Analog golf tee with testing function

Abstract

The application discloses a simulation ball seat with a testing function, which comprises a center pipe in a variable-diameter hollow cylindrical shape, wherein one end of the center pipe is provided with a well temperature testing module, and the center pipe is sequentially provided with a dissolution testing module, a ball seat passability testing module and a casing ovality testing module in the direction away from the well temperature testing module. The simulation ball seat with the testing function can integrate the well temperature testing, the dissolution testing module, the ball seat passability testing and the casing ovality testing function together, realizes four tests in one drilling and obtains real downhole parameters. Meanwhile, the mechanical structure and the hydraulic control are adopted for testing, the mechanical mechanism conversion into an electric signal in the prior art is changed, the structure is simplified and the cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of fracturing technology in the oil and gas development process, and relates to a simulated ball seat with testing function. Background Technology

[0002] For tight oil and gas reservoir development, bridge plug perforation combined fracturing technology is currently the most effective method. The core tool of this technology is the soluble bridge plug or soluble ball seat. This tool has the following two requirements: First, the risks of obstruction and jamming during pumping are difficult to handle. It is necessary to pre-pump a simulated ball seat before pumping the actual bridge plug or ball seat to check the wellbore passability and reduce the risk of obstruction and jamming. Second, the design of the soluble ball seat or soluble bridge plug requires accurate understanding of the actual wellbore temperature, casing inner diameter ellipticity changes, and the dissolution of soluble materials during pumping. However, the current situation is as follows: ① When pumping conventional simulated soluble ball seats or bridge plugs in the field, only the tool passability can be checked. Conventional simulated ball seats cannot measure data such as wellbore temperature and casing inner diameter. ② Combined bridge plug or ball seat perforation operations require data on maximum wellbore temperature and casing deformation at the setting position. Currently, measuring wellbore temperature and casing deformation can only be done using tools such as well temperature logging and eight-arm diameter logging. These tools require full-wellbore testing and separate drilling to convert mechanical signals into electrical signals, resulting in long operation times and high costs. ③ The solubility performance testing of soluble bridge plugs and soluble ball seats can usually only be conducted indoors, which differs greatly from the actual dissolution environment of the ball seat during pumping. Therefore, there is an urgent need to design a low-cost, easy-to-operate testing tool that integrates the above testing functions and uses mechanical hydraulic control instead of electronic control, facilitating widespread application. Summary of the Invention

[0003] The purpose of this invention is to provide a simulated ball seat with testing functions, which solves the problem of insufficient research on data such as well temperature measurement, soluble material dissolution, ball seat passability, and casing inner diameter.

[0004] The technical solution adopted in this invention is a simulated ball seat with testing function, including a central tube, which is a hollow cylinder with a variable diameter. A well temperature testing module is provided at one end of the central tube, and a dissolution testing module, a ball seat passability testing module, and a casing ellipticity testing module are sequentially arranged on the central tube along the direction away from the well temperature testing module.

[0005] The invention is further characterized by:

[0006] The central tube has a strip-shaped hole at the end of its wall. The well temperature testing module includes a clamp, with a retention point thermometer held at one end of the clamp. The end of the clamp holding the retention point thermometer is inserted into the strip-shaped hole.

[0007] A sealing ring is provided at the connection between the clamp and the slotted hole.

[0008] The slotted holes are filled with shock-absorbing kerosene.

[0009] The dissolution test module includes a first dissolution test ring and a second dissolution test ring. A shoulder is provided on the central tube away from the well temperature test module. Both the first and second dissolution test rings are sleeved on the central tube, and the end face of the first dissolution test ring is connected to the shoulder.

[0010] The ball seat passability test module includes a composite material diameter test gauge, which is fitted onto the central tube. The outer wall of the composite material diameter test gauge has chamfers on both the top and bottom.

[0011] The casing ellipticity testing module includes several lead-weighted wellbore test pins and a sheath. The sheath has an "L"-shaped longitudinal section and is fitted onto the central tube. The sheath has a positioning hole, and the lead-weighted wellbore test pins are placed in the positioning hole. A variable-diameter piston is provided between the sheath and the central tube. The variable-diameter piston is fitted onto the central tube, and the outer wall of the variable-diameter piston near the bottom of the well has a chamfer. The variable-diameter piston slides in contact with the lead-weighted wellbore test pins.

[0012] The sheath is provided with a liquid inlet hole, which is located away from the ball seat passability test module from the positioning hole;

[0013] A return spring is installed between the end of the variable-diameter piston near the ball seat passability test module and the sheath, and the return spring is located on the central tube.

[0014] The beneficial effects of this invention are:

[0015] This invention provides a simulated ball seat with testing functions, integrating well temperature testing, dissolution testing, ball seat passability testing, and casing ellipticity testing into one module, enabling four tests in a single drilling run to obtain accurate downhole parameters. Furthermore, it employs a mechanical structure and hydraulic control for testing, changing the existing method of converting mechanical mechanisms into electrical signals, simplifying the structure, and reducing costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a simulated ball seat with testing function according to the present invention;

[0017] In the diagram, 1. Clamp; 2. Sealing ring; 3. Residual point thermometer; 4. Shock-absorbing kerosene; 5. Central tube; 6. First dissolution test ring; 7. Second dissolution test ring; 8. Composite material diameter test gauge; 9. Sheath; 10. Return spring; 11. Positioning hole; 12. Lead-filled well diameter test pin; 13. Return spring; 14. Variable diameter piston; 15. First sealing ring; 16. Second sealing ring; 17. Liquid inlet; 18. Connector; 19. Strip hole. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] This invention provides a simulated ball seat with testing function, such as... Figure 1 As shown, it includes a central tube 5, which is a hollow cylinder with a variable diameter. A well temperature testing module is provided at one end of the central tube 5. A dissolution testing module, a ball seat passability testing module, and a casing ellipticity testing module are sequentially arranged on the central tube 5 along the direction away from the well temperature testing module.

[0020] The central tube 5 has a strip-shaped hole 19 at its end. The well temperature testing module includes a clamp 1, with a residual point thermometer 3 clamped at its end. The end of the clamp 1 holding the residual point thermometer 3 is inserted into the strip-shaped hole 19. The residual point thermometer 3 is a glass mercury residual point thermometer. After reaching the designed position, the residual point thermometer 3 records the temperature at that point. The strip-shaped hole 19 is filled with shock-absorbing kerosene 4. A sealing ring 2 is provided at the connection between the clamp 1 and the strip-shaped hole 19 to ensure that the shock-absorbing kerosene 4 does not leak.

[0021] The dissolution test module includes a first dissolution test ring 6 and a second dissolution test ring 7. A shoulder is provided on the central tube 5 away from the well temperature test module. Both the first dissolution test ring 6 and the second dissolution test ring 7 are fitted onto the central tube 5. The end face of the first dissolution test ring 6 is connected to the shoulder. The outer diameter of the dissolution test rings 6 and 7 is the same as the outer diameter of the sealing ring of the real soluble ball seat, and they are made of the same soluble material. After the simulated ball seat is removed from the wellbore, the outer diameter of the dissolution test rings 6 and 7 after dissolution is measured respectively. Then, based on the change in outer diameter before and after entering the well and the time of entry into the well, the dissolution rate of the material per unit is calculated, providing a basis for the selection of soluble materials for soluble bridge plugs or soluble ball seats.

[0022] The ball seat passability test module includes a composite material duct gauge 8, which is fitted onto the central tube 5. The outer wall of the composite material duct gauge 8 has chamfers on both the top and bottom. The material of the composite material duct gauge 8 is a composite plastic material that can undergo permanent plastic deformation. When the drill gets stuck, it can be released by lifting it up.

[0023] The casing ellipticity testing module includes several lead-weighted wellbore test pins 12 and a sheath 9. The sheath 9 has an "L"-shaped longitudinal section and is fitted onto the central tube 5. The sheath 9 has a positioning hole 11, and the lead-weighted wellbore test pins 12 are placed inside the positioning hole 11. A variable diameter piston 14 is provided between the sheath 9 and the central tube 5. The variable diameter piston 14 is fitted onto the central tube 5. The outer wall of the variable diameter piston 14 near the bottom of the well has a chamfer. The variable diameter piston 14 slides in contact with the lead-weighted wellbore test pins 12 and slides along the surface of the variable diameter piston 14. The casing 9 is provided with a liquid inlet hole 17, which is located away from the ball seat passability test module of the positioning hole 11. A return spring 10 is set between the end of the variable diameter piston 14 near the ball seat passability test module and the casing 9. The return spring 10 is set on the central tube 5. The pressure in the wellbore acts on both sides of the variable diameter piston 14 through the liquid inlet hole 17 and the positioning hole 11 to generate a pressure difference. When the pressure in the wellbore rises to a certain value, the pressure difference is greater than the preload of the return spring 10, pushing the variable diameter piston 14 to move downward. The variable diameter piston 14 pushes the lead wellbore test pin 12 to contact the inner wall of the casing, and the length of the lead wellbore test pin 12 shortens. By measuring the degree of deformation of the lead wellbore test pin 12 caused by the casing, the inner diameter of the casing in different directions can be measured.

[0024] The areas on both sides of the variable-diameter piston 14 are S2 and S1, respectively. For example, with a maximum vertical well depth of 3500m, the net fluid column pressure is approximately 35MPa, the highest pressure during pumping is approximately 30MPa, and the bottom hole pressure during pumping is approximately 35MPa + 30MPa = 65MPa. If the wellhead pressure is set to 40MPa when the variable-diameter piston 14 begins to move, the pressure acting at the bottom hole is 40MPa + 35MPa = 75MPa. Therefore, the range of the return spring force F is:

[0025] 65(S2-S1) <F<75(S2-S1)

[0026] Meeting the above value range ensures that the variable diameter piston 14 will not move when the tool enters the well. The variable diameter piston 14 will only start to move when the wellhead pressure is greater than 40MPa.

[0027] This invention is a simulated ball seat with testing function, and its working principle is as follows:

[0028] The simulated ball seat is connected to the bottom of the simulated bridge-shooting tool string, and pumped into the wellbore to complete the drilling.

[0029] If no obstruction occurs during pumping, it indicates that the wellbore is unobstructed, and the actual soluble ball seat can also pass through the wellbore. If obstruction occurs, it indicates that the actual soluble ball seat cannot pass through, requiring subsequent wellbore treatment. In particular, if the composite material borehole test gauge 8 of the simulated ball seat gets stuck, since it is made of composite material, it can be unstuck by increasing the lifting force, avoiding a wellbore stuck accident that is difficult to handle.

[0030] After the soluble ball seat is delivered to the designed position, the flow rate is further increased, so that the pressure difference on both sides of the variable diameter piston 14 inside the wellbore is higher than the elastic force of the return spring 10, pushing the variable diameter piston 14 to move downward. The variable diameter piston 14 drives the lead well diameter test pin 12 to extend out of the sleeve 9, and deforms upon contact with the sleeve wall. The variable diameter piston 14 reaches the variable diameter step of the sleeve 9 and stops moving. The length of the lead well diameter test pin 12 is squeezed to the shortest. After the pump stops, the pressure decreases, and the variable diameter piston 14 returns to its original position under the action of the return spring 10. The lead well diameter test pin 12 also returns to its initial position under the action of the return spring 10.

[0031] When the tool string reaches the maximum position, the residual thermometer 3 will record the wellbore temperature. The dissolution test rings 6 and 7 react with the liquid in the wellbore, which is the same as the dissolution state of the actual ball seat during the pumping process.

[0032] After the tool string is pulled out of the wellbore, data such as well temperature, soluble material dissolution status, ball seat passability, and casing inner diameter can be measured by checking the wellbore temperature, soluble material dissolution status, ball seat passability, and casing inner diameter through the surface inspection thermometer 3, dissolution test rings 6 and 7 outer diameter, composite material borehole gauge 8, and lead borehole diameter test pin 12.

[0033] Example 1

[0034] like Figure 1 As shown in the figure, the simulated ball seat with testing function proposed in this embodiment includes a central tube 5, which is a hollow cylinder with a variable diameter. A well temperature testing module is provided at one end of the central tube 5. A dissolution testing module, a ball seat passability testing module, and a casing ellipticity testing module are sequentially arranged on the central tube 5 along the direction away from the well temperature testing module.

[0035] Example 2

[0036] like Figure 1 As shown in the figure, the simulated ball seat with testing function proposed in this embodiment includes a central tube 5, which is a hollow cylinder with a variable diameter. A well temperature testing module is provided at one end of the central tube 5. A dissolution testing module, a ball seat passability testing module, and a casing ellipticity testing module are sequentially arranged on the central tube 5 along the direction away from the well temperature testing module.

[0037] The central tube 5 has a strip-shaped hole 19 at the end of its tube wall. The well temperature testing module includes a clamp 1. The end of the clamp 1 holds a retention point thermometer 3. One end of the clamp 1 holding the retention point thermometer 3 is inserted into the strip-shaped hole 19.

[0038] Example 3

[0039] like Figure 1As shown in the figure, the simulated ball seat with testing function proposed in this embodiment includes a central tube 5, which is a hollow cylinder with a variable diameter. A well temperature testing module is provided at one end of the central tube 5. A dissolution testing module, a ball seat passability testing module, and a casing ellipticity testing module are sequentially arranged on the central tube 5 along the direction away from the well temperature testing module.

[0040] The central tube 5 has a strip-shaped hole 19 at the end of its tube wall. The well temperature testing module includes a clamp 1. The end of the clamp 1 holds a retention point thermometer 3. One end of the clamp 1 holding the retention point thermometer 3 is inserted into the strip-shaped hole 19.

[0041] A sealing ring 2 is provided at the connection between the clamp 1 and the strip hole 19.

[0042] Example 4

[0043] like Figure 1 As shown in the figure, the simulated ball seat with testing function proposed in this embodiment includes a central tube 5, which is a hollow cylinder with a variable diameter. A well temperature testing module is provided at one end of the central tube 5. A dissolution testing module, a ball seat passability testing module, and a casing ellipticity testing module are sequentially arranged on the central tube 5 along the direction away from the well temperature testing module.

[0044] The central tube 5 has a strip-shaped hole 19 at the end of its tube wall. The well temperature testing module includes a clamp 1. The end of the clamp 1 holds a retention point thermometer 3. One end of the clamp 1 holding the retention point thermometer 3 is inserted into the strip-shaped hole 19.

[0045] A sealing ring 2 is provided at the connection between the clamp 1 and the strip hole 19.

[0046] The slot 19 is filled with damping kerosene 4.

Claims

1. A simulated ball stand with testing function, characterized in that, Includes a central tube (5), which is a hollow cylinder with a variable diameter. A well temperature testing module is provided at one end of the central tube (5). A dissolution testing module, a ball seat passability testing module, and a casing ellipticity testing module are sequentially provided on the central tube (5) along the direction away from the well temperature testing module. The casing ellipticity testing module includes several lead-weighted wellbore test pins (12) and a sheath (9). The sheath (9) has an "L-shaped" longitudinal section and is fitted onto the central tube (5). The sheath (9) has a positioning hole (11) and the lead-weighted wellbore test pins (12) are set in the positioning hole (11). A variable diameter piston (14) is provided between the sheath (9) and the central tube (5). The variable diameter piston (14) is fitted onto the central tube (5). The outer wall of the variable diameter piston (14) near the bottom of the well has a chamfer. The variable diameter piston (14) slides in contact with the lead-weighted wellbore test pins (12). The sheath (9) is provided with a liquid inlet hole (17), which is located away from the ball seat passability test module of the positioning hole (11); A return spring (10) is provided between the end of the variable diameter piston (14) near the ball seat passability test module and the sheath (9), and the return spring (10) is provided on the central tube (5).

2. The simulated ball stand with testing function according to claim 1, characterized in that, The central tube (5) has a strip hole (19) at the end of its wall. The well temperature testing module includes a clamp (1). The end of the clamp (1) holds a retention point thermometer (3). The end of the clamp (1) holding the retention point thermometer (3) is inserted into the strip hole (19).

3. The simulated ball stand with testing function according to claim 2, characterized in that, A sealing ring (2) is provided at the connection between the clamp (1) and the strip hole (19).

4. The simulated ball stand with testing function according to claim 2, characterized in that, The strip-shaped hole (19) is filled with shock-absorbing kerosene (4).

5. The simulated ball stand with testing function according to claim 1, characterized in that, The dissolution test module includes a first dissolution test ring (6) and a second dissolution test ring (7). The central tube (5) is provided with a shoulder at a location away from the well temperature test module. Both the first dissolution test ring (6) and the second dissolution test ring (7) are sleeved on the central tube (5). The end face of the first dissolution test ring (6) is connected to the shoulder.

6. The simulated ball stand with testing function according to claim 1, characterized in that, The ball seat passability test module includes a composite material diameter test gauge (8), which is fitted onto the central tube (5). The outer wall of the composite material diameter test gauge (8) has chamfers on both the top and bottom.

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