SU1382937A1 - Deep-well profile gauge - Google Patents

Abstract

This invention relates to well testing. The purpose of the invention is to improve the accuracy of measurement of cavernous wells and simplify the design. The pro- fileter includes a body 1, measuring levers (P) 5. Each of P 5 is made in the form of an elastic spring, which is concave in the direction of the axis of the profiler. One end of the spring is intended for contact with the borehole wall, and the other, with a strain gauge 6 pasted on its surface, is fixed on the housing 1. In the process of lifting, the P 5 slider slides along the borehole walls. In this case, the shape of P 5 varies depending on the amount of movement relative to the body in proportion to the load that occurs. The larger the value of the latter, the smaller the diameter of the well. As a result, the strain gauge 6 is deformed, causing a change in the ohmic resistance, the magnitude of which is proportional to the magnitude of the displacement. 2 Il. about $ (L

Description

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The invention relates to a device for testing wells and can be used to measure the cross-section and longitudinal profile of boreholes.

The purpose of the invention is to improve the accuracy of measurement of cavernous wells and simplify the design.

FIG. 1 shows schematically the structure of the profiler; Fig 2 is a diagram of the descent of the profiler into the well.

The profiler includes a housing 1 divided by a hermetic partition 2 into two compartments. In the compartment 3, filled with oil, a drive of a force mechanism (not shown) is placed, which serves to bring the profiler into the working position.

In the compartment 4 there are placed measuring levers 5, each of which is made in the form of a concave. Elastic spring, which are fixed in the housing 1 of the scaler. In the place of attachment on the surface of the measuring levers 5, strain gages 6 are pasted, the leads 7 of which are passed through the sealing sleeve 8 of the partition 2 into the compartment 3.

The mechanism for closing the measuring levers 5 consists of a movable holder 9 connected by a rod 10 with a power mechanism (figure 2).

The profiler works as follows.

When the well survey interval is reached, the profiler control panel sends a signal to the force mechanism that drives the rod .10, which moves the sleeve 9 upward and releases the measuring levers 5. The latter are bent and pressed their ends to the borehole walls ..,

In the process of lifting the profimeter, the ends of the measuring levers 5 slide along the walls of the well, while the shape of the measuring levers 5 constantly varies depending on the size of the displacements f relative to the body 1 in proportion to the load

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where K - coefficient taking into account the geometric characteristics of the measuring levers and mechanical properties of the material from which they are made.

The greater the load, the smaller the diameter of the well. As a result, the strain gauges 6 are deformed, causing changes in the ohmic resistance and the electrical signal, the magnitude of which is proportional to the magnitude of the displacement f.

Due to the elastic concave shape of the measuring levers, the point contact of the ends of the levers with the borehole walls is maintained throughout the whole, and an increase in the accuracy of the measurements is achieved. In addition, the continuity of obtaining information when the profiler moves in the well is ensured, jamming of the mechanical system in the drilling mud is eliminated, and the structure of the profiler is simplified, since the measuring levers act as a transmission mechanism and are directly connected to the displacement transducer.

Formula a and 30 b

A downhole propeler, comprising a housing, measuring levers, a displacement transducer, characterized in that, in order to improve the accuracy of measurement of cavernous wells and simplify the design, each measuring lever is made in the form of an elastic spring concave in the direction of the axis of the profiler with ten-resistor, one end of which is intended contact with the borehole wall, and the other, with a strain gauge pasted on its surface, is fixed to the housing.

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Claims (1)

35 Formula of the invention A borehole profiler comprising a housing, measuring levers, a displacement transducer, characterized in that, in order to improve the accuracy of cavernous wells measurement and simplify the design, each measuring lever is made in the form of an elastic spring 45 bent towards the axis of the profiler. _{with a} strain gauge, one end of which is designed for contact with the wall of the well, and the other, with a strain gauge glued on its surface, is mounted on the housing.