Local reverse circulation single-acting double-pipe drilling tool for salt lake drilling
By designing a local reverse circulation single-action double-tube drilling tool for salt lake drilling, the problems of low heart rate and core fallout under pump-free drilling conditions are solved, and more efficient drilling and core adoption are achieved.
Patent Information
- Application Number
- CN202421939819.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-08-12
AI Technical Summary
During the drilling process of salt lakes, existing single-action double-tube drilling tools have problems such as low heart rate, collapse in holes and core fallout under the conditions of no pump drilling, which is difficult to meet the needs of salt lake resource exploration.
A local reverse circulation single-action double-tube drilling tool for salt lake drilling is designed, including a variable diameter receiver assembly, a single-action mechanism of the elastic clamp, a local reverse circulation mechanism and a core clamping protection mechanism. Through the combination of these mechanisms, the drilling efficiency and core adoption rate are improved.
The core adoption rate is improved, the aging efficiency of the single-acting mechanism is enhanced, the core falls off, and the degree of core disturbance is reduced.
Smart Images
Figure CN222848177U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of geological engineering and technology, in particular to a local reverse circulation single-action double-tube drilling and coring device for salt lake drilling, and in particular to a local reverse circulation single-action double-tube drilling tool for salt lake drilling. Background Art
[0002] In recent years, the scale of salt lake resource concentration areas has continued to expand, but the output has not reached a corresponding scale, which also reflects that the previous exploration results cannot meet the requirements of later development investment. According to the current status of the Quaternary exploration in the Qarhan Salt Lake, Yiliping, East and West Taijinaier and other mining areas in recent years, insufficient coring rate, hole collapse and scrapping, and hydrological wells have become the main problems restricting the quality of salt lake resource exploration and exploration tasks.
[0003] Through follow-up investigation, it was found that in order to avoid the salt layer from being dissolved, the pumpless drilling method was used during the drilling process. When drilling in strata with plasticity and fluidity characteristics, the ordinary single-action double-tube coring drill not only has a low coring rate, but also often has accidents such as silt sedimentation blocking the follower tube and the coring drill during drilling; during the process of pulling out the drill, the ordinary inner tube retaining spring cannot ensure that the residual core does not fall. Based on the above reasons, it is necessary to design and develop a set of single-action double-tube drill tools under pumpless drilling conditions. Utility Model Content
[0004] The utility model is to solve the technical problems existing in the background technology and provide a local reverse circulation single-action double-tube drilling tool for salt lake drilling. The utility model improves the core recovery rate, improves the timeliness of the single-action mechanism, prevents the core from falling off, and reduces the degree of core disturbance.
[0005] The technical solution of the utility model is as follows: the utility model is a local reverse circulation single-action double-tube drilling tool for salt lake drilling, and its special feature is that the local reverse circulation single-action double-tube drilling tool for salt lake drilling comprises a reducer assembly, a spring-clip single-action mechanism, a local reverse circulation mechanism, a core clamping protection mechanism and an outer tube, the reducer assembly, the spring-clip single-action mechanism and the local reverse circulation mechanism are arranged in the outer tube from top to bottom in sequence, the reducer assembly comprises a reducer, a hole expansion washer and a drill pipe reducer, the reducer has a hollow structure inside, the hole expansion washer has a hollow structure inside and is arranged around the middle position of the reducer, the drill pipe reducer has a hollow structure, the upper end of the drill pipe reducer is connected to the lower end of the reducer, and the lower end is connected to the spring-clip single-action mechanism, the hole expansion washer is located outside the upper end of the outer tube, and the core clamping protection mechanism is connected to the lower end of the outer tube.
[0006] Furthermore, the spring-cage single-action mechanism includes a spring-cage adjusting screw, a spring-cage adjusting nut, an upper support platform of the spring-cage cavity, a spring-cage cavity, a spring-cage takeover, a spring, a spring-cage cavity pressure bearing, a lower support platform of the spring-cage cavity, a rolling bearing, an upper pressure bearing of the single-action cavity, a single-action cavity, a single-action cavity transmission shaft, a lower support platform of the single-action cavity and a lower pressure bearing of the single-action cavity. The upper part of the spring-cage adjusting screw passes through the reducer takeover assembly, and the lower end is connected to the spring-cage takeover. The spring-cage adjusting nut is arranged on the spring-cage adjusting screw; the spring-cage cavity is a hollow structure, the upper end of which is connected to the lower end of the drill rod reducer of the drilling tool, and the lower end is connected to the lower support platform of the spring-cage cavity; the lower support platform of the spring-cage cavity is an inverted T-shaped structure, the interior of which is a hollow structure, and the upper end is connected to the spring-cage cavity The lower end is connected, the pressure bearing of the ejection card cavity is arranged at the upper end of the lower support platform of the ejection card cavity, and is located in the ejection card cavity; the ejection card receiver is arranged at the lower end of the lower support platform of the ejection card cavity, and is divided into three parts: upper, middle and lower. The upper part is a connecting shaft, which runs through the ejection card cavity, and the upper end of the connecting shaft is connected to the ejection card adjusting screw. The lower support platform of the ejection card cavity is sleeved in the middle of the ejection card receiver, and the lower end of the lower part of the ejection card receiver is connected to the upper end of the single-action cavity, and the spring is arranged around the outside of the connecting shaft; the upper support platform of the ejection card cavity is a T-shaped structure, and the interior is a hollow structure. The ejection card adjusting screw passes through the upper support platform of the ejection card cavity, and the lower end is connected to the upper end of the connecting shaft; the interior of the single-action cavity is a hollow structure, and the uppermost end of the single-action cavity is connected to the lowermost end of the ejection card receiver. There are two inner steps from top to bottom in the middle of the single-acting chamber; the single-acting chamber transmission shaft passes through the single-acting chamber, and the single-acting chamber transmission shaft is divided into six parts from top to bottom: a locking latch part, a single-acting chamber upper pressure bearing and a rolling bearing insertion part, an upper step load-bearing part, a lower step load-bearing fixed part, a single-acting chamber lower pressure bearing insertion fixed part and a local reverse circulation inner pipe connection part. The locking latch part is located at the top of the single-acting chamber transmission shaft, and threads and latch holes are provided on the outside of the locking latch part. The rolling bearing is inserted into the upper end of the single-acting chamber upper pressure bearing and the rolling bearing insertion part, and the single-acting chamber upper pressure bearing is inserted into the lower end of the single-acting chamber upper pressure bearing and the rolling bearing insertion part. The locking pin is used to fix the pressure bearing and rolling bearing on the single-acting chamber to loosen upward after the fixing nut is inserted into the locking pin. The upper step load-bearing part and the lower step load-bearing fixed part correspond to the positions of the two inner steps in the single-acting chamber. The pressure bearing of the single-acting chamber is inserted into the fixed part. A hole is vertically arranged in the center of the inner side of the local reverse circulation inner pipe connection part. Steel balls are arranged in the hole. An exhaust hole connected to the hole is horizontally arranged at the upper end of the local reverse circulation inner pipe connection part. The diameter of the exhaust hole is smaller than the diameter of the steel balls. The lower support platform of the single-acting chamber is an inverted T-shaped structure with a hollow structure inside. The single-acting chamber transmission shaft passes through the lower support platform of the single-acting chamber, and the upper end of the lower support platform of the single-acting chamber is connected to the lower end of the single-acting chamber.
[0007] Furthermore, the local reverse circulation mechanism includes a locking nut, an inner tube handle, a filter locking mechanism and an inner tube; the locking nut is arranged at the lower end of the single-acting chamber transmission shaft; the inner tube handle is a T-shaped structure with a hollow structure inside, located below the locking nut, and connected to the lower end of the single-acting chamber transmission shaft, the reverse circulation mechanism is arranged in the inner tube, and the filter locking mechanism includes a through screw, a filter cup and a filter; the through screw is a hollow structure with an inner diameter smaller than the diameter of the steel ball, and is connected to the lower end of the single-acting chamber transmission shaft; the filter cup includes a cup body and a cup cover, the cup cover is arranged on the cup body, the filter is arranged between the cup body and the cup cover, concentric water holes are left in the center of the cup cover and the center of the bottom of the cup body, the upper part of the through screw is connected to the water hole of the cup cover, and the lower part passes through the water hole of the cup body, the upper end of the inner tube is connected to the lower end of the inner tube handle, and the lower end is connected to the core clamping protection mechanism.
[0008] Furthermore, the core clamping protection mechanism includes a retaining spring seat and a telescopic retaining spring. The retaining spring seat is cylindrical, and a guide groove passes vertically downward through the lower part of the side wall. There are multiple guide grooves, which are arranged around the retaining spring seat. A steel ring is horizontally arranged around the inner side of the lower end of the guide groove. The telescopic retaining spring includes a steel ring and a retaining spring sheet. The retaining spring sheet is arranged on the steel ring. There are multiple retaining spring sheets corresponding to the guide groove, which are arranged around the steel ring. The steel ring is arranged in the retaining spring seat and can slide up and down along the retaining spring seat. The retaining spring sheet is a spring sheet with an arc, which can slide up and down along the guide groove, and the lower end extends to the outside of the steel ring.
[0009] Furthermore, a plurality of slots are arranged around the outer wall of the steel ring, and the arrangement position is consistent with the guide slot position. A through hole is arranged in the middle of the slot. The upper end of the retaining spring is embedded in the steel ring slot and connected to the steel ring through the steel ring rivet and the through hole.
[0010] Furthermore, four alloy blocks are evenly distributed vertically on the hole-expanding washer, and are inserted into the middle position of the reducer.
[0011] Furthermore, the mesh size of the filter is 160 meshes or 200 meshes.
[0012] Furthermore, an oil filling nozzle or an oil filling window is provided at the upper end of the single-action chamber.
[0013] The utility model designs a local reverse circulation single-action double-tube drilling tool for salt lake drilling item by item through analyzing factors such as the pumping mechanism of a pumpless joint, the timeliness and effect of a single-action mechanism, the elasticity of a spring-clip mechanism, the principle of a spring-clip seat to prevent core shedding, the inner and outer annular space gaps between a drill bit and a drill tool, and adaptability. The utility model is composed of 5 sets of mechanisms, namely, a reducer joint assembly, an outer tube composition mechanism, a spring-clip single-action mechanism, a local reverse circulation mechanism, and a core clamping protection mechanism. The reducer assembly includes a reducer, a hole expansion washer, and a drill pipe reducer; the outer tube component includes an outer tube and a drill bit; the spring-cage single-action mechanism includes a spring-cage adjustment screw, a spring-cage adjustment nut, an upper support platform of the spring-cage cavity, a spring-cage cavity, a spring-cage receiver, a spring, a spring-cage cavity pressure bearing, a lower support platform of the spring-cage cavity, a rolling bearing, an upper pressure bearing of the single-action cavity, a single-action cavity, a single-action cavity transmission shaft, a lower support platform of the single-action cavity, and a lower pressure bearing of the single-action cavity; the local reverse circulation mechanism includes a locking nut, an inner tube receiver, a reverse circulation mechanism, and an inner tube; the core clamping protection mechanism includes a retaining spring seat and a telescopic retaining spring. The utility model first connects the spring card single action mechanism, the local reverse circulation mechanism and the inner tube in sequence to form an inner tube assembly; secondly, after the core clamping protection mechanism is installed into the upper end of the inner step of the drill bit, the outer tube and the drill bit are connected to form an outer tube assembly; the inner tube assembly and the outer tube assembly are connected to the reducer assembly to form a complete set of drilling tools, and the installation order of the reducer assembly is as follows: the hole expansion washer is sleeved on the outer ring of the reducer of the drill rod of the drilling tool and then the reducer is connected; finally, the assembled drilling tool is connected to the active drill rod and then vertically hoisted, and the inner tube and the core clamping protection mechanism are observed from below the drill bit. The contact condition of the protection mechanism is that before drilling, the lower end of the inner tube is in the core clamping protection mechanism, and the distance from the telescopic retaining spring is 1.5-2cm. Otherwise, the clearance of the inner tube assembly is corrected by adjusting the spring-cage adjusting screw, and then drilling is started; before lifting the drill, a slight pier drill is performed, that is, the drill tool is raised by 10cm and then quickly lowered to the bottom of the hole, so that the inner tube assembly pushes the telescopic retaining spring of the core clamping protection mechanism to the lower end of the retaining spring seat to restore it to the original curvature. The designed telescopic retaining spring has better strength and curvature than ordinary grabbing springs, which can meet the purpose of retaining spring retaining to clamp the core. The inner tube and the outer tube are standard geological pipes of the same series, and the length can be adjusted according to actual needs. The utility model is used in combination with conventional drill rods and drill bits, and is suitable for formations with plasticity and fluidity characteristics in salt lake drilling. The local reverse circulation mechanism designed in this set of drilling tools can avoid the problem that the core cannot enter the inner tube due to air blockage. At the same time, negative pressure is generated in the inner tube during the drilling process to avoid the core falling and the clogging of the exhaust hole, thereby improving the core recovery rate. The designed spring-clip single-action mechanism improves the timeliness of the single-action mechanism and avoids the problem of inner tube disengagement compared with traditional single-action double-tube drilling tools. The designed core clamping protection mechanism can not only meet the purpose of destroying the original state of the core during drilling, but also prevent the core from falling off during the drilling process.
[0014] Therefore, the utility model has the following advantages:
[0015] 1) The local reverse circulation mechanism designed in the utility model can avoid the problem that the core cannot enter the inner tube due to air blockage. At the same time, negative pressure is generated in the inner tube during the drilling process, which avoids the problem of core falling and exhaust hole blockage, thereby improving the core recovery rate;
[0016] 2) Compared with the traditional single-action double-tube drilling tools, the spring-clip single-action mechanism designed in the utility model improves the timeliness of the single-action mechanism and avoids the problem of inner tube disengagement;
[0017] 3) The core clamping protection mechanism designed in the utility model can not only meet the purpose of destroying the original state of the core during the drilling process, but also meet the purpose of preventing the core from falling off during the drilling process. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of the utility model;
[0019] Figure 2 It is a structural schematic diagram of the reducer of the utility model;
[0020] Figure 3 It is a structural schematic diagram of the hole-expanding gasket of the utility model;
[0021] Figure 4 It is a structural schematic diagram of a drill rod reducer for a drilling tool of the utility model;
[0022] Figure 5 It is a structural schematic diagram of the spring card cavity of the utility model;
[0023] Figure 6 It is a structural schematic diagram of the upper support platform of the spring card cavity of the utility model;
[0024] Figure 7 It is a structural schematic diagram of the spring card adapter of the utility model;
[0025] Figure 8 It is a structural schematic diagram of the lower support platform of the spring-cage cavity of the utility model;
[0026] Fig. 9 It is a structural schematic diagram of a single-acting cavity transmission shaft of the utility model;
[0027] Fig.10 It is a structural schematic diagram of the local reverse circulation mechanism of the utility model;
[0028] Fig.11 It is a structural schematic diagram of the core clamping protection mechanism of the utility model.
[0029] The following are the descriptions of the reference numerals:
[0030] 1. Spring-clip adjusting screw; 2. Reducer adapter; 3. Hole expansion washer; 4. Reducer adapter for drilling tool and drill pipe; 5. Spring-clip adjusting nut; 6. Upper support platform of spring-clip chamber; 7. Spring-clip chamber; 8. Spring-clip adapter; 9. Spring; 10. Pressure bearing of spring-clip chamber; 11. Lower support platform of spring-clip chamber; 12. Rolling bearing; 13. Upper pressure bearing of single-action chamber; 14. Single-action chamber; 15. Transmission shaft of single-action chamber; 16. Lower support platform of single-action chamber; 17. Lower pressure bearing of single-action chamber; 18. Locking nut; 19. Inner tube adapter; 20. Through screw; 21. Filter locking mechanism; 22. Inner tube; 23. Core clamping protection mechanism; 24. Circlip seat; 25. Inner step of drill bit; 26. Outer tube; 27. Telescopic circlip;
[0031] 15.1, locking pin position; 15.2, single-action chamber upper pressure bearing and rolling bearing sleeve position; 15.3, upper step load-bearing position; 15.4, lower step load-bearing fixed position; 15.5, single-action chamber lower pressure bearing sleeve fixed position; 15.6, local reverse circulation inner pipe connection position; 15.7, channel; 15.8, steel ball;
[0032] 21.1. Filter cup cover; 21.2. Filter cup body;
[0033] 24.1, guide groove; 24.2, steel ring;
[0034] 27.1. Steel ring; 27.2. Reed clip. DETAILED DESCRIPTION
[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0036] See also Figures 1 to 11The mechanism of the specific embodiment of the utility model includes a reducer assembly, a spring card single-action mechanism, a local reverse circulation mechanism, a core clamping protection mechanism and an outer tube 26. The reducer assembly, the spring card single-action mechanism and the local reverse circulation mechanism are arranged in the outer tube from top to bottom. The reducer assembly includes a reducer 2, a hole expansion washer 3 and a drill rod reducer 4. The reducer 2 is a hollow structure inside, and the inner side of the upper end is a positive thread female buckle. The outer diameter of the upper end is consistent with the outer diameter of the outer tube 26. The reducer 2 The outer diameter of the middle position is smaller than the inner diameter of the reaming gasket 3, and the length is consistent with the height of the reaming gasket 3. The outer side of the lower end is a positive thread male buckle, and the buckle type is consistent with the female buckle on the upper end of the drill pipe reducer 4 of the drilling tool; the inside of the reaming gasket 3 is a hollow structure, which is arranged around the middle position of the reducer 2, and the outer diameter is consistent with the outer diameter of the outer tube 26. The reaming gasket 3 is vertically evenly arranged with 4 alloy blocks, which are inserted into the middle position of the drill pipe reducer 4 of the drilling tool for the purpose of reaming and straightening. The reaming gasket 3 is located on the outer side of the upper end of the outer tube 26. The drill pipe reducer 4 of the drilling tool is a hollow structure, and a positive thread female buckle is provided on the inner side of the upper end to connect to the lower end of the reducer 2, and the outer diameter of the upper end is consistent with the outer diameter of the outer tube 26. The outer side of the lower end is a positive thread male buckle, which is connected to the spring card single-action mechanism.
[0037] The spring-cage single-action mechanism includes a spring-cage adjusting screw 1, a spring-cage adjusting nut 5, an upper support platform 6 of the spring-cage cavity, a spring-cage cavity 7, a spring-cage takeover 8, a spring 9, a spring-cage cavity pressure bearing 10, a spring-cage cavity lower support platform 11, a rolling bearing 12, a single-action cavity upper pressure bearing 13, a single-action cavity 14, a single-action cavity transmission shaft 15, a single-action cavity lower support platform 16 and a single-action cavity lower pressure bearing 17. The upper part of the spring-cage adjusting screw 1 passes through the reducer takeover assembly, and the lower end is connected to the spring-cage takeover 8. The buckle type of the spring-cage adjusting nut 5 is consistent with that of the spring-cage adjusting screw 1 and is installed on the spring-cage adjusting screw 1; the spring-cage cavity 7 is a hollow structure, and the inner sides of the upper and lower ends are both positive thread female buckles. The upper positive thread female buckle is connected to the lower male buckle of the drill rod reducer 4, and the lower positive thread female buckle is connected to the spring-cage cavity lower support platform 11. The inner diameter is larger than the outer diameter of the spring 9; the inner diameter of the drill rod reducer 4 is larger than the outer diameter of the upper end of the spring card receiver 8; the lower support 11 of the spring card cavity is an inverted T-shaped structure with a hollow structure inside. The outer side of the upper end is a positive thread male buckle, which is connected to the positive thread female buckle at the lower end of the spring card cavity 7. The outer diameter of the lower end is consistent with the outer diameter of the spring card cavity 7. The inner diameter of the lower support 11 of the spring card cavity is larger than the outer diameter of the upper connecting shaft of the spring card receiver 8 and smaller than the inner diameter of the spring 9 and the pressure bearing 10 of the spring card cavity. The pressure bearing 10 of the spring card cavity is arranged at the upper end of the lower support 11 of the spring card cavity, and is located in the spring card cavity 7; the spring card receiver 8 is installed at the lower end of the lower support 11 of the spring card cavity, and is divided into three parts: upper, middle and lower. The upper part is a connecting shaft, which runs through the spring card cavity 7, and its outer diameter is smaller than the inner diameter of the spring 9. A positive thread female buckle is provided at the upper end and connected to the spring card adjusting screw 1 , the spring 9 is arranged around the outside of the connecting shaft, the outer diameter of the middle part is consistent with the outer diameter of the lower support platform 11 of the spring card cavity, and the inner side of the lower end is a positive thread male buckle, which is connected to the upper end of the single-action cavity 14; the upper support platform 6 of the spring card cavity is a T-shaped structure, and the interior is a hollow structure, the inner diameter is larger than the outer diameter of the spring card adjusting screw 1, the outer outer diameter of the upper end is smaller than the inner diameter of the spring card cavity 7, and the outer outer diameter of the lower end is smaller than the inner diameter of the spring 9; the spring 9 is stuck between the upper support platform 6 of the spring card cavity and the lower support platform 11 of the spring card cavity, the spring card adjusting screw 1 passes through the upper support platform 6 of the spring card cavity, and the outer thread of the lower end is connected with the positive thread female buckle on the inner side of the upper end of the connecting shaft; the interior of the single-action cavity 14 is a hollow structure with an outer diameter smaller than the outer diameter of the spring card cavity 7, and both the upper and lower ends are positive thread female buckles. The single-action cavity 14 is provided with two inner steps from top to bottom, and the inner diameters and heights of the two inner steps are respectively Corresponding to the two outer steps of the single-acting cavity transmission shaft 15, in order to achieve the purpose of straightening and preventing the single-acting cavity transmission shaft 15 from moving up and down, an oil injection nozzle or oil injection window is provided below the upper thread of the single-acting cavity 14; the single-acting cavity transmission shaft 15 is divided into six parts from top to bottom: a locking pin part 15.1 (this part is provided with a positive thread male buckle and a horizontal through hole is dug for installing a locking nut and connecting and fixing the lower end of the spring card adapter), a single-acting cavity upper pressure bearing and rolling bearing sleeve part 15.2 (the outer diameter of this part is equal to the inner diameter of the single-acting cavity upper pressure bearing 13 and rolling bearing 12, the rolling bearing 12 is sleeved into the upper end of the single-acting cavity upper pressure bearing and rolling bearing sleeve part, and the single-acting cavity upper pressure bearing 13 is sleeved into the lower end of the single-acting cavity upper pressure bearing and rolling bearing sleeve part), and an upper step load-bearing part 15.3. Lower step load-bearing fixed position 15.4 (upper step load-bearing position 15.3, lower step load-bearing fixed position 15.4 correspond to the positions of the two inner steps in the single-moving chamber 14), single-moving chamber lower pressure bearing sleeve fixed position 15.5 (the outer diameter of this position is equal to the inner diameter of the single-moving chamber lower pressure bearing 17, and the single-moving chamber lower pressure bearing sleeve fixed position 15.5), local reverse circulation inner pipe connection position 15.6 (this position is for connecting the inner pipe connection The key part of the hand 19 and the local reverse circulation mechanism is provided with a positive thread male buckle on the outside, a hole 15.7 is vertically provided at the center of the inside, and a steel ball 15.8 is provided in the hole 15.7. An exhaust hole connected to the hole 15.7 is horizontally provided at the upper end of the local reverse circulation inner tube connection part, and the exhaust hole diameter is smaller than the steel ball diameter); the single-action cavity lower support 16 is an inverted T-shaped structure with a hollow structure inside, passing through the lower end of the single-action cavity transmission shaft 15, and the positive thread male buckle at the upper end is connected to the lower end of the single-action cavity 14.
[0038] The local reverse circulation mechanism includes a locking nut 18, an inner tube adapter 19, a filter locking mechanism 21 and an inner tube 22; the locking nut 18 is composed of a nut and a stop washer, and is installed on the positive thread male buckle on the outer side of the lower end of the single-acting cavity transmission shaft 15, and is used to adjust the gap of the inner tube 22; the inner tube adapter 19 is a T-shaped structure, with a hollow structure inside, and a positive thread female buckle is provided on the inside, which is connected to the positive thread male buckle on the outer side of the lower end of the single-acting cavity transmission shaft 15, located below the locking nut 18, and a positive thread male buckle is provided on the outer side of the lower end of the inner tube adapter 19, which is used to connect the inner tube 22; The filter locking mechanism 21 includes a through screw 20, a filter cup cover 21.1, a filter cup body 21.2 and a filter, which mainly filters gravel to prevent gravel from clogging the exhaust hole; the through screw 20 is hollow inside, the inner diameter is smaller than the diameter of the steel ball, and the outer side is all positive thread male buckles, the buckle type is consistent with the inner female buckle of the lower end of the single-action cavity transmission shaft 15, and is connected to the lower end of the single-action cavity transmission shaft 15; the outer diameter of the filter cup body 21.2 is smaller than the inner diameter of the inner tube 22, the interior is hollowed out, and the outer side is provided with a positive thread female buckle, the depth is The filter cup cover 21.1 is half the thickness of the filter cup body 21.2. The bottom of the filter cup body 21.2 is flat and has a concentric water hole. The diameter of the water hole is half the inner diameter of the filter cup body 21.2. The outer diameter of the filter cup cover 21.1 is consistent with the inner diameter of the filter cup body 21.2. The inner side of the filter cup cover 21.1 is all positive thread male buckles (the buckle type is consistent with the positive thread female buckle on the outer side of the cup body). The filter cup body 21.2 is set in the filter cup cover 21.1 and is connected to the filter cup cover 21.1 threaded. The center of the filter cup cover 21.1 A concentric water hole is provided axially, and the inner diameter of the water hole is consistent with the outer diameter of the through screw 20. A positive thread female buckle is provided on the inner side of the water hole to connect with the positive thread male buckle on the outer side of the through screw 20. The fineness of the filter screen is determined according to the sand content of the water in the borehole and the solid content of the mud. Generally, 160 mesh or 200 mesh is selected. The diameter of the filter screen is consistent with the inner diameter of the filter cup body 21.2 and is installed between the filter cup body 21.2 and the filter cup cover 21.1. The inner tube 22 adopts a conventional inner tube, the upper end of which is connected to the inner tube handle 16, and the lower end is connected to the core clamping protection mechanism.
[0039] The core clamping protection mechanism includes a clamping spring seat 24 and a telescopic clamping spring 27. When coring (single-tube pier drilling, that is, the main winch brake is released after the drill tool is pulled up 10 cm from the bottom of the hole to make the drill tool fall freely), the spring mechanism and the lower structure are elastically pushed down as a whole, pushing the telescopic clamping spring 27 to move down to clamp the core, and the clamping spring piece shrinks like a grab to prevent the core from falling off;
[0040] The spring seat 24 is cylindrical, and can be made of steel pipe. Its outer diameter is slightly smaller than the inner diameter of the drill bit rigid body, and its height is about 12 cm. Its structure is lantern-shaped, and it is divided into three parts from top to bottom, that is, the upper part is about 3 cm high, and the inner diameter is slightly larger than the outer diameter of the inner tube 22. When drilling normally, the lower end of the inner tube 22 is located in the upper part of the spring seat 24; the inner diameter of the middle part is slightly larger than the outer diameter of the inner tube 22, the height is about 5 cm, and it is evenly distributed vertically along the steel pipe wall, and the guide grooves 24.1 are opened downward (with a width of about 1 cm and the inner and outer walls are open). The number and layout of the guide grooves 24.1 are consistent with the spring sheet 27.2; the inner diameter of the lower part is consistent with the inner diameter of the inner tube 22, and a steel ring 24.2 is arranged inside the lower end guide (the lower end of the guide groove 24.1); the telescopic spring 27 includes a steel ring 27. 1 and a spring plate 27.2, the inner diameter of the steel ring 27.1 is larger than the inner diameter of the inner tube 22, the outer diameter is smaller than the inner diameter of the upper part of the spring seat 24, and the height is about 1cm; a groove is provided on the outer wall of the steel ring 27.1 (the depth is consistent with the thickness of the spring plate 27.2, the opening position is consistent with the position of the guide groove 24.1, the width is 8mm, the upper end of the spring plate 27.2 is embedded in the groove of the steel ring 27.1, the spring plate is selected with an arc, a through hole is provided in the middle of the groove, the upper end of the spring plate 27.2 is embedded in the groove of the steel ring 27.1, and is connected with the groove through the steel ring rivet and the through hole, the length is greater than 7cm, the thickness is 0.7mm, and the width is 8mm. The spring plate 27.2 can slide up and down along the guide groove 24.1, and the lower end extends outside the steel ring 24.2.
[0041] When installing the utility model, first install the single-acting mechanism, install the rolling bearing 12 on the single-acting cavity transmission shaft 15 from top to bottom, install the single-acting cavity transmission shaft 15 with the rolling bearing 12 installed into the single-acting cavity 14 from top to bottom, install the single-acting cavity upper pressure bearing 13 into the single-acting cavity 14 from bottom to top, lock the pressure bearing top screw after the single-acting cavity upper pressure bearing 13 is in place, penetrate the single-acting cavity lower pressure bearing 17 from bottom to top to the lower step load-bearing fixed position 15.4 of the single-acting cavity transmission shaft 15, connect the single-acting cavity lower support platform 16 to the lower end of the single-acting cavity 14, and lock the upper end of the single-acting cavity transmission shaft 15 with a locking nut. At this time, the single-acting mechanism has been installed (pay attention to observe whether the exhaust hole of the single-acting cavity transmission shaft 15 below the single-acting cavity lower support platform 16 is exposed. If exposed, the installation is normal, otherwise adjust it).
[0042] Secondly, install the local reverse circulation mechanism at the lower end of the single-acting chamber 14, rotate the locking nut 18 to the hollow top below the single-acting chamber transmission shaft 15, install and screw the inner tube adapter 19 to the lower end of the locking nut 18, install the through-core screw 20 to the lowest part of the single-acting chamber transmission shaft 15, put the filter into the filter cup body 21.2, tighten the filter cup cover 21.1 onto the filter cup body 21.2 to lock the filter, install the through-core screw 20 on the upper end of the filter cup cover 21.1, connect the inner tube 22 to the inner tube adapter 19, and the local reverse circulation mechanism is installed.
[0043] Then install the spring-cage mechanism at the upper end of the single-action mechanism, connect the male buckle at the lower end of the spring-cage receiver 8 to the female buckle at the upper end of the single-action chamber 14, insert the lower support platform 11 of the spring-cage chamber into the column of the spring-cage receiver 8, and thread the spring-cage chamber 7 to the lower support platform 11 of the spring-cage chamber. Then, install the spring-cage chamber pressure bearing 10 and the spring 9 into the spring-cage chamber 7 respectively, buckle the upper support platform 6 of the spring-cage chamber into the spring-cage chamber 7, press the upper support platform 6 of the spring-cage chamber to expose the top of the spring-cage receiver 8 to the top of the upper support platform 6 of the spring-cage chamber, install the spring-cage adjusting screw 1 to the top of the spring-cage receiver 8 (the thread should be tightened), install the spring-cage adjusting nut 5 to the spring-cage adjusting screw 1, and push it to the top of the upper support platform 6 of the spring-cage chamber, and then the spring-cage mechanism is installed;
[0044] After the drill pipe reducer 4 is passed through the spring-cage adjusting screw 1 and connected to the upper end of the spring-cage cavity 7, the reducer 2 is passed through the reaming gasket 3 and the spring-cage adjusting screw 1 and connected to the upper end of the drill pipe reducer 4, the reducer assembly is installed, and the inner tube assembly is installed as a whole;
[0045] The next step is to install the core clamping mechanism. After fixing the core clamping mechanism 24 to the inner step 25 of the drill bit, the outer tube 26 is connected, the outer tube 26 is inserted into the inner tube assembly, and the upper end of the outer tube 26 is connected to the outer diameter male buckle of the drill pipe reducer 4 of the drill tool. The installation of the local reverse circulation single-action double-tube drilling tool is completed.
[0046] During normal drilling, the inner tube 22 is in the core clamping protection mechanism 23 and needs to be about 1.5-2 cm away from the upper end of the retaining spring (the spacing is adjusted by the locking nut 18 and the spring-adjusting nut 5); when lifting the drill, a slight piercing is performed, that is, the drill tool is raised by 10 cm and then quickly lowered to the bottom of the hole, and the retaining spring moves downward along the guide groove at the lower end of the core clamping protection mechanism 23, further reducing the inner diameter of the bottom of the drill bit, thereby playing the role of clamping and preventing the core from falling off.
[0047] The use process of the utility model is as follows:
[0048] First, the ejection single-action mechanism, the local reverse circulation mechanism and the inner tube 22 are sequentially connected to form an inner tube assembly;
[0049] Secondly, after the core clamping protection mechanism is installed into the upper end of the inner step of the drill bit, the outer tube 26 and the drill bit are connected to form an outer tube assembly;
[0050] Then the inner tube assembly and the outer tube assembly are connected to the drill pipe reducer to form a complete set of drilling tools. The installation order of the reducer assembly is as follows: the expansion gasket 3 is put on the outer ring of the drill pipe reducer 4 and then connected to the reducer 2;
[0051] Finally, the assembled drilling tool is connected to the active drill pipe and lifted vertically. The contact between the inner tube 22 and the core clamping protection mechanism 23 is observed from below the drill bit. Before drilling, the lower end of the inner tube 22 is in the core clamping protection mechanism 23, and the distance from the telescopic clamp spring is 1.5-2cm. Otherwise, the inner tube assembly gap is corrected by adjusting the spring clamp adjusting screw 1 (the spacing is adjusted by the locking nut 18 and the spring clamp adjusting nut 5). After correction, it can be used for drilling;
[0052] Before lifting the drill, perform slight pier drilling, that is, pull the drill bit up 10 cm and then quickly lower it to the bottom of the hole, so that the inner tube assembly pushes the telescopic retaining spring of the core clamping protection mechanism 23 to the lower end of the retaining spring seat 24 to restore it to the original curvature. The designed telescopic retaining spring has better strength and curvature than ordinary grabbing springs, which can meet the purpose of retaining spring clamping the core.
[0053] During normal drilling, the core enters the inner tube 22 from bottom to top, and the gas in the inner tube 22 is discharged to the middle channel 15.7 of the local reverse circulation inner tube connection part 15.6 along the hollow hole of the filter cup body 21.2, the filter cup cover 21.1, and the through screw 20. As the internal pressure of the inner tube 22 increases, the steel ball 15.8 is pushed to the top of the channel 15.7 by the air pressure, and the gas is discharged to the outside of the inner tube assembly along the horizontal exhaust hole at the upper end of the local reverse circulation inner tube connection part 15.6, so as to avoid the core being not drilled due to air blockage. The problem of the core entering the inner tube 22; when the drill is lifted, the core stops entering the inner tube 22. At this time, the steel ball 15.8 is affected by gravity and falls to the top of the through-hole 15.7 along the middle screw 20. When the drill is lifted, the steel ball 15.8 blocks the upper end of the exhaust hole of the through-hole 20, and the air cannot be sucked into the inner tube 22. There is a negative pressure area at the top of the inner tube 22, which avoids the problem of the core falling. At the same time, a filter is set in the filter locking mechanism 21. During the drilling process, the problem of blockage of the channel 15.7 caused by sand and gravel entering the exhaust hole is avoided.
[0054] The technical contents not specifically described in the present utility model and the above embodiments are the same as the prior art.
[0055] The above are only specific implementation methods disclosed in the present utility model, but the protection scope of the present utility model is not limited thereto. The protection scope of the present utility model shall be based on the protection scope of the claims.
Claims
1. A local reverse circulation single-action double-tube drilling tool for salt lake drilling, characterized in that: The local reverse circulation single-action double-tube drilling tool for salt lake drilling includes a reducer assembly, a spring-clip single-action mechanism, a local reverse circulation mechanism, a core clamping protection mechanism and an outer tube component mechanism. The reducer assembly, the spring-clip single-action mechanism and the local reverse circulation mechanism are arranged in the outer tube from top to bottom in sequence. The reducer assembly includes a reducer, a hole expansion washer and a drill pipe reducer. The reducer is a hollow structure inside, and the hole expansion washer is a hollow structure inside, which is arranged around the middle position of the reducer. The drill pipe reducer is a hollow structure. The upper end of the drill pipe reducer is connected to the lower end of the reducer, and the lower end is connected to the spring-clip single-action mechanism. The hole expansion washer is located outside the upper end of the outer tube, and the core clamping protection mechanism is connected to the lower end of the outer tube.
2. The local reverse circulation single-action double-tube drilling tool for salt lake drilling according to claim 1 is characterized in that: The ejection card single-action mechanism includes an ejection card adjustment screw, an ejection card adjustment nut, an ejection card chamber upper platform, an ejection card chamber, an ejection card takeover, a spring, an ejection card chamber pressure bearing, an ejection card chamber lower platform, a rolling bearing, a single-action chamber upper pressure bearing, a single-action chamber, a single-action chamber transmission shaft, a single-action chamber lower platform and a single-action chamber lower pressure bearing. The upper part of the ejection card adjustment screw passes through the reducer takeover assembly, and the lower end is connected to the ejection card takeover. The ejection card adjustment nut is arranged on the ejection card adjustment screw; the ejection card chamber is a hollow structure, the upper end of which is connected to the lower end of the drill rod reducer, and the lower end is connected to the ejection card chamber lower platform; the ejection card chamber lower platform is an inverted T-shaped structure with a hollow structure inside, the upper end of which is connected to the lower end of the ejection card chamber, and the ejection card chamber pressure The bearing is arranged at the upper end of the lower support platform of the ejection card cavity and is located in the ejection card cavity; the ejection card receiver is arranged at the lower end of the lower support platform of the ejection card cavity and is divided into three parts: upper, middle and lower. The upper part is a connecting shaft, and the connecting shaft passes through the ejection card cavity. The upper end of the connecting shaft is connected to the ejection card adjusting screw. The lower support platform of the ejection card cavity is sleeved in the middle of the ejection card receiver. The lower end of the lower part of the ejection card receiver is connected to the upper end of the single-action cavity, and the spring is arranged around the outer side of the connecting shaft; the upper support platform of the ejection card cavity is a T-shaped structure with a hollow structure inside. The ejection card adjusting screw passes through the upper support platform of the ejection card cavity, and the lower end is connected to the upper end of the connecting shaft; the interior of the single-action cavity is a hollow structure, and the uppermost end of the single-action cavity is connected to the lowermost end of the ejection card receiver; the middle part of the single-action cavity There are two inner steps from top to bottom, the single-acting chamber transmission shaft passes through the single-acting chamber, and the single-acting chamber transmission shaft is divided into six parts from top to bottom: a locking latch part, a single-acting chamber upper pressure bearing and a rolling bearing insertion part, an upper step load-bearing part, a lower step load-bearing fixed part, a single-acting chamber lower pressure bearing insertion fixed part and a local reverse circulation inner tube connection part. The locking latch part is located at the top of the single-acting chamber transmission shaft, and threads and latch holes are provided on the outside of the locking latch part. The rolling bearing is inserted into the upper end of the single-acting chamber upper pressure bearing and the rolling bearing insertion part, and the single-acting chamber upper pressure bearing is inserted into the lower end of the single-acting chamber upper pressure bearing and the rolling bearing insertion part. The locking latch part is inserted into After fixing the nut, it is used to fix the pressure bearing and rolling bearing on the single-acting chamber to loosen upward; the upper step load-bearing part and the lower step load-bearing fixed part correspond to the positions of the two inner steps in the single-acting chamber, the single-acting chamber lower pressure bearing is sleeved into the single-acting chamber lower pressure bearing sleeve fixed part, a channel is vertically arranged at the inner center of the local reverse circulation inner tube connection part, and a steel ball is arranged in the channel, an exhaust hole connected to the channel is horizontally arranged at the upper end of the local reverse circulation inner tube connection part, and the diameter of the exhaust hole is smaller than the diameter of the steel ball, the single-acting chamber lower support platform is an inverted T-shaped structure with a hollow structure inside, the single-acting chamber transmission shaft passes through the single-acting chamber lower support platform, and the upper end of the single-acting chamber lower support platform is connected to the lower end of the single-acting chamber.
3. The local reverse circulation single-action double-tube drilling tool for salt lake drilling according to claim 2 is characterized in that: The local reverse circulation mechanism comprises a locking nut, an inner tube handle, a filter locking mechanism and an inner tube; the locking nut is arranged at the lower end of the single-acting chamber transmission shaft; the inner tube handle is a T-shaped structure with a hollow structure inside, located below the locking nut, and connected to the lower end of the single-acting chamber transmission shaft, the reverse circulation mechanism is arranged in the inner tube, the filter locking mechanism comprises a through screw, a filter cup and a filter; the through screw is a hollow structure with an inner diameter smaller than the diameter of the steel ball, and is connected to the lower end of the single-acting chamber transmission shaft; the filter cup comprises a cup body and a cup cover, the cup cover is arranged on the cup body, the filter is arranged between the cup body and the cup cover, concentric water holes are left in the center of the cup cover and the center of the bottom of the cup body, the upper part of the through screw is connected to the water hole of the cup cover, and the lower part passes through the water hole of the cup body, the upper end of the inner tube is connected to the lower end of the inner tube handle, and the lower end is connected to the core clamping protection mechanism.
4. The local reverse circulation single-action double-tube drilling tool for salt lake drilling according to claim 3 is characterized in that: The core clamping protection mechanism includes a retaining spring seat and a telescopic retaining spring. The retaining spring seat is cylindrical, and a guide groove passes vertically downward through the lower part of the side wall. There are multiple guide grooves, which are arranged around the retaining spring seat. A steel ring is arranged horizontally around the inner side of the lower end of the guide groove. The telescopic retaining spring includes a steel ring and a retaining spring sheet. The retaining spring sheet is arranged on the steel ring. There are multiple retaining spring sheets corresponding to the guide groove, which are arranged around the steel ring. The steel ring is arranged in the retaining spring seat and can slide up and down along the retaining spring seat. The retaining spring sheet is a spring sheet with an arc, which can slide up and down along the guide groove, and the lower end extends outside the steel ring.
5. The local reverse circulation single-action double-tube drilling tool for salt lake drilling according to claim 4, characterized in that: A plurality of slots are arranged around the outer wall of the steel ring, and the arrangement position is consistent with the guide slot position. A through hole is arranged in the middle of the slot. The upper end of the spring sheet is embedded in the steel ring slot and connected to the steel ring through the steel ring rivet and the through hole.
6. The local reverse circulation single-action double-tube drilling tool for salt lake drilling according to claim 5, characterized in that: The hole-expanding washer is provided with 4 alloy blocks evenly distributed vertically and is inserted into the middle position of the reducing adapter.
7. The local reverse circulation single-action double-tube drilling tool for salt lake drilling according to claim 6, characterized in that: The mesh number of the filter is 160 meshes or 200 meshes.
8. The local reverse circulation single-action double-tube drilling tool for salt lake drilling according to claim 7, characterized in that: An oil injection nozzle or an oil injection window is arranged at the upper end of the single-action chamber.