CN212359681U - Drilling rod inner wall mud skin belt cleaning device - Google Patents

Abstract

The utility model provides a drilling rod inner wall mud skin belt cleaning device relates to geological drilling rope coring and gets rid of drilling rod inner wall mud skin equipment technical field, has solved the sealed easy technical problem that loses efficacy, structure are complicated of belt cleaning device. The device for cleaning the mud skin on the inner wall of the drill rod comprises an outer cylinder, wherein the outer cylinder is of a hollow structure, the bottom of the outer cylinder is sealed, and a liquid flow main channel for high-pressure liquid flow to pass through and a liquid flow branch channel which is communicated with the liquid flow main channel and can branch and guide the high-pressure liquid flow are arranged in the outer cylinder; the static nozzle and the dynamic nozzle are detachably arranged on the outer cylinder and are communicated with the liquid flow branch channel so as to spray high-pressure liquid flow to the inner wall of the drill rod; the high-pressure liquid flow can be sprayed out from the movable nozzle in a rotational flow mode through the rotational flow nozzle. The utility model has the characteristics of cleaning performance is good, the coverage is wider, longe-lived, simple structure.

Description

Drilling rod inner wall mud skin belt cleaning device

Technical Field

The utility model belongs to the technical field of geology drilling rope coring equipment technique and specifically relates to a drilling rod inner wall mud skin belt cleaning device is got rid of.

Background

The rope coring drilling technology is a great revolution of drilling technology, and has the technical characteristics that the drill rod in the drill hole is not required to be completely lifted out during coring, and a special fisher with a steel wire rope is used for fishing the inner pipe with the core to the ground surface through the center of the drill rod and taking out the core. With the strategic shift of the key points of geological work in China, the exploration workload of unconventional energy sources such as shale gas and oil shale is continuously increased. The rope coring drilling technology has the advantages that the auxiliary time for tripping the drill is shortened, the pure drilling time is increased, and the deeper the drill hole is, the more obvious the economic effect is; the screw thread screwing and unscrewing abrasion of the drill rod is reduced, the service life of the drill rod is prolonged, and the pipe consumption is reduced; the method has a series of advantages of reducing the abrasion of the hole sweeping of the drill bit, screwing off and collision with the hole wall, prolonging the service life of the drill bit and the like, and can take out the physical core to provide the most direct formation information for geologists, so the method has a great significance in unconventional energy source shale gas and oil shale exploration.

However, in the process of wire line coring drilling, due to various reasons such as geological structures, drilling fluid components, drilling processes and the like, mud skin is often generated on the inner wall of a drill rod, the mud skin is increasingly serious along with the continuation of drilling time, when an inner pipe assembly is salvaged, a fisher cannot be normally put into the drill rod or cannot be normally lifted to the ground surface after the inner pipe assembly is salvaged, the salvage time of the inner pipe assembly is increased by tens of times, or a steel wire rope connected with the fisher is broken, serious in-hole accidents are caused, and serious economic loss is caused. Therefore, the problem of the drill rod mud layer is solved, the important guarantee of the technical advantages of the rope core drilling is fully exerted, if the problem of the mud layer cannot be solved, the auxiliary time of the rope core drilling is greatly increased, and the drilling cost is increased linearly.

The general treatment mode of solving drilling rod knot mud skin at present has: strictly controlling the solid phase content of the drilling fluid, adding a surfactant into the drilling fluid, reducing the adsorption force between solid phase particles and a drill rod, controlling the rotating speed, and lengthening the length of a circulating tank of the drilling fluid, wherein the length is generally not less than 15 m; a series of measures such as timely slag removal and drilling fluid replacement are additionally arranged. However, when a special stratum such as a naturally slurried stratum is encountered, a large amount of mud skin is still accumulated on the inner wall of the drill pipe as the drilling time is prolonged. Regardless of the above treatment modes, a large amount of mud skin always gathers on the inner wall of the drill rod in the drilling process under special working conditions, and once the situation occurs, a technical scheme with high cleaning efficiency, high cleaning degree and convenience is urgently needed.

In order to remove the mud skin on the inner wall of the drill rod when a special bottom layer is formed, the prior technical scheme is that a nozzle is arranged in the inner wall of the drill rod for spraying high-pressure fluid, and the jet flow can be used as a tool for cleaning the surface of the inner wall of the drill rod and crushing the attached mud skin. The cleaning effect is mainly embodied in the hitting force of the water jet on the attachments on the inner wall of the drill rod, and if the pressure intensity of the water jet acting on the inner wall of the drill rod is greater than the compressive strength of the mud skin attached to the surface of the inner wall of the drill rod, the attached mud skin can be damaged and washed away by the high-pressure jet.

The applicant has found that the prior art has at least the following technical problems:

(1) the number and the arrangement mode of the nozzles are unreasonable, and the sprayed liquid is not enough to fully cover the inner wall of the drill rod, so that the cleaning is not clean; (2) the ejected fluid can not well form rotational flow, can not form continuous jet flow impact, extrusion, water wedge and other cleaning effects on the mud skin attached to the inner wall of the drill rod, and is not enough to efficiently clean the mud skin and enable the mud skin to return upwards along with well drilling fluid; (3) for a rotary spray head, the seal can fail after long-term use, and the design structure of the precise rotary spray is complex and high in cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a drilling rod inner wall mud skin belt cleaning device to solve the sealed technical problem who easily loses efficacy, the structure is complicated of belt cleaning device who exists among the prior art.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a drilling rod inner wall mud skin belt cleaning device, including the urceolus, the urceolus is hollow structure, and the bottom is sealed, and the inside has the liquid flow main entrance that supplies high-pressure liquid stream to pass through and with the liquid flow main entrance intercommunication can carry out the liquid flow branch passageway that branches the direction with high-pressure liquid stream; the static nozzle and the dynamic nozzle are detachably arranged on the outer cylinder and communicated with the liquid flow branch channel so as to spray high-pressure liquid flow to the inner wall of the drill rod; the high-pressure liquid flow can be sprayed out of the movable nozzle in a rotational flow mode through the rotational flow nozzle.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

As a further improvement, the liquid flow branch passageway divide into about two-layer setting, and every layer the liquid flow branch passageway all follows the urceolus circumferencial direction is whole circle and evenly sets up, and the axis of upper and lower two-layer every passageway is 45 with the contained angle of vertical direction, and the interval of the horizontal projection of every passageway axis on upper strata becomes 60, and the interval of the horizontal projection of every passageway axis on lower floor becomes 120.

As a further improvement of the utility model, the quiet nozzle is located move nozzle upper portion, just the quiet nozzle with move the equal sloping downward sloping setting of nozzle, quiet nozzle quantity is six, it is three to move nozzle quantity, and the setting of misplacing about the two.

As a further improvement of the utility model, the static nozzle and the movable nozzle are in screwed connection on the outer barrel.

As a further improvement of the utility model, the static nozzle comprises a basic cylindrical section, a contraction section and an outlet rectification section which are arranged in sequence; an external thread section connected with the outer barrel is arranged on the basic cylindrical section; the taper theta of the contraction section is 12-14 degrees; the ratio of the diameter a of the outlet end of the static nozzle to the diameter A of the inlet end of the static nozzle is 0.5-0.6; the outlet rectifying section is of a cylindrical structure, and the length of the outlet rectifying section is 3-4 times of the diameter a of the outlet end of the static nozzle; and a first bionic ring groove for reducing resistance and increasing speed is arranged on the surface of the inner flow passage of the static nozzle.

As a further improvement of the present invention, the first bionic ring grooves are arranged in a full circle along the circumferential direction of the surface of the inner flow passage of the static nozzle, and the first bionic ring grooves are provided in a plurality of numbers and are uniformly arranged along the axial direction of the static nozzle, and the ratio range of the cutting depth d of the first bionic ring groove to the groove width w is 2-3; the ratio range of the groove center distance D of the first bionic ring groove to the groove width w is 2.5-5.

As a further improvement of the utility model, the movable nozzle comprises a frustum-shaped bionic shell, a plate-type sealing ring, a splitter disc, a swirl nozzle, a bionic washer and an upper joint, wherein the plate-type sealing ring, the splitter disc, the swirl nozzle and the bionic washer are sequentially arranged in the bionic shell, and the upper joint is screwed on the plate-type sealing ring at the end of the top of the bionic shell; two ends of the inner cavity of the upper joint are respectively communicated with the liquid flow branch channel and the inner cavity of the diverter tray; a liquid outlet capable of outputting liquid in an inner cavity of the flow distribution disc after the liquid is turned by 90 degrees is formed in the side wall of the flow distribution disc, and an annular clamping groove used for limiting and guiding one end of the swirl nozzle is formed in the bottom of the flow distribution disc along the circumferential direction; one side of the bionic washer, which faces the cyclone nozzle, is provided with a frustum-shaped clamping groove for limiting and guiding the other end of the cyclone nozzle, the cyclone nozzle is obliquely and eccentrically arranged between the splitter disc and the bionic washer, the cyclone nozzle is of a cylindrical rod-shaped structure and internally provided with a fluid cavity, the side wall of the cyclone nozzle is provided with a strip-shaped water inlet, and one end of the cyclone nozzle, which is close to the bionic washer, is provided with a water spray opening communicated with the water outlet of the bionic washer; the inner wall of the bionic shell is uniformly provided with second bionic convex hulls or second bionic concave pits for reducing resistance and increasing speed; third bionic pits for reducing resistance and increasing speed are uniformly arranged on the inner wall of the frustum-shaped clamping groove of the bionic washer; and a fourth bionic ring groove for reducing resistance and increasing speed is arranged on the surface of the fluid cavity of the swirl nozzle.

As a further improvement of the utility model, one end of the swirl nozzle is provided with a hemispherical positioning ball, the width and depth of the annular clamping groove are matched with the specification of the positioning ball, and the positioning ball and the annular clamping groove are in a point-surface contact structure; the other end of the swirl nozzle is of a hemispherical structure, the specification of the frustum-shaped clamping groove is matched with that of the hemispherical end of the swirl nozzle, and a surface-to-surface contact structure is arranged between the hemispherical end of the swirl nozzle and the frustum-shaped clamping groove.

As a further improvement of the present invention, the fourth bionic ring grooves are arranged in a full circle along the circumferential direction of the fluid chamber of the swirl nozzle, and the number of the fourth bionic ring grooves is multiple and is uniformly arranged along the axial direction of the swirl nozzle, and the ratio range of the cutting depth d of the fourth bionic ring groove to the groove width w is 2-3; the ratio range of the groove center distance D of the fourth bionic ring groove to the groove width w is 2.5-5.

As a further improvement of the utility model, the inside of the bionic shell is frustum-shaped, and the second bionic convex hull, the second bionic pit or the third bionic pit is a bionic non-smooth unit convex hull or pit taking a convex hull on the dung beetle body surface as a biological prototype; the area of the second bionic convex hull and the area of the second bionic concave pit account for 10-60% of the area of the inner wall of the bionic shell; the area of the third bionic pit accounts for 40-60% of the area of the inner wall of the bionic washer; the specifications of the second bionic convex hull, the second bionic concave pit or the third bionic concave pit meet the mathematical model,

and

compared with the prior art, the utility model following beneficial effect has:

the utility model provides a cleaning device for mud skin on the inner wall of a drill rod, which comprises an outer cylinder, a static nozzle and a dynamic nozzle; the inner walls of the static nozzle and the movable nozzle are provided with bionic non-smooth unit bodies for reducing resistance and increasing speed; the static nozzle and the dynamic nozzle are sequentially arranged at the upper stage and the lower stage of the outer cylinder, the inner part of the outer cylinder is hollow and is provided with a liquid flow channel, a main channel of the liquid flow channel presents a cylindrical contraction shape, and a branch channel of the liquid flow channel is divided into the upper stage and the lower stage; the included angle between the central axis of each channel of the upper and lower stages and the vertical direction is 45 degrees, the upper stage is provided with 6 channels, the interval of the horizontal projection of the central axis of each channel is 60 degrees, the lower stage is provided with 3 channels, the interval of the horizontal projection of the central axis of each channel is 120 degrees, and the upper and lower stages are arranged in a staggered way; high-pressure liquid flows through the upper and lower two-stage nozzles, and the high-pressure liquid sprayed by the static nozzle acts on the surface of the mud skin attached to the inner wall of the drill rod, so that the effects of impacting, crushing, stripping and shedding the mud skin are achieved; the high-pressure liquid sprayed out by the movable nozzle acts on the surface of the mud skin attached to the inner wall of the drill rod, and the effects of impacting, shearing, crushing, cavitation, grinding, stripping and falling off the mud skin are achieved; the utility model provides a belt cleaning device to characteristics such as drilling rod inner wall mud skin adhesion surface is wide, be stained with the adhesion nature strong, through the design of the bionical nozzle of doublestage sound coupling, has overcome prior art's limitation and constraint nature, will play following beneficial effect: firstly, the upper and lower two-stage movable and static nozzles act simultaneously, and the lower movable nozzle can supplement and reinforce the cleaning of the upper static nozzle; the rotational flow jetted by the lower movable nozzle is beneficial to improving the chip carrying capacity of the drilling fluid and better carrying the fallen mud skin out of the drill rod; the lower movable nozzle is connected with the outer cylinder in a fixed thread manner, and the internal swirl nozzle realizes swirl ejection of high-pressure liquid flow, so that the defects of complex structure, high cost, easy failure of a bearing and the like of the conventional underground rotary ejection structure are overcome; the acting force form of the high-pressure fluid ejected by the two-stage nozzles acting on the mud skin attached to the inner wall of the drill rod is more variable, and the mud skin is favorably fallen off; the cleaning coverage is wider, and the efficiency is greatly improved. The bionic structure has simple design and excellent resistance reduction effect, and can effectively improve the characteristics of internal fluid and the friction resistance of the contact surface inside the component.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the assembled movable and static nozzles of the mud-skin cleaning device for the inner wall of the drill rod of the present invention;

FIG. 2 is an exploded view of the device for cleaning mud on the inner wall of the drill rod of the utility model;

FIG. 3 is a schematic view of the device for cleaning mud on the inner wall of the drill rod according to the present invention when the device is placed in the drill rod;

FIG. 4 is a schematic structural view of an outer cylinder in the device for cleaning mud on the inner wall of the drill rod of the present invention;

fig. 5 is a schematic structural view of the movable nozzle in the device for cleaning mud on the inner wall of the drill rod of the utility model.

FIG. 6 is a sectional view of the movable nozzle in the device for cleaning mud on the inner wall of the drill rod of the utility model;

FIG. 7 is an exploded view of a movable nozzle in the device for cleaning mud on the inner wall of the drill rod of the utility model;

FIG. 8 is a structural view of an upper joint of a movable nozzle in the device for cleaning the mud and the crust on the inner wall of the drill rod of the utility model;

FIG. 9 is a structure diagram of a bionic shell of a movable nozzle in the cleaning device for the mud and skin on the inner wall of the drill rod of the utility model;

FIG. 10 is a cross-sectional view of a bionic shell of a movable nozzle in the device for cleaning mud on the inner wall of the drill rod of the utility model;

FIG. 11 is a sectional view of the movable nozzle in the device for cleaning mud on the inner wall of the drill rod of the utility model;

FIG. 12 is a schematic view of a mathematical model of a second bionic convex hull in a movable nozzle of the device for cleaning mud and skin on the inner wall of the drill rod of the utility model;

FIG. 13 is a structural diagram of a splitter plate in a movable nozzle of the device for cleaning mud and skin on the inner wall of the drill rod of the utility model;

FIG. 14 is a top view of FIG. 13;

FIG. 15 is a bottom view of FIG. 13;

FIG. 16 is a structural diagram of a swirl nozzle in a movable nozzle in the device for cleaning mud and skin on the inner wall of a drill rod of the utility model;

FIG. 17 is a cross-sectional view of FIG. 16;

FIG. 18 is an enlarged partial schematic view of FIG. 17;

FIG. 19 is a structural diagram of a bionic washer in a movable nozzle of the device for cleaning mud and skin on the inner wall of the drill rod of the utility model;

FIG. 20 is a cross-sectional view of FIG. 19;

FIG. 21 is an enlarged partial schematic view of FIG. 20;

FIG. 22 is a schematic view of a mathematical model of a third bionic pit in a movable nozzle of the device for cleaning mud and skin on the inner wall of the drill rod of the utility model;

FIG. 23 is a schematic structural view of a static nozzle in the device for cleaning mud on the inner wall of the drill rod of the present invention;

FIG. 24 is a sectional view of a static nozzle in the device for cleaning mud on the inner wall of the drill rod of the utility model;

FIG. 25 is a schematic diagram showing specifications of each part of the static nozzle in the device for cleaning mud on the inner wall of the drill rod.

In figure 1, an outer cylinder; 2. a static nozzle; 3. a movable nozzle; 4. a main flow channel; 5. an upper stage liquid flow branch channel; 6. a lower level flow branch channel; 7. an upper joint; 8. a flat plate type sealing ring; 9. a diverter tray; 10. a swirl nozzle; 11. a biomimetic washer; 12. a biomimetic housing; 13. a second bionic convex hull; 14. a liquid inlet; 15. a liquid outlet; 16. an annular neck; 17. a positioning ball; 18. a water inlet; 19. a water jet; 20. a fourth bionic ring groove; 21. a third bionic pit; 22. a base cylindrical section; 23. a contraction section; 24. an outlet rectifying section; 25. screwing and disassembling the end; 26. a first bionic ring groove; 100. and (5) drilling a rod.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, 2 and 3, the utility model provides a drill pipe inner wall mud skin cleaning device, which comprises an outer cylinder 1, wherein the outer cylinder 1 is of a hollow structure, the bottom of the outer cylinder is sealed and is hemispherical, and high-pressure liquid flow enters from the top of the outer cylinder 1; the inside of the main liquid flow channel is provided with a main liquid flow channel 4 for passing high-pressure liquid flow and a liquid flow branch channel which is communicated with the main liquid flow channel 4 and can branch and guide the high-pressure liquid flow; the main liquid flow channel 4 is in a cylindrical contraction shape; the device also comprises a static nozzle 2 and a dynamic nozzle 3 which are detachably arranged on the outer cylinder 1 and communicated with the liquid flow branch channel so as to spray high-pressure liquid flow to the inner wall of the drill rod 100; the high-pressure liquid jet nozzle also comprises a swirl nozzle 10 movably arranged in the movable nozzle 3, and the high-pressure liquid flow can be sprayed out of the movable nozzle 3 in a swirl mode through the swirl nozzle 10.

As shown in fig. 1 and 4, the liquid flow branch channel is divided into an upper layer and a lower layer, which are respectively an upper layer liquid flow branch channel 5 and a lower layer liquid flow branch channel 6, and each layer of liquid flow branch channel is uniformly arranged along the circumferential direction of the outer cylinder 1.

As shown in fig. 23-25, the static nozzles 2 are located at the upper part of the movable nozzles 3, and the static nozzles 2 and the movable nozzles 3 are both obliquely and downwardly inclined, the number of the upper-stage liquid flow branch channels 5 is six, the included angle between the central axis of each channel and the vertical direction is 45 °, the interval of the horizontal projection of the central axis of each channel is 60 °, the number of the static nozzles 2 is six, and the static nozzles are sequentially connected to the six upper-stage liquid flow branch channels 5; the number of the lower-stage liquid flow branch channels 6 is three, the included angle between the central axis of each channel and the vertical direction is 45 degrees, the horizontal projection of the central axis of each channel is separated into 120 degrees, the number of the movable nozzles 3 is three, the movable nozzles are sequentially connected to the three lower-stage liquid flow branch channels 6, and the movable nozzles 3 and the static nozzles 2 are arranged in a vertically staggered mode.

As shown in fig. 2, the outer cylinder 1 is provided with internal thread sections at the ends corresponding to the upper stage liquid flow branch passage 5 and the lower stage liquid flow branch passage 6, and the static nozzle 2 and the dynamic nozzle 3 are provided with external thread sections at the corresponding positions, and both are screwed on the outer cylinder 1 through threads.

As shown in fig. 23, as a further improvement of the present invention, the static nozzle 2 includes a basic cylindrical section 22, a contraction section 23 and an outlet rectification section 24 which are sequentially arranged; an external thread section connected with the outer cylinder 1 is arranged on the basic cylindrical section 22; the taper theta of the contraction section 23 is 12-14 degrees; the ratio of the diameter a of the outlet end of the static nozzle 2 to the diameter A of the inlet end is 0.5-0.6; the outlet rectifying section 24 is of a cylindrical structure, and the length of the outlet rectifying section is 3-4 times of the diameter a of the outlet end of the static nozzle 2; a first bionic ring groove 26 for reducing resistance and increasing speed is arranged on the surface of the inner flow passage of the static nozzle 2. For convenient holding and assembling and disassembling, the end part of the outlet rectifying section 24 of the static nozzle 2 is provided with a screwing and disassembling end 25 which is convenient to be connected with and disassembled from the outer cylinder 1.

As shown in fig. 24 and 25, further, the first bionic ring grooves 26 are arranged in a full circle along the circumferential direction of the surface of the inner flow passage of the static nozzle 2, and a plurality of the first bionic ring grooves 26 are uniformly arranged along the axial direction of the static nozzle 2, and the ratio range of the cutting depth d of the first bionic ring grooves 26 to the groove width w is 2-3; the ratio of the groove center distance D to the groove width w of the first bionic ring groove 26 ranges from 2.5 to 5.

As shown in fig. 5, 6 and 8, as an optional embodiment of the present invention, the movable nozzle 3 includes a frustum-shaped bionic shell 12, a plate-type sealing ring 8, a splitter disk 9, a swirl nozzle 10, a bionic washer 11, and an upper joint 7 screwed on the top end of the bionic shell 12 and abutted against the plate-type sealing ring 8, which are sequentially disposed in the bionic shell 12; two ends of the inner cavity of the upper joint 7 are respectively communicated with the liquid flow branch channel and the inner cavity of the diverter disc 9; as shown in fig. 13 and 14, the bottom of the diverter tray 9 is sealed, liquid outlets 15 capable of turning the liquid in the inner cavity of the diverter tray to 90 degrees and outputting the liquid are arranged on the side walls of the diverter tray 9, liquid inlets 14 are horizontally arranged in the diverter tray 9, the number of the liquid inlets 14 is two, the liquid inlets 14 are arranged in a relative staggered manner, the liquid inlets 14 are communicated with the liquid outlets 15, the liquid inlets 14 are used for turning the high-pressure liquid flow entering the diverter tray 9 to 90 degrees and then flowing out of the diverter tray 9 from the liquid outlets 15 through the liquid inlets 14, and a gap is formed between the diverter tray 9 and; as shown in fig. 7 and 15, an annular slot 16 for limiting and guiding one end of the swirler 10 is arranged at the bottom of the splitter plate 9 facing the swirler 10 along the circumferential direction; the annular clamping groove 16 is arranged along the outer ring at the bottom of the diverter disc 9; as shown in fig. 19, 20 and 21, a frustum-shaped clamping groove for limiting and guiding the other end of the swirl nozzle 10 is arranged on one side of the bionic washer 11 facing the swirl nozzle 10, the concrete frustum-shaped clamping groove is positioned at the center of the bionic washer 11, the swirl nozzle 10 is obliquely and eccentrically arranged between the splitter disc 9 and the bionic washer 11, the swirl nozzle 10 is of a cylindrical rod-shaped structure, a fluid cavity is arranged in the swirl nozzle, a strip-shaped water inlet 18 is arranged on the side wall of the swirl nozzle, and a water spray opening 19 communicated with a water outlet of the bionic washer 11 is arranged at one end of the swirl nozzle 10 close to the bionic washer; as shown in fig. 9 and 10, the inner wall of the bionic shell 12 is uniformly provided with a second bionic convex hull 13 or a second bionic concave pit for reducing drag and increasing speed; third bionic pits 21 for reducing drag and increasing speed are uniformly arranged on the inner wall of the frustum-shaped clamping groove of the bionic washer 11; as shown in fig. 17 and 18, the fluid chamber surface of the swirl nozzle 10 is provided with a fourth bionic ring groove 20 for reducing drag and increasing speed.

As shown in fig. 11 and 16, further, a hemispherical positioning ball 17 is arranged at one end of the swirler 10, the width and depth of the annular clamping groove 16 are adapted to the specification of the positioning ball 7, and the positioning ball 17 and the annular clamping groove 16 are in a point-surface contact structure to reduce the motion resistance; when high-pressure liquid flows into the bionic shell 12 through the splitter plate 9, the swirl nozzle 10 rotates under the action of liquid flow impact force, the positioning ball 17 can move in the annular clamping groove 16, the other end of the swirl nozzle 10 rotates in the frustum-shaped clamping groove, the rotation of the swirl nozzle 10 forms sprayed high-pressure liquid flow to form swirl, and the swirl is sprayed on the inner wall of the drill rod 100 in a swirl form to clean mud skin; the other end of the swirl nozzle 10 is of a hemispherical structure, the specification of the frustum-shaped clamping groove is matched with that of the hemispherical end part of the swirl nozzle 10, and a surface-to-surface contact structure is arranged between the hemispherical end part of the swirl nozzle 10 and the frustum-shaped clamping groove.

As shown in fig. 8, 9, 13, 14, 15 and 16, when the high-pressure liquid flows from the upper stage liquid flow branch passage 5 through the upper joint 7 of the movable nozzle 3 into the diverter tray 9; then liquid flow enters from a liquid inlet 14 of the diverter disc 9 and is sprayed out from a liquid outlet 15 of the diverter disc 9, and rotational flow is generated in the bionic shell 12; the swirling flow generates a thrust force to the swirl nozzle 10 which is eccentrically arranged, so that the swirl nozzle rotates around the central axis, and meanwhile, liquid flow enters the interior of the swirl nozzle 10 from the water inlet 18 of the swirl nozzle 10, passes through the fourth bionic ring groove 20 on the inner wall of the swirl nozzle 10 and finally is sprayed out from the water spraying opening 19 of the swirl nozzle 10.

Specifically, the fourth bionic ring grooves 20 are arranged in a whole circle along the circumferential direction of the fluid cavity of the swirl nozzle 10, the number of the fourth bionic ring grooves 20 is multiple, the fourth bionic ring grooves are uniformly arranged along the axial direction of the swirl nozzle 10, and the ratio range of the cutting depth d of the fourth bionic ring grooves 20 to the groove width w is 2-3; the ratio range of the groove center distance D and the groove width w of the fourth bionic ring groove 20 is 2.5-5.

As shown in fig. 12 and 22, as an alternative embodiment of the present invention, the inside of the bionic shell 12 is in a frustum shape, and the second bionic convex hull 13, the second bionic concave pit or the third bionic concave pit 21 is a bionic non-smooth unit convex hull or concave pit taking a convex hull on the surface of the dung beetle as a biological prototype; the area of the second bionic convex hull 13 or the second bionic concave pit accounts for 10-60% of the area of the inner wall of the bionic shell 12; the area of the third bionic pit 21 accounts for 40-60% of the area of the inner wall of the bionic washer 11; the specifications of the second bionic convex hull 13, the second bionic concave pit or the third bionic concave pit 21 meet the mathematical model,

and

the cross section structure of the bionic non-smooth unit convex hull or concave pit has the following parameters: angle theta, radius R, depth h, width d.

When the device is used, high-pressure liquid flow passes through an internal channel of the outer barrel 1 and is sprayed out from the static nozzle 2 and the movable nozzle 3, when fluid sprayed out from the lower movable nozzle 3 impacts a mud skin attached to the inner wall of the drill rod 100, the sprayed fluid is decomposed along two directions, the fluid in the normal direction forms vertical extrusion impact on the mud skin, the fluid in the radial direction forms a water wedge shearing action on the mud skin, and the mud skin attached to the inner wall of the drill rod can be efficiently and quickly cleaned under the comprehensive action of the two forces; when fluid jetted from the upper static nozzle 2 impacts the mud skin attached to the inner wall of the drill rod 100, cracks can be generated on the attached mud skin layer, then the tiny cracks are diffused and developed, and the mud skin layer attached to the inner wall of the drill rod 100 can be broken after the water wedge is formed; through the interaction of the upper-stage dynamic and static nozzles and the lower-stage dynamic and static nozzles, the attached mud skin is finally stripped and falls off from the inner wall of the drill rod 100, and is flushed away from the surface of the inner wall of the drill rod 100, and is taken away along with the circulation of well drilling fluid, so that the effect of cleaning the mud skin is achieved; the problems that the existing solutions and technologies are not thorough in cleaning, low in cleaning efficiency and complex in cleaning process when the mud skin attached to the inner wall of the drill rod is cleaned can be effectively solved.

The utility model discloses a working process does:

the nozzle is suspended into a drill pipe 100 in a borehole, and high-pressure liquid flow firstly passes through a liquid flow main channel 4 of an outer barrel 1; then the liquid flows are sprayed out from the static nozzle 2 and the dynamic nozzle 3 through the upper-stage liquid flow branch channel 5 and the lower-stage liquid flow branch channel 6, wherein the liquid flows sequentially pass through the basic cylindrical section 22, the contraction section 23, the outlet rectifying section 24 and the first bionic ring groove 26 in the static nozzle 2 when passing through the upper-stage liquid flow branch channel; the first bionic ring groove has excellent drag reduction effect, can effectively improve the liquid flow characteristic in the nozzle, increases the jet speed of the liquid flow, and has good impact, crushing, stripping and falling effects on the mud skin attached to the drill rod 100; when liquid flows through the lower movable nozzle 3, when the liquid sequentially passes through the liquid inlet 14 and the liquid outlet 15 of the splitter plate 9, rotational flow is generated in the bionic shell 12, so that the rotational flow nozzle 10 is pushed to eccentrically rotate between the splitter plate 9 and the bionic washer 11 in the bionic shell 12, and meanwhile, the liquid flow is sprayed out from the water spraying port 19 of the rotational flow nozzle 10; because the swirl nozzle 10 is eccentrically arranged, the bionic non-smooth unit body convex hull on the inner wall of the bionic shell 12 and the bionic non-smooth unit body concave pit on the inner wall of the bionic washer 11, the swirl nozzle 10 eccentrically rotates around the central shaft; the bionic non-smooth unit body convex hulls and the pits have excellent resistance reduction effect, the liquid flow characteristic in the nozzle can be effectively improved, and the friction force between the swirl nozzle 10 and the inner wall of the bionic washer 11 is reduced; the mud skin attached to the drill rod is subjected to good impact, shearing, crushing, cavitation, grinding, stripping and falling effects; in addition, when the two-stage dynamic and static coupling bionic nozzle works upwards from the bottom of a drill rod in a hole, the upper and lower dynamic and static nozzles act simultaneously, and the lower dynamic nozzle can supplement and reinforce the cleaning of the upper static nozzle; the rotational flow jetted by the lower movable nozzle is beneficial to improving the chip carrying capacity of the drilling fluid and better carrying the dropped mud skin out of the drill rod; the lower movable nozzle overcomes the defects of difficult control of the calculation precision, easy failure of a bearing and the like of the traditional underground transfer jet technology; the acting force form of the high-pressure liquid flow ejected by the two-stage nozzles acting on the mud skin attached to the inner wall of the drill rod is more variable, and the mud skin is favorably fallen off; the cleaning coverage is wider, and the efficiency can be greatly improved.

Bionics (Bionics) is a comprehensive interdisciplinary subject that addresses human needs by applying mechanisms and laws discovered from the biological world, and is a basis for the innovative design of technology, using the structure and life activity processes of natural biological systems, to consciously perform simulation and replication. Bionics has been developed rapidly once it is born, and great achievements have been made in many fields of scientific research and technical engineering.

The organisms form body surface morphology and structural characteristics which are harmonious and compatible with the nature by themselves after the evolution and adaptation for hundreds of millions, namely, the organisms take periodically arranged unit bodies as basic units, take the characteristics of non-smooth morphology, non-smooth structure, non-smooth chemistry and the like as technical bases, have the synergistic coupling effect of multiple functions and present the maximum adaptability to the natural environment. Soil animals such as earthworms, mole cricket, ants, dung beetles and pangolins move freely between moist soil and sharp sandstone without adhering to the soil on the surface. The leaf surfaces of plants such as lotus leaves, rice leaves and the like can produce sludge without being dyed. It can be seen that the non-slippery phenomenon is ubiquitous in nature. By non-smooth surface is meant herein a macroscopic surface along one or more dimensions where at least one non-smooth effect is present or occurs on a precursor. The geometric non-smooth characteristic is presented on the body surfaces of soil animals such as earthworms, mole crickets, ants, dung beetles, pangolins and the like, namely structural unit bodies with certain geometric shapes are randomly or regularly distributed on certain parts of the body surfaces, and the unit body shapes comprise scaly shapes, convex bag shapes, concave pit shapes, bristle shapes, corrugated shapes and the like.

It should be noted that "inward" is a direction toward the center of the accommodating space, and "outward" is a direction away from the center of the accommodating space.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship indicated based on the orientation or positional relationship shown in fig. 1, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The device for cleaning the mud skin on the inner wall of the drill rod is characterized by comprising an outer barrel, wherein the outer barrel is of a hollow structure, the bottom of the outer barrel is sealed, and a liquid flow main channel for high-pressure liquid flow to pass through and a liquid flow branch channel which is communicated with the liquid flow main channel and can branch and guide the high-pressure liquid flow are arranged in the outer barrel; the static nozzle and the dynamic nozzle are detachably arranged on the outer cylinder and communicated with the liquid flow branch channel so as to spray high-pressure liquid flow to the inner wall of the drill rod; the high-pressure liquid flow can be sprayed out of the movable nozzle in a rotational flow mode through the rotational flow nozzle.

2. The device for cleaning the mud skin on the inner wall of the drill rod as claimed in claim 1, wherein the liquid flow branch channel is divided into an upper layer and a lower layer, and each layer of the liquid flow branch channel is uniformly arranged along the circumferential direction of the outer cylinder in a whole circle.

3. The device for cleaning the mud skin on the inner wall of the drill rod as claimed in claim 2, wherein the static nozzles are positioned at the upper part of the dynamic nozzles, the static nozzles and the dynamic nozzles are obliquely and obliquely arranged downwards, the number of the static nozzles is six, the number of the dynamic nozzles is three, and the static nozzles and the dynamic nozzles are arranged in a vertically staggered manner.

4. The device for cleaning the mud on the inner wall of the drill rod as claimed in claim 1, wherein the static nozzle and the dynamic nozzle are screwed on the outer cylinder.

5. The device for cleaning the mud skin on the inner wall of the drill rod as claimed in any one of claims 1 to 4, wherein the static nozzle comprises a basic cylindrical section, a contraction section and an outlet rectification section which are arranged in sequence; an external thread section connected with the outer barrel is arranged on the basic cylindrical section; the taper theta of the contraction section is 12-14 degrees; the ratio of the diameter a of the outlet end of the static nozzle to the diameter A of the inlet end of the static nozzle is 0.5-0.6; the outlet rectifying section is of a cylindrical structure, and the length of the outlet rectifying section is 3-4 times of the diameter a of the outlet end of the static nozzle; and a first bionic ring groove for reducing resistance and increasing speed is arranged on the surface of the inner flow passage of the static nozzle.

6. The device for cleaning the mud skin on the inner wall of the drill rod as claimed in claim 5, wherein the first bionic ring grooves are arranged in a whole circle along the circumferential direction of the surface of the inner flow passage of the static nozzle, the first bionic ring grooves are provided in a plurality and are uniformly arranged along the axial direction of the static nozzle, and the ratio of the cutting depth d to the groove width w of the first bionic ring grooves ranges from 2 to 3; the ratio range of the groove center distance D of the first bionic ring groove to the groove width w is 2.5-5.

7. The device for cleaning the mud skin on the inner wall of the drill rod according to any one of claims 1 to 4, wherein the movable nozzle comprises a frustum-shaped bionic shell, a plate-type sealing ring, a flow distribution disc, a swirl nozzle, a bionic washer and an upper joint, wherein the plate-type sealing ring, the flow distribution disc, the swirl nozzle and the bionic washer are sequentially arranged in the bionic shell, and the upper joint is screwed on the tail end of the top of the bionic shell and abuts against the plate-type sealing ring; two ends of the inner cavity of the upper joint are respectively communicated with the liquid flow branch channel and the inner cavity of the diverter tray; a liquid outlet capable of outputting liquid in an inner cavity of the flow distribution disc after the liquid is turned by 90 degrees is formed in the side wall of the flow distribution disc, and an annular clamping groove used for limiting and guiding one end of the swirl nozzle is formed in the bottom of the flow distribution disc along the circumferential direction; one side of the bionic washer, which faces the cyclone nozzle, is provided with a frustum-shaped clamping groove for limiting and guiding the other end of the cyclone nozzle, the cyclone nozzle is obliquely and eccentrically arranged between the splitter disc and the bionic washer, the cyclone nozzle is of a cylindrical rod-shaped structure and internally provided with a fluid cavity, the side wall of the cyclone nozzle is provided with a strip-shaped water inlet, and one end of the cyclone nozzle, which is close to the bionic washer, is provided with a water spray opening communicated with the water outlet of the bionic washer; the inner wall of the bionic shell is uniformly provided with second bionic convex hulls or second bionic concave pits for reducing resistance and increasing speed; third bionic pits for reducing resistance and increasing speed are uniformly arranged on the inner wall of the frustum-shaped clamping groove of the bionic washer; and a fourth bionic ring groove for reducing resistance and increasing speed is arranged on the surface of the fluid cavity of the swirl nozzle.

8. The device for cleaning the mud skin on the inner wall of the drill rod as claimed in claim 7, wherein a hemispherical positioning ball is arranged at one end of the swirl nozzle, the width and depth of the annular clamping groove are matched with the specification of the positioning ball, and the positioning ball and the annular clamping groove are in a point-surface contact structure; the other end of the swirl nozzle is of a hemispherical structure, the specification of the frustum-shaped clamping groove is matched with that of the hemispherical end of the swirl nozzle, and a surface-to-surface contact structure is arranged between the hemispherical end of the swirl nozzle and the frustum-shaped clamping groove.

9. The device for cleaning the mud skin on the inner wall of the drill rod as claimed in claim 7, wherein the fourth bionic ring grooves are arranged in a whole circle along the circumferential direction of the fluid cavity of the cyclone nozzle, the number of the fourth bionic ring grooves is multiple, the fourth bionic ring grooves are uniformly arranged along the axial direction of the cyclone nozzle, and the ratio range of the cutting depth d of each fourth bionic ring groove to the groove width w is 2-3; the ratio range of the groove center distance D of the fourth bionic ring groove to the groove width w is 2.5-5.

10. The device for cleaning mud and skin on the inner wall of the drill rod as claimed in claim 7, wherein the bionic shell is in a frustum shape, and the second bionic convex hull, the second bionic concave pit or the third bionic concave pit is a bionic non-smooth unit convex hull or concave pit which takes a convex hull on the surface of a dung beetle as a biological prototype; the area of the second bionic convex hull and the area of the second bionic concave pit account for 10-60% of the area of the inner wall of the bionic shell; the area of the third bionic pit accounts for 40-60% of the area of the inner wall of the bionic washer; the specifications of the second bionic convex hull, the second bionic concave pit or the third bionic concave pit meet the mathematical model,

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