A horizontal wellbore reconstruction and completion device

Abstract

The present invention discloses a completion device for horizontal wellbore reconstruction, which includes a completion combined casing, a sand control pipe assembly, a pneumatic sand removal structure, and an external drive pipe fitting. A gravel filling layer and a secondary sand filtration layer are formed on the side of the sand control pipe assembly close to the oil layer. Both the gravel filling layer and the secondary sand filtration layer are used to filter sand and gravel and allow the oil body to enter the interior of the sand control pipe assembly; the pneumatic sand removal structure is used to perform a jacking action on the sand and gravel initially entering the secondary sand filtration layer, so that the sand and gravel enter the gravel filling layer from the secondary sand filtration layer. The present invention forms a uniform sand control barrier between the gravel filling layer and the secondary sand filtration layer, improves the sand control accuracy, and performs a jacking action on the sand and gravel initially entering the secondary sand filtration layer through the pneumatic sand removal structure, so that the sand and gravel enter the gravel filling layer from the secondary sand filtration layer, processes the small amount of sand and gravel entering the secondary sand filtration layer, discharges the sand and gravel before the sand control fails, effectively extends the sand control time, and realizes sand control and initial sand removal.

Description

Technical Field

[0001] The present invention relates to a completion device for horizontal wells, and more particularly to a completion device for reconstructing the wellbore of horizontal wells. Background Art

[0002] Sand production in oil and gas wells is a difficult problem that needs to be solved urgently in the process of oil exploitation. If the sand damage is not treated, it may damage the casing and lead to the abandonment of the oil well. At present, mechanical sand control pipes and gravel packing sand control are sand control methods with better sand control effects. Among them, the mechanical sand control pipe adopts the method of setting slits on the pipe body to filter sand and gravel; gravel packing sand control is to install sand control pipes in the entire oil layer of the horizontal well section and perform external packing of the pipes.

[0003] Among them, the structure of the mechanical sand control pipe needs to control the sand retention accuracy (slit size) within a certain range to effectively prevent sand production from the formation. One layer of sand control screen pipe can meet the sand control requirements. However, the particle size of formation sand is extremely small, and high-precision sand control requires the slit size to be less than a certain value, which will hinder the flow of formation fluids and reduce the productivity of the oil well; the gravel packing sand control method has high precision, but after gravel packing, a uniform sand retention barrier cannot be formed, resulting in small-particle sand and gravel in some areas entering the sand control pipe. Prolonged use causes the method to fail, and it is difficult to deal with after sand control failure.

[0004] Therefore, the existing technology has the following technical problems and cannot meet the conditions of high sand control accuracy, uniform sand control barrier, and easy treatment after sand control failure at the same time. Summary of the Invention

[0005] For this reason, the present invention provides a completion device for reconstructing the wellbore of horizontal wells, which effectively solves the problem that the existing technology cannot meet the conditions of high sand control accuracy, uniform sand control barrier, and easy treatment after sand control failure at the same time.

[0006] To solve the above technical problems, the present invention specifically provides the following technical solutions: A completion device for reconstructing the wellbore of horizontal wells, comprising:

[0007] A completion combined casing, fixedly installed in the horizontal well section of the open-hole wellbore;

[0008] A sand control pipe assembly, fixedly connected to the end of the completion combined casing. A gravel filling layer and a secondary sand filtration layer are formed on the side of the sand control pipe assembly close to the oil layer. Both the gravel filling layer and the secondary sand filtration layer are used for filtering sand and gravel and allowing the oil body to enter the interior of the sand control pipe assembly;

[0009] A pneumatic sand removal structure, arranged on the sand control pipe assembly, and the pneumatic sand removal structure is used to perform a jacking action on the sand and gravel initially entering the secondary sand filtration layer, so that the sand and gravel enter the gravel filling layer from the secondary sand filtration layer;

[0010] An externally driven pipe fitting is arranged on the pneumatic sand removal structure and between the completion combined casing and the sand control pipe assembly. The externally driven pipe fitting is used to provide a driving force for the pneumatic sand removal structure to eject the sand and gravel initially entering the secondary sand filtration layer.

[0011] Further, the sand control pipe assembly includes a first layered sealing cylinder fixedly connected to the end of the completion combined casing, a first sieve pipe fixedly connected to the end of the first layered sealing cylinder, a second layered sealing cylinder fixedly connected to the end of the first sieve pipe, a first horizontal casing fixedly connected to the end of the second layered sealing cylinder, a third layered sealing cylinder fixedly connected to the first horizontal casing, and a second sieve pipe fixedly connected to the end of the third layered sealing cylinder;

[0012] An external packer is arranged outside the first horizontal casing, and a guide head is arranged at the front end of the second sieve pipe;

[0013] At least one second sieve pipe is provided, and the first horizontal casing, the second layered sealing cylinder and the third layered sealing cylinder are arranged between adjacent second sieve pipes.

[0014] Further, outer sieve pipes are arranged on both the first sieve pipe and the second sieve pipe. The outer sieve pipes are provided with at least two, and adjacent outer sieve pipes are sleeved with each other, and are welded between the ends of adjacent outer sieve pipes;

[0015] An outer long and narrow slit is arranged on the outer wall of the outer sieve pipe, an inner long and narrow slit is arranged on the inner wall of the outer sieve pipe, and an arc-shaped flow space is arranged in the outer sieve pipe wall body. The outer long and narrow slit is communicated with the inner long and narrow slit through the arc-shaped flow space;

[0016] The lengths of the outer long and narrow slit, the inner long and narrow slit and the arc-shaped flow space are the same, and one outer long and narrow slit corresponds to two inner long and narrow slits.

[0017] Further, the inner long and narrow slit in the outer sieve pipe located outside corresponds to and communicates with the outer long and narrow slit of the outer sieve pipe located inside;

[0018] Circulation gaps are arranged on both the first sieve pipe and the second sieve pipe, and the circulation gaps correspond to and communicate with the inner long and narrow slits of the outermost inner sieve pipe.

[0019] Further, an outer sand removal cylinder is sleeved outside the outer sieve pipe. The end of the outer sand removal cylinder is welded to the outer sieve pipe. A circulation cavity is formed between the outer sand removal cylinder and the outer sieve pipe, and a conical hole is arranged on the wall body of the outer sand removal cylinder;

[0020] The conical hole communicates with the circulation chamber, and the width of the mouth of the conical hole away from the circulation chamber is smaller than the width of the mouth of the conical hole close to the circulation chamber.

[0021] Further, the gravel filling layer is filled outside the sand removal outer cylinder;

[0022] A filter sand wall body is fixedly arranged on the outer wall of the sand removal outer cylinder corresponding to the position of the conical hole, and a sand removal space is formed between the filter sand wall body and the outer wall of the sand removal outer cylinder.

[0023] Further, the pneumatic sand removal structure includes a connecting shaft penetrating through the sand removal outer cylinder, a pipe groove seat installed in the circulation chamber, a fixed seat fixedly arranged on the pipe groove seat, and a shifting seat arranged on the connecting shaft;

[0024] The connecting shaft movably penetrates through the pipe groove seat, the shifting seat is slidably arranged on the pipe groove seat, a first rotating sand removal bolt is rotatably arranged on the fixed seat, a second rotating sand removal bolt is rotatably arranged on the shifting seat, and the ends of the first rotating sand removal bolt and the second rotating sand removal bolt are rotatably connected.

[0025] Further, a movable valve plate is connected to the opening of the conical hole, a filter opening is formed between the movable valve plates, and the first rotating sand removal bolt and the second rotating sand removal bolt can pass through the filter opening.

[0026] Further, the completion combined casing includes a completion string, an inclined casing arranged on the completion string, and a second horizontal casing arranged at the end of the inclined casing;

[0027] A stage collar is arranged on the inclined casing, and a tubing is arranged in the completion string, the inclined casing and the second horizontal casing.

[0028] Further, the external drive pipe fitting includes a pushing cylinder sleeved outside the tubing, an impactor arranged on the pushing cylinder, an impact pipe arranged on the impactor, and a pneumatic source arranged at the end of the impact pipe;

[0029] The pushing cylinder is movably arranged outside the tubing, the outer end of the connecting shaft is connected with a pushing shaft, and the pushing cylinder is docked with the outer end of the pushing shaft;

[0030] An impact hole is formed in the impactor, the impact hole faces the inclined casing side, and the impact hole communicates with the inside of the impactor.

[0031] The present invention has the following beneficial effects compared with the prior art:

[0032] The present invention provides a sand control pipe assembly, which forms a gravel packing layer and a secondary sand filtration layer, improving the sand control accuracy. A uniform sand control barrier is formed between the gravel packing layer and the secondary sand filtration layer. An air-driven sand removal structure is used to eject the sand and gravel initially entering the secondary sand filtration layer, so that the sand and gravel enter the gravel packing layer from the secondary sand filtration layer, dealing with the small amount of sand and gravel entering the secondary sand filtration layer, discharging the sand and gravel in time before sand control failure, effectively extending the sand control time, and realizing sand control and preliminary sand removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0034] Figure 1 Structural schematic diagram of a horizontal wellbore reconstruction completion device provided by an embodiment of the present invention;

[0035] Figure 2 Cross-sectional structural schematic diagram of the sand control pipe assembly in an embodiment of the present invention;

[0036] Figure 3 Structural schematic diagram of the sand control pipe assembly during sand removal in an embodiment of the present invention;

[0037] Figure 4 Structural schematic diagram of the sand control pipe assembly in the initial state in an embodiment of the present invention;

[0038] Figure 5 For Figure 3 Enlarged structural schematic diagram of A in

[0039] Figure 6 For Figure 4 Enlarged structural schematic diagram of B in

[0040] Figure 7 Structural schematic diagram of the outer drive pipe fitting in an embodiment of the present invention.

[0041] The reference numerals in the drawings are respectively represented as follows:

[0042] 1 - completion combined casing; 2 - sand control pipe assembly; 3 - air-driven sand removal structure; 4 - outer drive pipe fitting; 5 - gravel packing layer;

[0043] 11 - completion string; 12 - inclined casing; 13 - second horizontal casing; 14 - stage collar; 15 - tubing;

[0044] 21 - First stratified sealing cylinder; 22 - First sieve tube; 23 - Second stratified sealing cylinder; 24 - First horizontal casing; 25 - Third stratified sealing cylinder; 26 - Second sieve tube; 27 - Guide head; 28 - Outer sieve tube; 29 - Outer long and narrow slit; 210 - Inner long and narrow slit; 211 - Arc-shaped flow space; 212 - Flow gap; 213 - Sand removal outer cylinder; 214 - Flow cavity; 215 - Tapered hole; 216 - Filter sand wall body; 217 - Sand removal space; 218 - External packer

[0045] 31 - Connecting shaft; 32 - Pipe groove seat; 33 - Fixed seat; 34 - Shifting seat; 35 - First rotating sand removal bolt; 36 - Second rotating sand removal bolt; 37 - Movable valve plate; 38 - Filter port

[0046] 41 - Pushing cylinder; 42 - Impactor; 43 - Impact pipe; 44 - Pneumatic source; 45 - Pushing shaft; 46 - Impact hole Detailed implementation mode

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] As Figure 1 shown, the present invention provides a horizontal wellbore reconstruction and completion device, which includes a completion combined casing 1, a sand control pipe assembly 2, a pneumatic sand removal structure 3, and an external drive pipe fitting 4.

[0049] Among them, the completion combined casing 1 is fixedly installed in the horizontal well section of the open hole wellbore.

[0050] The sand control pipe assembly 2 is fixedly connected to the end of the completion combined casing 1. A gravel filling layer 5 and a secondary filter sand layer are formed on the side of the sand control pipe assembly 2 close to the oil layer. Both the gravel filling layer 5 and the secondary filter sand layer are used to filter sand and allow the oil body to enter the inside of the sand control pipe assembly 2.

[0051] The pneumatic sand removal structure 3 is arranged on the sand control pipe assembly 2 and is used to perform a pushing action on the sand initially entering the secondary filter sand layer, so that the sand enters the gravel filling layer 5 from the secondary filter sand layer.

[0052] The external drive pipe fitting 4 is arranged on the pneumatic sand removal structure 3 and between the completion combined casing 1 and the sand control pipe assembly 2, and is used to provide a driving force for the pneumatic sand removal structure 3 to perform a pushing action on the sand initially entering the secondary filter sand layer.

[0053] In the embodiment of the present invention, a sand control pipe assembly 2 is provided, forming a gravel packing layer 5 and a secondary sand filtration layer, improving the sand control accuracy, forming a uniform sand control barrier between the gravel packing layer 5 and the secondary sand filtration layer, and using a pneumatic sand removal structure 3 to eject the sand and gravel initially entering the secondary sand filtration layer, so that the sand and gravel enter the gravel packing layer 5 from the secondary sand filtration layer, treating the small amount of sand and gravel entering the secondary sand filtration layer, discharging the sand and gravel in time before the sand control fails, effectively prolonging the sand control time, and realizing sand control and preliminary sand removal.

[0054] Among them, a gravel packing layer 5 and a secondary sand filtration layer are formed on the side of the sand control pipe assembly 2 close to the oil layer. Both the gravel packing layer 5 and the secondary sand filtration layer are used to filter sand and gravel and allow the oil body to enter the interior of the sand control pipe assembly 2. The sand control pipe assembly 2 of the present invention adopts the following preferred embodiments, such as Figure 2 and Figure 3 As shown, the sand control pipe assembly 2 includes a first layered sealing cylinder 21 fixedly connected to the end of the completion combined casing 1, a first sieve pipe 22 fixedly connected to the end of the first layered sealing cylinder 21, a second layered sealing cylinder 23 fixedly connected to the end of the first sieve pipe 22, a first horizontal casing 24 fixedly connected to the end of the second layered sealing cylinder 23, a third layered sealing cylinder 25 fixedly connected to the first horizontal casing 24, and a second sieve pipe 26 fixedly connected to the end of the third layered sealing cylinder 25.

[0055] Among them, an external packer 218 is arranged outside the first horizontal casing 24, and a guide head 27 is arranged at the front end of the second sieve pipe 26. The function of the guide head 27 is to guide the casing to smoothly reach the bottom of the well.

[0056] In addition, the second sieve pipe 26 and the first sieve pipe 22 in the above embodiments both correspond to the oil layer underground. At least one second sieve pipe 26 is provided. The number and length of the corresponding second sieve pipes 26 and the length of the first sieve pipe 22 are adjusted according to the position of the oil layer. In order to ensure the sealing of the pipeline between the second sieve pipes 26, a first horizontal casing 24, a second layered sealing cylinder 23 and a third layered sealing cylinder 25 are arranged between adjacent second sieve pipes 26.

[0057] In addition to the first sieve pipe 22 and the second sieve pipe 26 located inside, the secondary sand filtration layer also has the following structure, such as Figure 2 and Figure 3 As shown, outer sieve pipes 28 are arranged on both the first sieve pipe 22 and the second sieve pipe 26. At least two outer sieve pipes 28 are provided, and adjacent outer sieve pipes 28 are sleeved with each other, and the ends of adjacent outer sieve pipes 28 are welded.

[0058] In order to enable the outer sieve pipe 28 to have a corresponding sand filtration effect, the present invention also makes the following design, such as Figure 2As shown, the outer wall of the outer shell screen tube 28 is provided with an outer narrow slit 29, the inner wall of the outer shell screen tube 28 is provided with an inner narrow slit 210, and the wall of the outer shell screen tube 28 is provided with an arc-shaped flow space 211, and the outer narrow slit 29 is connected with the inner narrow slit 210 through the arc-shaped flow space 211; the lengths of the outer narrow slit 29, the inner narrow slit 210 and the arc-shaped flow space 211 are consistent, and one outer narrow slit 29 corresponds to two inner narrow slits 210.

[0059] The inner narrow and long slits 210 in the outer casing screen tube 28 located outside are correspondingly communicated with the outer narrow and long slits 29 in the inner casing screen tube 28 located inside.

[0060] Taking the existence of two outer jacket screens 28 as an example, the oil body enters the arcuate flow space 211 from the outer narrow slit 29 of the outer jacket screen 28, then enters the inner narrow slit 210, enters the corresponding arcuate flow space 211 through the outer narrow slit 29 of the inner jacket screen 28, then enters the inner narrow slit 210, and finally enters the first sub-screen 22 or the second sub-screen 26.

[0061] In order to allow oil to flow in, a flow gap 212 is provided on the first sub-screen tube 22 and the second sub-screen tube 26. The flow gap 212 is correspondingly connected to the inner narrow slit 210 of the outer shell screen tube 28 located on the innermost side. The oil enters the flow gap 212 from the inner narrow slit 210 and then enters the first sub-screen tube 22 or the second sub-screen tube 26.

[0062] In order to achieve sand prevention and sand removal, the secondary sand filter layer also has an outermost sand removal outer cylinder 213. The specific structure is as follows: the outer shell of the outer screen tube 28 is provided with a sand removal outer cylinder 213, the end of the sand removal outer cylinder 213 is welded to the outer shell screen tube 28, a flow cavity 214 is formed between the sand removal outer cylinder 213 and the outer shell screen tube 28, and a conical hole 215 is provided on the wall of the sand removal outer cylinder 213; the conical hole 215 is connected with the flow cavity 214, and the width of the mouth of the conical hole 215 away from the flow cavity 214 is smaller than the width of the mouth of the conical hole 215 close to the flow cavity 214.

[0063] In the above embodiment, the fluid enters the conical hole 215 from the gravel packing layer 5 and directly enters the flow chamber 214 , and then enters the outer narrow slot 29 of the outer jacket screen 28 .

[0064] The design of the tapered hole 215 being narrow at the top and wide at the bottom is to prevent sand and gravel from entering as much as possible. However, some sand and gravel still enter the tapered hole 215.

[0065] The gravel filling layer 5 provided in the present invention greatly reduces the situation of sand and gravel entering. The gravel filling layer 5 is filled outside the sand removal outer cylinder 213. However, due to the relatively difficult filling of the gravel filling layer 5, in the actual situation where there is no corresponding gravel filling layer 5, it is also possible to stop and process the entering sand and gravel to a certain extent.

[0066] As Figure 3 and Figure 4 shown, between the gravel filling layer 5 and the sand removal outer cylinder 213, a filter sand wall body 216 is fixedly arranged on the outer wall of the sand removal outer cylinder 213 corresponding to the position of the conical hole 215. An air sand removal space 217 is formed between the filter sand wall body 216 and the outer wall of the sand removal outer cylinder 213.

[0067] The filter sand wall body 216 in the above embodiment can be seen as a filter sand net steel part to filter the sand and gravel. In addition, the sand removal process is mainly carried out in the air sand removal space 217.

[0068] The pneumatic sand removal structure 3 is used to perform a jacking action on the sand and gravel initially entering the secondary filter sand layer, so that the sand and gravel enter the gravel filling layer 5 from the secondary filter sand layer. The pneumatic sand removal structure 3 of the present invention adopts the following preferred embodiments. As Figure 5 and Figure 6 shown, the pneumatic sand removal structure 3 includes a connecting shaft 31 penetrating through the sand removal outer cylinder 213, a pipe groove seat 32 installed in the circulation cavity 214, a fixed seat 33 fixedly arranged on the pipe groove seat 32, and a displacement seat 34 arranged on the connecting shaft 31; the connecting shaft 31 movably penetrates through the pipe groove seat 32, the displacement seat 34 is slidably arranged on the pipe groove seat 32, a first rotating sand removal bolt 35 is rotatably arranged on the fixed seat 33, a second rotating sand removal bolt 36 is rotatably arranged on the displacement seat 34, and the ends of the first rotating sand removal bolt 35 and the second rotating sand removal bolt 36 are rotatably connected.

[0069] In the above embodiment, the first rotating sand removal bolt 35 and the second rotating sand removal bolt 36 can rotate to jack out the sand and gravel. Therefore, the rotation actions of the first rotating sand removal bolt 35 and the second rotating sand removal bolt 36 determine the progress of the sand removal work. In this embodiment, the translation of the connecting shaft 31 can drive the rotation of the first rotating sand removal bolt 35 and the second rotating sand removal bolt 36. The translation of the connecting shaft 31 drives the displacement seat 34 to slide in the pipe groove seat 32, and the movement of the displacement seat 34 drives the first rotating sand removal bolt 35 to rotate, thereby driving the second rotating sand removal bolt 36 to also rotate, so as to jack out the sand and gravel (as Figure 5 shown).

[0070] In order to smoothly remove the sand and gravel during the jacking and retracting process, the present invention also makes the following design. The opening part of the conical hole 215 is connected with a movable valve piece 37, a filter port 38 is formed between the movable valve pieces 37, and the first rotating sand removal bolt 35 and the second rotating sand removal bolt 36 can pass through the filter port 38.

[0071] In the above embodiment, both liquid and sand and gravel can enter the conical hole 215 through the filter port 38. Some of the sand and gravel enter the conical hole 215 and fall into the rotating connection between the first rotating sand removal plug 35 and the second rotating sand removal plug 36. The rotating action of the first rotating sand removal plug 35 and the second rotating sand removal plug 36 can drive the rotating connection to move upward and pass through the movable valve plate 37 to enter the sand removal space 217. During the upward movement, the movable valve plate 37 gradually abuts against the first rotating sand removal plug 35 and the second rotating sand removal plug 36. During the return of the first rotating sand removal plug 35 and the second rotating sand removal plug 36, the movable valve plate 37 scrapes off the sand and gravel on the first rotating sand removal plug 35 and the second rotating sand removal plug 36, so that the sand and gravel remain in the sand removal space 217.

[0072] like Figure 1 As shown, the completion combination casing 1 of the present invention includes a completion string 11, an inclined casing 12 arranged on the completion string 11, and a second horizontal casing 13 arranged at the end of the inclined casing 12; a grading hoop 14 is arranged on the inclined casing 12, and an oil pipe 15 is arranged in the completion string 11, the inclined casing 12 and the second horizontal casing 13, wherein the oil pipe 15 is used to extract liquid in the pipeline, and in addition, a corresponding external pipe packer 218 needs to be arranged on the inclined casing 12.

[0073] The present invention provides driving force to the connecting shaft 31 through the external driving pipe 4. The external driving pipe 4 of the present invention adopts the following preferred embodiments, such as Figure 7 As shown, the external driving pipe fitting 4 includes a pushing cylinder 41 sleeved on the outside of the oil pipe 15, an impactor 42 arranged on the pushing cylinder 41, an impact pipe 43 arranged on the impactor 42, and a pneumatic source 44 arranged at the end of the impact pipe 43; the pushing cylinder 41 is movably arranged outside the oil pipe 15, the outer end of the connecting shaft 31 is connected to the pushing shaft 45, and the pushing cylinder 41 is connected to the outer end of the pushing shaft 45; an impact hole 46 is opened on the impactor 42, the impact hole 46 is opposite to one side of the inclined sleeve 12, and the impact hole 46 is connected to the inside of the impactor 42.

[0074] In the above embodiment, the pneumatic source 44 drives the gas to enter the impactor 42 through the impact pipe 43, and rushes to the side of the inclined sleeve 12 through the impact hole 46. Under the action of pneumatic force, the impactor 42 drives the push tube 41 to move away from the inclined sleeve 12, pushing the connecting shaft 31, thereby providing a driving force for the connecting shaft 31 in the tube.

[0075] In summary, the main implementation process of the present invention is:

[0076] Lower the completion combined casing 1 and the sand control pipe assembly 2 into the open-hole wellbore so that the first sieve tube 22 and the second sieve tube 26 correspond to the oil layer. Then set the external packer 218 and fill the gravel packing layer 5 corresponding to the positions of the first sieve tube 22 and the second sieve tube 26. During this period, cement needs to be injected in stages for well cementing;

[0077] Lower the tubing 15 into the completion combined casing 1 and the sand control pipe assembly 2. Liquid enters the gravel packing layer 5 from the oil layer. The fluid enters the conical hole 215 from the gravel packing layer 5 and directly enters the flow cavity 214, and then enters the outer narrow slit 29 of the outer casing sieve tube 28 outside. The oil body enters the arc-shaped flow space 211 from the outer narrow slit 29 of the outer casing sieve tube 28 outside, and then enters the inner narrow slit 210. It enters the corresponding arc-shaped flow space 211 through the outer narrow slit 29 of the inner casing sieve tube 28, and then enters the inner narrow slit 210. Finally, it enters the first sieve tube 22 or the second sieve tube 26 and is discharged through the tubing 15;

[0078] Perform sand removal work periodically: Driven by the pneumatic source 44, the gas enters the impactor 42 through the impact pipeline 43 and rushes towards one side of the inclined casing 12 under the action of the impact hole 46. Under the pneumatic action, the impactor 42 drives the push cylinder 41 to move away from the inclined casing 12, pushes the connecting shaft 31, drives the first rotating sand removal bolt 35 and the second rotating sand removal bolt 36 to rotate. The rotation connection part of the first rotating sand removal bolt 35 and the second rotating sand removal bolt 36 moves upward, passes through the movable valve plate 37 and enters the sand removal space 217. During the upward movement, the movable valve plate 37 gradually abuts against the first rotating sand removal bolt 35 and the second rotating sand removal bolt 36. During the return process of the first rotating sand removal bolt 35 and the second rotating sand removal bolt 36, the movable valve plate 37 scrapes the sand and gravel on the first rotating sand removal bolt 35 and the second rotating sand removal bolt 36, so that the sand and gravel remain in the sand removal space 217.

[0079] In the case of repeated fracturing and easy failure of the later seal during the long-term use of horizontal wells, for this situation, the horizontal wellbore reconstruction technology provides favorable technical support for the repeated fracturing and water plugging work of horizontal wells. The procedures of horizontal wellbore reconstruction are as follows: oil displacement, pulling out the production string (completion combined casing 1, sand control pipe assembly 2), wellbore treatment, scraping, casing pressure test, energy supplement before fracturing, leakage reduction construction, wellbore cleaning, wellbore reconstruction, pressure test, measuring three items, tubing-conveyed fire perforation for the first stage, open-hole casing fracturing for the first stage, lowering the hydraulic pumping bridge plug tool; setting, perforating, open-hole casing fracturing for the second stage,... (the same as the above steps), the last stage of repeated fracturing construction, shutting in the well, flowing back, running in the drill string to grind the sand washing tool, sand washing, replacing the swabbing drill string, swabbing and discharging liquid, running in the pump to complete the well and resume production.

[0080] In the above embodiments, there are five sand control parts in the sand control section, which are, in sequence: gravel packing layer 5, sand filtering wall body 216, tapered hole 215, outer casing screen pipe 28, and first split screen pipe 22 (second split screen pipe 26).

[0081] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present application.

Claims

1. A horizontal wellbore reconstruction and completion device, characterized in that Comprising: A completion combined casing (1) fixedly installed in the horizontal well section of an open-hole wellbore; A sand control pipe assembly (2) fixedly connected to the end of the completion combined casing (1). A gravel filling layer (5) and a secondary sand filtering layer are formed on the side of the sand control pipe assembly (2) close to the oil layer. Both the gravel filling layer (5) and the secondary sand filtering layer are used for filtering sand and allowing the oil body to enter the interior of the sand control pipe assembly (2); A pneumatic sand removal structure (3) arranged on the sand control pipe assembly (2). The pneumatic sand removal structure (3) is used to eject the sand initially entering the secondary sand filtering layer so that the sand enters the gravel filling layer (5) from the secondary sand filtering layer; An external drive pipe fitting (4) arranged on the pneumatic sand removal structure (3) and between the completion combined casing (1) and the sand control pipe assembly (2). The external drive pipe fitting (4) is used to provide a driving force for the pneumatic sand removal structure (3) to eject the sand initially entering the secondary sand filtering layer; The sand control pipe assembly (2) includes a first layered sealing cylinder (21) fixedly connected to the end of the completion combined casing (1), a first sieve pipe (22) fixedly connected to the end of the first layered sealing cylinder (21), a second layered sealing cylinder (23) fixedly connected to the end of the first sieve pipe (22), a first horizontal casing (24) fixedly connected to the end of the second layered sealing cylinder (23), a third layered sealing cylinder (25) fixedly connected to the first horizontal casing (24), and a second sieve pipe (26) fixedly connected to the end of the third layered sealing cylinder (25); Outer sieve pipes (28) are arranged on both the first sieve pipe (22) and the second sieve pipe (26); An outer sand removal cylinder (213) is sleeved outside the outer sieve pipe (28). The end of the outer sand removal cylinder (213) is welded to the outer sieve pipe (28), and a flow cavity (214) is formed between the outer sand removal cylinder (213) and the outer sieve pipe (28); The pneumatic sand removal structure (3) includes a connecting shaft (31) penetrating through the outer sand removal cylinder (213), a pipe groove seat (32) installed in the flow cavity (214), a fixed seat (33) fixedly arranged on the pipe groove seat (32), and a displacement seat (34) arranged on the connecting shaft (31); The connecting shaft (31) movably penetrates through the pipe groove seat (32), the displacement seat (34) is slidably arranged on the pipe groove seat (32), a first rotating sand removal bolt (35) is rotatably arranged on the fixed seat (33), a second rotating sand removal bolt (36) is rotatably arranged on the displacement seat (34), and the ends of the first rotating sand removal bolt (35) and the second rotating sand removal bolt (36) are rotatably connected; 2. The completion device for reconstructing a horizontal wellbore according to claim 1, wherein An external pipe packer (218) is arranged outside the first horizontal casing (24), and a guiding head (27) is arranged at the front end of the second sieve pipe (26); At least one of the second screening pipes (26) is provided, and the first horizontal casing (24), the second layered sealing cylinder (23) and the third layered sealing cylinder (25) are arranged between adjacent second screening pipes (26).

3. The horizontal wellbore reconstruction and completion device according to claim 2, wherein, At least two outer casing pipes (28) are provided, and adjacent outer casing pipes (28) are sleeved with each other, and are welded between the ends of adjacent outer casing pipes (28); An outer long and narrow slit (29) is arranged on the outer wall of the outer casing pipe (28), an inner long and narrow slit (210) is arranged on the inner wall of the outer casing pipe (28), an arc-shaped flow space (211) is arranged in the wall body of the outer casing pipe (28), and the outer long and narrow slit (29) is communicated with the inner long and narrow slit (210) through the arc-shaped flow space (211); The lengths of the outer long and narrow slit (29), the inner long and narrow slit (210) and the arc-shaped flow space (211) are the same, and one outer long and narrow slit (29) corresponds to two inner long and narrow slits (210).

4. The horizontal wellbore reconstruction and completion device according to claim 3, characterized in that, The inner long and narrow slit (210) in the outer casing pipe (28) located outside corresponds to and communicates with the outer long and narrow slit (29) of the outer casing pipe (28) located inside; Flow gaps (212) are arranged on both the first screening pipe (22) and the second screening pipe (26), and the flow gaps (212) correspond to and communicate with the inner long and narrow slit (210) of the innermost outer casing pipe (28).

5. The horizontal wellbore reconstruction and completion device according to claim 4, characterized in that, A conical hole (215) is arranged on the wall body of the sand removal outer cylinder (213); The conical hole (215) communicates with the flow cavity (214), and the width of the mouth of the conical hole (215) far from the flow cavity (214) is smaller than the width of the mouth of the conical hole (215) close to the flow cavity (214).

6. The horizontal wellbore reconstruction and completion device according to claim 5, wherein, The gravel filling layer (5) is filled outside the sand removal outer cylinder (213); A filter sand wall body (216) is fixedly arranged on the outer wall of the sand removal outer cylinder (213) corresponding to the position of the conical hole (215), and a sand removal space (217) is formed between the filter sand wall body (216) and the outer wall of the sand removal outer cylinder (213).

7. The horizontal wellbore reconstruction completion device according to claim 6, characterized in that, A movable valve plate (37) is connected to the opening of the conical hole (215), a filter port (38) is formed between the movable valve plates (37), and the first rotating sand removal bolt (35) and the second rotating sand removal bolt (36) can pass through the filter port (38).

8. The horizontal wellbore reconstruction and completion device according to claim 7, characterized in that, The completion combined casing (1) includes a completion string (11), an inclined casing (12) arranged on the completion string (11), and a second horizontal casing (13) arranged at the end of the inclined casing (12); A stage collar (14) is arranged on the inclined casing (12), and a tubing (15) is arranged in the completion string (11), the inclined casing (12) and the second horizontal casing (13).

9. The horizontal wellbore reconstruction and completion device according to claim 8, characterized in that, The external drive pipe fitting (4) includes a pushing cylinder (41) sleeved outside the oil pipe (15), a shocker (42) arranged on the pushing cylinder (41), a shock pipeline (43) arranged on the shocker (42), and a pneumatic source (44) arranged at the end of the shock pipeline (43); The pushing cylinder (41) is movably arranged outside the oil pipe (15), the outer end of the connecting shaft (31) is connected with a pushing shaft (45), and the pushing cylinder (41) is butted against the outer end of the pushing shaft (45); The shocker (42) is provided with a shock hole (46) which faces one side of the inclined casing (12), and the shock hole (46) is communicated with the inside of the shocker (42).

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