CN106150401B - Flexible drill pipe and drilling equipment thereof - Google Patents

Flexible drill pipe and drilling equipment thereof Download PDF

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Publication number
CN106150401B
CN106150401B CN201610652426.4A CN201610652426A CN106150401B CN 106150401 B CN106150401 B CN 106150401B CN 201610652426 A CN201610652426 A CN 201610652426A CN 106150401 B CN106150401 B CN 106150401B
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China
Prior art keywords
drill rod
ball
spline
groove
shell
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CN201610652426.4A
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CN106150401A (en
Inventor
李涛
孙强
刘合
李益良
明尔扬
张绍林
韩伟业
黄守志
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China Petroleum and Natural Gas Co Ltd
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China Petroleum and Natural Gas Co Ltd
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Priority to CN201610652426.4A priority Critical patent/CN106150401B/en
Publication of CN106150401A publication Critical patent/CN106150401A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/20Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables

Abstract

The application discloses flexible drilling rod and drilling equipment, flexible drilling rod includes: the drill pipe joint comprises a first drill pipe joint, a second drill pipe joint and a plurality of drill pipe short sections which are connected end to end and are positioned between the first drill pipe joint and the second drill pipe joint; the drill pipe sub comprises: the side wall of the spline ball head is provided with a first spline; a ball head is arranged at one end of the spline ball head, and a plurality of first grooves are formed in the side wall of the ball head; the ball socket mechanism is movably connected with the spline ball head; the ball socket mechanism is provided with a spherical cavity for accommodating the ball head; a plurality of second grooves are formed in the wall of the spherical cavity; the first groove and the second groove are matched to form a plurality of rails which are arranged at intervals along the circumferential direction of the ball head; rolling balls are arranged in the tracks; the rolling ball is in contact with the walls of the first groove and the second groove; and the ball socket mechanism is provided with a second spline which can be matched with the first spline.

Description

Flexible drill pipe and drilling equipment thereof
Technical Field
The application relates to the field of oil exploitation, in particular to a flexible drill rod and drilling equipment thereof.
Background
In the oil industry, ultra-short radius sidetracking technology for simultaneously producing multiple strata in the same well is one of the major stimulation methods for oil production entering modern times.
The radial horizontal wells are divided into long radius wells, middle radius wells, short radius wells and ultra-short radius wells according to different curvature radii. The well with the long radius is provided with the curvature radius larger than 500 m, the well with the medium radius is provided with the curvature radius of 100 m to 500 m, the well with the short radius is provided with the curvature radius of 20 m to 100 m, and the well with the ultra-short radius is provided with the curvature radius of less than 20 m. Wells with shorter radii of curvature are more difficult to drill and require more drilling tools.
In the prior art, drilling tools are mainly classified into two categories, namely jet flow tools and flexible drilling tools.
A company in the United states has a technology for breaking rock and drilling by using high-pressure rotary jet, and provides technical service support on the global scale. The diameter of a horizontal well drilled by the jet flow is small, and the hole channel cut by the water flow is irregular, so that the horizontal well can not be well cemented and completed, and the hole channel is easy to close because of losing support.
Based on the jet injection principle, the Chinese patent ZL200920012340.0 discloses a high-pressure water jet injection combination tool, which comprises an injection main body and a well completion auxiliary component, wherein the injection main body comprises a spray head, a high-pressure pipe and the like, and also comprises a slotted flexible sieve tube which is sleeved outside the high-pressure pipe, a drilling tool is lifted after the injection depth reaches the designed well depth, and the slotted flexible sieve tube and a sand control sieve are both kept in a well hole formed by injection, so that the well completion is realized.
However, the slots of the slotted flexible screen pipe are perpendicular to the drilling direction of the well bore, and the slots are not regular circular arcs, so that the slots are often scraped with the well wall in a large area in the process of going down the well, and the whole set of combined tool cannot advance smoothly.
The invention patent ZL96249291.4 discloses a flexible pipe drilling tool, which comprises an elastic bent shell and a flexible drill pipe sleeved in the elastic bent shell to form a 90-degree deflecting device, wherein the main body of the elastic bent shell is a fan-shaped annular hollow connecting sheet formed by connecting elastic steel bars in series; the casing of the flexible drill pipe is a universal flexible hollow casing composed of tubular spherical connecting rings which are sequentially connected by pins. After the 90-degree deflecting device is stretched to be linearly lowered into the well, the flexible drill pipe in the deflecting device is driven to rotate, torque is transmitted to the drill bit, and drilling pressure is also transmitted to the drill bit through the elastic bent shell, so that drilling is realized.
The main inventor of the patent further improves the following Chinese invention patent ZL00258470.0 because the elastic bent shell is sleeved outside the flexible drill pipe and is easy to be eccentric and collide with the well wall, and the flexible drill is composed of a tubular elastic bent shell guide cylinder and a flexible drill rod with a rolling bearing. The lateral power of the device comes from the lateral thrust of the follow-up guide pipe, the elastic guide cylinder can drive the drill bit to turn, and the outer wall of the guide cylinder is provided with a plurality of groups of guide centralizing strips and more anti-twist limiting pieces, so that the whole guide cylinder can be bent in a set direction; and the inner side of the guide cylinder is also provided with a bendable inner spherical key and a bendable outer spherical key, and each group of spherical keys is assembled with a ball bearing, so that the flexible drill rod is not in direct contact with the inner wall of the guide cylinder, and the friction force which possibly causes the deviation of the guide cylinder is reduced.
The elastic bent shell guide cylinder is provided with a transverse slot, namely the guide cylinder is also a slotted flexible pipe and has the defects caused by the existence of the slot as described above, and the slot also destroys the strength of the original hard material guide cylinder. In addition, the righting guide strip is easy to generate friction with the well wall, and the guiding capability of the righting guide strip is questioned in the practical application process, so that the flexible drilling tool cannot be really accepted by the drilling industry.
In addition, after the flexible drill rod finishes deflecting, a drilling tool for drilling in the past needs to be lifted out, the common drill rod is connected again, then the well is lowered to the deflecting section, horizontal drilling is continued, and the drilling can be finished only by two times.
Further, chinese patent publication No. CN1464170A discloses a drilling and completion tool and a process thereof, wherein the guide follow-up screen is formed by connecting a plurality of trapezoidal pipes at one side and disconnecting the other side, although not a slotted screen, and the trapezoidal pipes are bent to the disconnected side to form a bent pipe when the inclination of 90 degrees is made. It has been found that this type of screen still does not avoid scraping against the well wall, and the great frictional resistance between the screen and the well wall for 90 ° deflection during drilling is almost impossible to advance due to the rigid bend formed by the bent ladder tubes.
It can be seen from the above background technologies that the existing ultra-short radius horizontal well drilling tools have common commonality, namely, a slotted elbow is sleeved outside a flexible drill rod or a high-pressure jetting tool, and the slotted elbow is used for 90-degree deflecting so as to lift a drilling tool after the horizontal well drilling is completed, and the slotted elbow can be kept in the well to play a role in well cementation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a flexible drill rod of an ultra-short radius radial horizontal well and drilling equipment thereof, so as to solve the defect that the flexible drill rods sleeved with slotted bent pipes cannot be smoothly put into the well in the prior art, and can drill an ultra-short radius sidetrack horizontal well.
To achieve the above object, the present application provides a flexible drill rod comprising: the drill pipe joint comprises a first drill pipe joint, a second drill pipe joint and a plurality of drill pipe short sections which are connected end to end and are positioned between the first drill pipe joint and the second drill pipe joint;
the drill pipe sub comprises:
the spline ball head extends lengthways, and a first spline is arranged on the side wall of the spline ball head; a ball head is arranged at one end of the spline ball head, and a plurality of first grooves which are distributed at intervals along the circumferential direction of the ball head are formed in the side wall of the ball head;
the ball socket mechanism is movably connected with the spline ball head; the ball socket mechanism is provided with a spherical cavity for accommodating the ball head; a plurality of second grooves which are in one-to-one correspondence with the first grooves are arranged on the wall of the spherical cavity; the first groove and the second groove are matched to form a plurality of rails which are arranged at intervals along the circumferential direction of the ball head; the track extends in an arc shape along the extension direction of the spline ball head; rolling balls are arranged in the tracks; the rolling ball is in contact with the walls of the first groove and the second groove; and the ball socket mechanism is provided with a second spline which can be matched with the first spline.
In a preferred embodiment, the ball and socket mechanism comprises a housing, a ball and socket, and an end cap; the shell is fixedly connected with the front end of the ball socket and forms the spherical cavity; the outer wall of the shell is provided with a first spherical surface structure; the rear end of the shell is connected with the end cover; the ball socket is provided with the second spline; and the rear end of the end cover is provided with a second spherical structure matched with the first spherical structure.
In a preferred embodiment, the housing is connected with the ball socket through a dowel pin, and the housing is in threaded connection with the end cover.
In a preferred embodiment, the rails are uniformly distributed along the circumferential direction of the ball head.
In a preferred embodiment, each of the tracks is provided with one rolling ball; all the rolling balls are positioned on the same plane.
In a preferred embodiment, the number of tracks is not less than 4.
In a preferred embodiment, the first spline is an external spline, and the second spline is an internal spline.
As a preferred embodiment, a sealing ring is arranged between the rolling ball and the wall of the spherical cavity, and the sealing ring is located behind the track.
In a preferred embodiment, one end of the first drill rod joint is provided with a drill rod male buckle; the other end of the first drill rod joint is provided with the ball head; the ball socket mechanism is arranged between the first drill rod joint and the drill rod short section; a back nut is fixedly sleeved outside the first drill rod joint; the back nut is in spherical contact with the shell of the ball socket mechanism.
In a preferred embodiment, one end of the second drill rod joint is provided with the ball socket and the outer shell, and the spline ball head is arranged between the second drill rod joint and the drill rod short section; and a drill rod female buckle is arranged at the other end of the second drill rod joint.
In a preferred embodiment, the bending degree of the drill pipe nipple is 4 degrees to 8 degrees.
As a preferred embodiment, the length of the flexible drill rod is 9 to 10 meters.
To achieve the above object, the present application also provides a drilling apparatus comprising:
a drill bit;
a flexible drill rod as claimed in any preceding embodiment.
It can be seen from the above description that the drilling rod nipple joint in the flexible drilling rod of this application forms the universal joint structure through the cooperation of spline bulb and ball socket mechanism to self can be crooked, thereby the drilling operation of ultrashort radius sidetracking horizontal well can be carried out in the crooked stack that a plurality of drilling rod nipple joints formed.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
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 inventive exercise.
FIG. 1 is a schematic view of a flexible drill rod according to an embodiment of the present application;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a cross-sectional view taken at B-B in fig. 1.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 3, a flexible drill rod for use in, but not limited to, drilling operations for ultra-short radius sidetrack drilling of horizontal wells is provided according to an embodiment of the present invention. In this embodiment, the flexible drill rod comprises: a first pipe joint 1, a second pipe joint 9, and a plurality of end-to-end pipe subs 100 located between the first pipe joint 1 and the second pipe joint 9.
Wherein, the pipe nipple 100 includes: the spline ball head 8 extends lengthways, and a first spline is arranged on the side wall of the spline ball head 8; a ball head is arranged at one end of the spline ball head 8, and a plurality of first grooves which are distributed at intervals along the circumferential direction of the ball head are formed in the side wall of the ball head; the ball socket mechanism is movably connected with the spline ball head 8; the ball socket mechanism is provided with a spherical cavity for accommodating the ball head; a plurality of second grooves which are in one-to-one correspondence with the first grooves are arranged on the wall of the spherical cavity; the first groove and the second groove are matched to form a plurality of rails 10 which are arranged at intervals along the circumferential direction of the ball head; the track 10 extends along the extension direction of the spline ball head 8 in an arc shape; rolling balls 4 are arranged in the track 10; the rolling ball 4 is in contact with the walls of the first groove and the second groove; and the ball socket mechanism is provided with a second spline which can be matched with the first spline.
When a plurality of drill pipe joints 100 are connected end to form a flexible drill pipe, as shown in fig. 1, a spline ball 8 of one drill pipe joint 100 extends into a ball socket mechanism from the rear end of the previous drill pipe joint 100, so that a first spline of the drill pipe joint 100 is matched with a second spline of the previous drill pipe joint 100, and transmission is performed; similarly, when this drill pipe sub 100 is connected with the latter drill pipe sub 100, the spline ball 8 of the latter drill pipe sub 100 is extended into its ball-and-socket mechanism from the rear end of this drill pipe sub 100, so that the first spline of the latter drill pipe sub 100 is matched with the second spline of this drill pipe sub 100, thereby performing transmission.
It can be seen from the above description that the drill pipe pup joint 100 forms a universal joint structure through the matching of the spline ball head 8 and the ball socket mechanism, so that the drill pipe pup joint can be bent, and the bends formed by the drill pipe pup joints 100 are overlapped, so that the drilling operation of ultra-short radius side drilling horizontal wells can be performed.
Through flexible drilling rod and with flexible drilling rod adopt universal swing joint's drill bit, form a whole flexible chain, this kind of flexible chain is different with traditional crack elbow, the stand pipe that includes a plurality of trapezoidal pipe constitutions. The traditional gap bent pipe can be bent to be an approximately 900 bent pipe only in one direction, the bent pipe does not show flexibility after being bent, but becomes a section of rigid bent pipe, once the outer edge of the rigid bent pipe is rubbed with the inner side of a well wall, the rigid bent pipe cannot be arched inwards by itself to avoid obstacles.
In reverse view of the flexible drill rod of the embodiment, because each section of the drill rod short section 100 is movably connected with the ball socket mechanism in a universal joint mode through the spline ball head 8, when any section of the drill rod short section 100 collides with a well wall, the section of the drill rod short section 100 can be properly bent, so that obstacles are avoided, and a drill rod drill bit can smoothly run downwards without obstacles. For the flexible casing for well cementation, two adjacent sections of flexible casings are movably connected through the hinged telescopic pipe, and the flexible casings can be ensured to smoothly descend to a required position along a drilling well.
It should be noted that, in the present application, the front and rear directions are referred to as the first tool joint 1, and the part of the two parts close to the first tool joint 1 is in front and the part far from the rear of the coring bit 1 is in rear; for example, the direction from the first drill pipe joint 1 to the second drill pipe joint 9 is a front-to-rear direction.
With continued reference to fig. 1, the splined ball 8 extends lengthwise and is generally of a tubular construction. The first spline is arranged at the middle position of the spline ball 8 in the length direction. The ball head is located behind the first spline (with the reader facing fig. 1).
The spherical cavity of the ball and socket mechanism can receive the spline ball 8. Wherein, spherical cavity and bulb are concentric setting to spline bulb 8 can carry out universal swing, thereby forms bending angle. The outer surface of the ball head is in contact with the inner surface of the spherical cavity in a fitting manner.
As shown in fig. 1 and 2, the first groove formed in the outer wall of the ball head and the second groove formed in the wall of the spherical cavity both extend in the extending direction of the spline ball head 8 (or from top to bottom as shown in fig. 1) in an arc shape, and the arc shape of the first groove and the second groove matches with the contour line of the ball head or the spherical cavity. As shown in fig. 2, the first and second grooves are each semi-circular in cross-section such that the openings abut to form the track 10.
In particular, the ball and socket mechanism may include a housing 3, a socket 6, and an end cap 7. The shell 3 is fixedly connected with the front end of the ball socket 6 and forms the spherical cavity. The outer wall of the shell 3 is provided with a first spherical structure. The rear end of the shell 3 is connected with the end cover 7; the ball socket 6 is provided with said second splines. And a second spherical structure matched with the first spherical structure is arranged at the rear end of the end cover 7.
The outer shell 3, the ball socket 6 and the end cap 7 are all of a sleeve structure or a tubular structure as shown in fig. 1, so that a drill pipe nipple 100 formed with the spline ball head 8 has a central flow passage. The housing 3, the ball socket 6 and the end cap 7 are arranged in sequence from top to bottom as shown in fig. 1. The shell 3 and the ball socket 6 are matched to form a spherical cavity, the groove on the inner wall of the shell 3 provides a second groove with partial length, the groove on the inner wall of the ball socket 6 provides a second groove with the other partial length, and the second groove with the partial length on the shell 3 and the second groove with the other partial length on the ball socket 6 are butted up and down to form a second groove.
As shown in fig. 1, the front end of the end cap 7 is interposed between the housing 3 and the ball socket 6, and a step is formed on the wall of the end cap 7 to abut against the rear end of the housing 3 and the rear end of the ball socket 6. The second spherical structure is arranged at the rear end of the end cover 7 and is an inner spherical surface. The first spherical structure is arranged on the outer wall of the shell 3 and is an outer spherical surface. First spherical structure and the contact of laminating mutually of second spherical structure are for the relative swing between spline bulb 8 and the ball socket mechanism is led supplementaryly, simultaneously, avoid the foul to get into the activity sphere between ball socket 6 and the bulb.
As shown in fig. 3, the ball and socket 6 is provided with a second spline, which is an internal spline and which mates with the first spline (of the next pipe sub 100). Wherein, the second spline is positioned at the rear part of the spherical cavity. The spline ball 8 and the ball socket mechanism are in spline fit, and can slide relatively to keep torque transmission, so that bending is generated between two adjacent drill pipe nipples 100.
Further, the housing 3 and the socket 6 are connected by a locating pin 5, so that relative rotation between the housing 3 and the socket 6 is prevented. The housing 3 is in threaded connection with the end cap 7. The rails 10 are uniformly distributed along the circumference of the ball head. Each of the tracks 10 is provided with one of the rolling balls 4. All the rolling balls 4 are positioned on the same plane, so that bending of the drill pipe nipple 100 can be met, and torque can be transmitted well. The number of the rails 10 is not less than 4. As shown in fig. 2, the number of the rails 10 is 8, and the number of the rolling balls 4 is also 8. The first spline is an external spline, and the second spline is an internal spline. And a sealing ring is arranged between the rolling ball 4 and the wall of the spherical cavity and is positioned behind the track 10.
In one embodiment, the first tool joint 1 is also movably connected to the pipe sub 100, and the second tool joint 9 is also movably connected to the pipe sub 100.
Specifically, as shown in fig. 1, one end of the first drill rod joint 1 is provided with a drill rod male buckle. The other end of the first drill rod joint 1 is provided with the ball head. The ball-and-socket mechanism is arranged between the first drill rod joint 1 and the drill rod sub 100. The first drill rod joint 1 is fixedly sleeved with a back nut 2. The back nut 2 is in spherical contact with the housing 3 of the ball and socket mechanism.
Further, as shown in fig. 1, one end of the second drill rod joint 9 is provided with the ball socket 6 and the housing 3, and the spline ball 8 is arranged between the second drill rod joint 9 and the drill rod sub 100; and a drill rod female buckle is arranged at the other end of the second drill rod joint 9.
In the present embodiment, the pipe nipple 100 may be bent, that is, a relative swing is generated between the ball-and-socket mechanism and the spline ball 8. Preferably, the bending degree of the pipe nipple 100 is 4 degrees to 8 degrees. By the arrangement, the drilling operation of ultra-short radius sidetrack horizontal well or highly-deviated well with the deflecting radius of 1.5-2 meters can be smoothly completed in 51/2' (5 inch and half) wells. Specifically, the length of the flexible drill rod may be 9 to 10 meters.
An embodiment of the present application also provides a drilling apparatus, comprising: a drill bit; a flexible drill rod as claimed in any preceding embodiment.
Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.
Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.
All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.
A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed subject matter.

Claims (11)

1. A flexible drill rod, comprising: the drill pipe joint comprises a first drill pipe joint, a second drill pipe joint and a plurality of drill pipe short sections which are connected end to end and are positioned between the first drill pipe joint and the second drill pipe joint;
the drill pipe sub comprises:
the spline ball head extends lengthways, and a first spline is arranged on the side wall of the spline ball head; a ball head is arranged at one end of the spline ball head, and a plurality of first grooves which are distributed at intervals along the circumferential direction of the ball head are formed in the side wall of the ball head;
the ball socket mechanism is movably connected with the spline ball head; the ball socket mechanism is provided with a spherical cavity for accommodating the ball head; a plurality of second grooves which are in one-to-one correspondence with the first grooves are arranged on the wall of the spherical cavity; the first groove and the second groove are matched to form a plurality of rails which are arranged at intervals along the circumferential direction of the ball head; the track extends in an arc shape along the extension direction of the spline ball head; rolling balls are arranged in the tracks; the rolling ball is in contact with the walls of the first groove and the second groove; the ball socket mechanism is provided with a second spline which can be matched with the first spline;
the ball socket mechanism comprises a shell, a ball socket and an end cover; the shell is fixedly connected with the front end of the ball socket and forms the spherical cavity; the outer wall of the shell is provided with a first spherical surface structure; the rear end of the shell is connected with the end cover; the ball socket is provided with the second spline; the rear end of the end cover is provided with a second spherical structure matched with the first spherical structure;
the shell is connected with the ball socket through a positioning pin, and the shell is in threaded connection with the end cover;
the groove on the inner wall of the shell provides a second groove with partial length, the groove on the inner wall of the ball socket provides a second groove with the other partial length, and the second groove with partial length on the shell and the second groove with the other partial length on the ball socket are butted up and down to form the second groove; the front end of the end cover is clamped between the shell and the ball socket, and a step for supporting the rear end of the shell and the rear end of the ball socket is formed on the wall of the end cover.
2. The flexible drill rod of claim 1, wherein: the tracks are uniformly distributed along the circumferential direction of the ball head.
3. The flexible drill rod of claim 1, wherein: each track is internally provided with one rolling ball; all the rolling balls are positioned on the same plane.
4. The flexible drill rod of claim 3, wherein: the number of the tracks is not less than 4.
5. The flexible drill rod of claim 1, wherein: the first spline is an external spline, and the second spline is an internal spline.
6. The flexible drill rod of claim 1, wherein: and a sealing ring is arranged between the rolling ball and the wall of the spherical cavity and is positioned behind the track.
7. The flexible drill rod of claim 1, wherein: one end of the first drill rod joint is provided with a drill rod male buckle; the other end of the first drill rod joint is provided with the ball head; the ball socket mechanism is arranged between the first drill rod joint and the drill rod short section; a back nut is fixedly sleeved outside the first drill rod joint; the back nut is in spherical contact with the shell of the ball socket mechanism.
8. The flexible drill rod of claim 1, wherein: one end of the second drill rod joint is provided with the ball socket and the shell, and the spline ball head is arranged between the second drill rod joint and the drill rod short section; and a drill rod female buckle is arranged at the other end of the second drill rod joint.
9. The flexible drill rod of claim 1, wherein: and the bending degree of the drill rod short section is 4-8 degrees.
10. The flexible drill rod of claim 1, wherein: the length of the flexible drill rod is 9-10 meters.
11. A drilling apparatus, comprising:
a drill bit;
a flexible drill rod as claimed in any one of claims 1 to 10.
CN201610652426.4A 2016-08-10 2016-08-10 Flexible drill pipe and drilling equipment thereof Active CN106150401B (en)

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CN106150401A CN106150401A (en) 2016-11-23
CN106150401B true CN106150401B (en) 2020-01-07

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CN107676040B (en) * 2017-10-12 2020-05-08 中国石油天然气股份有限公司 Shell guide type deflecting drilling tool
CN107869312A (en) * 2017-10-12 2018-04-03 中国石油天然气股份有限公司 Flex-stem
CN110567623B (en) * 2019-08-31 2021-03-09 中国石油集团川庆钻探工程有限公司 Method for determining installation position of hydraulic oscillator on drilling tool

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CN204457433U (en) * 2014-10-29 2015-07-08 中国石油天然气股份有限公司 Anti-oblique combination drill tool

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CN201705216U (en) * 2010-05-31 2011-01-12 中国石油天然气股份有限公司 Clamping spring type fishable bottom plug for expansion pipe
CN202047748U (en) * 2011-04-19 2011-11-23 北京百利时能源技术有限责任公司 Ultra short radius horizontal well flexible drilling tool
CN204457433U (en) * 2014-10-29 2015-07-08 中国石油天然气股份有限公司 Anti-oblique combination drill tool

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