Full-gauge float collar with annular pressure-opening configuration and pressure-measuring device

Abstract

The present application relates to the technical field of drilling, especially relates to a full-gauge float collar with an annular pressure opening structure and a pressure measuring device to alleviate the problem that the existing equipment cannot accurately control pressure due to the use of a shear pin structure, which is not conducive to structural optimization. The full-gauge float collar comprises an upper joint, a rupture disc, a sliding sleeve, a snap ring, an impact sleeve and a lower joint; the upper joint is threadedly connected with the lower joint; the sliding sleeve is arranged in the upper joint; the rupture disc is clamped on the upper portion of the sliding sleeve; the impact sleeve is arranged on the lower portion of the sliding sleeve and is slidingly connected with the sliding sleeve; the snap ring is sleeved with the impact sleeve, the upper portion of the snap ring is in abutment with the lower portion of the sliding sleeve; the lower portion of the snap ring is in abutment with the upper portion of the lower joint; after the sliding sleeve moves downward, the snap ring can be cut off, so that the rupture disc impacts the impact sleeve. When measuring the shear value of the snap ring, the pressure equipment is connected with the upper shell, and is gradually pressurized until the snap ring is sheared, and the test is repeated by replacing the snap ring of different sizes, so that the shear value of each type of snap ring used can be confirmed.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, and in particular to a full-bore floating coupling with an annular pressure opening structure and a pressure measuring device. Background Technology

[0002] In recent years, full-bore floating couplings have been widely used in the domestic shale gas market and in extended reach horizontal wells in various oilfields. They utilize a fracture disc as a temporary barrier; after the casing is in place, pressure is applied at the wellhead to break the fracture disc, achieving full-bore tubing and facilitating subsequent workover operations. To ensure stable opening pressure and effective fracturing, full-bore floating couplings employ a sliding sleeve impact design. The fracture disc is housed in the sliding sleeve, and during opening, the fracture disc, propelled by hydraulic pressure, descends with the sliding sleeve, impacting and breaking, thus completing the opening action. Currently, due to variations in well depth and mud density, hydrostatic pressures differ significantly. Traditional shear pin control of opening pressure relies on the shear value of a single shear pin for precise adjustment, making fine control impossible. Furthermore, an excessive number of shear pin holes can negatively impact tool structural strength, and smaller shear pin sizes hinder structural optimization during tool standardization. Summary of the Invention

[0003] This invention provides a full-bore floating coupling with an annular pressure opening structure and a pressure measuring device to alleviate the problem that the use of shear pin structures in existing equipment leads to inaccurate pressure control and hinders structural optimization.

[0004] To alleviate the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0005] This solution provides a full-bore floating coupling with an annular pressure opening structure, including an upper connector, a rupture disc, a sliding sleeve, a retaining ring, an impact sleeve, and a lower connector;

[0006] The upper and lower connectors are threaded together.

[0007] The sliding sleeve is located inside the upper connector;

[0008] The broken disc is engaged with the upper part of the sliding sleeve;

[0009] The impact sleeve is located at the lower part of the sliding sleeve and is slidably connected to the sliding sleeve;

[0010] The retaining ring engages with the impact sleeve, and its upper part abuts against the lower part of the sliding sleeve;

[0011] The lower part of the retaining ring abuts against the upper part of the lower connector;

[0012] After the sliding sleeve moves downward, it can cut off the retaining ring, causing the ruptured disc to impact the sleeve.

[0013] Furthermore,

[0014] There is a first cavity between the upper connector and the lower connector;

[0015] There is a second cavity between the sliding sleeve and the impact sleeve;

[0016] The sliding sleeve can move downward along the first cavity;

[0017] The lower part of the retaining ring is located in the first cavity, and the upper part is located in the second cavity.

[0018] Furthermore,

[0019] The upper part of the retaining ring is provided with a first annular protrusion and a first annular end face;

[0020] The lower part of the retaining ring is provided with a second annular protrusion and a second annular end face;

[0021] The lower part of the first annular protrusion corresponds to the end face of the second annular ring;

[0022] The lower part of the first annular end face corresponds to the second annular protrusion.

[0023] Furthermore,

[0024] The first annular protrusion is engaged within the second cavity;

[0025] The first annular end face abuts against the lower part of the sliding sleeve;

[0026] The second annular protrusion is disposed inside the first cavity;

[0027] The second annular end face abuts against the upper part of the lower connector.

[0028] Furthermore,

[0029] The cross-sectional width of the second annular protrusion is smaller than the cross-sectional width of the first cavity.

[0030] A device for measuring the opening pressure of a full-bore floating coupling includes the aforementioned full-bore floating coupling with an annular pressure opening structure.

[0031] Furthermore,

[0032] Includes an upper housing, an upper cover plate, an adjusting ring, and a lower housing;

[0033] The upper and lower housings are connected by threads;

[0034] The adjusting ring is located inside the upper housing and is slidably connected to the inner wall of the upper housing;

[0035] The upper cover plate is fixedly connected to the upper part of the adjusting ring;

[0036] The lower part of the adjusting ring abuts against the end face of the first ring;

[0037] The upper part of the lower housing abuts against the second annular end face.

[0038] Furthermore,

[0039] The cross-sectional width of the second annular protrusion is smaller than the gap between the upper and lower shells.

[0040] Furthermore,

[0041] The upper housing side wall is provided with a pressure relief hole;

[0042] The pressure relief hole is blocked and closed by the adjusting ring. When the retaining ring is completely sheared, the adjusting ring moves downward, allowing the pressure relief hole to connect the inside and outside of the upper housing.

[0043] Furthermore,

[0044] Includes the following steps:

[0045] S1: Connect the upper part of the upper housing to the pressure testing equipment;

[0046] S2: Start the pressurization equipment and gradually increase the pressure, recording the pressure value when the retaining ring shears.

[0047] S3: Repeat S1 and S2 by changing to a different size circlip.

[0048] The beneficial effects of the full-bore floating coupling with an annular pressure opening structure and pressure measuring device in this invention are analyzed as follows:

[0049] The snap ring connection method greatly reduces the number of traditional shear pin holes, reduces the impact on the structural strength of the tool, and enhances the durability and reliability of the tool. Through mass production, the shear pressure can be kept consistent, allowing for precise control of the wellhead pressurization pressure and improving the safety and efficiency of the operation. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0051] Figure 1 A schematic diagram of a full-bore floating coupling with an annular pressure opening structure provided for an embodiment of the present invention;

[0052] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0053] Figure 3 This is a schematic diagram of the clasp structure;

[0054] Figure 4 A schematic diagram of the structure for activating the pressure measuring device;

[0055] Figure 5 This is a flowchart illustrating the operating steps when using a measuring device.

[0056] icon:

[0057] 001 - First cavity;

[0058] 002 - Second cavity;

[0059] 100 - Upper connector; 110 - Lower connector;

[0060] 200-ruptured disc;

[0061] 300-sliding sleeve;

[0062] 400 - Snap ring; 410 - First annular protrusion; 420 - First annular end face; 430 - Second annular protrusion; 440 - Second annular end face;

[0063] 500-Impact Sleeve;

[0064] 600 - Upper housing; 610 - Pressure relief hole;

[0065] 700 - Top cover plate;

[0066] 800 - Adjusting ring;

[0067] 900 - Lower housing. Detailed Implementation

[0068] Because the depth and mud density of the wells vary, the hydrostatic pressures differ greatly. The traditional method of controlling the opening pressure with shear pins depends on the shear value of a single shear pin, which makes precise control impossible. Furthermore, too many shear pin holes can affect the structural strength of the tool. Also, when tools are serialized, shear pins at small sizes are not conducive to structural optimization.

[0069] In view of this, this solution provides a full-bore floating coupling with an annular pressure opening structure to alleviate the above problems.

[0070] This device includes an upper connector 100, a rupture disc 200, a sliding sleeve 300, a retaining ring 400, an impact sleeve 500, and a lower connector 110.

[0071] The upper connector 100 and the lower connector 110 are threaded together.

[0072] The sliding sleeve 300 is located inside the upper connector 100;

[0073] The rupture disc 200 is snapped onto the upper part of the sliding sleeve 300;

[0074] The impact sleeve 500 is located at the lower part of the sliding sleeve 300 and is slidably connected to the sliding sleeve 300;

[0075] The retaining ring 400 is sleeved with the impact sleeve 500, and its upper part abuts against the lower part of the sliding sleeve 300;

[0076] The lower part of the retaining ring 400 abuts against the upper part of the lower connector 110;

[0077] After the sliding sleeve 300 moves downward, it can cut the retaining ring 400, causing the ruptured disc 200 to impact the impact sleeve 500.

[0078] During the floating casing operation, a full-bore floating coupling is installed at a specific position on the casing to separate the air section below the floating coupling from the grouting end above the floating coupling. After the casing is lowered to the designed position, the hydrostatic pressure above the floating coupling and the pressure at the wellhead are combined and acted on the rupture disc 200 by pressurizing the wellhead. The rupture disc 200 drives the sliding sleeve 300 to move downward. When the downward force exceeds the shear value of the retaining ring 400, the retaining ring 400 breaks, causing the rupture disc 200 to continue to move downward and collide with the impact sleeve 500, causing the rupture disc 200 to break and the channel inside the floating coupling to be connected.

[0079] In this design, a first cavity 001 exists between the upper connector 100 and the lower connector 110;

[0080] A second cavity 002 is provided between the sliding sleeve 300 and the impact sleeve 500;

[0081] The sliding sleeve 300 can move downward along the first cavity 001;

[0082] The lower part of the retaining ring 400 is disposed in the first cavity 001, and the upper part is disposed in the second cavity 002.

[0083] In this design, the upper part of the retaining ring 400 is provided with a first annular protrusion 410 and a first annular end face 420;

[0084] The lower part of the retaining ring 400 is provided with a second annular protrusion 430 and a second annular end face 440;

[0085] The lower part of the first annular protrusion 410 corresponds to the second annular end face 440;

[0086] The lower part of the first annular end face 420 corresponds to the second annular protrusion 430;

[0087] The first annular protrusion 410 is engaged within the second cavity 002;

[0088] The first annular end face 420 abuts against the lower part of the sliding sleeve 300;

[0089] The second annular protrusion 430 is disposed within the first cavity 001;

[0090] The second annular end face 440 abuts against the upper part of the lower connector 110.

[0091] Specifically, the cross-section of the retaining ring 400 is stepped, and the upper part of the lower connector 110 has a platform that mates with the second annular end face 440. When the sliding sleeve 300 moves down and presses the first annular end face 420, the second annular end face 440 makes full contact with the upper part of the lower connector 110, preventing the retaining ring 400 from shaking and becoming unstable after being pressed. The first annular end face 420 is subjected to a downward shearing force, and the second annular end face 440 is subjected to an upward shearing force, causing the retaining ring 400 to break. The part between the first annular end face 420 and the second annular protrusion 430 falls into the bottom of the first cavity 001 after breaking, so that the downward movement of the sliding sleeve 300 is not affected.

[0092] Preferably, the cross-sectional width of the second annular protrusion 430 is smaller than the cross-sectional width of the first cavity 001, so as to avoid the second annular protrusion 430 from breaking and getting stuck in the upper part of the first cavity 001, making it difficult for the sliding sleeve 300 to move down and affecting the opening of the floating coupling channel.

[0093] This solution also provides an opening pressure measuring device for a full-bore floating coupling, comprising an upper housing 600, an upper cover plate 700, an adjusting ring 800, and a lower housing 900;

[0094] The upper housing 600 and the lower housing 900 are threaded together;

[0095] The adjusting ring 800 is disposed inside the upper housing 600 and is slidably connected to the inner wall of the upper housing 600;

[0096] The upper cover plate 700 is fixedly connected to the upper part of the adjusting ring 800;

[0097] The lower part of the adjusting ring 800 abuts against the first annular end face 420;

[0098] The upper part of the lower housing 900 abuts against the second annular end face 440.

[0099] Specifically, after the adjusting ring 800 is connected to the upper cover plate 700, the upper part of the measuring device is completely sealed. Pressure can be applied to the upper part of the measuring device through an external pressure device. When the retaining ring 400 reaches the shear value and breaks, the pressure will decrease. Therefore, the maximum pressure value on the pressure device can be recorded to determine the shear pressure value corresponding to the retaining ring 400.

[0100] In this design, the cross-sectional width of the second annular protrusion 430 is smaller than the gap between the upper housing 600 and the lower housing 900, so as to prevent the broken second annular protrusion 430 from getting stuck.

[0101] In this design, a pressure relief hole 610 is provided on the side wall of the upper housing 600;

[0102] The pressure relief hole 610 is blocked and closed by the adjusting ring 800. When the retaining ring 400 reaches the shear value and breaks completely, the adjusting ring 800 moves downward, so that the pressure relief hole 610 connects the inside and outside of the upper housing 600, thereby reducing the pressure inside the measuring device and facilitating operation by the staff.

[0103] In this scheme, the measuring device includes the following steps:

[0104] S1: Connect the upper part of the upper housing 600 to the pressure testing equipment;

[0105] S2: Start the pressurization equipment and gradually increase the pressure, recording the pressure value when the retaining ring 400 undergoes shearing;

[0106] S3: Replace with a different size retaining ring 400 and repeat S1 and S2.

[0107] Specifically, the pressure required for the retaining ring 400 to reach the shear value depends on the height difference between the first annular end face 420 and the second annular end face 440. Therefore, by adjusting and measuring the value of this height difference, the pressure required for the retaining ring 400 to reach the shear value under this height difference can be determined. This data is convenient for designing and using full-bore floating couplings with annular pressure opening structures.

[0108] This solution has at least the following beneficial effects:

[0109] The 400 snap ring's structural design significantly reduces the number of traditional shear pin holes, minimizing the impact on tool structural strength and enhancing durability and reliability. When standardizing tools, this design allows for better structural optimization of different sizes and types, meeting a wider range of operational needs.

[0110] This solution also includes an activation pressure measurement device to accurately record pressure values ​​during shearing, providing data support for subsequent design and improvements. This adjustable measurement mechanism not only simplifies the operation process but also enhances the reusability and ease of debugging of the tool. Overall, this solution not only improves the performance and adaptability of full-bore floating couplings but also provides greater safety and economic benefits for related operations.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A full-bore floating coupling with an annular pressure-opening structure, characterized in that: It includes an upper connector (100), a rupture disc (200), a sliding sleeve (300), a retaining ring (400), an impact sleeve (500), and a lower connector (110); The upper connector (100) is threadedly connected to the lower connector (110); The sliding sleeve (300) is disposed inside the upper connector (100); The rupture disc (200) is engaged with the upper part of the sliding sleeve (300); The impact sleeve (500) is disposed at the lower part of the sliding sleeve (300) and is slidably connected to the sliding sleeve (300); The retaining ring (400) is sleeved with the impact sleeve (500), and its upper part abuts against the lower part of the sliding sleeve (300); The lower part of the retaining ring (400) abuts against the upper part of the lower connector (110); After the sliding sleeve (300) moves downward, it can cut off the retaining ring (400), causing the rupture disc (200) to impact the impact sleeve (500).

2. The full-bore floating coupling with an annular pressure opening structure according to claim 1, characterized in that: A first cavity (001) is provided between the upper connector (100) and the lower connector (110); A second cavity (002) is provided between the sliding sleeve (300) and the impact sleeve (500); The sliding sleeve (300) is capable of moving downward along the first cavity (001); The lower part of the retaining ring (400) is disposed in the first cavity (001), and the upper part is disposed in the second cavity (002).

3. The full-bore floating coupling with an annular pressure opening structure according to claim 2, characterized in that: The upper part of the retaining ring (400) is provided with a first annular protrusion (410) and a first annular end face (420); The lower part of the retaining ring (400) is provided with a second annular protrusion (430) and a second annular end face (440); The lower part of the first annular protrusion (410) corresponds to the second annular end face (440); The lower part of the first annular end face (420) corresponds to the second annular protrusion (430).

4. The full-bore floating coupling with an annular pressure opening structure according to claim 3, characterized in that: The first annular protrusion (410) is engaged within the second cavity (002); The first annular end face (420) abuts against the lower part of the sliding sleeve (300); The second annular protrusion (430) is disposed within the first cavity (001); The second annular end face (440) abuts against the upper part of the lower connector (110).

5. The full-bore floating coupling with an annular pressure opening structure according to claim 4, characterized in that: The cross-sectional width of the second annular protrusion (430) is smaller than the cross-sectional width of the first cavity (001).

6. An opening pressure measuring device for a full-bore floating coupling includes a full-bore floating coupling with an annular pressure opening structure as described in any one of claims 1-5.

7. The opening pressure measuring device for the full-bore floating coupling according to claim 6, characterized in that: It includes an upper housing (600), an upper cover plate (700), an adjusting ring (800), and a lower housing (900); The upper housing (600) is threadedly connected to the lower housing (900); The adjusting ring (800) is disposed inside the upper housing (600) and is slidably connected to the inner wall of the upper housing (600); The upper cover plate (700) is fixedly connected to the upper part of the adjusting ring (800); The lower part of the adjusting ring (800) abuts against the first annular end face (420); The upper part of the lower housing (900) abuts against the second annular end face (440).

8. The opening pressure measuring device for the full-bore floating coupling according to claim 7, characterized in that: The cross-sectional width of the second annular protrusion (430) is smaller than the gap between the upper housing (600) and the lower housing (900).

9. The opening pressure measuring device for a full-bore floating coupling according to claim 8, characterized in that: The upper housing (600) has a pressure relief hole (610) on its side wall; The pressure relief hole (610) is blocked and closed by the adjusting ring (800). When the retaining ring (400) is completely sheared, the adjusting ring (800) moves downward, so that the pressure relief hole (610) connects the inside and outside of the upper housing (600).

10. The opening pressure measuring device for a full-bore floating coupling according to claim 9, characterized in that: Includes the following steps: S1: Connect the upper part of the upper housing (600) to the pressure testing equipment; S2: Start the pressurizing device and gradually increase the pressure, recording the pressure value when the retaining ring (400) undergoes shearing; S3: Replace the retaining ring (400) of different sizes and repeat S1 and S2.

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