SU1242603A1 - Versions of of case for probing part of deep-well induction instrumnt - Google Patents

Abstract

1. The casing of the PROBE part of the downhole induction device, containing a series of hollow ceramic cylinders arranged end-to-end, two adapters arranged end-to-end at both ends of a row of ceramic cylinders, an outer plastic cylinder made of a fibrous filler and a binder, characterized in , in order to improve the bending strength of the casing, it is provided with clamps, made in the form of pins, which are located in blind holes on the outer surfaces of the ends of the adapters, while prestressing The fiber fibrous filler is placed along the axis of the casing and secured with retainers. 2. The casing of the PROBE part of the borehole induction device, containing a series of hollow ceramic cylinders arranged end-to-end, two adapters installed end-to-end at both ends of a row of ceramic cylinders, an outer plastic cylinder made of a fibrous filler and a binder that distinguishes the fact that, in order to increase the bending strength of the casing, annular grooves are made on the outer surfaces of the ends of the adapters, while the pre-stressed fiber filler is placed at an acute angle to the noy axis of the housing. c ((L yu 41 1h9 Od O 00

Description

And 12

The invention relates to geophysical well studies and can be used in downhole devices for induction, high-frequency electromagnetic and magnetic logging, the design of which includes a high-strength radio-protective sealed protective casing.

The purpose of the invention is to increase the bending strength of the casing, i

FIG. 1 shows the cover, the first

varia t performance; In FIG. 2 is the same second embodiment.

The casing contains a series of hollow ceramic cylinders 1. The cylinders are butt-mounted and tightly fitted to each other. Two metal adapters 2 are located end-to-end at both ends of a row of ceramic cylinders 1 and are tightly fitted to them. The outer plastic cylinder 3 fits tightly the inner ceramic cylinders 1 and the ends A of the adapters 2,

The outer plastic cylinder 3 is formed by laying the strands 5 of the fibrous filler on the outer surface of the ceramic cylinders 1 and the ends 4 of the adapters 2. Around 5 are impregnated with a binder and laid along the surface of the cylinder row by row layer by layer.

In the first embodiment (Fig. 1), the fibrous filler strand 5 is secured on one adapter 2 by a clamp 6, laid along the casing, tensioned and fixed by a clamp 6 on the second adapter 2. and so on until the outer plastic cylinder 3 is formed,

In the second embodiment (Fig. 2), the strand of the fibrous filler 5 is fixed in the annular groove 7 on one adapter 2, laid along the casing along a helical line with a small (less than 60 angle, i.e. almost along the casing, tensioned and fixed on the second adapter 2, looping the adapter body in the annular groove 7, and so on until the outer plastic cylinder 3 is formed,

The proposed device works in the following way.

The probe of the device is placed in the internal cavity of the housing. With the help of adapters 2, the housing is hermetically connected to the mixing nodes of the instrument. The useful length of the casing is equal to the length

a number of ceramic cylinders 1, since only through this part of the casing electromagnetic signals are passed from the sensors to the formation, crossed by the well shsh from the formation to the sensor of the device. The useful internal diameter of the casing is equal to the internal bore diameter of the hole in adapter 2-, which is equal to or slightly smaller than the internal diameter of ceramic cylinders i and determines the maximum diameter of the probe that can be placed in the casing. When the device is lowered into the well, the hydrostatic pressure of the drilling fluid, body impacts on the borehole walls and high temperatures affect the probe housing. Due to the inner cylinders 1 of high strength ceramics, the casing withstands high hydrostatic pressures of the drilling fluid, while inside the casing the probe is in air at normal pressure. The outer plastic cylinder 3 fits tightly against the inner ceramic cylinders I and the ends 4 of the adapters 2 attached to the ceramic cylinders 1. The outer plastic cylinder 3 holds the ceramic cylinders 1 together.

and adapters 2 into a single solid

pipe, provides sealing of the casing and protects the ceramic cylinders 1 from impacts. When transporting the device and preparing it for operation, the housing experiences bending loads. These loads are perceived and maintained by the external plastics cylinder 3, the longer the device and the smaller its outer diameter, the

more bending loads.

The introduction of clamps on the transition-. The nicknames will allow orienting the fibrous filler of the outer plastic cylinder during its formation along the casing and fixing it directly to the adapters in the prestressed state. It increases strength

external plastic cylinder for bending, which will make it possible to extend the radio-transparent part of the casing without increasing: its outer diameter, which in turn will increase the information content of the device and preserve its explosive quality.

Phi2. one

FIG. 2

Editor N. Dankulich

Compiled by I.Karbachinska Techred M. Hodankchakorustor E.Roshko

Order 3673/30 Circulation 548

VNIIPI USSR State Committee on Inventions and Discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Production and printing company, Uzhgorod, st. Project, 4

Subscription

Claims (2)

1. The casing of the probe part of the downhole induction device, comprising a series of hollow ceramic cylinders located end-to-end, two adapters located end-to-end on both ends of a series of ceramic cylinders, an outer plastic cylinder made of fiber filler and a binder, characterized in that, for the purpose of increasing bending strength of the casing, it is equipped with clamps made in the form of pins that are located in blind holes on the outer surfaces of the ends of the adapters, while the laminar filler is placed along the axis of the casing and secured with retainers. 2. The casing of the probe part of the downhole induction device, comprising a series of hollow ceramic cylinders located end-to-end, two adapters mounted end-to-end at both ends of a series of ceramic cylinders, an outer plastic cylinder made of fiber filler and a binder, characterized in that, in order to increase bending strength of the casing, annular grooves are made on the outer surfaces of the ends of the adapters, while the prestressed fibrous filler is placed at an acute angle to the longitudinal axis housing.