ITMI20121434A1 - "CONNECTION DEVICE BETWEEN A DEVIATION LINE OF A LIQUID CIRCULATION FLOW AND A RADIAL VALVE OF A PITCH STRING, A INTERCEPT SYSTEM AND DEVIATION OF A LIQUID CIRCULATION FLOW IN A STRING - Google Patents

Description

DEVICE FOR CONNECTION BETWEEN A DEVIATION LINE OF A LIQUID CIRCULATION FLOW AND A RADIAL VALVE OF A STRING FOR DRILLING A WELL, SYSTEM FOR INTERCEPTION AND DEVIATION OF A FLOW OF LIQUID CIRCULATION IN A STRING OF DRILLING OF A WELL

A WELL

The present invention relates to a connection device between a deviation line of a liquid circulation flow and a radial valve of a well drilling string.

An object of the present invention also forms an interception and deviation system of a liquid circulation flow in a well drilling string.

The object of the present invention is suitable for use in the industrial sector of drilling and drilling of wells, and in particular it is dedicated to all drilling systems, such as for example those referred to by the same Applicant as â € œE-CDâ €, which allow pumping to be kept continuously active, and therefore the circulation of fluids in the well, during the operational steps necessary to add one or more modules to the battery for deeper drilling.

As is known, the aforementioned â € œE-CDâ € systems provide at least one drilling string with a substantially tubular conformation at the ends of which suitable engagement means are provided which allow it to be screwed onto further modules.

The drilling string is equipped with two valves, one of which is radial, which can be intercepted from the outside by means of an adapter, and the other, which is substantially axial.

In particular, the aforementioned adapter provides a quick connector that can be coupled to a flexible pipe, which has the function of interconnecting the pumping device in the well (â € œRig pump manifoldâ €) with the drilling string, typical of the drilling.

Going into more detail, the quick connector of the adapter has a hollow tubular structure that delimits at least one tubular compartment for the transit of drilling liquids or muds between the drilling string and the aforementioned pumping device. The hollow tubular structure of the quick connector has a first fitting or connection end on which the aforementioned flexible tube leading to the pumping device can be screwed, and a second fitting or end, arranged on the opposite side to the first, and screwable directly onto the string of perforation in correspondence of the radial valve of the latter.

In order to facilitate the screwing operations, performed on the manual command of a respective operator, the fast connector has, externally, two radial appendages which extend, transversely to the longitudinal development of the fast connector, from diametrically opposite sides. The radial appendages of the quick connector facilitate its rotation when screwing onto the drilling string.

The screwing of the quick connector allows the hermetic connection of the latter to the respective radial valve of the drilling string, so when the radial valve is in the open condition, the quick connector puts the flexible tube in fluid communication and the pumping device with the punching string.

Although the quick connector of the known adapters or connection devices allow a quick connection between the flexible tube leading to the pumping device and the respective drilling string, the Applicant has found that they are not, however, free from some drawbacks and can be improved under various aspects, mainly in relation to the speed of application of the connection device to the drilling string, the practicality of its application on the drilling string, as well as the safety of the operators during the application of the connection device to the drilling string.

In particular, the Applicant has found that the application of the known connection devices on the drilling strings requires the necessary presence of one or more operators destined to arrange the same in the correct position and the subsequent screwing of the same on the corresponding drilling string. In other words, the operators manually position, also with the aid of suitable load lifting devices, the fast connector in alignment with the radial valve of the respective drilling string. Subsequently, the operators screw the quick connector on the respective drilling string to put the latter in communication with the respective radial valve.

All these operations are carried out during the operation of the respective drilling rig and in conditions of particularly limited neighboring spaces, due to the structures, machinery and equipment present in the vicinity of the respective wells.

Naturally, these activities are particularly risky for operators who can easily get injured, even in a serious way.

The main purpose of the present invention is to provide a connection device between a deviation line of a liquid circulation flow and a radial valve of a well drilling string, as well as an interception and deviation system for a liquid circulation flow. in a well drilling string equipped with this connection device, capable of solving the problems encountered in the known art.

A further object of the present invention is to speed up the operation of applying the connection device to the respective perforation string.

Another object of the present invention is to facilitate and simplify the operation of applying the connection device to the respective perforation string.

It is also an object of the present invention to automate the operations of applying the connection device to the respective perforation string.

It is also an object of the present invention to avoid the intervention of the operators during the application phases of the connection device to the perforation string.

It is a further aim of the present invention to guarantee the safety of the operators.

The purposes specified above, and others besides, are substantially achieved by a connection device between a deviation line of a liquid circulation flow and a radial valve of a well drilling string, as well as by an interception and deviation system of a liquid circulation flow in a well drilling string, provided with such a connection device, as expressed and described in the following claims.

By way of example, the description of a preferred but not exclusive embodiment of a connection device between a deviation line of a liquid circulation flow and a radial valve of a well drilling string is now reported, as well as an interception and deviation system of a liquid circulation flow in a well drilling string provided with such a connection device, in accordance with the present invention. This description will be made hereafter with reference to the accompanying drawings, provided for indicative and therefore non-limiting purposes only, in which:

Figure 1 is a perspective representation of a connection device between a deviation line of a liquid circulation flow and a radial valve of a well drilling string, according to a first embodiment of the present invention;

Figure 2 is a partially sectional perspective representation of the connection device of the previous figure;

Figure 3 is a schematic plan view of the connection device, in accordance with a second embodiment of the present invention, shown in the engagement step on a well drilling string;

Figure 4 is a schematic plan view of the connection device, in accordance with a third embodiment of the present invention, illustrated in the engagement step on a well drilling string;

figure 5 is a schematic perspective representation of the connection device, in accordance with a fourth embodiment of the present invention;

figure 6 is a perspective schematic representation of the connection device, in accordance with a fifth embodiment of the present invention;

Figure 7 is a schematic plan view of the device of Figure 6, engaged on a respective drilling string of a well and in the open condition;

figure 8 is a schematic plan view of a detail of the device of figures 6 and 7, shown in relation to a well drilling string;

figure 9 is a variant embodiment of the detail of figure 8;

Figure 10 is a schematic plan view of a connection device, in accordance with a sixth embodiment of the present invention;

Figure 11 is a schematic plan view of a connection device, in accordance with a seventh embodiment of the present invention;

Figure 12 is an enlarged perspective representation of a locking member of the device of Figure 3;

Figure 13 is a perspective representation of a variant embodiment of the locking member of the device according to the present invention;

Figure 14 is an enlarged perspective representation of a locking member of the device of Figures 4 and 7;

figure 15 is a perspective representation of a further variant embodiment of the locking member of the device according to the present invention;

figure 16 is a perspective representation in section, of the locking member of figure 15;

figure 17 is a perspective representation of another embodiment variant of the locking member of the device according to the present invention;

figure 18 is a perspective representation of the connection device presenting a further variant embodiment of the locking member;

Figure 19 is a perspective representation of the connection device, in accordance with an eighth embodiment of the present invention;

Figure 20 is a plan view of the connection device, in accordance with a ninth embodiment of the present invention;

figure 21 is a perspective representation of the device of the previous figure;

figure 22 is a plan view of the connection device, according to a tenth embodiment of the present invention, shown in a significant condition;

figure 23 is a plan view of the device referred to in the previous figure, shown in a further significant condition;

figure 24 is a plan view of the device of the previous figure, represented in another significant condition;

Figure 25 is a perspective view of a connection interface that can be interposed between suitable manipulation means and a connection device, in accordance with a further embodiment of the present invention;

figure 26 is a perspective view of another embodiment variant of a connection interface between the manipulation means and the connection device;

figure 27 is a perspective view of a further variant embodiment of a connection interface between the manipulation means and the connection device;

figure 28 is a perspective view of a first embodiment variant of a radial valve applicable on a drilling string, in accordance with the present invention, shown in the closed condition;

figure 29 is a perspective view of the radial valve of the previous figure, shown in the open condition;

figure 30 is a schematic perspective view of a drilling string equipped with the radial valve of figures 28 and 31, shown in the open condition;

Figure 31 is a schematic perspective view of a portion of a perforation string equipped with the radial valve of Figures 28 to 29, which is shown in the open condition;

figure 32 is an exploded perspective view of the boring string and radial valve assembly shown in figures 28 to 29;

figure 33 is a schematic sectional representation of a further embodiment variant of a radial valve, shown in the closed condition;

Figure 34 is a perspective and sectional representation of the radial valve of Figure 33, shown in the closed condition;

Figure 35 is a schematic sectional representation of the radial valve of Figures 33 and 34, shown in the open condition;

figure 36 is a schematic sectional representation of a further embodiment variant of a radial valve, shown in the closed condition;

Figure 37 is a perspective and sectional representation of the radial valve of Figure 36, shown in the closed condition;

Figure 38 is a schematic sectional representation of the radial valve of Figures 36 and 37, shown in the open condition;

figure 39 is a perspective representation of a further variant embodiment of a radial valve, shown in the closed condition; figure 40 is another perspective representation of the valve of figure 39 shown in the open condition;

Figure 41 is a perspective view of another embodiment variant of a radial valve shown in the open condition;

Figure 42 is a perspective view of a further embodiment of a radial valve shown in the closed condition;

Figure 43 is a perspective view of the valve of Figure 42 illustrated in the open condition;

figure 44 is a schematic section of the valve of figure 42;

figure 45 is a perspective representation of a further variant embodiment of a radial valve shown in the closed condition;

figure 46 is a perspective representation in section of the radial valve of figure 45, shown in the closed condition;

figure 47 is a further perspective representation of the radial valve of figures 45 and 46, shown in the closed condition;

Figure 48 is a schematic sectional representation of a further variant embodiment of a radial valve, shown in the closed condition;

figure 49 is a perspective representation of another embodiment variant of a radial valve, shown in the closed condition;

figure 50 is another perspective view of the radial valve of figure 49, shown in the closed condition;

Figure 51 is a schematic sectional view of the radial valve of Figures 49 and 50, shown in the closed condition;

figure 52 is a perspective representation of a further variant embodiment of a radial valve, shown in the closed condition;

figure 53 is a perspective representation of another embodiment variant of a radial valve, shown in the closed condition;

figure 54 is a section of a further embodiment variant of a radial valve;

figure 55 is a section of another embodiment of a radial valve;

figure 56 is a perspective representation of a further embodiment of a radial valve, shown in the closed condition;

figure 57 is another perspective view of the radial valve of figure 56, shown in the closed condition;

figure 58 is a schematic section of the radial valve of figures 56 and 57, shown in the closed condition;

With reference to Figures 1 to 7, 10, 11, 15 and 18 to 24, a connection device is shown between a deviation line of a liquid circulation flow and a radial valve of a well drilling string, indicated as a whole with 1.

In particular, the connection device 1 is adapted to hydraulically connect a drilling string 2 of a well, schematically represented in Figures 1 to 4, 7 to 11, 13 to 16 and 21 to 24, through a valve radial 100 of the latter, and a flexible tube TF coming from a respective pumping device (not shown) of a deviation line LD of a liquid circulation flow. As can be seen in Figures 1 to 7, 10 to 18, 19 to 21 and 24, the connection device 1 comprises a hollow structure 3 delimiting at least one compartment 4 for the transit of a liquid (not shown).

The hollow structure 3 is advantageously switchable between an inoperative condition illustrated in Figures 5, 6 and 18 to 20, in which the connection device 1 is disengaged from the radial valve of the drilling string 2, and an operating condition shown in the figures 1 to 4, 10, 11, 13 to 16 and 21 to 24, in which the connection device 1 is engaged with the perforation string 2 in correspondence with the radial valve 100 of the latter.

When the connection device 1 is in operating condition, the compartment 4 of the hollow structure 3 is advantageously in fluid communication with the radial valve 100 of the drilling string 2 so that, when the latter is in the open condition , the connection device 1 allows the transit of a respective liquid in circulation between the deviation line LD and the perforation string itself.

In order to place the drilling string 2 in fluid communication with the aforementioned deviation line LD, the hollow structure 3 has at least one fitting 5 shown in Figures 1 to 3, 7, 15, 16, 18 and 19 to 24 advantageously joined in one piece to the same, hydraulically connectable to a transit duct of the diversion line itself, preferably the aforementioned flexible tube TF.

In accordance with an advantageous aspect of the present invention, the hollow structure 3 has at least one contact edge 6 illustrated in Figures 1 to 7, 10, 11, 15, 18 and 19 to 24, which at least partially delimits the compartment housing 4.

Advantageously, the contact edge 6 is designed to sealingly engage at least one external surface 2a of the perforation string 2, so that when the hollow structure 3 is in an operative condition, the contact edge 6 extends around the radial valve 100 of the drilling string 2. In this situation, the housing compartment 4 advantageously completely envelops the radial valve 100. In accordance with this embodiment, the compartment 4 of the hollow structure 3 defines, together with the outer surface 2a of the string of perforation 2, a respective transition chamber 7 for the circulating liquid shown in Figures 2 and 6, which is advantageously hermetically isolated from the surrounding environment and interposed between the deviation line LD and the perforation string 2.

Going into more detail, the hollow structure 3 has two contact edges 6 illustrated in figures 1, 2, 5, 6 and 19, delimiting, at least partially, the compartment 4. Each contact edge 6 is advantageously counter-shaped to the external surface 2a of the drilling string 2 whereby, when the hollow structure 3 is in operating condition, the compartment 4 completely envelops the radial valve 100 of the drilling string 2, defining, with the latter, the respective transition chamber 7 of the liquid in circulation.

Again with reference to Figures 2 and 6, the compartment 4 of the hollow structure 3, advantageously transversely wraps an entire longitudinal segment 2b, of the drilling string 2, in such a way as to hermetically isolate the latter from the surrounding environment.

Preferably, the longitudinal segment 2b to be insulated carries the respective radial valve 100 of the drilling string 2 so that also the radial valve 100 remains hermetically insulated from the surrounding environment when the hollow structure 3 is in operating condition.

In order to hermetically seal the compartment 4 of the hollow structure 3, from respectively opposite sides, and, against the external surface 2a of the drilling string 2, the hollow structure 3 is provided with at least one suitable sealing gasket 8 shown in figure 2, which isolates the points of contact between the hollow structure itself and the drilling string 2. As can be seen in figures 1, 2, 5, 6, 15, 16, 18, 19 and 21, the hollow structure 3 and the shaft 4 defined by it, have a substantially cylindrical conformation.

According to the shape of the hollow structure 3, of the compartment 4 and of the drilling string 2, the transition chamber 7 of the circulating liquid has a substantially tubular / cylindrical development, advantageously coaxial to the drilling string 2.

In accordance with the embodiments illustrated in Figures 1 to 5 and 12 to 24, the hollow structure 3 of the device 1 comprises a first shell 9 which has a first and a second sealing edge 9a, 9b arranged on opposite sides and developing on substantially parallel planes.

The first shell 9 also has a third and a fourth sealing edge 9c, 9d arranged on opposite sides and developing on respective planes, in particular a single plane substantially orthogonal to the development planes of the first and second sealing edges 9a, 9b .

The hollow structure 3 of the device 1 comprises a second shell 10 which has a first and a second sealing edge 10a, 10b arranged on opposite sides respectively and extending on substantially parallel planes, in particular coinciding with the development planes of the first and second sealing edge 9a, 9b of the first shell 9.

The second shell 10 also has a third and a fourth sealing edge 10c, 10d arranged on opposite sides and developing on respective planes, in particular a single plane, substantially orthogonal to the development planes of the first and second sealing edges 10a, 10b.

As can be seen in Figures 1 to 5, 12 to 24, the hollow structure 3 is provided with junction means 11 operatively interposed between the first and second shell 9, 10 to allow the hollow structure 3 to switch between a condition of opening shown in figures 3, 4 and 23, in which the shells 9, 10 are at least partially separated from each other, and a closed condition illustrated in figures 1, 5, 12 to 22 and 24, in which the third sealing edge 9c, 10c and the fourth sealing edge 9d, 10d of the shells 9, 10 are arranged against each other according to a tight configuration and the first sealing edge 9a, 10a and the second sealing edge 9b, 10b of the shells 9, 10 form the respective aforementioned contact edges 6 of the hollow structure 3.

In accordance with the embodiment solutions illustrated in Figures 1 and 2, the joining means 11 comprise, for the first shell 9, a pair of coupling arms 12 spaced apart from each other along a direction substantially parallel to the development longitudinal section of the hollow structure 3, and, for the second shell 10, a coupling block 13 arranged to remain between the coupling arms 12. The coupling block 13 is operatively engaged to the coupling arms 12 by means of a respective coupling pin 14 .

The assembly consisting of the coupling arms 12, the coupling block 13 and the coupling pin 14 defines a respective hinged constraint operatively interposed between the shells 9, 10 to keep the latter rotatably connected.

Again with reference to the embodiment solutions illustrated in Figures 1 and 2, the joining means 11 further comprising, on the opposite side to the respective hinge constraint 12, 13, 14, a locking member 15. The locking member 15 is operatively associated with one of the two shells 9, 10 of the hollow structure 3, preferably the second 10, and a locking tooth 16 associated with the other shell 9, 10, that is to say, the first 9.

When the hollow structure 3 is in the closed condition, the locking member 15 can be switched between an inoperative condition, in which it does not engage the locking tooth 16, leaving the shells 9, 10 substantially disjoint, and a condition operative, in which it engages the locking tooth 16 cooperating with the latter to keep the hollow structure 3 in the closed condition.

Advantageously, as can be seen in the embodiments illustrated in figures 1, 2 and 12, the locking member 15 comprises a pair of plate-like coupling elements 17 which project from a pin portion 18 rotatably engaged to the hollow structure 3 to allow the locking member 15 a predetermined rotational freedom. On the opposite side to the plate-like coupling elements 17 extends an actuation portion 19, substantially at a "U" shape.

With reference to the embodiment represented in Figure 3, the locking member 15 and the locking tooth 16 are almost identical to those described for the embodiment solutions illustrated in Figures 1, 2 and 12.

Contrary to these solutions, the joining means 11 do not provide, on the opposite side with respect to the locking member 15, the presence of a hinge, but the presence of respective coupling arms 20, 21 which can be mutually engaged by means of a respective pin junction 22.

In accordance with this embodiment, the switching of the hollow structure 3 from the closed condition to the open condition is performed by completely separating the shells 9, 10 which constitute it. In other words, the opening of the hollow structure 3 is performed by removing the locking pin 22, the disengagement of the locking member 15 from the respective locking tooth 16 and the removal of the shells 9, 10 along a substantially straight direction.

In accordance with the embodiment illustrated in Figure 5, the joining means 11 have a hinged constraint 12, 13, 14 identical to that contemplated in the embodiment solutions represented in Figures 1, 2 and 4.

Contrary to these embodiments, the solution of Figure 5 provides a locking member 23 provided with a central crosspiece 24 from whose ends two suitably spaced hinging portions 25 extend substantially parallel. The hinging portions 25 rotatably engage, by means of a corresponding rotation pin 25a, a respective hinging block 27 projecting from the second shell 10. On the opposite side to the hinging portions 25 extends an arched portion 26 which delimits, together with the central portion 24, a housing opening 27 for the operative engagement of a respective locking tooth 28 which develops from the first shell 9.

In accordance with the embodiment illustrated in Figure 13, the locking member 15 provides a plate-like element 28, bent substantially in a U-shape, from which two pivot elements 29 extend, designed to engage operatively, by means of a corresponding rotation pin 30, a respective pivot block 31 projecting from the second shell 10.

The plate-like element 28 defines an engagement seat 32 arranged to receive in engagement two locking teeth 33, 34 which extend respectively from the first and from the second shell 9, 10. When the structure 3 is in the closed condition, the locking teeth 33, 34 are mutually abutting. Advantageously, at a free end 28a of the plate-like element 28, the locking member 15 is provided with at least one, preferably two, fluid-dynamic actuators 28b, which can be switched between an inoperative condition, in which they do not engage the locking teeth 33, 34 and an operating condition, in which they press the locking teeth 33, 34 against each other.

In accordance with the embodiment illustrated in Figures 4 and 14, the locking member 15 has a central portion 35 hinged, by means of a respective pin 37, between two hinging projections 36 projecting from the second shell 10 of the hollow structure 3 From the central portion 35 extends a respective arched portion 38 designed to engage a respective locking tooth 39 projecting from the first shell 9. On the opposite side to the arched portion 38, the locking member 15 has an actuation portion 40 identical to the actuation portion 19 of the embodiment solutions of Figures 1, 2, 4 and 14.

In accordance with the embodiment shown in Figures 15 and 16, the locking member 15 comprises two arms 41 substantially parallel and transversely spaced from each other.

The arms 41 are joined, on one side, by a hooking crossbar 42 arranged to act on a respective locking tooth 16 projecting from the first shell 9, and hinged, on the other side, to a block 43 projecting from the second shell 10 The pivoting of the arms 41 to the block 43 is ensured by a respective rotation pin 44.

In accordance with the embodiment illustrated in Figure 17, the locking member 15 provides, for each shell 9, 10, a pair of teeth 45, 46 lying on the same plane and, spaced one apart from the € ™ other, along a directrix of the hollow structure 3, in such a way as to define respectively a central seat 47, 48.

When the hollow structure 3 is in the closed condition, the teeth 45 of the first shell are arranged against the respective teeth 46 of the second shell 10 and the seats 47, 48 are substantially aligned.

The locking member 15 further comprises a locking lever 49 which has a gripping portion 50 and a hinging portion 51 arranged on the opposite side to the gripping portion 50.

The hinging portion 51 is rotatably engaged at the free end of a rod 52, in turn rotatably engaged, by means of a respective rotation pin 53, between two protrusions 54 projected by the second shell 10 in proximity to the respective teeth 48. The rod 52 is free to rotate around the rotation pin 53 between a first position, in which the latter and the locking lever 49 are arranged on the opposite side to the teeth 45, 46, and a second position, in which the rod 51 extends along the seats 47, 48 between the teeth 45, 46. In this position, the locking lever 49 lies beyond the teeth 45, 46 on the side opposite the protrusions 54 and the rotation 53.

When the rod 51 is arranged in the second position, the rotating actuation of the locking lever 51, as shown in figure 17, causes a constant pressure on the teeth 45 of the first shell 9 which are pushed against the teeth 46 of the second shell 10 keeping the hollow structure 3 locked in the closed condition.

In order to increase the safety of locking, the locking member 15 also comprises a safety rod 55 which is inserted along suitable through openings 56 made along the teeth 46 of the second shell 10, substantially parallel to a directrix of the structure quarry 3.

When the rod 51 is in the second position and the safety rod 55 is inserted into the through openings 56, the safety rod 55 lies above the rod 51 in a transverse orientation.

In this way any possible movement of the rod 51 upwards, away from the hollow structure 3, is opposed by the safety rod 55. In accordance with the construction solution illustrated in figures 20 and from 23 to 28, the locking member 15 is somewhat similar to the locking member 15 of the embodiment represented in figures 15, 16.

In detail, the locking member 15 comprises two substantially parallel arms 57. The arms 57 are joined, on one side, by a coupling crosspiece 58 which is designed to act on a respective coupling tooth 16 of the first shell 9, and hinged, on the other side and by means of a respective pin of rotation 59, to a block 60 projecting from the second shell 10.

In accordance with the embodiment solutions shown in Figures 6, 7, 10 and 11, the hollow structure 3 comprises a first shell 9 having a first and a second sealing edge 9a, 9b arranged on opposite sides respectively and extending on substantially parallel planes, and a third and fourth sealing edges 9c, 9d arranged on opposite sides and developing on respective planes substantially orthogonal to the development planes of the first and second sealing edges 9a, 9b.

The hollow structure 3 comprises a second shell 10 which has a first and a second sealing edge 10a, 10b arranged on opposite sides respectively and developing on substantially parallel planes, in particular coinciding with the development planes of the first and second sealing edges 9a, 9b of the first shell 9. The second shell 10 also has a third and a fourth sealing edge 10c, 10d arranged on opposite sides respectively and developing on respective planes substantially orthogonal to the development planes of the first and second sealing edges 10a , 10b.

The hollow structure 3 is also provided with a third shell 61 which has a first and a second sealing edge 61a, of which only the first is visible in figures 6, 7, 10 and 11, arranged on opposite sides and developing on substantially parallel planes, in particular coinciding with the development planes of the first and second sealing edges 9a, 9b, 10a, 10b of the first shell 9 and of the second shell 10. The third shell 61 also has a third and a fourth edge sealing elements 61c, 61d arranged on opposite sides respectively and developing on respective planes substantially orthogonal to the development planes of the first and second sealing edges 61a.

Also for this embodiment, the hollow structure 3 provides for joining means 11.

Advantageously, the joining means 11 are operatively interposed between the shells 9, 10, 61 to allow the hollow structure 3 to switch between the open condition, in which at least two of the three shells 9, 10, 61 are, at least in part, separated from each other, and a closed condition, in which the third and fourth sealing edges 9c, 9d of the first shell 9 are arranged respectively against the fourth sealing edge 61d of the third shell 61 and the third sealing edge 10c of the second shell 10, and, the fourth sealing edge 10d of the second shell 10 is disposed against the third sealing edge 61c of the third shell 61.

Again with reference to the embodiments illustrated in Figures 6, 7, 10 and 11, the joining means 11 comprise a pair of first coupling arms 62, projecting from the second shell 10, which can be engaged, by means of a first coupling pin 63, to a respective first coupling block 64, which develops from the first shell 9.

The first coupling arms 62, the first coupling block 64 and the first coupling pin 63 define a first hinged constraint operatively interposed between the first shell 9 and the second shell 10.

Still with reference to the embodiments shown in Figures 6, 7, 10 and 11, the joining means 11 also comprise a pair of second coupling arms 65, projecting from the second shell 10 on the opposite side to the first coupling arms 62. coupling arms 65 engage, by means of a second coupling pin 66, a second coupling block 67, which extends from the first shell 9, on the opposite side with respect to the first coupling block 64.

The second coupling arms 65, the second coupling block 66 and the second coupling pin 66 define a second hinged constraint operatively interposed between the first shell 9 and the third shell 61.

As can be seen in Figures 7, 10 and 11, the hinged constraints of the hollow structure 3 allow a relative rotation between the first and second shell 9, 10 and a relative rotation between the first and third shell 9, 61 to allow the switching of the hollow structure 3 between the closed condition and the open condition.

Again with reference to the embodiment illustrated in Figures 6 to 9, the joining means 11 further provide a locking member 15 operatively associated with the second shell 10 of the hollow structure 3, and a locking tooth 16 associated with the third shell 61 of the structure slot 3, whereby, when the latter and the joining means 11 are in a closed condition, the coupling member 15 engages the coupling tooth 16 cooperating with the latter to keep the hollow structure 3 in the condition of closure.

Of course, the locking member 15 can be made according to any of the embodiments illustrated above.

By way of example, the locking member 15 can provide a solution similar to the construction solution illustrated in Figures 5, as illustrated in Figure 6, or a solution similar to the construction solution illustrated in Figures 4, 7 and 14, as shown in figure 7.

With reference to Figures 6 and 7, the first shell 9 of the hollow structure 3 extends according to an extension capable of embracing one half of the outer surface 2a of the respective drilling string 2, while the second and third shell 10, 61 each have a development capable of embracing a quarter of the external surface 2a of the perforation string 2.

With reference to the solutions schematically represented in Figures 9 to 11, in order to avoid sliding 9 between the surface 2a of the perforation string 2 and the gasket 8 placed in correspondence with the contact edge 6, during the application of the device 1 to the the drilling string itself, the first shell 9 has a development capable of embracing a third of the outer surface 2a of the drilling string 2. As can be seen in Figures 10 and 11, the second and third shell 10, 61 also have, in accordance with first shell 9, a development capable of embracing one third of the outer surface 2a of the drilling string 2.

In accordance with the embodiment solutions illustrated in Figures 19 to 21, the device 1 further comprises movement means 68 operatively associated with the hollow structure 3 to move at least one shell 9, 10 with respect to the other.

In detail, the movement means 68 are arranged to switch the hollow structure 3 between the open condition and the closed condition.

As can be seen in Figures 19 to 21, the handling means 68 comprise at least one actuator 69, in particular fluid dynamics, preferably a jack or a similar piston, active on an extension or extension 70, preferably a fork, of the respective block coupling 13 of the first shell 9.

Still with reference to the embodiment illustrated in Figure 19, the handling means 68 comprise at least one auxiliary actuator 71, in particular fluid-dynamic, preferably a jack or a similar piston, active on an extension or extension 72, preferably a fork, of the respective locking member 15. The auxiliary actuator 71 is designed to move the locking member 15, when the hollow structure 3 is in a closed condition, between an inoperative position in which it is disengaged from the respective tooth lock 16, and an operative position, in which it engages the locking tooth 16 to keep the hollow structure 3 in the closed condition.

In accordance with the embodiment illustrated in Figure 19, both the actuator 69 and the auxiliary actuator 71 are carried by a common support 73.

In detail, both the actuator 69 and the auxiliary actuator 71 are hinged, on one side, to the common support 73, and on the other, respectively to the block 13 of the first shell 9 and to the locking member 15 , in such a way as to assume an inclined orientation with respect to the common support itself during the opening of the hollow structure 3 and the movement of the locking member 15.

In accordance with the embodiment illustrated in Figures 20 and 21, the common support 73 is particularly short so that the actuators 69, 71 always remain in an inclined position with respect to the common support 73.

Preferably, the actuator 69 is hinged, on one side, to one end of the common support 73, and on the other, to two arms 9e which extend from the first shell 9, from the hinging area of this one. ™ last to second shell 10.

An object of the present invention also forms an interception and deviation system of a liquid circulation flow in a drilling string 2 of a well.

In detail, the interception and diversion system provided comprises the above-described connection device 1 made according to any one of the embodiments illustrated.

The system advantageously comprises at least one radial valve 100 which can be installed on a side opening 2c, shown in figures 34 and 35, of a respective drilling string 2.

As can be seen in Figures 30 to 58, the radial valve 100 has a substantially cylindrical or discoidal body 101, provided with at least one through opening 102 for the transit of a liquid from one part of the valve to the other.

The radial valve 100 is also provided with a closing element 103 rotatably engaged on the body 101 and switchable between a first position shown in figures 28, 30, 33, 34, 36, 37, 39, 42, from 44 to 47, from 49 to 51, 52, 53 and 56 to 58, in which the through opening 102 is blocked by the closing element 103, and a second position illustrated in figures 29, 31, 35, 38, 40, 41 and 43, in which the through opening 102 is disengaged from the closing element 103.

Advantageously, the body 101 of the radial valve 100 has a plurality of through openings 102 circumferentially distributed around a center 101a of the body 101. Similarly, the closing element 103 has a plurality of obturator portions 103a rotatable together with the closing element closure 103 between the first position, in which each through opening 102 is occluded by at least a part of a shutter portion 103a of the closing element 103, and a second position, in which at least one through opening 102 is disengaged from the closing element 103.

In particular, the closing element 103 rotates between the first and second position on a plane substantially parallel to the plane of the through openings 102 and in an arcuate direction, transversal to the direction of transit of the liquid.

Preferably, the number of through openings 102 is equivalent to the number of shutter portions 103a of the closing element 103.

In detail, each through opening 102 is closed by a respective shutter portion 103a when the closing element 103 is operated from the first to the second position. In accordance with the embodiments illustrated in Figures 36 to 58, each through opening 102 advantageously has a shape having dimensions smaller than the dimensions of the respective shutter portion 103a of the closing element 103 so that, when the latter is in the second position, each shutter portion 103a completely and hermetically covers and closes the corresponding through opening 102.

In accordance with the embodiment illustrated in Figures 28 to 35, each through opening 102 has an external perimeter edge 102a delimiting a shape having the same shape and the same dimensions as the shape of the respective shutter portion 103a of the closing element 103 , and an inner perimeter edge 102b, in particular substantially parallel to the outer perimeter edge 102a, defining a shape having dimensions smaller than the respective shutter portion 103a of the closing element 103. In this case, the closing element 103 is It is advantageously axially translatable so that each shutter portion 103a of the closing element 103 occupies the respective through opening 102 according to a position abutting the internal perimeter edge 102b when the closing element 103 is in the second position, and rests to the body 101 of the valve 100, leaving the respective through opening 102 free, when the closing element 103 is in the first position.

With reference to the embodiment solutions illustrated in Figures 33 to 38, the radial valve 100 advantageously comprises suitable elastic return means 104, preferably at least one helical spring 104a, operatively interposed between the body 101 of the valve 100 and the closing element 103, to move each shutter portion 103a away from the internal perimeter edge 102b of the respective through opening 102 and allow the closing element itself to reach the first position.

As can be seen in the embodiment represented in Figures 33 to 43, the helical spring 104a is advantageously housed inside a seat 101b obtained in the center 101a of the body 101 of the valve 100, around a stem 103b of the closure 103, and held in this seat 101b by an appropriate nut 105 or similar element screwed onto the stem 103b of the closure element 103.

According to this solution, the helical spring 104a lies inside the perforation string 2 when the radial valve 100 is engaged in the corresponding opening 2c.

In accordance with the embodiment illustrated in Figures 36 to 38, the helical spring 104a is advantageously housed inside a seat 103c obtained in a central area 103d of the closing element 103, around a projecting stem 101c from the center 101a of the body 101 of the valve 100. The helical spring 104a is held in the seat 103c by an appropriate nut 105 or similar element screwed onto the stem 101c of the body 101 of the valve 100.

In accordance with the embodiment solutions illustrated in Figures 37, 38, 40, 41, 52, 53 and 56, the body 101 of the valve 100 has, for each through opening 102, a corresponding shoulder 101d for supporting the limit switch, designed to define a stop edge for the respective shutter portion 103a of the closing element 103.

In accordance with the embodiments illustrated in Figures 42 to 48, 49 and 52 to 54 and 55, the body 101 of the valve 100 has, in correspondence with each through opening 102, at least one hooking tooth 101e which protrudes from a perimeter edge 101f of the body itself, overlapping the respective through opening 102.

In detail, each hooking tooth 101e provides a respective stop edge for the respective shutter portion 103a of the closing element 103 on the opposite side with respect to the body 101 of the valve 100.

When the closing element 103 is in the second position, each shutter portion 103a is interposed between the respective hooking tooth 101e and the respective through opening 102.

In accordance with the embodiment solutions illustrated in figures 41 to 43, 45, 46, 49, 51, 61, 56 and 58, the closing element 103 has a plurality of reinforcing ribs 106 which each develop, preferably at least one pair, on a respective shutter portion 103a of the closing element itself.

In accordance with the embodiment illustrated in figures 47, 50, 51, the body 101 of the valve 100 has a plurality of reinforcing ribs 107, each of which preferably extends between two angularly adjacent through openings 12.

With reference to the embodiments illustrated in figures 28 to 31, 33 to 46, 48 to 53, and 56 to 58, the closing element 103 is hinged to the center 101a of the body 101 of the valve 100.

In accordance with the embodiment solutions illustrated in figures 45, 46, 49, 51, 54 to 56 and 58, the closing element 103 is hinged to the stem 101c or to a similar protuberance, which is advantageously traversed longitudinally a vent channel 108 provided with a respective vent adjustment screw 108b shown in figures 51 and 58.

As visible in figures 54 and 55, the vent channel 108 is equipped with at least one, preferably two or more, lateral ducts 108 which extend transversely to the stem 101c, and at least partially through the closure element 103 illustrated in the figure 51.

With reference to the embodiment solutions illustrated in Figures 31 to 38 and 49, the valve is also provided with an auxiliary structure 109, of substantially discoidal conformation and having counter-shaped portions at the opening 2c of the respective drilling string 2. The auxiliary structure 109 is designed to remain inside the opening 2c of the drilling string 32 when the valve 100 is installed on the latter. With reference to the embodiment solutions illustrated in Figures 36 to 38 and 48, the valve 100 can also be provided with a one-way closing element 110 which allows the passage of a liquid only towards the inside of the drilling string 2.

In detail, the unidirectional closing element has a substantially discoidal body designed to block a central opening 109a of the auxiliary structure 109 when the pressure inside the drilling string is greater than the pressure detected by the other part of the valve 100.

As shown in the embodiment solutions illustrated in Figures 49 to 51, 52, 56 and 58, the closing element 103 is advantageously retained in engagement on the body 101 of the valve 100 through a respective stop 111 which can be constituted by a single fork illustrated in figures 49 and 52, or by two substantially identical forks shown in figures 48 and 53, or by a ring nut visible in figures 56 and 58.

The aforementioned system also comprises manipulation means (not shown) operatively active on the connection device 1 to automatically apply the latter on the drilling string 2, in correspondence with the radial valve 100.

The manipulation means can be implemented between: an inoperative condition, in which they remain at rest and do not engage the connection device 1; a gripping condition shown in Figures 25 to 27, in which they intercept the connection device 1; a manipulation condition visible in Figures 25 to 27, in which they predispose the connection device 1 to the engagement of the perforation string 2; a movement condition, in which they move the connection device 1 between the inoperative condition of Figure 27 and the operative condition of Figure 25; a clamping condition, in which they fix the connection device 1 in operating condition on the perforation string 2 illustrated in Figure 25; and, a disengagement condition, in which the applied connection device 1 disengages. The manipulation means comprise at least a mechanical arm (not shown) or a similar handling device, at the free end of which an appropriate gripping member (not shown) capable of gripping a respective connection interface 200 shown is advantageously mounted in figures 25 to 27.

In accordance with the embodiment illustrated in Figure 25, the connection interface 200 between the connection device 1 and the handling means, comprises a pair of substantially identical support plates 201, arranged, advantageously parallel to each other. to the other. The support plates 201 are joined by a transverse interconnection bar 202, substantially perpendicular.

From each support plate 201 extend, away from the other support plate 202, a pair of attachment projections 203, arranged one above the other.

A corresponding damper 204, preferably of the pneumatic type, is advantageously hinged to each attachment projection 203 of each support plate 202. Each pair of dampers 204 is integral, on the opposite side with the respective support plate 201, to a common engagement flange 205 substantially shaped like a â € œCâ € which is in turn hinged to the hollow structure 3, in correspondence with the second shell 10.

In accordance with the embodiment illustrated in Figure 26, the connection interface 200 between the connection device 1 and the handling means comprises a pair of substantially identical support plates 201, arranged advantageously parallel to each other. to the other.

Each support plate 201 has a substantially rectangular portion 201a from which two attachment projections 203 extend.

As visible in Figure 26, the portion 201a is located in the internal part of the respective support plate 201 and the attachment projections 203 extend towards the other support plate 201.

Still with reference to the embodiment illustrated in Figure 26, a respective damper 204 is hinged to an attachment projection 203, preferably the one arranged in correspondence with the respective support plate 201, while the other attachment projection 203, preferably the one spaced from the respective support plate 201, a support rod 206 is hinged.

Each damper 204 is also hinged, on the opposite side to the respective attachment projection 203, to a free end 207a, of a corresponding support bar 207 which extends between the connection interface 200 and the connection device 1 .

Similarly, each support rod 206 is hinged to an intermediate portion 207b of each pair of support bars 207, preferably between the free ends 207a of the latter and respective attachment ends 207c engaged to the hollow structure 3, in particular to the second shell 10 of the latter. In accordance with the embodiment illustrated in Figure 27, the connection interface 200 comprises a pair of substantially identical support plates 201 arranged, advantageously parallel to each other.

Each support plate 201 has, internally, a support portion 201b which projects from the respective support plate towards the other support plate 201b and towards the hollow structure 3.

Hinged to each support portion 201b is a first pair of arms 208 which are hinged, on the opposite side from the support portion 201, to a respective intermediate connection plate 209.

A pair of second arms 210 is also hinged to each intermediate connection plate 209, which are hinged, on the opposite side to the respective intermediate connection plate 209, to the hollow structure 3, in particular to the second shell 10 of the latter.

Between each support plate 201 and the respective intermediate connection plate 2 there is operatively interposed at least one helical spring 211 or a similar elastic member.

Advantageously, each intermediate connection plate 209 has an internal support structure 209a to which one end of a respective damper 204 is operatively engaged.

In detail, the damper 204 extends between the two intermediate connection plates 209 transversely to the support plates 201 and to the intermediate connection plates 209 themselves.

The present invention solves the problems encountered in the known art and achieves important advantages.

First of all, the object of the present invention allows the automation of the operation of interception and deviation of a liquid flow in circulation in a respective drilling string. Therefore, this operation is carried out faster and without any risk for the operators. In other words, the particular shape of the connection device and the predisposition of the handling system allow the application of the connection device on the respective drilling string without requiring any intervention by the operators who can keep an appropriate distance of safety.

Claims (12)

CLAIMS 1) Connection device (1) between a deviation line (LD) of a liquid circulation flow and a radial valve (100) of a well drilling string (2), called connection device (1) comprising a hollow structure (3) delimiting at least one compartment (4) for the transit of a liquid, said hollow structure (3) having at least one fitting (5) hydraulically connectable to a transit duct (TF) of a deviation line ( LD) of a circulation flow of a liquid, said hollow structure (3) being switchable between an inoperative condition, in which said device (1) is disengaged from said radial valve (100) of said drilling string (2) , and an operating condition, in which said device (1) is engaged to said radial valve (100) of said drilling string (2) and said compartment (4) of said hollow structure (3) is in fluid communication with said radial valve (100) therefore, when the latter is in co opening condition, said connection device (1) allows the transit of said liquid between said deviation line (LD) and said perforation string (2), characterized in that said hollow structure (3) has at least one contact edge (6) delimiting, at least partially, said compartment (4), said contact edge (6) being able to sealingly engage at least one external surface (2a) of said perforation string (2) so that when said hollow structure (3 ) Is in operating condition, said compartment (4) completely envelops said radial valve (100) of said drilling string (2), said compartment (4) of said hollow structure (3) defining, together with said external surface (2a ) of said perforation string (2), a respective transition chamber (7) of said liquid, hermetically isolated from the surrounding environment and interposed between said deviation line (LD) and said perforation string (2). Device according to claim 1, wherein said hollow structure (3) has two contact edges (6) delimiting, at least partially, said space (4), each contact edge (6) being counter-shaped to an external surface (2a ) of said perforation string (2) so that when said hollow structure (3) is in operating condition, said compartment (4) completely envelops said radial valve (100) of said perforation string (2), defining, with said external surface (2a) of said perforation string (2), a respective transition chamber (7) of said liquid, hermetically isolated from the surrounding environment and interposed between said deviation line (LD) and said perforation string (2 ), said compartment (4) of said hollow structure (32) transversely wrapping an entire longitudinal segment (2b) of said perforation string (2), in correspondence with which said radial valve (100) is arranged, said contact edges (6) of said hollow structure ( 3) hermetically sealing said compartment (4), from opposite sides, and in correspondence with said external surface (2a) of said perforation string (2). 3. Device according to claim 2, wherein said hollow structure (3) and said compartment (4) have a substantially cylindrical conformation, said transition chamber (7) of said liquid, defined between said hollow structure (3) and said surface (2a) of said perforation string (2), presenting a substantially tubular / cylindrical development, in particular coaxial to said perforation string (2). Device according to the preceding claim, wherein said hollow structure (3) comprises: a first shell (9) having a first and a second sealing edge (9a, 9b) arranged on opposite sides and extending on substantially parallel planes, and a third and a fourth sealing edge (9c, 9d) arranged on each side respectively opposite and extending on respective planes, in particular a single plane, substantially orthogonal to the planes of development of the first and second sealing edges (9a, 9b); a second shell (10) having a first and a second sealing edge (10a, 10b) arranged on opposite sides respectively and extending on substantially parallel planes, in particular coinciding with the development planes of the first and second sealing edges (9a, 9b) of said first shell (9), and a third and fourth sealing edges (9c, 9d) arranged on opposite sides and developing on respective planes, in particular a single plane, substantially orthogonal to the development planes of the first and of the second sealing edge (10a, 10b); junction means (11) operatively interposed between said first and second shells (9, 10) to allow the switching of said hollow structure (3) between an open condition, in which said shells (9, 10) are at least partially separated one from the other, and a closed condition, in which said third and fourth sealing edges (9c, 9d, 10c, 10d) of said shells (9, 10) are arranged one against the other The other according to a tight configuration and said first and second sealing edges (9a, 9b, 10a, 10b) of said shells (9, 10) form the respective contact edges (6) of said hollow structure (3). 5. Device according to the preceding claim, wherein said joining means (11) comprise for each shell (9, 10) of said hollow structure (3) a pair of coupling arms (12), engageable to a respective coupling block (13), by means of a respective coupling pin (14), said joining means (11) further comprising, on the opposite side to said arms and coupling block (12, 13), a locking member (15) operatively associated with a shell (9, 10) of said hollow structure (3) and a locking tooth (16) associated with the other shell (9, 10) of said hollow structure (3) so when the latter is said joining means (11) are in a closed condition, the locking member (15) engages said locking tooth (16) cooperating with the latter to keep said hollow structure (3) in the closed condition. 6. Device according to the preceding claim, in which said coupling arms (12), coupling block (13) and coupling pin (14) form a respective hinged constraint, said shells (9, 10) being rotatable one with respect to the other to allow the movement of said hollow structure (3) between the open condition and the closed condition. Device according to claim 3, wherein said hollow structure (3) comprises: a first shell (9) having a first and a second sealing edge (9a, 9b) arranged on opposite sides respectively and extending on substantially parallel planes, and a third and a fourth sealing edge (9d, 9c) arranged on each other side opposite and extending on respective planes substantially orthogonal to the development planes of the first and second sealing edges (9a, 9b); a second shell (10) having a first and a second sealing edge (10a, 10b) arranged on opposite sides respectively and developing on substantially parallel planes, in particular coinciding, with the development planes of the first and second sealing edges (9a , 9b) of said first shell (9), a third and fourth sealing edges (10c, 10d) arranged on opposite sides respectively and developing on respective planes substantially orthogonal to the development planes of the first and second sealing edges (10a , 10b); a third shell (61) having a first and a second sealing edge (61a, 61b) arranged on opposite sides and developing on substantially parallel planes, in particular coinciding, with the development planes of the first and second sealing edges (9a , 9b, 10a, 10b) of said first shell (9) and of said second shell (10), a third and a fourth sealing edge (61c, 61d) arranged on opposite sides respectively and developing on respective planes substantially orthogonal to the planes development of the first and second sealing edges (61a, 61b); junction means (11) operatively interposed between said shells (9) to allow the switching of said hollow structure (3) between an open condition, in which at least two of said three shells (9, 10, 61) are, at least in part, separated from each other, and a closed condition, in which said third and fourth sealing edges (9c, 9b) of said first shell (9) are respectively arranged against the fourth sealing edge (61d ) of the third shell (61) and the third sealing edge (10c) of the second shell (10), and said fourth sealing edge (10d) of said second shell (10) is disposed against said third sealing edge (61d ) of said third shell (61). 8. Device according to claim 7, wherein said joining means (11) comprise: a pair of first coupling arms (62), engageable, by means of a respective first coupling pin (63), to a respective first coupling block (64), said pair of first coupling arms (62), said first coupling block coupling (64) and said first coupling pin (63) being operatively interposed between said first and second shell (9, 10) of said hollow structure (3); a pair of second coupling arms (65), engageable, by means of a respective second coupling pin (66), to a respective second coupling block (67), said pair of second coupling arms (65), said second coupling block coupling (66) and said second coupling pin (67) being operatively interposed between said first and third shell (9, 61) of said hollow structure (3); a locking member (15) operatively associated with one of said second and third shells (10, 61) of said hollow structure (3) and a locking tooth (16) associated with the other shell (10, 61) of said hollow structure (3) whereby, when the latter and said joining means (11) are in a closed condition, the coupling member (15) engages said locking tooth (16) and cooperates with this last to keep said hollow structure (3) in the closed condition. 9. Device according to claim 6 or 8, further comprising movement means (68) operatively associated with said hollow structure (3) for moving at least one shell (9, 10) with respect to another, said movement means (68) being adapted to switch the hollow structure (3) between the open condition and the closed condition, said movement means (68) comprising at least one actuator (69), in particular fluid-dynamic, active on one of said shells (9, 10) of said hollow structure (3). 10. Device according to claim 9, wherein said moving means (68) comprise at least one auxiliary actuator (71), in particular fluid-dynamic, operatively connected to said locking member (15) to move the latter, when said structure hollow (3) is in a closed condition, between an inoperative position in which it is disengaged from said locking tooth (16), and an operative position, in which it engages said locking tooth (16) to maintain said hollow structure (3) in the closed condition. 11. Device according to any one of the preceding claims, in which said hollow structure (3) of said connection device (1) ensures the engagement of the latter to said perforation string (2) in the absence of orientations and / or predefined positions of the latter, called hollow structure (3) allowing the engagement between said connection device (1) and said drilling string (2) in any operative position of the latter. 12. System of interception and deviation of a circulation flow of a liquid in a drilling string (2) of a well, characterized in that it comprises: at least one connection device (1) according to any one of the preceding claims; at least one radial valve (100) installable on a lateral opening (2c) of a respective perforation string (2), said radial valve (100) having a substantially cylindrical or disc-shaped body (101), provided with at least one through opening (102) for the transit of a liquid from one part of said radial valve (100) to the other, and a closing element (103) rotatably engaged on said body (101) and switchable between a first position, in wherein said through opening (102) is closed by said closing element (103), and a second position, in which said through opening (102) is disengaged from said closing element (103); manipulation means operatively active on said connection device (1) for automatically applying the latter to said perforation string (2), in correspondence with said radial valve (100), said manipulation means being operable between: a non-operational condition, in which they remain at rest; a gripping condition, in which they intercept said connection device (1); a manipulation condition, in which they predispose said connection device (1) to the engagement of said perforation string (2); a moving condition, in which they move said connection device (1) between the inoperative condition and the operative condition; a clamping condition, in which they fix said connection device (1) in an operative condition on said perforation string (2); a disengagement condition, in which said connection device (1) disengages from said perforation string (2).