Open hole packer for fracturing

Abstract

The open hole packer for fracturing comprises a protruding tooth upper mandrel, a setting pin, a semicircular setting clamp spring, a setting hydraulic cylinder, a sealing ring, an upper outburst prevention ring, a setting rubber barrel, an unsetting pin, a lower outburst prevention ring, a semicircular unsetting sliding block, a sliding block sleeve, a claw barrel, an unsetting rubber barrel, an unsetting rubber barrel baffle ring, a baffle block, a fixed baffle ring, a working lower mandrel and a setting ball. When the packer is set, after a setting ball is put into a tubular column, fluid pressure is increased, fluid enters a setting hydraulic cylinder through a pressure transmission hole, when the pressure in the setting hydraulic cylinder reaches a certain value, a setting pin is cut off, the setting hydraulic cylinder pushes an upper outburst prevention ring to move downwards and extrudes a setting rubber barrel, and the setting rubber barrel is expanded in the radial direction to seal an annular gap to achieve setting; when the packer is unsealed, the fluid pressure is increased to a certain value, the claw cylinder cuts off the unsealing pin, the setting rubber cylinder is axially and downwards recovered under the action of the restoring force, and the packer is unsealed.

Description

Technical Field

[0001] This invention relates to a tool and method for oil well operations, and particularly to an open-hole packer for fracturing. Background Technology

[0002] In multi-stage horizontal well fracturing, the fracturing operation of each stage is independent and does not interfere with each other. Multi-stage fracturing operations ensure the maximum development of the fracture network in each layer by applying pressure stage by stage, thereby significantly improving the production capacity of oil and gas wells. The core of staged pressure is to separate well sections requiring different fracturing conditions through packers, sliding sleeves, ball-drop unsealing, etc., and then apply pressure stage by stage to achieve staged fracturing.

[0003] Among downhole equipment, packers are crucial for multi-stage fracturing. In multi-stage fracturing, compression packers are more commonly used than expansion packers due to considerations such as cost, reliability, ease of manufacturing, and extensive operational experience. However, most current compression open-hole packers are permanently set and cannot be unsealed, adding numerous steps to the fracturing process, increasing the overall fracturing operation time, and reducing efficiency. Therefore, it is necessary to design a fracturing open-hole packer, which is of significant practical importance for reducing extraction costs and improving drilling efficiency. Summary of the Invention

[0004] The purpose of this invention is to propose a fracturing open-hole packer, which aims to achieve the unsealing of the compression-type open-hole packer under the setting condition through a novel unsealing method, so as to facilitate subsequent secondary modification.

[0005] The technical solution adopted in this invention is:

[0006] A fracturing open-hole packer includes a toothed upper mandrel, a setting pin, a semi-circular setting spring, a setting hydraulic cylinder, a sealing ring, an upper anti-protrusion ring, a setting rubber sleeve, a release pin, a lower anti-protrusion ring, a semi-circular release slider, a slider sleeve, a claw sleeve, a release rubber sleeve, a release rubber sleeve retaining ring, a stop block, a fixed retaining ring, a working lower mandrel, and a setting ball. The upper end of the toothed upper mandrel and the lower end of the working lower mandrel are respectively connected to an upper sleeve and a lower sleeve; the upper mandrel and the working lower mandrel, as well as the release rubber sleeve retaining ring and the fixed retaining ring, are all threadedly connected; the setting pin is threadedly fixed to the upper end of the setting hydraulic cylinder with its head inserted into the toothed upper mandrel; the setting hydraulic cylinder is fitted outside the toothed upper mandrel; the semi-circular setting spring is located between the toothed upper mandrel and the setting hydraulic cylinder; and the sealing ring is located between the toothed upper mandrel and the setting ball. Between the hydraulic cylinders; the lower end of the setting hydraulic cylinder is sequentially provided with an upper anti-protrusion ring, a setting rubber sleeve, and a lower anti-protrusion ring. The upper anti-protrusion ring is fitted outside the upper mandrel of the protrusion tooth, the setting rubber sleeve is fitted outside the upper mandrel of the protrusion tooth and the lower working mandrel, and the lower anti-protrusion ring is fitted outside the lower working mandrel; the semi-circular unsealing slider and the slider sleeve are both located at the lower end of the lower anti-protrusion ring. The semi-circular unsealing slider is located between the lower working mandrel and the slider sleeve, and the slider sleeve is fitted outside the semi-circular unsealing slider; the claw cylinder is located inside the upper mandrel of the protrusion tooth and the lower working mandrel; the unsealing pin passes radially through the upper mandrel of the protrusion tooth and is inserted into the claw cylinder; the lower end of the semi-circular unsealing slider and the slider sleeve is sequentially provided with an unsealing rubber sleeve, an unsealing rubber sleeve retaining ring, and a fixed retaining ring, and the unsealing rubber sleeve, the unsealing rubber sleeve retaining ring, and the fixed retaining ring are all fitted outside the lower working mandrel; the stop block is located between the lower working mandrel and the fixed retaining ring.

[0007] Furthermore, the upper and lower ends of the compression-type naked-eye packer are both connected to sleeves; the setting and unsetting rubber tubes are both annular rubber tubes; the materials of the setting and unsetting rubber tubes are both rubber or other superelastic materials.

[0008] The upper mandrel with protruding teeth is provided with an upper connector thread, a setting pin groove, an anti-retraction tooth, a sealing groove, a pressure transmission hole, an unsealing pin hole, and a lower connecting thread. The upper connector thread connects to the upper sleeve. The setting pin groove, the anti-retraction tooth, the sealing groove, and the lower connecting thread are all located outside the upper mandrel. The anti-retraction tooth has an inclined surface and a vertical surface. A sealing ring is provided inside the sealing groove. The pressure transmission hole and the unsealing pin hole are both radial through holes and are evenly distributed around the axis of the upper mandrel.

[0009] Furthermore, the upper mandrel of the protruding tooth has a hollow annular through hole inside; the setting pin groove is an annular groove on the outer surface of the upper mandrel of the protruding tooth, and its function is to provide an installation position for the setting pin that passes through the setting pin hole on the setting hydraulic cylinder, thereby restricting the axial movement of the setting hydraulic cylinder.

[0010] The semi-circular setting spring is semi-cylindrical in shape, and there are two semi-circular setting springs. Each semi-circular setting spring is provided with an inner anti-retraction tooth and an outer anti-retraction tooth. The inner anti-retraction tooth is provided with an inner anti-retraction tooth inclined surface and an inner anti-retraction tooth vertical surface. The outer anti-retraction tooth is provided with an outer anti-retraction tooth inclined surface and an outer anti-retraction tooth vertical surface. The inner anti-retraction tooth and the mandrel anti-retraction tooth on the protruding tooth work together.

[0011] Furthermore, the inner and outer anti-retraction teeth on the semi-circular seat circlip interact with the anti-retraction teeth of the mandrel on the protruding tooth and the anti-retraction teeth of the seat hydraulic cylinder, respectively; when the semi-circular seat circlip is installed outside the mandrel on the protruding tooth, there is a gap between the two semi-circular seat circlips.

[0012] The setting hydraulic cylinder is provided with a setting pin hole, a setting hydraulic cylinder anti-retraction tooth, a setting hydraulic cylinder inner shoulder, and a setting hydraulic cylinder sealing groove; the setting pin hole is a radial through hole and is evenly distributed around the axis of the setting hydraulic cylinder; the setting hydraulic cylinder anti-retraction tooth is provided with a setting hydraulic cylinder anti-retraction tooth inclined surface and a setting hydraulic cylinder anti-retraction tooth vertical surface; the setting hydraulic cylinder anti-retraction tooth interacts with the outer anti-retraction tooth; a sealing ring is provided in the setting hydraulic cylinder sealing groove.

[0013] Furthermore, the setting hydraulic cylinder has a step inside, and before the packer sets, the step surface inside the setting hydraulic cylinder is flush with the axis of the pressure transmission hole of the mandrel on the tooth.

[0014] The semi-circular unsealing slider is semi-cylindrical and there are two semi-circular unsealing sliders. The inner wall of each semi-circular unsealing slider is symmetrically provided with two sliders, and the included angle between the two sliders in the circumferential direction is 90°.

[0015] Furthermore, when the semi-circular unsealing slider is installed between the working lower spindle and the slider sleeve, there is a gap between the two semi-circular unsealing sliders.

[0016] The claw cylinder is provided with a claw cylinder unsealing pin hole, a claw, a claw arm, a claw cylinder platform, and an annular groove. The claw cylinder unsealing pin hole is located on the claw and the claw cylinder unsealing pin holes on the claw cylinder are evenly distributed around the claw cylinder axis. The claw is connected to the claw cylinder platform through the claw arm. The slider is inserted into the annular groove. There is a claw gap between the claws.

[0017] Furthermore, the slider of the semi-circular unsealing slider is inserted into the annular groove of the claw cylinder. When the claw cylinder moves axially downward, the semi-circular unsealing slider moves synchronously. When the claws close, their inner diameter is smaller than the diameter of the sealing ball.

[0018] The lower working mandrel is provided with an upper connecting thread, an axial groove, a limiting groove, a diameter-changing rib, and a lower connector thread. The upper connecting thread of the lower working mandrel engages with the lower connecting thread of the upper mandrel of the protruding tooth. The axial grooves are evenly distributed around the axis of the lower working mandrel, and the number of axial grooves is the same as that of the slider, allowing the slider to slide within the axial grooves. The limiting grooves are located outside the lower working mandrel and are evenly distributed around its axis, and the number of limiting grooves is the same as that of the stop blocks. The diameter-changing ribs are evenly distributed around the axis of the lower working mandrel, and the inner diameter formed by the multiple diameter-changing ribs varies along the axis of the lower working mandrel. The lower connector thread connects to the lower sleeve.

[0019] Furthermore, each axial groove is provided with a slider; the minimum inscribed circle diameter of the variable diameter protrusion of the working lower mandrel is smaller than the diameter of the setting ball, and its function is to retract the setting ball.

[0020] When installing the compression-type open-eye packer, the semi-circular setting ring is installed outside the upper mandrel of the toothed protrusion, and the inner anti-retraction tooth engages with the anti-retraction tooth of the upper mandrel. Two sealing rings are installed in the sealing groove of the upper mandrel and the sealing groove of the setting hydraulic cylinder, respectively. The setting hydraulic cylinder is installed outside the upper mandrel and the semi-circular setting ring, and the anti-retraction tooth of the setting hydraulic cylinder engages with the outer anti-retraction tooth. The setting pin is passed through the setting pin hole and inserted into the setting pin groove. A load is applied to the claw arms of the claw cylinder to narrow the gap between the claws until all claws are tightly fitted. The claw cylinder is positioned inside the upper mandrel of the toothed protrusion, and the release pin hole of the claw cylinder is aligned with the release pin hole of the upper mandrel of the toothed protrusion. The release pin is passed through the release pin hole of the upper mandrel of the toothed protrusion. Insert the claw cylinder into the unsealing pin hole, thread the upper mandrel of the protruding tooth to the lower working mandrel, and sequentially install the upper anti-protrusion ring, the setting rubber sleeve, and the lower anti-protrusion ring at the lower end of the setting hydraulic cylinder. The upper anti-protrusion ring is fitted outside the upper mandrel of the protruding tooth, the setting rubber sleeve is fitted outside the upper mandrel of the protruding tooth and the lower working mandrel, and the lower anti-protrusion ring is fitted outside the lower working mandrel. Place two semi-circular unsealing sliders at the lower end of the lower anti-protrusion ring, so that the sliders pass through the axial sliding groove and are inserted into the ring groove. Fit the slider sleeve outside the semi-circular unsealing slider and make the slider sleeve flush with the upper and lower ends of the semi-circular unsealing slider. Sequentially install the unsealing rubber sleeve and the unsealing rubber sleeve retaining ring at the lower end of the semi-circular unsealing slider and the slider sleeve. Install a stop block at the lower end of the unsealing rubber sleeve retaining ring and insert the stop block into the ring. The packer is inserted into the limiting groove, and the fixing retaining ring is placed outside the stop block and the working lower mandrel and threadedly connected to the unsealing rubber sleeve retaining ring. When the packer needs to be set, the setting ball is inserted into the tubing from the wellhead. After the setting ball is positioned on the upper end of the claw cylinder, the fluid pressure is increased. The fluid enters the setting hydraulic cylinder through the pressure transmission hole and acts on the inner shoulder of the setting hydraulic cylinder. When the pressure on the inner shoulder of the setting hydraulic cylinder reaches a certain value, the setting pin is sheared. The setting hydraulic cylinder pushes the upper anti-outburst ring downward. At the same time, the anti-retraction tooth vertical surface of the setting hydraulic cylinder acts on the outer anti-retraction tooth vertical surface, causing the inner anti-retraction tooth inclined surface to slide along the anti-retraction tooth inclined surface of the upper mandrel of the protruding tooth. The semi-circular setting snap ring moves downward synchronously with the setting hydraulic cylinder. Since the claw cylinder is fixed to the protruding tooth by the unsealing pin, the setting ring is set in place. The slider inside the upper mandrel and the working lower mandrel, and on the inner wall of the semi-circular unsealing slider, is inserted into the annular groove. The semi-circular unsealing slider cannot move axially. The setting rubber sleeve is squeezed by the upper anti-protrusion ring and the lower anti-protrusion ring, expands radially, and seals the annular space gap to achieve setting. At the same time, the upper anti-protrusion ring and the lower anti-protrusion ring play a role in protecting the setting rubber sleeve. When the setting hydraulic cylinder retracts, the anti-retraction tooth inclined surface of the setting hydraulic cylinder acts on the outer anti-retraction tooth inclined surface, and the inner anti-retraction tooth vertical surface is blocked by the anti-retraction tooth vertical surface of the upper mandrel of the protruding tooth. The inner anti-retraction tooth and the outer anti-retraction tooth respectively mesh and lock with the anti-retraction tooth of the upper mandrel of the protruding tooth and the anti-retraction tooth of the setting hydraulic cylinder, so that the setting hydraulic cylinder, the upper mandrel of the protruding tooth and the semi-circular setting spring are tightly held to prevent retraction. Therefore, the setting rubber sleeve can be in the setting state for a long time.When the packer needs to be released, the fluid pressure is increased to a certain value. The jaws are compressed and shear the release pin. The pressure pushes the setting ball and jaw cylinder to move axially. Since the jaw cylinder and the semi-circular release slider are connected by a protrusion, the semi-circular release slider and slider sleeve move axially downwards synchronously, compressing the release tube while providing space for the setting tube to recover. After the jaws move axially downwards a certain distance, they fully enter the working lower mandrel. At this time, under the action of the setting ball, the jaw gap between the jaws increases. The setting ball is depressurized by being blocked by the reducing rib inside the jaw cylinder. Under the action of the restoring force, the setting tube continues to recover axially downwards and synchronously pushes the semi-circular release slider and slider sleeve to move axially downwards, compressing the release tube until the restoring force of the setting tube and the release tube are equal. At this time, the setting tube retracts radially, and the packer is released.

[0021] Furthermore, when the packer is set, the setting sleeve contacts the well wall; when the packer is released, the setting sleeve separates from the well wall; before the packer is set, the upper end of the semi-circular setting snap ring is flush with the anti-retraction teeth of the mandrel on the protruding tooth.

[0022] Compared with the prior art, the beneficial effects of the present invention are: the present invention is applicable to open-hole completion and staged fracturing of horizontal wells, and the added unsealing means can facilitate secondary stimulation in the later stage, which has important practical significance for improving drilling and production efficiency and reducing production costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a fracturing open-hole packer according to the present invention;

[0024] Figure 2 for Figure 1 A magnified view of part I in the image;

[0025] Figure 3 for Figure 1 A magnified view of part II in the image;

[0026] Figure 4 for Figure 1 Schematic diagram of AA section in the middle;

[0027] Figure 5 for Figure 1 Schematic diagram of the BB cross section in the middle;

[0028] Figure 6 for Figure 1 Schematic diagram of the CC section in the image;

[0029] Figure 7 for Figure 1 Schematic diagram of the DD cross section in the middle;

[0030] Figure 8This is a schematic diagram of the structure of the upper mandrel of the tooth of a fracturing packer according to the present invention;

[0031] Figure 9 This is another structural schematic diagram of the mandrel on the tooth of a fracturing open-hole packer according to the present invention;

[0032] Figure 10 This is a schematic diagram of the semi-circular seat spring of a fracturing open-hole packer according to the present invention;

[0033] Figure 11 This is another structural schematic diagram of a semi-circular seat spring for a fracturing open-hole packer according to the present invention;

[0034] Figure 12 This is a schematic diagram of the setting hydraulic cylinder of a fracturing open-hole packer according to the present invention;

[0035] Figure 13 This is another structural schematic diagram of the setting hydraulic cylinder of a fracturing open-hole packer according to the present invention;

[0036] Figure 14 This is another structural schematic diagram of the setting hydraulic cylinder of a fracturing open-hole packer according to the present invention;

[0037] Figure 15 This is a schematic diagram of the semi-circular unsealing slider of a fracturing open-hole packer according to the present invention;

[0038] Figure 16 This is a schematic diagram of the claw cylinder of a fracturing packer according to the present invention;

[0039] Figure 17 This is another structural schematic diagram of the claw cylinder of a fracturing open-hole packer according to the present invention;

[0040] Figure 18 This is a schematic diagram of the structure of the fixing retaining ring of a fracturing open-hole packer according to the present invention;

[0041] Figure 19 This is a schematic diagram of the working mandrel of a fracturing open-hole packer according to the present invention;

[0042] Figure 20 This is another structural schematic diagram of the working mandrel of a fracturing open-hole packer according to the present invention;

[0043] Figure 21 A schematic diagram of the structure of a bare-hole packer used for fracturing before setting;

[0044] Figure 22 A schematic diagram of the structure of a bare-hole packer used for fracturing during setting;

[0045] Figure 23A schematic diagram of a bare-hole packer used for fracturing after unsealing;

[0046] In the diagram: 1-Upper mandrel with protruding teeth, 101-Upper connector thread, 102-Setting pin groove, 103-Anti-retraction tooth of upper mandrel with protruding teeth, 103a-Anti-retraction tooth bevel of upper mandrel with protruding teeth, 103b-Anti-retraction tooth vertical surface of upper mandrel with protruding teeth, 104-Sealing groove of upper mandrel with protruding teeth, 105-Pressure transmission hole, 106-Unsealing pin hole of upper mandrel with protruding teeth, 107-Lower connecting thread of upper mandrel with protruding teeth, 2- Setting pin, 3-semi-circular setting ring, 301-inner anti-reverse tooth, 301a-inner anti-reverse tooth bevel, 301b-inner anti-reverse tooth vertical surface, 302-outer anti-reverse tooth, 302a-outer anti-reverse tooth bevel, 302b-outer anti-reverse tooth vertical surface, 4-setting hydraulic cylinder, 401-setting pin hole, 402-setting hydraulic cylinder anti-reverse tooth, 402a-setting hydraulic cylinder anti-reverse tooth bevel, 40 2b-Anti-reverse tooth vertical surface of setting hydraulic cylinder, 403-Inner shoulder of setting hydraulic cylinder, 404-Sealing groove of setting hydraulic cylinder, 5-Sealing ring, 6-Upper anti-protrusion ring, 7-Setting rubber sleeve, 8-Unsealing pin, 9-Lower anti-protrusion ring, 10-Semi-circular unsealing slider, 1001-Slider, 11-Slider sleeve, 12-Claw cylinder, 1201-Unsealing pin hole of claw cylinder, 1202-Claw, 1203-Claw arm, 1204-Claw cylinder platform, 1205-Ring groove, 13-Unsealing rubber sleeve, 14-Unsealing rubber sleeve retaining ring, 15-Stop block, 16-Fixed retaining ring, 17-Working lower spindle, 1701-Connecting thread on working lower spindle, 1702-Axial groove, 1703-Limiting groove, 1704-Different diameter protrusion, 1705-Lower connector thread, 18-Setting ball. Detailed Implementation

[0047] The invention will now be further described with reference to the accompanying drawings.

[0048] Example:

[0049] like Figures 1 to 7As shown, a fracturing open-hole packer includes a toothed upper mandrel 1, a setting pin 2, a semi-circular setting snap ring 3, a setting hydraulic cylinder 4, a sealing ring 5, an upper anti-protrusion ring 6, a setting rubber sleeve 7, a release pin 8, a lower anti-protrusion ring 9, a semi-circular release slider 10, a slider sleeve 11, a claw sleeve 12, a release rubber sleeve 13, a release rubber sleeve retaining ring 14, a stop block 15, a fixing retaining ring 16, a working lower mandrel 17, and a setting ball 18. The upper end of the toothed upper mandrel 1 is connected to the working lower mandrel 17. The lower ends are connected to the upper sleeve and the lower sleeve respectively. The upper mandrel 1 of the protruding tooth and the lower working mandrel 17, the unsealing rubber sleeve retaining ring 14 and the fixed retaining ring 16 are all connected by threads. The setting pin 2 is fixed to the upper end of the setting hydraulic cylinder 4 by threads and the pin head is inserted into the upper mandrel 1 of the protruding tooth. The setting hydraulic cylinder 4 is fitted outside the upper mandrel 1 of the protruding tooth. The semi-circular setting snap ring 3 is located between the upper mandrel 1 of the protruding tooth and the setting hydraulic cylinder 4. The sealing ring 5 is located between the upper mandrel 1 of the protruding tooth and the setting hydraulic cylinder 4. The lower end of the setting hydraulic cylinder 4 is sequentially provided with an upper anti-protrusion ring 6, a setting rubber sleeve 7, and a lower anti-protrusion ring 9. The upper anti-protrusion ring 6 is fitted outside the upper mandrel 1 of the protrusion teeth, the setting rubber sleeve 7 is fitted outside the upper mandrel 1 of the protrusion teeth and the working lower mandrel 17, and the lower anti-protrusion ring 9 is fitted outside the working lower mandrel 17. The semi-circular unsealing slider 10 and the slider sleeve 11 are both located at the lower end of the lower anti-protrusion ring 9. The semi-circular unsealing slider 10 is located between the working lower mandrel 17 and the slider sleeve 11, and the slider sleeve 11 is fitted inside the semi-circular unsealing cylinder. Outside the slider 10; the claw cylinder 12 is located inside the upper spindle 1 of the protruding teeth and the lower working spindle 17; the unsealing pin 8 passes radially through the upper spindle 1 of the protruding teeth and is inserted into the claw cylinder 12; the lower ends of the semi-circular unsealing slider 10 and the slider sleeve 11 are sequentially provided with an unsealing rubber tube 13, an unsealing rubber tube retaining ring 14 and a fixing retaining ring 16, and the unsealing rubber tube 13, the unsealing rubber tube retaining ring 14 and the fixing retaining ring 16 are all fitted outside the lower working spindle 17; the stop block 15 is located between the lower working spindle 17 and the fixing retaining ring 16.

[0050] Furthermore, the upper and lower ends of the compression-type naked eye packer are both connected to sleeves; the setting sleeve 7 and the unsetting sleeve 13 are both annular sleeves; the materials of the setting sleeve 7 and the unsetting sleeve 13 are both rubber or other superelastic materials.

[0051] like Figure 8 and Figure 9As shown, the upper mandrel 1 with protruding teeth is provided with an upper connector thread 101, a setting pin groove 102, an anti-retraction tooth 103, a sealing groove 104, a pressure transmission hole 105, an unsealing pin hole 106, and a lower connecting thread 107; the upper connector thread 101 is connected to the upper sleeve, and the setting pin groove 102, the anti-retraction tooth 103, and the sealing groove are... Both 104 and the lower connecting thread 107 of the upper mandrel of the protruding tooth are located outside the upper mandrel of the protruding tooth 1; the upper mandrel of the protruding tooth anti-retraction tooth 103 is provided with an anti-retraction tooth inclined surface 103a and an anti-retraction tooth vertical surface 103b; the upper mandrel of the protruding tooth sealing groove 104 is provided with a sealing ring 5; the pressure transmission hole 105 and the upper mandrel of the protruding tooth unsealing pin hole 106 are both radial through holes and are evenly distributed around the axis of the upper mandrel of the protruding tooth 1.

[0052] Furthermore, the interior of the upper mandrel 1 of the protruding tooth is a hollow annular through hole; the setting pin groove 102 is an annular groove on the outer surface of the upper mandrel 1 of the protruding tooth, and its function is to provide an installation position for the setting pin 2 that passes through the setting pin hole 401 on the setting hydraulic cylinder 4, thereby restricting the axial movement of the setting hydraulic cylinder 4.

[0053] like Figure 10 and Figure 11 As shown, the semi-circular seat spring 3 is semi-cylindrical in shape and there are two semi-circular seat springs 3. Each semi-circular seat spring 3 is provided with an inner anti-retraction tooth 301 and an outer anti-retraction tooth 302. The inner anti-retraction tooth 301 is provided with an inner anti-retraction tooth inclined surface 301a and an inner anti-retraction tooth vertical surface 301b. The outer anti-retraction tooth 302 is provided with an outer anti-retraction tooth inclined surface 302a and an outer anti-retraction tooth vertical surface 302b. The inner anti-retraction tooth 301 interacts with the anti-retraction tooth 103 on the mandrel of the protruding tooth.

[0054] Furthermore, the inner anti-retraction tooth 301 and the outer anti-retraction tooth 302 on the semi-circular seat circlip 3 interact with the anti-retraction tooth 103 on the upper spindle of the protruding tooth and the anti-retraction tooth 402 on the seat hydraulic cylinder, respectively; when the semi-circular seat circlip 3 is installed outside the upper spindle 1 of the protruding tooth, there is a gap between the two semi-circular seat circlips 3.

[0055] like Figures 12 to 14 As shown, the setting hydraulic cylinder 4 is provided with a setting pin hole 401, a setting hydraulic cylinder anti-retraction tooth 402, a setting hydraulic cylinder inner shoulder 403, and a setting hydraulic cylinder sealing groove 404; the setting pin hole 401 is a radial through hole and is evenly distributed around the axis of the setting hydraulic cylinder 4; the setting hydraulic cylinder anti-retraction tooth 402 is provided with a setting hydraulic cylinder anti-retraction tooth inclined surface 402a and a setting hydraulic cylinder anti-retraction tooth vertical surface 402b; the setting hydraulic cylinder anti-retraction tooth 402 interacts with the outer anti-retraction tooth 302; a sealing ring 5 is provided in the setting hydraulic cylinder sealing groove 404.

[0056] Furthermore, the setting hydraulic cylinder 4 has a step inside. Before the packer sets, the step surface inside the setting hydraulic cylinder 4 is flush with the axis of the pressure transmission hole 105 of the upper spindle 1 of the tooth.

[0057] like Figure 15 As shown, the semi-circular unsealing slider 10 is semi-cylindrical and there are two semi-circular unsealing sliders 10. Each semi-circular unsealing slider 10 has two sliders 1001 symmetrically arranged on its inner wall. The angle between the two sliders 1001 in the circumferential direction is 90°.

[0058] Furthermore, when the semi-circular unsealing slider 10 is installed between the working lower spindle 17 and the slider sleeve 11, there is a gap between the two semi-circular unsealing sliders 10.

[0059] like Figure 16 and Figure 17 As shown, the claw cylinder 12 is provided with a claw cylinder unsealing pin hole 1201, a claw 1202, a claw arm 1203, a claw cylinder platform 1204, and an annular groove 1205. The claw cylinder unsealing pin hole 1201 is provided on the claw 1202, and the claw cylinder unsealing pin holes 1201 on the claw cylinder 12 are evenly distributed around the axis of the claw cylinder 12. The claw 1202 is connected to the claw cylinder platform 1204 through the claw arm 1203. The slider 1001 is inserted into the annular groove 1205. There is a claw gap 1206 between the claws 1202.

[0060] Furthermore, the slider 1001 of the semi-circular unsealing slider 10 is inserted into the annular groove 1205 of the claw cylinder 12. When the claw cylinder 12 moves axially downward, the semi-circular unsealing slider 10 moves synchronously. When the claw 1202 closes, its inner diameter is smaller than the diameter of the sealing ball 18.

[0061] like Figure 19 and Figure 20 As shown, the lower working mandrel 17 is provided with an upper working mandrel connecting thread 1701, an axial sliding groove 1702, a limiting groove 1703, a diameter-changing protrusion 1704, and a lower connector thread 1705. The upper working mandrel connecting thread 1701 engages with the lower connecting thread 107 of the upper mandrel of the protruding tooth. The axial sliding groove 1702 is evenly distributed around the axis of the lower working mandrel 17, and the number of axial sliding grooves 1702 is the same as that of the slider 1001, which can slide within the axial sliding groove 1702. The limiting groove 1703 is located outside the lower working mandrel 17 and is evenly distributed around the axis of the lower working mandrel 17, and the number of limiting grooves 1703 is the same as that of the stop block 15. The diameter-changing protrusion 1704 is evenly distributed around the axis of the lower working mandrel 17, and the inner diameter formed by the multiple diameter-changing protrusions 1704 varies along the axis of the lower working mandrel 17. The lower connector thread 1705 is connected to the lower sleeve.

[0062] Furthermore, each axial groove 1702 is provided with a slider 1001; the minimum inscribed circle diameter of the variable diameter protrusion 1704 of the working lower spindle 17 is smaller than the diameter of the setting ball 18, and its function is to retract the setting ball 18.

[0063] like Figures 1 to 23As shown, when the compression-type open-eye packer is installed, the semi-circular setting ring 3 is installed outside the upper spindle 1 of the toothed protrusion, and the inner anti-retraction tooth 301 engages with the anti-retraction tooth 103 of the upper spindle of the toothed protrusion. Two sealing rings 5 ​​are installed in the sealing groove 104 of the upper spindle of the toothed protrusion and the sealing groove 404 of the setting hydraulic cylinder, respectively. The setting hydraulic cylinder 4 is installed outside the upper spindle 1 of the toothed protrusion and the semi-circular setting ring 3, and the anti-retraction tooth 402 of the setting hydraulic cylinder engages with the outer anti-retraction tooth 302. The setting pin 2 is then inserted... The jaw cylinder 12 is inserted through the setting pin hole 401 and into the setting pin groove 102. A load is applied to the jaw arms 1203 of the jaw cylinder 12 to narrow the jaw gap 1206 between the jaws 1202 until each jaw 1202 is tightly engaged. The jaw cylinder 12 is then positioned inside the upper mandrel 1 of the tooth, and the jaw cylinder's release pin hole 1201 is aligned with the release pin hole 106 of the upper mandrel. The release pin 8 is passed through the release pin hole 106 of the upper mandrel and inserted into the jaw cylinder's release pin hole 1201. The upper mandrel... Shaft 1 is threadedly connected to the lower working spindle 17. The lower end of the setting hydraulic cylinder 4 is sequentially equipped with an upper anti-protrusion ring 6, a setting rubber sleeve 7, and a lower anti-protrusion ring 9. The upper anti-protrusion ring 6 is fitted onto the upper spindle 1 of the protrusion teeth, the setting rubber sleeve 7 is fitted onto the upper spindle 1 of the protrusion teeth and the lower working spindle 17, and the lower anti-protrusion ring 9 is fitted onto the lower working spindle 17. Two semi-circular unsealing sliders 10 are positioned at the lower end of the lower anti-protrusion ring 9, allowing the sliders 1001 to pass through the axial groove 1702 and insert into the annular groove 1205. The slider sleeve 11 is fitted onto the semi-circular unsealing slider 10 and is flush with the upper and lower ends of the semi-circular unsealing slider 10. Unsealing tube 13 and unsealing tube retaining ring 14 are sequentially arranged at the lower ends of the semi-circular unsealing slider 10 and the slider sleeve 11. A stop block 15 is arranged at the lower end of the unsealing tube retaining ring 14 and the stop block 15 is inserted into the limiting groove 1703. The fixing retaining ring 16 is arranged outside the stop block 15 and the working lower spindle 17 and is threadedly connected to the unsealing tube retaining ring 14.When the packer needs to be set, the setting ball 18 is inserted into the tubing from the wellhead. After the setting ball 18 is positioned on the upper end of the claw cylinder 12, the fluid pressure is increased. The fluid enters the setting hydraulic cylinder 4 through the pressure transmission hole 105 and acts on the inner shoulder 403 of the setting hydraulic cylinder. When the pressure on the inner shoulder 403 of the setting hydraulic cylinder reaches a certain value, the setting pin 2 is sheared. The setting hydraulic cylinder 4 pushes the upper anti-outburst ring 6 downward. At the same time, the anti-outburst tooth vertical surface 402b of the setting hydraulic cylinder acts on the outer anti-outburst tooth vertical surface 302b, causing the inner anti-outburst tooth inclined surface 301a to slide along the anti-outburst tooth inclined surface 103a of the upper mandrel of the protruding tooth. The semi-circular setting snap ring 3 moves downward synchronously with the setting hydraulic cylinder 4. Because the claw cylinder 12 is fixed inside the upper spindle 1 and the lower spindle 17 of the protruding tooth by the unsealing pin 8, and the slider 1001 on the inner wall of the semi-circular unsealing slider 10 is inserted into the annular groove 1205, the semi-circular unsealing slider 10 cannot move axially. The setting rubber cylinder 7 is squeezed by the upper anti-protrusion ring 6 and the lower anti-protrusion ring 9 and expands radially to seal the annular space gap to achieve setting. At the same time, the upper anti-protrusion ring 6 and the lower anti-protrusion ring 9 play a role in protecting the setting rubber cylinder 7. When the setting hydraulic cylinder 4 retracts, the anti-retraction tooth inclined surface 402a of the setting hydraulic cylinder acts on the outer anti-retraction tooth inclined surface 302a, and the inner anti-retraction tooth vertical surface 301b is blocked by the anti-retraction tooth vertical surface 103b of the upper spindle of the protruding tooth. 301 and the outer anti-retraction tooth 302 respectively engage and lock with the anti-retraction tooth 103 on the upper spindle of the protruding tooth and the anti-retraction tooth 402 of the setting hydraulic cylinder, so that the setting hydraulic cylinder 4, the upper spindle of the protruding tooth 1 and the semi-circular setting spring 3 are tightly held to prevent retraction, so the setting rubber sleeve 7 can be in the setting state for a long time; when it is necessary to release the packer, the fluid pressure is further increased to a certain value, the pawl 1202 is pressurized and shears the release pin 8, the pressure pushes the setting ball 18 and the pawl cylinder 12 to move axially, since the pawl cylinder 12 and the semi-circular release slider 10 are connected by the protrusion 1001, the semi-circular release slider 10 and the slider sleeve 11 move axially downward synchronously and squeeze the release rubber sleeve 1 Simultaneously, space is provided for the recovery of the setting sleeve 7; after the jaws 1202 move axially downward a certain distance, they fully enter the working lower spindle 17. At this time, under the action of the setting ball 18, the jaw gap 1206 between the jaws 1202 increases. The setting ball 18 passes through the inside of the jaw sleeve 12 and is blocked by the reducing rib 1704, thus achieving pressure relief. Under the action of the restoring force, the setting sleeve 7 continues to recover axially downward and simultaneously pushes the semi-circular unsealing slider 10 and the slider sleeve 11 to move axially downward, compressing the unsealing sleeve 13 until the restoring force of the setting sleeve 7 and the restoring force of the unsealing sleeve 13 are equal. At this time, the setting sleeve 7 retracts radially, and the packer is unsealed.

[0064] Furthermore, when the packer is set, the setting sleeve 7 contacts the well wall; when the packer is unsealed, the setting sleeve 7 separates from the well wall; before the packer is set, the upper end of the semi-circular setting snap ring 3 is flush with the anti-retraction tooth 103 on the upper mandrel of the protruding tooth.

[0065] The specific embodiments described above are for illustrative purposes only and are not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the invention are within the protection scope of the invention.

Claims

1. A fracturing open-hole packer, comprising a toothed upper mandrel (1), a setting pin (2), a semi-circular setting retaining ring (3), a setting hydraulic cylinder (4), a sealing ring (5), an upper anti-protrusion ring (6), a setting rubber sleeve (7), a release pin (8), a lower anti-protrusion ring (9), a semi-circular release slider (10), a slider sleeve (11), a claw sleeve (12), a release rubber sleeve (13), a release rubber sleeve retaining ring (14), a stop block (15), a fixed retaining ring (16), a working lower mandrel (17), and a setting ball (18), characterized in that... The upper end of the upper mandrel (1) and the lower end of the lower working mandrel (17) are respectively connected to the upper sleeve and the lower sleeve. The upper mandrel (1) and the lower working mandrel (17), the unsealing rubber sleeve retaining ring (14) and the fixing retaining ring (16) are all connected by threads. The setting pin (2) is fixed to the upper end of the setting hydraulic cylinder (4) by threads and the pin head is inserted into the upper mandrel (1). The setting hydraulic cylinder (4) is fitted outside the upper mandrel (1). The semi-circular setting ring (3) is located between the upper spindle (1) of the toothed protrusion and the setting hydraulic cylinder (4); the sealing ring (5) is located between the upper spindle (1) of the toothed protrusion and the setting hydraulic cylinder (4); the lower end of the setting hydraulic cylinder (4) is provided with an upper anti-protrusion ring (6), a setting rubber sleeve (7) and a lower anti-protrusion ring (9) in sequence. The upper anti-protrusion ring (6) is fitted outside the upper spindle (1) of the toothed protrusion, and the setting rubber sleeve (7) is fitted outside the upper spindle (1) of the toothed protrusion and the lower working spindle (17). The lower anti-protrusion ring (9) is fitted outside the working lower mandrel (17); the semi-circular unsealing slider (10) and the slider sleeve (11) are both located at the lower end of the lower anti-protrusion ring (9), the semi-circular unsealing slider (10) is located between the working lower mandrel (17) and the slider sleeve (11), and the slider sleeve (11) is fitted outside the semi-circular unsealing slider (10); the claw sleeve (12) is located inside the upper mandrel (1) and the working lower mandrel (17); the unsealing pin (8) The radially protruding upper spindle (1) is inserted into the claw cylinder (12); the lower ends of the semi-circular unsealing slider (10) and slider sleeve (11) are provided with unsealing rubber tube (13), unsealing rubber tube retaining ring (14) and fixed retaining ring (16) in sequence, and the unsealing rubber tube (13), unsealing rubber tube retaining ring (14) and fixed retaining ring (16) are all fitted outside the working lower spindle (17); the stop block (15) is located between the working lower spindle (17) and the fixed retaining ring (16).

2. The open-hole packer for fracturing according to claim 1, characterized in that: The upper mandrel (1) of the protruding tooth is provided with an upper connector thread (101), a setting pin groove (102), an anti-retraction tooth (103), a sealing groove (104), a pressure transmission hole (105), an unsealing pin hole (106), and a lower connecting thread (107); the upper connector thread (101) is connected to the upper sleeve, and the setting pin groove (102), the anti-retraction tooth (103), the sealing groove (104), the pressure transmission hole (105), the unsealing pin hole (106), and the lower connecting thread (107) of the upper mandrel are provided. Both the threaded connection (104) and the threaded connection (107) of the upper mandrel of the protruding tooth are located outside the upper mandrel of the protruding tooth (1); the anti-retraction tooth (103) of the upper mandrel of the protruding tooth is provided with an anti-retraction tooth inclined surface (103a) and an anti-retraction tooth vertical surface (103b); a sealing ring (5) is provided in the sealing groove (104) of the upper mandrel of the protruding tooth; the pressure transmission hole (105) and the unsealing pin hole (106) of the upper mandrel of the protruding tooth are both radial through holes and are evenly distributed around the axis of the upper mandrel of the protruding tooth (1).

3. A fracturing open-hole packer according to claim 1, characterized in that: The semi-circular seated retaining ring (3) is semi-cylindrical and there are two semi-circular seated retaining rings (3). Each semi-circular seated retaining ring (3) is provided with an inner anti-retraction tooth (301) and an outer anti-retraction tooth (302). The inner anti-retraction tooth (301) is provided with an inner anti-retraction tooth inclined surface (301a) and an inner anti-retraction tooth vertical surface (301b). The outer anti-retraction tooth (302) is provided with an outer anti-retraction tooth inclined surface (302a) and an outer anti-retraction tooth vertical surface (302b). The inner anti-retraction tooth (301) interacts with the anti-retraction tooth (103) on the mandrel of the protruding tooth.

4. A fracturing open-hole packer according to claim 1, characterized in that: The setting hydraulic cylinder (4) is provided with a setting pin hole (401), a setting hydraulic cylinder anti-retraction tooth (402), a setting hydraulic cylinder inner shoulder (403), and a setting hydraulic cylinder sealing groove (404); the setting pin hole (401) is a radial through hole and is evenly distributed around the axis of the setting hydraulic cylinder (4); the setting hydraulic cylinder anti-retraction tooth (402) is provided with a setting hydraulic cylinder anti-retraction tooth inclined surface (402a) and a setting hydraulic cylinder anti-retraction tooth vertical surface (402b); the setting hydraulic cylinder anti-retraction tooth (402) interacts with the outer anti-retraction tooth (302); a sealing ring (5) is provided in the setting hydraulic cylinder sealing groove (404).

5. A fracturing open-hole packer according to claim 1, characterized in that: The semi-circular unsealing slider (10) is semi-cylindrical and there are two semi-circular unsealing sliders (10). Each semi-circular unsealing slider (10) has two sliders (1001) symmetrically arranged on its inner wall. The angle between the two sliders (1001) in the circumferential direction is 90°.

6. A fracturing open-hole packer according to claim 1, characterized in that: The claw cylinder (12) is provided with a claw cylinder unsealing pin hole (1201), a claw (1202), a claw arm (1203), a claw cylinder platform (1204), and an annular groove (1205). The claw cylinder unsealing pin hole (1201) is provided on the claw (1202), and the claw cylinder unsealing pin holes (1201) on the claw cylinder (12) are evenly distributed around the axis of the claw cylinder (12). The claw (1202) is connected to the claw cylinder platform (1204) through the claw arm (1203). The slider (1001) is inserted into the annular groove (1205). There is a claw gap (1206) between the claws (1202).

7. A fracturing open-hole packer according to claim 1, characterized in that: The lower working mandrel (17) is provided with an upper working mandrel connecting thread (1701), an axial groove (1702), a limiting groove (1703), a reducing rib (1704), and a lower connector thread (1705). The upper working mandrel connecting thread (1701) mates with the lower connecting thread (107) of the upper mandrel of the protruding tooth. The axial groove (1702) is evenly distributed around the axis of the lower working mandrel (17), and the number of axial grooves (1702) is the same as that of the slider (1001). 001) It can slide in the axial groove (1702); the limiting groove (1703) is located outside the working lower spindle (17) and is evenly distributed around the axis of the working lower spindle (17), and the number of limiting grooves (1703) is the same as that of the stop block (15); the variable diameter protrusion (1704) is evenly distributed around the axis of the working lower spindle (17), and the inner diameter formed by multiple variable diameter protrusions (1704) varies along the axis of the working lower spindle (17); the lower connector thread (1705) is connected to the lower sleeve.

8. A fracturing open-hole packer according to claim 1, characterized in that: When the compression-type open-eye packer is installed, the semi-circular setting ring (3) is installed outside the upper spindle (1) of the toothed protrusion and the inner anti-retraction tooth (301) is engaged with the anti-retraction tooth (103) of the upper spindle of the toothed protrusion. The two sealing rings (5) are installed in the sealing groove (104) of the upper spindle of the toothed protrusion and the sealing groove (404) of the setting hydraulic cylinder, respectively. The setting hydraulic cylinder (4) is installed outside the upper spindle (1) of the toothed protrusion and the semi-circular setting ring (3) and the anti-retraction tooth (402) of the setting hydraulic cylinder is engaged with the outer anti-retraction tooth (302). The setting pin (2) is passed through the setting pin hole. (401) Insert the sealing pin into the slot (102), apply a load to the jaw arms (1203) of the jaw cylinder (12) to narrow the gap (1206) between the jaws (1202) until each jaw (1202) fits tightly, place the jaw cylinder (12) inside the upper mandrel (1) of the tooth and make the unsealing pin hole (1201) of the jaw cylinder and the unsealing pin hole (106) of the upper mandrel of the tooth, pass the unsealing pin (8) through the unsealing pin hole (106) of the upper mandrel of the tooth and insert it into the unsealing pin hole (1201) of the jaw cylinder, and connect the upper mandrel of the tooth to the working lower mandrel. The shaft (17) is threaded. The lower end of the setting hydraulic cylinder (4) is sequentially equipped with an upper anti-protrusion ring (6), a setting rubber sleeve (7), and a lower anti-protrusion ring (9). The upper anti-protrusion ring (6) is fitted outside the upper mandrel (1) of the protrusion tooth. The setting rubber sleeve (7) is fitted outside the upper mandrel (1) of the protrusion tooth and the lower working mandrel (17). The lower anti-protrusion ring (9) is fitted outside the lower working mandrel (17). Two semi-circular unsealing sliders (10) are set at the lower end of the lower anti-protrusion ring (9), so that the slider (1001) passes through the axial groove (1702) and is inserted into the annular groove (1205). The slider sleeve is then placed. The sleeve (11) is fitted outside the semi-circular unsealing slider (10) and the upper and lower ends of the slider sleeve (11) are flush with the upper and lower ends of the semi-circular unsealing slider (10). Unsealing rubber tube (13) and unsealing rubber tube retaining ring (14) are sequentially set at the lower ends of the semi-circular unsealing slider (10) and the slider sleeve (11). A stop block (15) is set at the lower end of the unsealing rubber tube retaining ring (14) and the stop block (15) is inserted into the limiting groove (1703). The fixing retaining ring (16) is set outside the stop block (15) and the working lower spindle (17) and is threadedly connected to the unsealing rubber tube retaining ring (14).When the packer needs to be set, the setting ball (18) is inserted into the tubing from the wellhead. After the setting ball (18) is positioned on the upper end of the claw cylinder (12), the fluid pressure is increased. The fluid enters the setting hydraulic cylinder (4) through the pressure transmission hole (105) and acts on the inner shoulder (403) of the setting hydraulic cylinder. When the pressure on the inner shoulder (403) of the setting hydraulic cylinder reaches a certain value, the setting pin (2) is sheared. The setting hydraulic cylinder (4) pushes the upper anti-protrusion ring (6) downward. At the same time, the anti-retraction tooth vertical surface (402b) of the setting hydraulic cylinder acts on the outer anti-retraction tooth vertical surface (302b), causing the inner anti-retraction tooth inclined surface (301a) to slide along the anti-retraction tooth inclined surface (103a) of the upper mandrel of the protrusion tooth. The semi-circular setting snap ring (3) moves downward synchronously with the setting hydraulic cylinder (4). The claw cylinder (12) is fixed inside the upper spindle (1) and the working lower spindle (17) of the protruding tooth by the unsealing pin (8), and the slider (1001) on the inner wall of the semi-circular unsealing slider (10) is inserted into the annular groove (1205). The semi-circular unsealing slider (10) cannot move axially. The setting rubber cylinder (7) is squeezed by the upper anti-protrusion ring (6) and the lower anti-protrusion ring (9) and expands radially to seal the annular space gap to achieve setting. At the same time, the upper anti-protrusion ring (6) and the lower anti-protrusion ring (9) play a role in protecting the setting rubber cylinder (7). When the setting hydraulic cylinder (4) retracts, the anti-retraction tooth inclined surface (402a) of the setting hydraulic cylinder acts on the outer anti-retraction tooth inclined surface (302a), and the inner anti-retraction tooth vertical surface (301b) is blocked by the anti-retraction tooth vertical surface (103b) of the upper spindle of the protruding tooth. The tooth (301) and the outer anti-retraction tooth (302) respectively engage and lock with the anti-retraction tooth (103) of the upper spindle of the protruding tooth and the anti-retraction tooth (402) of the setting hydraulic cylinder, so that the setting hydraulic cylinder (4), the upper spindle of the protruding tooth (1) and the semi-circular setting spring (3) are held tightly to prevent retraction, so the setting rubber tube (7) can be in the setting state for a long time; when it is necessary to release the packer, the fluid pressure is increased to a certain value, the pawl (1202) is pressurized and shears the release pin (8), the pressure pushes the setting ball (18) and the pawl cylinder (12) to move axially, since the pawl cylinder (12) and the semi-circular release slider (10) are connected by the protrusion (1001), the semi-circular release slider (10) and the slider sleeve (11) move axially downward synchronously and squeeze the release rubber tube (7). 13) At the same time, it provides space for the recovery of the setting sleeve (7); after the jaws (1202) move axially downward a certain distance, they fully enter the working lower spindle (17). At this time, under the action of the setting ball (18), the jaw gap (1206) between the jaws (1202) increases. The setting ball (18) is blocked by the variable diameter protrusion (1704) from the inside of the jaw sleeve (12) to achieve pressure relief. Under the action of the restoring force, the setting sleeve (7) continues to recover axially downward and simultaneously pushes the semi-circular unsealing slider (10) and the slider sleeve (11) axially downward, compressing the unsealing sleeve (13) until the restoring force of the setting sleeve (7) and the restoring force of the unsealing sleeve (13) are equal. At this time, the setting sleeve (7) retracts radially, and the packer is unsealed.

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