A dual-power head mounting structure, drilling rig, and control method

Abstract

This invention provides a dual-power head installation structure, drilling rig, and control method. The installation structure includes: a mast assembly comprising two outer masts and an inner mast slidably disposed between the two outer masts; two track plates, detachably connected to the front of the corresponding outer masts; an outer lifting cylinder for driving the upper and lower movement of the outer power head; an outer power head slidably connected to the track plates via a sliding frame; the telescopic ends of the outer lifting cylinders pass through the corresponding sliding frames from top to bottom, with their cylinders connected to the end face of the sliding frames near the mast operating platform, and their telescopic ends connected to the mast operating platform via supports; two inner lifting cylinders, respectively disposed within the corresponding outer masts, with their two telescopic ends connected to the top of the inner mast via mast connectors; and an inner power head slidably disposed on the front of the inner mast; the outer power head and the inner power head are coaxially arranged vertically. The dual power heads of this invention can share the same wellhead and can achieve dual-power head drilling with casing.

Description

Technical Field

[0001] This invention relates to the field of drilling rig technology, and in particular to a dual-power head mounting structure, a drilling rig, and a control method. Background Technology

[0002] Based on current market demand, and to meet the drilling and exploration needs of extremely complex formations, it is considered to add an external power head (for drilling rigs that can only be equipped with a single power head, i.e., an internal power head) to conventional drilling rigs. This external power head can be used for deep holes with a diameter of 450mm or more. During normal operations, the internal power head can perform conventional drilling operations such as coalbed methane, geothermal, water well, and oil exploration and development. When encountering extremely complex formations such as aquifers, goafs, collapse zones, karst caves, or loose formations, a large-diameter external power head can be used for dual-power head drilling with casing, thus meeting the requirements for rapid drilling in complex formations. However, since the external power head is not essential and is only used under special circumstances, the following issues need to be addressed when adding an external power head:

[0003] 1. Since the internal and external power heads need to share the same wellhead, how to set up the external power head to share the same wellhead with the internal power head, while also sharing the main power source with the internal power head, so as to avoid excessively increasing the equipment cost;

[0004] 2. While ensuring a compact overall structure, the machine must also support dual-power head drilling with casing.

[0005] 3. To meet the national road transport regulations regarding the weight and height of the entire machine, how can the external power head be quickly disassembled and installed, while also achieving its lifting function?

[0006] Therefore, there is an urgent need for a dual-power head installation structure, drilling rig, and control method that can share the same wellhead and main power source without increasing the overall transport weight and width of the machine, and can achieve dual-power head drilling with casing. Summary of the Invention

[0007] The purpose of this invention is to provide a dual-power head installation structure, drilling rig, and control method, aiming to solve the technical problem of how to install dual-power heads without significantly increasing equipment costs and complexity.

[0008] To achieve the above objectives, in a first aspect, the present invention provides a dual-power head mounting structure, comprising:

[0009] A mast assembly comprising two outer masts spaced apart and an inner mast slidably disposed between the two outer masts;

[0010] Two track plates are detachably connected to the front of the corresponding outer mast;

[0011] Two external lifting cylinders are used to drive the external power head to move up and down;

[0012] An external power head is slidably connected to the track plate via a sliding frame, used to connect the casing and to achieve rock-breaking drilling under the action of the external lifting cylinder;

[0013] The telescopic ends of the external lifting cylinders pass through the corresponding sliding frames from top to bottom. The cylinder barrels are connected to the end face of the sliding frame near the mast operating platform, and the telescopic ends are connected to the mast operating platform through supports.

[0014] Two internal lifting cylinders are respectively installed inside the corresponding outer mast, and their two telescopic ends are connected to the top of the inner mast through mast connectors;

[0015] The internal power head is slidably mounted on the front of the inner mast, used to connect the drill pipe and to lift or press down under the action of the internal lifting cylinder to achieve drilling or tripping; and the external power head and the internal power head are coaxially arranged.

[0016] As a further improvement to the above solution, the dual-power head mounting structure also includes an inner power head follower structure. The inner power head follower structure includes a wire rope, a pulley block set on the mast connector, and a wire rope fixing seat set on the back of the outer mast. One end of the wire rope is connected to the top of the inner power head, and the other end passes around the pulley block and is connected to the wire rope fixing seat.

[0017] As a further improvement to the above solution, the dual-power head mounting structure also includes a hydraulic control system. The hydraulic control system includes a main engine and an auxiliary engine connected in parallel. The main engine and the auxiliary engine can provide hydraulic power for the lifting and lowering of the inner power head, the rotation of the inner power head, and the rotation and lifting of the outer power head, respectively.

[0018] As a further improvement to the above solution, the internal power head includes an internal power head body and a track pulley disposed on the back of the internal power head body;

[0019] Correspondingly, inner slide rails matching the track pulleys are provided on both sides of the front of the inner mast, and the track pulleys are correspondingly matched and locked on the slide rails to achieve a slidable connection.

[0020] As a further improvement to the above solution, guide rollers are provided on both sides of the inner mast, and correspondingly, outer slide rails are provided on the corresponding sides of the two outer masts. The guide rollers are matched and locked on the outer slide rails to achieve a slidable connection.

[0021] As a further improvement to the above solution, the external power head includes an external power head body and a connecting plate disposed on one side of the external power head body;

[0022] The external power head is connected to the sliding frame via the connecting plate.

[0023] As a further improvement to the above solution, the sliding frame includes a support frame, two track clips and two clip connectors. The track clips are disposed on both sides of the support frame through the clip connectors, and the two track clips are symmetrically arranged about the center of the support frame, so that the sliding frame can be slidably fitted onto the track plate.

[0024] As a further improvement to the above solution, the cross-section of the track clamp is L-shaped.

[0025] As a further improvement to the above solution, the support frame includes a base plate, two side plates vertically arranged on the base plate, and a cover plate;

[0026] The two side plates are arranged parallel to each other on the base plate, and the cover plate is placed on the upper end of the two side plates, forming a mounting through hole for the external lifting cylinder to pass through;

[0027] It also includes a cylinder mounting plate, which is installed at one end of the mounting through hole for fixed installation with the cylinder of the external lifting cylinder.

[0028] As a further improvement to the above solution, the cover plate is provided with several power head mounting holes, and the connecting plate of the power head is fastened to the cover plate by bolts.

[0029] As a further improvement to the above solution, a wear-resistant plate is also provided between the sliding frame and the track plate.

[0030] As a further improvement to the above solution, a number of connecting blocks are spaced apart on the front of the outer mast, and the track plate is detachably connected to the connecting blocks;

[0031] Specifically, the connecting block is a nut plate, including a plate body and a threaded hole provided on the plate body; correspondingly, the track plate is provided with a number of countersunk holes that match and connect with the threaded holes.

[0032] In a second aspect, the present invention also provides a drilling rig, including a drilling rig body and a dual power head mounting structure as described in the first aspect, disposed on the drilling rig body.

[0033] Thirdly, the present invention also provides a drilling rig control method as provided in the second aspect, the steps of which include:

[0034] S1. When dual-power-head casing drilling is required, the casing is connected to the outer power head, and the drill rod is connected to the inner power head, with the drill rod passing through the casing from top to bottom:

[0035] S11. When encountering loose and extremely complex formations, adjust the drilling speed of the inner power head and the outer power head so that the drill bit of the drill rod is located inside the casing and its drill bit end face is higher than the casing shoe of the casing. The casing is drilled in front and the drill bit follows, forming a safety cavity between the drill rod and the casing.

[0036] S12. When encountering hard strata, adjust the drilling speed of the inner power head and the outer power head so that the drill bit of the drill rod extends out of the casing and its drill bit end face is lower than the casing shoe of the casing. The drill bit breaks the rock in front and the casing follows the drilling.

[0037] S2. When only a single power head drilling rig is needed, simply connect the drill rod or casing to the corresponding power head and start the corresponding power head to perform drilling operations.

[0038] Because the present invention adopts the above technical solutions, the beneficial effects of this application are as follows:

[0039] 1. This invention provides a dual-power-head mounting structure. It comprises an outer mast and an inner mast, with the inner mast slidably positioned between the two outer masts. The inner power head is slidably mounted on the front of the inner mast, and the outer power head is detachably mounted on the front of the outer mast via the external power head mounting structure. The inner and outer power heads are coaxially arranged from top to bottom, allowing the drill pipe mounted on the inner power head and the casing mounted on the outer power head to be coaxially aligned, thus enabling the inner and outer power heads to share a single wellhead. Furthermore, the coaxial vertical spacing of the inner and outer power heads allows the drill pipe to pass through the casing and work together, achieving dual-power-head drilling with casing while maintaining a compact overall structure. Specifically, when encountering mined-out conditions… In complex geological formations such as rockfall zones, karst caves, and loose strata, mud loss is common, making rapid drilling with conventional drill bits impossible. However, the dual-power head installation structure provided by this invention allows for control of the rotational speeds of the inner and outer power heads. This ensures that the drill bit end face is higher than the casing shoe, allowing the casing to drill first, followed by the drill bit, creating a safety cavity between the drill rod and the casing. This prevents drilling fluid loss during conventional mud drilling, ensuring normal circulation of drilling fluid during normal drilling by the inner power head. When encountering normal rock formations with hard strata, the relative drilling speeds of the inner and outer power heads can be adjusted, allowing the drill rod (controlled by the inner power head) to drill first, resulting in high rock-breaking efficiency, while the casing drilling follows closely behind. This leads to higher overall efficiency for dual-power head drilling with casing.

[0040] Furthermore, in this invention, the external power head is detachably mounted on the front of the outer mast via an external power head mounting structure. Specifically, several connecting blocks are provided on the side of the mast, and the track plate is detachably connected to the connecting blocks; the sliding frame is slidably mounted on the track plate, and the power head is connected to the sliding frame via the connecting plates. With this configuration, during transportation, the power head can be removed from the sliding frame, and the sliding frame can also be removed from the track plate; the track plate can also be removed from the connecting blocks, thereby effectively reducing the overall weight of the equipment. The overall weight and height of the machine meet national road regulations. The telescopic end of the external lifting cylinder passes through the sliding frame from top to bottom, and its cylinder is connected to the end face of the sliding frame near the mast operating platform. The telescopic end is also connected to the mast operating platform via a support. With this configuration, since the rod end of the external lifting cylinder is fixedly connected to the mast operating platform, and its cylinder is connected to the end face of the sliding frame near the mast operating platform, the telescopic movement of the external lifting cylinder can drive the sliding frame to move up and down, thereby driving the power head to move up and down, and thus enabling the power head to slide up and down on the mast wellhead side.

[0041] 2. This invention provides a dual-power head mounting structure, which further includes a hydraulic control system. The hydraulic control system includes a main engine and an auxiliary engine connected in parallel. The main engine and the auxiliary engine can respectively provide hydraulic power for the lifting and lowering of the inner power head, the rotation of the inner power head, and the rotation and lifting of the outer power head. In the hydraulic system, the parallel main engine and auxiliary engine can respectively provide hydraulic power for the lifting and lowering of the inner power head, the rotation of the inner power head, and the rotation and lifting of the outer power head, thereby realizing the sharing of power sources for the inner and outer power heads. There is no need to set up an additional hydraulic system, which can reduce equipment costs. At the same time, when the whole machine only needs to use the inner power head and is under medium and low load conditions, running the main engine can meet the drilling power requirements, achieve drilling, and save energy.

[0042] When the entire machine needs to perform casing drilling operations using both the internal and external power heads, the main and auxiliary engines can be switched on to achieve power output and realize relevant control and actions according to drilling requirements. In addition, when the main engine fails, the auxiliary engine can also be started to ensure power output for all actions of tripping, running down the well, and internal and external power heads, so as to slowly drill or trip the downhole drill string and avoid stuck drill accidents.

[0043] 3. The present invention also provides a control method for the above-mentioned drilling rig, wherein: S1, when dual-power head drilling with casing is required, the casing is connected to the outer power head, and the drill rod is connected to the inner power head, with the drill rod passing through the casing from top to bottom; S11, when encountering loose and extremely complex formations, the drilling speed of the inner and outer power heads is adjusted so that the drill bit of the drill rod is located inside the casing, and its drill bit end face is higher than the casing shoe of the casing, the casing drills first, the drill bit follows, and a safety cavity is formed between the drill rod and the casing; S12, when encountering hard formations, the drilling speed of the inner and outer power heads is adjusted so that the drill bit of the drill rod extends out of the casing, and its drill bit... The casing shoe, with its end face lower than the casing, allows the drill bit to break the rock in front, with the casing following as it drills; S2, when only a single power head drilling rig is needed, simply connect the drill rod or casing to the corresponding power head and start the corresponding power head for drilling operations; this configuration allows the drilling rig provided by the present invention to perform drilling operations in loose and extremely complex strata through the cooperation of internal and external power heads, as well as drilling operations in hard strata through the cooperation of internal and external power heads; for general terrain, one power head can be selected for construction operations according to the rock strata conditions. The dual power head drilling rig improved by the present invention can achieve both dual power head drilling with casing and single power head drilling, and can be flexibly adjusted according to the working conditions. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0045] Figure 1 This is a front view schematic diagram of a dual-power head mounting structure disclosed in this invention. Figure 1 ;

[0046] Figure 2 This is a side view of a dual-power head mounting structure disclosed in this invention. Figure 1 ;

[0047] Figure 3 This is a front view schematic diagram of a dual-power head mounting structure disclosed in this invention. Figure 2 ;

[0048] Figure 4 This is a side view of a dual-power head mounting structure disclosed in this invention. Figure 2 ;

[0049] Figure 5 This is a side view of the internal power head disclosed in this invention;

[0050] Figure 6 This is a three-dimensional schematic diagram of the internal power head disclosed in this invention;

[0051] Figure 7 This is a top view schematic diagram of a dual-power head mounting structure disclosed in this invention;

[0052] Figure 8 This is a front view schematic diagram of the two outer masts installed on the mast operation platform disclosed in this invention;

[0053] Figure 9 This is a three-dimensional schematic diagram of the external power head mounting structure disclosed in this invention;

[0054] Figure 10 This is a three-dimensional schematic diagram of the external lifting cylinder of the present invention mounted on the sliding frame;

[0055] Figure 11 This is a three-dimensional schematic diagram of the sliding frame disclosed in this invention;

[0056] Figure 12 This is a bottom view of the external power head mounting structure disclosed in this invention;

[0057] Figure 13 for Figure 12 A magnified schematic diagram of the I-axis.

[0058] Figure label:

[0059] 1. Mast assembly; 11. Outer mast; 12. Inner mast; 13. Inner slide rail; 14. Guide roller; 15. Outer slide rail; 16. Connecting block; 2. Track plate; 3. Outer lifting cylinder; 4. Outer power head; 41. Outer power head body; 42. Connecting plate;

[0060] 5. Sliding frame; 51. Support frame; 511. Base plate; 512. Side plate; 513. Cover plate; 514. Cylinder mounting plate; 52. Rail clamps; 53. Clamp connectors; 54. Wear-resistant plate;

[0061] 6. Support; 7. Internal lifting cylinder; 8. Mast connector;

[0062] 9. Internal power head; 91. Internal power head body; 92. Track pulley;

[0063] 10. Internal power head follow-up structure; 101. Wire rope; 102. Pulley block; 103. Wire rope fixing seat; 01. Casing; 02. Drill rod; 03. Mast operating platform.

[0064] The realization of the objective, functional characteristics and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0065] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0067] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0068] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0069] Example 1

[0070] See Figures 1-13 The present invention provides a dual-power head mounting structure, comprising:

[0071] The mast assembly 1 includes two outer masts 11 spaced apart and an inner mast 12 slidably disposed between the two outer masts 11;

[0072] Two track plates 2 are detachably connected to the front of the corresponding outer mast 11. Specifically, in this embodiment, the front of each outer mast 11 is provided with a plurality of connecting blocks 16 at intervals, and the connecting blocks 16 are provided with threaded holes. Correspondingly, the track plate 2 is provided with countersunk holes that match the threads, thereby realizing the detachable connection between the track plate 2 and the outer mast 11 through the connecting blocks 16.

[0073] Two external lifting cylinders 3 are used to drive the external power head 4 to move up and down;

[0074] The external power head 4 is slidably connected to the track plate 2 via the sliding frame 5, and is used to connect the casing 01 and realize rock breaking drilling under the action of the external lifting cylinder 3; in this embodiment, the power head body is a power head that can drill large-diameter deep holes of more than 450mm;

[0075] The telescopic ends of the external lifting cylinder 3 pass through the corresponding sliding frame 5 from top to bottom. The cylinder barrel is connected to the end face of the sliding frame 5 near the mast operating platform 03, and its telescopic end is connected to the mast operating platform 03 through the support 6. Specifically, the support 6 is fixedly connected to the mast operating platform 03 by welding or bolts, and the telescopic end of the external lifting cylinder 3 is connected to the support 6 through the pin.

[0076] Two internal lifting cylinders 7 are respectively installed inside the corresponding outer masts 11, and their two telescopic ends are connected to the top of the inner masts 12 through mast connectors 8;

[0077] Specifically, the outer mast 11 is a column with a hollow inner cavity. The cylinder of the inner lifting cylinder 7 is placed inside the outer mast 11, and the cylinder near the telescopic end is fixedly connected to the top surface of the outer mast 11. The inner power head 9 is slidably disposed on the front of the inner mast 12 and is used to connect the drill pipe 02 and lift or press it down under the action of the inner lifting cylinder 7 to achieve drilling or tripping. The outer power head 4 and the inner power head 9 are coaxially arranged vertically. When the telescopic end of the inner lifting cylinder 7 extends upward, the inner mast 12 is moved upward through the mast connector 8, and the inner power head 9 disposed on the front of the inner mast 12 is moved upward at the same time. When retracting downward, the inner mast 12 is moved downward through the mast connector 8, and the inner power head 9 disposed on the front of the inner mast 12 is moved downward at the same time.

[0078] In this invention, by setting an outer mast 11 and an inner mast 12, with the inner mast 12 slidably disposed between the two outer masts 11, and the inner power head 9 slidably disposed on the front of the inner mast 12, and the outer power head 4 detachably disposed on the front of the outer mast 11 via an outer power head 4 mounting structure, and with the inner power head 9 and outer power head 4 coaxially arranged from top to bottom, the drill pipe 02 mounted on the inner power head 9 and the casing 01 mounted on the outer power head 4 can be coaxially arranged, thus allowing the inner and outer power heads 4 to share a wellhead; and the coaxial vertical spacing of the inner and outer power heads 4 allows the drill pipe 02 to pass through the casing 01 and match each other for operation, achieving dual-power head drilling with casing while satisfying the compact structure of the whole machine; specifically, when encountering goaf areas, In complex formations such as collapse zones, karst caves, and loose strata, mud loss is common, making rapid drilling with conventional drill bits impossible. However, the dual-power head installation structure provided by this invention allows control of the rotational speeds of the inner and outer power heads 4, ensuring that the drill bit end face of the drill rod 02 is higher than the casing 01 shoe of the casing 01. The casing 01 drills first, followed by the drill bit, creating a safety cavity between the drill rod 02 and the casing 01. This prevents drilling fluid loss during conventional mud drilling, ensuring normal circulation of drilling fluid when the inner power head 9 is drilling normally. When encountering normal rock formations with hard strata, the relative drilling speeds of the inner power head 9 and the outer power head 4 can be adjusted, allowing the drill rod 02 (controlled by the inner power head 9) to drill first, resulting in high rock-breaking efficiency, while the casing 01 drills closely behind, leading to higher overall efficiency of dual-power head drilling with casing.

[0079] In addition, in this invention, the external power head 4 is detachably mounted on the front of the outer mast 11 via an external power head 4 mounting structure. Specifically, several connecting blocks 16 are provided on the side of the mast, and the track plate 2 is detachably connected to the connecting blocks 16; and the sliding frame 5 is slidably mounted on the track plate 2, with the power head connected to the sliding frame 5 via the connecting plate 42. With this configuration, during transportation, the power head can be removed from the sliding frame 5, and the sliding frame 5 can also be removed from the track plate 2; the track plate 2 can also be removed from the connecting blocks 16, thereby effectively reducing the overall weight of the equipment. The overall weight and height of the machine meet the requirements of national road regulations. The telescopic end of the external lifting cylinder 3 passes through the sliding frame 5 from top to bottom. Its cylinder is connected to the end face of the sliding frame 5 near the mast operating platform 03, and its telescopic end is connected to the mast operating platform 03 through the support 6. With this configuration, since the rod end of the external lifting cylinder 3 is fixedly connected to the mast operating platform 03, and its cylinder is connected to the end face of the sliding frame 5 near the mast operating platform 03, the telescopic movement of the external lifting cylinder 3 can drive the sliding frame 5 to move up and down, thereby driving the power head to move up and down, and thus realizing the up and down sliding of the power head on the mast wellhead side.

[0080] In a preferred embodiment, the dual-power head mounting structure further includes an inner power head follower structure 10. The inner power head follower structure 10 includes a wire rope 101, a pulley block 102 disposed on the mast connector 8, and a wire rope fixing seat 103 disposed on the back of the outer mast 11. One end of the wire rope 101 is connected to the top end of the inner power head 9, and the other end passes around the pulley block 102 and is fixedly connected to the wire rope fixing seat 103.

[0081] The internal power head follower structure 10 allows the internal lifting cylinder 7 to simultaneously raise and lower the internal power head 9 as it extends upward or retracts downward. Specifically, during the connection process, the internal power head 9 is first lowered to its lowest position, then the drill rod 02 is connected to the internal power head 9. The internal lifting cylinder 7 then extends upward, causing the inner mast 12 to move upward. Since one end of the wire rope 101 is fixed to the back of the outer mast 11 via the wire rope fixing seat 103, during the upward movement of the inner mast 12, the wire rope 101 drives the internal power head 9 to rise, gradually erecting the drill rod 02. Then, the internal lifting cylinder 7 is controlled to retract downward, causing the drill rod 02 to pass through the outer power head 4 and move downward.

[0082] As a preferred embodiment, the dual-power head mounting structure further includes a hydraulic control system, which includes a main engine and an auxiliary engine connected in parallel. The main engine and the auxiliary engine can provide hydraulic power for the lifting and lowering of the inner power head 9, the rotation of the inner power head 9, and the rotation and lifting of the outer power head 4, respectively.

[0083] In the hydraulic system, the main engine and auxiliary engine, which are set in parallel, can provide hydraulic power for the lifting and lowering of the inner power head 9, the rotation of the inner power head 9, and the rotation and lifting of the outer power head 4, respectively. This enables the sharing of power sources for the inner and outer power heads 4, eliminating the need for an additional hydraulic system and reducing equipment costs. At the same time, when the whole machine only needs to use the inner power head 9 and is under medium to low load conditions, running the main engine can meet the drilling power requirements, achieve drilling, and save energy.

[0084] When the entire machine needs to perform casing drilling operations using both the internal power head 9 and the external power head 4, the main and auxiliary engines can be switched on to achieve power output and realize relevant control and actions according to drilling requirements. In addition, when the main engine fails, the auxiliary engine can also be started to ensure the power output for all actions of tripping, tripping, and internal and external power heads 4, so as to slowly drill or trip the downhole drill string and avoid stuck drill accidents.

[0085] As a preferred embodiment, see Figures 5-7The internal power head 9 includes an internal power head body 91 and a track pulley 92 disposed on the back of the internal power head body 91;

[0086] Correspondingly, inner slide rails 13 matching the track pulleys 92 are respectively provided on both sides of the front of the inner mast 12. The track pulleys 92 are correspondingly matched and locked on the slide rails to achieve a slidable connection.

[0087] For details, see Figure 7 In this embodiment, the back of the inner power head body 91 is provided with two sets of track pulleys 92, which are respectively locked on the inner slide rail 13. Each set of track pulleys 92 includes three pairs of track pulleys 92, which are arranged at intervals from top to bottom on the back of the inner power head body 91.

[0088] The inner slide rail 13 is welded to the square tubes on both sides of the inner mast 12.

[0089] As a preferred embodiment, see Figures 5-7 The inner mast 12 is provided with guide rollers 14 on both sides, and correspondingly, the two outer masts 11 are provided with outer slide rails 15 on their respective sides. The guide rollers 14 are matched and locked on the outer slide rails 15 to achieve a slidable connection.

[0090] Specifically, the two guide rollers 14 are rotatably mounted on both sides of the inner mast 12 via a rotating shaft. The rotating shaft passes laterally through the inner mast 12, and the guide rollers 14 are respectively provided on the extension sections extending out from both sides of the inner mast 12.

[0091] In a preferred embodiment, the external power head 4 includes an external power head body 41 and a connecting plate 42 disposed on one side of the external power head body 41;

[0092] The external power head 4 is connected to the sliding frame 5 via the connecting plate 42;

[0093] In this embodiment, two connecting plates 42 are provided on one side of the power head body, and the two connecting plates 42 are symmetrically arranged about the power head body; the external power head 4 is connected to the corresponding sliding frame 5 through the two connecting plates 42.

[0094] As a preferred embodiment, see Figure 9 , Figure 11 and Figure 13 The sliding frame 5 includes a support frame 51, two track clips 52 and two clip connectors 53. The track clips 52 are disposed on both sides of the support frame 51 through the clip connectors 53, and the two track clips 52 are symmetrically arranged about the center of the support frame 51 so that the sliding frame 5 can be slidably sleeved on the track plate 2.

[0095] Specifically, in this embodiment, the track clamp 52 has an L-shaped cross-section, and the clamp connector 53 is a strip plate. One side of the strip plate is bolted to the track clamp 52, and the other side is bolted to the support frame 51. The paired track clamps 52 and the outer wall of the support frame 51 form a sliding cavity. The sliding cavity is correspondingly sleeved on the track plate 2, which can effectively avoid the connecting block 16 set on the column while satisfying the sliding requirement.

[0096] As a preferred embodiment, see Figure 11 The support frame 51 includes a base plate 511, two side plates 512 vertically arranged on the base plate 511, and a cover plate 513;

[0097] The two side plates 512 are arranged parallel to each other on the base plate 511 at intervals. The cover plate 513 covers the upper end of the two side plates 512 and forms a mounting through hole for the external lifting cylinder 3 to pass through. The cover plate 513 is provided with a plurality of power head mounting holes. The connecting plate 42 of the power head is fastened to the cover plate 513 by bolts.

[0098] It also includes a cylinder mounting plate 514, which is plugged at one end of the mounting through hole and is used to fix and install with the cylinder of the external lifting cylinder 3.

[0099] The back of the bottom and the paired track clips 52 form the sliding cavity;

[0100] This configuration integrates the sliding frame 5 with the sliding capability, the installation of the external lifting cylinder 3, and the installation of the power head into a single unit, resulting in a compact structure and high integration.

[0101] As a preferred embodiment, see Figure 9 and Figure 13 A wear-resistant plate 54 is also provided between the sliding frame 5 and the track plate 2. Specifically, the wear-resistant plate 54 is provided on the two bent edges of the track clamp 52. The wear-resistant plate 54 can prevent dry friction between the sliding frame 5 and the track plate 2, thus reducing the service life. Preferably, the wear-resistant plate 54 can be made of nylon, which is both wear-resistant and lubricating.

[0102] Example 2

[0103] The present invention also provides a drilling rig, including a drilling rig body and a dual power head mounting structure as described in Embodiment 1, disposed on the drilling rig body; and a drill rod 02 connected to the inner power head 9 and a casing 01 connected to the outer power head 4;

[0104] During transportation, the mounting structure related to the external power head 4 is removed without increasing the overall height and weight of the drilling rig, facilitating transport. By additionally configuring an external power head 4 with a large-diameter deep hole of 450mm or more on the outer mast 11, dual-power head casing drilling can be achieved. For details, see [link to documentation]. Figures 1-4 ,

[0105] When doing the assignment, see Figure 1 and Figure 2 When encountering loose and extremely complex formations, the drilling speeds of the inner power head 9 and the outer power head 4 are adjusted so that the drill bit of the drill rod 02 is located inside the casing 01, and its drill bit end face is higher than the casing 01 shoe of the casing 01. The casing 01 drills in front, and the drill bit follows, forming a safety cavity between the drill rod 02 and the casing 01; see also Figure 3 and Figure 4 When encountering hard strata, the drilling speed of the inner power head 9 and the outer power head 4 is adjusted so that the drill bit of the drill rod 02 extends out of the casing 01 and its drill bit end face is lower than the casing 01 shoe of the casing 01. The drill bit breaks the rock in front and the casing 01 follows the drilling; the rock breaking efficiency is high.

[0106] Example 3

[0107] The present invention also provides a control method for a drilling rig as provided in Embodiment 2, the steps of which include:

[0108] S1. When dual-power-head drilling with casing is required, the casing 01 is connected to the outer power head 4, and the drill rod 02 is connected to the inner power head 9, with the drill rod 02 passing through the casing 01 from top to bottom:

[0109] S11. When encountering loose and extremely complex strata, adjust the drilling speed of the inner power head 9 and the outer power head 4 so that the drill bit of the drill rod 02 is located inside the casing 01 and its drill bit end face is higher than the casing 01 shoe of the casing 01. The casing 01 drills in front and the drill bit follows, forming a safety cavity between the drill rod 02 and the casing 01.

[0110] S12. When encountering hard strata, adjust the drilling speed of the inner power head 9 and the outer power head 4 so that the drill bit of the drill rod 02 extends out of the casing 01 and its drill bit end face is lower than the casing 01 shoe of the casing 01. The drill bit breaks the rock in front and the casing 01 follows the drilling.

[0111] S2. When only a single power head drilling rig is needed, simply connect the drill rod 02 or casing 01 to the corresponding power head and start the corresponding power head to perform drilling operations.

[0112] This configuration allows the drilling rig provided by the present invention to perform drilling operations in loose and complex strata through the cooperation of the inner and outer power heads 4, as well as drilling operations in hard strata through the cooperation of the inner and outer power heads 4. For general terrain, one of the power heads can be selected for construction operations according to the rock strata conditions. The dual-power head drilling rig improved by the present invention can achieve both dual-power head drilling with casing and single-power head drilling, and can be flexibly adjusted according to the working conditions.

[0113] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A dual-power head mounting structure, characterized in that, include: A mast assembly comprising two outer masts spaced apart and an inner mast slidably disposed between the two outer masts; Two track plates are detachably connected to the front of the corresponding outer mast; An external power head is slidably connected to the track plate via a sliding frame; Two external lifting cylinders are used to drive the external power head to move up and down. The external power head is used to connect the casing and realize rock breaking drilling under the action of the external lifting cylinders. The telescopic ends of the external lifting cylinders pass through the corresponding sliding frames from top to bottom. The cylinder barrels are connected to the end face of the sliding frame near the mast operating platform, and the telescopic ends are connected to the mast operating platform through supports. Two internal lifting cylinders are respectively installed inside the corresponding outer mast, and their two telescopic ends are connected to the top of the inner mast through mast connectors; An internal power head is slidably mounted on the front of the inner mast, used to connect the drill pipe and to lift or press down under the action of the internal lifting cylinder to achieve drilling or tripping; the external power head and the internal power head are coaxially arranged; the internal power head includes an internal power head body and a track pulley disposed on the back of the internal power head body; correspondingly, internal slide rails matching the track pulleys are respectively provided on both sides of the front of the inner mast, and the track pulleys are correspondingly matched and locked on the slide rails to achieve a slidable connection; The hydraulic control system includes a main engine and an auxiliary engine connected in parallel. The main engine and the auxiliary engine can provide hydraulic power for the lifting and lowering of the internal power head, the rotation of the internal power head, and the rotation and lifting of the external power head, respectively.

2. The dual-power head mounting structure according to claim 1, characterized in that, The dual-power head mounting structure also includes an inner power head follower structure, which includes a wire rope, a pulley block on the mast connector, and a wire rope fixing seat on the back of the outer mast. One end of the wire rope is connected to the top of the inner power head, and the other end passes around the pulley block and is connected to the wire rope fixing seat.

3. A dual-power head mounting structure according to claim 1 or 2, characterized in that, Guide rollers are provided on both sides of the inner mast, and correspondingly, outer slide rails are provided on the corresponding sides of the two outer masts. The guide rollers are matched and locked on the outer slide rails to achieve a slidable connection.

4. A dual-power head mounting structure according to claim 1 or 2, characterized in that, The external power head includes an external power head body and a connecting plate disposed on one side of the external power head body; The external power head is connected to the sliding frame via the connecting plate.

5. A dual-power head mounting structure according to claim 1 or 2, characterized in that, The sliding frame includes a support frame, two track clips and two clip connectors. The track clips are disposed on both sides of the support frame through the clip connectors, and the two track clips are symmetrically arranged about the center of the support frame, so that the sliding frame can be slidably sleeved on the track plate. The track clamp has an L-shaped cross-section.

6. The dual-power head mounting structure according to claim 5, characterized in that, The support frame includes a base plate, two side plates vertically arranged on the base plate, and a cover plate; The two side plates are arranged parallel to each other on the base plate, and the cover plate is placed on the upper end of the two side plates, forming a mounting through hole for the external lifting cylinder to pass through; It also includes a cylinder mounting plate, which is installed at one end of the mounting through hole for fixed installation with the cylinder of the external lifting cylinder.

7. A drilling rig, characterized in that, It includes a drilling rig body and a dual-power head mounting structure as described in any one of claims 1-6, which is disposed on the drilling rig body.

8. A control method for a drilling rig as described in claim 7, characterized in that, The steps include: S1. When dual-power-head casing drilling is required, the casing is connected to the outer power head, and the drill rod is connected to the inner power head, with the drill rod passing through the casing from top to bottom: S11. When encountering loose and extremely complex formations, adjust the drilling speed of the inner power head and the outer power head so that the drill bit of the drill rod is located inside the casing and its drill bit end face is higher than the casing shoe of the casing. The casing is drilled in front and the drill bit follows, forming a safety cavity between the drill rod and the casing. S12. When encountering hard strata, adjust the drilling speed of the inner power head and the outer power head so that the drill bit of the drill rod extends out of the casing and its drill bit end face is lower than the casing shoe of the casing. The drill bit breaks the rock in front and the casing follows the drilling. S2. When only a single power head drilling rig is needed, simply connect the drill rod or casing to the corresponding power head and start the corresponding power head to perform drilling operations.

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