SU1239664A1 - Well deformograph - Google Patents

Abstract

The invention relates to geophysical instrumentation and is specifically designed for measuring volumetric deformations of the earth's surface. Improving the measurement accuracy in this site is achieved by using a bellow-sealed calibration node, as well as a sealed photoelectric strain gauge. Additionally, the long-term stability of the device is improved. 1 il. u oo so o O) 4

Description

The invention relates to geophysical instrumentation and is intended to measure volumetric deformations of the earth's surface in order to search for precursors of earthquakes to study the internal structure of the Earth, to detect artificial disturbances of the earth's surface, determining the spatial position of oil and gas deposits,.

The drawing shows a diagram of defrosting.

The device consists of a sealed stainless steel housing 1 filled with a neutral fluid j of the strain sensor j which includes a metal bellows 2, a rod 3, a screen 5 with a hole 6, a LED. 7 and photocell 8, Bellows 2 upper-end tightly connected to the upper base A of the housing, and the lower end tightly to the lower end of the spring-loaded rod 3. The stem 3 is mounted along the axis of the bellows 2 and passed through a hole in the base 4. Screen 5 is rigidly connected with the upper end of the rod 3., the right-angled. hole 6 is made in the center of the screen 5, with one screen CTOpoHbj the LED 7 is installed in the center of the hole, on the other - a differential photocell 8 rigidly connected to the base 4,

The calibration device includes a metal bellows 9; with rod 10e micrometer screw

11 with displacement sensor 12 j. A reversible motor 13, Bellows 9 is hermetically connected by the upper end with a pin 4, and the lower end is tightly connected with the lower end of a spring-loaded stem 10c. The latter passes through the hole in the base 4 and its vertical end is connected to the x-micrometer screw 11, to the head of which the movement sensor 2 is rigidly fixed; (counter of fractions of the micrometer screw rotation), Rotation. micrometer screw 1 is provided with a reversing motor 13,

The calibration control unit 14 provides for the supply and execution of commands for the displacement of the micrometer screw 11 (the rod 10,

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bellows 9) for a precisely defined distance. Stand. - A recorder 15 is connected to the photocell circuit 8, which can be used as a register with a galvanometer recording system, a compensation self-recording potentiometer of the type KSP-4 or a digital F-30 voltmeter with digital printing device.

The base 4 is made in the form of a cup, hermetically connected to the corecoM 1 and hermetically closed by a lid 16. It is the main circuit board of the deformograph.

 The deformograph works as follows.

The deformograph is installed at the bottom of the pump in conditions that ensure the temperature of the environment around the medium with an accuracy of no less than 0.0001 C b day and exclude the effect of changes in atmospheric pressure marginally on the design of the deformograph. Its tight connection with the surrounding rock is ensured. The power of the light-dibbling and control panel of the calibration device is connected, the recorder is connected to the photocell circuit. By displacing the micrometer in the appropriate direction, the recorder indicator is displayed in the middle position of the scale in the zero position}, the deformation of the surrounding rock is transferred to the body of the deformograph rigidly attached to it, the body of the device is deformed, and this deformation is transmitted by means of liquid to the bellows of the deformation sensor.

Depending on the sign of the deformation, the bellows is compressed or expanded, thus displacing the brush with the screen of the strain sensor, rigidly connected with the bellows. The light flux changes from each component of the differential photocell, & therefore, the electrical signal in the photocell circuit is also changed. The recorder registers an electric signal variation curve proportional to the magnitude of the change in the deformation of the surrounding environment 5 (their Deformograph of rocks, Znagg of the formation is determined by the displacement of the micrometer and the associated bellows.

To calibrate the deformograph for the purpose of quantifying the volumetric deformations (defining the scale of the deformograph recording), the micrometer is given an exactly known displacement, and hence the displacement of the associated bellows. Let the bellows diameter be 10 mm, the micrometer screw pitch 0.5 mm, the counter of fractions of a micrometer provide a count every 18 ° turn of a micrometer.

Thus, the screw turn is equal to 20 dollars m.

Turning a micron by 1.8 corresponds to a displacement of the associated bellows by 0.025 ifi. The reference design of the internal circumference of the deformograph is equal to

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  1,96 mm / share.

Let the internal diameter of the body of the deformograph is 100 mm, the height of the defrrograph is 2000 mm, then the internal volume of the body of the demograph; , 7 and 7

Thus, turning the micrometer by 18 will change the initial internal volume of the de4) housing of the ormograph by 1.2 ± 10. The deformograph can be used not only to search for precursors of earthquakes, to register artificial disturbances of the earth's surface, but also to register tidal reformations of the earth's surface in order to study the internal structure of the earth and to determine the spatial position of the oil and gas reservoir.

To determine the scale of the record: the deformatograph of the micrometer is set to offset by дол fractions, while the indicator of the recorder is shifted to the tick marks. The recording scale is determined from the expression K. - mm / division, the proposed deformograph is distinguished by its distinct long-term stability and accuracy due to

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using a sealed calibration node and a photoelectric strain gauge.

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Claims (1)

Invention Formula Well deformograph, containing-. A deformation sensor, including a metal bellows, placed in a sealed metal case filled with neutral liquid, a calibration device consisting of a metal rod connected to a micrometer screw on the head of which a displacement sensor is installed, a reversing motor and a control unit, a register , detached. In order to improve the measurement accuracy due to the elimination of the drift of the null point of the deformograph, a metal bellows was additionally introduced into the deformograph, one the end of which is hermetically connected to the lower end of the stem of the calibration device, and the second end is hermetically connected to the upper base of the deformograph body, the metal bellows of the strain sensor are hermetically connected to the upper base of the deformograph body and the other end is sealed to the first end of the additionally inserted stem mounted axis of the bellows, with the rod passed through a hole in the upper base of the body and rigidly connected to the metal screen with its second end, at prices On the one side of the screen a light-emitting diode is installed symmetrically to the hole, on the other hand a differential photocell of the photoelectric converter rigidly connected to the upper base of the body, and the upper base of the body made in the form of a glass hermetically connected to the body and sealed with a lid,, 0 five 0 Compiled by M. Spassky R. yes; ktor N. Rogulich Tekhred L. Olya ik Proofreader E. Roshko Order 3393/47 Circulation 728 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035 Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, st. Project, 4 one