SU558188A1 - Capillary pressure measuring device - Google Patents

Description

one

The invention relates to the field of instrumentation technology, in particular to devices for measuring capillary pressure in rock samples.

BACKGROUND OF THE INVENTION A measure for kailli pressure is known, comprising a base, a working chamber, hydraulically connected with a pressure setting device and a measuring burette (1).

The known devices do not contain irribors, providing an automatic volume of indications of the position of the liquid level in the measuring burette.

Pressure measuring devices are known, including a base on which several measuring tubes are arranged annularly about the axis of the device, and an automatic tracking device, for example, with photoelectric level converters (2).

Known photo-optical level converters containing a light source, the luminous flux from which passes through a fiber and a level sensor on a photosensitive elementite (3).

It is also known a device for measuring pressure, comprising a device on which a movable carriage is attached an injection element of a drum-type recording device (4).

In the known devices, the level measurement that occurs in the time interval between two consecutive measurements cannot be recorded, which excludes the possibility of timely compensation of changes and continuous recording of the level. In addition, in the known devices, the carriage with the illuminator and the photocell moves relative to the fixed manometric tube, which excludes the possibility of maintaining the pressure at a predetermined level.

To enable simultaneous measurement of capillary pressure in several samples in the proposed device, additional measuring burettes are placed symmetrically along a circumference, the center of which is aligned with the axis of the drum of the recording device, and the photosensitive elements of the photo-optical level converters are connected with an optical source of light installed over and coaxial with drum recording device.

FIG. 1 shows a general view of the described device; in fig. 2 - the same, top view.

The device consists of working chambers 1 with i-permeable membranes, hydraulically connected with pressure setting device 2 and measuring burettes 3, which are arranged symmetrically with respect to the rotation of the drum 4 and carry recording pens 5 in contact with the drum 4 filled with paper tape. The measuring burettes 3 are kinematically connected via block 6 to the electric motor 7. A glow lamp 8 is located above the drum 4 and connected to optical fibers 9 installed opposite the measuring burettes 3. Photodiodes 10 which are sensitive elements of the control unit 11 are located on the optical fibers. burettes 3 are floats 12.

The device works as follows. At the moment of switching on, the floats 12 are installed so that the luminous flux from the incandescent bulb 8 does not fall on the photodiodes 10. The rocks (collector) under study are placed in the working chambers 1, into which pressure P (t) is supplied from the pressure unit 2. As a result of the pressure, the water, initially saturating the rock samples, is filtered through a semipermeable membrane, the liquid level in burettes 3 increases, the floats 12 move upwards, and the luminous flux supplied to the measuring buretals 3 via optical fibers 9 falls on the photodiodes 10. Control units 11 triggered, and the measuring buretas 3 move progressively downward through the block 6 and the electric motor 7 until such time as the floats 12 close the light fluxes from the optical fibers 9 to the corresponding photodiodes 10. Recording e per 5 when moving burettes 3 graphically recorded on paper drum 4 quantity of water displaced respectively from each rock sample over time, and which is judged on the magnitude molecular kaiill pressure.

The device provides the ability to simultaneously measure capillary pressure in several samples, simplifies the control of the experiment. Recording the capillary pressure curves in one diagram improves the accuracy of the readings and reduces the time for analyzing the curves.

Claims (2)

1. “Proceedings of the meeting on the development of research in the field of secondary methods of oil production, AI Lz. SSR, Baku, 1953, p. 253. 2. Gorli S. M. et al. “Aeromechanical measurements, 1964, p. 367-368.