Double-power-head mounting structure, drilling machine and control method

Abstract

The invention provides a double-power-head mounting structure, a drilling machine and a control method, and the mounting structure comprises a mast assembly which comprises two outer masts and an inner mast which is slidably arranged between the two outer masts; the two track plates are detachably connected with the front surfaces of the corresponding outer masts respectively; the outer lifting oil cylinder is used for driving the outer power head to move up and down; the outer power head is slidably connected with the track plate through a sliding frame; the telescopic ends of the outer lifting oil cylinders penetrate through the corresponding sliding frames from top to bottom, cylinder barrels of the outer lifting oil cylinders are connected with the end faces, close to the mast operation platform, of the sliding frames, and the telescopic ends of the outer lifting oil cylinders are connected with the mast operation platform through supports. The two inner lifting oil cylinders are arranged in the corresponding outer masts respectively, and the two telescopic ends of the inner lifting oil cylinders are connected with the top ends of the inner masts through mast connecting pieces; the inner power head is slidably arranged on the front surface of the inner mast; the outer power head and the inner power head are coaxially arranged up and down; the double power heads can share the same well mouth, and double power head casing-following drilling can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling rigs, and in particular to a dual-power head installation structure, a drilling rig and a control method. Background Art

[0002] According to the existing market demand, in order to meet the drilling and exploration work in ultra-complex formations, it is considered to add a set of power heads (external power heads) that can be used for large-diameter deep holes above 450mm to the conventional drilling rigs, which can only be equipped with a single power head (internal power head). During normal routine operations, the equipped internal power head can realize conventional drilling operations such as conventional coalbed methane, geothermal, water wells, and oil exploration and development. When encountering ultra-complex formations such as aquifers, goafs, caving areas, caves, and loose formations, a large-diameter external power head can be used for dual-power head and pipe drilling operations, thereby achieving the rapid drilling requirements of complex formations; but since the external power head is not a necessary power and is only used under special needs, the following problems need to be solved when adding an external power head: 1. Since the inner and outer power heads need to share the same wellhead, how to set the outer power head so that it can share the same wellhead with the inner power head and share the main engine power source with the inner power head to avoid excessive increase in equipment costs; 2. The machine must be compact in structure and capable of dual power heads and pipe drilling; 3. In order to ensure that the weight and height of the whole machine meet the national road transportation regulations, how to realize the rapid disassembly and installation of the external power head, and at the same time realize the lifting function of the external power head.

[0003] 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 engine power source and realize dual power head pipe drilling without increasing the transportation weight and width of the whole machine. Summary of the invention

[0004] The purpose of the present invention is to provide a dual power head installation structure, a drilling rig and a control method, aiming to solve the technical problem of how to install a dual power head without excessively increasing the equipment cost and equipment complexity.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a dual power head installation structure, comprising: 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 faces of corresponding outer masts; Two external lifting cylinders, used to drive the external power head to move up and down; An external power head is slidably connected to the track plate through a sliding frame, and is used to connect the casing and realize rock crushing drilling under the action of the external lifting cylinder; The telescopic ends of the external lifting oil cylinders respectively pass through the corresponding sliding frames from top to bottom, and the cylinder barrels thereof are connected to the end surfaces of the sliding frames close to the mast operating platform, and the telescopic ends thereof are connected to the mast operating platform through the supports; Two inner lifting cylinders are respectively arranged in the corresponding outer masts, and the two telescopic ends thereof are connected to the top of the inner mast through mast connectors; The inner power head can be slidably arranged on the front side of the inner mast, and is used to connect the drill pipe and lift or press down under the action of the inner lifting cylinder to achieve drilling or pulling out; and the outer power head and the inner power head are coaxially arranged up and down.

[0006] As a further improvement of the above-mentioned scheme, the dual power head installation structure also includes an inner power head follower structure, which includes a wire rope, a pulley group arranged on the mast connecting member, and a wire rope fixing seat arranged 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 group and is connected to the wire rope fixing seat.

[0007] As a further improvement of the above scheme, the dual power head installation structure also includes a hydraulic control system, which includes a main engine and an auxiliary engine arranged 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.

[0008] As a further improvement of the above solution, the internal power head includes an internal power head body and a track pulley arranged on the back side of the internal power head body; Correspondingly, inner slide rails matching the track pulley are respectively provided on both sides of the front side of the inner mast, and the track pulley is correspondingly matched and clamped on the slide rails to achieve slidable connection.

[0009] As a further improvement of the above scheme, guide rollers are respectively provided on both side surfaces of the inner mast, and correspondingly, outer slide rails are respectively provided on the corresponding side surfaces of the two outer masts, and the guide rollers are correspondingly matched and card-mounted on the outer slide rails to realize a slidable connection.

[0010] As a further improvement of the above solution, the external power head includes an external power head body and a connecting plate arranged on one side of the external power head body; The external power head is connected to the sliding frame through the connecting plate.

[0011] As a further improvement of the above scheme, the sliding frame includes a support frame, two track clips and two clip connectors, the track clips are arranged 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 mounted on the track plate.

[0012] As a further improvement of the above solution, the cross-section of the track clamp is L-shaped.

[0013] As a further improvement of the above solution, the support frame includes a bottom plate, two side plates and a cover plate vertically arranged on the bottom plate; The two side plates are arranged on the bottom plate in parallel with each other, and the cover plate is arranged on the upper ends of the two side plates and forms a mounting through hole for the outer lifting cylinder to pass through; It also includes a cylinder mounting plate, which is blocked at one end of the mounting through hole and is used for fixed installation with the cylinder of the external lifting cylinder.

[0014] As a further improvement of the above solution, the cover plate is provided with a plurality of power head mounting holes, and the connecting plate of the power head is fastened to the cover plate by bolts.

[0015] As a further improvement of the above solution, a wear-resistant plate is further provided between the sliding frame and the track plate.

[0016] As a further improvement of the above solution, a plurality of connection blocks are arranged at intervals on the front of the outer mast, and the track plate is detachably connected to the connection blocks; Specifically, the connecting block is a nut plate, including a plate body and a threaded hole arranged on the plate body; correspondingly, the track plate is provided with a plurality of countersunk holes matching and connected with the threaded holes.

[0017] In a second aspect, the present invention further provides a drilling rig, comprising a drilling rig body and a dual power head mounting structure as provided in the first aspect and arranged on the drilling rig body.

[0018] In a third aspect, the present invention further provides a method for controlling a drilling rig as provided in the second aspect, the steps of which include: S1. When dual power heads are required for drilling with pipes, the casing is connected to the outer power head, the drill rod is connected to the inner power head, and the drill rod passes through the casing from top to bottom: S11. When encountering loose and super-complex formations, the drilling speeds of the inner power head and the outer power head are adjusted so that the drill bit of the drill pipe is located inside the casing and the end face of the drill bit is higher than the casing shoe of the casing, the casing is drilled in front and the drill bit follows, and a safety cavity is formed between the drill pipe and the casing; S12. When encountering hard formations, the drilling speeds of the inner power head and the outer power head are adjusted so that the drill bit of the drill pipe extends out of the casing and the end face of the drill bit 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, it is only necessary to connect the drill rod or casing to the corresponding power head and start the corresponding power head to perform drilling operations.

[0019] Since the present invention adopts the above technical solution, the beneficial effects of this application are: 1. The present invention provides a dual-power head installation structure, which is provided with an outer mast and an inner mast, and the inner mast can be slidably arranged between the two outer masts, the inner power head can be slidably arranged on the front of the inner mast, and the outer power head can be detachably arranged on the front of the outer mast through the outer power head installation structure. At the same time, the inner power head and the outer power head are coaxially arranged from top to bottom, so that the drill rod installed on the inner power head and the casing installed on the outer power head can be coaxially arranged, so that the inner and outer power heads can share a wellhead; and the inner and outer power heads are coaxially arranged at intervals up and down, so that the drill rod can pass through the casing to match each other for operation, and the dual power head following pipe drilling is realized while meeting the compact structure of the whole machine; specifically, when encountering a void When drilling in ultra-complex formations such as deep wells, caving areas, karst caves, and loose formations, mud leakage is prone to occur, and conventional drill bits cannot be used for rapid drilling. However, the dual-power head installation structure provided by the present invention can be used to control the rotation speed of the inner and outer power heads so that the end face of the drill pipe drill bit is higher than the casing shoe of the casing, the casing is drilled in front, and the drill bit follows the drilling, forming a safety chamber between the drill pipe and the casing; so that the drilling fluid does not leak during conventional mud drilling, so as to ensure the normal circulation of the drilling fluid when the inner power head drills normally; when encountering normal rock hard formations, the mutual drilling speeds of the inner and outer power heads can be adjusted, so that the drill pipe drilling (controlled by the inner power head) is in front, the rock breaking efficiency is high, and the casing drilling follows closely, and the overall efficiency of the dual-power head following the casing drilling will be higher; In addition, in the present invention, the external power head is detachably arranged on the front side of the external mast through the external power head mounting structure. Specifically, by arranging a plurality of connecting blocks on the side of the mast, the track plate is detachably connected to the connecting blocks; and the sliding frame is slidably arranged on the track plate, and the power head is connected to the sliding frame through the connecting plate; such an arrangement allows the power head to be removed from the sliding frame during transportation, and the sliding frame can also be removed from the track plate; the track plate can also be removed from the connecting block, thereby effectively reducing the weight of the entire equipment. The weight and height of the whole machine meet the requirements of national road regulations; the telescopic end of the external lifting cylinder passes through the sliding frame from top to bottom, and its cylinder barrel is connected to the end face of the sliding frame close to the mast operating platform, and its telescopic end is connected to the mast operating platform through a support; such an arrangement, since the rod end of the external lifting cylinder is fixedly connected to the mast operating platform, and its cylinder barrel is connected to the end face of the sliding frame close to 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 then realizing the power head sliding up and down on the mast wellhead side.

[0020] 2. The present invention provides a dual-power head installation structure, the dual-power head installation structure also includes a hydraulic control system, the hydraulic control system includes a main engine and an auxiliary engine arranged 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 main engine and the auxiliary engine arranged in parallel 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 of the inner and outer power heads, without the need to set up an additional hydraulic system, thereby reducing equipment costs, and at the same time, when the whole machine only needs to use the inner power head and is in a medium and low load condition, running the main engine can meet the drilling power demand, achieve drilling, and save energy; When the whole machine needs to use both the internal power head and the external power head for pipe following drilling operations, the main engine and the auxiliary engine can be started to realize power output, and relevant control and actions can be realized according to the drilling requirements. In addition, when the main engine fails, the auxiliary engine can also be started to ensure the power output of pulling out and drilling down and all actions of the internal and external power heads, so as to slowly drill or pull out the downhole drilling tools to avoid drill sticking accidents.

[0021] 3. The present invention also provides a control method for the above-mentioned drilling rig, S1. When dual power heads are required for follow-up drilling, the casing is connected to the external power head, the drill rod is connected to the internal power head, and the drill rod passes through the casing from top to bottom: S11. When encountering loose and ultra-complex formations, adjust the drilling speeds of the internal power head and the external power head so that the drill bit of the drill rod is located inside the casing, and the end face of the drill bit is higher than the casing shoe of the casing, the casing is drilled in front, and the drill bit follows the drilling, and a safety cavity is formed between the drill rod and the casing; S12. When encountering hard formations, adjust the drilling speeds of the internal power head and the external power head so that the drill bit of the drill rod extends out of the casing, and its drill bit The end face of the casing shoe is lower than that 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, it is only necessary to connect the drill rod or casing to the corresponding power head, and start the corresponding power head to perform the drilling operation; such a setting enables the drilling rig provided by the present invention to realize the drilling operation in loose and ultra-complex formations through the cooperation of the internal and external power heads, and to realize the drilling operation in hard formations through the cooperation of the internal and external power heads; for general terrain, one of the power heads can be selected separately for construction operations according to the rock formation conditions. The dual-power head drilling rig improved by the present invention can realize dual-power head following pipe drilling and can also select one of the single power heads for drilling, and can be flexibly adjusted according to the working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of a dual power head installation structure disclosed in the present invention Figure 1 ; Figure 2 A side view schematic diagram of a dual power head installation structure disclosed in the present invention Figure 1 ; Figure 3 A schematic diagram of a dual power head installation structure disclosed in the present invention Figure 2 ; Figure 4 A side view schematic diagram of a dual power head installation structure disclosed in the present invention Figure 2 ; Figure 5 It is a side view schematic diagram of the internal power head disclosed in the present invention; Figure 6 It is a three-dimensional schematic diagram of the internal power head disclosed in the present invention; Figure 7 It is a top view schematic diagram of a dual power head installation structure disclosed in the present invention; Figure 8 It is a front view schematic diagram of two outer masts disclosed in the present invention being arranged on a mast operating platform; Fig. 9 It is a three-dimensional schematic diagram of the external power head installation structure disclosed in the present invention; Fig.10 It is a three-dimensional schematic diagram of the external lifting cylinder disclosed in the present invention being arranged on a sliding frame; Fig.11 It is a three-dimensional schematic diagram of the sliding frame disclosed in the present invention; Fig.12 It is a bottom view schematic diagram of the external power head installation structure disclosed in the present invention; Fig.13 for Fig.12 A local enlarged schematic diagram of the I direction.

[0024] Reference numerals: 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; 5. Sliding frame; 51. Support frame; 511. Bottom plate; 512. Side plate; 513. Cover plate; 514. Cylinder mounting plate; 52. Track clamp; 53. Clamp connector; 54. Wear-resistant plate; 6. Support; 7. Internal lifting cylinder; 8. Mast connecting parts; 9. Internal power head; 91. Internal power head body; 92. Track pulley; 10. Internal power head follower structure; 101. Wire rope; 102. Pulley block; 103. Wire rope fixing seat; 01. Casing; 02. Drill pipe; 03. Mast operating platform.

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0029] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] Example 1 See also Figure 1-Figure 13 The present invention provides a dual power head installation structure, comprising: The mast assembly 1 comprises two outer masts 11 arranged at intervals and an inner mast 12 slidably arranged between the two outer masts 11; The two track plates 2 are detachably connected to the front faces of the corresponding outer masts 11; specifically, in this embodiment, the front faces of the outer masts 11 are each provided with a plurality of connection blocks 16 at intervals, and the connection blocks 16 are provided with threaded holes, and correspondingly, the track plates 2 are provided with countersunk holes matching the threads, so that the track plates 2 are detachably connected to the outer masts 11 through the connection blocks 16; Two external lifting cylinders 3 are used to drive the external power head 4 to move up and down; The external power head 4 is slidably connected to the track plate 2 through a sliding frame 5, and is used to connect the casing 01 and realize rock crushing drilling under the action of the external lifting cylinder 3; in this embodiment, the power head body is a power head that can drill a large-diameter deep hole of more than 450 mm; The telescopic ends of the outer lifting oil cylinder 3 respectively pass through the corresponding sliding frame 5 from top to bottom, and the cylinder barrel thereof is connected to the end surface of the sliding frame 5 close to the mast operating platform 03, and the telescopic end thereof is connected to the mast operating platform 03 through a 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 outer lifting oil cylinder 3 is connected to the support 6 through a pin shaft; Two inner lifting cylinders 7 are respectively arranged in the corresponding outer masts 11, and the two telescopic ends thereof are connected to the top of the inner mast 12 through the mast connector 8; Specifically, the outer mast 11 is a column with a hollow inner cavity, the cylinder barrel of the inner lifting cylinder 7 is placed in the outer mast 11, and the cylinder barrel is fixedly connected to the top surface of the outer mast 11 near the telescopic end, and the inner power head 9 is slidably arranged on the front of the inner mast 12, and is used to connect the drill rod 02 and lift or press down to achieve drilling or pulling out under the action of the inner lifting cylinder 7; and the outer power head 4 and the inner power head 9 are coaxially arranged up and down; when the telescopic end of the inner lifting cylinder 7 is extended upward, the inner mast 12 is driven to move upward through the mast connecting member 8, and at the same time, the inner power head 9 arranged on the front of the inner mast 12 is driven to move upward; when it is retracted downward, the inner mast 12 is driven to move downward through the mast connecting member 8, and at the same time, the inner power head 9 arranged on the front of the inner mast 12 is driven to move downward; In the present invention, an outer mast 11 and an inner mast 12 are provided, and the inner mast 12 can be slidably provided between the two outer masts 11, the inner power head 9 can be slidably provided on the front face of the inner mast 12, and the outer power head 4 can be detachably provided on the front face of the outer mast 11 through the outer power head 4 mounting structure, and at the same time, the inner power head 9 and the outer power head 4 are coaxially provided from top to bottom, so that the drill rod 02 installed on the inner power head 9 and the casing 01 installed on the outer power head 4 can be coaxially provided, so that the inner and outer power heads 4 can share a wellhead; and the inner and outer power heads 4 are coaxially provided at intervals up and down, so that the drill rod 02 can pass through the casing 01 and match each other to operate, thereby realizing double power head following pipe drilling while satisfying the compact structure of the whole machine; specifically, when encountering goaf, When drilling in ultra-complex formations such as caving areas, karst caves, and loose formations, mud leakage is prone to occur, and conventional drill bits cannot be used for rapid drilling. However, the dual-power head installation structure provided by the present invention can be used to control the rotation speed of the inner and outer power heads 4 so that the end face of the drill bit of the drill rod 02 is higher than the casing 01 boot of the casing 01, and the casing 01 is drilled in front and the drill bit follows the drilling, forming a safety chamber between the drill rod 02 and the casing 01; so that the drilling fluid does not leak during conventional mud drilling, so as to ensure the normal circulation of the drilling fluid when the inner power head 9 drills normally; when encountering normal rock hard formations, the mutual drilling speeds of the inner power head 9 and the outer power head 4 can be adjusted, so that the drill rod 02 drills (controlled by the inner power head 9) in front, with high rock breaking efficiency, and the casing 01 drills closely behind, and the overall efficiency of dual-power head follow-up drilling will be higher; In addition, in the present invention, the external power head 4 is detachably arranged on the front side of the outer mast 11 through the external power head 4 mounting structure. Specifically, by arranging a plurality of connecting blocks 16 on the side of the mast, the track plate 2 is detachably connected to the connecting block 16; and the sliding frame 5 is slidably arranged on the track plate 2, and the power head is connected to the sliding frame 5 through the connecting plate 42; with such an arrangement, 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 block 16, thereby effectively reducing the weight of the entire equipment. The amount is so that the weight and height of the whole 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, and its cylinder barrel is connected to the end face of the sliding frame 5 close to the mast operating platform 03, and its telescopic end is connected to the mast operating platform 03 through the support 6; such a setting, since the rod end of the external lifting cylinder 3 is fixedly connected to the mast operating platform 03, and its cylinder barrel is connected to the end face of the sliding frame 5 close to 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 then realizing the power head sliding up and down on the mast wellhead side.

[0031] As a preferred embodiment, the dual power head installation structure also includes an inner power head follower structure 10, the inner power head follower structure 10 includes a wire rope 101, a pulley block 102 arranged on the mast connector 8, and a wire rope fixing seat 103 arranged on the back of the outer mast 11, one end of the wire rope 101 is connected to the top of the inner power head 9, and the other end passes through the pulley block 102 and is fixedly connected to the wire rope fixing seat 103; The setting of the inner power head follower structure 10 enables the inner lifting cylinder 7 to drive the inner power head 9 to rise and fall during the process of extending upward or retracting downward; specifically, when connecting the rod, the inner power head 9 is first lowered to the lowest position, and then the drill rod 02 is connected to the inner power head 9, and then the inner lifting cylinder 7 is extended upward to drive 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 through the wire rope fixing seat 103, during the process of the inner mast 12 moving upward, the inner power head 9 is driven to rise by the wire rope 101 to gradually erect the drill rod 02; then the inner lifting cylinder 7 is controlled to retract downward, and the drill rod 02 passes through the outer power head 4 and moves downward.

[0032] As a preferred embodiment, the dual power head installation structure further includes a hydraulic control system, which includes a main engine and an auxiliary engine arranged in parallel, and the main engine and the auxiliary engine can respectively 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 and lowering of the outer power head 4; In the hydraulic system, the main engine and the auxiliary engine arranged 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, so as to realize the sharing of the power sources of the inner and outer power heads 4, without setting up an additional hydraulic system, thereby reducing the equipment cost. At the same time, when the whole machine only needs to use the inner power head 9 and is in a medium and low load condition, running the main engine can meet the drilling power demand, realize drilling, and save energy; When the whole machine needs to use the internal power head 9 and the external power head 4 for pipe following drilling operations at the same time, the main engine and the auxiliary engine can be started at the same time to realize power output, and realize relevant control and actions according to the drilling requirements; in addition, when the main engine fails, the auxiliary engine can also be started to ensure the power output of pulling out and drilling down and all actions of the internal and external power heads 4, so as to slowly drill or pull out the downhole drilling tools to avoid drill sticking accidents.

[0033] As a preferred embodiment, see Figure 5-Figure 7 The internal power head 9 includes an internal power head body 91 and a track pulley 92 arranged on the back of the internal power head body 91; Correspondingly, inner slide rails 13 matching the track pulley 92 are respectively provided on both sides of the front of the inner mast 12, and the track pulley 92 is correspondingly matched and clamped on the slide rails to achieve slidable connection; For details, see Figure 7 In this embodiment, two groups of track pulleys 92 are arranged on the back of the inner power head body 91, which are respectively clamped on the inner slide rail 13, and each group 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; The inner slide rail 13 is welded with square tubes on both sides of the inner mast 12 .

[0034] As a preferred embodiment, see Figure 5-Figure 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 the corresponding sides, and the guide rollers 14 are matched and mounted on the outer slide rails 15 to achieve slidable connection; Specifically, the two guide rollers 14 are rotatably arranged on both sides of the inner mast 12 via a rotating shaft. The rotating shaft passes through the inner mast 12 transversely, and the guide rollers 14 are respectively arranged on the extension sections extending from both sides of the inner mast 12.

[0035] As a preferred embodiment, the external power head 4 includes an external power head body 41 and a connecting plate 42 arranged on one side of the external power head body 41; The external power head 4 is connected to the sliding frame 5 through the connecting plate 42; 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 with respect to the power head body; the external power head 4 is connected to the corresponding sliding frame 5 through the two connecting plates 42 .

[0036] As a preferred embodiment, see Fig. 9 , Fig.11 and Fig.13 The sliding frame 5 includes a support frame 51, two track clamps 52 and two clamp connectors 53, wherein the track clamps 52 are arranged on both sides of the support frame 51 through the clamp connectors 53, and the two track clamps 52 are symmetrically arranged about the center of the support frame 51, so that the sliding frame 5 can be slidably mounted on the track plate 2; Specifically, in the present embodiment, the cross-section of the track clamp 52 is L-shaped, and the clamp connector 53 is a strip plate, one side of the strip plate is connected to the track clamp 52 by bolts, and the other side of the strip plate is connected to the support frame 51 by bolts; the track clamps 52 arranged in pairs and the outer wall surface of the support frame 51 constitute a sliding cavity, and the corresponding sleeve of the sliding cavity is arranged on the track plate 2, which can effectively avoid the connecting block 16 arranged on the column while meeting the sliding requirement.

[0037] As a preferred embodiment, see Fig.11 The support frame 51 includes a bottom plate 511, two side plates 512 vertically arranged on the bottom plate 511, and a cover plate 513; The two side plates 512 are arranged on the bottom plate 511 in parallel and at intervals, and the cover plate 513 is arranged on the upper ends of the two side plates 512 and forms a mounting through hole for the outer lifting cylinder 3 to pass through; the cover plate 513 is provided with a plurality of power head mounting holes, and the connecting plate 42 of the power head is fastened to the cover plate 513 by bolts; It also includes a cylinder mounting plate 514, which is blocked at one end of the mounting through hole and is used for fixed installation with the cylinder of the outer lifting cylinder 3; The back side of the bottom and the track clamps 52 arranged in pairs form the sliding cavity; Such an arrangement enables the sliding frame 5 to integrate slidability, installation of the external lifting cylinder 3 and installation of the power head, with a compact structure and high integration.

[0038] As a preferred embodiment, see Fig. 9 and Fig.13A wear-resistant plate 54 is also provided between the sliding frame 5 and the track plate 2. Specifically, the wear-resistant plates 54 are respectively provided on the two bent edges of the track clamp 52. The setting of the wear-resistant plate 54 can prevent dry grinding between the sliding frame 5 and the track plate 2, thereby reducing the service life; preferably, the wear-resistant plate 54 can be made of nylon plate, which is both wear-resistant and lubricating.

[0039] Example 2 The present invention further provides a drilling rig, comprising a drilling rig body and a dual-power head mounting structure as provided in Example 1 and arranged 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; During transportation, the installation structure related to the external power head 4 is removed, which will not increase the height and weight of the drilling rig, making it easier to transport; by additionally configuring an external power head 4 with a large-diameter deep hole of more than 450 mm on the outer mast 11; thus, dual power head following pipe drilling can be achieved. For details, see Figure 1-Figure 4 , When working, see Figure 1 and Figure 2 When encountering loose and super-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 the end face of the drill bit is higher than the casing 01 shoe of the casing 01, the casing 01 is drilled in front, and the drill bit follows the drilling, and a safety cavity is formed between the drill rod 02 and the casing 01; see Figure 3 and Figure 4 When encountering hard 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 extends out of the casing 01, and the end face of the drill bit 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.

[0040] Example 3 The present invention also provides a method for controlling a drilling rig as provided in Example 2, the steps of which include: S1. When dual power heads are required for drilling, the casing 01 is connected to the external power head 4, the drill rod 02 is connected to the internal power head 9, and the drill rod 02 passes through the casing 01 from top to bottom: S11. When encountering loose and super-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 the end face of the drill bit is higher than the casing 01 boot of the casing 01, the casing 01 is drilled in front, and the drill bit follows the drilling, and a safety cavity is formed between the drill rod 02 and the casing 01; S12, when encountering hard formations, adjusting the drilling speeds 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 the end face of the drill bit 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; S2. When only a single power head drilling rig is needed, it is only necessary to connect the drill rod 02 or the casing 01 to the corresponding power head and start the corresponding power head to perform drilling operations; Such an arrangement enables the drilling rig provided by the present invention to realize drilling operations in loose and ultra-complex formations through the cooperation of the inner and outer power heads 4, and also to realize drilling operations in hard formations through the cooperation of the inner and outer power heads 4; for general terrain, one of the power heads can be selected separately for construction operations according to the rock formation conditions. The dual-power head drilling rig improved by the present invention can realize dual-power head following pipe drilling and can also select one of the single power heads for drilling, and can be flexibly adjusted according to the working conditions.

[0041] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A dual power head installation 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 faces of corresponding outer masts; Two external lifting cylinders, used to drive the external power head to move up and down; An external power head is slidably connected to the track plate through a sliding frame, and is used to connect the casing and realize rock crushing drilling under the action of the external lifting cylinder; The telescopic ends of the external lifting oil cylinders respectively pass through the corresponding sliding frames from top to bottom, and the cylinder barrels thereof are connected to the end surfaces of the sliding frames close to the mast operating platform, and the telescopic ends thereof are connected to the mast operating platform through the supports; Two inner lifting cylinders are respectively arranged in the corresponding outer masts, and the two telescopic ends thereof are connected to the top of the inner mast through mast connectors; The inner power head can be slidably arranged on the front side of the inner mast, and is used to connect the drill pipe and lift or press down under the action of the inner lifting cylinder to achieve drilling or pulling out; and the outer power head and the inner power head are coaxially arranged up and down.

2. A dual power head installation structure according to claim 1, characterized in that: The dual power head installation structure also includes an inner power head follower structure, which includes a steel wire rope, a pulley block arranged on the mast connecting member, and a steel wire rope fixing seat arranged on the back of the outer mast. One end of the steel 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 steel wire rope fixing seat.

3. A dual power head installation structure according to claim 1 or 2, characterized in that: The dual power head installation structure also includes a hydraulic control system, which includes a main engine and an auxiliary engine arranged 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 and lowering of the outer power head.

4. A dual power head installation structure according to claim 1 or 2, characterized in that: The internal power head comprises an internal power head body and a track pulley arranged on the back side of the internal power head body; Correspondingly, inner slide rails matching the track pulley are respectively provided on both sides of the front side of the inner mast, and the track pulley is correspondingly matched and clamped on the slide rails to achieve slidable connection.

5. A dual power head installation structure according to claim 4, characterized in that: Guide rollers are respectively arranged on both side surfaces of the inner mast, and correspondingly, outer slide rails are respectively arranged on the corresponding side surfaces of the two outer masts, and the guide rollers are matched and mounted on the outer slide rails to realize slidable connection.

6. A dual power head installation structure according to claim 1 or 2, characterized in that: The external power head comprises an external power head body and a connecting plate arranged on one side of the external power head body; The external power head is connected to the sliding frame through the connecting plate.

7. A dual power head installation structure according to claim 1 or 2, characterized in that: The sliding frame includes a support frame, two track clamps and two clamp connectors, the track clamps are arranged on both sides of the support frame through the clamp connectors, and the two track clamps are symmetrically arranged about the center of the support frame, so that the sliding frame can be slidably mounted on the track plate; The cross section of the track clamp is L-shaped.

8. A dual power head installation structure according to claim 7, characterized in that: The support frame includes a bottom plate, two side plates vertically arranged on the bottom plate, and a cover plate; The two side plates are arranged on the bottom plate in parallel with each other, and the cover plate is arranged on the upper ends of the two side plates and forms a mounting through hole for the outer lifting cylinder to pass through; It also includes a cylinder mounting plate, which is blocked at one end of the mounting through hole and is used for fixed installation with the cylinder of the external lifting cylinder.

9. A drilling rig, characterized in that: It comprises a drilling rig body and a dual power head mounting structure as described in any one of claims 1 to 8 arranged on the drilling rig body.

10. A method for controlling a drilling rig according to claim 9, characterized in that: The steps include: S1. When dual power heads are required for drilling with pipes, the casing is connected to the outer power head, the drill rod is connected to the inner power head, and the drill rod passes through the casing from top to bottom: S11. When encountering loose and super-complex formations, the drilling speeds of the inner power head and the outer power head are adjusted so that the drill bit of the drill pipe is located inside the casing and the end face of the drill bit is higher than the casing shoe of the casing, the casing is drilled in front and the drill bit follows, and a safety cavity is formed between the drill pipe and the casing; S12. When encountering hard formations, the drilling speeds of the inner power head and the outer power head are adjusted so that the drill bit of the drill pipe extends out of the casing and the end face of the drill bit 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, it is only necessary to 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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