Concentric penetrating type packer for cable casting and pulling electric pump production well

Abstract

The invention discloses a concentric penetrating type packer for a cable casting and pulling electric pump production well. The concentric penetrating type packer comprises a central pipe, and the two ends of the central pipe are connected with a lifting short section and a hydraulic control pipeline protection barrel respectively. A pressing ring, a mud blocking ring, an upper cone, a one-way slip, a lower cone, a cone sealing sleeve, a piston and a rubber sleeve are sequentially arranged outside the portion, between the lifting nipple and the hydraulic control pipeline protection barrel, of the center pipe in a sleeving mode. The power cable and the hydraulic control pipeline penetrate into the center pipe from the hydraulic control pipeline protection cylinder end, the other end of the power cable extends out of the lifting short section, and the pipeline, located in the lifting short section, of the hydraulic control pipeline is provided with a constant-pressure fracturing mechanism. The anchoring function is achieved through the anchor tile mechanism, the packer is continuously controlled through hydraulic pressure in the hydraulic control pipeline, the continuous packing function is achieved, and the pressure grade reaches 21 MPa; the packer can be recycled by unloading the pressure of the hydraulic control pipeline and lifting the power cable, the operation is simple, and the function is reliable.

Description

Technical Field

[0001] The invention belongs to the field of offshore oil exploitation and production, and in particular relates to a concentric penetration type packer for a cable casting and fishing electric pump production well. Background Art

[0002] At present, conventional concentric penetration type packers adopt a single rubber tube structure, which has poor sealing ability and cannot guarantee the sealing ability for a long time or under high pressure conditions. The single locking anchor shoe mechanism has low reliability and is difficult to recover, and it is also impossible to achieve concentric penetration. Summary of the invention

[0003] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a concentric penetration type packer for a cable casting and fishing electric pump production well.

[0004] The present invention is achieved through the following technical solutions:

[0005] A concentric through-type packer for cable-casting electric pump production wells comprises a center tube, both ends of which are respectively connected to a lifting pup joint and a hydraulic control pipeline protection tube; a pressure ring, a mud retaining ring, an upper cone, a lower cone, a cone sealing sleeve, a piston and a rubber tube are sequentially sleeved on the outside of the center tube between the lifting pup joint and the hydraulic control pipeline protection tube; a plurality of one-way slips are evenly distributed along the circumference between the upper cone and the lower cone; a hydraulic control pipeline elastic joint is sleeved on the outside of the center tube located inside the hydraulic control pipeline protection tube, one end of the elastic joint is connected to the hydraulic channel of the center tube through a sleeve pipe joint, the other end extends into the cable channel of the center tube, and is connected to the hydraulic control pipeline through a constant pressure rupture mechanism; one end of the power cable penetrates into the cable channel of the center tube from the outer wall of the center tube located inside the hydraulic control pipeline protection tube, and the other end extends out of the lifting pup joint.

[0006] In the above technical scheme, the lifting short section and the center pipe are connected by threads, and a No. I sealing ring is arranged between the inner wall of the lifting short section and the outer wall of the center pipe; a plurality of oil production holes are evenly distributed on the outer wall of the connecting end of the lifting short section and the center pipe, and the oil production holes are arranged below the No. I sealing ring, and the oil production holes are connected with the annular oil production channel of the center pipe; the pressure ring and the center pipe are fixed by a plurality of No. I fixing pins arranged along the circumferential direction, and a stepped through hole is formed in the middle of the pressure ring, and the large diameter end of the stepped through hole is sleeved on the outside of the mud guard ring; the mud guard ring is a sleeve structure, and a plurality of annular mud guard ridges are evenly distributed on its outer wall along the axial direction, and the cross-section of the mud guard ridges is trapezoidal; a plurality of drag reduction holes are evenly distributed along the circumference of the mud guard ridges, and the drag reduction holes are opened along the axial direction.

[0007] In the above technical solution, the upper cone is connected to the center tube by a thread; the upper cone is a sleeve-type structure, and the end face of its mud guard ring forms a mud guard ring fixing groove, and the mud guard ring is inserted into the mud guard ring fixing groove; the outer wall of the upper cone is evenly distributed along the circumference with multiple cava grooves for installing one-way cava, and the bottom of the cava groove is an inclined surface.

[0008] In the above technical solution, the one-way slip is a one-way slip that can only be anchored downward. Figure 1 It can be seen that the slip teeth are inclined downward, and there is resistance when moving downward, but no resistance when moving upward. When the one-way slip is subjected to an upward unsealing force, the packer can be smoothly moved upward; it is limited by the upper cone 4 and the lower cone 6.

[0009] In the above technical scheme, the lower cone is a sleeve structure, and its end face of the slip end is evenly distributed with a plurality of slip installation grooves along the circumference; the lower end of the one-way slip is inserted into the slip installation groove; a stepped through hole is formed in the middle of the lower cone, the small diameter end of the stepped through hole is threadedly connected to the center pipe, and a No. II sealing ring is arranged between the two, the large diameter end of the stepped through hole is sleeved on the outside of the cone sealing sleeve, and the lower cone and the cone sealing sleeve are fixed by a plurality of No. I shear pins evenly distributed along the circumference.

[0010] In the above technical scheme, the cone sealing sleeve is threadedly connected to the center tube; the cone sealing sleeve is a sleeve structure, and a convex ring is formed on the middle outer wall. The cone sealing sleeve above the convex ring is inserted into the stepped hole of the lower cone, and a No. III sealing ring is arranged between the cone sealing sleeve and the lower cone, and a No. IV sealing ring is arranged between the cone sealing sleeve and the center tube; the cone sealing sleeve below the convex ring is inserted into the piston, and a No. V sealing ring is arranged between the cone sealing sleeve and the piston; a hydraulic ring groove is formed on the inner wall of the cone sealing sleeve above the No. IV sealing ring, and the hydraulic ring groove is connected with the hydraulic channel of the center tube through the No. I pressure transmission channel.

[0011] In the above technical solution, the piston is a sleeve structure with a stepped hole formed in the middle. The large diameter end of the stepped hole is sleeved on the outside of the conical sealing sleeve. The two are fixed by multiple No. Ⅱ shear pins evenly distributed along the circumference, and a No. Ⅴ sealing ring is provided between the inner wall of the large diameter end of the stepped hole of the piston and the conical sealing sleeve; a No. Ⅵ sealing ring is provided between the inner wall of the piston and the outer wall of the center tube; the large diameter end of the stepped hole of the piston is connected to the hydraulic channel of the center tube through the No. Ⅱ pressure transmission channel.

[0012] In the above technical solution, the outer wall of the middle and lower ends of the central tube forms a positioning convex ring, the rubber tube is placed between the positioning convex ring and the piston, and the end face of the hydraulic control pipeline protection tube is in close contact with the end face of the positioning convex ring;

[0013] The outer wall of the lower end of the central tube forms a two-step longitudinal section step, and the vertical distance from the first step plane of the longitudinal section step to the central axis is smaller than the vertical distance from the second step plane to the central axis; the first step plane of the longitudinal section step extends to the end face of the positioning convex ring; the first step plane of the longitudinal section step forms a threading hole, the threading hole is connected to the cable channel of the central tube, and the threading hole is inclined; the combined design of the inclined threading hole and the two-step longitudinal section step realizes an S-shaped passage when the cable passes through the central tube; a cable shield is arranged above the second step plane of the longitudinal section step;

[0014] A cable channel is formed in the middle of the central tube and is arranged concentrically with the central tube. An oil production channel and a hydraulic channel are formed outside the cable channel. The cross section of the oil production channel is C-shaped. A hydraulic plug is arranged at one end of the hydraulic channel, and a ferrule-type joint is arranged at the other end.

[0015] The outer wall of the central tube forms a pressure transmission channel No. Ⅰ and a pressure transmission channel No. Ⅱ arranged in the radial direction, and both the pressure transmission channel No. Ⅰ and the pressure transmission channel No. Ⅱ are communicated with the hydraulic channel.

[0016] In the above technical scheme, the constant-pressure rupture mechanism includes an outer cylinder short section and a fixing ring, a pressure cap, a rupture disk and a support tube which are sequentially arranged inside the outer cylinder short section; the outer cylinder short section is a sleeve structure; the fixing ring is a sleeve structure, and the outer wall of the fixing ring is threadedly connected to the inner wall of the outer cylinder short section; the pressure cap is a sleeve structure; the rupture disk is a disc-mounted structure composed of an intermediate spherical surface and a circular ring connected to the edge of the spherical surface, and the two ends of the circular ring of the rupture disk are respectively welded and fixed to the pressure cap and the support tube; an annular groove is formed on the outer wall of the support tube, and a constant-pressure rupture sealing ring is arranged in the groove.

[0017] In the above technical solution, the outlet end of the hydraulic control pipeline elastic joint is connected to the hydraulic control interface at the lower end of the center tube through a ferrule joint; the hydraulic control pipeline elastic joint is wound in a spiral shape, and the inlet end passes through the center of the spiral. The spiral design of the hydraulic control pipeline elastic joint can achieve axial expansion and contraction, and the outlet end of the hydraulic control pipeline elastic joint is inclined.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a concentric through-type packer for a cable-casting electric pump production well. The anchoring function is achieved through an anchor shoe mechanism. The packer is continuously controlled by the hydraulic pressure in a hydraulic control pipeline to achieve a continuous isolation function. The pressure level reaches 21 MPa. The packer can be recovered by unloading the pressure of the hydraulic control pipeline and lifting the power cable. The operation is simple, the sealing is reliable, the recovery force requirement is reduced, the operating efficiency of the cable-casting electric pump is improved, and the safety factor of the wellbore string is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a stereogram of the present invention;

[0021] Figure 2 It is a partially enlarged stereogram of the present invention;

[0022] Figure 3 It is a cross-sectional view of the overall structure of the present invention;

[0023] Figure 4 yes Figure 3 A-axis sectional view;

[0024] Figure 5 yes Figure 3Middle B-direction sectional view;

[0025] Figure 6 yes Figure 3 Middle C-axis section view;

[0026] Figure 7 yes Figure 3 A partial enlarged view of point Ⅰ in the middle;

[0027] Figure 8 is a stereogram of the center tube of the present invention;

[0028] Fig. 9 is a top view of the central tube of the present invention;

[0029] Fig.10 It is a structural schematic diagram of the constant pressure fracturing mechanism in the present invention;

[0030] Fig.11 It is a cross-sectional view of the hydraulic control pipeline protection tube of the present invention;

[0031] Fig.12 It is a schematic diagram of the structure of the hydraulic control pipeline elastic joint in the present invention;

[0032] Fig.13 It is a schematic diagram of the use state of the present invention.

[0033] in:

[0034] 1. Lifting nipple; 101. Oil production hole; 102. No. Ⅰ sealing ring;

[0035] 2. Pressing ring; 201. No. Ⅰ fixing pin;

[0036] 3. Mud guard ring; 301. Mud guard convex strip; 302. Drag reduction hole;

[0037] 4. Upper cone; 401, slip groove;

[0038] 5. One-way slip;

[0039] 6. Lower cone; 601. Slip installation groove; 602. No. Ⅰ shear pin; 603. No. Ⅱ sealing ring;

[0040] 7. Cone sealing sleeve; 701. No. III sealing ring; 702. No. IV sealing ring; 703. No. V sealing ring; 704. Hydraulic ring groove;

[0041] 8. Piston; 801. No. II shear pin; 802. No. VI sealing ring;

[0042] 9. Central tube; 901. Hydraulic channel; 902. Cable channel; 903. Oil production channel; 904. No. Ⅰ pressure transmission channel; 905. No. Ⅱ pressure transmission channel; 906. Positioning convex ring; 907. Longitudinal section step; 908. Threading hole;

[0043] 10. Constant pressure rupture mechanism; 1001. Outer tube short section; 1002. Fixing ring; 1003. Pressure cap; 1004. Rupture disk; 1005. Support tube; 1006. Constant pressure rupture sealing ring;

[0044] 11. Hydraulic plug;

[0045] 12. Compression fittings;

[0046] 13. Elastic joint of hydraulic control pipeline; 1301. Inlet end; 1302. Outlet end;

[0047] 14. Hydraulic control pipeline protection tube; 141. Crossing cable channel;

[0048] 15. Power cable;

[0049] 16. Rubber cartridge;

[0050] 17. Fixing screws;

[0051] 18. Cable shield;

[0052] 19. Hydraulic control pipeline.

[0053] a. integrated cable; b. bridle; c. concentric through-type packer (this application); d. submersible electric pump unit; e. small casing; f. completion casing.

[0054] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0055] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0056] like Figures 1 to 12 As shown, a concentric through-type packer for cable-cast electric pump production wells comprises a central tube 9, two ends of which are respectively connected to a lifting sub 1 and a hydraulic control pipeline protection tube 14; a pressure ring 2, a mud retaining ring 3, an upper cone 4, a lower cone 6, a cone sealing sleeve 7, a piston 8 and a rubber tube 16 are sequentially sleeved on the outside of the central tube 9 between the lifting sub 1 and the hydraulic control pipeline protection tube 14; a plurality of one-way slips 5 are evenly distributed along the circumference between the upper cone 4 and the lower cone 6;

[0057] A hydraulic control pipeline elastic joint 13 is sleeved on the outside of the central tube 9 located inside the hydraulic control pipeline protection tube 14. One end of the elastic joint 13 is connected to the hydraulic channel 901 of the central tube 9 through the sleeve joint 12, and the other end extends into the cable channel 902 of the central tube 9, and is connected to the hydraulic control pipeline 19 through the constant pressure rupture mechanism 10; one end of the power cable 15 penetrates into the cable channel 902 of the central tube 9 from the outer wall of the central tube 9 located inside the hydraulic control pipeline protection tube 14, and the other end extends out from the lifting short section 1.

[0058] The lifting pup joint 1 and the center pipe 9 are connected by threads, and a No. I sealing ring 102 is arranged between the inner wall of the lifting pup joint 1 and the outer wall of the center pipe 9; a plurality of oil production holes 101 are evenly distributed on the outer wall of the connection end between the lifting pup joint 1 and the center pipe 9, and the oil production holes 101 are arranged below the No. I sealing ring 102, and the oil production holes 101 are connected with the annular oil production channel 93 of the center pipe 9.

[0059] The pressure ring 2 and the center pipe 9 are fixed by a plurality of No. Ⅰ fixing pins 201 arranged along the circumferential direction. A stepped through hole is formed in the middle of the pressure ring 2. The large diameter end of the stepped through hole is sleeved on the outside of the mud guard ring 3.

[0060] The mud guard ring 3 is a sleeve structure, and its outer wall is evenly provided with multiple annular mud guard ridges 301 along the axial direction. The cross section of the mud guard ridge 301 is trapezoidal. A plurality of drag reduction holes 302 are evenly distributed along the circumference of the mud guard ridge 301, and the drag reduction holes 302 are opened along the axial direction.

[0061] The upper cone 4 is connected to the center pipe 9 by threads; the upper cone 4 is a sleeve-type structure, and the end face of its mud guard ring forms a mud guard ring fixing groove, and the mud guard ring 3 is inserted into the mud guard ring fixing groove; the outer wall of the upper cone 4 is evenly distributed along the circumference with multiple cava grooves 401 for installing one-way cava 5, and the bottom of the cava groove 401 is an inclined surface.

[0062] The one-way slip 5 is a one-way slip that can only be anchored downward. Figure 1 It can be seen that the slip teeth are inclined downward, and there is resistance when moving downward, but no resistance when moving upward. When the one-way slip 5 is subjected to an upward unsealing force, the packer can be smoothly moved upward; it is limited by the upper cone 4 and the lower cone 6.

[0063] The lower cone 6 is a sleeve structure, and its end surface has multiple slip installation grooves 601 evenly distributed along the circumference; the lower end of the one-way slip 5 is inserted into the slip installation groove 601; a stepped through hole is formed in the middle of the lower cone 6, the small diameter end of the stepped through hole is threadedly connected to the center pipe 9, and a No. II sealing ring 603 is arranged between the two, and the large diameter end of the stepped through hole is sleeved on the outside of the cone sealing sleeve 7, and the lower cone 6 and the cone sealing sleeve 7 are fixed by multiple No. I shear pins 602 evenly distributed along the circumference.

[0064] The cone sealing sleeve 7 is threadedly connected to the center tube 9; the cone sealing sleeve 7 is a sleeve structure, and a convex ring is formed on the middle outer wall. The cone sealing sleeve 7 above the convex ring is inserted into the stepped hole of the lower cone 6, and a No. III sealing ring 701 is arranged between the cone sealing sleeve 7 and the lower cone 6, and a No. IV sealing ring 702 is arranged between the cone sealing sleeve 7 and the center tube 9; the cone sealing sleeve 7 below the convex ring is inserted into the piston 8, and a No. V sealing ring 703 is arranged between the cone sealing sleeve 7 and the piston 8; a hydraulic ring groove 704 is formed on the inner wall of the cone sealing sleeve 7 above the No. IV sealing ring 702, and the hydraulic ring groove 704 is connected to the hydraulic channel 901 of the center tube 9 through the No. I pressure transmission channel 904; the hydraulic pressure pushes the shear pin of the lower cone 6 through the pressure transmission channel 904, so that the one-way slip 5 is hung on the small casing; during the operation, the hydraulic control pipeline continuously provides hydraulic pressure, so that the one-way slip is always radially expanded and anchored on the small casing, and the rubber sleeve is in an expanded working state.

[0065] The piston 8 is a sleeve structure with a stepped hole formed in the middle. The large diameter end of the stepped hole is sleeved on the outside of the conical sealing sleeve 7. The two are fixed by multiple No. II shear pins 801 evenly distributed along the circumference, and a No. V sealing ring 703 is provided between the inner wall of the large diameter end of the stepped hole of the piston 8 and the conical sealing sleeve 7; a No. VI sealing ring 802 is provided between the inner wall of the piston 8 and the outer wall of the center tube 9; the large diameter end of the stepped hole of the piston 8 is connected with the hydraulic channel 901 of the center tube 9 through the No. II pressure transmission channel 905, and the hydraulic pressure pushes the shear pin of the piston 8 through the No. II pressure transmission channel, and the rubber cylinder 16 is compressed and sealed.

[0066] The outer wall of the middle and lower end of the central tube 9 forms a positioning convex ring 906, and the rubber tube 16 is placed between the positioning convex ring 906 and the piston 8, and the end surface of the hydraulic control pipeline protection tube 14 is in close contact with the end surface of the positioning convex ring 906;

[0067] The outer wall of the lower end of the central tube 9 forms a two-step longitudinal step 907, and the vertical distance from the first step plane of the longitudinal step 907 to the central axis is smaller than the vertical distance from the second step plane to the central axis; the first step plane of the longitudinal step 907 extends to the end face of the positioning convex ring 906; the first step plane of the longitudinal step 907 forms a threading hole 908, the threading hole 908 is connected to the cable channel 902 of the central tube 9, and the threading hole 908 is inclined; the combined design of the inclined threading hole 908 and the two-step longitudinal step realizes an S-shaped passage when the cable 15 passes through the central tube 9; a cable shield 18 is arranged above the second step plane of the longitudinal step 907, and the cable shield 18 is fixed to the central tube 9 by fixing screws 17; the cable shield 18 realizes the fixation of the cable 15;

[0068] A cable channel 902 is formed in the middle of the central tube 9, which is concentric with the central tube. An oil production channel 903 and a hydraulic channel 901 are formed outside the cable channel 902. The hydraulic channel 901, the cable channel 902 and the oil production channel 903 are not connected to each other, are independent of each other, and do not affect each other. The cross section of the oil production channel 903 is C-shaped. A hydraulic plug 11 is provided at one end of the hydraulic channel 901, and a ferrule-type connector 12 is provided at the other end.

[0069] The outer wall of the central tube 9 forms a pressure transmission channel No. Ⅰ 904 and a pressure transmission channel No. Ⅱ 905 arranged radially, and both the pressure transmission channel No. Ⅰ 904 and the pressure transmission channel No. Ⅱ 905 are connected to the hydraulic channel 901 .

[0070] The constant pressure rupture mechanism 10 comprises an outer cylinder short section 1001 and a fixing ring 1002, a pressure cap 1003, a rupture disk 1004 and a support tube 1005 which are sequentially arranged inside the outer cylinder short section 1001; the outer cylinder short section 1001 is a sleeve structure; the fixing ring 1002 is a sleeve structure, and the outer wall of the fixing ring 1002 is threadedly connected to the inner wall of the outer cylinder short section 1001; the fixing ring 1002 is used to fix the pressure cap, the rupture disk and the support tube which are welded together; the pressure cap 1003 is a sleeve structure; the rupture disk 1004 is composed of an intermediate spherical surface and a circular surface connected to the edge of the spherical surface. The two ends of the circular ring of the rupture disk 1004 are respectively welded and fixed to the pressure cap 1003 and the support tube 1005; the outer wall of the support tube 1005 forms an annular groove, and a constant-pressure rupture sealing ring 1006 is arranged in the groove; the setting of the constant-pressure rupture sealing ring 1006 prevents the liquid in the hydraulic control pipeline from leaking downward into the wellbore; after the pipe string is lowered into place, the rupture disk 1004 must be ruptured by a certain pressure to realize the pressure transmission in the hydraulic control pipeline, so as to prevent the premature sealing of the packer due to the pressure difference between the static pressure in the hydraulic control pipeline and the pressure of the well fluid during the lowering of the packer.

[0071] The hydraulic control pipeline protection tube 14 is fixed to the central tube 9 by screws to prevent slipping; a cable passage 141 is arranged at the end of the hydraulic control pipeline protection tube 14 to facilitate the cable to pass through without damage and be connected to the submersible motor.

[0072] The hydraulic control pipeline protection tube 14 and the cable shield 18 are used to prevent the hydraulic control pipeline and the power cable from being directly contacted with the straight wellbore during the lowering process and being scratched and damaged. The cable shield is fixed to the central pipe by screws to prevent it from slipping. The hydraulic control pipeline protection tube is respectively provided with a channel for passing the cable, so that the cable can be connected to the submersible motor after passing through without damage.

[0073] The outlet end 1301 of the hydraulic control line elastic joint 13 is connected to the hydraulic control interface at the lower end of the central pipe 9 through the ferrule joint 12 to realize hydraulic setting and unsealing of the packer;

[0074] The hydraulic control pipeline elastic joint 13 is wound in a spiral shape, and the inlet end 1302 passes through the center of the spiral. The spiral design of the hydraulic control pipeline elastic joint 13 can achieve axial expansion and contraction. The outlet end 1301 of the hydraulic control pipeline elastic joint 13 has a certain inclination angle, so that it is easy to connect with the hydraulic control interface of the central tube 9 with the same inclination angle; the center line of the outlet end 1301 and the inlet end 1302 of the hydraulic control pipeline elastic joint 13 is on the same plane as the center line of the central tube 9, which facilitates the upper part of the hydraulic control pipeline elastic joint 13 to smoothly and concentrically pass through the central tube 9.

[0075] The method of using the present invention:

[0076] As attached Fig.13 As shown, in the cable casting and fishing electric pump unit process, a small casing e is provided in the completion casing f of the original wellbore, the integrated cable a is fixedly connected to the bridle b, the lower end of the bridle b is connected to the lifting short circuit of the concentric penetration type packer c by threads, the lower end of the central pipe of the concentric penetration type packer c is connected to the submersible electric pump unit d by threads, and the power cable and hydraulic control pipeline of the integrated cable a are respectively connected to the lower end power cable and the constant pressure fracturing device inside the packer.

[0077] Before the operation, the integrated cable enters from the upper end of the lifting short section, passes through the middle cable and hydraulic control pipeline channel of the center tube of the packer, reaches the lower side of the packer and extends out, the hydraulic pipeline is separated and connected to the center tube of the packer, the hydraulic control pipeline protection tube and cable shield are installed to fix and protect the power cable and hydraulic control pipeline, the hydraulic plug is installed to form a hydraulic channel, the lower end of the center tube of the packer is connected to the submersible electric pump unit, the produced fluid enters the oil production channel in the packer from the oil pipe below the packer, and is sent to the casing annulus formed by the packer above, and then transported to the wellhead.

[0078] During the well completion process, when the cable-casting and fishing electric pump technology is used for production, there is no need to use the well repair rig equipment. Since there is no oil pipe connection at the upper end of the electric pump, a small casing string needs to be lowered into the wellbore to provide a channel for the produced fluid. In order to prevent the produced fluid from flowing back to the bottom of the well, a packer needs to be connected above the electric pump to isolate the produced fluid and the well fluid, and provide a sitting force for the entire electric pump unit.

[0079] An integrated cable composed of a power cable and a hydraulic control pipeline passes through the tool concentrically and is connected to an electric pump. A hydraulic control pipeline is separated and connected to the sealing channel of the packer. After the cable is deployed into place for the packer and the electric pump, hydraulic pressure is pumped in to make the lower cone push the one-way slip to open, providing a one-way downward seating force for the entire electric pump unit.

[0080] During the production process, the hydraulic pipeline continuously provides hydraulic pressure to keep the packer anchored and isolated.

[0081] When recovering the packer, the hydraulic pressure is unloaded, the rubber cylinder is recovered, the one-way slip is retracted, and the integrated cable is pulled up to recover the packer.

[0082] The center tube of the concentric through-type packer is designed with a C-shaped oil production channel, a cable inner through-channel and an independent hydraulic channel; the hydraulic pressure moves the piston and the rubber cylinder is set to seal the small casing annulus;

[0083] The concentric through-type packer is lowered in one trip through the integrated cable along with the cable-casting electric pump unit. When it reaches the designated position, the hydraulic control line is pressurized to a certain pressure value to rupture the rupture disk, and the pressure is continued to seal and anchor the packer, thereby realizing oil production by the submersible electric pump. After the operation or when waiting for well repair, the pressure of the hydraulic control line drops to zero, and the integrated cable is lifted to complete the recovery of the concentric through-type packer and the entire electric pump unit.

[0084] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0085] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0086] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A concentric penetration packer for a cable-cast electric pump production well, characterized in that: The invention comprises a central tube (9), the two ends of which are respectively connected to a lifting nipple (1) and a hydraulic control line protection cylinder (14); a pressure ring (2), a mud retaining ring (3), an upper cone (4), a lower cone (6), a cone sealing sleeve (7), a piston (8) and a rubber cylinder (16) are sequentially sleeved on the outside of the central tube (9) between the lifting nipple (1) and the hydraulic control line protection cylinder (14); a plurality of one-way slips (5) are evenly distributed along the circumference between the upper cone (4) and the lower cone (6); the central tube (5) located inside the hydraulic control line protection cylinder (14) 9) is provided with a hydraulic control pipeline elastic joint (13) on the outside, one end of the elastic joint (13) is connected to the hydraulic channel (901) of the central tube (9) through a sleeve joint (12), and the other end extends into the cable channel (902) of the central tube (9), and is connected to the hydraulic control pipeline (19) through a constant pressure rupture mechanism (10); one end of the power cable (15) penetrates into the cable channel (902) of the central tube (9) from the outer wall of the central tube (9) located in the hydraulic control pipeline protection tube (14), and the other end extends from the lifting short section (1).

2. The concentric penetration type packer for cable casting and catching electric pump production well according to claim 1 is characterized in that: The lifting nipple (1) and the center pipe (9) are connected by threads, and a No. I sealing ring (102) is arranged between the inner wall of the lifting nipple (1) and the outer wall of the center pipe (9); a plurality of oil production holes (101) are evenly distributed on the outer wall of the connection end between the lifting nipple (1) and the center pipe (9), and the oil production holes (101) are arranged below the No. I sealing ring (102), and the oil production holes (101) are connected to the annular oil production channel (93) of the center pipe (9); the pressure ring (2) and the center pipe ( 9) are fixed by a plurality of No. Ⅰ fixing pins (201) arranged along the circumferential direction, a stepped through hole is formed in the middle of the pressure ring (2), and the large-diameter end of the stepped through hole is sleeved on the outside of the mud guard ring (3); the mud guard ring (3) is a sleeve structure, and a plurality of annular mud guard convex strips (301) are evenly arranged on the outer wall along the axial direction, and the cross section of the mud guard convex strip (301) is trapezoidal; a plurality of drag reduction holes (302) are evenly distributed along the circumference on the mud guard convex strip (301), and the drag reduction holes (302) are opened along the axial direction.

3. The concentric penetration type packer for cable casting and fishing electric pump production well according to claim 1 is characterized in that: The upper cone (4) is connected to the central tube (9) by means of threads; the upper cone (4) is a sleeve-type structure, and the end surface of the mud guard ring forms a mud guard ring fixing groove, and the mud guard ring (3) is inserted into the mud guard ring fixing groove; the outer wall of the upper cone (4) is evenly distributed along the circumference with a plurality of slip grooves (401) for installing a one-way slip (5), and the groove bottom of the slip groove (401) is an inclined surface.

4. The concentric penetration type packer for cable casting and fishing electric pump production well according to claim 1 is characterized in that: The one-way slip (5) is a one-way slip that can only be anchored downward. As can be seen from Figure 1, the slip teeth are inclined downward. When moving downward, there is resistance, but when moving upward, there is no resistance. When the one-way slip (5) is subjected to an upward unsealing force, the packer can be smoothly moved upward; it is limited by the upper cone 4 and the lower cone 6.

5. The concentric penetration type packer for cable casting and catching electric pump production well according to claim 1 is characterized in that: The lower cone (6) is a sleeve structure, and a plurality of slip installation grooves (601) are evenly distributed along the circumference on the end surface of the slip valve; the lower end of the one-way slip valve (5) is inserted into the slip installation groove (601); a stepped through hole is formed in the middle of the lower cone (6), the small diameter end of the stepped through hole is threadedly connected to the center tube (9), and a No. II sealing ring (603) is arranged between the two, and the large diameter end of the stepped through hole is sleeved on the outside of the cone sealing sleeve (7), and the lower cone (6) and the cone sealing sleeve (7) are fixed by a plurality of No. I shear pins (602) evenly distributed along the circumference.

6. The concentric penetration type packer for cable casting and fishing electric pump production well according to claim 1 is characterized in that: The cone sealing sleeve (7) is threadedly connected to the center tube (9); the cone sealing sleeve (7) is a sleeve structure, with a convex ring formed on the middle outer wall; the cone sealing sleeve (7) above the convex ring is inserted into the stepped hole of the lower cone (6), and a No. III sealing ring (701) is arranged between the cone sealing sleeve (7) and the lower cone (6), and a No. IV sealing ring (702) is arranged between the cone sealing sleeve (7) and the center tube (9); the cone sealing sleeve (7) below the convex ring is inserted into the piston (8), and a No. V sealing ring (703) is arranged between the cone sealing sleeve (7) and the piston (8); a hydraulic ring groove (704) is formed on the inner wall of the cone sealing sleeve (7) above the No. IV sealing ring (702), and the hydraulic ring groove (704) is connected to the hydraulic channel (901) of the center tube (9) through a No. I pressure transmission channel (904).

7. The concentric penetration type packer for cable casting and fishing electric pump production well according to claim 1 is characterized in that: The piston (8) is a sleeve structure with a stepped hole formed in the middle. The large diameter end of the stepped hole is sleeved on the outside of the conical sealing sleeve (7). The two are fixed by a plurality of No. II shear pins (801) evenly distributed along the circumference. A No. V sealing ring (703) is provided between the inner wall of the large diameter end of the stepped hole of the piston (8) and the conical sealing sleeve (7); a No. VI sealing ring (802) is provided between the inner wall of the piston (8) and the outer wall of the center tube (9); and the large diameter end of the stepped hole of the piston (8) is connected to the hydraulic channel (901) of the center tube (9) through a No. II pressure transmission channel (905).

8. The concentric penetration type packer for cable casting and catching electric pump production well according to claim 1 is characterized in that: The outer wall of the middle and lower ends of the central tube (9) forms a positioning convex ring (906), the rubber tube (16) is placed between the positioning convex ring (906) and the piston (8), and the end surface of the hydraulic control pipeline protection tube (14) is in close contact with the end surface of the positioning convex ring (906); The outer wall of the lower end of the central tube (9) forms a two-step longitudinal step (907), and the vertical distance from the first step plane of the longitudinal step (907) to the central axis is smaller than the vertical distance from the second step plane to the central axis; the first step plane of the longitudinal step (907) extends to the end face of the positioning convex ring (906); the first step plane of the longitudinal step (907) forms a threading hole (908), the threading hole (908) is connected to the cable channel (902) of the central tube (9), and the threading hole (908) is inclined; the combined design of the inclined threading hole (908) and the two-step longitudinal step enables the cable (15) to pass through the central tube (9) in an S-shaped manner; a cable shield (18) is arranged above the second step plane of the longitudinal step (907); A cable channel (902) is formed in the middle of the central tube (9) and is arranged concentrically with the central tube. An oil production channel (903) and a hydraulic channel (901) are formed outside the cable channel (902); the cross section of the oil production channel (903) is C-shaped; a hydraulic plug (11) is arranged at one end of the hydraulic channel (901), and a ferrule-type connector (12) is arranged at the other end; The outer wall of the central tube (9) forms a pressure transmission channel No. Ⅰ (904) and a pressure transmission channel No. Ⅱ (905) arranged radially, and both the pressure transmission channel No. Ⅰ (904) and the pressure transmission channel No. Ⅱ (905) are connected to the hydraulic channel (901).

9. The concentric penetration type packer for cable casting and catching electric pump production well according to claim 1, characterized in that: The constant-pressure rupture mechanism (10) comprises an outer cylinder short section (1001), and a fixing ring (1002), a pressure cap (1003), a rupture disk (1004) and a support tube (1005) which are sequentially arranged inside the outer cylinder short section (1001); the outer cylinder short section (1001) is a sleeve structure; the fixing ring (1002) is a sleeve structure, and the outer wall of the fixing ring (1002) is threadedly connected to the inner wall of the outer cylinder short section (1001); the pressure cap (1003) is a sleeve structure; the rupture disk (1004) is a disk-mounted structure consisting of an intermediate spherical surface and a circular ring connected to the edge of the spherical surface, and the two ends of the circular ring of the rupture disk (1004) are respectively welded and fixed to the pressure cap (1003) and the support tube (1005); the outer wall of the support tube (1005) forms an annular groove, and a constant-pressure rupture sealing ring (1006) is arranged in the groove.

10. The concentric penetration packer for cable casting and catching electric pump production well according to claim 1, characterized in that: The outlet end (1301) of the hydraulic control pipeline elastic joint (13) is connected to the hydraulic control interface at the lower end of the central tube (9) via a ferrule joint (12); the hydraulic control pipeline elastic joint (13) is wound in a spiral shape, and the inlet end (1302) passes through the center of the spiral. The spiral design of the hydraulic control pipeline elastic joint (13) can achieve axial expansion and contraction, and the outlet end (1301) of the hydraulic control pipeline elastic joint (13) is inclined.

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