CN202731765U - Cone Butt Double Shoulder Tool Joint - Google Patents

Abstract

The conical surface butt joint double-shoulder drilling tool joint is applied to drilling tools in oil field wells and oil extraction wells. The main shoulder is provided with a first conical surface, a thread and a second conical surface in sequence from the main shoulder to the top end of the external thread end; the conicity of the first conical surface, the thread and the second conical surface is consistent; the vertical length of the first conical surface is 38.1mm, the vertical length of the second conical surface is 28.57mm, threads are arranged between the first conical surface and the second conical surface, the first conical surface is in transition connection with the thread crest of the threads, and the second conical surface is in transition connection with the thread root of the threads; the radius of a transition circular arc between the main shoulder and the first conical surface is 3mm, and the radius of a transition circular arc between the auxiliary shoulder and the second conical surface is 3 mm. The effect is as follows: compared with the common double-shoulder drilling tool joint, the conical surface butt joint double-shoulder drilling tool joint has the advantages that the notch sensitivity coefficient of the thread part is reduced, the torsion resistance and the bending resistance are obviously improved, the structure is simple, and the processing is easy.

Description

Cone Butt Double Shoulder Tool Joint

technical field

The utility model relates to the technical field of drilling and oil production in oil fields, in particular to a downhole drilling tool for drilling and production, which is a double-shoulder drilling tool joint with conical surfaces.

Background technique

At present, the threaded joints of drilling tools used in oil and gas fields are generally API standard threads, and the thread angle of this thread is 60 degrees. And the research unit increased the torsional strength of the drilling tool by adding an auxiliary shoulder with the same structure as the main shoulder at the small end of the threaded connection, which achieved certain results when used in the vertical well section, but in the horizontal section, lateral well section, etc. In the complex drilling process, due to the more complex force, especially under the action of bending load, the rigidity of the double-shouldered drilling tool is relatively high, and the internal and external threads are prone to breakage.

Utility model content

The purpose of this utility model is: to provide a double-shoulder drilling tool joint with a conical surface, which can reduce the sensitivity coefficient of the double-shoulder thread gap, improve the bending resistance and torsional strength of the thread, and mainly solve the problems caused by the existence of internal and external threads in existing products. Defects, high rigidity, low flexibility, and limited bending and torsional performance can effectively improve the bending and torsional performance of double-shoulder drill joints, and improve the strength and service life of double-shoulder drilling tools as a whole; The tight combination between the cone surfaces improves the sealing performance of the threaded part and reduces the notch sensitivity coefficient of the threaded part.

The technical scheme adopted by the utility model is: the taper-faced double-shoulder drill joint includes a joint body, an external thread end and an internal thread end, and there are external thread ends and internal thread ends at the two ends of the joint body; There is a ring-shaped main shoulder at the root of the end, and the plane of the ring-shaped main shoulder is perpendicular to the centerline of the tool joint; there is a ring-shaped secondary shoulder at the root of the internal thread end, and the plane of the ring-shaped secondary shoulder is perpendicular to the center line of the tool joint; It is characterized in that: from the main shoulder to the top of the external thread end, there are first conical surface, thread and second conical surface in sequence; the taper of the first conical surface, thread and second conical surface is consistent; the vertical length of the first conical surface is 38.1mm , the vertical length of the second conical surface is 28.57mm, there is a thread between the first conical surface and the second conical surface, the first conical surface is transitionally connected to the crest of the thread, and the second conical surface is transitionally connected to the bottom of the thread; the main The radius of the transition arc between the shoulder and the first conical surface is 3mm, and the radius of the transition arc between the secondary shoulder and the second conical surface is 3mm.

The profile half angle of the thread is 37.5 degrees, the profile height is 2.5 mm, and the crest height is 1.076 mm.

Beneficial effects of the utility model: the utility model taper-faced double-shoulder drill joint, compared with the common double-shoulder drill joint, reduces the notch sensitivity coefficient of the threaded part, The torsional and bending strength are significantly improved, and the structure is simple and easy to process.

Description of drawings

Figure 1 is a schematic cross-sectional view of the connection structure of the taper-faced double-shoulder tool joint of the utility model.

In the figure, 1-external thread end, 2-internal thread end, 3-main shoulder, 4-first conical surface, 5-thread, 6-second conical surface, 7-secondary shoulder.

Detailed ways

Embodiment 1: Taking a taper-faced double-shoulder drill joint as an example, the utility model is further described in detail.

See Figure 1. Figure 1 is a schematic diagram of the connection of two tapered double-shoulder tool joints. The double-shouldered drill tool joint with tapered surface includes a joint body, an external thread end 1 and an internal thread end 2. There are an external thread end 1 and an internal thread end 2 at both ends of the joint body respectively.

There is an annular main shoulder 3 at the root of the external thread end 1, and the plane of the annular main shoulder 3 is perpendicular to the center line of the tool joint; there is an annular secondary shoulder 7 at the root of the internal thread end 2, and the annular secondary shoulder 7 The plane is perpendicular to the tool joint centerline. From the main shoulder 3 to the top of the external thread end 1, there are first conical surface 4, thread 5 and second conical surface 6; the first conical surface 4, thread 5 and second conical surface 6 have the same taper; the first conical surface The vertical length of 4 is 38.1mm, the vertical length of the second conical surface 6 is 28.57mm, between the first conical surface 4 and the second conical surface 6 is the thread 5, the half angle of the thread 5 is 37.5 degrees, and the height of the thread 2.5mm, crest height 1.076mm. The transitional connection between the first conical surface 4 and the top of the thread 5, and the transitional connection between the second conical surface 6 and the bottom of the thread 5; the radius of the transition arc between the main shoulder 3 and the first conical surface 4 is 3 mm, and the secondary shoulder 7 The radius of the transitional arc with the second conical surface 6 is 3 mm.

The structure of the utility model can be processed in the following manner: first, a secondary shoulder 7 is added to the small end of the inner and outer threaded ends of the drilling tool, then the main shoulder 3 is processed, and the first conical surface 4 is processed at the large end of the thread, and the taper is threaded. In the taper direction, the length is 38.10mm; when processing external threads, turn the thread 5 from the top of the thread to the auxiliary shoulder 7, and turn the second conical surface from the bottom of the thread at a distance of 28.57mm from the surface of the auxiliary shoulder 7; When threading, stop at the distance of 28.57mm from the thread bottom turning thread to the auxiliary shoulder 7, and turn out the second conical surface from the top of the internal thread; the second conical surface and the auxiliary shoulder 7 have an arc transition, and the transition fillet radius is 3mm.

Claims (2)

1. a conical surface docking double shoulder tool joint comprises joint body, male end (1) and female end (2), and male end (1) and female end (2) are arranged respectively at the two ends of joint body; Root in male end has annular main shoulder (3), and main shoulder (3) plane of annular is vertical with the tool joint center line; Root in female end (2) has the slave station of annular to take on (7), and slave station shoulder (7) plane of annular is vertical with the tool joint center line; It is characterized in that: main shoulder (3) has the first taper seat (4), screw thread (5) and the second taper seat (6) successively to the top of male end (1); The first taper seat (4), screw thread (5) are consistent with the tapering of the second taper seat (6); The vertical length of the first taper seat (4) is 38.1mm, the vertical length of the second taper seat (6) is 28.57mm, at the first taper seat (4) between the second taper seat (6) being screw thread (5), the first taper seat (4) connects with screw thread (5) crest transition, and the second taper seat (6) connects with transition at the bottom of screw thread (5) tooth; Transition arc radius between main shoulder (3) and the first taper seat (4) is 3mm, and the transition arc radius between slave station shoulder the 7 and second taper seat (6) is 3mm.

2. conical surface docking double shoulder tool joint according to claim 1 is characterized in that: half of thread angle 37.5 degree of described screw thread (5), thread height 2.5mm, crest height 1.076mm.

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