RU52968U1 - POSITIONING PIPE EQUIPPED WITH CONNECTION TMK CS - Google Patents

Abstract

Usage: to the field of mining, namely to the casing, designed for mounting oil and gas wells.

The objective of the utility model: the creation of high-tight equal bore casing with a trapezoidal profile thread and optimally balanced parameters of conical sealing elements.

Applicant: Sinarsky Pipe Plant OJSC

Patent holder: Sinarsky Pipe Plant OJSC

Utility Model Essence

The casing equal bore pipe with a TMK-CS conical threaded joint of increased tightness contains a male element - the nipple part of the pipe with an external thread of a trapezoidal profile at both ends of the pipe and sealing bands with a tapered outer surface with a taper of 1:12 or 1:16 located between the thread and the ends of the pipe, and the generatrix of the persistent sealing ends is inclined to an axis perpendicular to the axis of the pipe, at an angle of 7 ° -20 ° and the male element is a sleeve (sleeve part of the pipe) screwed onto one end of the pipe and having mating threads, a sealing conical bore and a thrust sealing ledge interacting with the thread and the corresponding sealing and thrust surfaces of the pipe. In this case, the female element has a groove in the transition section from the internal thread to the sealing bore to exit the thread-forming tool and preserve the lubricant. The diameter along the bottom of the groove is 0.6-1.5 mm larger than the diameter of the grooves of the coupling thread in the plane of the intersection of the thread with the groove, while the sides of the groove are located at an angle of 20 ° -45 ° to the axis perpendicular to the axis of the thread and mate with the bottom of the groove radius, and the groove width is 4-9 mm. The male element has a sealing girdle length of 9-12 mm, and the internal diameter of the female element in the middle of the coupling is equal to the internal diameter of the pipe, taking into account the tolerances.

Description

The claimed utility model relates to the field of mining, namely to casing pipes intended for fastening oil and gas wells.

A screw connection of metal pipes with a tapered thread of a trapezoidal profile is known, at the ends of which, in order to improve tightness, two smooth conical surfaces (external and internal) are made, which, after screwing up the threads, are in contact with similar smooth mating conical grooves in the sleeve (US Pat. No. 434663 , M. C. E 21 b 17/02, publ. 06/30/1974). Conical recesses in the coupling are a limiter (emphasis) when tightening the thread.

Subsequently, on the basis of this design, a large number of inventions were made, mainly differing in the specific dimensions of the angles of the inner and outer thrust cones, the length of the sealing girdle at the end of the pipe, and the ratio of the sizes of the conical ends of the pipes and grooves in the couplings.

With regard to thin-walled casing pipes, it is not always possible to make a workable connection of sealing conical elements of a given strength and tightness. The pipe wall thickness is often not enough to accommodate the trapezoidal thread and the necessary contact surfaces of the smooth cones.

Known pipe conical threaded connection OTTG for casing with a diameter of 114-273 mm according to GOST 632-80 (Casing pipes and couplings to them. Technical conditions. Threaded connection OTTG, drawing 12) with trapezoidal thread OTTM and radial conical element 29 mm long, having a persistent end surface made perpendicular to the axis of the pipe.

The disadvantages of OTTG joints include significant contact stresses in the conical radial seal and the large length of the sealing element (girdle), which in some cases leads to an unacceptable decrease in the thickness of its wall in the plane of contact with the stop in the coupling. In this regard, casing pipes with an OTTG connection cannot be manufactured with a wall thickness of less than 8.5 mm.

The closest to the claimed utility model in terms of features is a casing with a VAM connection, which uses a Batress trapezoidal thread with a taper of 1:16 and a sealing conical girdle with a taper of the outer surface 1:10 (slope angle 2 ° 51 ′), and also a mechanical thrust sealing surface at an angle of 15 ° to the axis perpendicular to the axis of the pipe. The specified parameters apply to the entire size range of casing pipes with a VAM connection.

The objective of this utility model is to create highly tight equal bore casing with trapezoidal thread and optimally balanced parameters of conical sealing elements.

This problem is solved due to the fact that the casing equal bore pipe with a TMK-CS tapered threaded joint of increased tightness contains a male element — the nipple part of the pipe with the external thread of the trapezoidal profile at both ends of the pipe and sealing bands with a tapered outer surface with a taper of 1:12 or 1:16, located between the thread and the ends of the pipe, and the generatrix of the thrust sealing ends is inclined to the axis perpendicular to the axis of the pipe at an angle of 7 ° -20 ° and the male element is a coupling (coupling part pipes), screwed onto one end of the pipe and having mating threads, a sealing conical bore and a thrust sealing ledge interacting with the thread and the corresponding sealing and thrust surfaces of the pipe. In this case, the female element has a groove in the transition section from the internal thread to the sealing bore to exit the thread-forming tool and preserve the lubricant. The diameter along the bottom of the groove is 0.6-1.5 mm larger than the diameter of the grooves of the coupling thread in the plane of the intersection of the thread with the groove, while the sides of the groove are located at an angle of 20 ° - 45 ° to the axis perpendicular to the axis of the thread and are conjugated with the bottom of the groove of radius and the width of the groove is 4-9 mm. The male element has a sealing girdle length of 9-12 mm, and the internal diameter of the female element in the middle of the coupling is equal to the internal diameter of the pipe, taking into account the tolerances.

The essence of the utility model is illustrated in figures 1, 2, 3 and 4.

Figure 1. Casing with connection TMK CS with screwed-in sleeve.

Figure 1. Male element (nipple) with connection TMK CS.

Figure 3. Covering element (coupling) with connection TMK CS.

Figure 4. View A of Fig. 3.

Casing equal bore pipe with a connection of TMK CS with a screwed coupling (Fig. 1) consists of a pipe 1, at the ends of the nipple parts of which are made: a trapezoidal thread 2 with a taper of 1:16, conical sealing bands 3 with a taper of 1:16 or 1:12 and thrust sealing ends 4, the generatrix of which is inclined at an angle β = 7 ° -20 ° to the axis perpendicular to the axis of the pipe, and the female element (sleeve) 5 with mating threads 6, tapered sealing bores 7 and thrust sealing ledges 8, interacting with thread and stvuyuschimi sealing and abutment surfaces of the pipe (2, 3, 4).

The length of the sealing girdle 3 ℓк = 9-12 mm (figure 2)

On the transitional section from the thread 6 to the sealing bore 7, a groove 9 is made in the female element to exit the thread-forming tool and preserve the lubricant (Figs. 3 and 4).

The diameter dk of the groove 9 along the bottom of the groove is larger than the diameter dp of the troughs of the thread 6 of the sleeve 5 in the plane of intersection of the thread with the groove by 0.6-1.5 mm, while the lateral surfaces of the grooves 11 and 12 (Fig. 4) are located at an angle γ = 20 ° -45 ° to the axis perpendicular to the axis of the thread, and mated with one groove 10 of radius R. The width of the groove ℓ = 4-9 mm.

The inner diameter of the coupling dm (figure 4) is equal to the inner diameter of the pipe, taking into account the tolerances.

Based on well-known technical solutions, a casing with optimally balanced radial and mechanical conical seals was created.

The developed connection of TMK CS casing with the proposed structural solutions: a sealing conical girdle on the pipe and a bore in the coupling with a taper of 1:12 or 1:16; persistent sealing end on the pipe and ledge in the coupling, the generators of which are located at an angle in the range from 7 ° to 20 °; groove to exit the thread-forming tool and preserve lubricant in the coupling, having a bottom diameter of 0.6-1.5 mm greater than the diameter of the thread depression of the coupling in the plane of the intersection of the thread with the groove, while the sides of the groove are at an angle of 20 ° to 40 ° to the axis of the perpendicular axis of the thread and mated with the bottom of the groove with a radius, and the width of the groove is 4-9 mm; a sealing girdle on the nipple part of the pipe 9-12 mm long; inner diameter of male element in the middle

couplings equal to the inner diameter of the pipe, taking into account tolerances, withstands high internal pressure of liquid and gas, is more stable against deformation of the sealing girdle and seizing (scuffing) of its contact surfaces with possible overtightening of the thread, allows multiple screwing and unscrewing, and ensures equal passage of the inner channel of the casing along the entire length.

Pilot casing lots were manufactured with a nominal diameter of 140 mm and a nominal diameter of 102 mm with a TMK CS connection, including conical sealing bands on pipes and bores in couplings with taper 1:16 and 1:12 and sealing ends on pipes and ledges in couplings, which form are located at an angle of 7 ° and 15 °, as well as the structural elements described above.

The assembly of test tubes into columns and their operation at OJSC “Surgutneftegas” and OJSC “Sibneft-NNG” using a new technical solution yielded positive results. The work performed showed the feasibility of producing casing pipes with TMK CS connection on existing equipment and the possibility of building, using these pipes, high-tight casing strings in oil and gas wells.

Claims (4)

1. Casing equal bore pipe with TMK CS conical threaded joint of increased tightness, containing the male element — the nipple part of the pipe with the external thread of the flute profile at both ends of the pipe and sealing belts with a tapered outer surface located between the thread and the pipe ends, as well as with persistent sealing ends, and the enclosing element is a coupling screwed onto one end of the pipe and having mating threads, a sealing conical bore and a persistent sealing ledge, in interacting with the thread and the corresponding sealing and thrust surfaces of the nipple part of the pipe, characterized in that the conical sealing surfaces of the female and male elements are angled with a taper of 1:12 or 1:16, and the generatrices of the resistant sealing ends and ledges are inclined to an axis perpendicular to the axis pipes at an angle of 7-20 °. 2. Casing equal bore pipe according to claim 1, characterized in that in the female element (sleeve) on the transition section from the internal thread to the sealing bore there is a groove for the threading tool to exit and preserve the lubricant, while the diameter along the bottom of the groove is 0.6 more -1.5 mm of the diameter of the groove of the coupling thread in the plane of the intersection of the thread with the groove, and the sides of the groove are located at an angle of 20-45 ° to the axis perpendicular to the axis of the thread and are conjugated with the bottom of the groove radius, the width of the groove is 4-9 mm. 3. Casing equal bore pipe according to claim 1, characterized in that the length of the sealing strip with a conical outer surface is 9-12 mm. 4. Casing equal bore pipe according to claim 1, characterized in that in the middle of the enclosing element (sleeve) the inner diameter is equal to the inner diameter of the corresponding pipe, taking into account tolerances.