Full-shaft jam releasing instrument experimental device and experimental method

Abstract

The invention provides an experimental device and an experimental method for a whole shaft jam freeing instrument, the device comprises a base, a simulation shaft outer barrel, a simulation shaft inner barrel, a motor, a support mechanism, a filtrate collection mechanism, a driving and power transmission mechanism, a liquid storage mechanism, a data processing mechanism and a pressurization mechanism, the simulation shaft outer barrel is arranged on the base through the support mechanism; a plurality of filtrate collecting mechanisms are arranged at the lower end of the simulation shaft outer barrel, and the two ends of the simulation shaft outer barrel are in sealed connection through an outer barrel bottom plate and an outer barrel top plate correspondingly; the simulation shaft inner barrel is connected into the simulation shaft outer barrel through the inner barrel connecting mechanism; and a movable filtration platform is arranged at the bottom of the simulation shaft outer cylinder. According to the invention, not only can wellbore jamming and jam releasing be truly simulated, but also the jam releasing force and the jam releasing time can be accurately measured. The underground operation condition can be truly simulated, and the adhesion coefficient and torque change between a drilling tool in a borehole and a well wall filter cake are monitored, so that the performance of drilling fluid can be adjusted in time, and drilling tool jamming accidents are prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of performance testing of a jam-releasing fluid in the oil and gas industry, and in particular relates to an experimental device and a test method for a full-wellbore jam-releasing instrument. Background Art

[0002] With the increase in the number of deep wells, high-angle wells, and horizontal wells during oil exploration and development, and the long open hole section and multiple formations during drilling construction, when the drill bit is stationary, the drill bit will adhere to the filter cake on the well wall under the action of pressure difference, and the longer the stationary time, the larger the contact area, which will eventually lead to a significant increase in the probability of drill bit sticking. Drill bit sticking will seriously restrict drilling safety and drilling cycle, causing serious economic losses. When the drill bit is stuck, it is usually unstuck by soaking the stuck point with a release fluid. The oil and surfactant in the release fluid can change the wetting state between the drill bit and the filter cake, reduce the interfacial tension, and allow the release fluid to penetrate into the interface between the filter cake and the drill bit. The oil can form an oil film at the interface between the drill bit and the filter cake, reducing the adhesion coefficient and friction coefficient. In addition, the water phase in the release fluid has a high mineralization degree, and the osmotic pressure is used to dehydrate the clay particles, thereby thinning the filter cake and generating cracks, destroying the filter cake structure, and reducing the contact area between the filter cake and the drill bit, achieving unstuck.

[0003] There are currently two mainstream methods for evaluating the performance of unstuck fluids. The first is a qualitative evaluation method described in the Technical Requirements for Unstuck Agents for Drilling Fluids (Q / CNPC 87-2003), where the filter cake is soaked in unstuck fluid for 30 minutes under medium pressure, and the degree of damage to the filter cake after soaking is observed, specifically, the number and size of the network cracks formed; the second is a quantitative evaluation method, where an unstuck fluid analyzer is used to directly measure the unstuck force under high pressure and the time required for unstuck. However, the current commercial unstuck fluid analyzer is based on the API filtration test and is equipped with an adhesion disk to simulate the stuck drill phenomenon, and the filter cake adhesion coefficient is manually measured at intervals using a torque meter to further calculate the torque change. It has the disadvantages of complex operation, low safety, large experimental error, and low fit with the drilling site, and lacks an effective evaluation method. Summary of the invention

[0004] In order to overcome the problems of the existing structures and methods, such as complex operation, low safety, large experimental errors, low fit with the drilling site, and lack of effective evaluation methods, the present invention provides a full-wellbore jam-release instrument experimental device and test method. The present invention can truly simulate downhole operations, monitor the adhesion coefficient and torque changes between the drill bit and the filter cake on the wellbore, so as to adjust the drilling fluid performance in time and prevent the occurrence of drill jam accidents. At the same time, the present invention can detect the jam-release force and jam-release time on the basis of detecting the filter cake adhesion coefficient, thus achieving the purpose of one machine with multiple uses. The present invention has high simulation, simple structure, high test accuracy, and is easy to operate, safe and reliable, and has good prospects for promotion and application in scientific research and drilling site operations.

[0005] The technical solution adopted by the present invention is: A full wellbore jam-releasing instrument experimental device comprises a base, a simulated wellbore outer cylinder, a simulated wellbore inner cylinder, a motor, a supporting mechanism, a filtrate collecting mechanism, a driving and power transmission mechanism, a liquid storage mechanism, a data processing mechanism and a pressurizing mechanism. The simulated wellbore outer cylinder is arranged on the base through the supporting mechanism, a plurality of filtrate collecting mechanisms are arranged at the lower end of the simulated wellbore outer cylinder, and the two ends of the simulated wellbore outer cylinder are respectively sealed and connected through the outer cylinder bottom plate and the outer cylinder top plate; the simulated wellbore inner cylinder is connected to the simulated wellbore outer cylinder through the inner cylinder connecting mechanism; a movable filtration loss platform is arranged at the bottom of the simulated wellbore outer cylinder; a filter cake is arranged on the movable filtration loss platform; The motor is arranged on the base, and the upper end of the motor is connected to the movable filtration platform through a connecting shaft; The driving and power transmission mechanism is arranged on the top plate of the outer tube and connected to the inner tube of the simulated wellbore; the data processing mechanism is connected to the driving and power transmission mechanism by electrical signals; The liquid storage mechanism is arranged on one side of the base, and the liquid storage mechanism is connected to the top plate of the outer tube through a liquid inlet pipe and a liquid outlet pipe; the liquid inlet pipe passes through the top cover plate of the outer tube and communicates with the inside of the inner tube of the simulated wellbore, and the liquid outlet pipe passes through the top cover plate of the outer tube and communicates with the annulus of the outer tube of the simulated wellbore and the inner tube of the simulated wellbore; The pressurizing mechanism is arranged on the bottom plate of the outer tube, and an exhaust valve is arranged on the bottom cover plate of the outer tube, and the exhaust valve is communicated with the inside of the outer tube of the simulated wellbore.

[0006] The filtrate collecting mechanism includes a filtrate outlet, a filtrate guide pipe and a filtrate collecting box. The filtrate collecting box is arranged on the outer wall of the lower end of the outer tube of the simulated wellbore. The filtrate outlet corresponds to the filtrate collecting box one by one. A filtrate guide pipe is provided at the filtrate outlet, and the lower end of the filtrate guide pipe is located in the filtrate collecting box. The support mechanism includes a bracket and a wellbore inclination adjustment rod, which are respectively fixed vertically on both sides of the base; the two ends of the simulated wellbore outer tube are horizontally fixed on the base through the support rod and the wellbore inclination adjustment rod.

[0007] The inner tube connection mechanism comprises an inner tube bracket and an inner tube bracket lifting ring; the inner tube bracket is vertically fixedly connected to the upper inner wall of the simulated wellbore outer tube, the bottom end of the inner tube bracket is connected to the inner tube bracket lifting ring, and the simulated wellbore inner tube is fixed to the inside of the simulated wellbore outer tube through the inner tube bracket lifting ring.

[0008] The driving and power transmission mechanism comprises a stirring motor and a coupling, wherein the outer end of the coupling is connected to the stirring motor disposed outside the outer tube of the simulated wellbore, and the inner end of the coupling is connected to one end of the inner tube of the simulated wellbore.

[0009] The liquid storage mechanism includes an infusion pump, an infusion pump control panel, a liquid storage tank and a tank body. The infusion pump is arranged in the liquid storage tank, and the infusion pump control panel is arranged on the outer wall of the tank body; the opening of the infusion pump is controlled by the infusion pump control panel 29; the infusion pump is connected to the liquid inlet pipe.

[0010] The pressurizing mechanism includes an air source pressure divider and an air intake valve; one end of the air intake valve penetrates the bottom cover of the outer tube and communicates with the inside of the outer tube of the simulated wellbore, and the other end of the air intake valve is connected to the air source pressure divider.

[0011] The data processing mechanism at least includes a computer, and the computer is connected to the stirring motor in the driving and power transmission mechanism through a torque sensor, and can detect the torque change at the bottom of the inner tube of the simulated wellbore in real time.

[0012] The outer tube of the simulated wellbore is a hollow cylinder made of transparent material with open ends; the movable filtration platform is a semi-cylindrical structure, and a plurality of filtration channels are distributed on the movable filtration platform at equal intervals.

[0013] A test method for a full wellbore jammer experimental device comprises the following steps: Step 1: Check whether the gas source and pressure gauge are working safely and reliably; Step 2: Place the movable filtration platform at the bottom of the outer cylinder of the simulated wellbore through a motor, install the bottom cover plate and the top cover plate of the outer cylinder, and connect the pressurizing mechanism to the external gas source; Step 3: Adjust the wellbore inclination adjustment rod to adjust the outer tube of the simulated wellbore to the inclination angle required for the experimental test; Step 4: Inject drilling fluid into the fluid storage tank. First, operate the fluid pump at a displacement of 4-10 L / s to fill the outer tube and inner tube of the simulated wellbore with drilling fluid, and establish a circulation cycle of the drilling fluid. Step 5: Turn on the stirring motor to drive the inner cylinder of the simulated wellbore to rotate, so that the speed of the inner cylinder of the simulated wellbore reaches the speed required by the experiment; Step 6: Open the gas source pressure divider and the air inlet valve to make the pressure of the annulus of the simulated wellbore outer tube and the simulated wellbore inner tube reach the preset value of the experiment, and further adjust the displacement of the infusion pump to the displacement required by the experiment; Step 7: Open the valve on the filtrate diversion pipe, and after the pressure difference acts for 30 minutes, let the filtrate flow into the filtrate collection box through the filtrate outlet; Step 8: The stirring motor stops operating to stop the rotation of the inner cylinder of the simulated wellbore; the motor is turned on to apply pressure to raise the movable filter loss platform and the filter cake formed on its upper part to the bottom of the inner cylinder of the simulated wellbore for compaction to simulate the process of the drill bit being stuck at the drilling site; Step 9: The torque change at the bottom of the simulated wellbore inner tube is transmitted to the computer in real time through the torque sensor for data processing, and the motor 20 is turned off after the torque reaches the maximum value and remains stable; Step 10: Inject the unstuck liquid to be tested into the liquid storage tank. First, operate the infusion pump at a displacement of 4-10 L / s to fill the outer cylinder and the inner cylinder of the simulated wellbore with the unstuck liquid to be tested, and establish a circulation cycle of the unstuck liquid. Step 11: Repeat step 6, open the pressurizing mechanism, and further adjust the displacement of the infusion pump to the displacement required for the experiment; Step 12: Close the valve on the filtrate diversion pipe, and the torque change at the bottom of the inner tube of the simulated wellbore is transmitted to the computer in real time through the torque sensor for data processing, and the time when the torque at the bottom of the inner tube of the simulated wellbore reaches the minimum value and remains stable is recorded, that is, the jamming release time; Step 13: After the inner tube of the simulated wellbore is completely unstuck, open the exhaust valve to release the pressure in the wellbore; discharge the unstuck fluid to be tested; close the torque sensor; start the motor to lower the movable filtration platform to the bottom of the outer tube of the simulated wellbore, and open the bottom cover plate and the top cover plate of the outer tube to clean the unstuck instrument.

[0014] Beneficial effects of the present invention: (1) The present invention can conduct an evaluation test on the unstuck force and unstuck time of a drilling tool by a unstuck fluid, thereby overcoming the shortcomings of existing unstuck fluid analyzers, such as complex operation, low safety, large experimental errors, and low compatibility with the drilling site, and making up for the shortcomings of on-site production.

[0015] (2) The outer tube of the simulated wellbore of the present invention is made of a transparent material that is resistant to high temperature and high pressure, and the formation of filter cakes, the occurrence of drill bit sticking, and the process of removing the stuck drill bit can be observed visually.

[0016] (3) The data processing mechanism of the present invention can accurately and in real time reflect the torque changes when the drill tool is stuck or unstuck.

[0017] (4) The present invention has high simulation degree, simple operation, stable performance, high accuracy and simple structure, which is conducive to popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Figure 1It is a schematic diagram of the structure of the device of the present invention.

[0020] In the figure, the reference numerals are: 1. Simulated wellbore outer tube; 2. Simulated wellbore inner tube; 3. Inner tube coupling; 4. Inner tube bracket; 5. Inner tube bracket lifting ring; 6. Outer tube bottom plate; 7. Outer tube top plate; 8. Coupling; 9. Stirring motor; 10. Exhaust valve; 11. Air source pressure divider; 12. Inlet valve; 13. Nozzle; 14. Filtrate outlet; 15. Filtrate guide tube; 16. Filtrate collection box; 17. Movable filtration loss platform; 18. Filter cake; 19. Connecting shaft; 20. Motor; 21. Bracket; 22. Wellbore inclination adjustment rod; 23. Base; 24. Liquid inlet pipe; 25. Liquid outlet pipe; 26. Torque sensor; 27. Computer; 28. Infusion pump; 29. ​​Infusion pump control panel; 30. Liquid storage tank; 31. Tank body; 32. Motor control panel. DETAILED DESCRIPTION

[0021] 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 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.

[0022] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0023] Embodiment 1: In order to overcome the problems of the existing structures and methods, such as complex operation, low safety, large experimental errors, low degree of fit with the drilling site, and lack of effective evaluation methods, the present invention provides Figure 1 The full-wellbore jam-release instrument experimental device and test method shown in the figure can truly simulate downhole operation conditions, monitor the adhesion coefficient and torque changes between the drill bit and the filter cake on the wellbore wall, so as to adjust the drilling fluid performance in time and prevent the occurrence of drill jam accidents. At the same time, the present invention can detect the jam-release force and jam-release time on the basis of detecting the filter cake adhesion coefficient, thus achieving the purpose of one machine with multiple uses. The present invention has high simulation degree, simple structure, high test accuracy, and is easy to operate, safe and reliable, and has good promotion and application prospects in scientific research and drilling site operations.

[0024] like Figure 1 As shown, a full wellbore jammer experimental device comprises a base 23, a simulated wellbore outer tube 1, a simulated wellbore inner tube 2, a motor 20, a support mechanism, a filtrate collecting mechanism, a driving and power transmission mechanism, a liquid storage mechanism, a data processing mechanism and a pressurizing mechanism. The simulated wellbore outer tube 1 is arranged on the base 23 through the support mechanism, a plurality of filtrate collecting mechanisms are arranged at the lower end of the simulated wellbore outer tube 1, and the two ends of the simulated wellbore outer tube 1 are respectively sealed and connected through the outer tube bottom plate 6 and the outer tube top plate 7; the simulated wellbore inner tube 2 is connected to the simulated wellbore outer tube 1 through the inner tube connecting mechanism; a movable filtration loss platform 17 is arranged at the bottom of the simulated wellbore outer tube 1; and a filter cake 18 is arranged on the movable filtration loss platform 17; The motor 20 is arranged on the base 23, and the upper end of the motor 20 is connected to the movable filtration platform 17 through the connecting shaft 19; The driving and power transmission mechanism is arranged on the outer tube top plate 7 and connected to the simulated wellbore inner tube 2; the data processing mechanism is connected to the driving and power transmission mechanism by electrical signals; The liquid storage mechanism is arranged on one side of the base 23, and the liquid storage mechanism is connected to the outer tube top plate 7 through a liquid inlet pipe 24 and a liquid outlet pipe 25; the liquid inlet pipe 24 passes through the outer tube top surface cover plate 7 and communicates with the inside of the simulated wellbore inner tube 2, and the liquid outlet pipe 25 passes through the outer tube top surface cover plate 7 and communicates with the annulus of the simulated wellbore outer tube 1 and the simulated wellbore inner tube 2; The pressurizing mechanism is arranged on the outer tube bottom plate 6, and an exhaust valve 10 is arranged on the outer tube bottom cover plate 6, and the exhaust valve 10 is communicated with the inside of the simulated wellbore outer tube 1.

[0025] like Figure 1 As shown, in the present invention, an inner tube connection mechanism is fixedly connected to the top side wall of the simulated wellbore outer tube 1, the front end of the simulated wellbore outer tube 1 is sealedly connected to the outer tube top plate 7, the outer tube top plate 7 is connected to the driving and power transmission mechanism, and the rear end of the simulated wellbore outer tube 1 is sealedly connected to the outer tube bottom plate 6; the support mechanism is vertically connected to the base 23, the top of the support mechanism is connected to the simulated wellbore outer tube 1, and the support mechanism is used to support and adjust the inclination of the simulated wellbore outer tube 1. The simulated wellbore inner tube 2 is horizontally connected to the simulated wellbore outer tube 1 through the inner tube connection mechanism, and the body of the simulated wellbore inner tube 2 is connected to the inner tube coupling 3, and the rear end is connected to the nozzle 13.

[0026] In the present invention, a motor control panel 32 is distributed on the motor 20, the lower part of the connecting shaft 19 is connected to the motor 20, the upper part of the connecting shaft 19 is connected to the movable filtration platform 17, and the filter cake 18 of the filtration is distributed on the upper part of the movable filtration platform 17. In actual use, the opening of the motor 20 is controlled by the motor control panel 32 to pressurize to adjust the vertical height of the movable filtration platform 17, and the pressure range is 2-10 MPa to maximize the simulation of the real pressure changes of different well depths.

[0027] In the present invention, the simulated wellbore inner tube 2 includes multiple sections of cylinders and multiple inner tube couplings 3; adjacent cylinders are connected by inner tube couplings 3; the outer diameter of the inner tube couplings 3 is 100-300% of the outer diameter of the simulated wellbore inner tube 2; each section of the cylinder is a hollow cylinder with an outer diameter of 90 mm-150 mm; the total length of the simulated wellbore inner tube 2 is 0.5-50 m.

[0028] In actual use, the present invention can be used to measure the release force and release time of the release fluid. When the device of the present invention is used to measure the release force and release time, the following steps are performed: Check whether the gas source and pressure gauge are working safely and reliably; place the movable filtration platform 17 at the bottom of the simulated wellbore outer tube 1 through the motor 20, install the outer tube bottom cover 6 and the outer tube top cover 7, and connect the pressurizing mechanism to the external gas source; adjust the wellbore inclination adjustment rod 22 to adjust the simulated wellbore outer tube 1 to the inclination angle required for experimental detection; inject drilling fluid into the liquid storage tank 30, first at 4-10 L / s displacement of the infusion pump 28, so that the simulated wellbore outer tube 1 and the simulated wellbore inner tube 2 are filled with drilling fluid, and the circulation cycle of the drilling fluid is established; the stirring motor 9 is turned on to drive the simulated wellbore inner tube 2 to rotate, so that the speed of the simulated wellbore inner tube 2 reaches the speed required by the experiment; the gas source pressure divider 11 and the air inlet valve 12 are opened, so that the pressure of the annulus of the simulated wellbore outer tube 1 and the simulated wellbore inner tube 2 reaches the preset value of the experiment, and the displacement of the infusion pump 28 is further adjusted to the displacement required by the experiment; the valve on the filtrate diversion pipe 15 is opened, and under the action of the pressure difference 30 min later, the filtrate flows into the filtrate collecting box 16 through the filtrate outlet 14; the stirring motor 9 is stopped to stop the rotation of the simulated wellbore inner tube 2; the motor 20 is turned on to apply a certain pressure to raise the movable filtration platform 17 and the filter cake 18 formed on the upper part thereof to the bottom of the simulated wellbore inner tube 2 and compact it for a certain time to simulate the drilling site stuck process; the torque change at the bottom of the simulated wellbore inner tube 2 is transmitted to the computer 27 in real time through the torque sensor 26 for data processing, and the motor 20 is turned off after the torque reaches the maximum value and remains stable; the unstuck liquid to be tested is injected into the liquid storage tank 30, and first 4-10 L / s displacement of the infusion pump 28, so that the simulated wellbore outer tube 1 and the simulated wellbore inner tube 2 are filled with the unblocking liquid to be tested, and a circulation cycle of the unblocking liquid is established; the stirring motor 9 is turned on to drive the simulated wellbore inner tube 2 to rotate, so that the speed of the simulated wellbore inner tube 2 reaches the speed required by the experiment; the gas source pressure divider 11 and the air inlet valve 12 are opened, so that the pressure of the annulus of the simulated wellbore outer tube 1 and the simulated wellbore inner tube 2 reaches the preset value of the experiment, and the displacement of the infusion pump 28 is further adjusted to the displacement required by the experiment; the valve on the filtrate diversion tube 15 is closed, The torque change at the bottom of the simulated wellbore inner tube 2 is transmitted to the computer 27 in real time through the torque sensor 26 for data processing, and the time when the torque at the bottom of the simulated wellbore inner tube 2 reaches the minimum value and remains stable is recorded, that is, the jamming release time; after the simulated wellbore inner tube 2 is completely unjammed, the exhaust valve 10 is opened to release the pressure in the wellbore; the unjamming fluid to be tested is discharged; the torque sensor 26 is closed; the motor 20 is turned on to lower the movable filtration platform 17 to the bottom of the simulated wellbore outer tube 1, and the outer tube bottom cover plate 6 and the outer tube top cover plate 7 are opened to clean the jamming release device.

[0029] The present invention can conduct an evaluation test on the unstuck force and unstuck time of a drilling tool by an unstuck fluid, overcomes the shortcomings of existing unstuck fluid analyzers such as complex operation, low safety, large experimental errors and low degree of fit with the drilling site, and makes up for the shortcomings of on-site production.

[0030] The invention has high simulation degree, simple operation, stable performance, high accuracy and simple structure, and is conducive to popularization and application.

[0031] Embodiment 2: Based on Example 1. In the present invention, preferably, the filtrate collecting mechanism includes a filtrate outlet 14, a filtrate guide tube 15 and a filtrate collecting box 16, the filtrate collecting box 16 is arranged on the outer wall of the lower end of the simulated wellbore outer tube 1, the filtrate outlet 14 corresponds to the filtrate collecting box 16 one by one, the filtrate guide tube 15 is arranged at the filtrate outlet 14, and the lower end of the filtrate guide tube 15 is located in the filtrate collecting box 16. Preferably, the supporting mechanism includes a bracket 21 and a wellbore inclination adjusting rod 22, and the supporting rod 21 and the wellbore inclination adjusting rod 22 are respectively vertically fixed on both sides of the base 23; the two ends of the simulated wellbore outer tube 1 are horizontally fixed on the base 23 through the supporting rod 21 and the wellbore inclination adjusting rod 22.

[0032] In the present invention, the bracket 21 and the wellbore inclination adjustment rod 22 fix the simulated wellbore outer tube 1. The bracket 21 is located at the bottom of the front end of the simulated wellbore outer tube 1, and has a fixed length but is not retractable. The wellbore inclination adjustment rod 22 is located at the bottom of the rear end of the simulated wellbore outer tube 1, and has the ability to retract. By changing the length of the wellbore inclination adjustment rod 22, the simulated wellbore outer tube 1 can be adjusted to different well inclinations. The range of well inclination variation is less than 75°, and the well inclination adopts the angle between the central axis of the simulated wellbore outer tube 1 and the plumb line.

[0033] During specific use, in order to enable the simulated wellbore outer tube 1 to be placed stably, wellbore seats are horizontally arranged at the top of the support rod 21 and the wellbore inclination adjustment rod 22. The top of the wellbore seat is an arc that matches the simulated wellbore outer tube 1, and a clamp for fixing the simulated wellbore outer tube 1 is connected to the wellbore seat arranged on the top of the wellbore inclination adjustment rod 22, so that the simulated wellbore outer tube 1 is more stable when it is set tilted.

[0034] Preferably, the inner tube connection mechanism includes an inner tube bracket 4 and an inner tube bracket lifting ring 5; the inner tube bracket 4 is vertically fixedly connected to the upper inner wall of the simulated wellbore outer tube 1, the bottom end of the inner tube bracket 4 is connected to the inner tube bracket lifting ring 5, and the simulated wellbore inner tube 2 is fixed to the inside of the simulated wellbore outer tube 1 through the inner tube bracket lifting ring 5.

[0035] Preferably, the driving and power transmission mechanism includes a stirring motor 9 and a coupling 8, the outer end of the coupling 8 is connected to the stirring motor 9 disposed outside the simulated wellbore outer tube 1, and the inner end of the coupling 8 is connected to one end of the simulated wellbore inner tube 2.

[0036] In the present invention, in order to ensure the normal operation of the simulated wellbore inner tube 2 driven by the stirring motor 9, a rotary seal is connected to each end of the coupling 8, one rotary seal is used to connect with the simulated wellbore inner tube 2, and the other rotary seal is connected to the liquid inlet pipe 24, so that the drilling fluid can enter the simulated wellbore inner tube 2 when the inner wellbore rotates.

[0037] Preferably, the liquid storage mechanism includes an infusion pump 28, an infusion pump control panel 29, a liquid storage tank 30 and a tank body 31, the infusion pump 28 is arranged in the liquid storage tank 30, and the infusion pump control panel 29 is arranged on the outer wall of the tank body 31; the opening of the infusion pump 28 is controlled by the infusion pump control panel 29; the infusion pump 28 is connected to the liquid inlet tube 24.

[0038] During the actual test and use of the liquid storage mechanism, the opening of the infusion pump 28 is controlled by the infusion pump control panel 29. Under the power of the infusion pump 28, the liquid to be tested in the liquid storage tank 30 enters the simulated wellbore inner tube 2 through the inner port of the liquid inlet pipe 24, and enters the annulus between the simulated wellbore inner tube 2 and the simulated wellbore outer tube 1 through the nozzle 13 connected to the rear end of the simulated wellbore inner tube 2. The liquid to be tested in the annulus can also return to the tank body 31 through the liquid outlet pipe 25.

[0039] The infusion pump 28 in this embodiment is an adjustable displacement pump with a displacement range of 0-15 L / s.

[0040] The infusion pump control panel 29 in this embodiment adopts the existing technology, which is used to control the opening, closing and displacement of the infusion pump 28.

[0041] Preferably, the pressurizing mechanism includes an air source pressure divider 11 and an air intake valve 12; one end of the air intake valve 12 passes through the outer tube bottom cover 6 and is connected to the interior of the simulated wellbore outer tube 1, and the other end of the air intake valve 12 is connected to the air source pressure divider 11.

[0042] When the pressurizing mechanism is actually used, the external gas source is pressure-adjusted by the gas source pressure divider 11 and then input into the annulus between the simulated wellbore outer tube 1 and the simulated wellbore inner tube 2 through the air inlet valve 12, thereby ensuring the supply and stability of the pressure in the annulus and ensuring that the test can be closer to the actual downhole pressure, thus providing accurate data support for the subsequent release performance evaluation test of the release fluid.

[0043] Preferably, the data processing mechanism at least includes a computer 27, and the computer 27 is connected to the stirring motor 9 in the driving and power transmission mechanism through a torque sensor 26, and can detect the torque change at the bottom of the inner tube 2 of the simulated wellbore in real time.

[0044] Preferably, the simulated wellbore outer tube 1 is a hollow cylinder made of transparent material with open ends; the movable filtration platform 17 is a semi-cylindrical structure, and a plurality of filtration channels are distributed on the movable filtration platform 17 at equal intervals.

[0045] In the present invention, the outer tube 1 of the simulated wellbore is a hollow cylinder made of transparent material with open ends; its inner diameter is 117 mm-311 mm, and its length is 0.5 m-50 m. The movable filtration platform 17 is a semi-cylindrical structure, on which a plurality of filtration channels are distributed at equal intervals. The pressure resistance range of the simulated wellbore outer tube 1 and the simulated wellbore inner tube 2 are both 0-10 MPa, and the temperature range is room temperature-200 ℃.

[0046] The outer tube 1 of the simulated wellbore is made of transparent material, so that it can be used to observe the filtration loss of drilling fluid under the conditions of fluid flow, nozzle injection, stirring of the inner tube and the inner tube coupling, the process and form of filter cake formation and destruction, and test the dynamic filtration loss and filter cake scour resistance. The inner diameter of the outer tube 1 of the simulated wellbore adopts a technical solution of 117mm-311mm and a length of 0.5-50m, which ensures that the present invention can meet the actual ratio of wellbores and drill pipes of different sizes in the actual drilling process, so as to truly simulate the actual drilling process.

[0047] Embodiment 3: Based on the first or second embodiment, a test method for a full-wellbore jammer test device is provided in this embodiment, comprising the following steps: Step 1: Check whether the gas source and pressure gauge are working safely and reliably; Step 2: Place the movable filtration platform 17 at the bottom of the outer tube 1 of the simulated wellbore through the motor 20, install the outer tube bottom cover 6 and the outer tube top cover 7, and connect the pressurizing mechanism to the external gas source; Step 3: Adjust the wellbore inclination adjustment rod 22 to adjust the simulated wellbore outer tube 1 to the inclination angle required for experimental detection; Step 4: Inject drilling fluid into the fluid storage tank 30. First, operate the fluid pump 28 at a displacement of 4-10 L / s to fill the simulated wellbore outer tube 1 and the simulated wellbore inner tube 2 with drilling fluid, and establish a circulation cycle of the drilling fluid. Step 5: Turn on the stirring motor 9 to drive the simulated wellbore inner tube 2 to rotate, so that the speed of the simulated wellbore inner tube 2 reaches the speed required by the experiment; Step 6: Open the gas source pressure divider 11 and the air inlet valve 12, so that the pressure of the annulus of the simulated wellbore outer tube 1 and the simulated wellbore inner tube 2 reaches the preset value of the experiment, and further adjust the displacement of the infusion pump 28 to the displacement required by the experiment; Step 7: Open the valve on the filtrate guide pipe 15, and after the pressure difference acts for 30 minutes, the filtrate flows through the filtrate outlet 14 to the filtrate collection box 16; Step 8: The stirring motor 9 stops operating to stop the rotation of the simulated wellbore inner tube 2; the motor 20 is turned on to apply pressure to raise the movable filtration platform 17 and the filter cake 18 formed on the upper part thereof to the bottom of the simulated wellbore inner tube 2 for compaction to simulate the drill bit sticking process at the drilling site; Step 9: The torque change at the bottom of the simulated wellbore inner tube 2 is transmitted to the computer 27 in real time through the torque sensor 26 for data processing, and the motor 20 is turned off after the torque reaches the maximum value and remains stable; Step 10: inject the unstuck liquid to be tested into the liquid storage tank 30, first operate the liquid infusion pump 28 at a displacement of 4-10 L / s, so that the simulated wellbore outer tube 1 and the simulated wellbore inner tube 2 are filled with the unstuck liquid to be tested, and establish a circulation cycle of the unstuck liquid; Step 11: Repeat step 6, open the pressurizing mechanism, and further adjust the displacement of the infusion pump 28 to the displacement required for the experiment; Step 12: Close the valve on the filtrate diversion pipe 15, and transmit the torque change at the bottom of the simulated wellbore inner tube 2 to the computer 27 in real time through the torque sensor 26 for data processing, and record the time when the torque at the bottom of the simulated wellbore inner tube 2 reaches the minimum value and remains stable, that is, the jamming release time; Step 13: After the simulated wellbore inner tube 2 is completely unstuck, open the exhaust valve 10 to release the pressure in the wellbore; discharge the unstuck fluid to be tested; close the torque sensor 26; start the motor 20 to lower the movable filtration platform 17 to the bottom of the simulated wellbore outer tube 1, and open the outer tube bottom cover 7 and the outer tube top cover 7 to clean the unstuck instrument.

[0048] The present invention can truly simulate downhole operation conditions, monitor the adhesion coefficient and torque changes between the drill tool and the filter cake on the wellbore wall, so as to adjust the drilling fluid performance in time and prevent the occurrence of drill sticking accidents. At the same time, the present invention can detect the unstuck force and unstuck time on the basis of detecting the adhesion coefficient of the filter cake, thus achieving the purpose of one machine with multiple uses. The present invention has high simulation degree, simple structure, high test accuracy, simple operation, safety and reliability, and has good promotion and application prospects in scientific research and drilling site operations.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0051] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. Any design that is the same or similar to the present invention belongs to the protection scope of the present invention. The device structures and method steps not described in detail in the present invention are all prior art and will not be further described in the present invention.

Claims

1. A full-wellbore jam-free device experimental device, Features: The device comprises a base (23), a simulated wellbore outer tube (1), a simulated wellbore inner tube (2), a motor (20), a support mechanism, a filtrate collecting mechanism, a driving and power transmission mechanism, a liquid storage mechanism, a data processing mechanism and a pressurizing mechanism. The simulated wellbore outer tube (1) is arranged on the base (23) via the support mechanism. A plurality of filtrate collecting mechanisms are arranged at the lower end of the simulated wellbore outer tube (1). The two ends of the simulated wellbore outer tube (1) are respectively sealed and connected via an outer tube bottom plate (6) and an outer tube top plate (7). The simulated wellbore inner tube (2) is connected to the simulated wellbore outer tube (1) via an inner tube connecting mechanism. A movable filtration loss platform (17) is arranged at the bottom of the simulated wellbore outer tube (1). A filter cake (18) is arranged on the movable filtration loss platform (17). The motor (20) is arranged on a base (23), and the upper end of the motor (20) is connected to the movable filtration platform (17) via a connecting shaft (19); The driving and power transmission mechanism is arranged on the outer cylinder top plate (7) and is connected to the simulated wellbore inner cylinder (2); the data processing mechanism is connected to the driving and power transmission mechanism by electrical signals; The liquid storage mechanism is arranged on one side of the base (23), and is connected to the outer tube top plate (7) via a liquid inlet pipe (24) and a liquid outlet pipe (25); the liquid inlet pipe (24) passes through the outer tube top cover plate (7) and is communicated with the interior of the simulated wellbore inner tube (2); the liquid outlet pipe (25) passes through the outer tube top cover plate (7) and is communicated with the annulus of the simulated wellbore outer tube (1) and the simulated wellbore inner tube (2); The pressurizing mechanism is arranged on the outer tube bottom plate (6), and an exhaust valve (10) is arranged on the outer tube bottom cover plate (6), and the exhaust valve (10) is connected to the interior of the simulated wellbore outer tube (1).

2. A full wellbore jammer experimental device according to claim 1, Features: The filtrate collecting mechanism comprises a filtrate outlet (14), a filtrate guide tube (15) and a filtrate collecting box (16); the filtrate collecting box (16) is arranged on the outer wall of the lower end of the outer tube (1) of the simulated wellbore; the filtrate outlet (14) corresponds to the filtrate collecting box (16) in a one-to-one manner; a filtrate guide tube (15) is arranged at the filtrate outlet (14); and the lower end of the filtrate guide tube (15) is located in the filtrate collecting box (16).

3. A full wellbore jammer experimental device according to claim 1, Features: The support mechanism comprises a support (21) and a wellbore inclination adjustment rod (22), wherein the support rod (21) and the wellbore inclination adjustment rod (22) are respectively fixed vertically on two sides of a base (23); and the two ends of the simulated wellbore outer tube (1) are fixed horizontally on the base (23) via the support rod (21) and the wellbore inclination adjustment rod (22).

4. A full wellbore jammer experimental device according to claim 1, Features: The inner cylinder connection mechanism comprises an inner cylinder support (4) and an inner cylinder support lifting ring (5); the inner cylinder support (4) is vertically fixedly connected to the upper inner side wall of the simulated wellbore outer cylinder (1); the bottom end of the inner cylinder support (4) is connected to the inner cylinder support lifting ring (5); the simulated wellbore inner cylinder (2) is fixed inside the simulated wellbore outer cylinder (1) via the inner cylinder support lifting ring (5).

5. A full wellbore jammer experimental device according to claim 1, Features: The driving and power transmission mechanism comprises a stirring motor (9) and a coupling (8), wherein the outer end of the coupling (8) is connected to the stirring motor (9) disposed outside the simulated wellbore outer tube (1), and the inner end of the coupling (8) is connected to one end of the simulated wellbore inner tube (2).

6. A full wellbore jammer experimental device according to claim 1, Features: The liquid storage mechanism comprises an infusion pump (28), an infusion pump control panel (29), a liquid storage tank (30) and a tank body (31); the infusion pump (28) is arranged in the liquid storage tank (30); the infusion pump control panel (29) is arranged on the outer wall of the tank body (31); the opening of the infusion pump (28) is controlled by the infusion pump control panel 29; and the infusion pump (28) is connected to the liquid inlet pipe (24).

7. The full wellbore jammer experimental device according to claim 1, Features: The pressurizing mechanism comprises an air source pressure divider (11) and an air intake valve (12); one end of the air intake valve (12) penetrates the outer tube bottom cover plate (6) and communicates with the interior of the simulated wellbore outer tube (1), and the other end of the air intake valve (12) is connected to the air source pressure divider (11).

8. The full wellbore jammer experimental device according to claim 1, Features: The data processing mechanism at least includes a computer (27), and the computer (27) is connected to the stirring motor (9) in the driving and power transmission mechanism through a torque sensor (26), so as to detect the torque change at the bottom of the simulated wellbore inner tube (2) in real time.

9. The full wellbore jammer experimental device according to claim 1, Features: The simulated wellbore outer tube (1) is a hollow cylinder made of transparent material with open ends; the movable filtration platform (17) is a semi-cylindrical structure, and a plurality of filtration channels are distributed on the movable filtration platform (17) at equal intervals.

10. A test method for a full wellbore jammer test device according to any one of claims 1 to 9, Features: The following steps are included: Step 1: Check whether the gas source and pressure gauge are working safely and reliably; Step 2: placing the movable filtration platform (17) at the bottom of the simulated wellbore outer tube (1) via a motor (20), installing the outer tube bottom cover plate (6) and the outer tube top cover plate (7), and connecting the pressurizing mechanism to an external gas source; Step 3: adjusting the wellbore inclination adjustment rod (22) to adjust the simulated wellbore outer tube (1) to the inclination angle required for experimental testing; Step 4: Inject drilling fluid into the fluid storage tank (30), first operate the fluid infusion pump (28) at a displacement of 4-10 L / s, fill the simulated wellbore outer tube (1) and the simulated wellbore inner tube (2) with drilling fluid, and establish a circulation cycle of the drilling fluid; Step 5: Turn on the stirring motor (9) to drive the simulated wellbore inner cylinder (2) to rotate, so that the rotation speed of the simulated wellbore inner cylinder (2) reaches the rotation speed required for the experiment; Step 6: Open the gas source pressure divider (11) and the air inlet valve (12) so that the pressure in the annulus of the simulated wellbore outer tube (1) and the simulated wellbore inner tube (2) reaches the preset value of the experiment, and further adjust the displacement of the infusion pump (28) to the displacement required by the experiment; Step 7: Open the valve on the filtrate guide pipe (15), and after the pressure difference acts for 30 minutes, allow the filtrate to flow through the filtrate outlet (14) to the filtrate collection box (16); Step 8: the stirring motor (9) stops operating to stop the simulated wellbore inner tube (2) from rotating; the motor (20) is turned on to apply pressure to raise the movable filter loss platform (17) and the filter cake (18) formed on the upper part thereof to the bottom of the simulated wellbore inner tube (2) for compaction to simulate the drill bit sticking process at the drilling site; Step 9: The torque change at the bottom of the simulated wellbore inner tube (2) is transmitted to the computer (27) in real time through the torque sensor (26) for data processing, and the motor 20 is turned off after the torque reaches the maximum value and remains stable; Step 10: inject the jam-releasing liquid to be tested into the liquid storage tank (30), first operate the liquid infusion pump (28) at a displacement of 4-10 L / s, so that the simulated wellbore outer tube (1) and the simulated wellbore inner tube (2) are filled with the jam-releasing liquid to be tested, and establish a circulation cycle of the jam-releasing liquid; Step 11: Repeat step 6, open the pressurizing mechanism, and further adjust the displacement of the infusion pump (28) to the displacement required for the experiment; Step 12: Close the valve on the filtrate diversion pipe (15), and transmit the torque change at the bottom of the simulated wellbore inner tube (2) to the computer (27) in real time through the torque sensor (26) for data processing, and record the time when the torque at the bottom of the simulated wellbore inner tube (2) reaches the minimum value and remains stable, that is, the jamming release time; Step 13: After the simulated wellbore inner tube (2) is completely unstuck, the exhaust valve (10) is opened to release the pressure in the wellbore; the unstuck fluid to be tested is discharged; the torque sensor (26) is closed; the motor (20) is turned on to lower the movable filtration platform (17) to the bottom of the simulated wellbore outer tube (1), and the outer tube bottom cover (7) and the outer tube top cover (7) are opened to clean the unstuck instrument.

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