CN214886905U

CN214886905U - Short section of drill rod for drilling of tandem type horizontal well

Info

Publication number: CN214886905U
Application number: CN202022943808.7U
Authority: CN
Inventors: 刘显涛; 王思敏; 郭相龙; 张淼
Original assignee: Jilin Petroleum Equipment & Technology Engineering Service Co ltd
Current assignee: Jilin Petroleum Equipment & Technology Engineering Service Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-11-26
Anticipated expiration: 2030-12-10

Abstract

The invention discloses a short section of a tandem type drill rod for drilling a horizontal well, which comprises a positioning ring (4) arranged at the front part of a female joint (8), a male joint (2) with a straight rod section at the front part and a ball head at the rear part, wherein the ball head is positioned in a ball cavity formed by the front end surface of the female joint (8) and the upper end surface of the positioning ring (4); the outer shell (3) is sleeved on the straight rod section of the male joint (2) and extends to be in threaded connection with the female joint (8) after a clamping end cover is formed at the ball head; bulges are arranged at intervals on the periphery of the ball head in the circumferential direction, and groove bodies for accommodating the bulges are arranged on the inner wall of the outer shell (3) in the circumferential direction at intervals; the male connector (2) and the female connector (8) are provided with through center holes; a rolling component is sleeved on any peripheral face ring section of the outer shell (3) or the female joint (8). The assembly difficulty between each part of the drill rod is reduced through structural design, the problem that the friction torque of the drill rod is large in the drilling process is solved, and the working efficiency is improved.

Description

Short section of drill rod for drilling of tandem type horizontal well

Technical Field

The invention relates to the field of processing and manufacturing of drill rod accessory equipment for horizontal well drilling, in particular to a pup joint of a tandem type drill rod for horizontal well drilling.

Background

Horizontal wells are special wells having a maximum well deviation angle of up to or near 90 (typically no less than 86) and maintaining a horizontal well section of a certain length in the zone of interest. Sometimes the angle of inclination may exceed 90 deg., for certain special needs, "upturned". Generally, horizontal wells are suitable for thin or fractured hydrocarbon reservoirs with the aim of increasing the exposed area of the hydrocarbon reservoir. In the process of drilling, in order to adapt to the operation that the drill rod should rotate a certain angle to the trend of the well wall, a guide sleeve is synchronously arranged outside the drill rod in the prior art to overcome the resistance of the well wall and ensure the stable drilling.

The closest prior art to the present invention is an invention patent with application number 201611013316X, named horizontal well drilling tool, which discloses a horizontal well drilling tool, 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 ball head mechanism extends lengthways, and a first connecting part is arranged on the side wall of the ball head mechanism; a ball head is arranged at one end of the ball head mechanism, and a plurality of track grooves which are distributed at intervals along the circumferential direction of the ball head are arranged on the side wall of the ball head; the ball socket mechanism is movably connected with the ball head mechanism; the ball socket mechanism is provided with a spherical cavity for accommodating the ball head; a plurality of pin holes which are in one-to-one correspondence with the track grooves are formed in the wall of the spherical cavity; a pin partially extending into the track groove is arranged in the pin hole; the pin is in contact with the inner wall of the track groove; the ball socket mechanism is provided with a second connecting part which can be matched with the first connecting part. The problem with this patent is that: the drill rod short section is troublesome to replace as a loss part in a drill rod, a pin in a track groove of a ball head is easy to damage through end cover limiting, the ball socket is connected into a whole and cannot be assembled, and the outer thread section of the second spherical structure formed by extending the rear part of the first ball socket is difficult to machine. The difficulty of large friction torque borne by the drill rod still exists in the drilling process along with the continuous increase of the number of horizontal wells and the length of the horizontal section.

Disclosure of Invention

The invention aims to simplify the replacement mode of the drill rod, reduce the assembly difficulty among all parts of the drill rod through structural design, solve the problem of large friction torque of the drill rod in the drilling process and improve the working efficiency.

In order to achieve the aim, the invention provides a short section of a tandem type horizontal well drilling drill rod, which comprises a male joint, an outer shell and a female joint, wherein the front part of the male joint is a straight rod section, the rear part of the male joint is a ball head, the outer shell is sleeved outside the tail end of the straight rod section of the male joint, an annular end cover is formed at the front end of the ball head to clamp the ball head, and the rear end of the outer shell is screwed with the female joint through internal threads; the front end of the female joint is provided with a positioning ring, and the female joint and the positioning ring form a ball cavity for accommodating the rear part of the ball head of the male joint.

The bulb of public joint is provided with the arch at the interval in longitudinal section's circumference, the shell body corresponds the interval and is equipped with the holding bellied cell body, the preceding terminal surface of holding ring and each the cell body of shell body corresponds and blocks each the arch of public joint bulb.

The female joint is provided with internal threads, and external threads are arranged corresponding to the straight rod section of the male joint and are used for connecting short sections in sequence; the short section is provided with a central hole penetrating through the male connector at the front part and the female connector at the rear part; and a rolling component is sleeved on any peripheral surface ring section of the outer shell or the female joint.

In order to meet the rotating strength requirement of the male connector in the working process and facilitate the assembly between the female connector and the outer shell, preferably, an annular positioning groove for clamping the positioning ring is arranged in the outer shell.

The rear part of the ball head is high in assembly requirement, in order to avoid the influence of the positioning ring of the whole structure on assembly precision, the positioning ring is preferably arranged in a segmented mode, and an assembly opening is formed between the two adjacent positioning ring segments.

Under the working condition that the inner diameter of the horizontal well wall has a limitation requirement, the smaller the integral maximum outer diameter of the drill rod is, the better, and one preferable mode is as follows: and a rolling component sleeved on the peripheral surface of the female joint is reserved between the tail flange of the female joint and the outer shell, and the rolling component comprises a bearing outer sleeve and rolling bodies between the female joint and the bearing outer sleeve.

In the process of drilling the horizontal well, the male joint straight rod section is in universal motion around the axial direction relative to the outer shell, and one preferable mode is as follows: and a movable gap is reserved at the sleeving position of the inner wall of the outer shell and the outer wall of the straight rod section of the male connector, so that the straight rod section of the male connector is ensured to be opposite to the outer shell to form bending.

The shell body is screwed with the external thread of the female joint through the internal thread, enough force needs to be applied to tighten the shell body, and in order to facilitate force application, one preferable mode is as follows: and milling planes are also arranged on the peripheral ring section of the outer shell at intervals.

In the process of drilling the horizontal well, the male joint straight rod section is in universal motion around the axial direction relative to the outer shell, and one preferable mode is as follows: the lower part of the ball head bulge is arc-shaped, and a movable gap is arranged between the radial end of the ball head bulge and the corresponding contact surface of the outer shell groove body. Can guarantee the bulb is protruding to be in smooth motion and prevent to produce the card phenomenon of dying because of local uneven extrusion deformation of atress in the shell body cell body, make the bulb protruding with the body cell body is processed more easily.

Horizontal well creeps into the in-process, can let in drilling fluid in the drilling rod nipple joint, in order to prevent that dirty and drilling fluid get into bulb and the intracavity of ball influence bending movement, an preferred mode is: and the short section is provided with a sealing ring at the front end of the straight rod section of the central hole male joint and on the front end surface of the female joint.

Drawings

FIG. 1 is a schematic front view and a half-section structure of a pup joint of the drill rod for drilling the tandem horizontal well.

FIG. 2 is a schematic front view and a half-section structure of a pup joint of the drill rod for drilling the tandem horizontal well.

Fig. 3 is a schematic cross-sectional view at a-a of fig. 2.

Fig. 4 is a schematic front view and a half-section structure of a pup joint outer shell of the drill rod for drilling the tandem horizontal well.

Fig. 5 is a schematic cross-sectional view at B-B of fig. 4.

FIG. 6 is a schematic side view and a half-section structure of the pup joint positioning ring of the drill rod for drilling the tandem horizontal well.

Fig. 7 is a front view structural schematic diagram of a pup joint positioning ring of the drill rod for drilling the tandem horizontal well.

Fig. 8 is a schematic front view structural diagram of a nipple bearing outer sleeve of the drill rod for drilling the tandem horizontal well according to the present invention.

Fig. 9 is a schematic front view structural diagram of a short section rolling body of the drill rod for drilling the tandem horizontal well according to the present invention.

Fig. 10 is a schematic side-view half-section structure view of the pup joint positioning ring of the drill rod for drilling the tandem horizontal well.

Fig. 11 is a schematic view of a semi-section structure of a plurality of short sections of the drill rod for drilling the tandem horizontal well, which are connected in series.

Wherein: 1. the sealing device comprises a first sealing ring, 2, a male connector, 3, an outer shell, 4, a positioning ring, 5, a second sealing ring, 6, a bearing outer sleeve, 7, a rolling body, 8 and a female connector.

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.

Example (b):

as shown in figure 1, the pup joint of the drill rod for drilling the tandem-type horizontal well comprises a male joint 2, wherein the front part of the male joint is a straight rod section, the rear part of the male joint is a ball head, a shell body 3 which is sleeved outside the tail end of the straight rod section of the male joint 2 and is clamped by an annular end cover formed at the front end of the ball head, and a female joint 8 which is screwed at the rear end of the shell body 3 through internal threads. The outer shell 3 inner wall with the outer wall of the straight pole section of the male joint 2 cup joints the department and leaves the activity clearance, specifically speaking, the outer shell 3 inner wall with the outer wall of the straight pole section of the male joint 2 cup joints the department and is the horn mouth form that enlarges gradually. And milling planes are also arranged on the peripheral ring section of the outer shell 3 at intervals. The fastening of the sleeving tool is convenient.

If the female joint 8 forms a spherical cavity structure alone, the female joint 8 is in threaded connection with the outer shell 3, and due to the limitation of machining precision and assembly conditions, a gap must exist at the contact position of the female joint 8 and the outer shell 3, so that the female joint 8 cannot be tightly propped against the male joint 2 in the use process of the serially connected short joints. Therefore, a positioning ring 4 is arranged at the front end of the female joint 8, and as shown in fig. 1 and 4-7, the female joint 8 and the positioning ring 4 jointly form a ball cavity for accommodating the rear part of the ball head of the male joint 2. And an annular positioning groove corresponding to the positioning ring 4 is arranged in the outer shell 3 and plays a role in radially limiting the positioning ring 4.

In order to facilitate the positioning ring 4 to be assembled in the annular positioning groove, the positioning ring 4 is divided into three sections, the positioning ring 4 is assembled between two adjacent positioning ring sections in a subsection mode, an assembling opening is formed in the positioning ring 4, and the assembling opening is an inclined opening formed in the contact position of two adjacent parts. After the assembly is finished, the positioning ring 4 is in close contact with the spherical surface at the rear part of the ball head of the male joint 2, and the assembly requirement of the female joint 8 and the outer shell is met;

as shown in fig. 1 to 3, the ball head of the male connector 2 is provided with protrusions at intervals in the circumferential direction of the longitudinal section, the outer shell 3 is provided with groove bodies for accommodating the protrusions at intervals, and the front end surface of the positioning ring 4 and each groove body of the outer shell 3 correspondingly clamp the protrusions of the ball head of the male connector 2. The female joint 8 is provided with internal threads, and external threads are arranged on the straight rod section corresponding to the male joint 2 and used for the sequential connection of short sections; the short section is provided with a central hole penetrating through the male connector 2 at the front part and the female connector 8 at the rear part; and a rolling component is sleeved on any peripheral surface ring section of the outer shell 3 or the female joint 8. The bellied lower part of bulb is the arcuation and its radial end with correspond 3 cell bodies of shell body with there is the clearance between the contact surface of holding ring 4, and this clearance is the bulb of male joint 2 is in shell body 3 with the spherical intracavity swing that holding ring 4 and female joint 8 formed provides the space, and can guarantee the bulb is protruding to be in move smoothly in the shell body cell body and prevent to produce the card phenomenon of dying because of the uneven extrusion deformation of local atress, make the bulb protruding with the cell body of shell body 3 is processed more easily.

As shown in fig. 11, the female joint 8 of the previous short joint is in threaded connection with the straight rod section of the male joint 2 of the next adjacent short joint.

The short section is provided with a sealing ring on the front end of the straight rod section of the central hole male joint 2 and the front end surface of the female joint 8, and the sealing ring is a first sealing ring 1 and a second sealing ring 5 respectively.

The cross section of the ball head at the bulge is shown in figure 3, the cross section of the groove body is shown in figure 5, the cross section of the ball head and the groove body are of spline structures, the bulges arranged on the periphery of the ball head are equivalent to internal splines, and the groove body is equivalent to external splines.

And a rolling component is sleeved on any peripheral surface ring section of the outer shell 3 or the female joint 8. As shown in fig. 9, the rolling elements 7 are needle rollers to increase the rolling surface.

As shown in fig. 1 and 8, a rolling assembly sleeved on the outer peripheral surface of the female joint 8 is left between the tail flange of the female joint 8 and the outer housing 3, and the rolling assembly includes the bearing outer sleeve 6 and rolling bodies between the female joint 8 and the bearing outer sleeve 6. In the process of drilling a horizontal well, the bearing outer sleeve 6 and the wall of a drilled hole are relatively kept static, and the whole of the male joint 2, the female joint 8 and the outer shell 3 rotates relative to the bearing outer sleeve 6 through the rolling body 7 to complete a drilling task. The combination of the bearing outer sleeve 6 and the rolling body 7 reduces the friction torque of the short section per se and improves the working efficiency.

The technical requirements relating to the components in the examples are as follows:

the technical requirements of the male connector 2 are as follows:

1. quenching and tempering: HB is 280-310 of the total weight of the alloy,

2. and (3) no chamfering: 0.5 multiplied by 45 degrees, the other edges and corners are blunt,

3. surface ion nitriding treatment: the thickness is 0.15 to 0.2.

Technical requirements of the outer shell 3:

1. quenching and tempering: HB is 280-310 of the total weight of the alloy,

3. surface ion nitriding treatment: the thickness is 0.15 to 0.2.

Technical requirements of the positioning ring 4:

1. quenching and tempering: HB is 350-380

2. And (3) no chamfering: 0.5X 45 degrees, and the other edges and corners are blunt

3. Surface ion nitriding treatment

Technical requirements of the female joint 8:

1. quenching and tempering: HB is 280-310 of the total weight of the alloy,

3. and (5) performing surface ion nitriding treatment.

The technical requirements of the bearing sleeve 8 are as follows:

1. quenching and tempering: HB is 350 to 380,

2. chamfering edges: 0.3X 45 degrees,

3. and (5) performing surface ion nitriding treatment.

Technical requirements of the rolling elements 7:

the finished parts are purchased according to GB/T309 and 2000 rolling bearing needle.

The assembling method of the invention is that a straight rod section of the male joint 2 penetrates into the outer shell 3, then the upper cambered surface of the positioning ring 4 is placed towards the ball head of the male joint 2, and after the bearing sleeve 8 is sleeved outside the female joint 8, the front end of the female joint 8 extends into the outer shell 3 and is screwed with the internal thread of the outer shell 3 through the external thread.

As shown in FIG. 11, a plurality of drill pipe short sections are connected in series and are screwed with the internal threads of the female joint 8 through the external threads of the straight section of the male joint 2.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims

1. The nipple of the drill rod for drilling the tandem horizontal well is characterized by comprising a male joint (2) with a straight rod section at the front part and a ball head at the rear part, an outer shell (3) which is sleeved outside the tail end of the straight rod section of the male joint (2) and forms an annular end cover at the front end of the ball head to clamp the ball head, and a female joint (8) which is screwed at the rear end of the outer shell (3) through internal threads;

a positioning ring (4) is arranged at the front end of the female joint (8), and a ball cavity for accommodating the rear part of the ball head of the male joint (2) is formed by the female joint (8) and the positioning ring (4); the ball head of the male joint (2) is provided with bulges at intervals in the circumferential direction of the longitudinal section, the outer shell (3) is correspondingly provided with groove bodies for accommodating the bulges at intervals, and the front end surface of the positioning ring (4) and the groove body of each outer shell (3) are correspondingly clamped with the bulges of the ball head of each male joint (2);

the female joint (8) is provided with internal threads, and external threads are arranged corresponding to the straight rod section of the male joint (2) and used for connecting short sections in sequence; the short section is provided with a central hole penetrating through the male connector (2) at the front part and the female connector (8) at the rear part;

and a rolling component is sleeved on any peripheral surface ring section of the outer shell (3) or the female joint (8).

2. The pup joint of the drill rod for drilling the tandem horizontal well according to claim 1, wherein an annular positioning groove for clamping the positioning ring (4) is formed in the outer shell (3).

3. The pup joint of the drill rod for drilling the tandem horizontal well according to claim 1, wherein the positioning rings (4) are arranged in sections, and an assembly opening is formed between the two adjacent positioning rings (4).

4. The pup joint of the tandem horizontal well drilling rod according to claim 1, wherein a rolling assembly sleeved on the outer peripheral surface of the female joint (8) is reserved between the tail flange of the female joint (8) and the outer shell (3), and the rolling assembly comprises a bearing outer sleeve (6) and rolling bodies between the female joint (8) and the bearing outer sleeve (6).

5. The pup joint of the drill rod for drilling the tandem horizontal well according to claim 1, wherein a movable gap is reserved at the joint of the inner wall of the outer shell (3) and the outer wall of the straight rod section of the male joint (2).

6. The pup joint of the drill rod for drilling the tandem horizontal well according to claim 1 or 4, wherein the outer ring section of the outer shell (3) is further provided with milling planes at intervals.

7. The sub of the tandem horizontal well drilling rod according to claim 1, characterized in that the lower part of the ball nose is arc-shaped and a movable gap is formed between the radial end of the ball nose and the contact surface of the corresponding groove body of the outer shell (3).

8. The pup joint of the drill rod for drilling the tandem horizontal well according to claim 1, wherein the pup joint is provided with sealing rings at the front end of the straight rod section of the central hole male joint (2) and the front end surface of the female joint (8).