Device for disconnection of drill string, drill system containing device for disconnection, and application of such system

FIELD: technological processes.

SUBSTANCE: invention relates to a drilling tool. The invention proposes a device for disconnection of a drill string, which includes in a longitudinal direction the first structure intended for attachment to a pipe of the drill string, the second structure intended for supporting a drilling cutting tool and movable relative to the first structure, and an assembly of the pusher between the above said first structure and the above said second structure. With that, the pusher assembly is intended to perform a pushing force on the above said second structure to divert the above said second structure from the above said first structure; with that, the above said pushing force is constant for any position of the second structure relative to the first structure. Besides, the pusher assembly includes a balancing mechanism containing an elastic element and an output lever, and a device for connection between the above said output lever and the above said second structure for application of the pushing force in a longitudinal direction. With that, the elastic element performs an elastic force proportional to compression of the elastic element. The output lever is connected to the above said elastic element and is capable of being rotated about an output axis. The invention also describes a drill system containing the above said device, and application of this drill system.

EFFECT: reduction of loads tested with a cutting tool at resistance in a longitudinal direction.

22 cl, 8 dwg

 

The present invention relates to a device for the separation of the drill string, a drilling system containing such a device for the separation and the application of such a system.

The use of such device for the separation occurs during the drilling of wells, such as wells for oil production. In this application, the device for separation is placed, for example, at the bottom of the well, between the device for connecting pipes and the drill string. During drilling operations, the operator, for example, activates the braking device in the mouth of the production well to control the descent of the drill string. Cutting tool, which rests on the bottom of the borehole in a geological formation, thus, assumes only a small part of the mass of pipes of the drill string.

However, when the cutting tool cuts into the rock, the strength of which greatly exceeds the total strength of the geologic formation, then he is experiencing significant load when the resistance in the longitudinal direction towards the mouth of the production well. Re-load with extreme resistance to wear of the cutting tool. However, the cutting tool has a considerable length and high cost.

The purpose of the present invention is to eliminate the tested cutting tool increased pressure during �soprotivlenie in the longitudinal direction of the drill hole.

Device for separation of the drill string according to one embodiment of the present invention contains in the longitudinal direction:

the first construction, designed for attachment to a pipe of the drill string,

the second design is intended to maintain the drilling of the cutting tool, wherein said second structure is movable, moving in the longitudinal direction relative to the first design,

where the specified device for the separation is characterized in that among other things contains a node of the pusher between said first design and said second design, the knot pusher is provided for the implementation of the pull force on said second structure for diverting a second specified structures from the first specified design, with a specified pushing force is almost constant for any position of the second Assembly relative to the first structure.

Through these structures, the device for separation one gets when experiencing a load with a resistance exceeding the load pusher. Then the cutting tool is displaced toward the device for separation, leaving a little deeper into the borehole, the contact between the cutting tool and the geological formation is weakened and the load�and the resistance on the cutting tool is reduced. Thus, the load when the resistance of the geologic formation on the cutting tool are controlled automatically by a device for separation. The cutting tool is no longer subjected to repeated extreme load with a resistance and does not wear so quickly.

In addition, the device for separation is intended for filtration of vibrations emanating from the drill string in the direction of the cutting tool, and, on the contrary, coming from the cutting tool in the direction of the drill string. Drill string and the entire drilling system in this case is exposed to fewer harmful vibrations that also facilitates the management of drilling wells.

In addition, the pushing force device for the separation is permanent for a great length of movement of the second Assembly relative to the first structure, wherein between the first position and the second position, the device for separation has a very weak own rigidity. Thus, the mass of the cutting tool, which is suspended by means of the device for separation by itself does not cause the kind of resonance, amplifying the vibration of the drilling system.

In various embodiments, the device for separation of the drill string according to the present invention can, if necessary, to resort to one�mu and/or the other of the following conditions is true:

- the second design is directed relative to the first structure in the longitudinal direction, and the pusher device comprises at least one counterbalancing mechanism including an elastic element and the output lever, wherein the elastic member produces an elastic force proportional to the compression of the elastic element, the output lever is connected with the specified elastic element and is able to rotate around an output axis, and a device for connecting between said output arm and said second structure, for the application of the specified pushing force to said second structure specified in the longitudinal direction, and a device for connecting includes roller pivotally attached for rotation relative to the output lever, at a distance from the specified output axis, resting on the surface of the connection associated with the second structure and is substantially perpendicular to the longitudinal direction;

- counterbalancing mechanism includes:

- movable element that moves when the compression of the elastic element,

- input lever pivotally attached for rotation relative to the input axis and containing the end portion in contact with the surface of the moving element, wherein said input lever is tilted at the first angle relative to perpe�dikusarov direction in the longitudinal direction,

- input gear rigidly connected with the specified input lever, and

- output gear rigidly connected with the output lever and in engagement with the input gear, and

- the output lever is inclined at a second angle relative to the longitudinal direction, wherein said second angle is equal to two specified angles to the first;

- movable element that is moved in the longitudinal direction and is able to deviate the angle of deflection relative to the specified longitudinal direction;

- the input and output gears have the shape of a sector to reduce the overall dimensions of the balancing mechanism;

the pusher device includes first and second balancing mechanisms, each of the balancing mechanism has an output axis, where the output axis are offset relative to each other in the longitudinal direction to reduce the radial distance perpendicular to the longitudinal direction, between said output axis and reducing a radial dimension perpendicular to the longitudinal direction of the pusher device;

- the input gears of the first and second balancing mechanisms are in mesh with each other;

device pusher contains a number of modules that are installed one after another in the longitudinal direction �between the first design and second design, each module provides part of the pull force on said second structure, such that the sum of those parts of the pull force is equal to the pushing force of the pusher device;

modules some modules are identical, with each module provides an identical portion of the pull force;

the pusher device comprises at least one thrust, passing through all the modules in the longitudinal direction and provided to combine modules in the first design, and each module comprises at least one pusher is provided to accept a specified portion of the pull force, wherein the pusher of one module is provided to push the pusher to the next module or to push the second design with pushing force;

- each module contains a stretching device for connecting the module to the outer tube rigidly connected to the first design;

- between each pusher and follows it by a pusher placed elastic element;

- each module contains a portion of the inner pipe and the outer pipe surrounding the inner part of the pipe where:

- part of the external tube are rigidly connected with each other and with the first design,

- portions of the inner pipes are rigidly connected with each other and with the second design, and

- each�th module provides the specified part of the efforts on part of the inner pipe of the specified module;

a pusher device positioned in the annular space located radially between the inner pipe that is designed to divert at least the liquid inside a specified inner tube, and outer tube rigidly connected to the first structure and covering said device pusher;

- the elements of the device of the pusher rigidly connected with each other by reinforcement with subsequent spontaneum to withstand the mechanical loads encountered in these United elements.

The present invention also relates to a drilling system containing a device for separation, as described above, and also containing:

- a drilling column containing at least one pipe, where the specified drill string is connected to the first design of the device for separation,

- cutting tool used for drilling geological formations, where the cutting tool is connected with the second design of the device for separation, and

device hold the drill string in the mouth of the production well provided for controlling the descent of the drill string and re-installation of the drill string in the borehole.

In various embodiments, the drilling system according to the present invention if necessary, will resort� to one and/or another of the following conditions:

device for separation containing at least one displacement sensor for determining the position of the second Assembly relative to the first structure, wherein the system comprises a transmission device for transmitting data about the specified position to the retention device to control the retention force of the drill string;

the retention force of the drill string is raised if the status indicates that the second structure is located close to the first design, and the retention force of the drill string is lowered, if the status indicates that the second design is separated from the first design,

The present invention also relates to the use of the drilling system, as described above, in which

- determine the retention force of the drill string, with the specified retention force is kept constant,

- drilled a predefined distance in the thickness of the geological formation, wherein the distance is less than the stroke of the device for separation,

- measure the angle corresponding to the angle of rotation of the cutting tool during drilling indicated a certain distance, and

- determine the depth of the groove of the specified geological formations, relative to the distance, determined by the measured angle.

In other words, the present invention relates to n�the applicatio drilling system, as described above, in which:

- determine the retention force of the drill string, with the specified retention force is kept constant,

- drilled geological formation to a predefined angle of rotation of the cutting tool,

- measure corresponding to the distance of advancement of the cutting tool during the drilling of up to a predefined angle of rotation, wherein the specified distance is the distance between the first and second design of the device for separation, and

- determine the depth of the groove of the specified geological formations, relative to the distance, determined by the measured angle.

Through these structures it is possible to determine the depth of the groove, while receiving information about the measurement from the bottom of the well. Determination of the depth of the groove in this case is very accurate.

In various embodiments, the use of a drilling system according to the present invention, if necessary, you can resort to one and/or another of the following conditions:

the retention force is equal to zero; and

- the depth of the groove allows to determine the resistance of the rocks at the bottom of the well, based on the model of the kinematic pairs of the cutting tool.

The present invention also relates to a device for separation.

In document FR-2 814 449 describes Ustra�ETS to offset the load of the pile or sheet piling type.

However, this device is only able to compensate for the weight of the load, i.e. the efforts in the vertical direction.

The purpose of the present invention is to provide compensation for the effort in any direction.

The device for separation according to one embodiment of the present invention contains in the longitudinal direction:

- first construction, designed for attachment to a pipe of the drill string,

- the second design is intended to maintain the drilling of the cutting tool, wherein the second structure is movable, moving in the longitudinal direction relative to the first design,

the knot pusher between said first design and said second design, the knot pusher is provided for the implementation of the pull force on said second structure for diverting a second specified structures from the first specified design, with a specified pushing force is almost constant for any position of the second Assembly relative to the first design,

the pusher device comprises at least one balancing mechanism containing elastic element and the output lever, wherein the elastic member produces an elastic force proportional to the compression of the elastic element, the output lever soybean�inen with the specified elastic element and is able to rotate around an output axis, where the device for separation is characterized in that the pusher device comprises at least one device for connecting between said output arm and said second structure, for the application of the pull force to said second structure specified in the longitudinal direction, and the specified device for the connection contains a roller pivotally attached for rotation relative to the output lever at a distance from the specified output axis, resting on the surface of the connection associated with the second structure and is substantially perpendicular to the longitudinal direction.

Through these structures, the device for separation is applicable for the separation of the second design the first design in either direction of specified materials vertically or in any direction of effort of disengagement relative to the vertical.

In various embodiments, the device for separation according to the present invention can, if necessary, to resort to one and/or another of the following conditions:

counterbalancing mechanism, among other things, include:

- movable element that moves when the compression of the elastic element,

- input lever pivotally attached for rotation relative to the input axis and containing frequent� the end, contact with the surface of the moving element, wherein said input lever is tilted at the first angle relative to a perpendicular direction to the longitudinal direction,

- input gear rigidly connected with the specified input lever, and

- output gear rigidly connected with the output lever and in engagement with the input gear, and

- the output lever is inclined at a second angle relative to the longitudinal direction, wherein said second angle is equal to two specified angles to the first;

- movable element, movable in the longitudinal direction and is able to deviate the angle of deflection relative to the specified longitudinal direction;

- the input and output gears have the shape of a sector to reduce the overall dimensions of the balancing mechanism;

the pusher device includes first and second balancing mechanisms, each of the balancing mechanism has an output axis, where the output axis are offset relative to each other in the longitudinal direction to reduce the radial distance perpendicular to the longitudinal direction, between said output axis and reducing a radial dimension perpendicular to the longitudinal direction of the pusher device;

the input gear pervogo second balancing mechanisms are in mesh with each other;

device pusher contains a number of modules that are installed one after another in the longitudinal direction between the first design and the second design, with each module provides part of the pull force on said second structure so that the sum of those parts of the pull force is equal to the pushing force of the pusher device;

modules some modules are identical, with each module provides an identical portion of the pull force;

the pusher device comprises at least one thrust, passing through all the modules in the longitudinal direction and provided to combine modules in the first design, and each module comprises at least one pusher is provided to accept a specified portion of the pull force, wherein the pusher of one module is provided to push the pusher to the next module or to push the second design with pushing force;

- each module contains a stretching device for connecting the module to the outer tube rigidly connected to the first design;

- between each pusher and follows it by a pusher placed elastic element;

- each module contains a portion of the inner pipe and the outer pipe surrounding the inner part of the pipe where:

- trubaindo are connected with each other and with the first design,

- portions of the inner pipes are rigidly connected with each other and with the second design, and

- each module provides the specified part of the efforts on part of the inner pipe of the specified module.

a pusher device positioned in the annular space located radially between the inner pipe that is designed to divert at least the liquid inside a specified inner tube, and outer tube rigidly connected to the first structure and covering said device pusher;

- the elements of the device of the pusher rigidly connected with each other by reinforcement with subsequent spontaneum to withstand the mechanical loads imposed on said connected elements.

Other features and advantages of the present invention will be disclosed in the ensuing description of two variants of its implementation, given as non-limiting examples in the accompanying the accompanying graphic materials.

On the drawings:

- Fig. 1 is a schematic representation of a drilling system comprising a device for separation according to the present invention;

- Fig. 2 is a view in longitudinal section of a first embodiment of a device for the separation;

- Fig. 3 is a view in perspec�the resource module of the device for separation according to Fig. 2;

- Fig. 4 is a side view of the module of Fig. 3;

- Fig. 5 is another perspective view of the module of Fig. 3;

- Fig. 6 is a perspective view of the module of the second embodiment of a device for the separation;

- Fig. 7 is a side view of the module of Fig. 6, for clarity, omitted some of the elements;

- Fig. 8 is another side view of the module of Fig. 6, for clarity, omitted other elements.

On the different figures the same references denoted by identical or similar elements.

Fig. 1 is a system 1 for drilling a bore 2 containing:

a drilling rig 3, for example, on the earth's surface or a geological formation,

- a drilling column 4, consisting of drill pipes 4a, rigidly connected to each other in length to reach the bottom of the well, located at a certain depth from the surface,

device 10 for separation, mounted on the lower end of the drill string 4, and

- cutting tool or a drilling tool or drill bit, or drill 5 mounted on the lower end of the device 10 for separation.

Drilling rig 3, for example, contains a derrick to control the pipes, driving device for actuating in rotation of the drill string 4 and the cutting tool 5 and the device 6 for delivery�ing, provided to control the descent and re-installation of the drill string 4 in the mouth of the production well 2 and to control the retention force of the weight of the drill string 4, so as to avoid undue emphasis of the cutting tool 5 in the geological formation at the bottom of the well.

In practice, the weight of the pipes of the drill string 4 may be of the order of 100 tons. For efficient operation and moderate wear of the cutting tool, the load when the resistance of the geologic formation, acting on the cutting tool 5, should be about 20 tons, i.e. almost 200000 N. Consequently, the amount of force retaining device 6 retention must be very great, and its very hard to control. Fluctuations generated due to shocks or blows of the cutting tool 5 of geological formation that are distributed through the pipes from the bottom of the well to the drilling rig 3. These fluctuations are usually used to control the amount of force retention. However, such distribution may take considerable time, for example, more than 30 seconds. Controls applied at the device level, the deduction may be carried out only with considerable delay, which increases the complexity of control retention efforts.

Fig. 2 represents a first embodiment of the device 10 for separation of the drill string. This device�ustwo is located in the longitudinal direction X and contains:

the first structure 11, or the upper connecting element is designed for attachment to a pipe of the drill string,

- the second structure 12, or the lower connecting element is designed to maintain the drilling of the cutting tool.

The second structure 12 is movable, moving in the longitudinal direction X relative to the first structure 11.

The device 10 for separation comprises an inner pipe 10a that is used for diverting at least a fluid within a specified inner tube and the outer tube 10b is rigidly connected to the first structure 11 and covering the exterior of the device 10 separation for almost its entire length in the longitudinal direction X. the Inner tube 10a and/or the outer tube 10b, if necessary, can be performed by connecting the pipes for easier installation of the device 10 for separation.

For example, the outer tube 10b can have an average diameter between 200 mm and 600 mm. for Example, the inner pipe 10a may have a mean diameter of between 40 mm and 200 mm.

The device 10 includes a separation device pusher comprising modules 13, for example, in number of 10 pieces, defined by links 131- 1310while these modules are mounted in series one behind the other in the longitudinal direction X between the first structure 11 and the second to�instrukcia 12 inside the outer tube 10b. The modules 13 are identical in the embodiment of the implementation of Fig. 2, but it is possible to install different modules with different characteristics.

Each module 13 contains:

- support structure 16, wherein the support structure 16 of a number or unit modules 13 are rigidly interconnected by means of rods 14 passing through them and connecting them to the first structure 11,

two pusher 15 passing therethrough in the longitudinal direction X and messages intended for the displacement of the second structure 12, and

- balancing mechanisms 20 provided for the implementation of the pull force of the pushers 15 in the longitudinal direction X, contributing to their displacement.

The pushing force of each of the balancing mechanism 20 is almost constant for any position of the pushers 15 relative to the support structure 16, i.e., any direction of the second structure 12 relative to the first structure 11.

The length of travel of the pushers 15 is, for example, from 50 mm to 200 mm, for example 90 mm for the presented variant of implementation.

The pushers 15 of the last module 131near the second structure 12 or the cutting tool 5 act or carry out the pushing force to the second structure 12, and the pushers 15 other modules 132- 1310act or osushestvlyaetsya the force on the corresponding Cam followers 15 following module 13 1- 139.

Modules 13 can be disposed at an angle relative to each other by means of centering elements.

Elastic elements (not shown) can also be placed between the pushers 15 adjacent successive modules, to avoid any manifestations hyperstatic connections between modules, and locking devices for the separation of 10 during its operation.

Each module 13 transmits the pushing force to the next, and they operate in parallel, wherein the second structure 12 is subjected to a pushing force, which is the sum of the pushing efforts of all balancing mechanisms 20 all modules 13 of the device 10 for separation.

According to this embodiment of the device of the pusher contains ten modules 13, each of which contains four of the balancing mechanism. The modules 13 are almost identical and produce the same pushing force. Structure 12 is subjected to a pushing force substantially equal to tenfold the force module 13 of the device for separation or forty times higher than the force counterbalancing mechanisms.

For example, if the second structure 12 must withstand the total thrust force equal to 200000 N, each module 13 produces a force of 20,000 N, and each balancing mechanism produces a force of 5000 N.

Fig. 3, 4 and 5 PR�astavliaut a detailed image of the module 13 of the device for separation 10. This module 13 contains:

- support structure 16 that is connected to the first structure 11 by means of rods 14,

two pusher 15 extending in the longitudinal direction X, and

- balancing mechanisms 20 for the implementation of the pull force in the longitudinal direction X acting on the pushers 15.

Each module 13 is located in a cylindrical annular space, passing radially between the inner pipe 10a and the outer tube 10b of the device for separation 10.

Each module 13 comprises a device 17 radial expansion coupled with a support structure 16 and is designed for rigid connection with the module 13 inside the outer tube 10b. Module 13, thus, is located inside the outer tube 10b is fixedly connected with the outer tube, using the mechanism of the radial extension 17, before placing the next module 13 inside the outer tube 10b. The modules 13 are fixed in the outer tube 10b, and each of them transmits the input force and the load the pipe, thus to reduce the manifestations hyperstatic, and to the outer tube 10b can be deformed, in particular bent when used in the mouth of the borehole, without affecting the operation of each module 13 of the device for separation.

The supporting structure 16 has the form of a rigid frame containing the first support plate 16b on the first� longitudinal end of the module, the second support plate 16c at the second longitudinal end of the module, wherein each support plate is located in a plane substantially perpendicular to the longitudinal direction, and longitudinal beams 16d connecting the first support plate 16b with the second base plate 16c. This supporting structure 16 also includes guide bearings 16a mounted on first and second base plates 16b, 16c to the direction of the transfer tappet 15 to the supporting structure 16 along the entire length of displacement.

Guides 15a is rigidly fixed in the middle part of each of the pusher 15 to receive the pushing force counterbalancing mechanism 20.

Each pusher 15 can thus be moved in the support structure 16 between the first and second bearing 16a. Guide 15a may also have the emphasis between these bearings to restrict the movement of the pusher 15 in the support structure 16.

Counterbalancing mechanism 20 transforms the force of compression of the elastic element x into rotation at a first angle θ1the input lever is then rotated to the second angle θ2the output lever. The first angle θ1has a value equal to half the magnitude of the second angle θ2: θ1= θ2/2 = θ/2.

The disclosure of the principle of operation of such a balancing mechanism can be found in patent publication FR-2627718, as well as in patent shares�tion FR-2814449. However, a counterbalancing mechanism 20 of the device 10 for separation according to the present invention implemented by a reduced size of the module 13 and its generally cylindrical shape. In addition, the present device 10 for separation of the guide contains the second Assembly relative to the first structure, so that it is compensated for the force acting in any direction, and load weight not only in the vertical direction.

Fig. 4 and 5 show the module 13, which removed some of the elements for greater clarity, balancing node that contains two counterbalancing mechanism 20a, 20b, are interconnected with each other, as described below.

This balancing node contains:

the first elastic element 21 on the first end 13a of the module 13 containing, for example, four metal spiral spring abutting the longitudinal direction X from one side of the first support plate 16b, and on the other side of the first movable element 23,

- the second elastic member 22 at the second end 13b of the module 13 containing, for example, four metal spiral spring abutting the longitudinal direction X on one side in the base plate 16c, and on the other side of the second movable element 24.

The first and second elastic elements 21, 22 are provided inside the supporting� structure 16 opposite each other in the direction of the inner part of the module, that is, the Central portion or zone specified module 13. They are installed with pre-tension and act on each of the movable elements 23, 24, so that the latter tend to shift towards each other. Thus, each of the movable elements 23, 24 has a surface opposite the surface of another element.

First counterbalancing mechanism 20a includes:

- the first input lever 25 pivotally attached rotatably around the middle of the input axis 251relative to the support structure 16 module 13 containing at each of its ends on either side of the input axis 251the roller 252, 253with the possibility of rotation relative to the specified first input lever 25, wherein the first roller 252comes in contact with the surface of the second movable element 24, the second roller 253comes in contact with the surface of the first movable element 23,

- the first input gear 27 rigidly connected to the first input lever 25,

- the first output gear 29 is pivotally connected with the possibility of rotation around the output axis 291relative to the support structure 16 module 13 and meshed with the first input gear 27 by means of teeth provided the first input and output gears 27, 29,

- first�th output lever 31, passing between the output axis 291and the end 311rigidly connected with the specified first output gear 29, and contains at its end 311the roller 312mounted rotatably relative to the specified output lever 31, wherein said roller 312comes in contact with the surface of the connection is substantially perpendicular to the longitudinal direction of the guide 15a.

The first input lever 25 is tilted at a first angle θ1= θ/2 relative to the direction that is substantially perpendicular to the longitudinal direction X.

The first output lever 31 is tilted at the second angle θ2= θ with respect to the longitudinal direction.

Second counterbalancing mechanism 20b is similar to the first balancing mechanism 20a. It contains:

- the second input lever 26 pivotally attached rotatably around the middle of the input axis 261relative to the support structure 16 module 13 containing at each of its ends on either side of the input axis 261the roller 262, 263with the possibility of rotation relative to the specified first input lever 26, wherein the first roller 262comes in contact with the surface of the second movable element 24, the second roller 263comes in contact with the surface of the first movable element 23,

- the second input �esterno 28, rigidly connected with the specified second input lever 26,

- the second output gear 30, is pivotally connected with the possibility of rotation around the output axis 301relative to the support structure 16 module 13 and meshed with the second input gear 28 by means of teeth provided to the second input and output gears 28, 30,

- the second output arm 32 extending between the output axis 301and the end 321rigidly connected with the said second output gear 30, and contains at its end 321the roller 312mounted rotatably relative to the specified output lever 32, wherein said roller 312comes in contact with the surface of the connection is substantially perpendicular to the longitudinal direction of the guide 15a.

The second input lever 26 is inclined at the third angle θ3= -θ/2 relative to the direction that is substantially perpendicular to the longitudinal direction, wherein said third angle is opposite to the first angle.

The second output arm 32 is inclined at a fourth angle θ4= -θ with respect to the longitudinal direction, wherein said fourth angle is opposite the second angle.

Also the first input gear 27 of the first mechanism 20a engages with the second input gear 28 of the second mechanism 20b, thus, Stopera and the second input gear 27, 28 rotate in opposite directions. The first and second balancing mechanisms are almost symmetric with respect to the longitudinal direction. The first and second output arms 32, 32 also rotate in different directions. But this weekend, the levers being on both sides of the guide 15a of the plunger 15 are both pushing the pusher 15 in the same direction, thus bringing their pushing efforts.

Owing to the geometry of each counterbalancing mechanism 20 (the angles of the levers), these balancing mechanisms transmit the guide 15a constant pushing force regardless of the position of the guide between the guide rails 15a bearings 16a, with the specified pushing force is directed in the longitudinal direction X.

Fig. 6 to 8 represent a second embodiment of the device for separation 10. Compared with the first embodiment of implementation, this option is simplistic. It does not contain any thrust or pusher or device for radial expansion.

In the second variant of implementation, each module 13 includes an external pipe (not represented), which simultaneously serves to provide the module 13 of the support, as do the longitudinal beams 16d of the support structure of the first variant of implementation, and to transmit the first structure 11 responses resistance push�have the force of modules 13, how do thrust 14 of the first variant implementation.

Each module 13 also includes an inner pipe of a pipe 10c designed to transmit the pull force of modules 13, as do the pushers 15 of the first variant implementation.

The outer tube of this embodiment is thus formed as a single piece, and therefore the modules 13 are arranged in series one behind the other inside the outer tube. The pipe outer pipe forms part of the module 13, where the data modules 13 just installed one behind the other, wherein each nozzle of the outer tube is adapted for rigid connection with the following or with the first design.

The inner pipe 10a of the second embodiment is also performed through the connection of branch pipe 10c of the inner pipe of each module 13. Each pipe inner pipe 10c also contains protrusions 10d with the surfaces of the connection through which the rollers 312, 322the output of the levers 31, 32 can push these nozzles 10c of the inner pipe in the longitudinal direction.

Through these structures the modules 13 are simplified and the Assembly is also simplified.

Deleted items first embodiment of the rid amount to reduce the items remaining among the main. Thus they become more durable. It also allows placing�you in each module 13 more metal springs to create elastic elements 21, 22. As a consequence, the module 13 of the second embodiment of the more productive, meaning it is able to provide greater pushing force with the same size.

In addition, in the second embodiment, the first input gear 27 of the first counterbalancing mechanism 20a no longer engages with the second input gear 28 of the second counterbalancing mechanism 20b (Fig. 6). Counterbalancing mechanisms 20 of this embodiment are more independent from each other.

The first and second movable elements 23, 24 can be moved not only in the longitudinal direction X, but also in accordance with the angles of deflection from the longitudinal direction. These angular deviations are amortized by the elasticity of the elastic elements 21, 22, and lead during rotation to overlap with the first and second input gears 27, 28, or with the first and second output gears 29, 30, these gears are pivotally connected for rotation about the longitudinal beams 16d of the support structure.

Thus, decreasing the probability of hyperstatic or blocking device for separation.

In addition, the input gear 27, 28 can be formed as a sector with a more acute angle. This angle may be, for example, more than 90° and close to 180° for input gears 27, 28 of the first variant of implementation (Fig. 5), t�GDSs as he for example, less than 45° to the input gears 27, 28 of the second variant of implementation (Fig. 6).

Thus, the gear has a smaller volume in the module 13.

Through these structures, it is possible to place more metal springs to create elastic elements 21, 22. Module 13 thus becomes even more productive. These modifications can also be applied in the first embodiment of the present invention.

For all embodiments of the present invention a device for separation may include:

a displacement sensor for determining the position of the second structure 12 relative to the first structure 11, and

a transmission device for transmitting data about the specified position to the retaining device 6 to control the retention force of the drill string.

Thanks to this information, on the situation it may be better to control the retention force required of the retention device 6, and in particular when it is necessary to decrease or increase the force retention depending on the specified position.

The device 10 for the separation of such a control system is thus often is in a state where the second structure 12 rests not in the first structure 11. In this state, the second design takes 12 predefined sense�the crucial effort set for a good functioning of the cutting tool 5. In turn, the cutting tool 5 is protected from any retaliatory efforts of resistance that exceeds the predetermined pushing force.

Device for separation can be used to accurately determine the depth of cut DOC (Depth Of Cut” in English).

Typically the depth of the groove is defined in DOC wellhead by measuring the advance of the drill string 4 in the bore and rotation of the drill string.

However, the drillstring is not fully hard, and she bent, compressed and suffers from torsional strain on its axis. Therefore, the actual rotation and forward movement of the tool in a geological formation is not known with precision. By calculation needs to be modified, but the values at the level of the tool 5 at the bottom of the well are unknown, so certain calculated values of the depth of the groove are inaccurate.

The device for separation according to the present invention now allows to obtain directly the depth of cut DOC. As a result, the second structure 12 of the device for separation of almost fixedly mounted relative to the geological formation and movement of the second Assembly relative to the second structure corresponds to the forward �Iomega tool 5 in geological formations.

Thus, the depth of cut DOC can be determined by carrying out the following stages, where:

- determine the retention force of the drill string, with the specified retention force remains constant,

- drilled a predefined distance of the geologic formation, and this distance is the distance between the first and second structures of the device 10 for separation, and less progress in the device for separation 10,

- measure the angle corresponding to the angle of rotation of the cutting tool 5 for drilling specified predefined distance, and

- determine the depth of cut DOC for a specified geological formations relative to a predefined distance by the measured angle.

Alternatively, the depth of the groove can be determined when the following stages, where:

- determine the retention force of the drill string, with the specified retention force remains constant,

- drilled to a predefined angle of rotation of the cutting tool 5 in a geological formation,

- measure the distance corresponding to the advance of the cutting tool 5 when drilling to a predetermined angle, wherein the specified distance is the distance between the first and second structures of the device 10 for separation, and

- determine the depth of cut DOC for a decree�Noah geological formations, relatively measured distance through a predefined angle.

The force of retention may be equal to zero. In this case, the braking device device 6 hold fully attenuated, and the entire weight of the drill string 4 is applied to the device 10 for separation and cutting tools 5.

As a result, the use of the device 10 for separation is very useful to determine the physical parameters of the geological formation, and, for example, resistance breeds in place of the CCS (from the English. “Confined Compressive Strength”).

Such resistance can be calculated by the model of kinematic pair of the cutting tool 5.

Model of kinematic pair is described in the document: “A Phenomenological Model for the Drilling Action of Drag Bits”, E. Detournay, P. Defourny, International Journal of Rock Mechanics and Mining Sciences &Geomechanics Abstracts, Volume 29, n°l, January 1992, pp. 13-23.

In this document the equality 22 connects the kinematic pair T, weight W and depth of cut δ (DOC here):

2Ta=(1μγz)εaδ+μγW,

- where T is the kinematic pair of rotation of the drill string 4,

- a - the radius of the cutting tool 5,

μ - coefficient of friction re�painful tool in geological formations,

- γ is the number of modeling the influence of the direction and distribution of forces at the contact between cutting tool 5 and geological formation,

- ζ is the number characterizing the bias force of the kinematic pair acting on the cutting element 5,

- ε - own specific energy, i.e. the energy required to produce unit volume of rock in a geological formation (j/m3or MPa) ,

- δ - (or DOC) is the depth of the groove, and

- W is the weight applied to the cutting tool 5.

The specific energy ε corresponds to the resistance of the rocks in place CCS.

Kinematic pair T and weight W is well known.

Precise knowledge of the depth of cut δ (or DOC) can accurately be determined using the above equality own specific energy ε, that is, the resistance of the rocks in place CCS.

1. The device (10) for separation of the drill string containing the longitudinal direction (X):
- first structure (11) that is intended for attachment to a pipe of the drill string,
the second structure (12) that is intended to maintain the drilling of the cutting tool, wherein said second structural member (12) is movable, moving relative to the first structure (11) in the longitudinal direction (X),
where the specified device for the separation is characterized in that among other things contains a node of the pusher between said first to�instrukcia and said second structure, the specified node of the pusher is provided for the implementation of the pull force on said second structure (12) for discharge of the second specified structures from the specified first design, with the specified pushing force is almost constant for any position of the second Assembly relative to the first structure, in this case,
the second structure (12) is directed relative to the first structure (11) in the longitudinal direction (X), and the pusher device comprises at least:
- balancing mechanism (20) containing an elastic element (21, 22) and the output lever (31), wherein the elastic element (21, 22) produces an elastic force proportional to the compression (x) of the elastic element, the output lever (31) is connected with the specified elastic element (21, 22) and is able to rotate around an output axis (291), and
- device for connecting between said output lever (31) and said second structure (12), for the application of the specified pushing force to said second structure (12) in the longitudinal direction (X), and the specified device for the connection contains pivotally attached pulley (312), with the possibility of rotation relative to the output lever (31) at a distance from the specified output axis (291), resting on the surface of the connection associated with the second structure (12) and practical� perpendicular to the longitudinal direction (X).

2. The device according to claim 1, characterized in that the balancing mechanism (20) also contains:
- movable element (23, 24) that moves when the compression (x) of the elastic element,
- the input lever (25) pivotally attached for rotation relative to the input axis (251and containing the end portion in contact with the surface of the moving element (23, 24), wherein said input lever (25) is tilted at the first angle relative to a perpendicular direction to the longitudinal direction (X),
- input gear (27) is rigidly connected with the specified input lever (25), and
- output gear (29) rigidly connected with the output lever (31) and being in engagement with the input gear (27), and
- the output lever (31) is inclined at a second angle relative to the longitudinal direction (X), wherein said second angle is equal to two specified angles to the first.

3. The device according to claim 2, characterized in that the movable element (23) is moved in the longitudinal direction (X) and is able to deviate the angle of deflection relative to the specified longitudinal direction.

4. The device according to claim 2, characterized in that the input gear (27) and output gear (29) has the shape of a sector to reduce the overall dimensions of the balancing mechanism.

5. The device according to claim 1, characterized in that the device tolkat�La includes first and second balancing mechanisms (20A, 20b), each of the balancing mechanism has an output axis, where the output axis (291, 301) are offset relative to each other in the longitudinal direction (X), to reduce the radial distance perpendicular to the longitudinal direction, between said output axis and reducing a radial dimension perpendicular to the longitudinal direction of the pusher device;

6. Device according to claims. 5 and 2, characterized in that the input gear (27, 28) of the first and second balancing mechanisms (20A, 20b) are in mesh with each other.

7. The device according to claim 1, characterized in that the pusher device contains a number of modules (13) installed one after another in the longitudinal direction between the first structure (11) and second structure (12), each module (13) provides part of the pull force on said second structure (12) so that the sum of these parts pushing power module (13) is equal to the pushing force of the pusher device.

8. The device according to claim 7, characterized in that the modules (13) are identical, with each module provides an identical portion of the pull force.

9. The device according to claim 7, characterized in that the pusher device comprises at least one rod (14) that passes through all the modules in the longitudinal direction (X) and created�for by to combine modules (13) in the first structure (11), and each module (13) comprises at least one pusher (15), provided to accept the specified part of the pull force, the push rod (15) of one module (13) is provided to push the plunger (15) of the next module or to push the second structure (12) with pushing force.

10. The device according to claim 9, characterized in that each module (13) comprises a stretching device (17) designed for connection module (13) with the outer tube (10b), rigidly connected to the first structure (11).

11. The device according to claim 9, characterized in that between each pusher (15) and follows it by a pusher placed elastic element.

12. The device according to claim 7, characterized in that each module (13) comprises a portion of the inner pipe (10C) and the outer pipe surrounding the inner portion of the pipe, where:
part of the external tube are rigidly connected with each other and with the first structure (11),
portions of the inner pipes are rigidly connected with each other and with the second structure (12), and
each module (13) provides the specified part of the efforts on part of the inner pipe (10C) of the specified module.

13. The device according to claim 1, characterized in that the pusher device is located in the annular space located radially between the inner pipe (10A), intended for the discharge of at least the liquid inside a specified internal�her pipe, and the outer tube (10b), rigidly connected to the first structure and covering said device pusher.

14. The device according to claim 1, characterized in that the elements of the device of the pusher rigidly connected with each other by reinforcement with subsequent spontaneum to withstand the mechanical loads encountered in these United elements.

15. A drilling system (1) comprising a device (10) for separation according to any one of claims. 1-13, and containing among other things:
- a drill column (4) containing at least one pipe (4A) where a specified drill string is connected to the first structure (11) of the device (10) for separation,
- cutting tools (5), used for drilling geological formations, where the cutting tool (5) is connected with the second structure (12) of the device (10) for separation, and
device (6) retention of the drill string (4) develop in the mouth of the well referred to control the descent of the drill string and re-installation of the drill string in the borehole.

16. A system according to claim 15, characterized in that the device (10) for separation comprises at least one displacement sensor for determining the position of the second structure (12) relative to the first structure (11), wherein the system comprises a transmission device for transmitting data about the position of ustroistvo (6) retention to control the retention force of the drill string (4).

17. A system according to claim 16, characterized in that the retention force of the drill string (4) increases if the status indicates that the second structure (12), located close to a first structure (11), and the force of retention of the drill string is lowered, if the status indicates that the second structure (12) separated from the first structure (11).

18. The use of a drilling system according to claim 16 to determine the depth of the groove in which:
- determine the retention force of the drill string, with the specified retention force is kept constant,
- drilled a predefined distance in the thickness of the geological formation, wherein the distance is less than the stroke of the device (10) for separation,
- measure the angle corresponding to the angle of rotation of the cutting tool (5) during drilling indicated a certain distance, and
- determine the depth of cut (DOC) of the said geological formations, relative to the distance, determined by the measured angle.

19. The use of a drilling system according to claim 16 to determine the depth of the groove, characterized in that:
- determine the retention force of the drill string, with the specified retention force is kept constant,
- drilled geological formation to a predefined angle of rotation of the cutting tool (5),
- suitable distance measure advancing PE�previous tool (5) when drilling to a predefined angle of rotation, this specified distance is the distance between the first and second design of the device (10) for separation, and
- determine the depth of cut (DOC) of the mentioned geological formations relative to the distance, determined by the measured angle.

20. The use according to claim 18 or 19, characterized in that the retention force is equal to zero.

21. The use according to any one of claims. 18 and 19, characterized in that the depth of cut (DOC) allows to determine the resistance of the rocks at the bottom of the well (CCS) based on the model of the kinematic pairs of the cutting tool (5).

22. The use according to claim 20, characterized in that the depth of cut (DOC) allows to determine the resistance of the rocks at the bottom of the well (CCS) based on the model of the kinematic pairs of the cutting tool (5).



 

Same patents:

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FIELD: well equipment, possible use during extraction of fluid or forcing of working agent into well with one or several beds.

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Drill string damper // 2467150

FIELD: mining.

SUBSTANCE: invention relates to borehole drives of rotation, particularly, to hydromechanical drill string dampers. Damper has tubular case to accommodate thrust piston sleeve with top and bottom thrust faces and thrust bearing with thrust face arranged between case bottom face and spring mechanism bottom face. Thrust bearing thrust face and hollow adapter bottom thrust face a stay in contact with spring mechanism bottom face. Outer tubular elements accommodating thrust bush, spring mechanism and thrust piston sleeve are integrated into single module. Annular piston is arranged inside thrust piston sleeve to reciprocate therein. Rotary drive to transmit rotation between tubular case and hollow adapter is provided with impact ring arranged in hollow adapter to allow it to displace in lengthwise direction inside thrust bush.

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4 cl, 6 dwg, 1 tbl

FIELD: construction.

SUBSTANCE: invention relates to a connection unit for use in a water-separating column (marine riser) (1). The connection unit comprises inner and outer tubular elements (21, 22), installed as capable of mutual displacement in axial direction. Tubular segments (21, 22) are connected to appropriate segments of the riser with formation of a chamber (23) with a piston (24). The piston (24) separates the chamber (23) in the radial direction into the first and second parts (25, 26) of the chamber. At the same time the first part (25) of the chamber, which in the initial position of the connection unit comprises a non-compressible fluid, is reduced in volume as the inner tubular segment (21) extends from the external tubular segment (22). According to the invention, the connection unit is equipped with a connection line (30) for fluid, stretching from one part (25) of the chamber to its other part (26). The connection unit provides for control of relative movements of tubular segments (21, 22) by means of provision of the possibility of the fluid flow to flow along the connection line (30) from one part (25) of the chamber into its other part (26).

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18 cl, 7 dwg

FIELD: mining.

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3 dwg

FIELD: oil and gas industry.

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EFFECT: improved efficiency in dampening of longitudinal direction that impact the bottom assembly of the drill stem and in calibrating of the well bore.

3 cl, 2 dwg

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