SU1420362A1 - Hydraulic device for measuring perimeter of inner surface of casing string - Google Patents

Abstract

The invention relates to a measurement technique and can be used to control the perimeter of the inner surface of the casing. The purpose of the invention is to improve the measurement performance by using the fluid pressure inside the column. The perimeter gauge in the form of a flexible tape 5 with a frame 7 is stretched by a balloon 3 under the action of a fluid injected into the balloon by a hydraulic booster, in which the larger piston 9 is under the action of the fluid pressure in the column, 1 sludge.

Description

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The invention relates to a measurement technique and can be used to measure the internal size of a casing string during an inspection of the technical state of oil, gas and other wells.

The purpose of the invention is to improve the measurement performance by using the pressure of the surrounding medium.

The drawing shows a schematic diagram of the device.

The device contains a housing 1 with a jet 2, mounted on the housing elastic cylinder 3 with sliding contact elements 4, in the grooves of which there is a displacement meter consisting of a flexible elastic belt 5 with a scale 6 and a frame 7 moving along the tape under the action of a pusher 8, located at the other end of the belt 5, g single amplifier, Kotoporo upper piston 9 is larger than lower piston 10 and shut-off valve 11 connected through tip 12 with cable-cable 13. Holes 14 are made in the upper part of the body valve 11 communicates with the environment intensifier input, and through the nozzle 2 communicates with the environment cylinder 3. Under the action of spring 15 occupies its initial position hydraulic actuator. The cavity A between the pistons is isolated from the environment and contains air. The cavity is filled with fluid.

The device on the cable line 13 is lowered into the well of the string 16 to the place of measurement of the perimeter of the casing. The cable-cable 13 is electrically signaled to open the solenoid valve 11, the valve opens and the surrounding body 1 enters the hydraulic booster, which

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due to the difference in the areas of the pistons 9 and 10, it injects fluid with an increased pressure into the cylinder 3 until the contact elements 4 are pressed into the casing 16. This position of the contact elements will be fixed by the frame 7 moved by the pusher 8. The pistons are lowered as the liquid through the nozzle 2 forced out into the surrounding space. When the hydraulic booster pistons are lowered to the lowest position, the pressure inside and outside the cylinder is equal and it returns to the initial position together with the contact elements. The device is then removed from the well and the perimeter of the inner surface of the column at a controlled location is determined from the position of the frame relative to the scale 6.

Thus, the implementation of the pump in the form of a hydraulic booster makes it possible, without additional time and cost, to carry out the measurement using ambient pressure.

Claims (1)

Invention Formula A hydraulic device for measuring the perimeter of the inner surface of the casing, comprising a housing, an elastic cylinder mounted on the housing with sliding, contact elements, a displacement meter of contact elements in the form of a flexible tape with a scale and a frame mounted for movement along the tape, and a pump characterized by that, in order to increase the measurement performance, the pump is designed as a piston hydraulic booster, the input of which is communicated through a shut-off valve with the environment, the output is from the cylinder And the cylinder cavity is connected through a jet with the surroundings.