Large-displacement horizontal well while-drilling axial pressurization reaming assembly

Abstract

The invention relates to the technical field of well drilling, in particular to a large-displacement horizontal well while-drilling axial pressurization reaming assembly which comprises a positioning cylinder, a positioning ring fixedly sleeves the middle section of the outer portion of the positioning cylinder, conical ground rods are arranged on frames on the two sides of the positioning ring in a penetrating mode, and a movable disc is slidably connected to the middle section of the inner portion of the positioning cylinder. A first air cylinder is arranged between the top end of the movable disc and the inner wall of the top of the positioning barrel through a push rod, a first motor is arranged at the bottom of the movable disc, and a limiting barrel is arranged at the bottom output end of the first motor; according to the reaming device, adjustment can be conducted according to the drilling size requirement so that the reaming device can adapt to exploitation of various oil wells, after drilling reaming is completed, the well wall in the reaming area can be trimmed to keep the well wall flat so that the quality of the well wall after reaming can be further improved, meanwhile, drilling components can be self-cleaned so that continuous use can be achieved, and the drilling efficiency can be improved. And the while-drilling reaming efficiency of the oil well is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of drilling, in particular to an axial pressure-boosting reaming assembly for a large-displacement horizontal well while drilling. Background Art

[0002] A horizontal well is a special type of oil well designed to increase the exposed area in underground oil and gas formations, thereby increasing the oil well production and reservoir recovery rate. The well inclination angle reaches or approaches 90°, and the wellbore is drilled in a horizontal direction for a certain length.

[0003] Hole expansion while drilling is a drilling technology that uses hole expansion tools and conventional drill bit procedures to expand the wellbore while drilling. With the continuous development and improvement of drilling technology, hole expansion while drilling is to expand the wellbore to the required wellbore size while drilling, reducing the construction time of single hole expansion; For example, the hole-reaming drill bit disclosed in patent document CN207686608U performs three-stage drilling through pilot hole section, pre-reaming section and final reaming section, and each drilling gradually expands the wellbore. It is worth noting that since the blade structure used for drilling in the above device is relatively fixed, it is difficult to adapt to the requirements of various drilling sizes, and it is still easy to reduce the hole-reaming efficiency while drilling; At the same time, after the drill bit components drill deep into the oil well, a small amount of waste soil or gravel is likely to remain on the inner wall of the oil well after hole expansion, causing the well wall to become uneven, resulting in deviations in the inner diameter of the wellbore and affecting the subsequent installation and insertion of the oil pipe, greatly reducing the quality of the well wall and the efficiency of hole expansion while drilling.

[0004] In view of the technical defects in this aspect, a solution is now proposed. Summary of the invention

[0005] The purpose of the present invention is not only to be able to adjust according to the drilling size requirements so as to adapt to the exploitation of various oil wells, but also to be able to trim the well wall in the reaming area after the drilling and reaming is completed to keep the well wall flat, so as to further improve the quality of the well wall after reaming, and at the same time, the drilling components can be self-cleaned for continuous use, effectively improving the efficiency of reaming while drilling the oil well.

[0006] The object of the present invention can be achieved by the following technical scheme: an axial booster reaming assembly for a large displacement horizontal well while drilling, comprising a positioning cylinder, a positioning ring is fixedly sleeved at the middle section of the outer portion of the positioning cylinder, cone ground rods are penetrated at the frames on both sides of the positioning ring, a movable disk is slidably connected at the middle section of the inner portion of the positioning cylinder, and a cylinder is arranged between the top of the movable disk and the inner wall of the top of the positioning cylinder through a push rod; The bottom of the movable disk is provided with a motor 1, and the bottom output end of the motor 1 is provided with a limiting cylinder, the bottom cylinder mouth of the limiting cylinder is threadedly connected with a convex cylinder cover, and the bottom of the convex cylinder cover is fixedly connected with a drill disk through a connecting rod, and an annular drill frame is respectively penetrated through the middle opening grooves of the inner walls on both sides of the limiting cylinder, and the annular drill frame is provided with corrugated grooves at equal distances near the frame wall of the opening groove, and a distance adjustment mechanism is commonly provided inside the limiting cylinder and between the two groups of annular drill frames; Among them, the distance adjustment mechanism includes a fixed frame with an inverted concave structure, and the fixed frame is fixedly installed in the middle section inside the limiting cylinder. The inner wall of the rear end of the fixed frame is provided with sliding grooves near the two ends of the bottom. The two sets of sliding grooves are respectively fixedly connected with long plates through sliding rods connected by sliding connections.

[0007] Furthermore, the opening grooves on both sides of the limit cylinder are of a structure that is narrow on the outside and wide on the inside, and the beveled surfaces of the upper and lower inner walls of the opening groove are symmetrically penetrated by retaining plates, and the opposite surfaces of the two retaining plates corresponding to the upper and lower sides on the same side are beveled surfaces, and a damping spring coil is commonly arranged between the ends of the two plates that are away from each other and the corresponding inner walls of the through grooves.

[0008] Furthermore, the distance adjustment mechanism also includes a second cylinder, which is fixedly installed at the center of the top surface of the limiting cylinder, and the bottom of the second cylinder is fixedly connected to a push plate through a push rod, and the push plate is provided with inclined grooves at the upper and lower ends and on both sides, and the left and right groups of the inclined grooves are symmetrically arranged, and the two inclined grooves near the upper end are jointly provided with a trimming assembly, and the rear ends of the two groups of sliding rods extend to the inside of the two inclined grooves near the bottom end respectively.

[0009] Furthermore, the two sides of the front end of the long board are fixedly connected with auxiliary rotating gears and cleaning rollers through rotating rods that penetrate the connection, and the frame body on one side of the annular drill frame is sleeved in the interval between adjacent auxiliary rotating gears and cleaning rollers, and the auxiliary rotating gear is meshed with the tooth groove group arranged on the inner ring surface of the annular drill frame.

[0010] Furthermore, the auxiliary rotating gear and the rear end rotating rod of the annular drill frame respectively extend to the rear end of the long board and are fixedly installed with a transmission wheel, a transmission belt is sleeved between two adjacent groups of the transmission wheels, and a driven gear is fixedly installed at the rear end of one group of the transmission wheels.

[0011] Furthermore, a second motor is arranged at the inner center of the front end of the fixed frame, and the rear output shaft of the second motor extends to the rear ends of the two adjacent groups of long boards and is fixedly installed with a driving gear, which is located between the two adjacent groups of driven gears.

[0012] Furthermore, the trimming assembly includes a long cylinder, which is fixedly installed inside the limiting cylinder through a mounting rod and is located at the upper end of the fixed frame, and the interior of the long cylinder is connected to T-shaped push cylinders at both ends. The two sets of T-shaped push cylinders are flat at one end away from each other and penetrate the corresponding limiting cylinder wall.

[0013] Furthermore, a round shaft is fixedly installed on the rear end face of the T-shaped push cylinder and located outside the long cylinder, and the round shaft is slidably connected to the corresponding inclined groove. A butt ring is fixedly sleeved on the outside of the T-shaped push cylinder and a damping spring coil 2 is jointly arranged between the butt ring and the corresponding limit cylinder outside the T-shaped push cylinder.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention cooperates with components such as a stopper barrel, a drill plate, an annular drill frame and a distance adjustment mechanism, firstly uses the drill plate to drill a hole inside the oil well, and then uses the distance adjustment mechanism to push two groups of annular drill frames to the outside of the stopper barrel, and the two groups of annular drill frames are pushed to the outside of the stopper barrel at the same time to form a new drilling tool, and the distance between the outer walls of the two is greater than the diameter of the drill plate, and then the inside of the oil well is further expanded by rotating the stopper barrel to meet the needs of various drilling and hole expansion; At the same time, the auxiliary gear is engaged with the tooth groove group on the inner wall of the annular drill frame to realize the self-rotation of the annular drill frame, and the decontamination roller on the side wall rotates to facilitate the timely removal of sludge or gravel retained on the outside of the annular drill frame, keeping the surface of the annular drill frame clean and facilitating subsequent continuous drilling; The present invention is also assisted by the setting of a correction component. The push plate sinks downward and moves relative to the trimming component. The two groups of inclined grooves close to the top layer move relative to the two groups of circular shafts respectively. The two groups of T-type push cylinders move away from each other. The flat ends of the two groups of T-type push cylinders extend to the outside of the limiting cylinders respectively and stick to the well wall after the diameter expansion. With the rotation of the limiting cylinder, the flat ends of the two groups of T-type push cylinders rotate accordingly and further scrape the excess soil residue on the well wall, thereby keeping the well wall flat, reducing the deviation of the inner diameter of the wellbore and the impact on the installation and insertion of the subsequent oil pipe, and further improving the quality of well water expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional view of the combination of the limit cylinder and the drill disc of the present invention; Figure 3 It is a top sectional view of the limiting cylinder of the present invention; Figure 4 A half-section view of the limiting cylinder of the present invention; Figure 5 It is a partial cross-sectional view of the limiting cylinder of the present invention; Figure 6 It is a three-dimensional schematic diagram of the structure of the limiting cylinder part of the present invention; Figure 7 It is a three-dimensional schematic diagram of the trimming assembly of the present invention.

[0017] In the figure: 1. positioning cylinder; 2. movable plate; 3. cylinder 1; 4. motor 1; 5. limiting cylinder; 501. stopper; 502. damping spring coil 1; 6. drill plate; 7. annular drill frame; 8. distance adjustment mechanism; 81. fixed frame; 82. slide bar; 83. long plate; 84. cylinder 2; 85. push plate; 86. inclined groove; 87. auxiliary gear; 88. decontamination roller; 89. transmission wheel; 810. driven gear; 811. motor 2; 812. driving gear; 9. finishing assembly; 91. long cylinder; 92. T-type push cylinder; 93. round shaft; 94. stopper; 95. damping spring coil 2. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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.

[0019] Example 1: Please refer to Figure 1 - Figure 7 As shown, a large displacement horizontal well drilling axial booster reaming assembly includes a positioning cylinder 1, a positioning ring is fixedly sleeved at the middle section of the outer portion of the positioning cylinder 1, cone rods are penetrated at the frames on both sides of the positioning ring, a movable disk 2 is slidably connected at the middle section of the inner portion of the positioning cylinder 1, and a cylinder 3 is arranged between the top of the movable disk 2 and the inner wall of the top of the positioning cylinder 1 through a push rod; A motor 4 is arranged at the bottom of the movable disk 2, and a limiting cylinder 5 is arranged at the output end of the bottom of the motor 4. The opening grooves on both sides of the limiting cylinder 5 are arranged in a structure that is narrow outside and wide inside. The chamfered surfaces of the upper and lower inner walls of the opening groove are symmetrically penetrated with abutment pieces 501, and the opposite surfaces of the two corresponding abutment pieces 501 on the same side are arranged in a chamfered surface, and a damping spring coil 502 is arranged between the ends of the two abutment pieces 501 away from each other and the corresponding inner walls of the through grooves. The bottom of the limiting cylinder 5 is threadedly connected with a convex cylinder cover, and the bottom of the convex cylinder cover is fixedly connected with a drill plate 6 through a connecting rod. The middle opening grooves of the inner walls on both sides of the limiting cylinder 5 are respectively penetrated by an annular drill frame 7, and the frame wall of the annular drill frame 7 close to the opening groove is equidistantly provided with corrugated grooves; Move the positioning cylinder 1 to the wellbore of the oil well, and make the drill plate 6 correspond to the wellbore up and down. At the same time, insert two sets of cone rods into the two sides of the wellbore mouth respectively to realize the positioning of the positioning cylinder 1. Then, start the cylinder 3 and use the push rod to push the movable plate 2, the motor 4, the limit cylinder 5, and the drill plate 6 to sink and insert into the wellbore at the same time. At the same time, the starter motor 4 drives the limit cylinder 5 and the drill plate 6 to rotate by using the output shaft, and the drill plate 6 inserted into the wellbore starts to rotate and drill holes to open up the inner cavity of the oil well. After the drill plate 6 is inserted into the well to a certain depth, the distance adjustment mechanism 8 is used to push the two sets of annular drill frames 7 out of the limit cylinder 5, so that after the drilling is completed, the two sets of annular drill frames 7 rotate with the limit cylinder 5, forcing the inner diameter of the oil well to be further expanded on the basis of the originally drilled oil well; A distance adjustment mechanism 8 is provided inside the limiting cylinder 5 and between the two groups of annular drill frames 7, wherein the distance adjustment mechanism 8 comprises a fixed frame 81 of an inverted concave structure, and the fixed frame 81 is fixedly installed at the middle section inside the limiting cylinder 5, and a slide groove is provided at the inner wall of the rear end of the fixed frame 81 near the two ends of the bottom, and a long plate 83 is fixedly connected to the two groups of slide grooves through a sliding rod 82 connected in a sliding manner, and an auxiliary rotating gear 87 and a decontamination roller 88 are fixedly connected to the two sides of the front end of the long plate 83 through a rotating rod connected through the connection; One side of the annular drill frame 7 is sleeved at the interval between the adjacent auxiliary rotating gear 87 and the decontamination roller 88, and the auxiliary rotating gear 87 is meshed with the tooth groove set on the inner ring surface of the annular drill frame 7. The distance adjustment mechanism 8 also includes a second cylinder 84, which is fixedly installed at the center of the top surface of the limit cylinder 5, and the bottom of the second cylinder 84 is fixedly connected to a push plate 85 through a push rod. The push plate 85 is provided with inclined grooves 86 at the upper and lower ends and at both sides. The left and right groups of inclined grooves 86 are symmetrically arranged, and the two inclined grooves 86 near the upper end are jointly provided with a trimming assembly 9. The rear ends of the two groups of slide bars 82 extend to the inside of the two inclined grooves 86 near the bottom end respectively; After the initial drilling is completed, the water well is further expanded. First, the spacing between the two sets of annular drill frames 7 is adjusted according to the diameter of the water well expansion hole, that is, the length of the annular drill frame 7 extending to the outside of the limit tube 5; The operation process of the distance adjustment mechanism 8 includes: starting the second cylinder 84 to use the push rod to push the push plate 85 to sink, thereby forcing the two groups of inclined grooves 86 near the lower end to move relative to the two groups of sliding rods 82 respectively, and using the inner wall of the top of the inclined groove 86 to press the sliding rod 82, forcing the two groups of sliding rods 82 to move laterally along the corresponding transverse groove at the same time, and the two groups of sliding rods 82 and the long plate 83 at the front end are separated from each other, and the two adjacent groups of auxiliary gears 87 and the decontamination roller 88 are used to clamp and push the annular drill frame 7 to move outward. The two groups of annular drill frames 7 are pushed to the outside of the limit tube 5 at the same time to form a new drilling tool, and the distance between the outer walls of the two is greater than the diameter of the drill plate 6, and then the inside of the oil well is further expanded by rotating the limit tube 5, so that the drilling tool can be adjusted according to the needs of eye expansion.

[0020] Example 2: Please refer to Figure 3 - Figure 5As shown, the auxiliary rotating gear 87 and the rear end rotating rod of the annular drill frame 7 extend to the rear end of the long plate 83 and are fixedly installed with a transmission wheel 89, and a transmission belt is sleeved between two adjacent sets of transmission wheels 89. A driven gear 810 is fixedly installed at the rear end of one set of transmission wheels 89, and a second motor 811 is arranged at the inner center of the front end of the fixed frame 81, and the rear end output shaft of the second motor 811 extends to the rear ends of the two adjacent sets of long plates 83 and is fixedly installed with a driving gear 812, and the driving gear 812 is located between the two adjacent sets of driven gears 810; After the hole is expanded, the push plate 85 is pulled upward by the air cylinder 84 to reset, and the two groups of inclined grooves 86 near the bottom move relative to the slide bar 82 again, and the two groups of slide bars 82 are pressed against each other by the bottom of the inclined grooves 86, and the corresponding long plates 83, auxiliary gears 87 and decontamination rollers 88 are pulled to move at the same time. At this time, the annular drill frame 7 moves back to the inside of the limit tube 5; Similarly, the two sets of driven gears 810 are also close to each other and mesh with the driving gear 812 respectively, and the second motor 811 is started to drive the driving gear 812 to rotate, and the two sets of driven gears 810, the corresponding transmission wheels 89 and the decontamination roller 88 rotate in opposite directions, and the self-rotating transmission wheel 89 drives another set of transmission wheels 89 and the corresponding auxiliary rotating gear 87 at the adjacent position to rotate synchronously under the action of the transmission belt, and the auxiliary rotating gear 87 is meshed with the tooth groove group on the inner wall of the annular drill frame 7 to realize the self-rotation of the annular drill frame 7, and cooperate with the rotation of the decontamination roller 88 at the side wall, so as to facilitate the timely removal of mud or gravel retained on the outside of the annular drill frame 7, keep the surface of the annular drill frame 7 clean and facilitate the subsequent continuous drilling; It is worth noting that the gravel and soil debris generated during the scraping and cleaning process of the two sets of annular drill frames 7 are retained on the inner wall at the bottom of the limiting cylinder 5. Therefore, after the eye is reamed and self-cleaned, the convex cylinder cover is twisted to force the bottom of the limiting cylinder 5 to be opened, thereby facilitating the discharge of the gravel and soil debris.

[0021] Example 3: Please refer to Figure 4 and Figure 7 As shown, the trimming assembly 9 includes a long cylinder 91, which is fixedly installed inside the limiting cylinder 5 and located at the upper end of the fixed frame 81 through a mounting rod, and the inside of the long cylinder 91 is connected to T-type push cylinders 92 at both ends, and the ends of the two groups of T-type push cylinders 92 away from each other are flat and penetrate the corresponding cylinder wall of the limiting cylinder 5, and a round shaft 93 is fixedly installed on the rear end surface of the T-type push cylinder 92 and located outside the long cylinder 91, and the round shaft 93 is slidably connected to the corresponding inclined groove 86, and a butt ring 94 is fixedly sleeved on the outside of the T-type push cylinder 92 at one side of the round shaft 93, and a damping spring coil 95 is commonly provided between the butt ring 94 and the corresponding inside of the limiting cylinder 5 on the outside of the T-type push cylinder 92; As the push plate 85 sinks downward and moves relative to the trimming assembly 9, the two groups of inclined grooves 86 near the top layer move relative to the two groups of round shafts 93 respectively, and the inner wall of the top of the inclined groove 86 is used to force the round shaft 93 to move linearly to one side. The two groups of round shafts 93 move away from each other, and the corresponding two groups of T-shaped push cylinders 92 also move away from each other. The ring 94 moves toward the inner wall of the corresponding limit cylinder 5 and causes the damping spring coil 2 95 to be compressed. The flat ends of the two groups of T-shaped push cylinders 92 extend to the outside of the limit cylinder 5 respectively and stick to the well wall after the diameter is expanded. As the stopper 5 rotates, the flat ends of the two sets of T-shaped push cylinders 92 rotate accordingly and further scrape the excess soil debris on the well wall, thereby keeping the well wall flat, reducing the deviation of the wellbore inner diameter and the impact on the installation and insertion of the subsequent oil pipe, and further improving the quality of well water expansion; After the trimming is completed, as the limiting cylinder 5 is pulled out, the cylinder 2 84 is used to pull the push plate 85 to rise, and the two groups of inclined grooves 86 near the top layer move relative to the two groups of circular shafts 93 again, and the inner wall at the bottom of the inclined groove 86 is used to force the circular shaft 93 to move linearly to one side, and the two groups of circular shafts 93 approach each other, and the corresponding two groups of T-shaped push cylinders 92 also approach each other and are collected into the limiting cylinder 5.

[0022] Working principle: When the present invention is used, the positioning cylinder 1 is moved to the wellbore of the oil well, and the drill plate 6 corresponds to the wellbore up and down. At the same time, two sets of cone rods are respectively inserted at the positions on both sides of the wellbore mouth to realize the positioning of the positioning cylinder 1. Then, the cylinder 3 is started to use the push rod to push the movable plate 2, the motor 4, the limit cylinder 5, and the drill plate 6 to sink at the same time and insert into the wellbore. At the same time, the motor 4 is started to use the output shaft to drive the limit cylinder 5 and the drill plate 6 to rotate, and the drill plate 6 inserted into the wellbore starts to rotate and drill holes to open up the inner cavity of the oil well. The two groups of annular drill frames 7 are pushed out to the outside of the limiting cylinder 5 by using the distance adjustment mechanism 8, and the air cylinder 2 84 is started to push the push plate 85 to settle, thereby forcing the two groups of inclined grooves 86 near the lower end to move relative to the two groups of slide bars 82 respectively, and the inner wall of the top of the inclined groove 86 is used to press the slide bar 82, forcing the two groups of slide bars 82 to move laterally along the corresponding transverse groove at the same time, and the two groups of slide bars 82 and the long plate 83 at the front end thereof are separated from each other, and the annular drill frames 7 are pushed outward by the two adjacent groups of auxiliary gears 87 and the decontamination roller 88, and the two groups of annular drill frames 7 are pushed to the outside of the limiting cylinder 5 at the same time to form a new drilling tool, and the distance between the outer walls of the two groups is greater than the diameter of the drill plate 6, and then the inside of the oil well is further expanded by the rotation of the limiting cylinder 5; At the same time, the push plate 85 sinks downward and moves relative to the trimming assembly 9, the two groups of inclined grooves 86 near the top layer move relative to the two groups of circular shafts 93 respectively, and the corresponding two groups of T-type push cylinders 92 also move away from each other, the ring 94 moves toward the inner wall of the corresponding limit cylinder 5 and causes the damping spring coil 2 95 to be compressed, and the flat ends of the two groups of T-type push cylinders 92 extend to the outside of the limit cylinder 5 respectively and stick to the well wall after the diameter is expanded. With the rotation of the limit cylinder 5, the flat ends of the two groups of T-type push cylinders 92 rotate accordingly and further scrape the excess soil residue on the well wall to keep the well wall flat; After the hole is expanded, the push plate 85 is pulled upward by the air cylinder 84 to reset, and the two groups of inclined grooves 86 near the bottom move relative to the slide bar 82 again, and the two groups of slide bars 82 are pressed against each other by the bottom of the inclined grooves 86, and the corresponding long plates 83, auxiliary gears 87 and decontamination rollers 88 are pulled to move at the same time. At this time, the annular drill frame 7 moves back to the inside of the limit tube 5; In addition, the two sets of driven gears 810 are also close to each other and mesh with the driving gear 812 respectively. The starting motor 811 drives the driving gear 812 to rotate, and the two sets of driven gears 810, the corresponding transmission wheels 89 and the decontamination roller 88 rotate in opposite directions. The self-rotating transmission wheel 89 drives another set of transmission wheels 89 and the corresponding auxiliary rotating gear 87 in the adjacent position to rotate synchronously under the action of the transmission belt, and the auxiliary rotating gear 87 is meshed with the tooth groove group on the inner wall of the annular drill frame 7 to realize the self-rotation of the annular drill frame 7, and cooperate with the rotation of the decontamination roller 88 at the side wall, so as to facilitate the timely removal of sludge or gravel retained on the outside of the annular drill frame 7.

[0023] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An axial pressure reaming assembly for a large-displacement horizontal well while drilling, comprising a positioning cylinder (1), characterized in that: A positioning ring is fixedly sleeved at the middle section of the outside of the positioning cylinder (1), and conical ground rods are provided through the frames on both sides of the positioning ring. A movable disk (2) is slidably connected at the middle section of the inside of the positioning cylinder (1), and a cylinder (3) is provided between the top of the movable disk (2) and the inner wall of the top of the positioning cylinder (1) via a push rod. The bottom of the movable disk (2) is provided with a motor 1 (4), and the output end of the bottom of the motor 1 (4) is provided with a limiting cylinder (5), the bottom of the limiting cylinder (5) is threadedly connected with a convex cylinder cover, and the bottom of the convex cylinder cover is fixedly connected to a drill disk (6) through a connecting rod, and an annular drill frame (7) is respectively penetrated at the middle opening groove of the inner wall on both sides of the limiting cylinder (5), and the annular drill frame (7) is provided with corrugated grooves at equal distances at the frame wall near the opening groove, and a distance adjustment mechanism (8) is provided inside the limiting cylinder (5) and between the two groups of annular drill frames (7); The distance adjustment mechanism (8) comprises a fixed frame (81) with an inverted concave structure, and the fixed frame (81) is fixedly mounted at the middle section inside the limiting cylinder (5), and a sliding groove is provided on the inner wall of the rear end of the fixed frame (81) near both ends of the bottom, and a long plate (83) is fixedly connected inside the two sets of sliding grooves via sliding rods (82) connected in a sliding manner.

2. The axial pressure expansion assembly for extended-displacement horizontal wells while drilling according to claim 1, characterized in that: The opening grooves on both sides of the limiting cylinder (5) are arranged in a structure that is narrow on the outside and wide on the inside. The upper and lower inner walls of the opening groove are symmetrically penetrated by abutment plates (501). The opposite surfaces of the two corresponding abutment plates (501) on the same side are arranged in a beveled surface, and a damping spring coil (502) is commonly arranged between the ends of the two abutment plates (501) away from each other and the corresponding inner wall of the through groove.

3. The axial pressure expansion assembly for extended-displacement horizontal wells while drilling according to claim 1, characterized in that: The distance adjustment mechanism (8) further comprises a second cylinder (84), wherein the second cylinder (84) is fixedly mounted at the center of the top surface of the limiting cylinder (5), and a push plate (85) is fixedly connected to the bottom of the second cylinder (84) via a push rod, and inclined grooves (86) are arranged at the upper and lower ends and at both sides of the push plate (85), and the left and right groups of inclined grooves (86) are symmetrically arranged, and the two inclined grooves (86) near the upper end are jointly provided with a trimming assembly (9), and the rear ends of the two groups of sliding rods (82) extend to the inside of the two inclined grooves (86) near the bottom end, respectively.

4. The axial pressure expansion assembly for extended-displacement horizontal wells while drilling according to claim 1, characterized in that: The two sides of the front end of the long plate (83) are respectively fixedly connected to an auxiliary rotating gear (87) and a decontamination roller (88) via rotating rods that penetrate the connection, and a frame body on one side of the annular drill frame (7) is sleeved at the interval between adjacent auxiliary rotating gears (87) and decontamination rollers (88), and the auxiliary rotating gear (87) is meshed with a tooth groove group provided on the inner ring surface of the annular drill frame (7).

5. The axial pressure expansion assembly for extended-displacement horizontal wells while drilling according to claim 4, characterized in that: The auxiliary rotating gear (87) and the rear end rotating rod of the annular drill frame (7) respectively extend to the rear end of the long plate (83) and are fixedly mounted with a transmission wheel (89); a transmission belt is sleeved between two adjacent groups of the transmission wheels (89); and a driven gear (810) is fixedly mounted at the rear end of one group of the transmission wheels (89).

6. The axial pressure expansion assembly for extended-displacement horizontal wells while drilling according to claim 1, characterized in that: A second motor (811) is arranged at the center of the front end of the fixed frame (81), and the output shaft at the rear end of the second motor (811) extends to the rear ends of two adjacent groups of long plates (83) and is fixedly mounted with a driving gear (812), the driving gear (812) being located between two adjacent groups of driven gears (810).

7. The axial pressure expansion assembly for extended-displacement horizontal wells while drilling according to claim 3, characterized in that: The trimming assembly (9) comprises a long tube (91), the long tube (91) being fixedly mounted inside the limiting tube (5) via a mounting rod and being located at the upper end of the fixing frame (81), and the inside of the long tube (91) is connected to T-shaped push tubes (92) at both ends, and the ends of the two sets of T-shaped push tubes (92) away from each other are flat and penetrate the wall of the corresponding limiting tube (5).

8. The axial pressure expansion assembly for extended-displacement horizontal wells while drilling according to claim 7, characterized in that: A round shaft (93) is fixedly mounted on the rear end surface of the T-shaped push cylinder (92) and located outside the long cylinder (91), and the round shaft (93) is slidably connected to the inside of the corresponding inclined groove (86). A retaining ring (94) is fixedly sleeved on the outside of the T-shaped push cylinder (92) and located on one side of the round shaft (93). A damping spring coil 2 (95) is commonly provided between the retaining ring (94) and the inside of the corresponding limit cylinder (5) on the outside of the T-shaped push cylinder (92).

Images