CN220036589U - Integrated tubular column - Google Patents

Abstract

The utility model belongs to the technical field of oilfield workover tools, and particularly relates to an integrated tubular column. The integrated tubular column comprises a barrel and scraping sheets arranged on the circumferential direction of the barrel, a piston hole is formed in the radial direction of the barrel, a piston used for driving the scraping sheets is arranged in the piston hole, a central tube is arranged in the barrel, a gap is formed between the central tube and the barrel, a ball seat and a liquid outlet hole are arranged at the lower end of the central tube, the ball seat is connected with the barrel through a shear pin and seals the liquid outlet hole, and the liquid outlet hole is communicated with the piston hole through the gap; the barrel is connected with a flushing drill bit, and the flushing drill bit is provided with a flushing structure. The piston is arranged to drive the scraping piece, so that the scraping piece can adapt to the use requirements of shafts with different inner diameters; the device is matched with a flushing structure, and the scraped residual ash is taken out of the shaft by utilizing high-pressure liquid flow when the ash plug is drilled, so that the scraping operation of the drill plug is completed through one pipe column, and the cleaning of the shaft is further realized.

Description

Integrated tubular column

Technical Field

The utility model belongs to the technical field of oilfield workover tools, and particularly relates to an integrated tubular column.

Background

In oil exploitation, well repair is often accompanied, and if the underground situation is complex, procedures such as drilling, well dredging, scraping and the like are often required to be carried out in the well repair. The well dredging operation is to eliminate sundries, burrs and the like on the inner wall of the casing, so that the inside of the casing is unobstructed, the artificial bottom hole depth is conveniently verified, and the safe and smooth working procedures such as perforation and the like are ensured. Scraping operation is used for removing dead oil, plugging and residual cement, plugging agent, hard wax, salt scale, perforation blasthole burrs and the like on the inner wall of the sleeve. The drilling and plugging operation is mainly used for drilling and removing ash plugs left when the oil-water well is plugged, plugged layers are extruded and plugged.

The currently used small repair drill ash plug drill bit is mainly a single-scraper or three-scraper drill bit, and the main problems existing when the two drill bits drill ash plugs are that: the water outlet has large flow area when the drill bit drills the ash plug, and has no auxiliary impact effect on the ash plug; under the condition of increasing the pressurization, the torque becomes larger, and the effect of quickly drilling the ash plug cannot be achieved; but the pressurizing is small, the torque is small, the drilling and plugging ruler is slow, and the working efficiency is affected. In addition, after the ash drilling plug is finished, operations such as scraping and the like are needed, and each procedure needs to be performed by a plurality of pipe columns to finish specific operation measures, so that a plurality of working procedures are needed, and the construction period is long.

The Chinese patent of the utility model with the authority of CN205445551U and the authority of 2016 8 month 10 discloses a three-in-one open well scraping tool, which comprises a barrel, wherein the upper end and the lower end of the barrel are respectively connected with an upper joint and a lower joint, a central pipe is sleeved in the barrel, a piston matched with the inner wall of the barrel is integrally arranged at the upper end of the central pipe, a plurality of scraping pieces are circumferentially staggered on the barrel at the lower side of the piston, knife holes which are convenient for the scraping pieces to radially stretch out and draw back are arranged on the barrel wall, axial knife grooves are respectively arranged at two sides of the scraping pieces, guide grooves which are mutually clamped with the knife grooves are respectively correspondingly arranged on the central pipe, a gap which is convenient for the scraping pieces to radially stretch out and draw back is arranged between the knife grooves and the guide grooves, a pressure spring is also arranged between the scraping pieces and the central pipe, and a bevel which is convenient for pushing the scraping pieces to stretch out and draw back axially is arranged on the wall of the central pipe which is abutted by the pressure spring. According to analysis, the scraping tool uses a plurality of scraping sheets supported by springs to scrape the inner wall of the sleeve, but the outer diameters of the scraping sheets are fixed, and no matter how the springs are compressed, the scraping tool can only scrape a whole circle for the inner diameter of the sleeve which is equal to the outer diameter of the scraping sheets, so that the universality is not enough; in addition, the scraping tool cannot complete the drilling and plugging operation, and well repair operation still needs to be completed by matching with other working procedures.

The Chinese patent utility model with the authority bulletin number of CN216277765U and the authority bulletin date of 2022, 4 and 12 discloses a drill bit for underground drilling and grinding, which comprises a bit body, wherein the bit body comprises an upper joint section, a drift diameter gauge body section, a scraping section and a milling bit section; the bottom of the milling bit section is provided with a plurality of drilling tool bits; the scraping section is provided with side grinding bodies in a protruding mode on the outer side face of the scraping section, and the side grinding bodies are distributed at least two at intervals along the circumferential direction of the drill bit body and are used for completing scraping operation in the rotation process of the drill bit body; the outer diameter sizes of all the side grinding bodies are consistent to form a scraping circumferential surface; the drift diameter gauge body section has an drift diameter outer circumferential surface which is a circumferential surface having a radial dimension equal to the scraping outer circumferential surface. The drill bit is not only provided with a milling drill bit section, but also correspondingly provided with a scraping section and a drift diameter gauge body section, and the scraping of the underground sleeve is completed together during drilling and grinding, the drift diameter detection of the underground sleeve is completed simultaneously, and the drilling and grinding, scraping and drift diameter detection can be completed by putting the pipe column into one time. The analysis shows that the outer diameter of the drill bit for underground drilling and grinding is fixed, and the drill bit is only suitable for the inner diameter of a casing pipe which is equal to the outer diameter of the casing pipe, and has insufficient universality.

Disclosure of Invention

The utility model aims to provide an integrated pipe column so as to solve the problem of poor universality of the conventional device.

In order to achieve the above purpose, the integrated pipe column of the utility model adopts the following technical scheme:

the integrated pipe column comprises a barrel and scraping sheets arranged on the circumferential direction of the barrel, wherein a piston hole is formed in the radial direction of the barrel, a piston used for driving the scraping sheets is arranged in the piston hole, a central pipe is arranged in the barrel, a gap is formed between the central pipe and the barrel, a ball seat and a liquid outlet hole are arranged at the lower end of the central pipe, the ball seat is connected with the barrel through a shear pin and seals the liquid outlet hole, and the liquid outlet hole is communicated with the piston hole through the gap; the barrel is connected with a flushing drill bit, and the flushing drill bit is provided with a flushing structure.

The beneficial effects of the technical scheme are that: according to the utility model, by improving the prior art, the piston is arranged in the radial direction of the cylinder, the annular space between the cylinder and the central tube is arranged, and the liquid outlet hole is arranged at the lower end of the central tube, so that after the setting of the ball seat is released, the liquid outlet hole is communicated with a gap between the central tube and the cylinder, and high-pressure well liquid enters the piston hole through the liquid outlet hole and the gap to push the piston to expand outwards in the radial direction so as to drive the scraping sheet to scrape a shaft, the scraping sheet can adapt to the use requirements of shafts with different inner diameters, and the universality of an integral tubular column is improved; the ash plug is drilled through arranging the flushing drill bit on the cylinder body, and the scraped residual ash is brought out of the shaft by utilizing high-pressure liquid flow when the ash plug is drilled through a flushing structure arranged by the drill bit.

Further, the end of the piston, which is far away from the scraping piece, is abutted against the inner wall of the central tube.

The beneficial effects of the technical scheme are that: this arrangement facilitates the radially outward expansion of the high pressure fluid driving piston entering through the central tube and barrel gap to drive the scraping blade to scrape the wellbore.

Further, a piston sealing ring is arranged on the wall of the piston hole.

The beneficial effects of the technical scheme are that: by the arrangement, the sealing performance of the piston and the piston hole in a matched manner can be effectively ensured, and therefore the stability of the pressurized driving of the piston is improved.

Further, a sealing structure is arranged between the cylinder body and the central tube, and the sealing structure is a sealing groove arranged on the inner wall of the cylinder body and a sealing ring arranged in the sealing groove.

The beneficial effects of the technical scheme are that: by the arrangement, the tightness between the cylinder body and the central tube can be effectively ensured, so that stable thrust is provided for pushing the piston.

Further, the center of the flushing bit is provided with a through-flow channel, the flushing structure comprises an injection hole and an eccentric hole which are arranged at one end of the flushing bit, and the injection hole and the eccentric hole are respectively communicated with the through-flow channel.

The beneficial effects of the technical scheme are that: by such an arrangement, the jet hole and the eccentric hole of the flushing structure are communicated with the through-flow channel, so that the scraped residual ash can be carried out of the shaft by utilizing high-pressure liquid flow during scraping.

Further, the central axis of the jet hole forms an included angle with the central axis of the scouring bit.

The beneficial effects of the technical scheme are that: by such arrangement, the high-pressure liquid can be ejected through the ejection hole to better flush the scraping residual ash in the moving direction of the drill bit.

Further, the eccentric holes are arranged along the radial direction of the scouring drill bit, and included angles among central axes of the eccentric holes are equal.

The beneficial effects of the technical scheme are that: by the arrangement, high-pressure liquid can be sprayed out through the eccentric holes to flush the scraped residual ash on the wall of the well barrel better.

Further, the washout drill includes a drill body extending along an axis, the drill body including a joint section, a drill section, and a scraping section connecting the drill section and the joint section; the joint section is connected with the lower joint of the cylinder body; the bottom of the drilling and grinding section is provided with a drilling and grinding drill bit, and the scraping section is provided with a reaming drill bit.

The beneficial effects of the technical scheme are that: the device is arranged, the drill of the ash plug is realized through the drill bit arranged at the drill grinding section, the reaming of the ash plug after the drill is opened is realized through the reaming bit arranged at the scraping section, and the cleaning of the ash plug is realized through the cooperation of the drill bit and the reaming bit.

Further, the face outer diameter of the reamer bit proximate the drill bit is smaller than the face outer diameter of the reamer bit distal the drill bit.

The beneficial effects of the technical scheme are that: by means of the arrangement, reaming of the drilled dust plugs is achieved through the reaming drills with different working face outer diameters, so that the efficiency of drilling the dust plugs and reaming can be effectively improved, and meanwhile loss of a single drill can be effectively reduced.

Further, the face outer diameter of the drill bit is no greater than the face outer diameter of a minimum face outer diameter set of reamer bits.

The beneficial effects of the technical scheme are that: the drilling and grinding drill bit is used for drilling the ash plug, the reaming drill bit is used for reaming the ash plug drilled by the drilling and grinding drill bit step by step, the scraping and well repairing are carried out by matching with the scraping piece, the drilling and grinding drill bit and the reaming drill bit are respectively used for carrying out different well repairing operations, and the multi-working procedures such as drilling plug, reaming and the like are completed through one pipe column, so that the efficiency of well repairing operation is improved.

Drawings

FIG. 1 is a schematic diagram of an integrated pipe column of the present utility model;

FIG. 2 is a schematic view of a scour drill of the present utility model;

FIG. 3 is a view in the A-A direction of FIG. 2;

fig. 4 is a B-B view of fig. 3.

In the figure: 1. an upper joint; 2. positioning a fixed block; 3. a first seal ring; 4. a second seal ring; 5. stabilizing nails; 6. a cylinder; 61. a first step; 7. a central tube; 8. a pressing plate screw; 9. an upper press plate; 10. a spring; 11. scraping piece, 12, piston seal ring; 13. a piston bore; 14. a piston; 15. a mounting groove; 16. a lower pressing plate; 17. a third seal ring; 18. a ball seat; 19. limiting shear pins; 20. a lower joint; 21. a liquid outlet hole; 22. flushing the drill bit; 221. a first reamer bit; 222. a second reamer bit; 223. drilling and grinding a drill bit; 224. an injection hole; 225. an eccentric hole; 226. and a through flow channel.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the utility model, i.e., the embodiments described are merely some, but not all, of the embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

It is noted that relational terms such as "first" and "second", and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" or the like does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The features and capabilities of the present utility model are described in further detail below in connection with the examples.

Example 1 of an integrated column in the present utility model:

as shown in fig. 1, the integrated pipe column of the present utility model mainly comprises an upper joint 1, a cylinder 6, a central pipe 7, a lower joint 20, a scraping piece 11 and a flushing bit 22.

The upper joint 1 is provided with internal threads at the upper and lower ends, the internal threads at the upper end are used for being connected with a tubular column, the internal threads at the lower end are used for being connected with a cylinder 6, and the upper joint 1 is fixed on the outer wall of the cylinder 6 through a stable nail 5 after being connected with the cylinder 6 through threads.

The upper end of the lower joint 20 is provided with internal threads, the lower end is provided with external threads, wherein the internal threads at the upper end are used for connecting the cylinder 6, the external threads at the lower end are connected with a flushing bit 22, and the lower joint 20 is fixed on the outer wall of the cylinder 6 by using a stable nail 5 after being connected with the cylinder 6 through threads.

The barrel 6 is hollow cylinder structure, the both ends of barrel 6 all have the external screw thread, be provided with on the outer wall of barrel 6 and supply scraping piece 11 axial telescopic mounting groove 15, mounting groove 15 sets up to two-layer at barrel 6 axial upper interval arrangement, every layer sets up three mounting groove 15, each adjacent mounting groove 15 in every layer is 120 along the radial contained angle of barrel 6 promptly, the adjacent position of two adjacent mounting grooves 15 that lie in the upper strata staggers each other with the adjacent position of two adjacent mounting grooves 15 that lie in the lower floor in the circumferencial direction of barrel 6, thereby can 360 cover barrel 6 periphery, and then can realize scraping position circumference, in order to guarantee the scraping effect.

The scraping pieces 11 are arranged in corresponding mounting grooves 15 on the cylinder 6, and the scraping pieces 11 are arranged in the upper layer mounting grooves 15, for example, the two ends of the scraping pieces 11 are provided with extending parts extending along the axial direction of the cylinder 6 and scraping parts connected with the extending parts, and the scraping parts protrude outwards along the radial direction of the cylinder 6; the extension part is provided with a groove, a spring 10 is assembled in the groove, and the spring 10 is respectively pressed in the mounting groove 15 through an upper pressing plate 9 and a lower pressing plate 16; the upper pressing plate 9 is fixed on the outer wall of the cylinder 6 through a pressing plate screw 8, and one side of the upper pressing plate 9, which is away from the spring 10, is abutted against the lower end of the upper joint 1; the lower pressing plate 16 is fixed on the outer wall of the cylinder 6 through pressing plate screws; the scraping sheet 11 installed in the lower installation groove 15 is arranged in a mirror image with the scraping sheet 11 installed on the upper layer, correspondingly, the upper pressing plate 9 for pressing the upper end of the scraping sheet 11 on the upper layer is arranged for pressing the lower end of the scraping sheet 11 when the scraping sheet 11 on the lower layer is pressed, and the lower pressing plate 16 for pressing the lower end of the scraping sheet 11 on the upper layer is arranged for pressing the upper end of the scraping sheet 11 when the scraping sheet 11 on the lower layer is pressed; in this embodiment, the upper platen 9 and the lower platen 16 each have a Z shape. The outer side surface of the scraping sheet 11, i.e. the surface facing the wall of the wellbore, is provided with scraping grooves, which can help to improve the scraping effect, and the scraping grooves can be specifically formed as scraping grooves on the scraping sheet in the prior art, and are not repeated here.

The center of each mounting groove 15, namely the position corresponding to the scraping part of the scraping piece 11, is provided with a piston hole 13, the piston hole 13 is arranged along the radial direction of the cylinder body 6, a piston 14 used for driving the scraping piece 11 to radially stretch and retract is arranged in the piston hole 13, one end of the piston 14 away from the scraping piece 11 is abutted on the inner wall of the central tube 7, thus the piston hole 13 and the inner wall of the central tube 7 form a piston cavity capable of being used for moving the piston 14, and the piston 14 can radially move in the piston cavity so as to push the scraping piece 11 to radially expand outwards, and further scraping the wall of a shaft is realized. In the present embodiment, the piston seal 12 is provided between the outer periphery of the piston 14 and the piston hole 13, so that the sealability between the piston 14 and the piston hole 13 can be improved, thereby ensuring the driving force of the piston 14.

The central tube 7 is arranged in the cylinder 6, the inner wall of the central tube 6 surrounds a central hole forming the cylinder 6, specifically, a first step 61 is arranged on the inner wall of the upper end of the cylinder 6, a second step matched with the first step 61 is arranged at the upper end of the central tube 7, a positioning fixing block 2 is arranged at the upper end of the central tube 7, the positioning fixing block 2 is provided with external threads, the central tube 7 is hung on the first step 61 of the cylinder 6 through the second step, and the positioning fixing block 2 is in threaded connection with the cylinder 6; the lower end of the central tube 7 is provided with a ball seat 18, and the ball seat 18 is connected with the cylinder 6 through a limit shear pin 19; thus, the central tube 7 is arranged in the cylinder 6 in an annular space, and a certain gap is arranged between the central tube 7 and the cylinder 6.

The both ends of the outer wall of barrel 6 all are provided with first seal groove, install first sealing washer 3 in the first seal groove, in this embodiment, first seal groove has two sets of, and every group contains two seal grooves, and one of them sets up between barrel 6 and upper joint 1, and another sets up between barrel 6 and lower joint 20, and first seal groove and first sealing washer 3 constitute the seal structure between barrel 6 and upper joint 1 and the lower joint 20.

The both ends of the inner wall of barrel 6 all are provided with the second seal groove, install second sealing washer 4 in the second seal groove, in this embodiment, second seal groove and second sealing washer 4 constitute the seal structure between barrel 6 and the center tube 7, and the second seal groove has two sets of, and every group contains two seal grooves, and one of them sets up in the position that is close to barrel first step 61, and another sets up in the position that is close to ball seat 18.

The both ends of the outer wall of ball seat 18 all are provided with the third seal groove, install third sealing washer 17 in the third seal groove, and in this embodiment, the third seal groove has two sets of, and every group contains two seal grooves, and third seal groove and third sealing washer 17 constitute the seal structure between ball seat 18 and the center tube 7.

The lower end of the central tube 7 is provided with a liquid outlet hole 21 between the two sets of third sealing grooves of the ball seat 18. Before the ball seat 18 is set, the outer wall of the ball seat 18 seals the liquid outlet 21; after the ball seat 18 is set, the ball seat 18 is continuously pressed to cut off the limit shear pin 19 of the ball seat 18, the ball seat 18 descends into the lower joint 20, so that the liquid outlet hole 21 of the central tube 7 is communicated with the central hole of the cylinder 6, in this way, the liquid outlet hole 21 of the central tube 7 and the gap between the cylinder 6 and the central tube 7 form a liquid supply structure of the piston 14, and high-pressure water enters the gap between the cylinder 6 and the central tube 7 through the liquid outlet hole 21, so that the piston 14 of the scraping piece 11 is pushed to move outwards along the radial direction of the cylinder 6.

As shown in fig. 2 to 4, the flushing bit 22 comprises a bit body extending along an axis, the bit body comprises a joint section, a scraping section and a drilling section which are sequentially arranged, the joint section is connected with the drilling section through the scraping section, the joint section of the bit body is provided with internal threads, and the flushing bit 22 is connected with external threads at the lower end of the lower joint 20 through the internal threads of the joint section; the bit body is a hollow cylindrical structure that forms a through flow channel 226 for flushing the bit; three drilling and grinding drill bits 223 are uniformly arranged on the end surface of the drilling and grinding section in the radial direction, and the drilling and grinding drill bits 223 extend along the radial direction of the drilling and grinding section; the scraping section is provided with two-stage reaming bits along the periphery of the bit body, specifically, eight first reaming bits 221 and six second reaming bits 222 are respectively provided, wherein the second reaming bits 222 are symmetrically arranged on two sides of the drilling and grinding bit 223 in pairs, the first reaming bits 221 are uniformly arranged on the periphery of the bit body, the outer diameter of the working face of each first reaming bit 221 is larger than the outer diameter of the working face of each second reaming bit 222, the maximum working outer diameter of each flushing bit 22 is smaller than the minimum working outer diameter of each scraping piece 11, and in the embodiment, the working outer diameter of the drilling and grinding bit 223 is smaller than the outer diameter of the working face of each second reaming bit 222; the maximum working outer diameter of the pilot bit 22 is dependent on the working surface outer diameter of the first reamer bit 221, i.e. the working surface outer diameter of the first reamer bit 221 needs to be no greater than the minimum working outer diameter of the scraping wings 11.

In this embodiment, the first reamer bit 221, the second reamer bit 222 and the drill bit 223 are all cemented carbide bits, and the cemented carbide bits have the characteristics of high hardness and good wear resistance, so that the service life of the bits can be effectively prolonged.

The front end of the drilling and grinding section is uniformly provided with three jet holes 224, the outlets of the jet holes 224 are positioned between adjacent drilling and grinding drill bits 223, the included angle between the central axis of the jet holes 224 and the central axis of the drill bit body is 5 degrees, and the jet holes 224 are communicated with a through flow channel 226 of the scouring drill bit 22; the cylindrical surface of the drilling and grinding section is radially provided with deflection holes 225, the included angle between the central axes of the eccentric holes 225 is 120 degrees, and the eccentric holes 225 are communicated with a through-flow channel 226 of the scouring drill bit 22.

With the structure of the integrated pipe column, the working process of the integrated pipe column is as follows:

after the integrated pipe column of the utility model is lowered into the well along with an oil pipe or the pipe column, the drilling and grinding drill bit 223 at the front end of the scouring drill bit 22 drills out an ash plug, and simultaneously, high-pressure water flow is pumped into the pipe column, and the ash plug is flushed through the jet hole 224 and the radial eccentric hole 225 at the front end of the scouring drill bit 22, and the first reaming drill bit 221 and the second reaming drill bit 222 further scrape and mill the ash plug part, so that the ash plug can be cleaned quickly; after the drilling plug is completed, a valve ball is thrown into the integrated pipe column of the utility model, setting is realized with the ball seat 18, the valve ball is continuously pressed into the integrated pipe column to 6MPa, the limit shear pin 19 of the ball seat 18 is sheared, the ball seat 18 descends into the lower joint 20 under the action of pressure, so that a liquid outlet 21 of the central pipe 7 is communicated with a gap between the cylinder 6 and the central pipe 7, high-pressure water enters the gap through the liquid outlet 21, the piston 14 is pushed to move outwards, the scraping piece 11 is pushed to overcome the resistance of the spring 10 and spread outwards until the scraping piece 11 is tightly attached to the inner wall of the sleeve, the scraping of the sleeve at the drilling ash end is realized through lifting or lowering the pipe column, and meanwhile, the high-pressure well liquid brings the scraped residual ash out of the shaft, and the scraping operation of the drilling plug is completed through one-pass pipe column, so that the cleaning of the shaft is realized.

Example 2 of the integrated column of the present utility model:

in embodiment 1 of the integrated column, the number of injection holes is set to three. In this embodiment, the number of the injection holes may be set according to actual needs, and may be set to two, or four or more.

Example 3 of the integrated column of the present utility model:

in embodiment 1 of the integrated column, the central axis of the injection hole and the central axis of the bit body form an angle of 5 °. In this embodiment, the included angle between the central axis of the injection hole and the central axis of the drill bit body may be set according to actual needs, and the included angle between the central axis of the injection hole and the central axis of the drill bit body may be set to 0 ° or an angle between 0 ° and 5 ° or other suitable angles, so as to avoid the impact of water flows ejected from different injection holes with each other and reduce the flushing effect on the wellbore.

Example 4 of the integrated column of the present utility model:

in example 1 of the integrated pipe string, the included angle between the central axes of the eccentric holes was 120 °. In three embodiments, the included angle between the central axes of the eccentric holes can be set as required, and can be set to 60 °, 45 °, 36 °, 30 °.

Example 5 of the integrated column of the present utility model:

in example 1 of the integrated pipe string, the reamer bit is provided with two stages. In this embodiment, the number of stages of the reamer bit may be set as required, and may be set to one stage, or more than three stages;

example 6 of the integrated column of the present utility model:

in example 1 of the integrated pipe string, eight first reamer bits and six second reamer bits are provided, respectively. In this embodiment, the number of reamer bits may be set as required, and the first reamer bit may be set to six, four or other suitable numbers; the second reamer bit may be provided in eight, four or other suitable numbers.

Example 7 of the integrated column of the present utility model:

in example 1 of the integrated column, the scraping pieces are provided in two layers arranged at intervals in the axial direction of the cylinder, and three scraping pieces are provided in each layer. In this embodiment, the scraping sheet may be provided as one layer, or more than three layers, and specifically, a suitable number of layers may be provided as required; each layer is provided with two scraping sheets or more than four scraping sheets, and the number of the scraping sheets can be properly set according to the requirement.

The above description is only a preferred embodiment of the present utility model, and the patent protection scope of the present utility model is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. The utility model provides an integration tubular column, includes barrel and locates the epaxial scraping piece of barrel circumference, its characterized in that: the radial piston hole is formed in the cylinder body, a piston used for driving the scraping piece is arranged in the piston hole, a central tube is arranged in the cylinder body, a gap is formed between the central tube and the cylinder body, a ball seat and a liquid outlet hole are formed in the lower end of the central tube, the ball seat is connected with the cylinder body through a shear pin and seals the liquid outlet hole, and the liquid outlet hole is communicated with the piston hole through the gap; the barrel is connected with a flushing drill bit, and the flushing drill bit is provided with a flushing structure.

2. The integrated pipe string of claim 1, wherein: one end of the piston, which is far away from the scraping piece, is abutted against the inner wall of the central tube.

3. The integrated pipe string of claim 1 or 2, wherein: and a piston sealing ring is arranged on the wall of the piston hole.

4. The integrated pipe string of claim 1 or 2, wherein: a sealing structure is arranged between the cylinder body and the central tube, and the sealing structure comprises a sealing groove arranged on the inner wall of the cylinder body and a sealing ring arranged in the sealing groove.

5. The integrated pipe string of claim 1, wherein: the center of the flushing bit is provided with a through-flow channel, the flushing structure comprises an injection hole and an eccentric hole which are arranged at one end of the flushing bit, and the injection hole and the eccentric hole are respectively communicated with the through-flow channel.

6. The integrated pipe string of claim 5, wherein: the central axis of the jet hole forms an included angle with the central axis of the scouring drill bit.

7. The integrated pipe string of claim 6, wherein: the eccentric holes are arranged along the radial direction of the scouring drill bit, and included angles among central axes of the eccentric holes are equal.

8. The integrated pipe string of claim 5 or 6 or 7, wherein: the scour drill comprises a drill body extending along an axis, wherein the drill body comprises a joint section, a drilling and grinding section and a scraping section for connecting the drilling and grinding section and the joint section; the joint section is connected with the lower joint of the cylinder body; the bottom of the drilling and grinding section is provided with a drilling and grinding drill bit, and the scraping section is provided with a reaming drill bit.

9. The integrated pipe string of claim 8, wherein: the outer diameter of the working face of the reaming bit close to the drilling and grinding bit is smaller than the outer diameter of the working face of the reaming bit far away from the drilling and grinding bit.

10. The integrated pipe string of claim 9, wherein: the working face outer diameter of the drilling and grinding drill bit is not larger than the working face outer diameter of the reaming drill bit with the smallest working face outer diameter.