RU86226U1 - DOUBLE Ejector Column - Google Patents

Abstract

Double ejector core projectile containing an adapter, a single ejector projectile located inside the outer pipe, including a conical nozzle, a diffuser, a saddle for a reset valve, an internal core collection pipe, a slurry pipe, as well as a podcortnik and rock-cutting tools, characterized in that, in order to increase the reliability of the capture and retention of the core, it is equipped with a core gripping element triggered by the axial movement of a single ejector projectile with a core receiver downward relative to the outer pipe when cutting the locking pin.

Description

The proposed utility model relates to mining and is intended for use in rotary core drilling of exploration wells with coring.

Known core ejector for A. with. USSR No. 1314006, class Е21В 21/00, containing a hydraulic hammer, an ejector with a central channel, an intermediate adapter, a core and slurry pipe, and a rock cutting tool.

This projectile, due to design features, provides high-quality cleaning of the bottom of the sludge, which leads to an increase in operating speed and the amount of penetration per flight. However, the design of the projectile does not allow to reliably capture and hold the core, since it is jammed, like most similar shells, due to the settling of small particles of rock and sludge in the annular gap between the core and the core pipe after turning off the washing pump and stopping the rotation of the projectile, which is a very unreliable method and often leads to partial or complete core loss.

Also known is an ejector core projectile by a.s. USSR No. 1470932, class Е21В 21/00, which includes an ejector in the form of a conical nozzle and a diffuser, an adapter with a system of channels for forward and reverse flows, a flow switch consisting of a seat and a relief valve and a core pipe.

This projectile allows you to switch from reverse to direct circulation of flushing fluid, thereby providing a more effective cleaning of the bottom of the well from the drilled rock, which ultimately should lead to an increase in the length of the run and an increase in the mechanical drilling speed.

However, this projectile, like the previous one, does not allow to reliably hold the core, since it is also jammed due to the sedimentation of rock particles and sludge between the core and the core pipe when the circulation of the flushing fluid is stopped and the rotation of the projectile is stopped.

The aim of the proposed technical solution is to increase the reliability of capture and retention of the core.

This goal is achieved in that a double ejector core projectile containing an adapter, a single ejector projectile located inside the outer pipe, including a sleeve, a nozzle, a conical nozzle, a diffuser, a saddle for a reset valve, an internal core receiving pipe, a slurry pipe, a podconal, an inner and an outer drill bits are equipped with a core gripping element installed in the lower part of the projectile above the conical part of the podkoronnik connected through a single core ejection core pipe molecular projectile generally axially moving the latter relative to the outer tube at cutting down the locking pin.

The proposed double ejector core projectile (longitudinal section shown in FIG. 1) includes a single ejector projectile consisting of a sleeve 1, a pipe 2, a conical nozzle 3 with a socket 4 for a resettable ball valve (not shown), a diffuser 5, mixing chamber A, distributor 6 with channels for the passage of the ejected (return) B and mixed B flows of washing liquid, slurry pipe 7, inlet valve 8, nipple 9, core core pipe 10, core holder 11, as well as podkoronnik 12, internal drill bit 13 , an adapter 14, a cut-off fixing pin 15, an outer pipe 16 and an outer drill bit 17.

Parts 1–6 form an ejector jet pump, and parts 7–9 form a sludge collector.

The shell works as follows. On the drill pipe string, the projectile is lowered into the well and drilled. In this case, the ball-reset valve is located outside the projectile. A single ejector projectile, including the details of positions 1 to 11, is suspended on a cut-off fixing pin 15 to the adapter 14.

During drilling, the flow of flushing fluid enters the projectile through the string of drill pipes. When moving at high speed through the jet pump, the pressure in the mixing chamber A decreases compared to the pressure in the well. As a result of the pressure differential, backwash of the flushing fluid occurs in the core tube. The work of all ejector shells is built on this principle.

With the jet pump, the washing liquid along with the sludge is sucked from the column pipe 10 through the inlet valve 8 into the sludge pipe 7, inside which the sludge is deposited, and the washing liquid flows through the channel B of the distributor 6 into the mixing chamber A, in which the reverse flow is mixed with the flow, flowing from the nozzle 3, enters the diffuser 5. Then, through the hole B of the distributor 6, the mixed stream flows from the jet pump into the annular space between the outer pipe 16 and the inner core pipe 10 and goes to the bottom wells. In the bottom-hole zone, a separation of the fluid flow occurs. One part of it, washing the inner crown 13, is ejected into the core core receiving pipe 10, and the other is washing the outer crown 17, enters the annulus between the outer pipe 16 and the walls of the well, and comes to the surface with the cuttings.

Reverse circulation provides high-quality cleaning of the bottom from sludge, prevents the occurrence of premature self-jamming and abrasion of the core, helps to increase the mechanical speed and the amount of penetration per flight.

After drilling into the drill pipe, the ball valve is reset, which sits in the socket 4 of the nozzle 3, blocking the channel for the passage of flushing fluid. The mud pump turns on. Under the pressure of the flushing fluid, the pin 15 is cut off and the entire single ejector shell, including the sleeve 1, the nozzle 2, the conical nozzle 3, the diffuser 5, the distributor 6, the slurry pipe 7, the inlet valve 8, the nipple 9, the core pipe 10, the core holder 11, is forcibly moved way down. In this case, the petals of the core holder 11, interacting with the conical surface of the subfennel 12, are deformed, compressed to the center and tightly wrap around the core, keeping it from falling out when lifting the projectile from the well.

Claims (1)

Double ejector core projectile containing an adapter, a single ejector projectile located inside the outer pipe, including a conical nozzle, a diffuser, a saddle for a reset valve, an internal core receiving pipe, a slurry pipe, as well as a podcortnik and rock cutting tools, characterized in that, in order to increase the reliability of the capture and retention of the core, it is equipped with a core gripping element triggered by the axial movement of a single ejector projectile with a core receiver downward relative to the outer pipe when cutting the locking pin.