Hydraulic self-locking while-drilling reamer drilling method, device, apparatus, medium

Abstract

The application provides a hydraulic self-locking while-drilling reamer drilling method, device, equipment and medium, and the method comprises the following steps: combining a drilling tool, combining a hydraulic self-locking while-drilling reamer, a drill bit and a drill collar assembly into a drilling tool combination, wherein the hydraulic self-locking while-drilling reamer comprises telescopic blades, and the telescopic blades are controlled by using hydraulic pressure; the drill bit provides a drilling hydraulic pressure drop for the hydraulic self-locking while-drilling reamer, and the drill collar assembly provides a drilling pressure for the hydraulic self-locking while-drilling reamer and the drill bit; and drilling is performed by using the drilling tool combination. The application can comprehensively utilize the hydraulic pressure difference to control the while-drilling reamer, and has the advantages of simple operation, strong adaptability, avoidance of a pipe sticking accident caused by the self-locking while-drilling reamer, effective improvement of the reaming efficiency and reaming quality of the self-locking while-drilling reamer, and substantial expansion of the application range of the reaming technology.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling, and more specifically, to a hydraulic self-locking reamer drilling method, a hydraulic self-locking reamer drilling apparatus, and equipment and computer-readable storage medium for implementing the hydraulic self-locking reamer drilling method. Background Technology

[0002] As oil and gas drilling shifts towards deep wells, ultra-deep wells, and high-pressure oil and gas wells, the problems encountered in drilling are also increasing. A common issue is the reduction in wellbore diameter, which makes it difficult to continue drilling. Therefore, the technology of reaming while drilling (WDD) has emerged. This technology and tool not only solves the problem of reduced wellbore diameter but also enlarges the wellbore diameter, facilitating downhole testing and casing operations. It also reduces the number of casing layers, thereby reducing the amount of casing steel and cement used, and lowering operating costs. However, currently, WDD tools are mainly controlled by ball dropping for activation, and the blades generally require pump shutdown and spring retraction, resulting in mostly single-stroke reaming and low efficiency. For example, a paper published on May 10, 2019, entitled "Development and Typical Application of Hydraulic WDD Reamer," describes a hydraulic WDD reamer and its application. This hydraulic WDD reamer controls the extension and retraction of the blades by ball dropping. The balls are divided into small-diameter initiation balls and large-diameter release balls. When the reamer is in operation, the starting ball is first engaged. The ball falls into the starting mechanism, creating pressure that shears off the lower shear pin, opening the main fluid channel and the bypass fluid channel. The main fluid continues to flow downwards towards the drill bit, while the bypass fluid drives the cutter wings to extend and clean and cool them. However, this still cannot fully utilize hydraulic differential pressure to control the reamer while drilling. Therefore, how to efficiently and comprehensively control unlimited hydraulic differential pressure will be the development direction for the control of reamer tools while drilling, and will significantly broaden the application scope of reaming technology. Summary of the Invention

[0003] The purpose of this invention is to address at least one of the aforementioned shortcomings of the prior art. For example, one objective of this invention is to provide a drilling method using a hydraulic self-locking reamer while drilling. By combining this method with a hydraulic self-locking reamer while drilling, it can solve the technical problems of small casing annulus clearance in wells with small gaps, ultra-deep wells, and wells with salt-gypsum formations, as well as the poor resistance to formation creep and sealing capacity of the cement sheath cementing system. Furthermore, it increases the wellbore diameter, which is beneficial for downhole testing and casing installation. It also reduces the number of casing layers, thereby reducing the amount of casing steel and cement used, lowering operating costs, and providing theoretical support for the field operation of self-locking oil drilling reamer while drilling devices.

[0004] To achieve the above objectives, the present invention provides a drilling method using a hydraulically self-locking reamer while drilling (HWSD). The HWSD method may include the following steps: assembling a drill string by combining the HWSD, drill bit, and drill collar assembly into a drill string assembly, wherein the HWSD includes telescopic cutter wings, which are hydraulically controlled; the drill bit provides drilling pressure drop for the HWSD, and the drill collar assembly provides drilling pressure for the HWSD and drill bit; and drilling using the drill string assembly.

[0005] In an exemplary embodiment of the drilling method of the hydraulic self-locking reamer of the present invention, the first starting displacement and first pump pressure, the second working displacement and second pump pressure, and the third locking displacement and third pump pressure of the hydraulic self-locking reamer can be tested before drilling begins.

[0006] In an exemplary embodiment of the drilling method of the hydraulic self-locking reamer of the present invention, before starting drilling, the fourth downhole working displacement can be confirmed based on the second pump pressure; the fifth downhole locked displacement and the fourth pump pressure can be confirmed based on the third pump pressure; whether the telescopic cutter blade is locked can be confirmed based on the fourth pump pressure and the first pump pressure; when the telescopic cutter blade is not locked, the drilling fluid displacement can be increased until the telescopic cutter blade is locked, and the fifth downhole locked displacement and the fourth pump pressure are updated; when the telescopic cutter blade is locked, the drilling fluid displacement can be increased to the fifth downhole locked displacement, triggering the telescopic cutter blade to unlock, and after running for a period of time, the pump is stopped, and the telescopic cutter blade is automatically retracted into the body.

[0007] In an exemplary embodiment of the hydraulic self-locking drilling method for a reamer under drilling, the drilling fluid flow rate can be increased to no more than the first starting flow rate for flow rate circulation; the drilling fluid flow rate can be increased to the first starting flow rate, and the fifth pump pressure at the current flow rate is recorded; the drilling fluid flow rate can be increased to the fourth downhole working flow rate and the rotary table or top drive torque returns to zero, with the telescopic cutter blades fully open; the drilling fluid flow rate can be increased to the fifth downhole locking flow rate to lock the telescopic cutter blades; the drilling fluid flow rate can be decreased to the first starting flow rate, and the sixth pump pressure at this time is recorded; whether the telescopic cutter blades are locked can be confirmed based on the sixth pump pressure and the fifth pump pressure; when the telescopic cutter blades are not locked, the drilling fluid flow rate can be increased and then decreased to the first starting flow rate, and the sixth pump pressure can be updated until the telescopic cutter blades are locked; the drilling fluid flow rate can be increased to the fourth downhole working flow rate for reaming drilling.

[0008] In an exemplary embodiment of the drilling method of the hydraulic self-locking reamer of the present invention, the drilling fluid discharge rate can be reduced to the first starting discharge rate, and the pump pressure at this time is recorded as the seventh pump pressure; the drilling fluid discharge rate can be increased to the fifth downhole locked discharge rate, the rotary table or top drive torque can be returned to zero, and the drill string can be rotated; the drilling fluid discharge rate can be reduced to the first starting discharge rate, and the pump pressure at this time can be recorded as the eighth pump pressure; the telescopic cutter blades can be confirmed as unlocked based on the seventh pump pressure and the eighth pump pressure.

[0009] In an exemplary embodiment of the drilling method of the hydraulic self-locking reamer of the present invention, the drill string assembly can be lifted up, and the sliding mandrel inside the hydraulic self-locking reamer can be sheared by the friction between the well wall and the telescopic cutter blade, so that the telescopic cutter blade can enter the interior of the hydraulic self-locking reamer and achieve forced retraction of the telescopic cutter blade.

[0010] In an exemplary embodiment of the drilling method of the hydraulic self-locking drilling reamer of the present invention, when encountering resistance during tripping or tripping, drilling fluid can be circulated. The displacement of the drilling fluid may not be greater than the first starting displacement, and the reaming speed may be 40-50 rpm.

[0011] In an exemplary embodiment of the drilling method of the hydraulic self-locking drilling reamer of the present invention, when the fourth pump pressure is less than the first pump pressure by 0.2-0.4 MPa, the telescopic cutter blade is successfully locked; when the fourth pump pressure is equal to or close to the first pump pressure, the telescopic cutter blade is not successfully locked, and the increase in drilling fluid discharge can be 1-3 L / s each time.

[0012] In an exemplary embodiment of the drilling method of the hydraulic self-locking reamer of the present invention, when the sixth pump pressure is less than the fifth pump pressure by 0.2-0.4 MPa, the telescopic cutter blade is successfully locked; when the sixth pump pressure and the fifth pump pressure are equal or close, the telescopic cutter blade is not successfully locked, and the increase in drilling fluid discharge can be 1-3 L / s each time.

[0013] In an exemplary embodiment of the drilling method of the hydraulic self-locking reamer of the present invention, when the pressure of the seventh pump is less than the pressure of the eighth pump by 0.2-0.4 MPa, the telescopic blade is successfully locked; when the pressure of the seventh pump and the pressure of the eighth pump are equal or close, the telescopic blade is not successfully locked, and the increase in drilling fluid discharge can be 1-3 L / s each time.

[0014] In another aspect, the present invention provides a hydraulically self-locking reamer drilling apparatus, the apparatus comprising: a combined drill string module, a drilling platform testing module, a wellhead testing module, a downhole module, a reamerizing module, a retractable cutter wing recovery module, and a tripping module; wherein, the combined drill string module is used to construct and control the drill string assembly; the drilling platform testing module is connected to the combined drill string module and is used to test the first starting displacement, second working displacement, third locking displacement, and third pump pressure of the hydraulically self-locking reamer; the wellhead testing module is connected to the drilling platform testing module and is used to test the fourth downhole working displacement, fifth locking displacement, and fourth pump pressure, and can also test the third pump pressure based on the third pump pressure. The pressure and the fourth pump pressure determine whether the telescopic cutter blade is locked; the downhole module can be connected to the combined drill string module and can be used to control the drilling fluid discharge rate and reaming speed during the downhole process; the drilling reaming module can be connected to the drill platform test module and the wellhead test module and can be used to open and lock the telescopic cutter blade according to the first start discharge rate and the fifth downhole locking discharge rate, detect the locking status of the telescopic cutter blade, and control the reaming drilling; the telescopic cutter blade recovery module can be connected to the drill platform test module and the wellhead test module and can be used to unlock the telescopic cutter blade and test whether the cutter blade is recovered; the tripping module can be connected to the combined drill string module and can be used to control the drilling fluid discharge rate and reaming speed during the tripping process.

[0015] In another aspect, the present invention provides an apparatus comprising:

[0016] Processor; memory storing a computer program that, when executed by the processor, implements the hydraulic self-locking drilling method for reamers as described above.

[0017] In another aspect, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the hydraulically self-locking reamer drilling method as described above.

[0018] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0019] (1) This application provides a hydraulic self-locking reamer method, which can fully utilize hydraulic differential pressure to control the reamer, and is simple to operate, highly adaptable, and can effectively improve the reaming efficiency and reaming quality of the self-locking reamer, greatly expanding the application scope of reaming technology.

[0020] (2) This application provides a hydraulic self-locking reamer method. When the method is tested on the drilling platform, it can accurately test the starting displacement, starting pump pressure, working pump pressure and telescopic blade locking / unlocking pump pressure of the self-locking reamer when the current drilling fluid density is tested. It can effectively avoid the situation where the self-locking reamer fails to operate downhole due to misoperation.

[0021] (3) This application provides a hydraulic self-locking reamer method. When the wellhead is tested, the working displacement of the self-locking reamer and the locking / unlocking pump pressure of the telescopic blade can be accurately tested when the current drilling fluid density is tested. At the same time, the pump pressure difference between the locked and unlocked states of the telescopic blade can be accurately measured when the displacement is started. This can be used to accurately determine whether the self-locking reamer is locked downhole, thus ensuring the quality of reaming.

[0022] (4) This application provides a hydraulic self-locking reamer method. In the process of reaming while drilling, the method can activate the tool according to the starting displacement of the self-locking reamer measured by the wellhead test, and then lock the telescopic blade. The method can determine whether the telescopic blade is successfully locked based on the pump pressure difference value when the telescopic blade is in the locked and unlocked states when the starting displacement is activated. After confirming that the telescopic blade is successfully locked, reaming can be carried out to ensure that the reaming while drilling is carried out smoothly.

[0023] (5) This application provides a hydraulic self-locking drilling reamer method, which can accurately determine whether the telescopic cutter blade has been retracted to the correct position by changing the pump pressure, thus avoiding a stuck drill accident caused by the cutter blade not being retracted.

[0024] (6) This application provides a hydraulic self-locking reamer method, which can forcibly retract the telescopic blades. If the energy storage device fails and the telescopic blades cannot be retracted autonomously, the drill string can be lifted up, and the frictional resistance generated between the well wall and the telescopic blades can be used to force the shears to move the core tube, so that the telescopic blades lose their support and are automatically retracted into the body. This can effectively avoid stuck drill accidents caused by the self-locking reamer. Attached Figure Description

[0025] The above and other objects and / or features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0026] Figure 1 A schematic diagram of a self-locking reamer assembly is shown as an exemplary embodiment of the hydraulic self-locking reamer drilling method of the present invention.

[0027] Figure 2 A schematic diagram of an overall self-locking reamer drilling method of the present invention is shown, illustrating an exemplary embodiment of the self-locking reamer drilling method of the present invention.

[0028] Figure 3 A schematic diagram of a forced recovery method for telescopic cutter wings is shown as an exemplary embodiment of the hydraulic self-locking drilling reamer method of the present invention.

[0029] Figure 4A schematic diagram of the forced recovery process of the telescopic cutter blade is shown as an exemplary embodiment of the hydraulic self-locking drilling reamer method of the present invention.

[0030] Figure 5 A schematic diagram of an exemplary embodiment of the hydraulic self-locking drilling reamer of the present invention is shown.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1-Upper connector; 2-Self-locking reamer while drilling; 3-Lower connector; 101-Nozzle; 102-Telescopic cutter wing; 103-Wellbore; 104-Sliding mandrel; 100-Combined drill string module; 110-Drilling platform testing module; 120-Wellhead testing module; 130-Run-down module; 140-Retrieve reamer while drilling module; 150-Recover telescopic cutter wing module; 160-Take-out module. Detailed Implementation

[0033] In the following sections, the hydraulic self-locking drilling method, apparatus, equipment, and medium of the present invention will be described in detail with reference to exemplary embodiments.

[0034] It should be noted that the terms "first," "second," and "third" in this invention are merely for ease of description and distinction, and should not be construed as indicating or implying relative importance. The terms "S1," "S2," and "S3" are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0035] Advances in reaming while drilling technology can improve the quality of oil and gas well construction; enable small-clearance casing programs, reducing overall drilling costs; solve downhole creep formation problems; ensure the implementation of new technologies such as multi-branch well technology, extended reach well technology, and expandable tubing technology; and improve the casing size and development efficiency of sidetracking wells. However, while there is considerable research on reaming tools, practical applications are limited.

[0036] To address the aforementioned problems, the inventors have proposed a hydraulically self-locking reamer drilling method. This method enables comprehensive and unrestricted hydraulic control of the reamer, reliably controlling the cutter wings in various complex downhole environments to maintain a stable wellbore enlargement rate and achieve precise reaming, while effectively preventing stuck pipe accidents. This invention also provides guidance for reaming operations using a hydraulically self-locking reamer, detailing processes such as wellhead working status monitoring, tool running-in, reamer opening, reamer locking, reaming drilling, reamer unlocking, retractable cutter wing retrieval, and handling methods after cutter wing retrieval failure.

[0037] To achieve the above objectives, the present invention provides a hydraulic self-locking drilling method using a drilling reamer.

[0038] In an exemplary embodiment of the hydraulic self-locking reamer drilling method of the present invention, the hydraulic self-locking reamer drilling method may include:

[0039] A drill string assembly combines a hydraulically self-locking reamer, a drill bit, and a drill collar assembly. The hydraulically self-locking reamer may include telescopic cutter wings, which can be hydraulically controlled. The drill bit provides drilling pressure reduction for the hydraulically self-locking reamer, and the drill collar assembly provides drilling pressure for both the hydraulically self-locking reamer and the drill bit. Drilling can be performed using this drill string assembly.

[0040] Optionally, before starting drilling, test the first starting displacement and first pump pressure, second working displacement and second pump pressure, and third locking displacement and third pump pressure of the hydraulic self-locking reamer.

[0041] More specifically, when encountering resistance during tripping or descent, the drilling fluid can be circulated, with the drilling fluid discharge rate not exceeding the initial starting discharge rate, and the reaming speed set at 40-50 rpm.

[0042] Optionally, before starting drilling, the fourth downhole working displacement is confirmed based on the second pump pressure; the fifth downhole locked displacement and the fourth pump pressure are confirmed based on the third pump pressure; the locking status of the telescopic cutter wings is confirmed based on the fourth pump pressure and the first pump pressure; when the telescopic cutter wings are not locked, the drilling fluid displacement is increased until the telescopic cutter wings are locked, and the fifth downhole locked displacement and the fourth pump pressure are updated; when the telescopic cutter wings are successfully locked, the drilling fluid displacement is increased to the fifth downhole locked displacement, triggering the unlocking of the telescopic cutter wings, and after running for a period of time, the pump is stopped, and the telescopic cutter wings are automatically retracted into the body.

[0043] More specifically, when the fourth pump pressure is 0.2-0.4 MPa less than the first pump pressure, the telescopic cutter blade is successfully locked; when the fourth pump pressure is equal to or close to the first pump pressure, the telescopic cutter blade is not successfully locked, and the drilling fluid discharge rate is increased by 1-3 L / s each time.

[0044] Optionally, increase the drilling fluid flow rate to no more than the first starting flow rate for flow rate circulation; increase the drilling fluid flow rate to the first starting flow rate and record the fifth pump pressure at the current flow rate; increase the drilling fluid flow rate to the fourth downhole working flow rate and return the rotary table or top drive torque to zero, with the telescopic cutter blades fully open; increase the drilling fluid flow rate to the fifth downhole locking flow rate and lock the telescopic cutter blades; decrease the drilling fluid flow rate to the first starting flow rate and record the sixth pump pressure at this time; confirm whether the telescopic cutter blades are locked based on the sixth and fifth pump pressures; if the telescopic cutter blades are not locked, increase the drilling fluid flow rate and then decrease it to the first starting flow rate, update the sixth pump pressure until the telescopic cutter blades are locked; increase the drilling fluid flow rate to the fourth downhole working flow rate and perform reaming drilling.

[0045] More specifically, when the pressure of the sixth pump is 0.2-0.4 MPa less than the pressure of the fifth pump, the telescopic cutter blade is successfully locked; when the pressure of the sixth pump is equal to or close to the pressure of the fifth pump, the telescopic cutter blade is not successfully locked, and the drilling fluid discharge rate is increased by 1-3 L / s each time.

[0046] Optionally, reduce the drilling fluid flow rate to the first starting flow rate and record the pump pressure at this time as the seventh pump pressure; increase the drilling fluid flow rate to the fifth downhole locked flow rate, return the rotary table or top drive torque to zero, and rotate the drill string; reduce the drilling fluid flow rate to the first starting flow rate and record the pump pressure at this time as the eighth pump pressure; confirm whether the telescopic cutter blade is unlocked based on the seventh and eighth pump pressures.

[0047] More specifically, when the pressure of the seventh pump is 0.2-0.4 MPa less than the pressure of the eighth pump, the telescopic cutter blade is successfully locked; when the pressure of the seventh pump is equal to or close to the pressure of the eighth pump, the telescopic cutter blade is not successfully locked, and the drilling fluid discharge rate is increased by 1-3 L / s each time.

[0048] Optionally, the drill string assembly can be lifted, and the friction between the wellbore and the telescopic cutter blades can be used to shear the sliding mandrel inside the hydraulic self-locking reamer. The telescopic cutter blades can then enter the hydraulic self-locking reamer, thus achieving forced retraction of the telescopic cutter blades.

[0049] According to another aspect of the present invention, a hydraulic self-locking reamer drilling device is also provided, which may include: a combined drill string module, a drill platform testing module, a wellhead testing module, a running-in module, a reamer drilling module, a retractable cutter wing recovery module, and a tripping-out module. The system comprises the following modules: a combined drilling tool module for constructing and controlling the drilling tool assembly; a drilling rig testing module connected to the combined drilling tool module for testing the first starting displacement, second working displacement, third locking displacement, and third pump pressure of the hydraulic self-locking reamer; a wellhead testing module connected to the drilling rig testing module for testing the fourth downhole working displacement, fifth locking displacement, and fourth pump pressure, and for determining whether the telescopic cutter wings are locked based on the third and fourth pump pressures; a running-in module connected to the combined drilling tool module for controlling the drilling fluid displacement and reaming speed during the running-in process; a reaming module connected to the drilling rig testing module and the wellhead testing module for opening and locking the telescopic cutter wings based on the first starting displacement and fifth downhole locking displacement, detecting the locking status of the telescopic cutter wings, and controlling the reaming drilling; a telescopic cutter wing retrieval module connected to the drilling rig testing module and the wellhead testing module for unlocking the telescopic cutter wings and testing whether the cutter wings are retrieved; and a tripping-out module connected to the combined drilling tool module for controlling the drilling fluid displacement and reaming speed during the tripping-out process.

[0050] According to another aspect of the invention, a computer device is also provided. The computer device includes a processor and a memory, the memory storing a computer program that is executed by the processor to cause the processor to perform the computer program for the hydraulically self-locking reamer drilling method according to the invention.

[0051] According to another aspect of the invention, a computer-readable storage medium storing a computer program is also provided. This computer-readable storage medium stores a computer program that, when executed by a processor, causes the processor to execute the hydraulically self-locking reamer drilling method according to the invention. This computer-readable recording medium is any data storage device capable of storing data read from a computer system. Examples of computer-readable recording media include: read-only memory, random access memory, read-only optical disc, magnetic tape, floppy disk, optical data storage device, and carrier waves (such as data transmission via the Internet through wired or wireless transmission paths).

[0052] To better understand the exemplary embodiments of the present invention described above, further explanation is provided below with reference to specific examples and accompanying drawings, but the examples given are not intended to limit the present invention.

[0053] Example 1

[0054] A drilling assembly can be selected, consisting of a hydraulically self-locking reamer, a drill bit, and a drill collar assembly. The hydraulically self-locking reamer, drill bit, and drill collar assembly are combined into a single drilling assembly. The drill bit provides drilling hydraulic pressure to the hydraulically self-locking reamer and facilitates drilling into the lead hole; the drill collar assembly provides drilling pressure to both the hydraulically self-locking reamer and the drill bit. Drilling is then performed using this drilling assembly.

[0055] Example 2

[0056] In this example, the hydraulic self-locking reamer 2 method can be implemented through the following steps, such as... Figure 1 and Figure 2 As shown, the process can be divided into seven steps: drill string assembly, drill platform testing, wellhead testing, running in, reaming while drilling, retraction of the telescopic cutter blades, and tripping out. The purposes of the wellhead testing and the drill platform testing are: ① to test whether the self-locking reamer 2 is functioning correctly. ② to test the reamer's starting displacement, working displacement, and the locking / unlocking displacement of the telescopic cutter blades 102 under different drilling fluid densities. If the self-locking reamer 2 fails to automatically retract the telescopic cutter blades 102 after reaming operations, a forced retraction step of the telescopic cutter blades 102 must be added. The specific process is as follows:

[0057] S1. Drill String Assembly: At least one upper connector 1, one self-locking reamer 2, one lower connector 3, one drill bit, and one drill collar assembly can be selected and combined to form a single drill string assembly. Figure 2As shown. Among them, the upper connector 1 is used to connect the drill collar assembly and the self-locking reamer 2; the lower connector 3 is used to connect the self-locking reamer 2 and the drill bit; the drill bit is used to provide drilling pressure for the self-locking reamer 2 and to drill out the lead hole; the drill collar assembly provides drilling pressure for the self-locking reamer 2 and the drill bit.

[0058] S2. Drilling Platform Test: The purpose of the drilling platform test is to measure the starting displacement and pump pressure, working displacement and pump pressure, and locking / unlocking displacement and pump pressure of the self-locking reamer 2 when the nozzle 101 is not installed. Specifically, this includes:

[0059] S21. Test the starting displacement and pump pressure of the self-locking reamer 2: Place the self-locking reamer 2 at the wellhead, remove the three nozzles 101 on the self-locking reamer 2, install three plugs at the original nozzle 101 positions, start the mud pump, and slowly increase the drilling fluid displacement until the telescopic blade 102 begins to open. Record the starting displacement L1 when the telescopic blade 102 begins to open and the pump pressure P1 at this time.

[0060] S22. Test the working displacement and pump pressure of the self-locking reamer 2: The drilling fluid displacement can be increased from the starting displacement L1 of the self-locking reamer 2 until the telescopic blade 102 is fully opened. Record the working displacement L2 when the telescopic blade 102 is fully opened and the pump pressure P2 at this time.

[0061] S23. Test the locking / unlocking displacement and pump pressure of the telescopic cutter wing 102: Increase the drilling fluid displacement by 2 L / s each time based on the working displacement L2 of the self-locking reamer 2, then stop the pump. Repeat this operation until the telescopic cutter wing 102 no longer retracts into the body of the self-locking reamer 2, and the surface telescopic cutter wing 102 is in a locked state. Record the locked displacement L3 of the telescopic cutter wing 102 and the pump pressure P3 at this time. Increase the drilling fluid displacement to L3 again, stop the pump, and observe whether the telescopic cutter wing 102 retracts into the body. If it retracts successfully, the surface self-locking reamer 2 is working normally, and the next step, under-drilling test, can be performed.

[0062] S3. Wellhead Test: The wellhead test involves placing the self-locking reamer 2 into the casing 20-30m above the drill string to prevent drilling fluid from spraying onto the drill string during the test. The purpose is to test the downhole working displacement of the self-locking reamer 2 after nozzle 101 is installed, the locking / unlocking displacement of the telescopic cutter 102, and to determine whether the telescopic cutter 102 is locked.

[0063] S31. Test the downhole working displacement of the self-locking reamer 2: Remove the three plugs installed at the nozzle 101 on the drilling platform, install the nozzle 101, put the self-locking reamer 2 into the casing 20-30m away from the drilling platform, start the mud pump, slowly increase the drilling fluid displacement, and observe the increase in pump pressure. When the pump pressure increases to P2, record the drilling fluid displacement L4 at this time. The displacement L4 is the downhole working displacement of the self-locking reamer 2.

[0064] S32. Test the downhole locking / unlocking displacement of the telescopic cutter wing 102: The drilling fluid displacement can be slowly increased based on the downhole working displacement L4 of the self-locking drilling reamer 2. Observe the increase in pump pressure. When the pump pressure increases to P3, record the drilling fluid displacement L5 at this time. Displacement L5 is the downhole locking / unlocking displacement of the telescopic cutter wing 102.

[0065] S33. Determine if the telescopic cutter wing 102 is successfully locked: Based on the downhole locking displacement L5 of the telescopic cutter wing 102, slowly reduce the drilling fluid to L1 and record the pump pressure P4 at this time. If P4 is 0.2-0.4 MPa less than P1, it indicates that the telescopic cutter wing 102 is successfully locked. Then, increase the drilling fluid displacement to L5 again to trigger the unlocking of the telescopic cutter wing 102. After running for 1 minute, stop the pump to allow the telescopic cutter wing 102 to automatically retract into the body, and then start connecting the drill pipe and running it down.

[0066] If P4 is equal to or close to P1, it indicates that the telescopic cutter wing 102 has not been successfully locked. The flow rate must be increased by 2L / s each time based on the displacement L5. After each increase, the drilling fluid displacement must be reduced to L1, and the pump pressure P4 must be recorded again. This continues until P4 is 0.2-0.4MPa less than P1, indicating that the telescopic cutter wing 102 has been successfully locked. The drilling fluid displacement can then be increased to the new L5 to trigger the unlocking of the telescopic cutter wing 102. After running for 1 minute, the pump is stopped, allowing the telescopic cutter wing 102 to automatically retract into the main body. Then, the drill pipe can be connected and the drill pipe lowered.

[0067] S4. Drilling: The drilling process should be carried out at a uniform and slow speed to avoid sudden pulling and releasing. If the drilling fluid is blocked during drilling and needs to be circulated, the drilling fluid discharge rate should not exceed L1, and the reaming speed should be 40-50 rpm.

[0068] S5. Reaming while Drilling: Reaming while drilling can include four steps: opening the telescopic cutter 102, locking the telescopic cutter 102, checking the locked status of the telescopic cutter 102, and drilling the reaming hole. The specific process is as follows:

[0069] S51. Open the telescopic cutter wing 102: The self-locking reamer 2 can be run down to the reaming formation. Then, first circulate at a low flow rate to clean the rock cuttings deposited in the wellbore. The flow rate should not exceed L1. After sufficient circulation, slowly increase the drilling fluid flow rate to L1 and increase the rotary table (or top drive) speed to 60-80 rpm. Record the pump pressure P5 at this time. Then slowly increase the drilling fluid flow rate to L4 and wait for the rotary table (or top drive) torque to return to zero. The surface telescopic cutter wing 102 is now fully open.

[0070] S52. Locking the telescopic cutter wing 102: Locking the telescopic cutter wing 102 is to fix it in the fully open state, preventing irregular reaming diameter caused by pump pressure fluctuations. The process is as follows: Based on the drilling fluid displacement L4 mentioned above, slowly increase the drilling fluid displacement to L5, triggering the cam mechanism to lock the telescopic cutter wing 102. During this process, it is necessary to observe whether the torque of the rotary table (or top drive) remains at zero. If it is not zero, wait for the torque of the rotary table (or top drive) to return to zero, and then maintain the zero torque state while rotating the drill string for 5-10 minutes.

[0071] S53. Check the locking status of the telescopic cutter wing 102: Checking the locking status of the telescopic cutter wing 102 is to determine whether it has been locked at the maximum reaming position, laying the foundation for subsequent high-quality reaming drilling. Based on the downhole locking displacement L5 of the telescopic cutter wing 102, slowly reduce the drilling fluid to L1 and record the pump pressure P6 at this time. If P6 is 0.2-0.4 MPa less than P5, it indicates that the telescopic cutter wing 102 is successfully locked; if P6 is equal to or close to P5, it indicates that the telescopic cutter wing 102 is not successfully locked. The displacement L5 must be increased by 2 L / s each time, and after each increase, the drilling fluid displacement must be reduced to L1, and the pump pressure P6 must be recorded again, until P6 is 0.2-0.4 MPa less than P5, indicating that the telescopic cutter wing 102 is successfully locked.

[0072] S54. Enlarged Borehole Drilling: Enlarged borehole drilling involves enlarging the original borehole diameter to meet the requirements of formation creep, borehole diameter reduction, and casing installation. After confirming successful locking of the telescopic cutter 102, the drilling displacement is slowly increased from L1 to L4, and enlarged borehole drilling is carried out in a constant drilling pressure mode of 2-5 tons.

[0073] S6. Recovering the telescopic cutter wing 102: Recovering the telescopic cutter wing 102 involves retrieving it back into the reamer body after the reaming process is completed. This includes two processes: unlocking the telescopic cutter wing 102 and testing whether the wing was successfully recovered. The specific process is as follows:

[0074] S61. Unlock telescopic cutter wing 102: The drilling fluid displacement can be slowly reduced from L4 to L1, and the pump pressure P7 at this time can be recorded. Then the drilling fluid displacement can be slowly increased from L1 to L5, triggering the cam mechanism to unlock the telescopic cutter wing 102. During this process, it is necessary to observe whether the torque of the rotary table (or top drive) remains at zero. If it is not zero, wait for the torque of the rotary table (or top drive) to return to zero, and then keep the torque at zero and rotate the drill string for 5-10 minutes.

[0075] S62. Test whether the telescopic cutter wing is successfully retracted: The drilling fluid discharge rate can be slowly reduced from L5 to L1, and the pump pressure P8 at this time can be recorded. If P7 is 0.2-0.4 MPa less than P8, it indicates that the telescopic cutter wing 102 has been successfully unlocked. If P7 is equal to or close to P8, it indicates that the telescopic cutter wing 102 has not been successfully unlocked. The above unlocking process of the telescopic cutter wing 102 must be repeated until P7 is 0.2-0.4 MPa less than P8.

[0076] S7. Pulling out the drill: The drilling process should be carried out at a uniform and slow speed to avoid sudden pulling and releasing. If the drilling is blocked and the drilling fluid needs to be circulated, the drilling fluid discharge rate should not exceed L1. The reaming speed should be 40-50 rpm.

[0077] Example 3

[0078] As in Example 1, during drilling operations, if the autonomous retraction of the telescopic cutter wing 102 fails, a forced retraction of the telescopic cutter wing 102 is required. The process is as follows: Figure 3 As shown, the forced recovery of the telescopic cutter wing 102 is due to internal mechanical damage to the self-locking reamer 2, which prevents the telescopic cutter wing 102 from being recovered into the reamer body by unlocking the telescopic cutter wing 102 as described above. Therefore, the telescopic cutter wing 102 needs to be forcibly recovered to facilitate subsequent drilling operations.

[0079] Specific methods may include: lifting the drill string assembly (such as...) Figure 4 As shown, the sliding mandrel 104 inside the self-locking drilling reamer 2 is sheared by the friction between the well wall 103 and the telescopic cutter 102, so that the telescopic cutter 102 loses the supporting force of the sliding mandrel 104. Finally, the telescopic cutter 102 will enter the body along the groove on the reamer body, realizing the forced recovery of the telescopic cutter 102.

[0080] Example 4

[0081] This example provides a hydraulically self-locking reamer drilling device (such as...). Figure 5 As shown, the device may include: a combined drilling tool module 100, a drilling platform testing module 110, a wellhead testing module 120, a downhole module 130, a drilling reaming module 140, a retractable cutter wing recovery module 150, and a tripping module 160.

[0082] The combined drill bit module 100 can be used to construct and control the drill bit assembly.

[0083] The drilling rig test module 110 can be connected to the combined drilling tool module 100 to test the first starting displacement, second working displacement, third locking displacement and third pump pressure of the hydraulic self-locking reamer.

[0084] The wellhead test module 120 can be connected to the drilling platform test module 110 to test the fourth downhole working displacement, the fifth locked displacement and the fourth pump pressure, and to determine whether the telescopic cutter blade is locked based on the third pump pressure and the fourth pump pressure.

[0085] The downhole module 130 can be connected to the combined drill string module 100 to control the drilling fluid discharge and reaming speed during the downhole process.

[0086] The drilling reaming module 140 can be connected to the drilling platform test module 110 and the wellhead test module 120. It is used to open the telescopic cutter wings, lock the telescopic cutter wings, detect the locking status of the telescopic cutter wings, and control the reaming drilling according to the first starting displacement and the fifth downhole locking displacement.

[0087] The retractable cutter wing recovery module 150 can be connected to the drilling platform test module 110 and the wellhead test module 120 to unlock the retractable cutter wing and test whether the cutter wing has been recovered.

[0088] The tripping module 160 can be connected to the combined drill string module 100 to control the drilling fluid discharge and reaming speed during the tripping process.

[0089] Example 5

[0090] This exemplary embodiment provides a computer device, including:

[0091] At least one processor;

[0092] A memory storing program instructions configured to be executed by the at least one processor, the program instructions including instructions for performing the method according to any one of Examples 1-3.

[0093] Example 6

[0094] This exemplary embodiment provides a computer-readable storage medium.

[0095] The storage medium stores a computer program. When the computer program instructions are executed by a processor, they implement the method described in any of Examples 1-3.

[0096] The computer-readable storage medium can be any data storage device that stores data that can be read by a computer system. Examples of computer-readable storage media include: read-only memory, random access memory, read-only optical disc, magnetic tape, floppy disk, optical data storage device, and carrier waves (such as data transmission via the Internet through wired or wireless transmission paths).

[0097] In summary, the beneficial effects are as follows:

[0098] (1) This application provides a hydraulic self-locking reamer method, which can fully utilize hydraulic differential pressure to control the reamer, and is simple to operate, highly adaptable, and can effectively improve the reaming efficiency and reaming quality of the self-locking reamer, greatly expanding the application scope of reaming technology.

[0099] (2) This application provides a hydraulic self-locking reamer method. When the method is tested on the drilling platform, it can accurately test the starting displacement, starting pump pressure, working pump pressure and telescopic blade locking / unlocking pump pressure of the self-locking reamer when the current drilling fluid density is tested. It can effectively avoid the situation where the self-locking reamer fails to operate downhole due to misoperation.

[0100] (3) This application provides a hydraulic self-locking reamer method. When the wellhead is tested, the working displacement of the self-locking reamer and the locking / unlocking pump pressure of the telescopic blade can be accurately tested when the current drilling fluid density is tested. At the same time, the pump pressure difference between the locked and unlocked states of the telescopic blade can be accurately measured when the displacement is started. This can be used to accurately determine whether the self-locking reamer is locked downhole, thus ensuring the quality of reaming.

[0101] (4) This application provides a hydraulic self-locking reamer method. In the process of reaming while drilling, the method can activate the tool according to the starting displacement of the self-locking reamer measured by the wellhead test, and then lock the telescopic blade. The method can determine whether the telescopic blade is successfully locked based on the pump pressure difference value when the telescopic blade is in the locked and unlocked states when the starting displacement is activated. After confirming that the telescopic blade is successfully locked, reaming can be carried out to ensure that the reaming while drilling is carried out smoothly.

[0102] (5) This application provides a hydraulic self-locking drilling reamer method, which can accurately determine whether the telescopic cutter blade has been retracted to the correct position by changing the pump pressure, thus avoiding a stuck drill accident caused by the cutter blade not being retracted.

[0103] (6) This application provides a hydraulic self-locking reamer method, which can forcibly retract the telescopic blades. If the energy storage device fails and the telescopic blades cannot be retracted autonomously, the drill string can be lifted up, and the frictional resistance generated between the well wall and the telescopic blades can be used to force the shears to move the core tube, so that the telescopic blades lose their support and are automatically retracted into the body. This can effectively avoid stuck drill accidents caused by the self-locking reamer.

[0104] Although the present invention has been described above in conjunction with exemplary embodiments and accompanying drawings, those skilled in the art should understand that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A drilling method using a hydraulically self-locking reamer while drilling, characterized in that, The method includes the following steps: A modular drilling tool combines a hydraulically self-locking reamer, drill bit, and drill collar assembly into a single drilling tool assembly. The hydraulic self-locking reamer includes telescopic cutter wings, which are hydraulically controlled; the drill bit provides drilling hydraulic pressure for the hydraulic self-locking reamer; the drill collar assembly provides drilling pressure for the hydraulic self-locking reamer and the drill bit; and drilling is performed using the drill string assembly. The drilling method further includes: testing the first starting displacement and first pump pressure, second working displacement and second pump pressure, and third locking displacement and third pump pressure of the hydraulic self-locking reamer before starting drilling; The drilling method further includes: before starting drilling, confirming the fourth downhole working displacement based on the second pump pressure; confirming the fifth downhole locked displacement and the fourth pump pressure based on the third pump pressure; confirming whether the telescopic cutter wings are locked based on the fourth pump pressure and the first pump pressure; when the telescopic cutter wings are not locked, increasing the drilling fluid displacement until the telescopic cutter wings are locked, and updating the fifth downhole locked displacement and the fourth pump pressure; when the telescopic cutter wings are locked, increasing the drilling fluid displacement to the fifth downhole locked displacement, triggering the telescopic cutter wings to unlock, stopping the pump after running for a period of time, and automatically retracting the telescopic cutter wings into the body; The drilling method further includes: when the fourth pump pressure is less than the first pump pressure by 0.2-0.4 MPa, the telescopic cutter blade is successfully locked; when the fourth pump pressure is equal to or close to the first pump pressure, the telescopic cutter blade is not successfully locked, and the increase in drilling fluid discharge rate is 1-3 L / s each time.

2. The drilling method of the hydraulic self-locking reamer as described in claim 1, characterized in that, The drilling method also includes: Increase the drilling fluid discharge rate to no more than the first starting discharge rate and perform discharge circulation; Increase the drilling fluid discharge rate to the first starting discharge rate and record the fifth pump pressure at the current discharge rate; increase the drilling fluid discharge rate to the fourth downhole working discharge rate and return the rotary table or top drive torque to zero, and fully open the telescopic cutter wings; Increase the drilling fluid discharge rate to the fifth downhole locked discharge rate and lock the telescopic cutter wings; Reduce the drilling fluid discharge rate to the first starting discharge rate and record the pump pressure at this time (sixth pump pressure). The sixth pump pressure and the fifth pump pressure are used to confirm whether the telescopic cutter blade is locked; when the telescopic cutter blade is not locked, the drilling fluid discharge rate is increased and then reduced to the first starting discharge rate, and the sixth pump pressure is updated until the telescopic cutter blade is locked. Increase the drilling fluid to the fourth downhole working displacement and carry out enlarged hole drilling.

3. The drilling method using a hydraulic self-locking reamer as described in claim 2, characterized in that, The drilling method also includes: Reduce the drilling fluid discharge rate to the first starting discharge rate, and record the pump pressure at this time as the seventh pump pressure; Increase the drilling fluid discharge rate to the fifth downhole locked discharge rate, return the rotary table or top drive torque to zero, and rotate the drill string; Reduce the drilling fluid discharge rate to the first starting discharge rate, and record the pump pressure at this time as the eighth pump pressure; confirm whether the telescopic cutter blade is unlocked based on the seventh pump pressure and the eighth pump pressure.

4. The drilling method of the hydraulic self-locking reamer as described in claim 1, characterized in that, The drilling method also includes: The drill string assembly is lifted, and the friction between the wellbore and the telescopic cutter blades is used to shear the sliding mandrel inside the hydraulic self-locking reamer. The telescopic cutter blades then enter the hydraulic self-locking reamer, thus achieving forced retraction of the telescopic cutter blades.

5. The drilling method of the hydraulic self-locking reamer as described in claim 1, characterized in that, The drilling method also includes: When encountering resistance during tripping or descent, the drilling fluid is circulated, with the flow rate of the drilling fluid not exceeding the first starting flow rate, and the reaming speed is 40-50 rpm.

6. The drilling method of the hydraulic self-locking reamer as described in claim 2, characterized in that, The drilling method also includes: When the pressure of the sixth pump is 0.2-0.4 MPa less than the pressure of the fifth pump, the telescopic blade is successfully locked. When the sixth pump pressure is equal to or close to the fifth pump pressure, the telescopic blade is not successfully locked, and the increase in drilling fluid discharge is 1-3 L / s each time.

7. The drilling method for a hydraulically self-locking reamer as described in claim 3, characterized in that, The drilling method also includes: When the pressure of the seventh pump is 0.2-0.4 MPa less than the pressure of the eighth pump, the telescopic blade is successfully locked. When the pressure of the seventh pump and the pressure of the eighth pump are equal or close, the telescopic blade is not successfully locked, and the increase in drilling fluid discharge is 1-3 L / s each time.

8. A hydraulically self-locking reamer drilling device, characterized in that, The device is used to implement the hydraulic self-locking reamer drilling method according to any one of claims 1 to 7, and includes: a combined drill string module, a drill platform testing module, a wellhead testing module, a running-in module, a reamer drilling module, a retractable cutter wing recovery module, and a tripping-out module; wherein, The combined drill bit module is used to construct and control the drill bit assembly; The drilling rig test module is connected to the combined drilling tool module and is used to test the first starting displacement, second working displacement, third locking displacement and third pump pressure of the hydraulic self-locking drilling reamer. The wellhead testing module is connected to the drilling platform testing module and is used to test the fourth downhole working displacement, the fifth locked displacement and the fourth pump pressure, and to determine whether the telescopic cutter blade is locked based on the third pump pressure and the fourth pump pressure. The downhole module is connected to the combined drill string module and is used to control the drilling fluid discharge and reaming speed during the downhole process; The drilling reaming module is connected to the drilling platform test module and the wellhead test module, and is used to open the telescopic cutter wings, lock the telescopic cutter wings, detect the locking status of the telescopic cutter wings and control the reaming drilling according to the first starting displacement and the fifth downhole locking displacement. The retractable cutter wing recovery module is connected to the drilling platform test module and the wellhead test module, and is used to unlock the retractable cutter wing and test whether the cutter wing is recovered; The tripping module is connected to the combined drilling tool module and is used to control the drilling fluid discharge rate and reaming speed during the tripping process.

9. A computer device, characterized in that, include: At least one processor; A memory storing program instructions configured to be executed by the at least one processor, the program instructions including instructions for performing the hydraulically self-locking reamer drilling method according to any one of claims 1 to 7.

10. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, When the computer program instructions are executed by the processor, they implement the hydraulic self-locking drilling method with a reamer as described in any one of claims 1 to 7.

Images