Downhole vibrator for emergency operations in wells

 

(57) Abstract:

The invention relates to the field of drilling and operation of wells, namely submersible vibratory mechanisms. To improve reliability by saving efforts torque and to ensure full warranty from the relaxation of any threaded connections in the lower portion telescopically mounted in the body of the rod set piston, the seal placed on the outer surface of the piston, and the outer surface in the form of a polyhedron made along the length of the rod. 2 Il.

The invention relates to the field of drilling and operation of wells, namely submersible vibratory mechanisms.

Known submersible hydraulic vibrator with dvuhklapannaja distribution system fluid, comprising a housing with anvils and hammer (Kolomoets A. C. Winds A. K. Modern methods of prevention and liquidation of accidents in exploration drilling. M "Nedra", 1977, S. 140-142). The lack of hydrovibrator that with the deployed column pipes hydrovibrator has a hard link. As a result, the efficiency of hydrovibrator negligible because the frequency range of the vibrations of the column of pipes on an order of magnitude smaller range castolite special trubber for unscrewing pipe (overview series "Drilling" "Eliminating sticking of the drill string using percussion mechanisms, Issue 18, M, 1982, S. 47-49). When trubber no efforts torque that adversely affects the performance of threaded connections located below the subs, i.e., they'm quite unhinged by it.

The invention consists in that the downhole hydrovibrator for emergency operations in wells containing hollow body in the upper part of which is made a hole in the form of a polyhedron, telescopically located in the housing, the rod having an outer surface in the form of a polyhedron under the housing bore associated with the rod coupling for connection with the column pipe, a seal for sealing the stem relative to the housing and placed in the body cavity of the head with an anvil in the lower part of the rod set piston, the seal placed on the outer surface of the piston, and the outer surface in the form of a polyhedron made along the length of the stem.

The claimed combination of features allows you to provide hydrovibrator in a resonant mode and the shift stuck pipe due to the separation of the tubing on the oscillating and stationary parts while maintaining efforts torque IOM is lstvennyh (the oscillation frequency of stuck pipe vibrations of maximum amplitude and the greatest effect when stuck.

Depending on the supply of washing fluid, the working frequency of the vibrator is in the range from 30 to 100 Hz, allowing it to be placed as close as possible to the interval sticking, i.e. in the most effective place.

Thus, in the proposed hydrovibrator is the separation of the tubing on the oscillating and stationary parts, but completely preserved efforts of torque that provides a full guarantee from the relaxation of any threaded connections.

To conduct fishing operations rotation of the hydrovibrator is transferred from the pipe string through a multifaceted rod on the housing with the corresponding cross section in the upper part of hydrovibrator where possible axial movement of the rod. Hydrovibrator works at a certain pressure drop, and therefore, the sealing of the piston is ensured by the sealing body and stem hydrovibrator.

In Fig. 1 shows a downhole hydrovibrator for emergency operations in wells, Fig.2 cut the top of the hydrovibrator along a-A.

Downhole hydrovibrator includes a housing 1, with the anvil 2 and the striker 3. In the upper part of hydrovibrator posted with the possibility telescopic AC is estco connects the column pipe. The rod 4 with the sealing piston 5 are axial flushing channel 8. To transfer torque from the drill string to hydrovibrator the bore of the housing 1, which may move the rod 4 and the piston rod 4 is made in the form of a polyhedron, for example, square (Fig. 2).

Downhole hydrovibrator for emergency operations in the wells is as follows.

When the shutter hydrovibrator in the borehole and the successful completion of fishing operations set the string of pipe in such a position that the rod 4 with the sealing piston 5 inserted in the case 1 hydrovibrator the entire length of rod stroke. Then submit the flushing fluid through the axial channel 8 gets into the hydraulic part of the vibrator and provides shock striker 3 2 anvils, creating a vibration.

The contact surface of the sealing piston 5 with the sealing rings 6 and the housing 1 provides a seal when the hydrovibrator. Waves generated by hydrovibrator, transmitted through the fishing tool attached to the pipes. The upper part of the housing 1 hydrovibrator will make oscillatory movement relative to the rod 4 and the sealing of the piston 5. T. O. descent vehicle what is used on a column of Tr is, ostiguy such frequency fluctuations hydrovibrator, which corresponds to the estimated natural frequency of stuck pipe. Due to the fact that in the lower part of the rod has a piston seal, and the outer surface in the form of a polyhedron made along the length of the rod, are saved the effort of torque. Therefore, there is no relaxation of any threaded connections located below the subs hydrovibrator that allows to perform an operation on potenciano them by rotating the drill string when the axial load, which can lead to separation on the left thread.

When vibration in the area of the resonance stuck pipe under the action of gravity gradually moved down the entire length of stroke of the rod 4. After there has been a shift stuck pipe, start rasagiline column of pipes and eliminate sticking.

Design hydrovibrator simple, convenient and reliable in operation. In addition, when the hydrovibrator it creates vibrations are not transmitted to the string of pipe above it, which increases the durability as wellhead equipment, and most of the pipes.

Downhole hydrovibrator for emergency operations in wells, the content is defined in the housing stock, having an outer surface in the form of a polyhedron under the housing bore associated with the rod coupling for connection with the column pipe, a seal for sealing the stem relative to the housing and placed in the body cavity of the hammer with the anvil, characterized in that the lower part of the rod set piston, the seal placed on the outer surface of the piston, and the outer surface in the form of a polyhedron made along the length of the rod.

 

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