Drilling fluid inside-in and inside-out type petroleum drilling system

Abstract

The petroleum drilling system comprises a base, the base is horizontally placed on the ground, a through hole is formed in the middle of the base, a transverse plate is arranged above the base in a lifting mode, a first motor is arranged above the transverse plate, and an outer pipe is arranged below the transverse plate; the top of the outer pipe is connected with an output shaft of the first motor pair, a drill bit is arranged at the bottom of the outer pipe, and a hole channel is formed in the drill bit in a penetrating mode and communicates with the outer pipe. An inner pipe is arranged on the inner side of the outer pipe, a plurality of adjusting assemblies are arranged below the inner pipe, each adjusting assembly is connected with the inner side wall of the outer pipe, and the size of an opening in the upper end of a space formed by the adjusting assemblies is larger than that of an opening in the lower end of the space. A water pump and a liquid tank are further arranged on the base; the water pump can control the liquid tank to enable drilling fluid to enter and exit from the inner pipe and the outer pipe; by replacing the manufacturing material of the inner pipe, the overall mass of the inner pipe is lighter, and then the fixing degree of the plug pin to the inner pipe is improved.

Description

Technical Field

[0001] This invention relates to the field of oil drilling and production technology, specifically to an internal inlet and outlet type oil drilling system for drilling fluid. Background Technology

[0002] A narrow drilling fluid density window can easily lead to wellbore instability, lost circulation reservoir damage, and other complex drilling issues, severely restricting the development speed and economic benefits of oil and gas resources. The problems caused by a narrow drilling fluid density window bring significant difficulties and risks to actual operations. The factors affecting the drilling fluid density window are mainly threefold: first, formation characteristics, primarily related to geological conditions; second, engineering design, as unreasonable engineering design can increase drilling difficulty and create a narrow density window; and third, drilling operations, such as excessively fast tripping speeds causing excessive suction and pulsation pressure, excessive annular reaction velocity, and prolonged wellbore exposure time. Therefore, it is necessary to widen the drilling fluid density window, reduce annular pressure loss, and precisely control circulating pressure loss to ensure normal drilling.

[0003] To address the aforementioned issues, Chinese patent CN108316892B discloses an internal-inlet / internal-outlet oil drilling system, comprising a drilling rig, a drilling fluid inlet tank, a drilling fluid pressurizing pump, a drilling fluid recovery pump, a drilling fluid recovery tank, a wellhead blowout preventer, a drill pipe assembly, a formation sealing cylinder, and a drill bit. The drill pipe assembly includes several drill pipe units connected in sequence. Each drill pipe unit has a drill pipe baffle inside, with both its front and rear sides in sealed contact with the inner wall of the drill pipe unit. The drill pipe baffle is fixed inside the drill pipe unit by a baffle fixing assembly. Drill pipe baffles located in different drill pipe units are connected by baffle connecting assemblies. The drill pipe baffle divides the interior of the drill pipe assembly into a drilling fluid outlet channel on the left and a drilling fluid inlet channel on the right. This device, relying on the action of the drilling fluid recovery pump and the drilling fluid pressurizing pump, enables the drilling fluid to be input and output within the drill pipe assembly, avoiding significant drilling fluid loss and simultaneously recycling the drilling fluid, thus reducing drilling costs.

[0004] However, when the above-mentioned device recycles drilling fluid, the drilling fluid needs to enter the formation sealing cylinder from the drill bit working part in the space below the formation sealing cylinder through the three first drilling fluid exchange holes of the formation sealing cylinder, and then enter the drill bit fixing rod through the second drilling fluid exchange hole set on the left semicircle of the drill bit fixing rod, and be pumped out into the drilling fluid recovery tank along the drilling fluid output channel. The process and structure of the above-mentioned device for recycle drilling fluid are relatively complex. Therefore, it is necessary to propose a drilling fluid internal inlet and internal outlet type oil drilling system with a simple structure, which changes the hydraulic pressure by changing the cross-sectional area, and adjusts the flow rate and flow direction of the drilling fluid by changing the hydraulic pressure, thereby realizing the recycling of drilling fluid. Summary of the Invention

[0005] The purpose of this invention is to provide an internal inlet and outlet drilling fluid oil drilling system, which aims to improve the problems mentioned in the background art.

[0006] The present invention is implemented as follows: an internal inlet and internal outlet drilling fluid oil drilling system includes a base, which is placed flat on the ground and has a through hole in the middle. A horizontal plate is raised and lowered above the base, and a first motor is installed above the horizontal plate and an outer pipe is installed below it. The top of the outer pipe is connected to the output shaft of the first motor, and a drill bit is installed at the bottom. The drill bit has a through hole and is connected to the outer pipe. An inner pipe is installed inside the outer pipe, and multiple sets of adjustment components are installed below the inner pipe. Each set of adjustment components is connected to the inner wall of the outer pipe, and the upper opening of the space formed by the multiple sets of adjustment components is larger than the lower opening. A water pump and a fluid tank are also installed on the base. The water pump can control the fluid tank to allow drilling fluid to enter and exit the inner and outer pipes.

[0007] Preferably, the adjustment assembly includes a first rod, a connecting plate, and a third rod. The connecting plate is inclined. The adjacent ends of the first rod and the second rod are connected to the upper and lower ends of the connecting plate, respectively, and the opposite ends are connected to the inner side of the outer tube.

[0008] Preferably, multiple balls are embedded on the outer side of the inner tube, and multiple groups of balls are arranged vertically. In each group, multiple balls are evenly distributed along the circumference of the inner tube. Multiple pins are fixedly provided on the inner side wall of the outer tube, and multiple groups of pins are arranged vertically. In each group, multiple pins are evenly distributed along the circumference of the outer tube.

[0009] Preferably, multiple sets of balls are aligned with multiple sets of pins, and the balls are in contact with the pins.

[0010] Preferably, the liquid tank is provided with an inlet tank and a return tank, which are located on the outside of the outer tube. A first water pump and a second water pump are respectively provided on the side of the inlet tank and the return tank.

[0011] Preferably, the inlet tank is connected to the input end of the first water pump, and the output end of the first water pump is connected to the inner pipe; the return tank is connected to the output end of the second water pump, and the input end of the second water pump is connected to the outer pipe.

[0012] Preferably, a second motor is provided above the base, the second motor is inverted, and a screw is fixedly connected to the output shaft, with the screw thread passing through the end of the horizontal plate.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The drilling fluid internal inlet and internal outlet type oil drilling system of the present invention, by changing the material of the inner tube, makes the overall weight of the inner tube lighter, thereby improving the fixation of the pin on the inner tube.

[0015] 2. The drilling fluid internal inlet and internal outlet type oil drilling system of the present invention optimizes the shape of the components. During drilling, firstly, the threads on the outer wall of the drill bit make it easier for the drill bit to penetrate into the bottom layer. Secondly, the operator can more intuitively observe the drilling depth through the threads on the outer tube, which is convenient for the user to adjust at any time. Finally, the groove opened on the top of the base increases the stability of placing the inlet tank and the return tank, thereby improving the overall work efficiency.

[0016] 3. The drilling fluid internal inlet and internal outlet type oil drilling system of the present invention, by setting a sealing plate, reduces the outflow of drilling fluid to a certain extent, avoids unnecessary waste of drilling fluid, and thus improves the utilization rate of drilling fluid.

[0017] 4. The drilling fluid inlet and outlet type oil drilling system of the present invention, by setting a support component, limits the top and bottom positions of the screw when the second motor drives the screw to rotate, so as to avoid the screw from shaking and thus increase the stability of the screw during rotation to a certain extent. Attached Figure Description

[0018] Figure 1 This is a front view of an embodiment of the present invention.

[0019] Figure 2 This is a cross-sectional view of the outer tube and the drill bit.

[0020] In the diagram: 1. Stratum; 2. Base; 3. Bracket; 4. First motor; 5. Second motor; 6. Screw; 7. Fixing frame; 8. Inlet tank; 9. Return tank; 10. First water pump; 11. Second water pump; 12. Horizontal plate; 13. Outer pipe; 14. Inner pipe; 15. Drill bit; 16. Pin; 17. Ball bearing; 18. First rod; 19. Connecting plate; 20. Third rod. Detailed Implementation

[0021] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0023] Example 1

[0024] The basic implementation examples are as follows: Figure 1-2 As shown:

[0025] An internal inlet and outlet type oil drilling system includes a formation 1 and a base 2 placed on top of the formation 1, with an opening in the middle of the base 2.

[0026] The top two ends of the base 2 are symmetrically connected to a second motor 5 along the vertical direction and fixed by bolts. The output shafts of the second motors 5 are all coaxially fixed to screws 6 by bolts. The outer side of the second motors 5 is fitted with a support assembly (the support assembly here can be a cylinder, the second motor 5 is located inside the cylinder, and the output shaft of the second motor 5 passes through the cylinder). A horizontal plate 12 is provided above the base 2. The screws 6 pass through both ends of the horizontal plate 12 and are threaded to the horizontal plate 12. The top of the horizontal plate 12 is fixed to a first motor 4 by bolts. The output shaft of the first motor 4 passes through the middle of the horizontal plate 12 and is coaxially fixed to an outer tube 13 by bolts. The end of the outer tube 13 away from the first motor 4 is fixed to a drill bit 15 by bolts. The preferred model of the first motor 4 and the second motor 5 is 80KTYZ.

[0027] The base 2 has an inlet tank 8, a first water pump 10, a second water pump 11 and a return tank 9 on top. The inlet tank 8 is connected to the input end of the first water pump 10; the return tank 9 is connected to the output end of the second water pump 11, and the output end of the second water pump 11 is connected to the outer pipe 13. The preferred models of the first water pump 10 and the second water pump 11 are SP-5000.

[0028] The inner wall of the outer tube 13 is integrally formed with several pins 16 along its circumference. An inner tube 14 is provided inside the outer tube 13. The output end of the first water pump 10 is connected to the inner tube 14, and the bottom of the inner tube 14 is connected to the outer tube 13. Several balls 17 are embedded and rotatably fitted into the side wall of the inner tube 14 along its circumference. Each ball 17 abuts against the adjacent pin 16. Several sets of adjustment components are provided on the inner wall of the outer tube 13 along its circumference. The adjustment components are all located below the inner tube 14. The adjustment components include a first rod 18. One end of the first rod 18 is hinged to the inner wall of the outer tube 13. The other end of the first rod 18 is hinged to a connecting plate 19. A third rod 20 is hinged to the end of the connecting plate 19 away from the first rod 18. The end of the third rod 20 away from the connecting plate 19 is welded to the inner wall of the outer tube 13. The first rod 18, the connecting plate 19, the third rod 20 and the inner wall of the outer tube 13 are polygonal in structure.

[0029] The specific implementation process is as follows:

[0030] During drilling, the first motor 4 and the second motor 5 are started simultaneously, with the second motor 5 rotating forward. The forward rotation of the second motor 5 drives the screw 6 to rotate, which in turn drives the horizontal plate 12 to move downwards, thereby moving the outer tube 13 and the drill bit 15 downwards. Simultaneously, the first motor 4 drives the outer tube 13 and the drill bit 15 to rotate. Driven by the first motor 4 and the second motor 5, the outer tube 13 and the drill bit 15 move downwards while rotating, allowing the drill bit 15 to drill a channel within the formation 1. Since the first rod 18 inside the outer tube 13 is hinged to the inner wall of the outer tube 13, and the first rod 18 is hinged to the connecting plate 19, the distance between adjacent connecting plates 19 gradually decreases from top to bottom. Then, the first water pump 10 can be turned on, and the first water pump 10 delivers drilling fluid from the inlet tank 8 to the inner tube 14. When the drilling fluid flows to the regulating component, the distance between adjacent connecting plates 19 gradually decreases from top to bottom. The diameter of the drilling fluid gradually decreases from top to bottom, while the cross-sectional area decreases. The flow rate remains constant, but the flow velocity increases. Therefore, when the drilling fluid reaches the regulating component, the flow velocity gradually increases, thereby increasing the speed at which the drilling fluid is delivered to the drill bit 15 to a certain extent. The drilling fluid is then delivered into the channel through the drill bit 15. The drilling fluid can clean the bottom of the well, keep the bottom clean, cool and lubricate the drill bit 15, reduce the temperature of the drill bit 15, reduce wear on the drill bit 15, and improve the service life of the drill bit 15. It can also balance the rock side pressure of the well wall, preventing pollution of the oil and gas reservoir and well wall collapse. When the outer tube 13 rotates, the pin 16 on the inner wall of the outer tube 13 rotates with the outer tube 13. Since the pin 16 abuts against the ball 17, the pin 16 will drive the ball 17 to rotate on the inner tube 14 when it rotates. The pressing force applied by the pin 16 to the ball 17 keeps the position of the inner tube 14 inside the outer tube 13 basically unchanged.

[0031] When drilling fluid needs to be pumped back, the first motor 4 and the second motor 5 are started simultaneously again, with the second motor 5 rotating forward. Under the drive of the first motor 4 and the second motor 5, the outer tube 13 and the drill bit 15 move downward and rotate again. Then, the second water pump 11 is turned on to pump back the drilling fluid. Since the distance between adjacent connecting plates 19 gradually decreases from top to bottom, the hydraulic pressure at the bottom of the adjacent connecting plates 19 is the largest when pumping back the drilling fluid, while the hydraulic pressure in the gap between the adjacent third rods 20 is smaller. To balance the hydraulic pressure, the drilling fluid will move towards the area with lower hydraulic pressure. Under the suction of the second water pump 11, most of the drilling fluid will flow into the outer tube 13 into the gap between the adjacent third rods 20 and the gap between the adjacent first rods 18, and then be transported to the return tank 9, thereby recycling the drilling fluid.

[0032] Example 2

[0033] The difference from the above embodiment is that: a sealing plate is fixedly connected to the opening by bolts, and one end of the outer tube 13 with a drill bit 15 extends through the sealing plate into the formation 1.

[0034] The specific implementation process is as follows: When drilling fluid is delivered to the formation 1, the drilling fluid may flow onto the base 2 through the opening, resulting in waste of drilling fluid. The sealing plate can prevent the drilling fluid from flowing out of the opening to a certain extent.

[0035] Example 3

[0036] The difference from the above embodiment is that the support assembly includes a trapezoidal fixed frame 7, the output shaft of the second motor 5 passes through the middle of the top of the fixed frame 7, and the bottom of the fixed frame 7 is fixedly connected to the top of the base 2 by bolts.

[0037] The specific implementation process is as follows: When the second motor 5 drives the screw 6 to rotate, the bottom of the screw 6 may shake. The fixing frame 7 can limit the bottom of the screw 6 to a certain extent, thereby increasing the stability of the bottom of the screw 6 when rotating.

[0038] Example 4

[0039] The difference from the above embodiment is that: the top of the base 2 is fixedly connected to the U-shaped bracket 3 by bolts, and the end of the screw 6 away from the second motor 5 is rotatably engaged with the bottom of the horizontal end of the bracket 3.

[0040] The specific implementation process is as follows: When the second motor 5 drives the screw 6 to rotate, the top of the screw 6 may shake. The bracket 3 can limit the top of the screw 6 to a certain extent, thereby increasing the stability of the top of the screw 6 when rotating.

[0041] Example 5

[0042] The difference from the above embodiment is that the outer side wall of the drill bit 15 is threaded.

[0043] The specific implementation process is as follows: During drilling, the threads on the drill bit 15 can facilitate the drill bit 15 to penetrate deep into the formation 1, thereby improving drilling efficiency to a certain extent.

[0044] Example 6

[0045] The difference from the above embodiment is that the outer wall of the outer tube 13 is engraved with scale lines.

[0046] The specific implementation process is as follows: Users can observe the drilling depth through the scale lines, which is more intuitive and makes it easier for users to adjust in a timely manner according to the actual situation.

[0047] Example 7

[0048] The difference from the above embodiment is that the inner tube 14 is made of aluminum-magnesium material.

[0049] The specific implementation process is as follows: Since the inner tube 14 is basically fixed inside the outer tube 13 by the compression of the ball 17 by the pin 16, and the magnesium-aluminum material is relatively light, the weight of the inner tube 14 is small, which makes it easier for the pin 16 to fix the inner tube 14 to a certain extent.

[0050] Example 8

[0051] The difference from the above embodiment is that the top of the base 2 has several grooves for placing the liquid inlet tank 8 and the liquid return tank 9.

[0052] The specific implementation process is as follows: The groove can limit the liquid inlet tank 8 and the liquid return tank 9 to a certain extent, thereby increasing the stability when placing the liquid inlet tank 8 and the liquid return tank 9.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A drilling fluid inlet / outlet type oil drilling system, characterized in that, The system includes a base (2) which is placed flat on the ground and has a through hole in the middle. A horizontal plate (12) is mounted on the base (2) and can be raised and lowered. A first motor (4) is mounted on the horizontal plate (12) and an outer tube (13) is mounted below it. The top of the outer tube (13) is connected to the output shaft of the first motor (4) and a drill bit (15) is mounted at the bottom. The drill bit (15) has a through hole and is connected to the outer tube (13). An inner tube (14) is mounted inside the outer tube (13). Multiple sets of adjustment components are mounted below the inner tube (14). Each set of adjustment components is connected to the inner wall of the outer tube (13), and the upper opening of the space formed by the multiple sets of adjustment components is larger than the lower opening. A water pump and a liquid tank are also mounted on the base (2). The water pump can control the liquid tank to allow drilling fluid to enter and exit the inner tube (14) and the outer tube (13).

2. The drilling fluid internal inlet and internal outlet type oil drilling system according to claim 1, characterized in that, The adjustment assembly includes a first rod (18), a connecting plate (19), and a third rod (20). The connecting plate (19) is inclined. The ends of the first rod (18) and the second rod that are adjacent to each other are connected to the upper and lower ends of the connecting plate (19), respectively, and the ends that are far apart from each other are connected to the inner side of the outer tube (13).

3. The drilling fluid internal inlet and internal outlet type oil drilling system according to claim 2, characterized in that, Multiple balls (17) are embedded on the outer side of the inner tube (14). Multiple balls (17) are arranged in multiple groups, and multiple balls (17) in each group are evenly distributed along the circumference of the inner tube (14). Multiple pins (16) are fixedly provided on the inner side wall of the outer tube (13). Multiple pins (16) are arranged in multiple groups, and multiple pins (16) in each group are evenly distributed along the circumference of the outer tube (13).

4. The drilling fluid internal inlet and internal outlet type oil drilling system according to claim 3, characterized in that, Multiple sets of ball bearings (17) are aligned with multiple sets of pins (16), and the ball bearings (17) are in contact with the pins (16).

5. The drilling fluid internal inlet and internal outlet type oil drilling system according to claim 1, characterized in that, The liquid tank is provided with an inlet tank (8) and a return tank (9), which are located on the outside of the outer tube (13). A first water pump (10) and a second water pump (11) are respectively provided on the side of the inlet tank (8) and the return tank (9).

6. The drilling fluid internal inlet and internal outlet type oil drilling system according to claim 5, characterized in that, The inlet tank (8) is connected to the input end of the first water pump (10), and the output end of the first water pump (10) is connected to the inner tube (14); the return tank (9) is connected to the output end of the second water pump (11), and the input end of the second water pump (11) is connected to the outer tube (13).

7. The drilling fluid internal inlet and internal outlet type oil drilling system according to claim 1, characterized in that, A second motor (5) is provided above the base (2). The second motor (5) is inverted and a screw (6) is fixedly connected to the output shaft. The screw (6) is threaded through the end of the horizontal plate (12).

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