A well drilling assembly of the type in which a rotary device is attached to a drawworks, for example to the hoisting hook on a derrick, to which rotary device a hollow shaft (13) is coupled, having a threaded end which is adapted for connection to a complementary threaded end on the drill string, and wherein a clamping/lifting means known as an elevator (38) is suspended below the rotary device by two hanger struts (37). The shaft (13) connected to the rotary device is telescopic. Outside the shaft a lifting means (24, 25, 40) is provided for the lower part (21) of the telescopic shaft. The two hanger struts (37) which carry the elevator (38) for one end of the pipe are axially movable in relation to the telescopic shaft (13) by means of a sliding holder (35) known as a link hanger. The link hanger (35) is axially movable by means of hydraulic cylinders (42,43).The lifting means for the lower part of the telescopic shaft consists of hydraulic cylinders .(24, 25) which are constructed as a unit together with the hydraulic cylinders (42, 43), the cylinders (24, 25) constituting piston rods for the hydraulic cylinders (42,43).

1. A single-spindle or multi-spindle deep boring machine having a tool change device characterised in that the device (7) is formed by cylindrically arranged receiving tubes (8), wherein along a part of the length of the receiving tubes (8) the cross-section thereof is removed over an angle of somewhat more than 180 degrees, in such a way that for the purposes of receiving a deep boring tool (3, 3') perpendicularly to the axis of the receiving tube (8), wherein the inside diameter thereof is substantially equal to the diameter of the deep boring tool (3, 3'), an open half-shell is formed, from which the deep boring tool can be pushed into the remaining part in the axial direction of the receiving tube (8).

1. A single-spindle or multi-spindle deep boring machine having a tool change device characterised in that the device (7) is formed by cylindrically arranged receiving tubes (8), wherein along a part of the length of the receiving tubes (8) the cross-section thereof is removed over an angle of somewhat more than 180 degrees, in such a way that for the purposes of receiving a deep boring tool (3, 3') perpendicularly to the axis of the receiving tube (8), wherein the inside diameter thereof is substantially equal to the diameter of the deep boring tool (3, 3'), an open half-shell is formed, from which the deep boring tool can be pushed into the remaining part in the axial direction of the receiving tube (8).

An extrusion apparatus having a barrel (3) and a rotatable threaded screw (1) coaxially positioned therein is disclosed. The apparatus includes an upstream inlet section having an opening (13) therein for receiving material to be processed by the apparatus, a compression section (2) downstream of the inlet section, and a mixing or plasticizing section (7/8) downstream of the compression section. The interior surface of the barrel is provided with an undercut (12) therein which intercommunicates the feed opening with the compression section and has a portion thereof which extends downstream in the compression section about the interior surface of the barrel with a continuously decreasing cross-sectional area. The undercut may be formed in a cylindrical insert (9), carried within the barrel and, in an alternate embodiment, a second undercut cylindrical insert positioned about the first insert and rotatable relative thereto may be employed to vary the cross-sectional area of the undercut.

A hydraulic striking device (1) includes a percussion piston (3) which reciprocates in an operating cylinder (2) and strikes a bit (4). The reciprocation is governed by a control valve (10) which is connected to the operating cylinder by a control conduit (27). A holding valve (30) in the control conduit has three connections (27a, 27b, 31): one with the control valve, one with the operating cylinder, and one with the return conduit (17). The connections (27a, 31) which are connected with the operating cylinder and with the control conduit are axially aligned and form the outlets of a hollow cavity (53) in which a preferably spherical movable valve body (54) is disposed, the cross-sectional area of the valve body being smaller than that of the cavity. The connection (27b) with the control valve opens radially into the cavity. If the valve body rests against the valve seat (55) which faces the return conduit, the axis of the connection (27b) passes through that half of the valve body which faces this valve seat. When the striking device operates, energy that is reflected from the bit to the percussion piston can be utilized for the following stroke and thus the total performance of the striking device is increased.

The tip (10) of a soil boring drill has at least two curved plates (12), extending radially outwards from the drill axis (14) with a decreasing axial height radially outwards. The plates have the same curvature radius, especially as segments of a cylindrical tube.

The invention concerns a device (1) for manipulating tools comprising two parts, said device being of the type consisting of a frame and at least one tray forming a table, designed to receive the mold. The invention is characterized in that it comprises two horizontally arranged trays (6, 9-7, 8) one of which is arranged sliding on the frame to be mobile in translation relative to the other tray, from a close position to a remote position and inversely, so as to enable the tool to be manually opened and closed.

SUMARY Comprises first and second pieces (10, 20) which have end configurations (11, 21) for installation and guide and respective coupling configurations (14, 24) plug-in fit at the ends of a third, tubular piece (30) which defines an intermediate, cylindrical section (31), for attachment of liners (40). The hydraulic device comprises two expansible sleeves (50) situated on the first and second pieces (10, 20) each with a circular cavity (51) connected to a longitudinal duct through the shaft containing a fluid capable of being subjected to pressure to make convex an external, deformable wall (52) of the sleeve. The longitudinal duct comprises first and second sections (12, 22) in the first and second pieces (10, 20) connected, by means of a flexible tube (60) located in the hollow interior of the third piece (30).

The device (1) comprises a base (2), carrying a servo motor (3) and attached to the frame of a machine center. A carriage (6) with a vertical shaft (8) on top can be moved on two telescopically arranged rails (4,5) joined horizontally to the base (2). The tool holding elements (16,17) are positioned at the upper end of the shaft (8) and can be fixed with a locking unit (18). A control plate (12) is located at the second rail (5) acting in combination with a guiding roll (10) in order to facilitate a swivel motion of the tool carrier (15).

A method of determining GOR comprising subjecting a fluid to spectroscopic analysis at a first wavelength sensitive to gas and a second wavelength sensitive to oil, determining a response matrix for the contribution of gas at the first and second wavelengths and the contribution of oil at the first and second wavelengths, determining a signal response vector and the two wavelengths, calculating a mass fraction vector from the response matrix and the signal response vector and using the mass fraction vector to determine GOR.