Multifunctional wellhead grouting mud scraper

Abstract

The invention relates to the technical field of well drilling equipment, and discloses a multifunctional well mouth grouting mud scraper which comprises a shell arranged at a well mouth, and a drilling tool penetrates through the shell and extends into a shaft; the mud scraping assembly comprises a plurality of mud scraping pieces, the mud scraping pieces are arranged on the upper portion of the inner side wall of the shell at equal intervals in the circumferential direction, an air inlet is formed in the upper portion of the shell and communicates with an external air source, and the mud scraping pieces are controlled by the external air source to extend to make contact with the drilling tool so that mud on the drilling tool can be scraped away; the grouting assembly comprises a rotor and a liquid inlet, the rotor is rotationally connected to the lower portion of the inner side wall of the shell, the two ends of the liquid inlet are connected with the rotor and the slurry pump respectively, and drilling fluid enters the rotor on the lower portion of the shell from the slurry pump so as to drive the rotor to rotate to wash the drilling tool and convey the drilling fluid into the shaft. The working mode of scraping mud while grouting is achieved, the applicable drill string diameter range is wider, the wellhead operation process is simplified, manpower and time cost are saved, the well control risk is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, in particular to a multifunctional wellhead grouting scraper. Background Art

[0002] Drilling is an important part of the oil and gas industry, and pulling out the drill bit is one of the basic processes in the drilling process.

[0003] The existing technology has the following disadvantages in the drilling process:

[0004] (1) The mud adhering to the surface of the drill bit is corrosive to the drill. After the mud on the surface of the drill bit dries and clumps, it is easy to fall off from the high altitude and pose a safety hazard to the drilling platform workers. Therefore, the mud adhering to the surface of the drill bit should be scraped off in time during the drilling process. The scraping is largely done by the internal and external fitters at the drilling construction site, which is time-consuming and laborious.

[0005] (2) Pulling out the drill hole will cause the drilling fluid level in the wellbore to drop. In order to balance the formation pressure and protect the wellbore wall, grouting is required in a timely manner, and the grouting amount is controlled by observing the liquid level at the wellhead, which results in low work efficiency. Summary of the invention

[0006] The purpose of the present invention is to provide a multifunctional wellhead grouting scraper to solve the problems existing in the above-mentioned prior art.

[0007] To achieve the above object, the present invention provides the following solution: The present invention provides a multifunctional wellhead grouting scraper, comprising:

[0008] A housing is arranged at the wellhead, and a drilling tool passes through the housing and extends into the wellbore;

[0009] A scraper assembly includes a plurality of scrapers, which are arranged at equal intervals along the circumferential direction on the upper portion of the inner wall of the housing, and an air inlet is arranged on the upper portion of the housing, the air inlet is connected to an external air source, and the scraper is controlled by the external air source to extend and contact the drilling tool, so that the scraper can scrape the mud on the drilling tool;

[0010] The grouting assembly includes a rotor and a liquid inlet. The rotor is rotatably connected to the lower part of the inner wall of the shell. The two ends of the liquid inlet are respectively connected to the rotor and a mud pump. The drilling fluid enters the rotor from the mud pump to drive the rotor to rotate and transport the drilling fluid into the wellbore.

[0011] Preferably, the scraper comprises a telescopic rod fixedly connected to the inner wall of the shell, the telescopic end of the telescopic rod is fixedly connected to a cleaning block, the cleaning block is in contact with the drilling tool, and the telescopic rod is connected to the air inlet.

[0012] Preferably, an air delivery groove is provided at the upper portion of the inner side wall of the shell, the rear end of the telescopic rod is a hollow groove, the hollow groove is connected to the air delivery groove, and the air delivery groove is connected to the air inlet.

[0013] Preferably, an upper groove and a lower groove are respectively provided at the upper and lower parts of the outer wall of the rotor, and the upper groove and the lower groove are not connected. An infusion groove is provided at the lower part of the inner wall of the shell, and the liquid inlet is connected with the upper groove through the infusion groove. A plurality of drainage holes are provided at the lower part of the inner wall of the rotor, and the drainage holes are connected with the lower groove.

[0014] Preferably, a plurality of baffles are fixedly connected in the circumferential direction in the upper groove, and the drilling fluid in the infusion tank enters between two adjacent baffles along the tangential direction.

[0015] Preferably, the upper groove and the lower groove are both annular grooves, and the annular angle is 360°;

[0016] Preferably, the infusion groove is an annular groove with an annular angle of 270°, the head end is connected to the liquid inlet, and the tail end is provided with a vertical groove vertically downward along the inner wall of the shell, the upper part of the vertical groove is connected to the infusion groove, and the lower part of the vertical groove is connected to the lower groove.

[0017] Preferably, a flow meter is provided on the liquid inlet.

[0018] Preferably, the rotor is rotatably connected to the housing via a bearing;

[0019] A blocking strip is provided in the middle of the inner side wall of the shell, an upper plug is provided at the upper part of the inner side wall of the shell, and the telescopic rod is fixedly connected between the upper plug and the blocking strip;

[0020] A lower plug is provided at the lower part of the inner wall of the shell, and the bearing is located between the blocking strip and the lower plug.

[0021] Preferably, the baffle is an arc-shaped structure.

[0022] Preferably, the cleaning block is a rubber block.

[0023] Compared with the prior art, the present invention has the following advantages and technical effects:

[0024] The multifunctional wellhead grouting scraper provided by the present invention has a shell installed at the wellhead, and the drill tool extends into the wellbore through the shell. When in use, air is transported to the upper part of the shell through an external air source to make the scraper contact with the drill tool, so as to clean the mud on the drill tool. At the same time, the external mud is transported to the rotor at the lower part of the shell through the liquid inlet to drive the rotor to rotate, and the drilling fluid is transported to the wellbore for grouting. The present application combines the scraping of the drill tool during the drilling process with the grouting into the wellbore to realize the working mode of scraping mud and grouting at the same time. The applicable drill string diameter range is wider, the wellhead operation process is simplified, the manpower and time costs are saved, the well control risk is reduced, and the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the gas delivery tank and the liquid delivery tank of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the mud scraper of the present invention;

[0030] Figure 5 This is a schematic diagram of the internal structure of the rotor of the present invention;

[0031] Among them, 1. shell; 2. air inlet; 3. rotor; 4. liquid inlet; 5. telescopic rod; 6. cleaning block; 7. air delivery groove; 8. upper groove; 9. lower groove; 10. liquid delivery groove; 11. drainage hole; 12. baffle; 13. bearing; 14. hollow groove; 15. vertical groove; 16. upper plug; 17. blocking strip; 18. lower plug. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figure 1-Figure 5 The present invention provides a multifunctional wellhead grouting scraper, comprising:

[0035] The outer shell 1 is arranged at the wellhead, and the drilling tool penetrates the outer shell 1 and extends into the wellbore;

[0036] The scraper assembly includes a plurality of scrapers, which are arranged at equal intervals along the circumferential direction on the upper part of the inner wall of the housing 1. The upper part of the housing 1 is provided with an air inlet 2, which is connected to an external air source. The scraper is controlled by the external air source to extend and contact the drilling tool, so that the scraper can scrape the mud on the drilling tool.

[0037] The grouting assembly includes a rotor 3 and a liquid inlet 4. The rotor 3 is rotatably connected to the lower part of the inner wall of the shell 1. The two ends of the liquid inlet 4 are respectively connected to the rotor 3 and the mud pump. The drilling fluid enters the rotor 3 from the mud pump, thereby driving the rotor 3 to rotate to flush the drill bit and transport the drilling fluid to the wellbore.

[0038] A further optimized solution is that the scraper includes a telescopic rod 5 fixedly connected to the upper inner wall of the outer shell 1, the telescopic end of the telescopic rod 5 is fixedly connected to a cleaning block 6, the cleaning block 6 is in contact with the drilling tool, and the telescopic rod 5 is connected to the air inlet 2.

[0039] Reference Figure 1 , Figure 3 The cleaning block 6 is driven by the telescopic rod 5 to contact the drilling tool, so as to clean the mud on the drilling tool, so that the device is applicable to a wider range of drill string diameters.

[0040] According to a further optimization scheme, a gas delivery groove 7 is provided on the upper inner wall of the outer shell 1 , a hollow groove 14 is provided at the rear end of the telescopic rod 5 , the hollow groove 14 is connected to the gas delivery groove 7 , and the air inlet 2 is connected to the gas delivery groove 7 .

[0041] Reference Figure 3 , Figure 4 The telescopic rod 5 is preferably a four-stage telescopic rod with a hollow structure inside and is connected to the gas supply groove 7. The telescopic rod 5 is extended by gas delivered by an external gas source to make the cleaning block 6 contact the drilling tool. Conversely, the telescopic rod 5 is contracted under the action of the spring to separate the cleaning block 6 from the drilling tool.

[0042] A further optimized solution is that an upper groove 8 and a lower groove 9 are respectively provided on the upper and lower parts of the outer wall of the rotor 3, the upper groove 8 and the lower groove 9 are not connected, an infusion groove 10 is opened at the lower part of the inner wall of the outer shell 1, and the liquid inlet 4 is connected with the upper groove 8 through the infusion groove 10, and a plurality of drainage holes 11 are opened at the lower part of the inner wall of the rotor 3, and the drainage holes 11 are connected with the lower groove 9.

[0043] According to a further optimized solution, a plurality of baffles 12 are fixedly connected in the circumferential direction in the upper groove 8, and the drilling fluid in the infusion tank 10 enters between two adjacent baffles 12 along the tangential direction.

[0044] Further optimizing the scheme, the upper groove 8 and the lower groove 9 are both annular grooves, and the annular angle is 360°;

[0045] The infusion groove 10 is an annular groove with an annular angle of 270°. The head end is connected to the liquid inlet 4, and the tail end is provided with a vertical groove 15 vertically downward along the inner wall of the shell 1. The upper part of the vertical groove 15 is connected to the infusion groove 10, and the lower part of the vertical groove 15 is connected to the lower groove 9.

[0046] Reference Figure 3 and Figure 5 The infusion tank 10 delivers the drilling fluid to between two adjacent baffles 12 in the upper groove 8, driving the rotor 3 to rotate. When the rotor 3 rotates 270°, the drilling fluid enters the lower groove 9 through the vertical groove 15 and is discharged from the drainage hole 11 to the wellbore to achieve grouting.

[0047] To further optimize the solution, a flow meter is provided on the liquid inlet 4.

[0048] The liquid inlet 4 is connected to a mud pump (not shown) through a pipeline (not shown in the figure), and a flow meter (not shown in the figure) is arranged on the pipeline, and the grouting condition is observed through the arranged flow meter.

[0049] In a further optimized solution, the rotor 3 is rotatably connected to the housing 1 via a bearing 13;

[0050] A blocking strip 17 is provided in the middle of the inner wall of the housing 1, an upper plug 16 is provided at the upper part of the inner wall of the housing 1, and the telescopic rod 5 is fixedly connected between the upper plug 16 and the blocking strip 17;

[0051] A lower plug 18 is provided at the lower portion of the inner wall of the housing 1 , and the bearing 13 is located between the blocking strip 17 and the lower plug 18 .

[0052] Reference Figure 2 The rotor 3 is rotatably connected to the housing 1 via a bearing 13 , and the bearing 13 is provided to bear the weight of the rotor 3 and reduce its rotational resistance.

[0053] According to a further optimized solution, the baffle 12 is an arc-shaped structure.

[0054] Reference Figure 3 The baffle 12 is an arc-shaped structure, and the inner surface of the arc corresponds to the direction in which the drilling fluid enters, thereby ensuring that the entering drilling fluid drives its rotor 3 to rotate.

[0055] According to a further optimized solution, the cleaning block 6 is a rubber block.

[0056] The rubber block material ensures that the drilling fluid can be cleaned while avoiding damage to the drilling tools.

[0057] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. Multifunctional wellhead grouting scraper, characterized in that: include: A housing (1) is arranged at the wellhead, and a drilling tool passes through the housing (1) and extends into the wellbore; The scraper assembly comprises a plurality of scraper members, the plurality of scraper members being arranged at equal intervals along the circumferential direction on the upper portion of the inner wall of the housing (1), the upper portion of the housing (1) being provided with an air inlet (2), the air inlet (2) being connected to an external air source, and the scraper members being controlled by the external air source to extend and contact with the drilling tool so as to scrape the mud on the drilling tool; The grouting assembly comprises a rotor (3) and a liquid inlet (4), wherein the rotor (3) is rotatably connected to the lower part of the inner wall of the housing (1), and the two ends of the liquid inlet (4) are respectively connected to the rotor (3) and a mud pump, and drilling fluid enters the rotor (3) from the mud pump, thereby driving the rotor (3) to rotate and flush the drilling tool, and transporting the drilling fluid into the wellbore.

2. The multifunctional wellhead grouting scraper according to claim 1 is characterized in that: The scraper comprises a telescopic rod (5) fixedly connected to the upper part of the inner wall of the outer shell (1); the telescopic end of the telescopic rod (5) is fixedly connected to a cleaning block (6); the cleaning block (6) is in contact with the drilling tool; and the telescopic rod (5) is in communication with the air inlet (2).

3. The multifunctional wellhead grouting scraper according to claim 2 is characterized in that: An air delivery groove (7) is provided at the upper portion of the inner wall of the housing (1), and a hollow groove (14) is provided at the rear end of the telescopic rod (5). The hollow groove (14) is connected to the air delivery groove (7), and the air delivery groove (7) is connected to the air inlet (2).

4. The multifunctional wellhead grouting scraper according to claim 1 is characterized in that: An upper groove (8) and a lower groove (9) are respectively provided at the upper and lower parts of the outer wall of the rotor (3), and the upper groove (8) and the lower groove (9) are not connected. An infusion groove (10) is provided at the lower part of the inner wall of the housing (1), and the liquid inlet (4) is connected to the upper groove (8) through the infusion groove (10). A plurality of drainage holes (11) are provided at the lower part of the inner wall of the rotor (3), and the drainage holes (11) are connected to the lower groove (9).

5. The multifunctional wellhead grouting scraper according to claim 4 is characterized in that: A plurality of baffles (12) are fixedly connected in the circumferential direction in the upper groove (8), and the drilling fluid in the infusion tank (10) enters between two adjacent baffles (12) along the tangential direction.

6. The multifunctional wellhead grouting scraper according to claim 5 is characterized in that: The upper groove (8) and the lower groove (9) are both annular grooves, and the annular angle is 360°; The infusion groove (10) is an annular groove with an annular angle of 270°. The head end is connected to the liquid inlet (4), and the tail end is provided with a vertical groove (15) vertically downwardly along the inner wall of the shell (1). The upper part of the vertical groove (15) is connected to the infusion groove (10), and the lower part of the vertical groove (15) is connected to the lower groove (9).

7. The multifunctional wellhead grouting scraper according to claim 1 is characterized in that: The liquid inlet (4) is provided with a flow meter.

8. The multifunctional wellhead grouting scraper according to claim 2 is characterized in that: The rotor (3) is rotatably connected to the housing (1) via a bearing (13); A blocking strip (17) is provided in the middle of the inner wall of the shell (1), an upper plug (16) is provided at the upper part of the inner wall of the shell (1), and the telescopic rod (5) is fixedly connected between the upper plug (16) and the blocking strip (17); A lower plug (18) is provided at the lower portion of the inner wall of the housing (1), and the bearing (13) is located between the blocking strip (17) and the lower plug (18).

9. The multifunctional wellhead grouting scraper according to claim 5, characterized in that: The baffle (12) is an arc-shaped structure.

10. The multifunctional wellhead grouting scraper according to claim 2, characterized in that: The cleaning block (6) is a rubber block.

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