Threaded oil-field pipe joint with increased air-tightness (variants) and production method thereof (variants)

FIELD: oil and gas well forming.

SUBSTANCE: joint includes male and female tubular members with conical or cylindrical threads and thrust ends, outer and inner sealing surfaces. Inner surface of female member has conical part made as a chamfer and is terminal thread section. The end is of conical shape and tilts towards outer surface of female member relative vertical plane extending across female member axis. The conical surface mate to that of male member end and has area of transition from complete thread area to inner conical sealing surface having apex on female member axis. Transition part connected to complete thread area is cylindrical and has diameter exceeding that of thread or as a groove with triangular cross-section. One groove wall is terminal thread section. Another embodiment of the joint is also disclosed. Method for forming threaded joint adapted to connect hydraulic pressure tested oil field pipes having union nipple ends involves machining union nipple ends by cutting sealing end, turning outer conical sealing surface and outer tube surface for thread forming; cutting the thread; boring pipe to obtain fixed inner pipe diameter. One pipe end is heated by induction heating device up to t=950-980°C and upsetting tools are heated up to t≈250°C. Before upsetting the tools are lubricated with mixture containing graphite and axle oil taken with ratio of 1:8. Then heated swage and matrix perform combined upsetting of above end from inner and outer pipe surfaces. After the upsetting end plug is inserted in pipe from end to be further processed and upset surfaces are grinded for following machining. The machining process additionally includes turning thrust ledge and outer chamfer. Depression made in the form of groove with diameter less than thread diameter is formed at thrust end of union nipple. Another variant of threaded joint forming method is also disclosed.

EFFECT: increased reliability and air-tightness, improved testability and joint strength during assembling-disassembling and operation thereof.

4 cl, 16 dwg

 

The invention relates to the field of construction of oil and gas wells and can be used in casing, tubing and other pipes technological purpose with gastight connections.

Known gastight threaded connection oilfield pipes, including the covering, and covered the parts with threads and thrust the ends of the inner and outer sealing surfaces and sbeg thread on covering detail in the section between the thread with the full profile and the inner sealing surface (GOST 632-80 “casing Pipes and couplings), standards Publishing house, 1989, p.54).

The mechanism of sealing elements is to create a covering, and covered the sealing surfaces diametrically deformation - tension. Thus, screwing the gastight threaded connection with the sealing elements of the “metal-metal” thread diameters in the plane of the latter risks of sbeg thread covered items more diameters covering the details. In addition, when cutting threads on covering the details in place of sbeg thread, i.e. at the site where the drainage retinoblastoma tool on the edges of the tops of the threads on its inner diameter burrs are formed, protruding in the direction of the axis of the connection. T is thus, the presence of burrs reduces the internal diameter of the thread covering the details on the plot of her sbeg. The height of the burrs are comparable to or exceed the value of the differential between the internal radius of the thread of the plot, its rise on the covering part and the radius of the sealing surface at its beginning on covered items.

This combination Diametric dimensions of the threads, sealing surfaces and formed on the edges of the tops of famous thread on the site of its sbeg burrs leads to the fact that during the screwing-unscrewing carving burrs interact with the sealing surface covered parts deform and damage it, and on the sealing element are formed burrs. Happen as a result of injury and sticking to the sealing surface, the purity and accuracy of which are increased requirements. In addition, protruding burrs exclude the possibility of control Diametric dimensions of the sealing surfaces covering the details as they do not allow to establish a measuring tool gauge for controlled sealing surface. As a result of this reduced reliability and tightness of the connection and reduces its testability.

The closest technical solution adopted for the prototype, is gastight is ezerovo pipe includes covered and covering parts with threads and thrust the ends of the inner and outer sealing surfaces and sbeg thread on covering detail in the section between the thread with the full profile and the inner sealing surface (SU patent No. 993829, E 21 In 17/042, F 16 L 15/00, publ. 1983).

This solution is taken as a prototype for all the stated options.

However, this threaded connection has the following disadvantages.

When disassembly and Assembly of known compounds, there is a danger that under the application of torque from forming on covering the details of the burrs on the edges of the vertices on the inner diameter of the thread on the site of its rise and their interactions with high-precision sealing surface covered the details of the latter will be damaged and deformed, it formed burrs, resulting in the connection will not be hermetically sealed. Also protruding burrs exclude the possibility of control Diametric dimensions of the sealing surface of the covering part due to the inability install on it measuring tool gauge, which reduces testability threaded connections and reduce its reliability.

A known method of manufacturing a threaded connection nipple end of the oil is promyslovyh pipes, tested by hydraulic pressure strength, which consists in machining the threaded pipe end, comprising the cutting of the sealing end face, turning outer conical sealing surface, the outer surface of the pipe under the thread, followed by tapping, and the bore inner pipe diameter (SU patent No. 993829, E 21 In 17/042, F 16 L 15/00, publ. 1983).

Also known a method of manufacturing a threaded connection spigot end of oilfield pipes tested by hydraulic pressure strength, which consists in machining and spigot pipe end, comprising the cutting of the sealing end face, turning the outer surface of the pipe, the bore of the inner diameter of the pipe under the thread and the internal conical sealing surface with subsequent tapping (SU patent No. 993829, E 21 In 17/042, F 16 L 15/00, publ. 1983).

This decision was made as a prototype for the proposed methods.

These methods have low reliability and tightness of the connection is not secured testability connection.

The present invention is directed to the solution of the technical problem in the conclusion sections of the gathering thread of contact due to their placement in the assembled position of the pipe opposite sections, separating the site of the continuous pain is s from the contacting end surfaces of the nipple and the socket. In addition, the invention is directed to the solution of the technical problem on the formation of the thickened wall of the tube end by the combined landing.

Achievable technical result is to increase the reliability and integrity of the connection, ensuring testability, as well as increasing the strength of the connection when the Assembly-disassembly and maintenance.

This technical result for the first and second examples of performance is achieved by the fact that in gastight screw connection of pipes, including covered and covering the tube with conic or cylindrical threads and thrust the ends of the inner and outer sealing surfaces on the inner surface of the cover part from its free end section of the conical shape, which is a facet, and a derailment of the thread, the surface of the specified end cone with a slant towards the outer surface of a covering part with respect to a vertical plane perpendicular to the axis of the covering part, is a response to a conical thrust surface of the end of the covered parts and has the area of transition from full thread for sealing the inner surface, is made conical with the location of the vertex of the cone on the axis of the covering parts, etc is what the transition area, associated with a site with full thread, is cylindrical with a diameter larger than the thread diameter, or triangular in cross-section grooves, one of the inclined walls which is part of the gathering thread, and on the outer surface covered items sequentially from the open end response of sealing the inner surface of the covering parts o the outer conical surface plot with full thread made with chamfers in places of Assembly and is connected with a conical thrust face surface of the part through the cylindrical section of the transition, the length of which is from the thread to the cone thrust end surface is less than the length of the area of the derailment of the thread in the direction along the axis covering details.

This technical result for the first and second examples of performance is achieved by the fact that in gastight screw connection of pipes, including covered and covering the tube with conic or cylindrical threads and thrust the ends of the inner and outer sealing surfaces on the inner surface of the cover part from its free end section of the conical shape, which made the gathering thread, the surface of the specified end cone with a slant towards the outer surface coverage of the state of the workpiece relative to a vertical plane, perpendicular to the axis of the covering part, is a response to a conical thrust surface of the end of the covered parts and has a stepped transition area from a zone of full thread to seal the inner surface, provided with a tapered, with the location of the vertex of the cone on the axis of the covering part and parcel of the transition made in the form of grooves of triangular shape in cross section, one side of which is a section of the gathering thread, and on the outer surface covered items sequentially from the open end response of sealing the inner surface of the covering parts o the outer cone surface area and full thread made with chamfers in places of gathering, and associated with resistant cone end surface of the part through the cylindrical section of the transition, the length of which is from the thread to the cone thrust end surface is less than the length of the area of the derailment of the thread in the direction along the axis of the covering parts.

These characteristics are essential and interrelated with the formation of a stable set of essential features, sufficient to obtain the desired technical result.

The present invention is illustrated by a specific example, which, however, is not only possible, but clearly displayed on the et possibility of obtaining the desired technical result.

Figure 1 shows a gastight connection thread oilfield pipe Assembly, the first example embodiment;

figure 2 - gastight threaded connection oilfield pipe Assembly, the second example embodiment;

figure 3 - covering the detail of the connection of figure 1;

figure 4 is covered in detail of the connection of figure 1;

5 is a gastight connection thread oilfield pipe Assembly, the third example embodiment;

6 is a covering detail of the connection figure 5;

Fig.7 is a cross - section of the wall after the combined planting of tube end;

Fig - the first stage of mechanical treatment of nipple pipe end;

Fig.9 - the second stage of mechanical treatment of nipple pipe end;

figure 10 - the third stage of mechanical treatment of nipple pipe end threading;

11 - the fourth stage of mechanical treatment of nipple pipe end;

Fig - the first stage of machining and spigot pipe end;

Fig - the second stage of mechanical treatment and spigot pipe end;

Fig - the third stage of machining and spigot pipe end;

Fig - the fourth stage of machining and spigot end of pipe - threading;

Fig - the fifth stage of machining and spigot pipe end.

According to the present invention gastight screw Obedinenie pipes for all the examples of execution includes covered and covering the tube with conic or cylindrical threads and thrust ends, inner and outer sealing surfaces.

When this feature first and second examples of performance is that on the inner surface of the cover part from its free end section of the conical shape, which is a facet, which made the gathering thread, the surface of the specified end cone with a slant towards the outer surface of a covering part with respect to a vertical plane perpendicular to the axis of the covering part, is a response to a conical thrust surface of the end face covered in detail and the plot of the transition from full thread for sealing the inner surface, is made conical with the location of the vertex of the cone on the axis of the covering part, and the area associated with plot with full thread, is cylindrical with a diameter larger than the thread diameter, or triangular in cross-section grooves, one of the inclined walls which is part of the gathering thread, and on the outer surface covered items sequentially from the open end response of sealing the inner surface of the covering parts o the outer conical surface plot with full thread made with chamfers in places of Assembly and is connected with a conical thrust face surface is the details through the cylindrical section of the transition, length is from the thread to the cone thrust end surface is less than the length of the area of the derailment of the thread in the direction along the axis of the covering parts.

The feature of the third example of the execution is that the inner surface of the cover part from its free end section of the conical shape, which made the gathering thread, the surface of the specified end cone with a slant towards the outer surface of a covering part with respect to a vertical plane perpendicular to the axis of the covering part, is a response to a conical thrust surface of the end face covered in detail and the plot of the transition from full thread for sealing the inner surface, is made conical with the location of the vertex of the cone on the axis of the covering part and parcel of the transition made in the form of grooves of triangular shape in cross section, one the side which is part of the gathering thread, and on the outer surface covered items sequentially from the open end response of sealing the inner surface of the covering parts o the outer conical surface plot with full thread made with chamfers in places of Assembly and is connected with a conical thrust face surface of the part through the cylindrical ucast the transition length is from the thread to the cone thrust end surface is less than the length of the area of the derailment of the thread in the direction along the axis of the covering parts.

Execution of sbeg thread on its inner diameter in the form of a truncated conical surface, the apex of which is directed toward the end face covering details when placing larger base of the truncated cone at the beginning of the inner sealing surface when the diameter of the larger base of the truncated cone does not exceed the outer diameter of the thread in the same plane, and the execution of threads covering the details in the beginning with the lead-in chamfer, made in the form of a truncated conical surface, the greater base of which is placed in the plane of the end cover parts with a diameter less than the outer diameter of the thread covering the items in the same plane that allows you to push the burrs on the sbeg thread on the periphery from the axis of the connection and eliminates the danger of their interaction during disassembly and Assembly with the sealing surface and, consequently, eliminates the appearance of lesions and the occurrence of burrs performed with high precision and surface seals.

In addition, the depth of burrs inside wall covering parts eliminates the obstacles associated with failing, because the protruding burrs, control to the Libra-tube, that provides absolute control of the internal sealing surface, eliminates erroneous results when the control and, consequently, increases the reliability and integrity of the joint. To prevent reduction in strength of the connection during its operation due to stretching in the design provides for the implementation of the diameter of the larger base of the truncated cone largest smaller than the diameter in the plane of intersection of the larger base of the cone and the line of the outer diameter of the thread. This design solution while eliminating the possibility of damage and scuffing sealing surfaces increases the cross-sectional area covering parts in the most dangerous, prone to stretching, cross-section, which increases the operational reliability of the connection.

The following is a description of the specific versions of these examples.

Gastight connection of pipes for all examples of performance (1, 2, 5) contains a covered part (nipple or nipple end) 1 and the covering part (socket, or female element 2, which engage with each other by the tapered thread 3. The connection also includes thrust the ends 4 and 5 respectively covered and covering parts, which are made in the form of conical surfaces, and includes narujnuu and 7 internal sealing surface. The ends 4 and 5 and the sealing surfaces 6 and 7 communicate with each other with a certain tension. Elements of the main seal that provides a tight seal, are cooperating sealing surfaces 6 and 7.

The diametrical dimensions of the surface 6 a few more Diametric dimensions of the surface 7, so after screwing connection due to their deformation in the elastic region are formed diametrically tightness and seal metal to metal”. To ensure high reliability of sealing compound sealing surfaces 6 and 7 are performed with high precision and purity of the processing of their surfaces.

In connection 1, 2 thread 3 covering and covered parts is a fully plot with full profile. At the same time when cutting threads upon removal retinoblastoma tool on the site of sbeg thread on the edges of its vertices on its inner diameter for covering parts, burrs are formed, protruding in the direction of the axis of the connection and which, as a barrier, break the engagement and the effect on the seal. To exclude their influence on covering parts (1, 3) in the connection of figure 1 with the inner sealing surface 6 is made cylindropuntia deepening in the form of a groove 8 with a diameter exceeding the diameter is the Tr thread 3 of this part, and covered in detail in the interaction zone of the ends 4 and 5 is made hollow in the form of grooves 9 with a diameter less than the diameter of the thread. Thus, when the screwing of the nipple and socket parts of the gathering threads are always positioned in the area of the grooves, thus eliminating the influence of the surface of the thread on the site of the gathering on the accuracy of the interaction surfaces of the nipple and the socket.

In the connection 2 is a similar problem was solved with the use of grooves 10 a triangular profile in cross-section in the area between the gathering thread and the outer sealing surface 6. In the zone of interaction of the ends 4 and 5 in this example, execution as performed deepening in the form of grooves 9 with a diameter less than the diameter of the thread. In this part of this example follows the example of figure 1.

In the example of execution according to figure 5 thread 3 consists of two sections - section of the thread with a full profile 11 and sections of sbeg thread 12, which are formed when cutting at tap retinoblastoma tool to the axis of the connection. During retraction retinoblastoma tool on the site of sbeg thread on the edges of its vertices on its inner diameter, located on the truncated conical surface, burrs are formed, protruding in the direction of the axis of the connection. To eliminate the effect of sections vanishing threads for the connection of pipes in this example, execution as prescribed the s groove 9 in the zone of interaction of the ends 4 and 5 in length, not less than the section length of the gathering thread 12 from the end face 4 of a covered part, and the groove 10 of triangular section on covered parts section of the gathering threads from the inner sealing surface 7. Screwing covered and covering parts of sections vanishing thread on covering the details will always be located in the area of the grooves. For this example, execution of the covered item repeats the construction of covered items for examples of execution of figure 1 and 2.

Thus, it is possible to submit the following design features that are characteristic examples of the execution of figure 1 and 2, which provide the required technical result.

In the execution of the covering part (female):

- has a tapered inner surface with a full thread with a slope of 1:12 and the location of the imaginary vertex of the cone on the axis of the workpiece in the direction from the free end,

- has a side end of the covering part of the conical section, which made the gathering thread, with a slope of 15°greater than the slope of the ground with full thread,

- has a conical thrust face surface with a slope of 15° toward the outer surface of the cover part relative to a vertical plane perpendicular to the axis of the covering parts

there is the crossing the t zone thread to seal the inner surface, made a cone with a slope of 1:12 with the location of the imaginary vertex of the cone on the axis of the covering parts, with the first embodiment of the area associated with a site with full thread made due to the cylindrical groove with a diameter larger than the thread diameter, and according to the second embodiment of the area made in the form of grooves of triangular profile in cross-section,

- has end thrust surface from which the second step of the transition area is connected or through rounding, or through the groove.

In the execution of the covered part (nipple):

- from the open end of the covered parts are made external conical sealing surface with a taper of 1:12 with the location of the imaginary vertex of the cone on the axis of a covered part,

- has a conical outer surface with a full thread with a taper of 1:12 and chamfers in places vanishing at an angle of 60°while the imaginary apex of the cone carving is located on the axis of the part from the side of the free end,

- has a conical thrust face surface with a slope of 15° in the direction of the thread covered in detail relative to a vertical plane perpendicular to the axis of the part, which is the response surface for the thrust end surface of the covering part,

- there is a cylindrical teaching the current transition from the thread to the cone thrust end surface,

- the length of the cylindrical section of the transition from the thread to the cone thrust end surface is less than the length of the area of the derailment of the thread in the direction along the axis of the covering parts.

Design features specific to the example of execution according to figure 5 and for achieving the desired technical result below.

In the execution of the covering part (female):

- has a tapered inner surface with a full thread with a taper of 1:12, ending with the open end of this part is chamfered at an angle of 60°,

- has a side end of the covering part of the conical section, which made the gathering thread, with a slope of 15°greater than the slope of the ground with full thread,

- has a conical thrust face surface with a slope of 15° toward the outer surface of the cover part relative to a vertical plane perpendicular to the axis of the covering parts

- there is an area of transition from the thread to seal the inner surface, made in the form of grooves of triangular shape in cross section (figure 5, 6),

- has end thrust surface, which is connected through rounding the second stage of the transition area,

- the length of the cylindrical section of the transition from the thread to the cone thrust end surface coverage is emeu items more along the chamfer thread covering the details in the direction along the axis of the covering parts.

In the execution of the covered part (nipple element) this example repeats the execution of figure 1 and 2.

Gastight connection oilfield pipes works as follows.

When performing operations screwing or unscrewing of the connection initially interacts covered 1 and cover 2 parts by thread 3. In the process of screwing up is the promotion outer sealing surface 6 along an area of the groove 8 or 10 (for the examples of figure 1 and 2) or section sbeg thread 12 (for example in figure 5), then the sealing surface 7 interacts with the sealing surface 6. Due to the Diametric deformation of these surfaces creates a seal Assembly “metal-metal”.

In addition, prior to Assembly of the inner sealing surface 7 passes instrumental control using the gauge-tube. The control is carried out by setting the gauge tube at the sealing surface 7 and measure the distance from the gauge tube to the edge of the end face 5 a covering detail. Finding this distance, within certain limits, guarantees necessary for achieving air-tightness of the connection diametral deformation after screwing connection.

In the absence of opportunities to use for oilfield pipe joints with Bo is isoi wall thickness diametrical sizes of all elements of the connection, outer and inner diameters of threaded connections, including at the site of sbeg thread, and diametral dimensions of inner and outer sealing surfaces are very slightly different from each other.

When there is relative movement of the parts 1 and 2 carried the force to the contacting of the end face 4 of a covered part and the end face 5 a covering detail, resulting in the surface caused by contact voltage, the value of which must be in the region of elastic deformation. The level of contact stresses, all things being equal, is determined by the magnitude of the contacting areas of the ends 4 and 5.

To ensure the integrity of the initial thread turns at landing nipple in the socket during Assembly of the connection at the beginning of the thread covering the details of figure 1 and 2 is made of lead-in chamfer 13 in the form of a truncated conical surface, and the angle of inclination of the conical surface is greater angle of slope of the conical thread 3, for example execution in figure 5 the function of such a chamfer runs the site of the derailment of the thread 12 from the end face 4.

Improving the reliability of the connection is ensured by increasing the contact areas of the ends, which allows for increased torque screwing while maintaining the contact stresses at the appropriate level within the elastic deformation. Windows is the W process screwing covered 1 and cover 2 parts accompanied by their interaction thrust of the ends 4 and 5. The conical surface of the thrust of the ends are designed so that under the action of a axial forces that occur when the screwing threads, the transverse component of this effort is directed towards the axis of the connection. This eliminates the so-called phenomenon of “unfolding”, i.e. the lateral deformation with increasing diameter in the region of the thrust of the ends, which makes the connection less critical to the excess torque screwing and increases its reliability.

Thread 3 in a gastight connection of pipes can be made conical or cylindrical, or have a profile in the form of a trapezoid (trapezoid thread), or the profile of the working-side surface having a negative angle. In addition, gastight connection can be sinceno using primarysurface, cured after Assembly connection screw lubrication.

The advantage of the inventive threaded connections in comparison with the known results in the reliability of tightness, increasing the strength of the connection when the Assembly-disassembly and maintenance, as well as increasing its degree of testability that will allow you to use this connection pipes for liquid and gaseous media.

For the production of these pipes is a new method of making threaded connections, C localsize in the machined surfaces of the pipe ends, tested by hydraulic pressure for strength and cutting tapered threads. This before and after machining to produce heating of the ends of the pipes and their landing heated punch and matrix side of the inner and outer surfaces of the pipes with the subsequent polishing of these planted surfaces.

A feature of the operations of this method, designed for connection of these pipes is a technology combined landing pipe ends, which are not used in other and similar structures. The feature of this operation is that after cutting the connection planted on the pipe ends this landing gets full machining. Given the fact that the connection is cut in the dimensions of the relatively thin wall, the application of this technology enables the production of high-quality thread regardless of the fluctuation of the outer diameter and wall thickness in the field of their tolerances. Proven landing configuration of pipes under threading provides it with a 10-15% margin of safety relative to known methods.

The proposed method includes operations that are common to the nipple or rastrovogo pipe ends:

3.1. Test blanks pipes hydraulic pressure to the test.

3.2. Control over the size and shape of the pipe end. The pipe end is met perpendicular cut to the pipe axis, the curvature of the surface of the pipe end is not more than 1.0 mm per 1 m length.

3.3. Landing planted the pipe ends. Landing combined, i.e. crimp deformation is carried out both on the external surface of the pipe end and the inner surface (Fig.7).

The operation of the landing:

- heating the pipe ends in the device of induction heating to t=950-980°C;

the landing of the ends of the pipes in hydraulic presses landing tool;

- landing instruments (streams matrices and punches before landing a pre-warmed to t≈250°C, before planting these tools are lubricated with a mixture of graphite with an axial oil in the ratio of 1:8, and after landing - cooled water;

3.4. The grinding surfaces of the upset ends.

3.5. Before machining nipple end into the tube from the side to be processed is the end of the insert blank.

3.6. Machining nipple pipe end:

- pre-facing, turning conical sealing belt (outer sealing surface), cone under thread (when using tapered threads), the final turning of the outer diameter of the pipe (Fig);

- pruning resistant ledge, turning cervical (grooves or slits), edges, sealing conical belt, outer bevel, final facing (Fig.9;

- threading, for example, conical (figure 10);

the bore internal diameter of the pipe (11).

3.7. Machining and spigot pipe end:

- turning of the outer diameter, facing at an angle of 15° (Fig);

the bore internal diameter finally, the inner loop pre (Fig);

- pruning resistant ledge, boring conical sealing belt (inner sealing surface, the final facing (Fig);

- threading (Fig);

- turning of the outer diameter of the pipe (Fig).

Thus, the method of manufacturing a threaded connection nipple end of oilfield pipes tested by hydraulic pressure strength, is as follows:

First carry out the heating of one of the pipe ends in the device of induction heating to t=950-980°C warming and landing instruments to t≈250°C, before planting these tools are lubricated with a mixture of graphite with an axial oil in the ratio of 1:8, and then carry out a combined planting of these ends is heated by the punch and the matrix side of the inner and outer surfaces of the pipes, after the specified landing in the pipe from subject to subsequent processing of the end insert the plug and carry out grinding planted surfaces for the latter is the fact that the mechanical treatment of nipple end of the pipe, includes trimming, sealing the ends, turning the outer conical sealing surface, the outer surface of the pipe under the thread, hard ledge and the outer bevel with subsequent tapping and boring the inside diameter of the pipe.

A method of manufacturing a threaded connection spigot end of oilfield pipes tested by hydraulic pressure strength, is as follows.

First carry out the heating of one of the pipe ends in the device of induction heating to t=950-980°C warming and landing instruments to t≈250°C, before planting these tools are lubricated with a mixture of graphite with an axial oil in the ratio of 1:8, and then carry out a combined planting of these ends is heated by the punch and the matrix side of the inner and outer surfaces of the pipes, after the specified landing exercise grinding planted surfaces for subsequent machining of nipple end of the pipe, which includes the cutting of the sealing end face, turning the outer surface of the pipe, boring the internal diameter of the pipe under the thread and the internal conical sealing surface with the subsequent thread cutting and turning of the outer diameter of the pipe.

The present invention is industrially applicable as using known is echnology, used for the manufacture of the threaded ends of pipes, can be carried out on a new fundamentally different from the known structures the principle of interaction of contacting surfaces.

1. Gastight screw fittings, including covered and covering the tube with conic or cylindrical threads and thrust the ends of the inner and outer sealing surfaces, characterized in that on the inner surface of the cover part from its free end section of the conical shape, which is a facet and a derailment of the thread, the surface of the specified end cone with a slant towards the outer surface of a covering part with respect to a vertical plane perpendicular to the axis of the covering part, is a response to a conical thrust surface of the end face covered in detail and the plot of the transition from full thread to the inner surface of the sealing made conical with the location of the vertex of the cone on the axis of the covering part and parcel of the transition associated with a site with full thread, is cylindrical with a diameter larger than the thread diameter, or triangular in cross-section grooves, one of the inclined walls which is part of the gathering thread, and on the outside on top of the spine covered items sequentially from the open end response of sealing the inner surface of the covering parts o the outer cone surface area and full thread made with chamfers in places of Assembly and is connected with a conical thrust face surface of the part through the cylindrical section of the transition, the length of which is from the thread to the cone thrust end surface is less than the length of the area of the derailment of the thread in the direction along the axis of the covering parts.

2. Gastight screw fittings, including covered and covering the tube with conic or cylindrical threads and thrust the ends of the inner and outer sealing surfaces, characterized in that on the inner surface of the cover part from its free end section of the conical shape, which made the gathering thread, the surface of the specified end cone with a slant towards the outer surface of a covering part with respect to a vertical plane perpendicular to the axis of the covering part, is a response to a conical thrust surface of the end of the covered parts and has a stepped transition area from a zone of full thread to seal the inner surface made cone with the location of the vertex of the cone on the axis of the covering part and parcel of the transition made in the form of grooves of triangular shape in cross section, one side of which is a section of the gathering thread, and on the outer surface of presence covers the second part sequentially from the open end response of sealing the inner surface of the covering parts o the outer cone surface area and full thread made with chamfers in places of Assembly and is connected with a conical thrust face surface of the part through the cylindrical section of the transition, the length of which is from the thread to the cone thrust end surface is less than the length of the area of the derailment of the thread in the direction along the axis of the covering parts.

3. A method of manufacturing a threaded connection nipple end of oilfield pipes tested by hydraulic pressure strength, which consists in machining the threaded pipe end, comprising the cutting of the sealing end face, turning outer conical sealing surface, the outer surface of the pipe under the thread, with subsequent tapping and boring the inside diameter of the pipe, wherein the first carry out heating one end of a pipe in the device of induction heating to t=950-980oWith warming and landing instruments to t≈250aboutWith, before planting these tools are lubricated with a mixture of graphite with an axial oil in the ratio of 1:8, and then carry out a combined landing the specified end of the heated punch and matrix side of the inner and outer surfaces of the pipe, after the specified landing in the pipe from subject to subsequent processing of the end of the insert stub, carry out grinding planted surfaces for subsequent fur the technical processing this mechanical treatment additionally includes the turning of the thrust ledge and an outer chamfer, and in the area of the thrust end of the nipple end perform a recess in the form of a groove with a diameter less than the diameter of the thread.

4. A method of manufacturing a threaded connection spigot end of oilfield pipes tested by hydraulic pressure strength, which consists in machining and spigot pipe end, comprising the cutting of the sealing end face, turning the outer surface of the pipe, the bore of the inner diameter of the pipe under the thread and the internal conical sealing surface with subsequent tapping, wherein the first carry out the heating of one of the pipe ends in the device of induction heating to t=950-980oC and warming up landing instruments to t≈250oWith, before planting these tools are lubricated with a mixture of graphite with an axial oil in the ratio of 1:8, and then carry out a combined landing the specified end of the heated punch and matrix side of the inner and outer sealing surfaces of the pipe, after the specified landing exercise grinding planted surfaces for subsequent mechanical processing, in the beginning of the thread female end perform lead-in chamfer in the form of a truncated conic the maternal surface, and the inner sealing surface carry out a depression in the form of a groove with a diameter greater than the diameter of the thread.



 

Same patents:

FIELD: metallurgy and mechanical engineering.

SUBSTANCE: the invention is pertaining to the field of metallurgy and mechanical engineering, in particular, to development of the corrosion-resistant steel for percussion boring with improved properties concerning resistance to the corrosive fatigue. These properties are realized in the in the elongated member for the percussion boring, which has a threading and a flushing channel. The corrosion-resistant steel used for production of the boring equipment has the martensite structure with the share of the martensite from more than 50 and up to less than 100 mass % and contains Cr ≥11÷ mass % and 0.1 mass % ≤ C + N 0.8 mass %. The steel may additionally contain Mo ≤5 mass %, W ≤5 mass % and Cu ≤ 2 mass %. The composition of the steel meets the value of the index of the equivalent of resistance to a pitting corrosion (ERPC) > 10, determined according to the formula: ERPC = Cr + 3.3 (Mo + W) + 16 N, where Cr, Mo, W and N correspond to the contents of the indicated elements (in mass percents). The content of the martensite in the steel makes from 75 up to 98 mass %. The standard service life of the drill rods used for the core drilling at boring a rock - mainly from granite has increased up to 2189÷3299 drilled meters.

EFFECT: the invention ensures significantly increased standard service life of the drill rods used for the core drilling at boring a rock - mainly from granite(in drilled meters).

8 cl, 2 dwg, 1 ex

Drilling bar // 2248438

FIELD: mining industry.

SUBSTANCE: device has bushing and sleeve with inner conical thread on free end connected to the latter, and nipple with outer conical thread at free end, connected to bushing. Thread is made special locking with step p=(10..12) mm, with profile angle α=40°..70° with profile height h=(7..12) mm, while diameter of greater cone base dp is connected to outer diameter of bar D by relation D≥1.05dp with values of D from 63 mm to 245 mm, and inner diameter of bar d is connected to diameter of greater base of cone by relation d≤(0.8..0.9)dp. On outer surface of bar close to each of its ends two couples of mutually perpendicular flats are made.

EFFECT: higher efficiency.

3 cl, 3 dwg

FIELD: mining industry.

SUBSTANCE: connection and element include at least one mostly cylindrical outer thread and respectively mostly cylindrical inner thread. Outer thread is made at pipe portion, making up a solid whole with component of drilling bars. Threads include side edges and recesses placed between them. Recesses of cylindrical outer thread are placed mostly at a distance from appropriate vertexes of cylindrical inner thread, one of portions with decreased cross-section is partially composed of layer of material with higher electrode potential, than that of steel, made of nickel, chrome, tin, cobalt, titan or alloys thereof.

EFFECT: higher efficiency.

2 cl, 6 dwg, 1 ex

The invention relates to drilling equipment, and in particular to methods of controlling tension tool joints drill pipe and another tool with tapered threads

The invention relates to threaded connections mainly casing and tubing and can find application in the oil and gas industry

The invention relates to a drilling technique and can be used in coiled tubing drilling technology and repair oil and gas wells

The connection rods // 2224082
The invention relates to mining, namely, drilling rods, used for drilling bore-holes and wells

The invention relates to threaded connections for casing and tubing and can find application in the oil and gas industry

The invention relates to threaded connections for casing and tubing in oil and gas industry

The invention relates to a threaded connection to a drill string, intended for impact drilling in rock

FIELD: mining industry.

SUBSTANCE: connection and element include at least one mostly cylindrical outer thread and respectively mostly cylindrical inner thread. Outer thread is made at pipe portion, making up a solid whole with component of drilling bars. Threads include side edges and recesses placed between them. Recesses of cylindrical outer thread are placed mostly at a distance from appropriate vertexes of cylindrical inner thread, one of portions with decreased cross-section is partially composed of layer of material with higher electrode potential, than that of steel, made of nickel, chrome, tin, cobalt, titan or alloys thereof.

EFFECT: higher efficiency.

2 cl, 6 dwg, 1 ex

Drilling bar // 2248438

FIELD: mining industry.

SUBSTANCE: device has bushing and sleeve with inner conical thread on free end connected to the latter, and nipple with outer conical thread at free end, connected to bushing. Thread is made special locking with step p=(10..12) mm, with profile angle α=40°..70° with profile height h=(7..12) mm, while diameter of greater cone base dp is connected to outer diameter of bar D by relation D≥1.05dp with values of D from 63 mm to 245 mm, and inner diameter of bar d is connected to diameter of greater base of cone by relation d≤(0.8..0.9)dp. On outer surface of bar close to each of its ends two couples of mutually perpendicular flats are made.

EFFECT: higher efficiency.

3 cl, 3 dwg

FIELD: metallurgy and mechanical engineering.

SUBSTANCE: the invention is pertaining to the field of metallurgy and mechanical engineering, in particular, to development of the corrosion-resistant steel for percussion boring with improved properties concerning resistance to the corrosive fatigue. These properties are realized in the in the elongated member for the percussion boring, which has a threading and a flushing channel. The corrosion-resistant steel used for production of the boring equipment has the martensite structure with the share of the martensite from more than 50 and up to less than 100 mass % and contains Cr ≥11÷ mass % and 0.1 mass % ≤ C + N 0.8 mass %. The steel may additionally contain Mo ≤5 mass %, W ≤5 mass % and Cu ≤ 2 mass %. The composition of the steel meets the value of the index of the equivalent of resistance to a pitting corrosion (ERPC) > 10, determined according to the formula: ERPC = Cr + 3.3 (Mo + W) + 16 N, where Cr, Mo, W and N correspond to the contents of the indicated elements (in mass percents). The content of the martensite in the steel makes from 75 up to 98 mass %. The standard service life of the drill rods used for the core drilling at boring a rock - mainly from granite has increased up to 2189÷3299 drilled meters.

EFFECT: the invention ensures significantly increased standard service life of the drill rods used for the core drilling at boring a rock - mainly from granite(in drilled meters).

8 cl, 2 dwg, 1 ex

FIELD: oil and gas well forming.

SUBSTANCE: joint includes male and female tubular members with conical or cylindrical threads and thrust ends, outer and inner sealing surfaces. Inner surface of female member has conical part made as a chamfer and is terminal thread section. The end is of conical shape and tilts towards outer surface of female member relative vertical plane extending across female member axis. The conical surface mate to that of male member end and has area of transition from complete thread area to inner conical sealing surface having apex on female member axis. Transition part connected to complete thread area is cylindrical and has diameter exceeding that of thread or as a groove with triangular cross-section. One groove wall is terminal thread section. Another embodiment of the joint is also disclosed. Method for forming threaded joint adapted to connect hydraulic pressure tested oil field pipes having union nipple ends involves machining union nipple ends by cutting sealing end, turning outer conical sealing surface and outer tube surface for thread forming; cutting the thread; boring pipe to obtain fixed inner pipe diameter. One pipe end is heated by induction heating device up to t=950-980°C and upsetting tools are heated up to t≈250°C. Before upsetting the tools are lubricated with mixture containing graphite and axle oil taken with ratio of 1:8. Then heated swage and matrix perform combined upsetting of above end from inner and outer pipe surfaces. After the upsetting end plug is inserted in pipe from end to be further processed and upset surfaces are grinded for following machining. The machining process additionally includes turning thrust ledge and outer chamfer. Depression made in the form of groove with diameter less than thread diameter is formed at thrust end of union nipple. Another variant of threaded joint forming method is also disclosed.

EFFECT: increased reliability and air-tightness, improved testability and joint strength during assembling-disassembling and operation thereof.

4 cl, 16 dwg

FIELD: mining industry, particularly for oil and gas extraction from underground formation, namely to join drill pipe sections with the use of strut included in threaded pipe connection.

SUBSTANCE: metal item forming method involves mechanical deforming metal strip, for instance slotted strut formed of alloy selected from group containing Cu/Be, Cu/Sn, Cu/Ni, Cu/Ni/Sn, Cu/Zn, Cu/Si, Ni/Cr, Cu/Al, Al/Ti, Al/Mg, Al/Zn to obtain formed blank including hollow section made as truncated cone without helical slot; mechanical deforming conical section to form helical slit in it.

EFFECT: prevention of plastic threaded connection deformation, increased reliability of drill pipe connection, simplified strut production technology.

34 cl, 9 dwg

FIELD: oil industry, particularly to connect casing pipes or production strings.

SUBSTANCE: connection comprises pipes with outer cylindrical thread arranged at ends thereof, coupler with inner thread and sealing means. Pipes are provided with screw grooves located beyond the thread and having pitch equal to thread pitch. Coupler comprises shoulder extending from center of inner surface thereof and with inner cylindrical surfaces abutting the shoulder. Coupler also has ring-like or left-handed screw grooves having diameters exceeding cylindrical thread diameter. Ring-like or screw grooves are located on inner surface between thread and coupler ends. Sealing means is made as resilient rings and resilient bushes. Resilient rings are installed at coupler shoulder on inner cylindrical surfaces and may contact with end surfaces of the pipes. Resilient bushes are installed on ring-like or screw grooves of the coupler and may contact with screw grooves of the pipes.

EFFECT: increased corrosion resistance of thread exposed to well fluid.

1 dwg

FIELD: mining, particularly coupling means to connect casing pipes or tubing strings in oil and gas wells.

SUBSTANCE: coupling to connect pipes provided with tapered threads at ends thereof comprises clutch with cylindrical recess and elastic bush. Inner bush surface may cooperate with tapered thread run-out and with outer pipe surface. Outer bush surface may cooperate with cylindrical recess surface of the clutch. Metal ring is installed in joint at clutch end. The inner metal ring surface is provided with bead adapted to engage elastic bush arranged in the metal ring. Outer bush surface may cooperate with inner surface of metal ring after pipe and clutch screwing together. The bush is installed to provide cylindrical clutch groove filling.

EFFECT: prevention of sealing lubricant forcing-out, increased coupling protection against corrosive medium and electrochemical corrosion, increased reliability of well operation and reduced material consumption.

2 dwg

Threaded connection // 2287659

FIELD: threaded connection for percussion drilling on ledge rock.

SUBSTANCE: connection is made between drill rod and bushing, connected to drilling bit. Drill rod on one end has external thread, and on other end - first external surface of constant diameter, and also second external surface, positioned in axial direction between first external surface and thread. Bushing is made with internal thread and has internal end stop surface and second circular end surface. Between second end surface and internal thread, cylindrical internal surface is positioned. Second end surface of bushing is positioned in axial direction behind the end of external thread or behind a gap in thread. Internal diameter of bushing is equal to diameter of second external surface of drill rod and is less than diameter of first surface of rod. First imaginary cylinder, formed by continuation of internal surface of bushing, intersects with drill rod. Second imaginary cylinder, formed by continuation of external surface of bushing, passes outside the drill rod.

EFFECT: decreased generation of vortices during percussion drilling due to minimization of difference of dimensions between drill rod and drilling bit.

6 cl, 4 dwg

FIELD: oil and gas well construction, particularly threaded couplings and joints between rod and bit, or between rod and rod.

SUBSTANCE: air-tight threaded connection includes male and female pipes with conical threading and conical seat surfaces. The first conical surfaces cooperate with each other and are correspondingly made on outer surface of female pipe end as conical surface oblique along pipe axis and on inner surface of female pipe between conical threading and pipe body. The second conical surfaces are created on male pipe as end conical surface with oblique angle defined in pipe axis and mating end conical surface made on female pipe in transition pipe section between the first conical surface and the pipe body. Conical threading has 1:16 obliquity. Conical seat surfaces formed on outer surface of male pipe end and on inner surface of female pipe end have 1:10 obliquity in pipe axis direction. Conical end surfaces have 15° angle of taper in direction of conical threading made in corresponding pipe. Annular groove for oil forcing is made in female pipe in transition section between conical threading and pipe body. Conical Battress-type threading having 13° threading angle has threads with cross-section defining unequal-sided trapeze. Support edge of each thread extends at increased angle to load application direction.

EFFECT: increased efficiency.

3 dwg

FIELD: mining, particularly percussion rock drilling.

SUBSTANCE: male drill rod section has areas with decreased cross-sections, thread for percussion rock drilling having end and formed at male section end. Male section end has joining surface to transmit shock waves. Male section comprises the first cross-sectional area defined in zone of full thread profile and the second cross-sectional area located directly beyond the thread end. The second cross-sectional area exceeds the first one. Area length is defined as length of cylinder beginning from impact surface plane. Cylinder diameter is equal to outer thread diameter. Ratio between length and outer thread diameter is within 1 - 2. Drill bit and threaded connection between male drill rod section and drill bit are also disclosed.

EFFECT: increased fatigue resistance in area having decreased cross-section and at drill member thread bottoms.

8 cl, 8 dwg

Up!