RU2433263C1 - Method and device for stabilisation of electron board of accelerometers in instrument case of downhole telemetering system - Google Patents

Abstract

FIELD: oil and gas production. ^ SUBSTANCE: invention can be applied in a technology of stabilisation of electron metering components in an instrument case of a downhole telemetering system (DTS). According to a method, at first there is manufactured a small-sized holder on high-precision small-sized machine tools with controlled fabrication of orthogonal planes of equal areas, then electron boards of accelerometers are mounted on these planes of the demountable orthogonal-plane holder. The holder is small-sized with precise orientation of the orthogonal planes. Thus electron boards are precisely oriented on these planes and easily mounted. The holder is pressed to the plane and screwed to a wall of the instrument case. The holes in the demountable orthogonal-plane holder and in the wall of the instrument case are precisely mutually oriented, and screw adjustment in these holes does not disturb arrangement of the electron boards. This ensures precise mounting of the electron boards on a separate carriage that finally improves measurement reliability while the instrument being in service. ^ EFFECT: simplified technology of sabilisation of the electron boards of the accelerometers to the instrument case of the DTS and higher measurement accuracy of the instruments. ^ 2 cl, 2 dwg

Description

The invention relates to the field of drilling oil and gas wells, to means of spatial control of the position of the wellbore, specifically to the technology of fastening electronic components of measuring devices in the body of the measuring device of the downhole telemetry system (ZTS).

Known RF patent No. 2371574 "Electronic borehole device of the telemetry system" (publ. 10/27/2009), in which the electronic components of the measuring device are attached to the chassis in the form of a cylinder with milling along its axis from two sides, inserted into the body of the device.

A disadvantage of the known device is that the chassis is not intended for mounting electronic boards of accelerometers. Accelerometers should be located on three orthogonal planes that run in the chassis.

Known measuring navigation system "KURS" (A.Yu. Ropyanoy, V.Z.Skoblo (ZAO "NT-KURS") www: ntkurs.ru. Publications.), In which the mounting of accelerometers - instruments for measuring the zenith angle, is carried out directly on three orthogonal planes inside the grooves made on the body of the face block.

A disadvantage of the known measuring complex is that when implementing the technology of making grooves in the ZTS housing, it is difficult to achieve equal areas and accurate axial orientation of the orthogonal planes of the grooves, onto which boards with electronics or accelerometers themselves are then glued. Failure to comply with these conditions further affects the accuracy of the measurement of devices.

A well-known electronic unit of a downhole device of a telemetry system containing boards with accelerometers and a magnetometer designed to measure the zenith angle and direction of the magnetic field, which are mounted on an additional chassis located inside a window made inside the main chassis, then installed inside the device’s security enclosure (US Pat. No. 2318118, pr. September 13, 2006, published on February 27, 2008). (Selected as a prototype of the claimed method and device.)

The installation method of the accelerometers according to patent No. 2318118 comprises the operation of placing electronic boards on the orthogonal planes of the additional chassis, installing an additional chassis inside the window, which is carried out in the main chassis, which is then placed in the protective housing of the ZTS device.

The disadvantage of this method lies in the complexity of the assembly technology of the device and the inability to establish the exact axial orientation of the orthogonal planes on the additional chassis, since it is installed in the window of the main chassis, which, in turn, is located in the protective case of the device, which ultimately affects the accuracy of measurements of accelerometers .

The objective of the invention is to simplify the technology of mounting electronic boards of accelerometers to the body of the measuring device ZTS and improving the accuracy of measuring devices.

This problem is solved by the fact that in the method of mounting the electronic boards of the accelerometers in the housing of the ZTS measuring device, which includes placing the electronic boards of the accelerometers on a separate chassis and installing them in the housing of the measuring device, it is possible to manufacture a separate chassis in the form of a small removable orthogonal-plane holder (holder), on which orthogonally located planes having the same area are preliminarily performed, and a notch is made in the housing of the measuring device ZTS, in which then install the specified holder. The holder is fixed in the recesses with screws.

The inventive method is carried out using a device for mounting electronic boards of accelerometers in the recess of the housing of the measuring device ZTS, which is a separate chassis made in the form of a separate small removable orthogonal-plane holder containing orthogonally located planes having the same area for mounting accelerometers, and in which surface mating with the wall of the recess of the housing of the measuring device ZTS, made holes for mounting screws, and in the housing zhatelya - bore to accommodate the conductors connecting electronic circuits accelerometers to the electronic circuit ZTS meter, whose body is made with a groove to accommodate transit wire connection between the electronic circuit of the measuring instrument and its PTE recording device.

Figure 1 shows the orthogonal-plane holder.

Figure 2 is a view of the housing of the measuring device in which the holder is placed.

A separate small-sized removable orthogonal-plane holder 1 (Fig. 1) is designed to accommodate electronic boards 5 of the accelerometer of the measuring device on planes 2, 3 and 4, oriented perpendicular to each other and having the same area. On the planes 2, 3 and 4 there are electronic boards of the accelerometers 5, from which conductors 7 are laid in the grooves 6 of the holder 1, connected to the electronic circuit 13 of the measuring device 8. The holder 1 is mounted in a small recess 9 of the body of the measuring device 8 using screws 10 located in the holes on the plane 11. In the housing of the measuring device, a groove 12 is made for the placement of transit wires of communication between the electronic circuit 13 of the measuring device ZTS and its recording device (not shown in FIG. 2).

According to the claimed method, a small-sized holder is first manufactured on high-precision small-sized machines with the ability to control the execution of orthogonal planes of the same area, then on these planes 2, 3 and 4 of a small removable orthogonal-plane holder 1, electronic boards 5 of accelerometers are installed (Fig. 1). Since the holder is small-sized with the exact orientation of the orthogonal planes, the electronic boards are precisely oriented on these planes and are easy to install. Then the holder 1 is pressed against the plane 11 and, with the help of screws 10, are screwed to the wall of the housing of the measuring device 8. The holes in the removable orthogonal-flat holder 1 and in the wall of the housing of the measuring device are precisely oriented relative to each other, and when installing the screws 10 in these holes, the location of the electronic circuit board is not broken. Thus, the accuracy of installing electronic circuit boards on a separate chassis is achieved, which ultimately increases the reliability of the measurement during operation of the measuring device.

The modern base of electronic chips allows the use of miniature electronic boards of accelerometers that can be installed on small areas of a removable orthogonal-plane holder, the size of which is reduced, which allows it to be installed in a shallow recess in the body of the measuring device, which greatly simplifies the manufacture and assembly of cases. Moreover, this recess does not need to be accurately oriented in orthogonal directions, since this orientation is carried out with high accuracy in the manufacture of a small-sized removable orthogonal-plane holder.

Claims (2)

1. The method of mounting the electronic boards of the accelerometers in the body of the measuring device downhole telemetry system (ZTS), including the installation of electronic boards on a separate chassis and placement in the body of the measuring device ZTS, characterized in that the separate chassis is made in the form of a small removable orthogonal-plane holder, in which previously carry out orthogonally located planes with the same area, and place on these planes electronic boards of accelerometers, then holding said spruce mounted in a recess of the measuring device housing. 2. Device for mounting electronic boards of accelerometers in the housing of the ZTS measuring device, which is a separate chassis, to which electronic boards of accelerometers are attached, characterized in that the separate chassis is made in the form of a small removable orthogonal-plane holder (holder) containing orthogonally located planes with the same area for mounting accelerometers installed in the recess of the housing of the measuring instrument ZTS, and in which on the surface mating with the wall recesses in the housing of the ZTS measuring device, holes for mounting screws are made, and in the holder’s case there are grooves for placing conductors connecting the electronic boards of the accelerometers to the electronic circuit of the ZTS measuring device, the housing of which is made with a groove for placing the transit wires of communication between the electronic circuit of the ZTS measuring device its recording device.

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