Double-layer casing windowing sidetrack drilling test device and test method

Abstract

The invention belongs to the technical field of oil well windowing, and discloses a double-layer casing windowing sidetrack drilling test device and test method. The double-layer casing windowing sidetrack drilling test device comprises an inner-layer casing, an outer-layer casing, a filler, a guide piece and a drilling piece, the outer-layer casing is arranged outside the inner-layer casing in a sleeving mode, and an oil well with the double-layer casing can be simulated; the filling space between the inner-layer sleeve and the outer-layer sleeve can be filled with the filling material, and the filling material is used for simulating a cement sheath in actual construction; the guide piece fixed in the inner hole of the inner-layer sleeve is used for simulating a whipstock; a drilling part used for simulating a milling cone can move to be in contact with the guiding inclined face of the guiding part and move to be in contact with an inner-layer sleeve, a filling material or an outer-layer sleeve under the guiding of the guiding inclined face, the drilling part can mill the inner-layer sleeve, the filling material or the outer-layer sleeve through rotation so as to open windows and drill holes in the inner-layer sleeve, the filling material and the outer-layer sleeve, and the inner-layer sleeve, the filling material and the outer-layer sleeve can be driven by the drilling part to rotate. Double-layer casing windowing sidetrack drilling is simulated on the ground, and the success rate of actual windowing sidetrack drilling is increased.

Description

Technical Field

[0001] This invention relates to the field of oil well windowing technology, and in particular to a test device and test method for double-casing windowing side-drilling. Background Technology

[0002] Sidetracking with a window is a technique that involves creating a new window at a predetermined location within an existing wellbore using specific processes and tools, and then continuing drilling through this new window to form a new wellbore. This technique is commonly used for tapping the potential of old oilfields, handling downhole accidents or complex situations, and improving oil recovery rates.

[0003] When sidetracking deep wells with high-grade steel, high hardness, and thick walls, existing sidetracking techniques suffer from numerous problems, including severe wear and tear on the sidetracking cone and directional drilling tool, high consumption, slow progress, and even failure to open windows. To address these issues, existing technologies offer various surface sidetracking devices that simulate sidetracking in wells with single-casing tubing to ensure a high success rate in actual projects. However, wells constructed in complex geological conditions and under high formation pressure often use double-casing tubing. Existing surface sidetracking devices cannot effectively simulate sidetracking in wells with double-casing tubing, cannot quickly determine whether the selected sidetracking tools meet the requirements, and cannot guarantee a high success rate for sidetracking in double-casing wells in actual projects.

[0004] Therefore, there is an urgent need for a double-casing window-opening side-drilling test device and test method to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a test device and method for double-casing window-opening side-drilling, which can realistically simulate the window-opening side-drilling construction of double-casing oil wells on the ground, and select appropriate window-opening tools based on the simulation results, so as to improve the success rate and efficiency of oil well window-opening side-drilling.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On the one hand, a double-casing window-opening side-drilling test device is provided, comprising:

[0008] The first and second mounting components are arranged at intervals along a preset direction;

[0009] The inner sleeve has one end detachably connected to the first mounting component and the other end passing through the second mounting component;

[0010] The outer sleeve is located between the first mounting component and the second mounting component, and is fitted over the inner sleeve. A filling space is formed between the inner sleeve and the outer sleeve.

[0011] The filler material can fill the filling space;

[0012] The guide is located in the inner hole of the inner sleeve and is detachably connected to the wall of the inner sleeve. The guide is provided with a guide slope that is inclined in a preset direction.

[0013] A drilling component is located in the inner hole of the inner sleeve and can rotate relative to the inner sleeve. The drilling component can move to contact the guide slope and, guided by the guide slope, move to contact the tube wall, filler material, or tube wall of the outer sleeve to grind the tube wall, filler material, or tube wall of the inner sleeve.

[0014] A drilling drive is disposed on the side of the second mounting member opposite to the first mounting member. The output end of the drilling drive is connected to the drilling member and is used to drive the drilling member to move and rotate.

[0015] Optionally, the double-casing window-opening side-drilling test device also includes a mud pump and a first slurry delivery pipe. One end of the first slurry delivery pipe is connected to the mud pump, and the other end is connected to the inner casing. The mud pump is used to pump mud to the inner casing.

[0016] Optionally, the double-casing window-opening side-drilling test device also includes a protective sleeve fitted outside the outer casing. A sealed protective space is formed between the protective sleeve and the outer casing. After the outer casing is worn through, the mud entering the inner casing can flow into the protective space.

[0017] Optionally, the double-layer casing window-opening side-drilling test device also includes a first connecting ring plate and a second connecting ring plate coaxially arranged with the inner casing. One end of the protective cylinder is fixedly connected to the first connecting ring plate and the other end is fixedly connected to the second connecting ring plate. One end of the outer casing is fixedly connected to the first connecting ring plate and the other end is fixedly connected to the second connecting ring plate.

[0018] Optionally, an observation port is provided on the wall of the protective cylinder, and a cover is provided at the observation port that is detachably connected to the protective cylinder. When the cover is connected to the protective cylinder, the cover can block the observation port and make sealed contact with the protective cylinder. When the cover is separated from the protective cylinder, the observation port is unsealed.

[0019] Optionally, the double-casing window-opening side-drilling test device also includes a second slurry delivery pipe. The inner casing is provided with a slurry return port. One end of the second slurry delivery pipe is connected to the slurry return port, and the other end is connected to the mud pump. The mud in the inner casing can overflow from the slurry return port and be transported to the mud pump through the second slurry delivery pipe.

[0020] Optionally, a filter assembly is provided on the second slurry delivery pipe to filter the slurry overflowing from the slurry return port.

[0021] Optionally, the double-layer casing window-opening side-drilling test device also includes a connecting flange and a second fastener. The connecting flange is fixedly connected to the end of the inner casing away from the second mounting component, and the second fastener passes through the connecting flange and is fastened to the first mounting component.

[0022] Optionally, the double-casing window-opening side-drilling test device also includes a drill rod, one end of which is connected to the drilling component, and the other end is connected to the output end of the drilling drive component. The drilling drive component drives the drilling component to move and rotate through the drill rod.

[0023] On the other hand, a method for double-layer casing window-opening side-drilling test is provided, which uses the above-mentioned double-layer casing window-opening side-drilling test device to simulate the window-opening side-drilling test of double-layer casing, including the following steps:

[0024] S1. Activate the drilling drive and control the drilling component to move until it contacts the guide ramp.

[0025] S2. Control the drilling part to rotate and move along the guide slope. The drilling part will grind and mill the inner sleeve wall, the filler and the outer sleeve wall in sequence until the drilling part grinds and mills through the outer sleeve.

[0026] S3. Control the drilling component to stop rotating and control the drilling component to move away from the guide slope. After the drilling component separates from the guide slope, turn off the drilling drive component.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] This invention provides a double-casing window-opening side-drilling test device and method. The two ends of the inner casing are connected to a first mounting component and a second mounting component, respectively. The first and second mounting components restrict the movement of the inner casing, preventing vibration and impact damage to the test device and affecting the test results during the window-opening side-drilling test, thus ensuring safety and accuracy during the test. Specifically, the first and second mounting components can be used to simulate the soil surrounding the oil well. The outer casing is fitted over the inner casing, allowing the inner and outer casings to simulate a double-casing oil well. The filling space between the inner and outer casings is filled with filler material, enabling them to connect as a whole, enhancing the integrity between the inner and outer casings, and preventing external... The inner casing moves relative to the outer casing, meaning the filler material can be used to simulate the cement sheath in a double-cased well. The guide member has a guide ramp that guides the drill bit to contact the inner casing wall, filler material, or outer casing wall; the guide member simulates the directional drilling tool in a window-opening sidetracking operation. After the drill bit, guided by the guide ramp, contacts the inner casing wall, filler material, or outer casing wall, it can rotate to mill the inner casing wall, filler material, or outer casing wall, thus creating a window in both the inner and outer casings, simulating window-opening sidetracking operations on the surface. Furthermore, the included angle between the drill bit and the inner casing wall, filler material, or outer casing wall further facilitates milling of the drill bit. At this point, by observing the wear of the guide components and drilling components, as well as the success rate of window drilling, the staff can determine whether the selected guide components and drilling components are suitable, which helps to improve the success rate and efficiency of window drilling in underground oil wells. In addition, the inner casing is detachably connected to the first mounting component, which facilitates the replacement of the inner and outer casings after the test, enabling the reuse of the double-casing window drilling test device; moreover, separating the inner casing from the first mounting component also facilitates the removal of the guide components and drilling components inside the inner casing for staff observation. Attached Figure Description

[0029] Figure 1 This is a cross-sectional schematic diagram of the double-layer casing window-opening side drilling test device provided by the present invention;

[0030] Figure 2 This is a flowchart of the double-casing window-opening side-drilling test method provided by the present invention.

[0031] In the picture:

[0032] 1. First mounting component; 2. Second mounting component; 3. Inner sleeve; 31. Slurry return port; 4. Outer sleeve; 5. Filler; 6. Guide component; 61. Guide slope; 62. First threaded hole; 7. Drilling component; 71. Cooling hole; 8. Drilling drive component; 9. Fixing bolt; 10. Mud pump; 11. First slurry delivery pipe; 12. Protective cylinder; 121. Protective space; 122. Observation port; 13. First connecting ring plate; 14. Second connecting ring plate; 15. Second slurry delivery pipe; 16. Filter assembly; 161. Vibrating screen; 162. Settling tank; 17. Connecting flange; 18. Second fastener; 19. Drill rod. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0037] Example 1

[0038] like Figure 1 As shown in the figure, this embodiment provides a double-casing window-opening side-drilling test device, which can realistically simulate the window-opening side-drilling construction of double-casing oil wells on the ground, and select appropriate window-opening tools based on the simulation results to improve the success rate and efficiency of oil well window-opening side-drilling.

[0039] See Figure 1 The double-sleeve window-opening side-drilling test device includes a first mounting component 1, a second mounting component 2, an inner sleeve 3, an outer sleeve 4, filler material 5, a guide component 6, a drilling component 7, and a drilling drive component 8. The first mounting component 1 and the second mounting component 2 are arranged at intervals along a preset direction. One end of the inner sleeve 3 is detachably connected to the first mounting component 1, and the other end passes through the second mounting component 2. The outer sleeve 4 is located between the first mounting component 1 and the second mounting component 2, and is sleeved on the outside of the inner sleeve 3. A filling space is formed between the inner sleeve 3 and the outer sleeve 4. The filler material 5 can fill the filling space. The guide component 6 is located in the inner hole of the inner sleeve 3 and is connected to the inner sleeve 4. The sleeve 3 has a detachable connection to its wall. The guide member 6 is provided with a guide slope 61 that is inclined in a preset direction. The drilling member 7 is located in the inner hole of the inner sleeve 3 and can rotate relative to the inner sleeve 3. The drilling member 7 can move to contact the guide slope 61 and, guided by the guide slope 61, move to contact the wall of the inner sleeve 3, the filler 5, or the wall of the outer sleeve 4 to grind the wall of the inner sleeve 3, the filler 5, or the wall of the outer sleeve 4. The drilling drive member 8 is located on the side of the second mounting member 2 away from the first mounting member 1. The output end of the drilling drive member 8 is connected to the drilling member 7 and is used to drive the drilling member 7 to move and rotate.

[0040] The double-casing window-opening side-drilling test device provided in this embodiment has the inner casing 3 connected to the first mounting component 1 and the second mounting component 2 at both ends. The first mounting component 1 and the second mounting component 2 can restrict the movement of the inner casing 3, preventing vibration and impact during the window-opening side-drilling test from damaging the test device and affecting the test results, thus ensuring the safety of the test process and the accuracy of the test results. That is, the first mounting component 1 and the second mounting component 2 can be used to simulate the soil around the oil well. The outer casing 4 is sleeved on the inner casing 3, so that the inner casing 3 and the outer casing 4 can simulate a double-casing oil well. The filling space formed between the inner casing 3 and the outer casing 4 is filled with filler material 5, so that the inner casing 3 and the outer casing 4 can be connected as a whole, enhancing the integrity between the inner casing 3 and the outer casing 4, and preventing the outer casing 4 from being too close to the inner casing 3. The movement of the filler material 5 can simulate the cement sheath in a double-cased oil well. The guide member 6 is provided with a guide ramp 61, which can guide the drilling member 7 to move to contact the pipe wall of the inner casing 3, the filler material 5, or the pipe wall of the outer casing 4. That is, the guide member 6 can simulate the directional drilling tool in the window-opening side-drilling project of the oil well. After the drilling member 7 moves to contact the pipe wall of the inner casing 3, the filler material 5, or the pipe wall of the outer casing 4 under the guidance of the guide ramp 61, the drilling member 7 can grind and mill the pipe wall of the inner casing 3, the filler material 5, or the pipe wall of the outer casing 4 by rotating, so as to open a window in the inner casing 3, the filler material 5, and the outer casing 4, realizing the simulation of window-opening side-drilling construction of a double-cased oil well on the ground. Moreover, there is an included angle between the drilling member 7 and the pipe wall of the inner casing 3, the filler material 5, or the pipe wall of the outer casing 4, which makes it easier for the drilling member 7 to grind and mill. At this point, by observing the wear of the guide component 6 and the drilling component 7, as well as the success rate of window drilling, the staff can determine whether the selected guide component 6 and drilling component 7 are suitable, which helps to improve the success rate and efficiency of window drilling in underground oil wells. In addition, the inner casing 3 is detachably connected to the first mounting component 1, which facilitates the replacement of the windowed inner casing 3 and outer casing 4 after the test, realizing the reuse of the double casing window drilling test device; moreover, separating the inner casing 3 from the first mounting component 1 also facilitates the removal of the guide component 6 and drilling component 7 inside the inner casing 3 for staff to observe.

[0041] In this embodiment, the preset direction is vertical. The first mounting component 1 is the ground, and the second mounting component 2 is a concrete floor. The floor has perforations, and the end of the inner sleeve 3 away from the ground passes through the perforations. The ground and floor have high strength, which can more effectively restrict the movement of the inner sleeve 3.

[0042] In other embodiments, the preset direction is horizontal. The first mounting component 1 and the second mounting component 2 are made of concrete blocks or metal bases. The concrete blocks or metal bases can be firmly fixed on the ground and are not easy to move. Moreover, the concrete blocks or metal bases themselves have high rigidity, which can ensure the restriction effect on the displacement of the inner sleeve 3.

[0043] For example, the guide 6 is a slant, the drilling component 7 is a milling taper, and the drilling drive component 8 is a drilling rig, which can drive the milling taper to move and rotate. A drilling rig holder is provided on the drilling rig, and one end of the inner sleeve 3 passing through the second mounting component 2 is firmly held by the drilling rig holder, further preventing movement of the inner sleeve 3. Cement is used as the filler 5, and the length of the filler 5 along the extension direction of the inner sleeve 3 is the same as the length of the outer sleeve 4, ensuring the connection strength between the inner sleeve 3 and the outer sleeve 4.

[0044] See Figure 1 In this embodiment, the double-sleeve window-opening side-drilling test device also includes multiple fixing bolts 9. The inner sleeve 3 has a circular cross-sectional shape, and the inner sleeve 3 has first connecting holes that correspond one-to-one with the multiple fixing bolts 9 on its tube wall. The multiple first connecting holes are spaced apart along the circumference of the inner sleeve 3. The guide member 6 has a circular cross-sectional shape, and the guide member 6 has multiple first threaded holes 62 that correspond one-to-one with the multiple first connecting holes. The fixing bolts 9 pass through the corresponding first connecting holes and are threadedly connected to the corresponding first threaded holes 62 to firmly fix the guide member 6 to the tube wall of the inner sleeve 3, so as to prevent the guide member 6 from moving and rotating during the milling process.

[0045] Optionally, see Figure 1 The double-casing window-opening side-drilling test device also includes a mud pump 10 and a first slurry delivery pipe 11. One end of the first slurry delivery pipe 11 is connected to the mud pump 10, and the other end is connected to the inner casing 3. The mud pump 10 is used to pump mud to the inner casing 3. During the window-opening drilling process, the mud can enter the inner casing 3 through the first slurry delivery pipe 11 under the power of the mud pump 10 to cool the drill bit 7, prevent the drill bit 7 from overheating due to friction and being damaged. In addition, the mud can also play a lubricating role, reducing the friction between the drill bit 7 and the pipe wall of the inner casing 3, the filler 5, or the pipe wall of the outer casing 4, extending the service life of the drill bit 7 and improving drilling efficiency.

[0046] In this embodiment, see Figure 1 The drilling component 7 is a milling cone. Cooling holes 71 are provided on the cutting edge of the milling cone. The other end of the first slurry pipe 11 is connected to the milling cone. The slurry enters the milling cone through the first slurry pipe 11 and is sprayed out through the cooling holes 71 into the inner sleeve 3.

[0047] Optionally, see Figure 1The double-casing window-opening side-drilling test device also includes a protective cylinder 12 fitted over the outer casing 4. A sealed protective space 121 is formed between the protective cylinder 12 and the outer casing 4. After the outer casing 4 is worn through, the drilling mud entering the inner casing 3 can flow into the protective space 121. The protective cylinder 12, fitted over the outer casing 4, can prevent the drilling mud from flowing through the milled hole to the ground around the double-casing window-opening side-drilling test device after the drilling element 7 mills through the outer casing 4, thus ensuring the cleanliness of the test environment.

[0048] In this embodiment, see Figure 1 The protective sleeve 12 is connected to the inner sleeve 3. Specifically, the double-sleeve window-opening side-drilling test device also includes a first connecting ring plate 13 and a second connecting ring plate 14 coaxially arranged with the inner sleeve 3. One end of the protective sleeve 12 is fixedly connected to the first connecting ring plate 13, and the other end is fixedly connected to the second connecting ring plate 14. One end of the outer sleeve 4 is fixedly connected to the first connecting ring plate 13, and the other end is fixedly connected to the second connecting ring plate 14. The outer sleeve 4, the protective sleeve 12, the first connecting ring plate 13, and the second connecting ring plate 14 together form a protective space 121, and the inner sleeve 3, the outer sleeve 4, the first connecting ring plate 13, and the second connecting ring plate 14 together form a filling space. The first connecting ring plate 13 and the second connecting ring plate 14 can fix the protective cylinder 12 to the inner sleeve 3 and also seal both ends of the protective cylinder 12 to ensure the airtightness of the protective space 121. Moreover, the first connecting ring plate 13 and the second connecting ring plate 14 can also seal both ends of the outer sleeve 4, serving as a template for cement molding to prevent cement from leaking out of the filling space. The first connecting ring plate 13 and the second connecting ring plate 14 are connected to both the outer sleeve 4 and the protective cylinder 12, which can enhance the integrity between the inner sleeve 3, the outer sleeve 4 and the protective cylinder 12, and ensure the safety of the double-sleeve window-opening side-drilling test device during use.

[0049] For example, see Figure 1 In the configuration, the inner sleeve 3, outer sleeve 4, protective cylinder 12, first connecting ring plate 13, and second connecting ring plate 14 are all made of steel. The inner walls of the first connecting ring plate 13 and the second connecting ring plate 14 are welded to the wall of the inner sleeve 3. The outer walls of the first connecting ring plate 13 and the second connecting ring plate 14 are welded to the inner wall of the protective cylinder 12. The upper surface of the first connecting ring plate 13 is welded to the lower surface of the outer sleeve 4, and the lower surface of the second connecting ring plate 14 is welded to the upper surface of the outer sleeve 4. The welded connection has high strength and can also ensure the airtightness of the connection, thereby ensuring the airtightness of the protective space 121 and the filling space.

[0050] In other embodiments, the protective cylinder 12 is connected to the outer sleeve 4. Specifically, the first connecting ring plate 13 and the second connecting ring plate 14 are both sleeved on the outer sleeve 4. One end of the protective cylinder 12 is fixedly connected to the first connecting ring plate 13, and the other end is fixedly connected to the second connecting ring plate 14. The outer sleeve 4, the protective cylinder 12, the first connecting ring plate 13 and the second connecting ring plate 14 together form a protective space 121.

[0051] For example, the outer sleeve 4, the protective cylinder 12, the first connecting ring plate 13 and the second connecting ring plate 14 are all made of steel. The inner hole wall of the first connecting ring plate 13 and the inner hole wall of the second connecting ring plate 14 are welded to the outer wall of the outer sleeve 4, and the outer wall of the first connecting ring plate 13 and the outer wall of the second connecting ring plate 14 are welded to the inner hole wall of the protective cylinder 12 to ensure the airtightness of the protective space 121.

[0052] Optionally, see Figure 1 An observation port 122 is provided on the wall of the protective cylinder 12. A cap (not shown in the figure) is detachably connected to the protective cylinder 12 at the observation port 122. When the cap is connected to the protective cylinder 12, the cap can block the observation port 122 and make a sealed contact with the protective cylinder 12. When the cap is separated from the protective cylinder 12, the observation port 122 is unsealed. The cap blocking the observation port 122 and making a sealed contact with the protective cylinder 12 can ensure the airtightness of the protective space 121 and prevent mud from flowing out. The protective cylinder 12 and the cap are detachably connected, so that the cap can be removed from the protective cylinder 12 so that the operator can observe through the observation port 122 whether the drilled part 7 has milled through the outer casing 4.

[0053] In this embodiment, a sealing ring is provided on the protective cylinder 12, arranged circumferentially along the observation port 122. The sealing ring is located between the cover and the protective cylinder 12 to achieve a sealed contact between the cover and the protective cylinder 12. For example, the sealing ring is a rubber ring, which is bonded or vulcanized to the outer wall of the protective cylinder 12; alternatively, a sealing groove is recessed on the outer surface of the protective cylinder 12, the rubber ring is fitted into the sealing groove, and a portion of the rubber ring protrudes from the outer surface of the protective cylinder 12, allowing the rubber ring to fully contact the cover and ensure a sealing effect.

[0054] Furthermore, the double-casing window-opening side-drilling test device also includes a first fastener, which passes through the cover and is threadedly connected to the protective cylinder 12 to achieve a detachable connection between the protective cylinder 12 and the cover. For example, the first fastener is a bolt, the protective cylinder 12 is provided with a second threaded hole, the cover is provided with a second connecting hole, and the bolt passes through the second connecting hole and is threadedly connected to the second threaded hole.

[0055] Optionally, see Figure 1The double-casing window-opening side-drilling test device also includes a second slurry delivery pipe 15. The inner casing 3 is provided with a slurry return port 31. One end of the second slurry delivery pipe 15 is connected to the slurry return port 31, and the other end is connected to the mud pump 10. The mud in the inner casing 3 can overflow from the slurry return port 31 and be transported to the mud pump 10 via the second slurry delivery pipe 15. The debris from the inner casing 3, the filler 5, and the outer casing 4 milled by the drilling element 7 can be suspended in the mud and overflow from the slurry return port 31 along with the mud, so as to avoid the accumulation of debris at the borehole and cause blockage. Moreover, the mud pump 10, the first slurry delivery pipe 11, the inner casing 3, the protective sleeve 12, the slurry return port 31, and the second slurry delivery pipe 15 can form a closed mud flow pipeline, so that the mud can be recycled and save test costs.

[0056] Specifically, before the outer casing 4 is worn through, mud is continuously injected into the inner casing 3, causing the water level in the inner casing 3 to rise continuously. As a result, the mud can overflow from the return port 31 and be transported to the mud pump 10 through the second mud delivery pipe 15, so as to realize the recycling of mud. After the outer casing 4 is worn through, the mud will enter the protective space 121 through the milled borehole.

[0057] For example, see Figure 1 The preset direction is vertical, and the elevation of the return slurry port 31 is higher than the elevation of the milled borehole to prevent the mud from flowing out directly from the return slurry port 31 under gravity without acting on the inner casing 3 wall.

[0058] Optionally, see Figure 1 A filter assembly 16 is provided on the second slurry delivery pipe 15 to filter the slurry overflowing from the return slurry port 31. The slurry overflowing from the return slurry port 31 contains suspended pipe wall debris and filler material 5. The filter assembly 16 can remove the pipe wall debris and filler material 5 from the slurry, so that the slurry delivered to the slurry pump 10 through the second slurry delivery pipe 15 does not contain other impurities and the slurry can be reused.

[0059] For example, see Figure 1 The filter assembly 16 includes a vibrating screen 161 and a settling tank 162. The vibrating screen 161 can screen the slurry containing suspended pipe wall debris and filler 5 through vibration, thereby removing the pipe wall debris and filler 5 from the slurry. The settling tank 162 can allow the pipe wall debris and filler 5 to settle to the bottom through gravity, thereby separating the pipe wall debris and filler 5 from the slurry. The simultaneous use of the vibrating screen 161 and the settling tank 162 can improve the filtration effect. Specifically, the second slurry conveying pipe 15 includes a first section, a second section, and a third section. The two ends of the first section are connected to the slurry return port 31 and the vibrating screen 161, respectively. The two ends of the second section are connected to the vibrating screen 161 and the settling tank 162, respectively. The two ends of the third section are connected to the settling tank 162 and the slurry pump 10, respectively.

[0060] Optionally, see Figure 1 The double-layer casing window-opening side-drilling test device also includes a connecting flange 17 and a second fastener 18. The connecting flange 17 is fixedly connected to the end of the inner casing 3 away from the second mounting part 2. The second fastener 18 passes through the connecting flange 17 and is fastened to the first mounting part 1 to connect the inner casing 3 to the first connecting part. The connection through the connecting flange 17 provides a high connection strength between the inner casing 3 and the first mounting part 1, and the connecting flange 17 can withstand high pressure and high torque to ensure that the connection between the inner casing 3 and the first mounting part 1 will not loosen or break.

[0061] For example, the inner sleeve 3 is made of steel, and the connecting flange 17 is welded to the bottom of the inner sleeve 3; the second fastener 18 is a bolt, the first mounting part 1 is the ground, and the bolt passes through the connecting flange 17 and is anchored to the ground.

[0062] Optionally, see Figure 1 The double-casing window-opening side-drilling test device also includes a drill rod 19. One end of the drill rod 19 is connected to the drilling component 7, and the other end is connected to the output end of the drilling drive component 8. The drilling drive component 8 drives the drilling component 7 to move and rotate through the drill rod 19. The drill rod 19 can increase the distance between the drilling component 7 and the drilling drive component 8, so that the drilling component 7 can extend into the inner hole of the inner casing 3 and move accurately to the position to be drilled.

[0063] In this embodiment, see Figure 1 In the orientation of the drill rod 19, a slurry passage hole is provided on the drill rod 19, which extends through the drill rod 19. The end of the first slurry delivery pipe 11 away from the mud pump 10 is connected to the upper end of the slurry passage hole. The drilling component 7 is fixed to the lower end of the drill rod 19. The drilling component 7 is a milling cone. The cutting edge of the milling cone is provided with a cooling hole 71. The cooling hole 71 is connected to the slurry passage hole. The mud enters the slurry passage hole through the first slurry delivery pipe 11, then enters the milling cone through the slurry passage hole, and finally is sprayed through the cooling hole 71 between the cutting edge and the inner sleeve 3.

[0064] See Figure 1 In this embodiment, the assembly process of the double-layer casing window-opening side-drilling test device is as follows:

[0065] Select appropriate guide components 6 and drilling components 7 according to the conditions of the oil well to be side-drilled. Place the inner casing 3 horizontally to facilitate the assembly of other components. Weld the connecting flange 17 to one end of the inner casing 3. Insert the guide component 6 into the inner hole of the inner casing 3 from the other end of the inner casing 3 and fix the guide component 6 to the pipe wall of the inner casing 3 using fixing bolts 9. Slide the first connecting ring plate 13 from the other end of the inner casing 3 to the outside of the inner casing 3 and weld the first connecting ring plate 13 to the pipe wall of the inner casing 3. Then slide the outer casing 4 from the other end of the inner casing 3 to the outside of the inner casing 3. The outer sleeve 4 is welded to the surface of the first connecting ring plate 13 away from the connecting flange 17 at one end. The protective sleeve 12 is then fitted over the outer sleeve 4 from the other end of the inner sleeve 3, and the protective sleeve 12 is welded to the first connecting ring plate 13 at one end near the connecting flange 17. The inner sleeve 3 is changed from a horizontal to a vertical position, with the connecting flange 17 positioned below the first connecting ring plate 13, and the first connecting ring plate 13 positioned below the outer sleeve 4. The filler 5, i.e., cement, is poured between the inner sleeve 3 and the outer sleeve 4 from the side away from the first connecting ring plate 13. The connecting ring plate 13 restricts the flow of cement out of the filling space; after the cement has solidified for 48 hours, the second connecting ring plate 14 is fitted from the other end of the inner sleeve 3 to the outside of the inner sleeve 3, with the second connecting ring plate 14 positioned above the outer sleeve 4, and the second connecting ring plate 14 is welded to the inner sleeve 3, the outer sleeve 4, and the protective cylinder 12; the drilling drive 8, i.e., the drilling rig, is installed on the second mounting component 2, i.e., the floor, and a drilling rig holder is installed on the drilling rig; the cover is fixed to the protective cylinder 12 with the first fastener to block the observation port 122; the inner sleeve 3 is moved, and one end of the inner sleeve 3 is connected to the connecting flange 17. Anchored to the ground by the second fastener 18, the end of the inner sleeve 3 facing away from the connecting flange 17 passes through the floor, and the end of the inner sleeve 3 passing through the floor is clamped by the drill rig clamp; one end of the drill rod 19 is connected to the drilling component 7, and the drill rod 19 is inserted into the inner sleeve 3, and then the other end of the drill rod 19 is connected to the output end of the drilling drive component 8; the first slurry pipe 11 is connected to the mud pump 10 and the drill rod 19, and the return slurry port 31 is connected to the filter component 16 and the filter component 16 is connected to the mud pump 10 by the second slurry pipe 15. At this time, the assembly of the double sleeve window side drilling test device is completed.

[0066] Example 2

[0067] like Figure 2 As shown, this embodiment provides a method for double-layer casing window-opening side-drilling test. The method uses the double-layer casing window-opening side-drilling test device from Embodiment 1 to simulate a double-layer casing window-opening side-drilling test, specifically including the following steps:

[0068] S1. Activate the drilling drive component 8 and control the drilling component 7 to move until it contacts the guide slope 61.

[0069] Before the drilling drive 8 is activated, there is still a certain distance between the drilling part 7 and the guide slope 61. The drilling drive 8 can guide the drilling part 7 to move in a preset direction so that the drilling part 7 can gradually approach the guide slope 61. Moreover, in this step, the drilling drive 8 can only drive the drilling part 7 to move without driving the drilling part 7 to rotate, thus saving test costs.

[0070] S2. Control the drilling component 7 to rotate and move along the guide slope 61. The drilling component 7 will grind the inner sleeve 3, the filler 5 and the outer sleeve 4 in sequence until the drilling component 7 grinds through the outer sleeve 4.

[0071] After the drilling part 7 contacts the guide slope 61, the drilling part 7 can only move along the guide slope 61, and then gradually comes into contact with the tube wall of the inner sleeve 3. At this time, the drilling part 7 can grind the tube wall of the inner sleeve 3 by rotating. After the tube wall of the inner sleeve 3 is worn through, the drilling part 7 will grind the filler 5. After the filler 5 is worn through, the drilling part 7 will grind the tube wall of the outer sleeve 4. After the tube wall of the outer sleeve 4 is worn through, the window side drilling of the double sleeve is completed.

[0072] Further, see Figure 1 In the middle position, while the drilled part 7 is being milled, the mud pump 10 and the vibrating screen 161 are also turned on. The mud pump 10 delivers mud to the drilled part 7 through the first mud delivery pipe 11 and the drill rod 19. The mud is sprayed out from the cooling hole 71 on the drilled part 7 to cool the drilled part 7 and reduce the friction between the drilled part 7 and the pipe wall. Before the outer casing 4 is worn through, the mud sprayed from the cooling hole 71 accumulates above the guide 6, and the water level in the inner casing 3 rises continuously. The mud overflows from the return port 31 and is transported to the vibrating screen 161 for filtration through the first section of the second slurry pipe 15. The filtered mud is then transported to the settling tank 162 for filtration through the second section of the second slurry pipe 15. After two filtrations, the mud is transported to the mud pump 10 through the third section of the second slurry pipe 15, realizing the recycling of mud in the double casing window side drilling test device. After the outer casing 4 is worn through, the mud enters the protective space 121 from the milled borehole.

[0073] S3. Use the drilling drive 8 to control the drilling component 7 to stop rotating and control the drilling component 7 to move away from the guide slope 61. After the drilling component 7 separates from the guide slope 61, turn off the drilling drive 8.

[0074] In this embodiment, before the drilling component 7 stops rotating, the mud pump 10 and the vibrating screen 161 need to be turned off to stop the continued delivery of mud to the inner casing 3.

[0075] During the above process, the operator can open the observation port 122 to observe the milling process. Specifically, the first fastener is tightened to separate the first fastener from the cover and the protective cylinder 12, and the cover is removed from the protective cylinder 12.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A dual casing window sidetracking test device, characterized in that, include: The first mounting component (1) and the second mounting component (2) are arranged at intervals along a preset direction; The inner sleeve (3) is detachably connected at one end to the first mounting member (1) and at the other end passes through the second mounting member (2); The outer sleeve (4) is located between the first mounting member (1) and the second mounting member (2) and is sleeved on the outside of the inner sleeve (3). A filling space is formed between the inner sleeve (3) and the outer sleeve (4). The filler (5) is capable of filling the filling space; The guide (6) is located in the inner hole of the inner sleeve (3) and is detachably connected to the tube wall of the inner sleeve (3). The guide (6) is provided with a guide slope (61) that is inclined along the preset direction. A drilling component (7) is located in the inner hole of the inner sleeve (3) and can rotate relative to the inner sleeve (3). The drilling component (7) can move to contact the guide slope (61) and move under the guidance of the guide slope (61) to contact the tube wall of the inner sleeve (3), the filler (5) or the tube wall of the outer sleeve (4) to mill the tube wall of the inner sleeve (3), the filler (5) or the tube wall of the outer sleeve (4). A drilling drive (8) is disposed on the side of the second mounting member (2) away from the first mounting member (1). The output end of the drilling drive (8) is connected to the drilling member (7) and is used to drive the drilling member (7) to move and rotate.

2. The double-casing window-opening side-drilling test device according to claim 1, characterized in that, The double-casing window-opening side-drilling test device also includes a mud pump (10) and a first slurry delivery pipe (11). One end of the first slurry delivery pipe (11) is connected to the mud pump (10), and the other end is connected to the inner casing (3). The mud pump (10) is used to pump mud to the inner casing (3).

3. The double-casing window-opening side-drilling test device according to claim 2, characterized in that, The double-casing window-opening side-drilling test device also includes a protective cylinder (12) sleeved outside the outer casing (4). A sealed protective space (121) is formed between the protective cylinder (12) and the outer casing (4). After the outer casing (4) is worn through, the mud entering the inner casing (3) can flow into the protective space (121).

4. The double-casing window-opening side-drilling test device according to claim 3, characterized in that, The double-layer casing window-opening side-drilling test device also includes a first connecting ring plate (13) and a second connecting ring plate (14) coaxially arranged with the inner casing (3). One end of the protective cylinder (12) is fixedly connected to the first connecting ring plate (13), and the other end is fixedly connected to the second connecting ring plate (14). One end of the outer casing (4) is fixedly connected to the first connecting ring plate (13), and the other end is fixedly connected to the second connecting ring plate (14).

5. The double-casing window-opening side-drilling test device according to claim 3, characterized in that, The protective cylinder (12) has an observation port (122) on its wall. The observation port (122) is provided with a cap that is detachably connected to the protective cylinder (12). When the cap is connected to the protective cylinder (12), the cap can block the observation port (122) and make a sealed contact with the protective cylinder (12). When the cap is separated from the protective cylinder (12), the observation port (122) is unsealed.

6. The double-casing window-opening side-drilling test device according to claim 2, characterized in that, The double-layer casing window-opening side drilling test device also includes a second slurry delivery pipe (15). The inner casing (3) is provided with a slurry return port (31). One end of the second slurry delivery pipe (15) is connected to the slurry return port (31), and the other end is connected to the mud pump (10). The mud in the inner casing (3) can overflow from the slurry return port (31) and be transported to the mud pump (10) via the second slurry delivery pipe (15).

7. The double-casing window-opening side-drilling test device according to claim 6, characterized in that, The second slurry delivery pipe (15) is provided with a filter assembly (16) for filtering the slurry overflowing from the slurry return port (31).

8. The double-casing window-opening side-drilling test apparatus according to any one of claims 1-7, characterized in that, The double-layer sleeve window side drilling test device also includes a connecting flange (17) and a second fastener (18). The connecting flange (17) is fixedly connected to the end of the inner sleeve (3) away from the second mounting part (2). The second fastener (18) passes through the connecting flange (17) and is fastened to the first mounting part (1).

9. The double-casing window-opening side-drilling test apparatus according to any one of claims 1-7, characterized in that, The double-layer casing window side drilling test device also includes a drill rod (19), one end of which is connected to the drilling component (7), and the other end is connected to the output end of the drilling drive component (8). The drilling drive component (8) drives the drilling component (7) to move and rotate through the drill rod (19).

10. A method for side drilling with a double-layer casing and a window opening, characterized in that, The simulation of a double-casing window-opening side-drilling test using the double-casing window-opening side-drilling test apparatus as described in any one of claims 1-9 includes the following steps: S1. Activate the drilling drive (8) and control the drilling component (7) to move to contact the guide slope (61); S2. Control the drilling component (7) to rotate and move along the guide slope (61). The drilling component (7) will grind the inner sleeve (3), the filler (5) and the outer sleeve (4) in sequence until the drilling component (7) grinds through the outer sleeve (4). S3. Control the drilling component (7) to stop rotating and control the drilling component (7) to move away from the guide slope (61). After the drilling component (7) separates from the guide slope (61), turn off the drilling drive component (8).

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