MXPA99010075A - Ultra high torque double shoulder tool joint - Google Patents

Abstract

An ultra high torque double shoulder tool joint for maximizing the torsional strength of a threaded connection by correlating a transverse cross-sectional counter-bore area of the box (12) and pin (10). The pin (10) includes a base section (74) and a nose section (24). The nose section (24) defines a cross-sectional nose area (28). The pin external threads (22) include a taper no greater than 1/12. The box (12) include a cross-sectional counterbore area (46) and a cross-sectional box area (52). The overall strength of the tool joint is dependent upon the torsional strength of the threaded connection, the cross-sectional nose area (28) and the cross-sectional counter-bore area (46).

Description

EXTRA LARGE TORQUE DOUBLE SHOULDER TOOL JOINT DESCRIPTION OF THE INVENTION The present invention generally relates to tubular oil well threaded connections capable of transmitting torque through the threaded connection during drilling operations. In particular, the present invention relates to threaded tubular oilfield connections on drill pipe, drill collars or tool joints incorporating tapered threads between a radially outer shoulder and a radially internal shoulder, commonly referred to as a rotating shoulder connection. . The double shoulder connection is designed to withstand torque and maintain torque comparable to that of the tubular. The double-shoulder threaded connections on oilfield tubular elements typically include a spigot connector at one end of the tubular member and a box connector at the other end. Each connector is adapted to be coupled with a corresponding connector at the opposite end of the other tubular element. The spigot connector usually includes a large internal diameter or flow path and external threads extending axially between an external shoulder radially outwardly and a radially inwardly spigot face. The spigot connector also includes a base section extending axially between the outer shoulder and the external threads and a mouth section extending axially between the spigot face and the external threads. The box connector typically includes an internal diameter defining a flow path substantially compatible with that of the internal diameter of the pin connector, internal threads extending axially between an internal shoulder radially inwardly and a box face radially outwardly. for threaded connection with the spigot connector, and a crossbar section located between the internal threads and the box face. External threads and internal threads typically include a taper extending radially outwardly from a first spindle thread adjacent the mouth section to a last spike thread adjacent to the base section that is sufficiently tapered to allow quick connection and efficient spike and box connectors. In conventional drill pipe, there is usually no internal shoulder in the box member for splice coupling of a mouth or face of the pin. When the spigot and case connectors are rotatably connected to the surface, a torque is reached which extends the spigot in the final thread to approximately half its elastic limit. If additional torque is imparted during drilling operations, it is possible to exceed the torque of the threads on the spigot and box connectors. Consequently, it is advantageous to use tool joints with high torque transmission capabilities in order to overcome the weaker threaded connection. While a number of attempts have been made to create a threaded connection with high torque resistance abilities; very few have focused on the ability to resist torque so that the shear stress on the thread is no weaker than the strength of the entire tool joint, including the threaded connection. As a result of attempts to resist torque in the threaded connection, several design changes have been made to tool joints as long as an attempt is made to maintain a maximum internal diameter or flow path. For example, U.S. Patent No. 4,548,431 to Hall et al presents a tool joint designed to withstand a higher torque load than conventional tool joints. The design of Hall et al incorporates a threaded connection having a diameter of the spout mouth section that decreases as the thread length increases. So, since the torque of the tool joint of Hall et al is contingent on the diameter of the spigot end section, increasing the thread length adversely affects the torsional stress. As subsequently determined by the Hall et al design test the connections designed with suitable threaded lengths for the smallest anticipated internal diameter resulted in a cross-sectional area of the spindle mouth section in the largest diameter available which was too much. little. The larger internal diameters produced a spigot head with inadequate resistance compared to the base of the spigot, the box counter-barrel section and the threads. Therefore the threaded connection was not balanced. U.S. Patent No. 5,492,375 discloses an improvement over the patent of Hall et al. The '375 patent is directed to maximizing the torque of the threaded connection by optimizing the thread length and the mouth diameter for any given internal diameter. However, neither Hall et al nor the '375 patent provides the geometrically balanced threaded connection without the need to correlate the mouth diameter or cross-sectional area with the mouth length. Additionally, U.S. Patent No. 4,549,754 uses a thread design that linearly distributes the loads along several threads to decrease external taper on the threads relative to the internal threads, so that tapering the external threads is generally less than the taper of the internal threads. The present invention incorporates a novel thread design for tubular counter-barrel connections used in oil field production and / or termination activities. The threaded connection may consist of a male shank member on one end of the tubular element that molds inside a female box member on one end of another tubular element, each tubular element having a shank member on one end and a member of box on the other end. The novel thread design of the present invention utilizes a double connecting shoulder incorporating a tapered thread between the outer shoulder radially outwardly on the shank member and an inner shoulder radially inwardly on the box member. The threaded connection is geometrically balanced to resist torque in the threaded connection after a preload stress that has been induced in an area radially adjacent to the last spigot thread and the radially internal shoulder engages one face of the spigot. The main consideration is given to the internal diameter or flow path of the tubular element for the transmission of the drilling fluid. Therefore, the internal diameter of the threaded connection has a general precedence over the resistance of the connection. The present invention is directed to maximizing the torsional strength of a threaded connection by correlating an orifice of a counter-barrel area of cross-section of the box and a mouth area of cross-section of the pin. The present invention achieves the above objective by the use of a tubular shank with external threads extending axially between an external shoulder radially outwardly and a radially inwardly spigot face. The spike includes a base section extending axially between the outer shoulder and the external threads, and a mouth section extending axially between the spigot face and the external threads. The mouth section defines the mouth area of cross section between an internal diameter of the mouth section and an external diameter of the mouth section. The external threads include a taper substantially less than the tapers of the standard tool seal and preferably includes a smaller taper than the internal taper and no greater than 2 tapers., 54 cm (1 inch) per 30.4 cm (foot) extending radially outwardly from a first spigot thread adjacent the mouth section to a last spigot thread adjacent to the base section.

A tubular box is threaded for connection to the pin and have internal threads that section axially between an internal shoulder radially inwardly and a box face radially outwardly. The box includes a crossbar section between the internal threads and the box face. The counter-barrel section defines the cross-barrel area of cross-section between an internal diameter of the counter-barrel section and an external diameter of the counter-barrel section. The box defines a box area of cross section between an internal diameter of the box and an outer diameter of the box in a separate location axially opposite the internal thread with respect to the internal shoulder. When the threaded connection is formed, the preload stress is induced in an area radially adjacent to the last spigot thread and the spigot face and the inner shoulder are engaged. The additional torque imparted on the threaded connection during forming operations is transmitted through the weaker threaded connection resulting in the flat engagement of the spigot face and the inner shoulder. As a result, the overall strength of the tool joint depends on the torsional strength of the threaded connection in the area adjacent the engaged spigot face and the inner shoulder. The torsional strength of the threaded connection is improved by restricting the counter-barrel area of cross-section and the mouth area of cross section to at least 70% of the cross-sectional box area. Therefore, there is a correlation between the cross-barrel area of cross section (Al) and the mouth area of cross section (A2) and the box area of cross section (A3) such that A1 + A2 > (70%) A3. The above correlation can be maintained as long as it is also required that the counter-barrel section includes an axial length of at least 1.5 (3.81 cm) between the internal threads and the box face. Therefore, the torsional strength of the threaded connection is contingent on Al + A2 = (70%) A3 and any of the threads includes a taper that is not greater than 2.54 cm (1 inch) for every 30.4 cm (foot) or the counter-barrel section has an axial length of at least 3.81 cm (1.5 inches). In one embodiment of the present invention, the transverse counter-barrel area is at least 10% larger than a cross-sectional area between an origin of the last spigot thread and an internal diameter of the spike radially adjacent thereto and the internal thread and the external threads have an axial spacing of approximately 3.5 threads for every 2.54 cm (1 inch). Additionally, the internal diameter of the mouth section is not less than the diameter of the box, a location axially opposite the internal threads with respect to the internal shoulder, and the external diameter of the box is not greater than a diameter external between the box face and the internal shoulder. In another embodiment of the present invention, an outer diameter of the base section and the internal diameter of the counter-barrel section define a radial clearance of at least 0.07 cm (0.3 inches) when the spigot and housing are connected. The outer diameter of the mouth section and the internal diameter of the box radially adjacent to the mouth section define a radial clearance of at least 0.07 cm (.03 inches) when the spigot and box are connected as well. According to a preferred method for forming the threaded connection of the present invention, a spigot is formed with external threads extending axially between an external shoulder radially outwardly and a radially inwardly spigot face. The spike includes a base section extending axially between the outer shoulder and the external threads, and a mouth section extending axially between the spigot face and the external threads. The mouth section also defines an area of transverse mouth between an internal diameter of the mouth section and an external diameter of the mouth section. External threads include taper no greater than 2.54 cm (1 inch) for every 30.04 cm (1 foot) extending radially outwardly from the first spigot thread adjacent the mouth section to a last spigot thread adjacent to the spigot. base section. A tubular box is formed for threaded connection with the spike and has internal threads extending axially between an internal shoulder radially inwardly and a box face radially outwardly. The box includes a crossbar section between the internal threads and the box face. The counter-barrel section defines a counter-barrel area of cross section between an internal diameter of the counter-barrel section and an external diameter of the counter-barrel section. The box defines a box area of cross section in a separate location axially opposite the internal threads with respect to the internal shoulder between an internal diameter of the box and an outer diameter thereof. The counter-barrel cross-sectional area and the cross-sectional mouth area define a combined cross-sectional area of at least 70% of the cross-sectional box area. The shank and the box are then connected to couple the box face with the external shoulder and induce a preload stress on the pin and box in an area radially adjacent to the last pin thread. Finally, the torsion is transmitted through the flat coupling of the spigot face and the inner shoulder during the drilling operations so that the threaded connection has a torsional strength comparable to that of the tubular element. It is therefore a general object of the present invention to provide an improved double-shoulder threaded connection that is capable of resisting torque in the threaded connection and possesses a torsional strength comparable to that of the tubular member. It is therefore an object of the present invention to provide a double-shoulder threaded connection having a counter-barrel area of combined cross-section and a mouth area of cross section of at least 70% of the cross-sectional box area. It is yet another object of the present invention to provide an improved double-shoulder threaded connection with internal threads and external threads having sufficient axial spacing to ensure that the pin and box members when placed in tension and facilitate the transmission of torque through of the thread inside the inner shoulder. It is another object of the present invention to provide a double shoulder threaded connection with balanced geometry so that: 1. Al + A2 >; (70%) A3; and 2. the external thread taper is not greater than 2.54 cm (1 inch) for every 30.04 cm (1 foot); or 3. the axial length of the counter-barrel section is at least 1.5 inches (3.81 cm). It is a feature of the present invention to provide a double-shoulder threaded connection with external threads having a taper that is not more than 2.54 cm ( 1 inch) per 30.04 cm (1 foot) extending radially outwardly from a first spigot thread adjacent the mouth section to a last spigot thread adjacent to the base section. Another feature of the present invention is to provide a double-shoulder threaded connection that includes a counter-barrel section having an axial length of at least 1.5 (3.81 cm) between the internal threads and the box face. It is an advantage of the present invention to provide a threaded connection with sufficient taper to allow quick and efficient connection of the threaded pin of the threaded and box members. It is another advantage of the present invention to provide a mouth width of a larger cross section. It is another advantage of the present invention to provide a double-shoulder threaded connection with a radial clearance of at least 0.07 cm (.03 inches) between the outer diameter of the base section and an inner diameter of the counter-barrel section when they connect the spigot and the box. It is another advantage of the present invention to provide a double-shoulder threaded connection with a radial clearance of at least 0.07 cm (.03 inches) between the outer diameter of the mouth section and an internal diameter of the housing radially adjacent to the housing. Mouth section when the spigot and the box are connected. It is yet another advantage of the present invention to provide a double-shoulder threaded connection with an external thread taper which is less than the internal thread taper. This and other features objects and advantages of the present invention will become apparent from the following detailed description, wherein reference is made to the figures and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a sectional view of a longitudinal quarter of the shank and box members according to the present invention in position for threaded connection. Figure 2 is an enlarged detail view of the circle area in Figure 1. Figure 3 is an enlarged detail view of the circle area of Figure 1.

Referring now to Figure 1, a tubular threaded pin 10 is located at one end of a section of the drill pipe in a position for connection coupled to a tubular threaded box 12 of another section of drill pipe. The pipe that carries the pin 10 has a corresponding box similar to 12 at its other end. Similarly, the pipe that carries the box 12 has a spike similar to 10 at its other end. The tubular shank 10 includes external threads 22 extending axially between a radially outwardly external shoulder 18 and a radially inwardly spigot face 26. The shank 10 also includes a base section 16 extending axially between the external shoulder 18 and the external thread 22, and a mouth section 24 extending axially between the shank face 26 and the external threads 22. The mouth section 24 further defines a mouth area of cross section 28 between an internal diameter 30 of the section of mouth 24 and an external diameter 32 of the mouth section 24. The mouth cross-sectional area 28 is material for the torsional strength of the threaded connection. The cross-sectional mouth area 28 is a function of the axial length and the taper of the threads. Fewer threads per 2.54 cm (1 inch) and a shallow taper result in greater torsional strength of the threaded connection in general. Conversely, a more stepped taper allows quick connection of the tubular pipe sections. More threaded per 2.54 cm (1 inch) reduces slippage or disconnection of pipe sections under stress loads. Consequently, a number of geometrical dimensions must be balanced to achieve a threaded connection capable of high torque transmission through the threaded connection. The present invention reduces the standard thread taper on tubular elements from 3.17 to 5.08 cm (1 1/4 to 2) to no more than 2.54 cm (1 inch) per each . 04 cm (1 foot). The external threads 22 therefore include a taper extending radially outwardly from a first spigot thread 34 adjacent the mouth section 24 to a final spigot thread 36 adjacent to the base section 16. The external threads 22 they have a taper that is not greater than about 2.54 cm (1 inch) for every 30.04 cm (1 foot) extending radially outwardly from the first spigot thread 34 to the last spigot thread 36, and preferably is not greater than 2.03 cm (8 inches) by 30.04 cm (1 foot). The tubular case 12 is threaded for connection to the shank 10 and includes internal threads 38 extending axially between an internal shoulder radially inwardly 40 and a box face radially outwardly 42.

Although the internal threads 38 preferably include a greater taper than that of the external threads 22 for linear distribution of the load through the external threads 22 and the internal threads 38 when the pin 10 and the box 12 are connected, the internal threads 38 and the external threads 22 may include an identical taper. Thus, the internal threads 38 include a taper that forms an angle 39 of about 1.8 degrees relative to a box axis 12 that is larger than the taper of the external threads 22 that form an angle 20 of approximately 1.6 degrees relative to to an axis of the spike 10. There are approximately 3.5 external threads 22 per each 2.54 cm (1 inch) in a preferred embodiment to reduce the slippage of the threaded connection when placed under tension. The box 12 includes a counter-barrel section 44 having an axial length 45 greater than about 3.81 cm (1.5 inches), and preferably at least 5.08 cm (2 inches), located between the internal threads 36 and the box face 42. The axial length 45 of the counter-brace section 44 must be long enough to increase the mass or volume of material on which the torque or tension is distributed., so as not to exceed the voltage limits in the tubular connection. The counter-barrel section 44 defines a cross-barrel area of cross-section 46 between an inner diameter 48 of the counter-barrel section 44 and an outer diameter 50 of the counter-barrel section 44. The box 12 also defines a box of cross-section 52 between a inner diameter 54 of the case 12 and an outer diameter 56 of the case 12 in a separate location axially opposite the internal threads 38 with respect to the inner shoulder 40. In a preferred embodiment, the cross-barrel area of cross-section 46 is at least 10% greater than a cross-sectional area between an origin of the last spigot thread 58 and an internal diameter 60 of the spike 10 radially adjacent thereto. It is important to maintain a comparable torsional strength between the cross-barrel area of cross section 46 and the cross-sectional area between an origin of the last spigot thread 58 and the internal diameter 60 of the spike 10 radially adjacent thereto. Therefore, in order to maintain a comparable torsional strength and to avoid fatigue of the tubular element in the area thus described, it is preferable to maintain a counter-barrel area of comparable cross-section 46 with that of the cross-sectional area between an origin of the last spigot thread 58 and an internal diameter 60 of spigot 10 radially adjacent thereto. The cross-barrel area of cross-section 46 is preferably 10% larger than the cross-sectional area between an origin of the last spigot thread 58 and an internal diameter 60 of the spike 10 radially adjacent thereto in order to account for the reduction of material caused by wear and friction towards the outer diameter 50 of the counter-barrel section 44. When the shank 10 and the box 12 are connected before use, the box face 42 and the external shoulder 18 are placed in engagement coincidental plane. During the forming operations, an axial preload stress is placed on the shank 10 and the box 12 in an area radially adjacent to the last spigot thread 36 and the shank face 26 and the inner shoulder 40 are engaged. The shank face 26 and the inner shoulder 40 preferably form an axial clearance of at least 0.012 cm (.005 inches) when the box face 42 and the outer shoulder 18 are initially engaged to restrict a preload stress to the shank 10 and case 12 in an area radially adjacent to the last spigot thread 36 prior to the matching flat engagement of shank face 26 and inner shoulder 40. The dimensions of the threaded connection thus described enable the transmission of torque encountered during the drilling operations through the threaded connection until the spigot face 26 and the inner shoulder 40 engage. The additional torque found in the engaged spigot face 26 and the inner shoulder 40 are concentrated adjacent the last engaged thread 62 on the internal threads 38 of the box 12. Therefore the axial compressive loads found in the area radially adjacent to the end box thread 62 on the internal threads 38 requires that the cross-barrel area of combined cross-section 46 and the mouth area of cross-section 28 be at least 70% of the box area of cross-section 52, and preferably of at least about 75% of the cross-sectional box area 52. Although the combined torsional strength of the cross-mouth area 28 and the counter-barrel cross-sectional area 46 can be manipulated by increasing the outer diameter of the counter-barrel section 50 or decreasing the internal diameter of the mouth section 30, giving considerable difference to the flow path or internal diameter of the threaded connection on its elastic resistance. Accordingly, the present invention allows for an optimal flow path and a maximum internal diameter for the spigot 10 and the casing 12 by correlating specific geometries of the spike 10 and the casing 12 as explained hereinabove. In a preferred embodiment, the internal diameter 30 of the mouth section 24 is not less than the internal diameter 54 of the box 12, and the external diameter 56 of the box 12 is not greater than the external diameter 50 of the box 12 between the box face 42 and the inner shoulder 40. Referring now to Figure 2, the external threads 22 are shown in an elongated detailed view of the circular area in Figure 1. In a preferred embodiment, the first spike thread 34 includes an origin 64. which has a larger external diameter than the mouth section 24 of the outer diameter 32. Additionally, the external diameter 32 of the mouth section 24 and an internal diameter 66 of the box 12 radially adjacent to the mouth section define a space radial free 68 of at least 0.07 cm (.03 inches) when the shank 10 and the box 12 are connected. Referring now to Figure 3, an elongated detail view of the internal threads 38 of the circle area in Figure 1 are shown. In a preferred embodiment, the box 12 has a first box thread 70 adjacent to the counter-barrel section 44. The counter-barrel section of the internal diameter 48 is preferably larger than an internal diameter of an origin 72 of the first box thread 70. Additionally, an outer diameter 74 of the base section 16 and the inner diameter 48 of the counter-barrel section 44 define a radial clearance 76 of at least 0.07 cm (.03 inches) when the shank 10 and the box 12 are connected. .

In a preferred embodiment for forming a threaded connection in accordance with the present invention, a tubular shank 10 is formed with external threads 22 extending axially between a radially outwardly external shoulder 18 and a radially inwardly spigot face 26 as shown in Figure 1. The spike 10 includes a base section 16 extending axially between the outer shoulder 18 and the external threads 22 and a mouth section 24 extending axially between the spigot face 26 and the external threads 22. The mouth section 24 defines a mouth area of cross section 28 between an internal diameter 30 and an outer diameter 32 of the mouth section 24. The external threads 22 also have a taper no greater than about 2.54 cm (1 inch) per (30.04 cm), and preferably not more than about 2.03 cm (0.8 inches) by 30.04 cm (1 foot), extending radially outwardly from a first spigot thread 34 adjacent to the mouth section 24 to a last spigot thread 36 adjacent to the base section 16. A tubular box is formed for threaded connection with the spigot 10. The tubular case 12 has internal threads 38 extending axially between an inner shoulder radially inwardly 40 and a box face radially outwardly 42. Although the internal threads 38 preferably include a greater taper than the taper of the external threads 22 for linear distribution of the load through the external threads 22 and the internal threads 38 when the shank 10 and the box 12 are connected, the internal threads 38 and the external threads 22 can include an identical taper. Thus, the internal threads 38 include a taper that forms an angle 39 of about 1.8 degrees relative to a box axis 12 that is larger than the taper of the external threads 22 that form an angle 20 of approximately 1.6 degrees relative to to an axis of the spigot 10. The tubular case 12 also includes a counter-barrel section 44 between the internal threads 38 and the box face 42. The counter-barrel section defines a cross-barrel area of cross-section 46 between an internal diameter 48 and an outer diameter 50 of the counter-barrel section 44. In addition, the box 12 defines an area of boxes of cross-section 52 between an internal diameter 54 and an outer diameter 56 of the box 12 at a location spaced axially opposite the internal threads 38 with respect to the internal shoulder 40. The box 12 and the pin 10 are then connected to couple the box face 42 with the external shoulder 18. During the training operations n, an axial preload tension is placed on the shank 10 and the box 12 in an area radially adjacent to the last spigot thread 36 and the shank face 26 and the inner shoulder 40 are engaged. Once the torsion is transmitted through the threaded connection, the general torsional strength of the pin 10 and the box 12 is maintained uniformly, providing the combined cross-sectional area 46 and the transverse mouth area 28 are at least 70%, and preferably 75%, of the cross-sectional box area 52. Various other modifications to the threaded connection described herein should be apparent from the description of the preferred embodiments. Although the invention has been described in detail for those embodiments, it should be understood that this explanation is for illustration only and that the invention is not committed to the embodiments described. The alternative components and operating techniques should be apparent to those skilled in the art in view of this description. The modifications were contemplated and can be made without departing from the spirit of the invention, which is defined by the claims.

Claims (20)

1. CLAIMS 1. A threaded tubular oil field connection with high torsion transmission capacity through the threaded connection characterized in that it comprises: a tubular shank with external threads extending axially between an external shoulder radially outwardly and a radially spigot face inwards, the shank including a base section extending axially between the outer shoulder and the external threads and a mouth section extending axially between the shank face and the external threads, the mouth section which defines a mouth area of cross section between an internal diameter of the mouth section and an external diameter of the mouth section; external threads that have a taper no greater than 2.54 cm (1 inch) for every 30.04 cm (1 foot) extending radially outwardly from a first spigot thread adjacent to the mouth section to a last spigot thread adjacent to the base section; a tubular case for threaded connection with the spigot, the tubular case having internal threads extending axially between an internal shoulder radially inwardly and a case face radially outwardly includes a counter-barrel section between the internal threads and the face of box, the counter-barrel section that defines a counter-barrel area of cross-section between an internal diameter of the counter-barrel section and an external diameter of the counter-barrel section, and the box that defines a box area of cross section between a diameter internal of the box and an external diameter of the box in a axially separated location opposite the internal threads with respect to the internal shoulder; the counter-barrel cross-sectional area and the cross-sectional mouth area defining a combined cross-sectional area of at least 70% of the cross-sectional box area; and the box face and the outer shoulder which are in matching flat coupling when the pin and the box are shaped to induce a preload stress on the pin and box in an area radially adjacent to the last pin thread before coupling coincident plane of the spike face and the inner shoulder. The threaded connection according to claim 1, characterized in that the combined cross-sectional area is at least 75% of the cross-sectional box area. The threaded connection according to claim 1, characterized in that the taper is not greater than about 2.03 cm (.8 inches) per 30.04 cm (1 foot) extending radially outward from the first spigot thread until the last spike thread. 4. The threaded connection according to claim 1, characterized in that the internal threads include a taper that is greater than the taper of the external threads. The threaded connection according to claim 1, characterized in that the cross-barrel area of cross-section is larger than a cross-sectional area between an origin of the last spigot thread and an internal diameter of the spike radially adjacent thereto. The threaded connection according to claim 5, characterized in that the counter-barrel area of cross section is at least 10% larger than the cross-sectional area between the origin of the last spigot thread and the internal diameter of the spindle. spike radially adjacent thereto. The threaded connection according to claim 1, characterized in that the internal threads and the external threads have an axial separation of at least four threads for every 2.54 cm (1 inch). The threaded connection according to claim 7, characterized in that the axial spacing is approximately 3.5 threads per 2.54 cm (1 inch). 9. The threaded connection according to claim 1, characterized in that the box has a first box thread adjacent to the counter-barrel section and the box at least one box thread adjacent to the inner shoulder, the counter-barrel section within the diameter that is greater than an internal diameter of an origin of the first box thread. The threaded connection according to claim 1, characterized in that an origin on the first spigot thread has an external diameter greater than the external diameter of the mouth section. The threaded connection according to claim 1, characterized in that the internal diameter of the mouth section is not less than the internal diameter of the box. 12. A threaded tubular oilfield connection with high torsional transmission capacity through the threaded connection characterized in that it comprises: a tubular shank with external tapered threads extending axially between an external shoulder radially outward and a face of spike radially inward, the spike including a base section extending axially between the outer shoulder and the external threads and a mouth section extending axially between the spigot face and the external threads, the section of mouth defining a mouth area of cross section between an internal diameter of the mouth section and an external diameter of the mouth section. a tubular box for threaded connection with the shank, the tubular box having internal threads extending axially between a radially inwardly internal shoulder and a box face radially outward and including a counter-barrel section having an axial length of at least 3.81 cm (1.5 inches) between the internal threads and the box face, the counter-barrel section that defines a counter-barrel area of cross section between an internal diameter of the counter-barrel section and an external diameter of the counter-barrel section, and the box defining a box area of cross section between an internal diameter of the box and an external diameter at a location axially spaced opposite the internal threads with respect to the internal shoulder; the counter-barrel cross-sectional area and the cross-sectional mouth area defining a combined cross-sectional area of at least 70% of the cross-sectional box area; and the spigot face and the internal shoulder of the box having an axial clearance of at least 0.012 cm (.005 inches) when the spigot and housing are initially shaped to restrict a preload stress of both the spike and of the box in an area radially adjacent to the last spigot thread before the matching flat coupling of the spigot face and the inner shoulder. The threaded connection according to claim 12, characterized in that an axial length of the counter-barrel section is greater than about 5.08 cm (2 inches). The threaded connection according to claim 12, characterized in that the combined cross-sectional area is at least 75% of the cross-sectional box area. The threaded connection according to claim 12, characterized in that the cross-barrel area of cross-section is larger than a cross-sectional area between an origin of the last spigot thread and an internal diameter of the spike radially adjacent thereto. 16. The threaded connection according to claim 12, characterized in that an outer diameter of the base section and the internal diameter of the counter-barrel section define a radial clearance of at least 0.07 cm (.03 inches) when the spike and the box are connected. 17. The threaded connection according to claim 12, characterized in that the external diameter of the mouth section and the internal diameter of the cape radially adjacent to the mouth section define a radial clearance of 0.07cm (.03). inches) when the spigot and the box are connected. '; 18. The threaded connection according to claim 12, characterized in that the external diameter of the box is not greater than an external diameter of the box between the box face and the internal shoulder. 19. The threaded connection according to claim 12, characterized in that the internal threads include a taper which is generally a taper of the external threads. 20. A method for forming a threaded connection in a tubular oil field element with high torque transmission capacity through the threaded connection characterized in that it comprises: forming a tubular pin with external threads extending axially between an external shoulder radially outwardly and a radially inwardly spigot face, or the shank including a base section extending axially between the outer shoulder and the external threads and a mouth section extending axially between the shank face and the external thread , the mouth defining a mouth area of cross section between an internal diameter of the mouth section; external threads having a taper not greater than 2.54 cm (1 inch) by 30.04 cm (1 foot) extend radially from a first spigot thread adjacent the mouth section to a last spigot thread adjacent to the base section; forming a tubular casing for threaded connection with the spigot, the tubular casing having internal threads extending axially between an internal shoulder radially inwardly and a casing face radially outward and including a counter-barrel section between the internal threads and the box face, the counter-barrel section defining a counter-barrel area of cross-section between an internal diameter of the counter-barrel section and an external diameter of the counter-barrel section, and the box defining a cross-sectional box area in one location axially separated opposite the internal threads with respect to the internal shoulder and between an internal diameter of the box and an external diameter of the box; the counter-barrel cross-sectional area and the cross-sectional mouth area defining a combined cross-sectional area of at least 70% of the cross-sectional box area; connect the box and the shank to engage the box face with the outer shoulder and induce a preload stress on the shank and box in an area radially adjacent to the last shank thread, and transmit the torque through the flat coupling of the spike face and the inner shoulder during drilling operations.