of the present application, the second pipe wall layer 202 of the second pipe body 2 is provided with thermosetting resin, the first fluid medium is input into the second pipe body 2 to make the cross section of the second pipe body 2 change from the folded state to the expanded state, the second fluid medium is input into the first pipe body 1 to make the expansion body 3 change from the first state to the second state, and the step includes: continuously inputting the first fluid medium into one end of the second pipe body 2, the temperature of the first fluid medium being 80-120°C, and continuously outputting the first fluid medium from the other end of the second pipe body 2, so as to make the cross section of the second pipe body 2 gradually change from the folded state to the expanded state and make the pipe wall of the second pipe body 2 gradually change from the flexible state to the solidified state.

[0110] When the second pipe wall layer 202 of the second pipe body 2 is provided with thermosetting resin, the cross section of the second pipe body 2 can gradually change from the folded state to the expanded state, and the pipe wall of the second pipe body 2 can gradually change from the flexible state to the solidified state. Specifically, the first fluid medium is continuously input into one end of the second pipe body 2 (through the connecting head 409), the temperature of the first fluid medium being 80-120°C, and the first fluid medium is continuously output from the other end of the second pipe body 2 (through the connecting head 409), that is, the first fluid medium is circulated and at high temperature in the second pipe body 2, so as to make the cross section of the second pipe body 2 gradually change from the folded state to the expanded state and make the pipe wall of the second pipe body 2 gradually change from the flexible state to the solidified state.

[0111] This construction method can simplify the construction steps, make the pipe wall of the second pipe body 2 gradually change from the flexible state to the solidified state while the cross section of the second pipe body 2 gradually changes from the folded state to the expanded state, and improve the construction efficiency.

[0112] In one embodiment of the present application, when the pipe wall of the second pipe body 2 is in the flexible state, the first pipe body 1 is moved along the extension direction of the well hole 100, and the expansion body 3 is used to trim the cross section shape of the well hole 100, and the step includes: the volume of the expansion body 3 matches the preset inner diameter size of the well hole 100, when the expansion body 3 is stuck during the movement of the first pipe body 1 along the extension direction of the well hole 100, the volume of the expansion body 3 is reduced, the expansion body 3 enters the stuck position and the volume of the expansion body 3 is increased, so as to open and trim the stuck position.

[0113] When the expansion body 3 is in the second state, the volume of the expansion body 3 can match the preset inner diameter size of the well hole 100, so that the cross section shape of the well hole 100 after trimming meets the preset requirements. When the expansion body 3 is stuck during the movement of the first pipe body 1 along the extension direction of the well hole 100, it proves that the inner wall of the well hole 100 collapses at this position, at this time, the volume of the expansion body 3 is reduced, the expansion body 3 enters the stuck position and the volume of the expansion body 3 is increased, so as to open and trim the stuck position, thereby trimming the collapsed part of the well wall.

[0114] The construction method is described in detail below with reference to the drawings, taking the second pipe wall layer 202 provided with a mixture of cement and fine sand as an example:

[0115] First, the second pipe wall layer 202 is sprayed (the spraying medium is water) to allow the mixture of cement and fine sand to be soaked. The first pipe body 1, the second pipe body 2 (in a folded state) and the third pipe body 6 are sequentially connected by sleeving, and the first pipe body 1, the second pipe body 2 and the third pipe body 6 form an integrated structure through the clamps 8.

[0116] Then, the part of the first pipe body 1 that is not sleeved with the second pipe body 2 and the third pipe body 6 enters the wellbore 100 first, thereby driving the second pipe body 2 and the third pipe body 6 to enter the wellbore 100 together. In this process, the third pipe body 6 protects the second pipe body 2 to prevent its outer wall from being worn. The two ends of the first pipe body 1 are installed on the coil rack 7, all the clamps 8 are opened, and a plugging mechanism is arranged at the end of the second pipe body 2 to connect the two ends of the second pipe body 2 with the first pipe body 1 through the plugging mechanism.

[0117] The first fluid medium is input into the second pipe body 2 through the connecting head 409 to change the cross section of the second pipe body 2 from the folded state to the expanded state. In this process, the pipe wall of the third pipe body 6 is cracked by the second pipe body 2, and the outer wall of the second pipe body 2 is attached to the inner wall of the wellbore 100. Then, the second fluid medium is input into the first pipe body 1 to change the inflatable body 3 from the first state to the second state. When the inflatable body 3 is in the second state, its volume can reach the inner wall size of the preset wellbore 100, or it can be reduced in size to repair the well wall according to the collapse of the well wall.

[0118] After the cross section of the second pipe body 2 is in the expanded state and the pipe wall of the second pipe body 2 is in a flexible state (before the pipe wall of the second pipe body 2 is solidified), the first pipe body 1 and the inflatable body 3 are moved along the extension direction of the wellbore 100 through the coil rack 7. During the movement of the inflatable body 3, the collapse position (plugging position) of the inner wall of the wellbore 100 can be monitored through the pressure monitoring device in the second pipe body 2, and then the plugging position is repaired through the inflatable body 3. Specifically, when the inflatable body 3 is plugged, it proves that the inner wall of the wellbore 100 collapses at this position. At this time, the pressure in the first pipe body 1 is appropriately reduced to reduce the volume of the inflatable body 3, so that the inflatable body 3 enters the plugging position and then the volume of the inflatable body 3 is increased to open and repair the plugging position, improve the passability of the pipeline, and complete the repair of the plugging position. During the above process, the lubricating medium is continuously input into the medium groove 401 to ensure the flexible movement of the first pipe body 1. The inflatable body 3 is pulled multiple times along the extension direction of the second pipe body 2 to further shape the wellbore 100 and keep the internal passage smooth and the cross section regular.

[0119] When the pipe wall of the second pipe body 2 is in the solidified state, the pipe wall of the second pipe body 2 is hardened and reaches a certain strength, and the second pipe body 2 reinforces the inner wall of the well hole 100. The pressure in the second pipe body 2 is released, that is, the first fluid medium in the second pipe body 2 is released, and then the first pipe body 1 is removed from the second pipe body 2.

[0120] After that, the pipeline back dragging and other construction operations can be carried out. During the pipeline back dragging, the outer wall of the pipeline is in contact with the PE material of the inner wall of the second pipe body 2, and there is also a lubricating medium between the two, which can reduce the frictional resistance between the outer wall of the pipeline and the inner wall of the second pipe body 2, so that the pipeline back dragging construction can be carried out smoothly.

[0121] Next, the construction method will be described in detail by taking the second pipe wall layer 202 provided with thermosetting resin as an example:

[0122] First, the first pipe body 1, the second pipe body 2 (in the folded state) and the third pipe body 6 are sequentially sleeved and connected, and the first pipe body 1, the second pipe body 2 and the third pipe body 6 form an integral structure through the clamps 8.

[0123] After that, the part of the first pipe body 1 which is not sleeved with the second pipe body 2 and the third pipe body 6 enters the well hole 100 first, and then drives the second pipe body 2 and the third pipe body 6 to enter the well hole 100 together. In this process, the third pipe body 6 protects the second pipe body 2 to prevent its outer wall from being worn. The two ends of the first pipe body 1 are installed on the coil rack 7, all the clamps 8 are opened, and the blocking mechanism is arranged at the end of the second pipe body 2, so that the two ends of the second pipe body 2 are connected with the first pipe body 1 through the blocking mechanism.

[0124] At one end of the second pipe body 2, the first fluid medium is continuously input into the second pipe body 2 through the connecting head 409, and the temperature of the first fluid medium is 80-120°C. The high-temperature first fluid medium circulates in the second pipe body 2, so that the cross section of the second pipe body 2 changes from the folded state to the expanded state, and the pipe wall of the second pipe body 2 gradually changes from the flexible state to the solidified state. In this process, the pipe wall of the third pipe body 6 is cracked by the second pipe body 2, and the outer wall of the second pipe body 2 is attached to the inner wall of the well hole 100. After that, the second fluid medium is input into the first pipe body 1, so that the expansion body 3 changes from the first state to the second state. When the expansion body 3 is in the second state, the volume can reach the preset inner wall size of the well hole 100, or the volume can be reduced according to the collapse of the well wall to perform well wall trimming.

[0125] When the cross section of the second pipe body 2 is in the expanded state and the pipe wall of the second pipe body 2 is still flexible (before the pipe wall of the second pipe body 2 is solidified), the first pipe body 1 and the expansion body 3 are moved along the extension direction of the well hole 100 by the coil holder 7. During the movement, the expansion body 3 can monitor the collapsed position (the jammed position) of the inner wall of the well hole 100 by the pressure monitoring device in the second pipe body 2, and then the expansion body 3 is used to modify the collapsed position. Specifically, when the expansion body 3 is jammed, it proves that the inner wall of the well hole 100 is collapsed at this position. At this time, the pressure in the first pipe body 1 is appropriately reduced, the volume of the expansion body 3 is reduced, the expansion body 3 enters the jammed position, and then the volume of the expansion body 3 is increased to open the jammed position and improve the passability of the pipeline, so as to complete the modification of the jammed position. During the above process, the lubricating medium is continuously input into the medium groove 401 to ensure the flexible movement of the first pipe body 1. The expansion body 3 is pulled along the extension direction of the second pipe body 2 for multiple times to further shape the well hole 100 and keep the internal passage smooth and the cross section regular.

[0126] When the pipe wall of the second pipe body 2 is in the solidified state, the pipe wall of the second pipe body 2 is hardened and reaches a certain strength, and then the second pipe body 2 reinforces the inner wall of the well hole 100. The pressure in the second pipe body 2 is released, that is, the first fluid medium in the second pipe body 2 is released, and then the first pipe body 1 is removed from the second pipe body 2.

[0127] After that, the pipeline back dragging and other construction operations can be carried out. During the pipeline back dragging, the outer wall of the pipeline is in contact with the inner wall of the second pipe body 2 made of PE, and there is also a lubricating medium between the two, which can reduce the frictional resistance between the outer wall of the pipeline and the inner wall of the second pipe body 2, so that the pipeline back dragging construction can be carried out smoothly.

[0128] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the description.

[0129] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A reinforcement device, characterized in that, The reinforcing device is used for modifying the cross-sectional shape of a well hole (100) and reinforcing the inner wall of the well hole (100) in pipeline crossing construction. A first pipe body (1) is used for crossing the well hole (100); A second pipe body (2) is sleeved outside the first pipe body (1), the cross section of the second pipe body (2) perpendicular to the extending direction has a folded state and an expanded state, the pipe wall of the second pipe body (2) has a flexible state and a solidified state, and the pipe wall of the second pipe body (2) gradually changes from the flexible state to the solidified state after the cross section of the second pipe body (2) is in the expanded state; At least one expansion body (3) is arranged on the part of the first pipe body (1) placed in the well hole (100) and is in communication with the first pipe body (1), the expansion body (3) has a first state and a second state, the volume of the expansion body (3) in the second state is greater than the volume of the expansion body (3) in the first state, and the volume of the expansion body (3) in the second state is adjustable, and the volume of the expansion body (3) can be increased or decreased according to the cross-sectional deformation of the well hole (100); When the cross section of the second pipe body (2) is in the expanded state and the pipe wall of the second pipe body (2) is in the flexible state, the second pipe body (2) is attached to the inner wall of the well hole (100), the expansion body (3) is controllably changed from the first state to the second state, the first pipe body (1) is controllably reciprocated along the extending direction of the well hole (100), the outer wall of the expansion body (3) can prop open the jammed position of the inner wall of the well hole (100) to make the expansion body (3) modify the cross-sectional shape of the well hole (100), and when the cross section of the second pipe body (2) is in the expanded state and the pipe wall of the second pipe body (2) is in the solidified state, the second pipe body (2) is used for reinforcing the inner wall of the well hole (100); The reinforcing device further comprises a third pipe body (6), when the second pipe body (2) is in the folded state, the third pipe body (6) is sleeved outside the second pipe body (2), and when the second pipe body (2) is in the expanded state, the pipe wall of the third pipe body (6) is expanded and ruptured to form a net structure; Further comprising a blocking mechanism, the end of the second pipe body (2) is connected with the first pipe body (1) through the blocking mechanism; the blocking mechanism comprises a body part (4), the body part (4) is sleeved on the outer wall of the first pipe body (1), and the first pipe body (1) can move relative to the body part (4) along the axial direction of the body part (4); The first pipe body (1) is used for inputting a second fluid medium to make the expansion body (3) change from the first state to the second state.

2. The reinforcement device of claim 1, wherein One end of the body part (4) towards the second pipe body (2) is placed inside the second pipe body (2), and the body part (4) sealingly connects the first pipe body (1) and the second pipe body (2).

3. The reinforcement device of claim 2, wherein, The inner wall of the part of the body part (4) placed at least in the second pipe body (2) has a fluid passing space (5) between the outer wall of the first pipe body (1), the first fluid medium is input into the fluid passing space (5) through the body part (4) to gradually change the cross section of the second pipe body (2) from the folded state to the expanded state; or at one end of the second pipe body (2), the first fluid medium is continuously input into the fluid passing space (5) through the body part (4), the temperature of the first fluid medium is 80-120℃, at the other end of the second pipe body (2), the first fluid medium flowing through the second pipe body (2) is continuously discharged from the other body part (4) through the other fluid passing space (5) to gradually change the cross section of the second pipe body (2) from the folded state to the expanded state and gradually change the pipe wall of the second pipe body (2) from the flexible state to the solidified state.

4. The reinforcement device of claim 3, wherein The density of the second fluid medium is greater than the density of the first fluid medium.

5. The reinforcement device of claim 2, wherein, The inner wall of the part of the body part (4) matched with the first pipe body (1) is provided with a medium groove (401) for setting a lubricating medium.

6. The reinforcement device of claim 5, wherein, The medium groove (401) is spirally arranged around the axis of the body part (4), one end of the medium groove (401) is a lubricating medium inlet (407), and the other end is a lubricating medium outlet (408); when the first pipe body (1) moves along the axis of the body part (4) relative to the body part (4), the lubricating medium inlet (407) continuously injects the lubricating medium, the lubricating medium flows through the medium groove (401) and then is output from the lubricating medium outlet (408).

7. The reinforcement device of claim 1, wherein The pipe wall of the second pipe body (2) includes a first pipe wall layer (201), a second pipe wall layer (202) and a third pipe wall layer (203) arranged in turn from inside to outside in the radial direction, the first pipe wall layer (201) is used for sealing the second pipe body (2), the second pipe wall layer (202) is used for setting a mixture of cement and fine sand or a thermosetting resin, and the outer wall of the third pipe wall layer (203) is used for setting a lubricating medium.

8. The reinforcement device of claim 1, wherein, The outer wall of the third pipe body (6) is provided with a plurality of groove groups, the grooves (601) in the same group are arranged at intervals along the axis of the third pipe body (6), and the grooves (601) in adjacent groups are arranged at intervals and staggered in the circumferential direction of the third pipe body (6).

9. A construction method, characterized by, The construction method is performed by the reinforcing device of any one of claims 1-8, and the construction method comprises: The first pipe body (1) and the second pipe body (2) forming a whole are inserted into the well hole (100), at this time the cross section of the second pipe body (2) is in a folded state and the pipe wall is in a flexible state; The first fluid medium is input into the second pipe body (2) to change the cross section of the second pipe body (2) from the folded state to the expanded state, and the second fluid medium is input into the first pipe body (1) to change the expanded body (3) from the first state to the second state; When the pipe wall of the second pipe body (2) is in a flexible state, the first pipe body (1) is moved along the extension direction of the well hole (100), and the expansion body (3) trims the cross-sectional shape of the well hole (100); When the pipe wall of the second pipe body (2) is in a solidified state, the second pipe body (2) reinforces the inner wall of the well hole (100).

10. The construction method according to claim 9, characterized in that, The second pipe wall layer (202) of the second pipe body (2) is provided with a mixture of cement and fine sand, and before the step of penetrating the first pipe body (1) and the second pipe body (2) to be formed into a whole into the well hole (100) when the cross section of the second pipe body (2) is in a folded state and the pipe wall is in a flexible state, the second pipe wall layer (202) is also sprayed.

11. The construction method according to claim 9, characterized in that, The second pipe wall layer (202) of the second pipe body (2) is provided with a thermosetting resin, and the steps of inputting a first fluid medium into the second pipe body (2) to change the cross section of the second pipe body (2) from a folded state to an expanded state, and inputting a second fluid medium into the first pipe body (1) to change the expansion body (3) from a first state to a second state, including: continuously inputting the first fluid medium into one end of the second pipe body (2), the temperature of the first fluid medium is 80-120℃, and the first fluid medium flowing through the second pipe body (2) is continuously output from the other end of the second pipe body (2), so that the cross section of the second pipe body (2) gradually changes from the folded state to the expanded state, and the pipe wall of the second pipe body (2) gradually changes from the flexible state to the solidified state.

12. The construction method according to any one of claims 9-11, characterized in that, The step of moving the first pipe body (1) along the extension direction of the well hole (100) when the pipe wall of the second pipe body (2) is in a flexible state, and the expansion body (3) trims the cross-sectional shape of the well hole (100), including: the volume of the expansion body (3) matches the preset inner diameter size of the well hole (100), during the movement of the first pipe body (1) along the extension direction of the well hole (100), when the expansion body (3) is blocked, the volume of the expansion body (3) is reduced, the expansion body (3) enters the blocked position and the volume of the expansion body (3) is increased, so as to open and trim the blocked position.

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