Casing pipe running grouting wellhead device

Abstract

The utility model relates to the technical field of casing grouting well mouths, in particular to a casing grouting well mouth device. The lower casing grouting wellhead device comprises a middle casing and an upper top cap installed at the top end of the middle casing, and a first adapter sleeve used for being connected with a lower casing machine is installed on the upper top cap. The lower pipe sleeve is fixedly connected with the bottom end of the middle sleeve through a flange structure, a valve seat is welded to the middle of the top end of the lower pipe sleeve, a valve plate used for sealing the valve seat is hinged to one side of the valve seat, and a plurality of conical thorn heads are evenly installed at the bottom end of the valve plate; the grouting pipe is embedded in one side of the lower pipe sleeve; the plugging head is fixedly installed at the bottom end of the lower pipe sleeve, a second adapter sleeve in butt joint with the underground casing pipe is installed at the bottom end of the plugging head, a clamping assembly is installed on the second adapter sleeve, and a slurry guide pipe communicated with the upper portion of the middle casing pipe is installed on the second adapter sleeve. The casing running grouting wellhead device has the advantages that grouting operation is safe and efficient, and continuous casing running is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of casing grouting wellheads, in particular to a casing grouting wellhead device. Background Art

[0002] Casing grouting wellhead is a key link in oil and gas drilling. It is mainly used for cementing operations to ensure the integrity and safety of the wellbore. When the casing is lowered, the downhole casing is extended into the wellhead. In order to avoid excessive pressure difference between the inside and outside of the casing, grouting is required to balance the pressure difference between the inside and outside.

[0003] During continuous pipe lowering, the casing is continuously pressed into the wellhead section by section by a pipe lowering machine. The traditional wellhead grouting device uses a filling device to inject slurry into the casing in the gaps during continuous pipe lowering. This mid-way grouting leads to low efficiency of continuous pipe lowering, and the grouting is prone to overflow, causing pollution to the wellhead platform.

[0004] Therefore, it is necessary to provide a new casing grouting wellhead device to solve the above technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a casing grouting wellhead device.

[0006] The casing grouting wellhead device provided by the utility model comprises: an intermediate casing and an upper cap installed on the top of the intermediate casing, wherein a transfer sleeve 1 for connecting with a casing machine is installed on the upper cap;

[0007] The lower sleeve is fixedly connected to the bottom end of the intermediate sleeve through a flange structure, and a valve seat is welded to the middle of the top end of the lower sleeve, a valve plate for sealing the valve seat is hinged on one side of the valve seat, and a plurality of cone spikes are evenly installed on the bottom end of the valve plate;

[0008] A grouting pipe, which is used to connect with the grouting end of the grouting machine and is embedded in one side of the lower pipe sleeve;

[0009] The plugging head is fixedly installed on the bottom end of the lower pipe sleeve, and the bottom end of the plugging head is installed with a second adapter sleeve docking with the downhole casing, the second adapter sleeve is installed with a clamping assembly, and the second adapter sleeve is installed with a slurry guide pipe connected with the upper part of the intermediate casing.

[0010] Preferably, a guide rod is fixedly installed in the middle of the bottom end of the upper cap, a connecting spring is fixedly sleeved on the guide rod, and one end of the connecting spring facing away from the upper cap extends into the middle sleeve and a partition plate is fixedly installed therein.

[0011] Preferably, the partition plate is provided with a through hole through which the guide rod passes, and the outer wall of the partition plate is slidably matched with the inner wall of the middle sleeve, and the outer wall of the partition plate is provided with a groove, and a sealing ring is embedded in the groove.

[0012] Preferably, a counterweight block is installed on the top of the valve plate, the counterweight block is provided with a liquid injection cavity, and a sealing screw for sealing the liquid injection cavity is threadedly installed on the counterweight block.

[0013] Preferably, a plurality of the clamping assemblies are provided, and the plurality of the clamping assemblies are distributed in a circle based on the axis of the second adapter sleeve.

[0014] Preferably, the clamping assembly includes a support plate and a hydraulic rod, the support plate is fixedly mounted on the outer side wall of the adapter sleeve 2, and the front end of the support plate is hinged with a clamping rod, the bottom end of the clamping rod is installed with a clamping block, the upper half of the clamping rod is provided with a sliding groove, the hydraulic rod is embedded in the adapter sleeve 2, and the output end of the hydraulic rod is hinged with an insertion rod that slides with the sliding groove.

[0015] Preferably, a long screw is installed at the bottom end of the plugging head, a threaded tube is threadedly installed on the long screw, and a liquid level sensor is embedded in the threaded tube.

[0016] Compared with the related art, the casing grouting wellhead device provided by the utility model has the following beneficial effects:

[0017] 1. The utility model provides a casing grouting wellhead device, which is provided with a valve seat, a valve plate and a cone piercing head in the casing, and uses an intermediate casing and a slurry guide pipe to communicate with the second adapter sleeve, so that when the casing lowering machine is docked with the casing for lowering the pipe, grouting can be carried out simultaneously, and after grouting, slurry can be prevented from flowing out of the second adapter sleeve to cause pollution to the wellhead platform;

[0018] 2. By arranging a guide rod, a connecting spring, a partition plate and a sealing ring on the upper cap, it is convenient to cut off the connection between the intermediate casing and the slurry guide pipe in time after the grouting is stopped to avoid slurry splashing, and use the intermediate casing to collect gas briefly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a preferred embodiment of the casing grouting wellhead device provided by the utility model;

[0020] Figure 2 A schematic diagram of the cross-section of the casing grouting wellhead device provided by the utility model;

[0021] Figure 3 A schematic diagram of the structure of the top cap provided by the utility model;

[0022] Figure 4A schematic diagram of the structure of the lower pipe sleeve provided by the utility model;

[0023] Figure 5 This is a structural schematic diagram of the adapter sleeve 2 provided by the utility model.

[0024] Numbers in the figure: 1. Intermediate sleeve; 11. Upper cap; 12. Adapter sleeve 1; 13. Guide rod; 14. Connecting spring; 15. Partition plate; 16. Sealing ring; 2. Lower sleeve; 21. Valve seat; 22. Valve plate; 23. Conical thorn head; 24. Counterweight; 25. Sealing screw; 201. Injection chamber; 3. Grouting pipe; 4. Sealing head; 41. Adapter sleeve 2; 5. Clamp assembly; 51. Support plate; 52. Clamp rod; 53. Clamp block; 54. Hydraulic rod; 55. Insert rod; 501. Slide; 6. Grouting pipe; 7. Long screw; 8. Threaded pipe; 9. Liquid level sensor. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0027] See also Figures 1 to 5 The present invention provides a casing grouting wellhead device, the casing grouting wellhead device comprising:

[0028] An intermediate casing 1, and an upper cap 11 installed on the top of the intermediate casing 1, wherein the upper cap 11 is installed with a transfer sleeve 12 for connecting with a casing lowering machine;

[0029] The lower sleeve 2 is fixedly connected to the bottom end of the intermediate sleeve 1 through a flange structure, and a valve seat 21 is welded to the middle of the top end of the lower sleeve 2, a valve plate 22 for sealing the valve seat 21 is hinged on one side of the valve seat 21, and a plurality of cone spikes 23 are evenly installed at the bottom end of the valve plate 22;

[0030] A grouting pipe 3, which is used to connect with the grouting end of the grouting machine and is embedded in one side of the lower pipe sleeve 2;

[0031] The plugging head 4 is fixedly mounted on the bottom end of the lower casing 2, and a second adapter sleeve 41 is mounted on the bottom end of the plugging head 4 for docking with the downhole casing, a clamping assembly 5 is mounted on the second adapter sleeve 41, and a slurry guide pipe 6 connected to the upper part of the intermediate casing 1 is mounted on the second adapter sleeve 41.

[0032] There are a plurality of clamping assemblies 5, and the clamping assemblies 5 are distributed in a circle based on the axis of the second adapter sleeve 41;

[0033] The clamping assembly 5 includes a support plate 51 and a hydraulic rod 54. The support plate 51 is fixedly mounted on the outer side wall of the adapter sleeve 41, and a clamping rod 52 is hinged at the front end of the support plate 51. A clamping block 53 is installed at the bottom end of the clamping rod 52. A sliding groove 501 is opened in the upper half of the clamping rod 52. The hydraulic rod 54 is embedded in the adapter sleeve 41, and an insertion rod 55 that slides with the sliding groove 501 is hinged at the output end of the hydraulic rod 54.

[0034] It should be noted that: when in use, the adapter sleeve 12 is connected to the output end of the pipe lowering machine, and then the downhole casing is connected with the adapter sleeve 2 41, and the hydraulic rod 54 of the clamping assembly 5 is started to extend, so as to push the clamping rod 53 to rotate along the support plate 51, and the clamping block 52 is driven to clamp the downhole casing during rotation, and then the downhole casing is connected with the adjacent casing in the wellhead, and the grouting machine is started to introduce the slurry from the grouting pipe 3 into the downhole casing 2. As the slurry is injected, the valve plate 22 is moved away from the valve seat 21. The liquid enters the middle casing 1 and is then introduced into the adapter sleeve 2 41 from the slurry guide pipe 6, and then flows into the downhole casing to complete the grouting. When a new downhole casing is replaced for lowering and withdrawing, the grouting machine stops conveying, and the valve plate 22 is reset to seal the valve seat 21 again to prevent the slurry from flowing back. The valve plate 22 is provided with a cone piercing head 23 to puncture the bubbles in the slurry, so that the slurry is conveyed smoothly. After the grouting is completed, the clamping assembly 5 is loosened and the pipe is put on and put down again, so as to realize continuous lowering and synchronous grouting.

[0035] In the embodiments of the present invention, please refer to Figures 1 to 5 A guide rod 13 is fixedly installed at the middle of the bottom end of the upper cap 11, and a connecting spring 14 is fixedly sleeved on the guide rod 13. The end of the connecting spring 14 away from the upper cap 11 extends into the middle sleeve 1 and is fixedly installed with a partition plate 15;

[0036] The partition plate 15 is provided with a through hole through which the guide rod 13 passes, and the outer wall of the partition plate 15 is slidably matched with the inner wall of the intermediate sleeve 1. The outer wall of the partition plate 15 is provided with a groove, and a sealing ring 16 is embedded in the groove.

[0037] It should be noted that: in this way, the partition plate 15 is used inside the intermediate casing 1 to separate the slurry guide pipe 6 from the lower casing 2. After no slurry is injected, when the downhole casing is connected, the slurry guide pipe 6 can act as an exhaust pipe to discharge the gas in the downhole casing into the upper half of the intermediate casing 1, and then discharge it from the slurry guide pipe 6 after disconnection, thereby preventing the gas from carrying too much slurry out of the downhole casing and causing slurry splashing.

[0038] In the embodiments of the present invention, please refer to Figures 1 to 5 A counterweight block 24 is installed at the top of the valve plate 22, and the counterweight block 24 is provided with a liquid injection cavity 201, and a sealing screw 25 for sealing the liquid injection cavity 201 is threadedly installed on the counterweight block 24;

[0039] It should be noted that: by injecting different volumes of counterweight liquid into the injection cavity 201, the valve plate 22 can adjust the opening water pressure of the valve plate 22, balance the slurry delivery rate, and reduce slurry impact.

[0040] In the embodiments of the present invention, please refer to Figures 1 to 5 A long screw 7 is installed at the bottom end of the plugging head 4, a threaded tube 8 is threadedly installed on the long screw 7, and a liquid level sensor 9 is embedded in the threaded tube 8;

[0041] It should be noted that: during the grouting operation, the liquid level sensor 9 is used to detect the slurry level in the connected downhole casing in real time to avoid excessive slurry injection, overflow, and pollution of the wellhead platform. The position of the liquid level sensor 9 can be adjusted by twisting the threaded tube 8 to slide up and down on the long screw 7.

[0042] The working principle of the casing grouting wellhead device provided by the utility model is as follows:

[0043] When in use, the adapter sleeve 12 is connected to the output end of the pipe lowering machine, and then the downhole casing is connected with the adapter sleeve 2 41, and the hydraulic rod 54 of the clamping assembly 5 is started to extend, so as to push the clamping rod 53 to rotate along the support plate 51, and the clamping block 52 is driven to clamp the downhole casing during rotation, and then the downhole casing is connected with the adjacent casing in the wellhead, and the grouting machine is started to introduce the slurry from the grouting pipe 3 into the downhole casing 2. With the injection of the slurry, the valve plate 22 is flushed away from the valve seat 21. , the liquid enters the middle casing 1, and then is introduced into the adapter sleeve 2 41 from the slurry guide pipe 6, and then flows into the downhole casing to complete the grouting. When a new downhole casing is replaced for lowering and withdrawing, the grouting machine stops conveying, and the valve plate 22 is reset to reseal the valve seat 21 to prevent the slurry from flowing back. The valve plate 22 is provided with a cone piercing head 23 to puncture the bubbles in the slurry, so that the slurry is conveyed smoothly. After the grouting is completed, the clamping assembly 5 is loosened and the pipe is put on and lowered again, so that continuous lowering and synchronous grouting can be achieved.

[0044] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0045] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A casing grouting wellhead device, comprising: An intermediate casing (1), and an upper cap (11) mounted on the top of the intermediate casing (1), wherein the upper cap (11) is mounted with a transfer sleeve (12) for connecting to a casing lowering machine; It is characterized by further comprising: A lower sleeve (2) is fixedly connected to the bottom end of the intermediate sleeve (1) via a flange structure, and a valve seat (21) is welded to the middle of the top end of the lower sleeve (2), a valve plate (22) for sealing the valve seat (21) is hingedly connected to one side of the valve seat (21), and a plurality of conical spikes (23) are evenly mounted on the bottom end of the valve plate (22); A grouting pipe (3), the grouting pipe (3) being used for docking with a grouting outlet of a grouting machine and being embedded in one side of the lower pipe sleeve (2); A plugging head (4) is fixedly mounted on the bottom end of the lower casing (2), and a second adapter sleeve (41) docking with the downhole casing is mounted on the bottom end of the plugging head (4), a clamping assembly (5) is mounted on the second adapter sleeve (41), and a slurry guide pipe (6) communicating with the upper part of the intermediate casing (1) is mounted on the second adapter sleeve (41).

2. The casing grouting wellhead device according to claim 1, characterized in that: A guide rod (13) is fixedly mounted at the middle of the bottom end of the upper cap (11), a connecting spring (14) is fixedly sleeved on the guide rod (13), and one end of the connecting spring (14) facing away from the upper cap (11) extends into the middle sleeve (1) and is fixedly mounted with a partition plate (15).

3. The casing grouting wellhead device according to claim 2, characterized in that: The partition plate (15) is provided with a through hole through which the guide rod (13) passes, and the outer wall of the partition plate (15) is slidably matched with the inner wall of the middle sleeve (1). The outer wall of the partition plate (15) is provided with a groove, and a sealing ring (16) is embedded in the groove.

4. The casing grouting wellhead device according to claim 1, characterized in that: A counterweight (24) is mounted on the top end of the valve plate (22); a liquid injection cavity (201) is formed in the counterweight (24); and a sealing screw (25) for sealing the liquid injection cavity (201) is threadedly mounted on the counterweight (24).

5. The casing grouting wellhead device according to claim 1, characterized in that: A plurality of the clamping assemblies (5) are provided, and the plurality of the clamping assemblies (5) are distributed in a circle based on the axis of the second adapter sleeve (41).

6. The casing grouting wellhead device according to claim 5, characterized in that: The clamping assembly (5) comprises a support plate (51) and a hydraulic rod (54); the support plate (51) is fixedly mounted on the outer side wall of the second adapter sleeve (41); a clamping rod (52) is hingedly connected to the front end of the support plate (51); a clamping block (53) is installed at the bottom end of the clamping rod (52); a sliding groove (501) is provided on the upper half of the clamping rod (52); the hydraulic rod (54) is embedded in the second adapter sleeve (41); and an insertion rod (55) that slidably cooperates with the sliding groove (501) is hingedly connected to the output end of the hydraulic rod (54).

7. The casing grouting wellhead device according to claim 1, characterized in that: A long screw (7) is installed at the bottom end of the plugging head (4), a threaded tube (8) is threadedly installed on the long screw (7), and a liquid level sensor (9) is embedded in the threaded tube (8).

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