A drum storage tube type reservoir communication device and use method thereof

Abstract

The present application relates to the field of downhole oil tools, and in particular to a drum storage pipe type reservoir communication device and a method for using the same, which includes a drum type coil assembly, including a core shaft, a coil tube connected to the core shaft, a nozzle wound on the coil tube, a stopper and a plug, the stopper is arranged on the core shaft and limits the rotation of the coil tube, the plug is arranged on the core shaft and limits the stopper from falling off the core shaft, the coil tube is provided with a guide hole, one end of the nozzle is located in the guide hole and a nozzle is formed at the end, and the diameter of the nozzle is smaller than the diameter of the guide hole; a sliding sleeve includes an outer tube, an inner tube and a shear pin, the shear pin is arranged on the outer tube and is used to limit the sliding of the inner tube, the core shaft is connected to the inner tube, a transition hole connected to the transition hole is arranged on the inner tube, a spray hole is arranged on the outer tube, and the inner tube can make the transition hole and the spray hole connected or disconnected by sliding. The present application has the effect of maximizing the nozzle length that can be installed with the same axial installation size.

Description

Technical Field

[0001] The present application relates to the field of downhole petroleum tools, and in particular to a drum storage tube type reservoir communication device and a method for using the same. Background Art

[0002] Carbonate reservoirs have complex geological conditions, strong heterogeneity, and extremely special reservoir types. Their reservoir space types are relatively complete, mainly composed of paleokarst cave systems, natural fracture zones, and dissolution pore systems. At the same time, different reservoir space types are intertwined with each other in different combinations to form fracture-cavity reservoirs. In summary, the development characteristics of fracture-cavity reservoirs are summarized as complex reservoir morphology, different sizes, discontinuous distribution, and unclear development rules and controlled factors.

[0003] The effective communication area between the wellbore and the reservoir (oil / gas leakage area) of an oil and gas well is an important aspect that determines the production of oil and gas wells. At present, the acid fracturing technology is mainly used for the development of deep and ultra-deep carbonate oil and gas reservoirs: acid is injected into the formation at an injection pressure higher than the formation fracture pressure. The acid reacts with the walls of natural and artificial fractures in the rock to form uneven grooves. After the acid fracturing construction is completed, the fractures are closed, and the uneven grooves formed by acid fracturing act as channels for the flow of oil and gas, reducing flow resistance and increasing the production capacity of oil and gas wells.

[0004] The acid fracturing technology process recorded in the relevant technology is: circulating acid in the completion string, dragging high-pressure pipes through wire ropes to control the speed of the pipe, and the front nozzle breaking the rock at high speed and strong traction, which can achieve long-distance jet drilling, and the wire dragging can achieve controllable and stable drilling speed. This method has the advantages of accurate positioning and direction of the reservoir communication channel and convenient wire operation, but in this method, the wire directly suspends the nozzle and hangs the guide head, and the nozzle length is limited. Due to the large pulling force, the pipe is too long and the pipe deformation is large, which affects the flow channel. The large loss of hydraulic energy affects the drilling efficiency and even has the risk of pipe body breakage. Summary of the invention

[0005] In order to maximize the length of the nozzle that can be installed with the same axial installation size and improve the ability to communicate with the reservoir, the present application provides a roller storage pipe type reservoir communication device and a method of using the same.

[0006] The present application provides a drum storage tube type reservoir communication device adopts the following technical solution:

[0007] A drum-type reservoir communication device comprises a drum-type coil assembly and a sliding sleeve, wherein the sliding sleeve is lowered into a well;

[0008] The drum-type coil assembly comprises a core shaft, a coil tube, a nozzle, a limiter and a plug. The coil tube is rotatably connected to the core shaft, the nozzle is wound around the coil tube, a limit hole is formed on the core shaft, the limiter is inserted into the limit hole and is used to limit the rotation of the coil tube, the plug is located in the limit hole and is used to limit the limiter from detaching from the limit hole, a guide hole is formed on the coil tube, one end of the nozzle is located in the guide hole and a nozzle is formed at the end, and the diameter of the nozzle is smaller than the diameter of the guide hole;

[0009] The sliding sleeve includes an outer cylinder, an inner cylinder and a shear pin, the inner cylinder is slidably connected to the outer cylinder, the shear pin is arranged on the outer cylinder and is used to limit the sliding of the inner cylinder, the core shaft is connected to the inner cylinder, a transition hole is provided on the inner cylinder, an injection hole is provided on the outer cylinder, the guide hole is connected with the transition hole, when the shear pin limits the sliding of the inner cylinder, the transition hole and the injection hole are not connected, when the shear pin releases the restriction, the guide hole, the transition hole and the injection hole can all be connected.

[0010] By adopting the above technical solution, in the initial working state, the shear pins limit the inner tube, that is, the inner tube cannot slide. At this time, the transition hole and the injection hole are not connected. Acid is pumped into the nozzle through the ground to achieve pressure holding in the nozzle. When the pressure reaches a certain level, the drum coil assembly pushes the inner tube to cut off the shear pins and continue to move downward until the guide hole, the transition hole and the injection hole are all connected, thereby forming an injection channel; the acid continues to be pumped into the nozzle, and the acid dissolves the wire plug. Under the action of hydraulic force, the limiter falls off the coil tube, and the coil tube is no longer restricted; as the acid continues to be pumped, since the diameter of the nozzle is much smaller than the diameter of the guide hole, the nozzle generates traction due to the throttling pressure and drives the nozzle to extend outward. At the same time, under the extension of the nozzle, the coil tube rotates and releases the nozzle. Since the nozzle diameter is small, a high-pressure acid erosion jet can be formed to break the rock and form holes; as the acid continues to be pumped until all nozzles are driven into the reservoir, a longer reservoir channel is finally formed. In this way, by spirally winding the nozzle on the coil tube and utilizing the pressure difference and the special properties of the acid, the nozzle can be automatically sent into the channel, thereby maximizing the nozzle length that can be installed with the same axial installation size and improving the ability to communicate with the reservoir.

[0011] Optionally, the coil tube includes a first limiting portion for opening the guide hole, a connecting portion for winding the nozzle and a second limiting portion for connecting to the inner tube, the connecting portion is located between the first limiting portion and the second limiting portion, a guide block is provided on the core shaft, and an orientation for the guide block to be embedded is provided on the inner tube.

[0012] By adopting the above technical solution, during installation, the nozzle is wrapped around the connecting part, the guide block is set on the core shaft, and the core shaft is lowered into the sliding sleeve. When the guide block reaches the directional groove, the guide block and the directional groove are snap-fitted and fixed.

[0013] Optionally, the guide block is sized in two directions, namely, height and width, and the orientation groove is sized in two directions, namely, width and depth. When the sizes of the guide block and the orientation groove match, the inner cylinder and the core shaft are snap-fitted.

[0014] By adopting the above technical solution, the size of the guide block is determined in terms of height and width, and the size of the directional groove is determined in terms of width and depth. In this way, a plurality of guide blocks of different sizes can be set, and a plurality of directional grooves of different sizes can be opened. When and only when the size of the guide block matches the size of the directional groove, the inner cylinder and the core shaft can be fixed, so that construction operations can be carried out at different depths.

[0015] Optionally, the guide block and the core shaft are detachably connected.

[0016] By adopting the above technical solution, suitable guide blocks are installed according to actual construction needs, so as to realize multiple utilization of resources and reduce construction costs.

[0017] Optionally, two groups of symmetrically arranged guide cambered surfaces are formed on the inner wall of the inner cylinder, and the two guide cambered surfaces are arranged along the length direction of the inner cylinder.

[0018] By adopting the above technical solution, when the positioning groove and the guide block are not compatible, the guide arc surface facilitates the drum-type coil assembly to pass smoothly through the interior of the inner tube.

[0019] Optionally, a sealing component is provided in the injection hole, and the sealing component can allow the nozzle to pass through and can prevent liquid from passing through the sealing surface.

[0020] By adopting the above technical solution, the sealing component can play a sealing role to prevent the acid from flowing back through the injection hole.

[0021] Optionally, a connecting cap is further included, which is connected to the core shaft and is used to drive the roller coil assembly to slide in the sliding sleeve along the length of the sliding sleeve.

[0022] By adopting the above technical solution, the connecting cap facilitates the lowering and recovery of the drum coil assembly. When the construction is completed, the drum coil assembly can be quickly recovered through the connecting cap, and the construction is convenient and efficient.

[0023] Optionally, the connecting cap includes a connecting head and a traction rope, the traction rope is connected to the connecting head, and the connecting head is detachably connected to the core shaft.

[0024] By adopting the above technical solution, the staff can control the position of the drum coil assembly through the traction rope on the ground, and the control method is convenient.

[0025] Optionally, both ends of the sliding sleeve can be connected to a pipe column.

[0026] By adopting the above technical solution, the sliding sleeve can be used as a part of the pipe string, that is, it can be operated at any depth, thereby improving practicality.

[0027] Optionally, a method for using a drum storage tube type reservoir communication device comprises the following steps:

[0028] Connecting the sliding sleeve to the pipe string and lowering it to a designated position underground;

[0029] Connecting the connecting cap to the mandrel;

[0030] Lowering and fixing the drum-type coil assembly: lowering the drum-type coil assembly into the sliding sleeve through the connecting cap, and then fixing the core shaft by using the guide block and the directional groove;

[0031] Pumping acid into the spray pipe: after the pressure reaches a certain level, the drum coil assembly pushes the inner tube to cut off the shear nails, so that the inner tube becomes a sliding state until the guide hole, the transition hole and the spray hole are all connected to form a spray channel;

[0032] Continue to pump the acid solution to dissolve the wire plug, causing the limiter to fall off;

[0033] The acid solution is continuously pumped until all the nozzles are driven into the reservoir: the nozzle at the front end of the nozzle generates a traction force due to the throttling pressure to drive the nozzle to extend outward, and at the same time, the nozzle drags the coil tube to rotate to release the nozzle;

[0034] After the operation is completed, the drum-type coil assembly is retracted through the connecting cap;

[0035] The guide block is replaced and the nozzle is re-coiled, and the well operation is carried out again.

[0036] By adopting the above technical solution, the construction process is as follows: the first step is to connect the sliding sleeve to the pipe string and lower it to the designated position underground; the second step is to connect the connecting cap to the core shaft; the third step is for the staff to control the traction rope to lower the drum coil assembly to the preset position according to the construction position, and use the guide block and the directional groove to fix the core shaft; the fourth step is to pump acid into the nozzle through the ground to achieve pressure holding in the nozzle. When the pressure reaches a certain level, the drum coil assembly pushes the inner tube to cut off the shear nails and continue to move downward until the guide hole, transition hole and injection hole are connected, thereby forming an injection channel; the fifth step is to continue to pump acid into the nozzle, and the acid will The wire plug is corroded. Under the action of hydraulic force, the limit piece falls off the core shaft, and the coil tube is no longer restricted. Step 6: As the acid continues to be pumped, since the diameter of the nozzle is much smaller than the diameter of the guide hole, the nozzle generates traction due to the throttling pressure and drives the nozzle to extend outward. At the same time, under the extension of the nozzle, the coil tube rotates and releases the nozzle. Due to the small diameter of the nozzle, a high-pressure acid erosion jet can be formed to break the rock and make holes. As the acid is continuously pumped until all the nozzles are driven into the reservoir, a longer reservoir channel is finally formed. Step 7: After the operation is completed, the drum coil assembly is retracted through the connecting cap. Finally, the guide block is replaced and the nozzle is re-coiled for another downhole operation.

[0037] In summary, the present application includes at least one of the following beneficial technical effects:

[0038] 1. The present application provides a drum-type reservoir communication device. For fracture-type carbonate oil and gas reservoirs, conventional acid fracturing technology cannot accurately communicate with the reservoir around the well, the fracturing position is highly random, the crack extension direction, depth and number are uncontrollable, and the fracturing production increase effect is not obvious. The existing technical inventions have deficiencies in the extension length of the cracks, the number of cracks, the flexibility and portability of construction operations, and the operating cost. Therefore, a drum-type reservoir communication device and supporting process methods are designed, which has long and large reservoir hole channels, can be reused many times, maintains the diameter in the pipe before and after the operation, has high construction efficiency, and is flexible and convenient. Multiple injection pipes are layered and coiled on the drum, and the drum is placed with a steel wire rope. After the drum is in place, the spray holes are oriented. When the fracturing fluid is pumped, the nozzle is gradually released as the drum rotates and drilled into the reservoir, thereby achieving the technical goals of fixed hole location, clear hole direction, deep reservoir hole channels, and multi-point hole making in the wellbore, so as to expand the contact area of ​​the reservoir around the wellbore, increase the oil leakage area of ​​the wellbore, and achieve the purpose of increasing the production of oil and gas wells;

[0039] 2. In this application, the jet pipe is wound around the coil tube in layers by means of a coil installation method. The same axial installation dimensions can maximize the length of the coil tube installed in the short section. A steel wire rope (or continuous tubing) is used to repeatedly deliver acid fracturing operations point by point from bottom to top along the wellbore. There are many channels and a large effective wellbore communication area. The construction is convenient and efficient, and thus has good deep reservoir communication capabilities;

[0040] 3. In the present application, the sliding sleeve is lowered along with the completion tubing, and the nozzle barrel assembly is lowered during acid fracturing. After the operation is completed, the drum coil assembly can be recovered. The tubing string is always kept in a free-diameter state before and after the operation, which is convenient for the lowering of other operating tools. Moreover, the drum coil assembly can be reused multiple times by only replacing the guide block component. It has strong applicability to well conditions and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a state diagram after the drum coil assembly is delivered to the matching sliding sleeve position in the present application;

[0042] Figure 2 It is a state diagram of the reservoir pores formed by the nozzle jet drilling in the formation in the present application;

[0043] Figure 3 is a cross-sectional view of a drum coil assembly in the present application;

[0044] Figure 4 is a cross-sectional view of the sliding sleeve in the present application;

[0045] Figure 5 It is a schematic diagram of the structure after the connection cap and the drum coil assembly in the present application are connected;

[0046] Figure 6 It is a schematic diagram of the structure of the inner cylinder in this application;

[0047] Figure 7 It is a flow chart of the method for using the drum storage tube type reservoir communication device in the present application.

[0048] Explanation of the reference numerals: 1. pipe column; 2. drum coil assembly; 21. core shaft; 22. nozzle; 23. coil tube; 231. first limiting portion; 232. connecting portion; 233. second limiting portion; 24. limiting member; 25. screw plug; 26. limiting hole; 27. guide hole; 28. nozzle; 29. ​​clamping ring; 210. isolation ring; 211. thrust bearing; 212. guide block; 3. sliding sleeve; 31. spray hole; 311. transition hole; 312. injection hole; 32. outer tube; 33. inner tube; 34. shear pin; 35. directional groove; 36. guide arc surface; 4. ball bearing; 5. connecting cap; 51. connecting head; 52. traction rope; 6. sealing assembly; 61. pressure ring; 62. sealing rubber ring. DETAILED DESCRIPTION

[0049] The following is combined with Figure 1-7 This application is described in further detail.

[0050] The present application embodiment discloses a drum storage tube type reservoir communication device, referring to Figure 1 and Figure 2The drum storage pipe type reservoir communication device includes a drum coil assembly 2 and a sliding sleeve 3. The drum coil assembly 2 is arranged in the sliding sleeve 3. The drum coil assembly 2 includes a core shaft 21 and a nozzle 22. The nozzle 22 is wound on the core shaft 21. The sliding sleeve 3 is provided with a spray hole 31. When acid is pumped in the nozzle 22, the nozzle 22 can be released from the core shaft 21 and drill into the reservoir through the spray hole 31.

[0051] During construction, acid is pumped into the nozzle 22 on the ground, and the nozzle 22 can be released from the core shaft 21 and drilled into the reservoir through the nozzle hole 31. Since the nozzle 22 is wound, that is, the axial straight line setting is changed to the axial winding setting, and the pressure difference and the special properties of the acid are used, the nozzle 22 can be automatically sent into the channel, thereby maximizing the length of the nozzle 22 that can be installed with the same axial installation size, and improving the ability to communicate with the reservoir.

[0052] Specifically, refer to Figure 2 and Figure 3 The drum-type coil assembly 2 further includes a coil tube 23, a stopper 24 and a screw plug 25. The coil tube 23 is rotatably connected to the core shaft 21 through a ball bearing 4. The nozzle 22 is wound around the coil tube 23. The coil tube 23 includes a first stopper 231, a connection part 232 and a second stopper 233. The connection part 232 is located between the first stopper 231 and the second stopper 233. The nozzle 22 is evenly wound around the connection part 232. Meanwhile, the first stopper 231 and the second stopper 233 limit the nozzle 22. A stopper hole 26 is formed on the core shaft 21. The stopper 24 is inserted into the stopper hole 26 and used to limit the rotation of the coil tube 23. The screw plug 25 is located in the stopper hole 26 and used to limit the stopper 24 from being separated from the stopper hole 26. A guide hole 27 is formed on the first limiting portion 231 . One end of the nozzle 22 is located in the guide hole 27 and a nozzle 28 is formed at the end. The diameter of the nozzle 28 is smaller than the diameter of the guide hole 27 .

[0053] Reference Figure 2 and Figure 4 The sliding sleeve 3 includes an outer cylinder 32, an inner cylinder 33 and a shear pin 34. The inner cylinder 33 is slidably connected to the outer cylinder 32. The shear pin 34 is arranged on the outer cylinder 32 and is used to limit the sliding of the inner cylinder 33. When the force on the inner cylinder 33 is large enough, the inner cylinder 33 can cut off the shear pin 34. The core shaft 21 is connected to the inner cylinder 33. The inner cylinder 33 is provided with a transition hole 311. The outer cylinder 32 is provided with a spray hole 312. The guide hole 27 is connected with the transition hole 311. When the shear pin 34 limits the sliding of the inner cylinder 33, the transition hole 311 and the spray hole 312 are not connected. When the shear pin 34 releases the restriction, the guide hole 27, the transition hole 311 and the spray hole 312 can all be connected. Among them, the transition hole 311 and the spray hole 312 together constitute the above-mentioned spray hole 31.

[0054] In the initial state, the shear pins 34 connect the inner cylinder 33 and the outer cylinder 32 together, and the inner cylinder 33 is fixed. The staff pumps acid into the nozzle 22 on the ground. Since the transition hole 311 and the injection hole 312 are not connected, the nozzle 22 is pressurized. As the pressure increases, the drum coil assembly 2 pushes the inner cylinder 33 to move, so that the inner cylinder 33 cuts off the shear pins 34. At this time, the inner cylinder 33 is released from the restriction, and the inner cylinder 33 slides on the outer cylinder 32, driving the drum coil assembly 2 to move together until the inner cylinder 33 slides to the limit position. At this time, the guide hole 27, the transition hole 311 and the injection hole 312 are all connected, thereby forming an injection channel. Continue to pump the acid, the acid will corrode the wire plug 25, under the action of hydraulic force, the limiter 24 will fall off the core shaft 21, and the coil tube 23 will no longer be restricted; at the same time, because the diameter of the nozzle 28 is much smaller than the diameter of the guide hole 27, the nozzle 28 generates traction due to the throttling pressure and drives the nozzle 22 to extend outward, and at the same time, under the extension of the nozzle 22, the coil tube 23 rotates to release the nozzle 22. Since the nozzle 28 has a small diameter, it can form a high-pressure acid erosion jet to break the rock and form a hole, and the nozzle 22 is driven into the reservoir, finally forming a longer reservoir channel.

[0055] Further, refer to Figure 2 and Figure 3 Since the coil tube 23 is connected to the core shaft 21 through the ball bearing 4, in order to play a limiting role, the drum type coil assembly 2 also includes a clamping ring 29, the clamping ring 29 is located at one end of the core shaft 21 close to the first limiting portion 231, the clamping ring 29 is threadedly connected to the core shaft 21, and the clamping ring 29 can block the bearing, thereby achieving a limiting effect.

[0056] In order to facilitate the installation of the limiter 24, the diameter of the end of the mandrel 21 away from the clamping ring 29 is larger than the end of the mandrel 21 close to the clamping ring 29, that is, the mandrel 21 is T-shaped as a whole. The drum coil assembly 2 also includes an isolation ring 210 and a thrust bearing 211, which are arranged between the ball bearing 4 and the mandrel 21, so as to achieve the purpose of limiting. In order to ensure the sealing performance and prevent the acid from flowing through the limit hole 26, thereby failing to achieve the purpose of holding pressure, a sealing ring is sleeved between the limiter 24 and the limit hole 26.

[0057] It should be noted that multiple nozzles 22 can be wound. In this embodiment, two nozzles 22 are used as an example for explanation. Of course, the number of nozzles 22 needs to be determined according to actual process requirements, and the guide holes, transition holes 311 and injection holes 312 need to correspond to the number of nozzles 22. In this way, holes can be made in multiple directions at the same time, thereby improving construction efficiency. In this embodiment, the limiter 24 can be a limit pin or other component that can achieve limit fixing. In addition, the connection method between the screw plug 25 and the core shaft 21 is a threaded connection.

[0058] In particular, refer to Figure 5 and Figure 6 A guide block 212 is provided on the core shaft 21, and an orientation groove 35 is provided on the inner cylinder 33 for the guide block 212 to be embedded. When the core shaft 21 slides along the length direction of the inner cylinder 33, the guide block 212 can be embedded in the orientation groove 35, so that the guide block 212 and the orientation groove 35 are snap-fitted and fixed. In this way, the inner cylinder 33 and the core shaft 21 are connected together, which facilitates the core shaft 21 and the inner cylinder 33 to move together.

[0059] The guide block 212 is sized in two directions, namely, height and width, and the directional groove 35 is sized in two directions, namely, width and depth. When the sizes of the guide block 212 and the directional groove 35 are adapted, the inner tube 33 and the core shaft 21 are snap-fitted. During construction, the two ends of the sliding sleeve 3 can be processed with special connecting threads for oil pipes, and connected to the pipe column 1 through the special connecting threads for oil pipes. In this way, the sliding sleeve 3 can be used as a part of the whole pipe column 1 and can be set at any depth. Of course, it can also be used in open hole wells, that is, the bottom of the sliding sleeve 3 directly contacts the bottom of the well, and the upper end of the sliding sleeve 3 is connected to the pipe column 1.

[0060] During construction, refer to Figure 5 and Figure 6 , multiple sliding sleeves 3 can be set, and the sliding sleeves 3 are set to a corresponding depth according to the construction requirements. The difference between each sliding sleeve 3 is that the size of the directional groove 35 on the inner cylinder 33 is different. According to the needs, a corresponding guide block 212 is set on the core shaft 21, and then the core shaft 21 is lowered into the well. When the guide block 212 and the directional groove 35 are not matched, the inner cylinder 33 and the core shaft 21 cannot be fixed, and the core shaft 21 will continue to slide until the guide block 212 and the directional groove 35 are matched, and the inner cylinder 33 and the core shaft 21 are fixed. In this way, the size of the guide block 212 is determined in two directions of height and width, and the size of the directional groove 35 is determined in two directions of width and depth. In this way, multiple guide blocks 212 of different sizes can be set. When and only when the size of the guide block 212 and the size of the directional groove 35 are matched, the inner cylinder 33 and the core shaft 21 can be fixed, so that continuous construction operations can be carried out at different depths.

[0061] Reference Figure 1 and Figure 2The drum storage pipe type reservoir communication device also includes a connection cap 5, which includes a connector 51 and a traction rope 52. The traction rope 52 is connected to the connector 51, and the connector 51 is detachably connected to the core shaft 21. The detachable connection method can be threaded connection. The staff on the ground controls the traction rope 52 to drive the drum coil assembly 2 to slide along the length of the sliding sleeve 3 in the sliding sleeve 3, and controls the drum coil assembly 2 to be lowered to a preset depth. When the construction is completed, the traction rope 52 is retracted to achieve the recovery of the drum coil assembly 2. In this way, the resources can be reused, and the operation cost is low. At the same time, the acid fracturing operation can be repeatedly delivered point by point from top to bottom along the well for many times. The effective communication area of ​​the wellbore is large, the construction is convenient and efficient, the operation cycle is short, and the cost is low. On the other hand, by retracting the drum coil assembly 2, it is ensured that the pipe string 1 is in full diameter, which is convenient for other operation tools to be lowered, and the well condition applicability is strong.

[0062] Of course, the guide block 212 and the mandrel 21 are detachably connected. In this embodiment, the guide block 212 and the mandrel 21 are connected by plugging, and according to actual work requirements, a suitable guide block 212 can be quickly replaced. According to actual construction requirements, a suitable guide block 212 is installed to achieve multiple uses of the mandrel 21 and reduce construction costs.

[0063] It should be noted that, in order to facilitate the nozzle 22 to extend outward, the guide hole, transition hole 311 and injection hole 312 are all inclined. Of course, the number of shear pins 34 depends on the working pressure of the sliding sleeve 3. The shear pins 34 need to ensure that the inner tube 33 and the outer tube 32 are fixed together to achieve bidirectional locking in the axial direction.

[0064] Reference Figure 4 A sealing assembly 6 is provided in the injection hole 312. The sealing assembly 6 can allow the nozzle 22 to pass through and can prevent the liquid from passing through the sealing surface. Specifically, the sealing assembly 6 includes a pressure ring 61 and a sealing rubber ring 62. The pressure ring 61 is connected to the injection hole 312 through threads, and the sealing rubber ring 62 is pressed into the injection hole 312. The outer edge of the sealing rubber ring 62 contacts the inner wall of the injection hole 312. When the nozzle 22 extends outward, it can pass through the sealing rubber ring 62. The inner wall of the sealing rubber ring 62 contacts the outer edge of the nozzle 22, thereby achieving internal and external bidirectional sealing to prevent the fluid from passing through the sealing surface.

[0065] Reference Figure 5 and Figure 6 Two sets of symmetrically arranged guide arc surfaces 36 are formed on the inner wall of the inner cylinder 33, and the two guide arc surfaces 36 are arranged along the length direction of the inner cylinder 33. When the positioning groove and the guide block 212 are not compatible, the guide arc surfaces 36 facilitate the smooth passage of the drum-type coil assembly 2 through the inner cylinder 33, and also facilitate the recovery of the drum-type coil assembly 2. Of course, the end surface of the guide block 212 is also formed into an arc or processed with a round chamfer, which reduces the contact stress and facilitates sliding on the guide arc surfaces 36.

[0066] Of course, the outer wall of the inner cylinder 33 is sleeved with a plurality of O-rings to improve the sealing between the inner cylinder 33 and the outer cylinder 32 .

[0067] It is understandable that, according to actual installation requirements, sealing rings are added at corresponding positions to improve the sealing and compactness of the structure. This is a well-known technology among those skilled in the art and will not be described in detail in this embodiment.

[0068] The implementation principle of a drum storage pipe type reservoir communication device in the embodiment of the present application is as follows: first, the sliding sleeve 3 is connected to the pipe string 1 and lowered into the well, and the connecting cap 5 is connected to the core shaft 21. The staff on the ground controls the depth of the drum type coil assembly 2 by controlling the traction rope 52, and realizes the fixed connection between the core shaft 21 and the inner tube 33 through the cooperation of the guide block 212 and the directional groove 35. In the initial working state, the shear nail 34 realizes the limit of the inner tube 33. At this time, the transition hole 311 and the injection hole 312 are not connected. Acid is pumped into the nozzle 22 through the ground, and the nozzle 22 is pressurized. When the pressure reaches a certain level, the drum type coil assembly 2 pushes the inner tube 33 to cut off the shear nail 34 and then continues to move downward. Until the guide hole 27, the transition hole 311 and the injection hole 312 are all connected, thereby forming an injection channel; continue to pump acid into the nozzle 22, the acid will dissolve the wire plug 25, and under the action of hydraulic force, the limiter 24 will fall off the core shaft 21, and the coil tube 23 is no longer restricted; as the acid continues to be pumped, since the diameter of the nozzle 28 is much smaller than the diameter of the guide hole 27, the nozzle 28 generates traction due to the throttling pressure and drives the nozzle 22 to extend outward. At the same time, under the extension of the nozzle 22, the coil tube 23 rotates to release the nozzle 22. Since the diameter of the nozzle 28 is small, a high-pressure acid erosion jet can be formed to break the rock and form holes; as the acid continues to be pumped, until all the nozzles 22 are driven into the reservoir, a longer reservoir channel is finally formed. In this way, by spirally winding the nozzle 22 on the coil tube 23 and utilizing the pressure difference and the special properties of the acid, the nozzle 22 can be automatically sent into the channel, thereby maximizing the length of the nozzle 22 that can be installed with the same axial installation size and improving the ability to communicate with the reservoir.

[0069] The present application also discloses a method for using a drum-type reservoir communication device, which uses the drum-type reservoir communication device in this embodiment. Figure 7 The method for using the drum storage tube type reservoir communication device comprises the following steps:

[0070] The first step is to connect the sliding sleeve 3 to the pipe string 1 and lower it to a designated position underground;

[0071] During operation, the two ends of the sliding sleeve 3 are connected to the pipe string 1 through the special connecting threads of the oil pipe, and lowered into the well. Of course, it can also be used in a bare hole well, that is, the bottom of the sliding sleeve 3 directly abuts against the bottom of the well, and the upper end of the sliding sleeve 3 is connected to the pipe string 1.

[0072] Step 2: Connect the connecting cap 5 to the core shaft 21;

[0073] The connector 51 is threadedly connected to the core shaft 21 .

[0074] Step 3: Lower and fix the drum type coil assembly 2;

[0075] The staff controls the lowering depth of the drum-type coil assembly 2 by controlling the traction rope 52 on the ground, and then realizes the fixed connection between the core shaft 21 and the inner tube 33 through the cooperation of the guide block 212 and the directional groove 35.

[0076] Step 4: pumping acid to cause the inner tube 33 to slide;

[0077] The staff pumps acid into the nozzle 22 on the ground. Since the transition hole 311 and the injection hole 312 are not connected, the nozzle 22 is pressurized. As the pressure increases, the drum coil assembly 2 pushes the inner tube 33 to cut off the shear nails 34, so that the inner tube 33 enters a sliding state until the guide hole 27, the transition hole 311 and the injection hole 312 are all connected to form an injection channel.

[0078] Step 5: Continue to pump the acid solution to dissolve the wire plug 25 and cause the stopper 24 to fall off;

[0079] As the acid is continuously pumped, the amount of the acid increases and slowly corrodes the wire plug 25, causing the limiter 24 to be limited. Under the action of the hydraulic pressure, the limiter 24 falls off and the coil tube 23 is released from the limit.

[0080] Step 6: Continue pumping the acid solution until all nozzles 22 are driven into the reservoir;

[0081] The nozzle 28 at the front end of the nozzle 22 generates traction due to the throttling pressure, driving the nozzle 22 to extend outward, and at the same time, the nozzle 22 drags the coil tube 23 to rotate and release the nozzle 22. Since the nozzle 28 has a small diameter, it can form a high-pressure acid erosion jet to break the rock and form holes; with the continuous pumping of acid, until all the nozzles 22 are driven into the reservoir, a longer reservoir channel is finally formed.

[0082] Step 7: After the operation is completed, the drum coil assembly 2 is retracted through the connecting cap 5;

[0083] When all the nozzles 22 are driven into the holes, the staff controls the traction rope 52 on the ground to retract it, thereby retracting the drum-type coil assembly 2.

[0084] Step 8: Replace the guide block 212 and rewind the nozzle 22 to perform the downhole operation again.

[0085] The staff replaces the guide block 212 with another size and rewinds the nozzle 22 to carry out the downhole operation again.

[0086] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A drum storage tube type reservoir communication device, characterized in that: It comprises a drum-type coiled tubing assembly (2) and a sliding sleeve (3), wherein the sliding sleeve (3) is lowered into the well; The drum-type coil assembly (2) comprises a core shaft (21), a coil tube (23), a nozzle (22), a limiter (24) and a plug (25); the coil tube (23) is rotatably connected to the core shaft (21); the nozzle (22) is wound around the coil tube (23); a limiter hole (26) is formed on the core shaft (21); the limiter (24) is inserted into the limiter hole (26) and is used to limit the rotation of the coil tube (23); the plug (25) is located in the limiter hole (26) and is used to limit the limiter (24) from being separated from the limiter hole (26); a guide hole (27) is opened on the coil tube (23); one end of the nozzle (22) is located in the guide hole (27) and a nozzle (28) is formed at the end; the diameter of the nozzle (28) is smaller than the diameter of the guide hole (27); The sliding sleeve (3) comprises an outer cylinder (32), an inner cylinder (33) and a shear pin (34); the inner cylinder (33) is slidably connected to the outer cylinder (32); the shear pin (34) is arranged on the outer cylinder (32) and is used to limit the sliding of the inner cylinder (33); the core shaft (21) is connected to the inner cylinder (33); a transition hole (311) is provided on the inner cylinder (33); an injection hole (312) is provided on the outer cylinder (32); the guide hole (27) is connected to the transition hole (311); when the shear pin (34) limits the sliding of the inner cylinder (33), the transition hole (311) and the injection hole (312) are not connected; when the shear pin (34) releases the restriction, the guide hole (27), the transition hole (311) and the injection hole (312) can all be connected.

2. The drum-storage-tube type reservoir communication device according to claim 1, characterized in that: The coil tube (23) comprises a first limiting portion (231) for opening the guide hole (27), a connecting portion (232) for winding the nozzle (22) and a second limiting portion (233) for connecting with the inner tube (33), wherein the connecting portion (232) is located between the first limiting portion (231) and the second limiting portion (233), the core shaft (21) is provided with a guide block (212), and the inner tube (33) is provided with an orientation groove (35) for the guide block (212) to be embedded.

3. The drum-storage-tube type reservoir communication device according to claim 2, characterized in that: The guide block (212) has dimensions determined by height and width, and the orientation groove (35) has dimensions determined by width and depth. When the dimensions of the guide block (212) and the orientation groove (35) match, the inner cylinder (33) and the core shaft (21) are snap-fitted.

4. The drum-storage-tube type reservoir communication device according to claim 3, characterized in that: The guide block (212) and the core shaft (21) are detachably connected.

5. The drum-storage-tube type reservoir communication device according to claim 4, characterized in that: Two groups of symmetrically arranged guide cambered surfaces (36) are formed on the inner wall of the inner cylinder (33), and the two guide cambered surfaces (36) are arranged along the length direction of the inner cylinder (33).

6. The drum-storage-tube type reservoir communication device according to claim 5, characterized in that: A sealing component (6) is arranged in the injection hole (312), and the sealing component (6) can allow the nozzle (22) to pass through and can prevent liquid from passing through the sealing surface.

7. The drum-storage-tube type reservoir communication device according to claim 6, characterized in that: It also comprises a connecting cap (5), which is connected to the core shaft (21) and is used to drive the roller-type coil assembly (2) to slide inside the sliding sleeve (3) along the length of the sliding sleeve (3).

8. The drum-storage-tube type reservoir communication device according to claim 7, characterized in that: The connecting cap (5) comprises a connecting head (51) and a traction rope (52), wherein the traction rope (52) is connected to the connecting head (51), and the connecting head (51) is detachably connected to the core shaft (21).

9. The drum-storage-tube type reservoir communication device according to claim 8, characterized in that: Both ends of the sliding sleeve (3) can be connected to the pipe column (1).

10. A method for using a drum-tube-type reservoir communication device, using the drum-tube-type reservoir communication device as claimed in claim 9, characterized in that: The following steps are involved: Connecting the sliding sleeve (3) to the pipe string (1) and lowering it to a designated position underground; Connecting the connecting cap (5) to the core shaft (21); Lowering and fixing the roller-type coil assembly (2): lowering the roller-type coil assembly (2) into the sliding sleeve (3) through the connecting cap (5), and then fixing the core shaft (21) by using the guide block (212) and the orientation groove (35); Acid is pumped into the spray pipe (22); after the pressure reaches a certain level, the drum coil assembly (2) pushes the inner tube (33) to cut off the shear nail (34), so that the inner tube (33) becomes a sliding state until the guide hole (27), the transition hole (311) and the spray hole (312) are all connected to form a spray channel; Continue to pump the acid solution to dissolve the wire plug (25), causing the stopper (24) to fall off; The acid solution is continuously pumped until all the nozzles (22) are driven into the reservoir: the nozzle (28) at the front end of the nozzle (22) generates a traction force due to the throttling pressure to drive the nozzle (22) to extend outward, and at the same time, the nozzle (22) drags the coil tube (23) to rotate to release the nozzle (22); After the operation is completed, the drum-type coil assembly (2) is retracted through the connecting cap (5); The guide block (212) is replaced and the nozzle (22) is rewound before the well operation is resumed.

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