SU1500757A1 - Core-drilling tool - Google Patents

Description

The invention relates to mining and is intended to create a reverse bottom-hole circulation of flushing fluid during drilling. The goal is to improve the quality of testing. The projectile contains a core pipe 4, a submersible piston pump 'with a piston 2 having a hydraulic drive in the form of a striker 3, and a housing 1. The latter is connected to the core

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pipe 4 and has a working chamber 5 connected by a channel 6 with the exhaust valve 7. with external space. Chamber 5 is connected by channel 8 to the inlet valve 9 with the cavity of pipe 4, valve 9 has a servo drive, made in the form of an additional chamber 14 with a piston bushing 12. It is connected to valve 9 and has throttling holes 13. The pump is made over the piston cavity 18, the chamber 14 in the area under the sleeve 12

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communicated with the cavity 18, and in the area above the sleeve 12th external space. At the beginning of the discharge phase, the inertia of the valve 9 is quickly overcome and the channel 8 is blocked. Thus, the flow of fluid from the working chamber 5 into the cavity 4 and the pulsation of fluid pressure over the core are eliminated. After closing the channel 8, the liquid from chamber 5 is forced out through the channel 6 with the valve 7 into the external space. 1 il.

The invention relates to mining, in particular, to means for creating a reverse bottomhole circulation of drilling fluid during drilling of wells with coring.

The purpose of the invention is to improve the quality of testing. 25

The drawing shows the device, a general view;

Kolonkovy projectile consists of ^: loaded piston pump with housing-1; catfish 1 and a hydraulic drive port-30 nya 2, made in the form of striker 3.

The housing 1 of the piston pump is connected ^; with core pipe 4 and has a working chamber 5, which is connected by a channel 6 with an exhaust valve 7 with external space and a channel 8 with an inlet valve 9 s. a hollow core pipe 4. The inlet valve 9 is spring-loaded with a spring 10 and is rigidly connected with a piston bushing 12 having dd throttling holes 13. The servo drive is designed as a piston bushing 12 installed in an additional chamber 14. The latter is made in the housing 1 of a piston pump, 45 insulated from the working chamber 5: 1 5. The chamber 14 in the area above the sleeve 12 is connected by a channel 16 with the external space, and in the area under the sleeve 12 - by a channel 17 with a piston casing 18, which is formed in the pump and formed by the seal 19, the piston cm 2, the housing 1 and the striker 3.

Kolinsky projectile works hardly- $$ blowing manner.

In the process of drilling, the firing pin 3 together with the piston 2 makes reciprocating movements in the working chamber 5 of the housing 1 of the submersible piston driven pump. When the piston 2 moves upward, the fluid from the overpiston cavity 18 is injected through the channel 17 into the additional chamber 14 and further, throttling through the holes 13 of the piston sleeve 12, flows through the channel 16 into the outer space. Throttling of fluid through opening 13 leads to the appearance between the upper and lower surfaces of the sleeve 12, the pressure drop and consequently the upwardly directed force which is transmitted through the rod 11 on the inlet valve 9 by neutralizing the force of the spring 10. In this case seal 15 rules out an immediate impact _ί pressure from the additional chamber 14 to the inlet valve 9. As a result, the inlet valve 9, together with the plunger 11 and the sleeve 12, moves upwards, opening the channel 8.

At the same time, when the piston 2 moves up in the working chamber 5, a vacuum is created, under the action of which the exhaust valve 7 closes the channel 6, and the liquid from the cavity of the core pipe 4 enters the working chamber 5 through the open channel 8.

Thus, it is achieved by agreeing on the movement of the intake valve 9 with the movement of the piston 2 during the suction phase, which increases the filling of the working chamber 5 with liquid and the intensity of the backwash.

[and also eliminates pressure losses in the circulating well system associated with the need

opening the intake valve 9 with a rising flow of flushing fluid,

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When the piston 2 moves downward on the sleeve 12, a pressure drop arises from the throttling of the fluid through the holes 13 again. However, in this case the fluid flow is directed from the external space with the hydrostatic pressure of the well into the filled space of the piston 18. And therefore the gain on the sleeve 12 coincides with the downward force of the compressed spring 10. As a result, at the beginning of the discharge phase, the inertia of the intake valve 9 is quickly overcome and the channel 8 is blocked, thus eliminating the flow of fluid from whose chamber 5 into the cavity of the column tube 4 and the pulsation of fluid pressure over the core, worsening the conditions of core formation ..

After closing of the channel 8, the liquid. From the working chamber 5 is squeezed out through the channel 6 with the exhaust valve .7 into the external space.

Claims (1)

Formula of the Investigation Column projectile containing a kolonkovuyu tube, submersible piston pump with a piston, having a hydraulic drive in the form of a striker, and with a corpus ¹ , connected to the core tube and having a working chamber, connected by a channel with the discharge valve Ιθ with external space, and a channel with an inlet valve with a hollow core pipe, distinguished by the fact that, in order to improve the quality of testing, it is equipped with a ser15 inlet valve, made in the form of an additional chamber with a piston bushing connected to the valve and having throttled holes, and the pump is made with nadporsh- | 20 neva cavity, with the additional camera in the area under the piston bushing communicated with the over-piston cavity of the pump, and in the area with the piston bushing with the external simple 25 wounds.