Horizontal butt-salt cavern old well casing reaming device

Abstract

The present application relates to the field of oil and gas resource development, and provides a horizontal butt joint salt cavern old well casing reaming device, which comprises a reaming device body, a cutter feeding rod, a reaming cutter and a connecting rod mechanism. The reaming device body comprises a body center hole extending along an axis and a plurality of openings uniformly distributed in the circumferential direction on the side wall. The cutter feeding rod is slidably arranged in the body center hole along the axis and has a cutter feeding rod center hole coaxial with the body center hole. The reaming cutter is pivotally connected to the reaming device body and is rotatable between a retracted position and an open position extending out of the opening. The connecting rod mechanism connects the reaming cutter to the cutter feeding rod to define an opening angle of the reaming cutter when the reaming cutter is in the open position. The reaming device can improve the reaming efficiency and ensure safe construction.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas resource development and relates to the horizontal docking of salt cavern gas storage facilities with old salt cavern well sealing operations, and a new type of enlargement device used after milling the casing section of the sealing layer. Background Technology

[0002] Existing salt cavern gas storage facilities often suffer from problems such as casing deformation and corrosion, poor cementing quality and sealing conditions, and small well diameter when horizontally connected to old salt cavern wells. These conditions prevent them from being directly converted into injection-production gas wells, necessitating the sealing of these old wells in the area. To ensure the reliability of the sealing, the milled well section can be enlarged to 265 mm to 270 mm, thereby ensuring annular sealing down to the formation and guaranteeing the safe operation of the subsequent gas storage facility.

[0003] Typically, the safe reaming size per operation is 30-50 mm, while in special reaming conditions, the reaming size needs to reach over 90 mm. Furthermore, due to the traditional 7-inch casing diameter limitation, the reamer's cutter body must extend more than 120 mm beyond its main body size, resulting in a large reaming diameter. Large-diameter reaming increases the torque of the reaming tool, affecting the drilling speed and tool life, and easily leading to complex downhole conditions. Additionally, rock salt formations have large, brittle, and easily fractured crystals, making the contact surface unstable and prone to collapse during reaming, causing drill blockage and impacting operational efficiency and downhole safety.

[0004] Currently, the domestic market for eye-expanding tools mainly uses hydraulic expansion mechanisms. However, domestic products can only expand the eye by 30-50 mm per operation, which is insufficient for construction conditions requiring larger eye sizes. Therefore, eye-expanding tools need improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a horizontal docking salt cavern casing enlargement device suitable for large-size enlargement operations, thereby improving enlargement efficiency and ensuring safe construction.

[0006] To solve at least one of the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] According to the present invention, a horizontal docking salt cavern old well casing reaming device is provided, comprising: a reaming device body, including a central hole extending along an axis and having a plurality of openings evenly distributed circumferentially on the sidewall; a cutting rod slidably disposed within the central hole along the axis and having a cutting rod central hole coaxial with the central hole; a reaming cutter, pivotally connected to the reaming device body and rotatable between a retracted position and an open position extending from the openings; and a linkage mechanism connecting the reaming cutter to the cutting rod to limit the opening angle of the reaming cutter when it is in the open position.

[0008] According to one embodiment of the present invention, the eye-expanding device body comprises, in sequence along a first direction parallel to the axis, a first body section and a second body section, the inner diameter of which is smaller than the inner diameter of the first body section; wherein, a first step portion of the body is formed at the junction of the first body section and the second body section.

[0009] According to one embodiment of the present invention, the tool feed bar sequentially comprises along the first direction: a first section of the tool feed bar, the outer diameter of which matches the inner diameter of the first section of the body; a second section of the tool feed bar, the outer diameter of which matches the inner diameter of the second section of the body; and a third section of the tool feed bar, configured to connect to the reamer; wherein, a tool feed bar step portion is formed at the junction of the first section of the tool feed bar and the second section of the tool feed bar.

[0010] According to one embodiment of the present invention, the third section of the feed bar has a wedge-shaped side surface, wherein the distance from the wedge-shaped side surface to the axis gradually decreases along the first direction; when the reamer is in the retracted position, the back of the reamer abuts against the wedge-shaped side surface.

[0011] According to one embodiment of the present invention, the tool feed bar includes a flow-limiting nozzle disposed at the end of the first section of the tool feed bar within the center hole of the tool feed bar.

[0012] According to one embodiment of the present invention, the tool feed rod includes a sealing ring, which is sleeved on the outer wall of the first section of the tool feed rod, so that it is in a sealed sliding connection with the inner wall of the first section of the body.

[0013] According to one embodiment of the present invention, the device includes: a return spring, defined within an annular cavity defined by the inner wall of the eye-expanding device body, the outer wall of the feed rod, the first step portion of the body, and the step portion of the feed rod, configured to compress / elongate along the axis.

[0014] According to one embodiment of the present invention, the first segment of the body sequentially includes: a first segment of the first segment of the body; and a second segment of the first segment of the body, the inner diameter of which is smaller than the inner diameter of the first segment of the first segment of the body; wherein, a second step portion of the body is formed at the junction of the first segment of the first segment of the body and the second segment of the first segment of the body.

[0015] According to one embodiment of the present invention, the device includes an adjustment ring, which is detachably engaged at the second step portion of the body.

[0016] According to one embodiment of the present invention, the number of adjustment rings is 1 to 4, and the thickness of each adjustment ring is 5 mm.

[0017] According to one embodiment of the present invention, the blade of the eye-expanding knife is provided with cutting teeth, and the blade thickness is 30-35mm.

[0018] According to one embodiment of the present invention, the linkage mechanism includes: a first rotating pin fixed to the feed bar; a second rotating pin fixed to the reamer; and a connecting rod having a first rotating hole and a second rotating hole respectively at both ends along the length direction, the first rotating hole being rotatably fitted onto the first rotating pin, and the second rotating hole being rotatably fitted onto the second rotating pin.

[0019] According to one embodiment of the present invention, the second rotating hole is an oblong hole, and the long axis of the oblong hole is aligned with the extension direction of the connecting rod.

[0020] According to one embodiment of the present invention, the device includes: an upper connector detachably connected to one end of the eye-expanding device body, and having an upper connector center hole coaxial with the center hole of the body; wherein the outer diameter of the upper connector matches the inner diameter of the eye-expanding device body, and the inner diameter of the upper connector is smaller than the outer diameter of the tool feed rod and larger than the inner diameter of the tool feed rod.

[0021] By adopting the above technical solution, the present invention has at least one of the following advantages compared with the prior art:

[0022] 1. The eye-opening knife is limited by the connecting rod and the tool feed rod limiting structure, which ensures that the blade is in the normal opening state to the greatest extent.

[0023] 2. A reset spring structure is added. After the fluid pressure difference disappears, the reset spring retracts, causing the reamer to retract and effectively protecting the blade.

[0024] 3. By adjusting the ring to limit the position of the feed bar, the extension length of the reamer can be adjusted to suit different reaming diameter requirements;

[0025] 4. Thicken the blade of the eye expander to increase its strength and ensure the effectiveness of the eye expansion operation;

[0026] 5. The overall structure of the eye-expanding device is reasonably designed, and the contact surface between the eye-expanding blade and the stratum rock is stable during the eye-expanding process, which effectively improves the eye-expanding efficiency and ensures safe construction. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the horizontal docking salt cavern old well casing enlargement device according to the present invention;

[0029] Figure 2 This is a schematic diagram of the main body of the eye-expanding device according to the present invention;

[0030] Figure 3 This is a schematic diagram of the tool feeder according to the present invention;

[0031] Figure 4 yes Figure 1 A magnified view of the area within the box of the eye-expanding device shown.

[0032] In the picture:

[0033] 100 Eye-expanding device body, 110 First section of body, 111 First segment of first section of body, 112 Second segment of first section of body, 113 Second step of body, 120 Second section of body, 121 Pivot, 122 Opening, 130 First step of body.

[0034] 200 Tool feeder, 210 Tool feeder first section, 220 Tool feeder second section, 230 Tool feeder third section, 240 Tool feeder stepped section, 250 Wedge-shaped side, 260 Flow limiting nozzle, 270 Sealing ring;

[0035] 300 return spring;

[0036] 400 Adjusting Ring;

[0037] 500 reamer, 510 blade back, 520 blade edge, 521 cutting teeth;

[0038] 600 linkage mechanism, 610 first rotating pin, 620 second rotating pin, 630 linkage;

[0039] 700 connector;

[0040] O axis, F first direction, K1 body center hole, K2 tool feed bar center hole, K3 upper connector center hole. Detailed Implementation

[0041] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are for ease of description only, and should not be construed as limiting the technical solution.

[0043] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention, are intended to cover a non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.

[0044] In the description and claims of this invention and the foregoing drawings, when an element is referred to as "fixed to," "mounted to," "disposed on," or "connected to" another element, it can be located directly or indirectly on that other element. For example, when an element is referred to as "connected to" another element, it can be directly or indirectly connected to that other element.

[0045] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] Figure 1 shows the overall structure of a horizontal docking salt cavern old well casing reaming device according to some embodiments of the present invention in both working and non-working states. It generally includes: reaming device body 100, cutter rod 200, reaming cutter 500, and linkage mechanism 600. Figure 2 and Figure 3 The specific structures of the eye-expanding device body 100 and the knife feed bar 200 according to some embodiments of the present invention are shown respectively. Figure 4The enlarged view shown details the specific structure of the reamer 500 and the linkage mechanism 600. Specifically, the reamer body 100 includes a central hole K1 extending along its axis O, and a plurality of openings 122 evenly distributed circumferentially on its sidewalls. The number of openings 122 is the same as the number of reamers 500. In an embodiment of the invention, three openings 122 are evenly distributed circumferentially on the sidewalls of the reamer body 100, corresponding one-to-one with three reamers 500. The feed rod 200 is slidably disposed in the central hole K1 along the axis O, and has a feed rod central hole K2 coaxial with the central hole K1. The reamer 500 is pivotally connected to the reamer body 100 at a pivot 121 and is rotatable between a retracted position (non-working state) and an open position extending from the opening 122 (working state). The linkage mechanism 600 connects the reamer 500 to the feed bar 200 and is configured to limit the opening angle of the reamer 500 when it is in the open position.

[0047] exist Figure 2 In the illustrated embodiment, the eye-enlarging device body 100 sequentially comprises a first body segment 110 and a second body segment 120 along a first direction F parallel to axis O. The inner diameter of the second body segment 120 is smaller than the inner diameter of the first body segment 110, and a first step portion 130 is formed at their junction. The feed bar 200 can be designed to have an outer diameter that matches the inner diameter of the eye-enlarging device body 100, thereby forming a piston structure in the central hole K1 of the eye-enlarging device body 100.

[0048] exist Figure 3In the illustrated embodiment, the feed rod 200 may sequentially include: a first feed rod section 210, a second feed rod section 220, and a third feed rod section 230 along the first direction F. The outer diameter of the first feed rod section 210 matches the inner diameter of the body section 110, and the two are slidably connected to form a piston structure. Preferably, the feed rod 200 may include at least one sealing ring 270 sleeved on the outer wall of the first feed rod section 210, allowing it to be slidably and sealingly connected to the inner wall of the body section 110. The outer diameter of the second feed rod section 220 may match the inner diameter of the body section 120. The third feed rod section 230 is configured to connect to the reamer 500, and its outer diameter may be the same as the outer diameter of the second feed rod section 220. Preferably, the third section 230 of the feed bar may have a wedge-shaped side surface 250, the distance of which from the wedge-shaped side surface 250 to the axis O gradually decreases along the first direction F, and is configured such that when the reamer 500 is in the retracted position, its back 510 abuts against the wedge-shaped side surface 250. Alternatively, the third section 230 of the feed bar may be conical in shape, that is, the distance from the side wall of this section to the axis O gradually decreases uniformly along the first direction F. A feed bar step portion 240 is formed at the junction of the first section 210 and the second section 220 of the feed bar. In an embodiment of the present invention, the feed bar 200 may further include a flow-limiting nozzle 260, which is disposed at the end of the first section 210 of the feed bar and inside the central hole K2 of the feed bar, and serves as a throttling device.

[0049] Preferably, the eye-expanding device according to the present invention may further include a return spring 300, which is defined in an annular cavity defined by the inner wall of the eye-expanding device body 100, the outer wall of the feed bar 200, the first step portion 130 of the body and the step portion 240 of the feed bar, and is configured to compress / elongate along the axis O to assist the eye-expanding knife 500 in automatically resetting by means of elastic potential energy.

[0050] In another embodiment of the present invention, the first section 110 of the body of the eye-expanding device body 100 may further include, along the first direction, a first segment 111 and a second segment 112 of the first section 110. The inner diameter of the second segment 112 is smaller than the inner diameter of the first segment 111, and a second step portion 113 is formed at their junction. This second step portion 113 can serve as a limiting structure, limiting the maximum displacement of the tool feed bar 200 in the first direction F.

[0051] Preferably, the eye-expanding device may further include at least one adjusting ring 400. This adjusting ring 400 is detachably engaged at the second step portion 113 of the main body and, instead of the second step portion 113, acts as a limiting structure to limit the maximum displacement of the feed rod 200 in the first direction F. By adding adjusting rings 400 of different thicknesses and numbers, the stroke of the feed rod 200 can be adjusted, thereby controlling the opening angle of the eye-expanding blade 500, suitable for different eye-expanding diameter requirements. In embodiments of the present invention, the number of adjusting rings is preferably 1 to 4, and the thickness of each adjusting ring can be 5 mm.

[0052] The linkage mechanism 600 may include: a first rotating pin 610 fixed to the feed rod 200, a second rotating pin 620 fixed to the reamer 500, and a connecting rod 630. Specifically, the connecting rod 630 has a first rotating hole and a second rotating hole at both ends along its length. The first rotating hole is rotatably fitted onto the first rotating pin 610, and the second rotating hole is rotatably fitted onto the second rotating pin 620. Based on the above structure, the linkage mechanism 600 can convert the linear movement of the feed rod 200 along the axis O into the rotation of the reamer 500 around the pivot 121. Preferably, the second rotating hole fitted onto the second rotating pin 620 can be designed as an elongated hole, with the major axis of the elongated hole aligned with the extension direction of the connecting rod 600. This allows the rotation of the reamer 500 to be smoother and less prone to jamming.

[0053] The reamer 500 has cutting teeth 521 at the blade 520, and the blade thickness is preferably 30-35mm. Compared with conventional blades with a thickness of about 20mm, the reamer 500 in this application has been thickened to improve the strength of the blade body and ensure the effectiveness of the reaming operation.

[0054] Return to Figure 1 The eye-expanding device according to the present invention may further include an upper connector 700. The upper connector 700 is detachably connected to one end of the eye-expanding device body 100 and has an upper connector center hole K3 coaxial with the body center hole K1. The outer diameter of the upper connector 700 matches the inner diameter of the eye-expanding device body 100, and the inner diameter of the upper connector 700 is smaller than the outer diameter of the tool feed rod 200 but larger than the inner diameter of the tool feed rod 200. Based on the above structure, the end face of the upper connector 700 extending into the body center hole K1 can serve as a limiting structure, limiting the maximum displacement of the tool feed rod 200 in the direction opposite to the first direction F.

[0055] The reaming device can be driven by a power mechanism, which can be a pump. During on-site construction, the turntable is slowly rotated and the pump is started. Drilling fluid enters the upper connector center hole K3 of the upper connector 700. A throttling effect occurs at the flow-limiting nozzle 260, and the resulting pressure drop pushes the feed rod 200 downwards in the first direction F. During the downward movement of the feed rod 200, the wedge-shaped side 250 of its third section 230 pushes the cutting edge outwards. When the wedge side 250 reaches a certain position, the linkage mechanism 600 activates, continuing to push the reaming cutter 500 outwards. When the reaming cutter 500 expands to a certain outer diameter, it begins to contact the well wall, and the cutting teeth 521 cut the well wall, initiating the reaming operation. When the feed rod 200 reaches its lower stop point, the outer diameter of the reaming cutter 500 is limited, and the reaming cutter 500 expands to its maximum size. At this point, pressure can be slowly applied to begin reaming. After the reaming operation is completed, the pump is stopped. Under the action of the return spring 300, the feed rod 200 moves upward, simultaneously driving the linkage mechanism 600 to retract. At this time, the retraction force of the linkage mechanism 600 acts on the reamer 500, and the reamer 500 slowly retracts until it is back to the reaming device body 100. Then, the drill is pulled out and the tool is retrieved. The adjusting ring 400 adjusts the extension length of the reamer 500 by limiting the position of the feed rod 200, which is suitable for different reaming diameter requirements.

[0056] According to the reaming device of the present invention, in the initial stage, the hydraulic pressure difference is used to push the reaming cutter 500 to initially expand the borehole. In the latter half of the expansion stage, the linkage mechanism 600 pushes the cutter bar to continue expanding to the rated size, thereby completing the wellbore enlargement. In the embodiments of the present invention, the preferred reaming operation parameters are a drilling pressure of 10-20 kN, a rotation speed of 40 rpm, and a displacement of 14-15 L / s. Without the addition of the adjusting ring 400, this structure can enlarge a 177.8 mm wellbore to 270 mm, with an effective reaming size greater than 90 mm. By adding different numbers and thicknesses of adjusting rings 400, reaming operations of any size between 30 and 90 mm can be completed.

[0057] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0059] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A horizontal docking salt cavern old well casing reamer, characterized by, The reamer device has a maximum effective reaming size of greater than 90 mm, comprising: a reamer device body (100) comprising a body central hole (K1) extending along an axis (O) and a plurality of openings (122) distributed along a circumferential direction on a side wall, the reamer device body (100) comprising, in sequence along a first direction (F) parallel to the axis (O): a body first section (110); and a body second section (120) having an inner diameter smaller than that of the body first section (110); wherein the junction of the body first section (110) and the body second section (120) forms a body first step (130); the body first section (110) comprises, in sequence along the first direction (F): a body first section first subsection (111); and a body first section second subsection (112) having an inner diameter smaller than that of the body first section first subsection (111); wherein the junction of the body first section first subsection (111) and the body first section second subsection (112) forms a body second step (140); a knife feeding rod (200) slidably arranged in the body central hole (K1) along the axis (O) and having a knife feeding rod central hole (K2) coaxial with the body central hole (K1); a reaming knife (500) pivotally connected to the reamer device body (100) and rotatable between a retracted position and an extended position extending out of the opening (122); a linkage mechanism (600) connecting the reaming knife (500) to the knife feeding rod (200) to define an opening angle of the reaming knife (500) when the reaming knife (500) is in the extended position, the linkage mechanism (600) comprising: a first rotary pin (610) fixed to the knife feeding rod (200), a second rotary pin (620) fixed to the reaming knife (500), and a linkage rod (630) having a first rotary hole and a second rotary hole respectively formed at two ends along a length direction, the first rotary hole rotatably sleeving the first rotary pin (610), and the second rotary hole rotatably sleeving the second rotary pin (620); and an adjustment ring (400) detachably clamped at the body second step (140), the position of the knife feeding rod (200) being limited by the adjustment ring (400) to adjust the extension length of the reaming knife (500) to adapt to different reaming diameter requirements.

2. The apparatus of claim 1, wherein, the knife feeding rod (200) comprises, in sequence along the first direction (F): a knife feeding rod first section (210) having an outer diameter matching the inner diameter of the body first section (110); a knife feeding rod second section (220) having an outer diameter matching the inner diameter of the body second section (120); and a knife feeding rod third section (230) arranged to connect the reaming knife (500); and wherein the junction of the knife feeding rod first section (210) and the knife feeding rod second section (220) forms a knife feeding rod step (240).

3. The apparatus of claim 2, wherein, the knife feeding rod third section (230) has a wedge-shaped side surface (250), wherein, The distance of the wedge-shaped side surface (250) to the axis (O) gradually decreases along the first direction (F); When the reamer (500) is in the retracted position, the blade back (510) is arranged against the wedge-shaped side surface (250).

4. The apparatus of claim 2, wherein, The tool push rod (200) comprises a flow-limiting nozzle (260) arranged in the tool push rod central hole (K2) at the end of the tool push rod first section (210).

5. The apparatus of claim 2, wherein, The tool push rod (200) comprises a sealing ring (270) sleeved on the outer wall of the tool push rod first section (210) to achieve sealing sliding connection with the inner wall of the body first section (110).

6. The apparatus of claim 2, wherein, The device comprises: A reset spring (300) is arranged in the annular cavity defined by the inner wall of the reaming device body (100), the outer wall of the tool push rod (200), the body first step portion (130), and the tool push rod step portion (240), and is arranged to be compressed / elongated along the axis (O).

7. The apparatus of claim 1, wherein, The number of the adjusting rings (400) is 1-4, and the thickness of each adjusting ring (400) is 5 mm.

8. The apparatus of claim 1, wherein, The cutting teeth (521) are arranged at the blade edge (520) of the reamer (500), and the blade thickness is 30-35 mm.

9. The apparatus of claim 1, wherein, The second rotating hole is an oblong hole, and the long axis direction of the oblong hole is consistent with the extension direction of the connecting rod (630).

10. The apparatus of claim 1, wherein, The device comprises: An upper joint (700) is detachably connected to one end of the reaming device body (100) and has an upper joint central hole (K3) coaxial with the body central hole (K1); The outer diameter of the upper joint (700) matches the inner diameter of the reaming device body (100), the inner diameter of the upper joint (700) is smaller than the outer diameter of the tool push rod (200) and larger than the inner diameter of the tool push rod (200).

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