SU1634776A1 - Jet bottom catcher - Google Patents

Abstract

The invention relates to a drilling technique and is intended to remove large and small objects from the bottom of a well. The goal is to increase the efficiency of the catcher by increasing the volume of captured sludge while simultaneously increasing the rate of its capture. In the wall of the hollow body (K) 1 of the catcher, ejection nozzles 4 are located and radial channels (RK) 5 are made. In the upper part of the cavity K 1 there is a spring-loaded relative

Description

The invention relates to drilling equipment, in particular, to devices for removing large and small objects from the bottom of a well.

The purpose of the invention is to increase the efficiency of the trap by increasing the volume of sludge being caught while increasing the rate of its capture.

Fig 1 shows the proposed safety device in the initial position, the section, Fig 2 - the same in the working position

The ejection bottomhole catcher contains a hollow body 1 with an adapter 2, a milling crown 3 In the wall of the body 1 ejection nozzles 4 are located and radial channels 5 are made, hydraulically connected along the axis of the ejection nozzles 4 to eject the flow from the radial channels 5 The upper part of the cavity of the housing 1 is placed along the axial direction of the spool valve 6, depressed relative to the latter, with the upper row of radial channels 7 reporting in the initial position of the elasticity of the housing 1 above and below the spool valve a valve b and a lower row of radial channels 8 for communication in the working position of the housing cavity under the slide valve 6 with its radial channels 5 Under the slide valve 6 is located the receiver-like chambers 9 with slurry installed along its axis: ruby 10 having a nozzle 11 along the top The axes of the housing 1, between the slurry pipe 10 and the filter 12, have a nozzle 13 forming an additional slurry receiving chamber 14 with the walls of the housing 1. The nozzle 11 of the slurry 10 is located in the nozzle 13 and forms an annular parts of the cavity of the body 1 under the slurry pipe 10 are hingedly mounted self-closing latches-petals 16 The body has nozzles 4 located along the axis of the ejection nozzles 4, and the radial channels 5 are hydraulically connected

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with ejection nozzles 4 and nozzle - 2Q 17 of housing 1 for ejecting the flow of flushing fluid from the radial channels 5 of housing 1

The device works as follows

25 The safety device is lowered into the well on the drill pipe to the level of bottomhole sediment and the circulation of flushing fluid is switched on. The spring-loaded spool valve 6 is in its extreme upper position and the flushing fluid is through

3 ° upper row of radial channels 7, channel 18 filter 12, nozzle 13 and sludge pipe 10 goes to the bottom of the well and then into the pipe space, ensuring the cleaning of the objects on the bottom from the sediment. , thereby increasing the pressure drop over the spool valve 6, which moves down, the spring 19 and shut off the upper row of radial channels 7. At the same time, the lower

40 series of radial channels 8 is combined with radial channels 5 The flow of the washing liquid enters the ejection nozzles 4 and then through the nozzles 17, while in the cavity of the housing 1 a zone of reduced pressure and washing liquid are formed

45 together with sludge from the inlet enters the slurry receiving chambers 9 and 14. The largest objects are held by self-closing latches of lobes 16, smaller objects through the windows 20 in the slurry pipe 10 enter the slurry receiving chamber 9 chamber 14 Small objects that entered the sludge receiving chamber 9 through the annular gap 15 by creating

55 there are zones of reduced pressure, which are fed through the nozzle 13, also into the additional sludge receiving chamber 14, are reflected from the filter 12.

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In case of technological need as well as raising the catcher and well, reduce the flow rate of flushing fluid until the pressure drop on the slide valve 6 decreases and it does not take the initial position. Then, the forward circulation is restored and the rock is washed out.

The use of the proposed ejection catcher allows to reduce the time for cleaning the bottom hole from cuttings, reducing the number of additional flights

Claims (1)

Invention Formula An ejection bottomhole guard comprising a hollow body with radial channels and ejection nozzles located in its wall, placed in the upper part of the body cavity and a spool valve spring-loaded relative to it in the axial direction with an upper row of radial channels informing the cavity in the initial position above and below slide valve and lower p o m ra0 radial channels for communication in the working position of the housing cavity under the slide valve with radial channels of the housing; there is a slurry receiving chamber with a slurry pipe installed along its spool valve and a filter placed under its receiving chamber, characterized in that the catcher works by increasing the volume of the collected sludge with a simultaneous increase in the rate of its capture, it is equipped with a pipe installed along the body axis between the sludge pipe and the filter and forming m with the walls of the hull additional sludge reception 5 NY cameras, the sludge pipe in the upper part has a nozzle located in the nozzle and forming an annular gap with the walls of the latter, and the case has nozzles located along the ejection nozzles along the axis, and radial channels associated with ejection nozzles and nozzles of the casing for ejection of the flow from the radial channels of the housing in the working position of the device 0