Hydraulic catcher

FIELD: underground (fundamental) maintenance of wells, possible use for extracting equipment stuck at the face.

SUBSTANCE: device contains body and spindly connected to working column and object being freed, connected by screw couple to lifting angle, providing for its non-self-braking mobility and forming a "cylinder-piston" couple with hollow, filled with liquid with forming a part of hollow in bored interval of cylinder. Connection of body and spindle is made with possible induction of angular and axial acceleration onto working column with following application of torsion and axial strike. When torsion strikes are required in reverse direction screw couple is made with reverse thread.

EFFECT: increased efficiency of operation, expanded functional capabilities.

1 dwg

 

The invention relates to the oil and gas industry and can be used in the construction and repair of wells to release stuck in a wellbore equipment ("object") blows.

Known Iasi, consisting of a body and a spindle, which is connected with the working string and object, and between themselves - with some backlash and form a movable telescopic pair. In addition, when between the working string and the object torque acts specified in the telescope is in the form of a pair of slotted for the perception and transmission of torque. The above Iasi historically used from the very beginning of the development of the oil and gas industry and has universal acclaim, so the reference to literary sources are not cited.

Its principal drawback is the weak force of the shock, since the latter is determined by the kinematic energy of the translational motion of the working column, which usually has a small value.

As the closest analogue is selected hydraulic Iasi where to strike uses the energy of elastic deformation of the working column (1). In this arrangement, the hydraulic Yassa United slotted pair with backlash body and stem are a couple of "cylinder-piston", which forms a closed working cavity filled with liquid. In the initial interval of movement (within the specified backlash) radial clearance between the piston and cylinder are made very small and so here on the piston, there is a considerable pressure drop, which is the loading of the working of the column axial force which causes the elastic deformation of the tension or compression. When in the process of the relative movement in the cylinder the piston reaches the interval, where the gap between them is made many times larger the differential pressure on the piston decreases sharply and strain working column due to the reduction of the load on the piston returns to its original length, resulting in the Yassa intense axial impact of a mass of the bottom of the working column, which is transmitted to the released object.

To the disadvantage of hydraulic Yassa can be attributed to the limited functionality expressed in the inability of excitation along with axial and additional torsional shock, which, as is known from the field of practice, can significantly increase the probability of extracting a stuck downhole equipment. Creating additional torsional shock can also be imperative, and by loosening the screw connections over the stuck object when removing it piece by piece.

Another disadvantage is rototype is its lack of effectiveness, especially when conducting emergency operations in horizontal sections of the wells. Indeed, despite the implementation of slot pairs, allowing the torque transmission stuck object, in commercial practice, as a rule, in such cases, there are difficulties in the transmission of torque from the surface to the bottom. On the other hand, the above-mentioned hydraulic Yassa for torque transmission stuck object may be impossible even in vertical wells, for example, in the case of its application to flexible working towers" - slick wire, cable rope or flexible pipes of small diameters.

The aim of the invention is to enhance the functionality and effectiveness of hydraulic Yassa.

This objective is achieved in that the connection housing and the spindle is made in the form of a coil pair of the right direction with the angle of elevation, providing its nisamotors mobility and the opportunity to purchase working column angular and axial acceleration followed by the application of torsional and axial impact, and if necessary, applying a torsional shock in the opposite direction of the screw pair is made with a reverse thread.

On the issue of "inventive step" offer t is khnichenkova decisions can report the following.

The claimed technical solution achieves essentially new result, which is not present in known devices - allows you to initiate torsional shock. In our opinion, the simultaneous (combined) effect on release the object torsional and axial shock, which allows the proposed Iasi, should also be classified as significant results, because there is reason to believe that such attacks will allow the top to the bottom tightly covered thread and release some tacks, especially in horizontal sections of the wells.

On the other hand, it should be noted that the implementation of slot pairs in the form of a screw pair with the angle of elevation, providing its nasmotrevshayasya mobility, gives the claimed technical solution new properties that are not inherent in the known analogues, and it allows you to provide torsional effects on the fishing object through working column" with almost zero torsional stiffness, i.e. using the facilities of the cable-in cable technology, or through the columns of the flexible pipes of small diameter. This feature of the proposed device, in our opinion, can also be classified as significant.

Thus, in our opinion, the distinguishing features of the proposed technical solutions give him new the technical properties - to enhance the functionality and effectiveness of hydraulic Yassa. However, in the sources available to us we have not found any information about Iasi, by design, similar to those suggested. For these reasons, in our view, the proposed solution can be considered as the relevant criterion of "inventive step".

The drawing shows the proposed hydraulic Iasi performed for applying torsional-axial shock, aimed downward, longitudinal section. Mutual arrangement of the parts of the device corresponds to the moment before the beginning of the torsional-axial shock.

Iasi is installed between the production casing 1, provided with a weighted bottom (UBT), and release the object 2. The device consists of a body 3 and the spindle 4, which interact via a screw pair with 5 angle, providing nasmotrevshayasya mobility spindle 4 relative to the housing 3. On the other hand, the spindle 4 by means of the shaft 6 is rigidly connected with the piston 7, which is installed with the possibility of axial movement in the cylinder 8, is made in the housing 3 of the device. In turn, the spindle 6 at the ends of the cylinder 8 is sealed with a seal 9, resulting in the cylinder 8 are formed two closed cavity "b" and "h", filled with liquid (oil), and the cavity "b" formed dispersed in the th interval of the cylinder 8. The piston 7 is made non-return valve 10, the casing 3 is made the butt 11, interacting with torsional-axial impact with the shoulder 12 of the spindle 4.

Work Yassa is as follows.

When the rotation of the working of the column 1 relative to the stationary spindle 4, connected to the stuck object 2 is screwing spindle 4 into the housing 3 by a screw pair 5. As a result, the piston 7 begins to move relative to the cylinder 8, compressing the fluid in the cavity "b" above the piston 7. The resulting differential pressure on the piston 7 creates resistance to the specified process screwing the spindle 4 into the housing 3, so in a production string of pipe 1 accumulates elastic energy of torsion. After the piston 7 of the bore interval of cylinder 8 (cavity "b") gap between them increases and the resistance of the liquid axial movement of the piston 7 is sharply reduced, so that the spindle 4 and case 3 have the possibility of free rotation relative to each other by a screw pair 5. As a result, the mass of the lower side of the column 1 under the action of the accumulated elastic energy of torsion becomes angular, and hence the axial acceleration on the remaining length of the screw 5. After the stop face 11 of the case 3 on the collar 12 of the spindle 4, the movement of the screw pair 5 is stopped, and therefore there are torsional and axial blows the Ratio of the energies of axial and torsional components of the shock depends on the angle of the lifting screw 5, which is a particular design of the device based on the requirements of commercial practice. It is obvious that they are approximately equal when the angle of the lifting screw 45°and at smaller angles torsional energy of impact is greater than the axial. For the application of re-strike the main column tube 1 starts to rotate in the opposite direction, in this case 3 Yassa rises and again occupies the position shown in the drawing. This liquid located in the cavity "h" cylinder 8, flows into the cavity "b", through the check valve 10 to the process repeats.

Obviously, if necessary, applying a torsional shock in the opposite direction of the screw pair 5 must be completed with a reverse thread. On the other hand, it is obvious that by analogy with the known hydraulic jars, proposed Iasi easy to perform to perform blows upward, in combination torsional shock left or right direction.

However, the execution of the screw 5 with elevation, providing nasmotrevshayasya mobility spindle 4 relative to the housing 5, allows you to apply Yass not only hard working string of pipe 1, which is designed to transmit torque, but also on flexible working towers", for example, the scraper wire, cable rope, and flexible pipes of small diameter the TRS. It is obvious that such workers columns must be in the bottom part concentrated mass, for example in the case of descent on the wire gronostay. When the device is actuated reciprocating movements. Indeed, in this case, the result nasmotrevshayasya the execution of the screw 5, the axial displacement of a point mass in the lower part of these flexible working columns will be converted into rotational, and the latter will just curl up and unwind on those few turns, which is sufficient for operation of the proposed Yassa. It is obvious that the force of the torsional-axial shock when this will be determined by the inertia of the heavy bottom, i.e. the value of its localized mass on the device.

According to the authors of the applicants, the proposed device can be used in the practice of well workover, especially in emergency response in the horizontal sections of the wells, where the transmission of torque from the surface is difficult or impossible.

LITERATURE

1. Gcamp. Fishing in oil-wells. TRANS. from English. M.: Nedra, 1990. p.33-34.

Hydraulic Iasi, containing associated with the working column and release the object body and stem, interconnected and forming a pair of cylinder-piston" p the maturity, liquid filled with the education part of the cavity in the bore interval of the cylinder, characterized in that the connection housing and the spindle is made in the form of a screw pair with the angle of elevation, providing its nisamotors mobility, and with the opportunity to purchase working column angular and axial acceleration followed by the application of torsional and axial impact, and if necessary, applying a torsional shock in the opposite direction of the screw pair is made with a reverse thread.



 

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