SU1574804A1 - Borehole profilometer - Google Patents

Abstract

This invention relates to well testing. The goal is to increase reliability. The device includes a housing 1, a spring-ski 2, a permanent ring magnet 3 mounted on the sleeve 4, a movable contact 7, a resistive element 8, a current source 9, a recording unit 10. To achieve the goal, the device has a cylindrical diamagnetic rod 5 with flow holes 6 along the generatrix. The movable contact 7 is made in the form of steel balls, and the resistive element 8 is in the form of a bifillary winding mounted on the surface of the rod 5. The balls 7 are installed inside the closed channels formed by the recesses 6 and the winding of the resistive element 8. When the borehole diameter changes, the magnet 3 slides along housing 1 and holds all the contacts 6 in the same plane. The latter are pressed against the inner surface of the turns of the winding of the element 8. The resistance in the circuit is recorded by the block 10. The latter indicates the diameter of the well. The use of the device allows for measurements at elevated temperatures in the well. 2 Il.

Description

The invention relates to devices for the study of the technical condition of wells with a caliper and profile measurement method.

The aim of the invention is to improve reliability

Fig. 1 shows the construction of the profipemera; Fig 2 shows an enlarged section of the profiler in the area of moving contacts.

Borehole profiler case 1, spring-skis 2 permanent magnet 3 on the ring and mounted on the end of the spring skis 2, a cylindrical rod 5 of dielectric and diamagnetic material with flow-through cavities 6 along the generatrix, movable contacts 7S made with cs mag num o-1 and electrically conductive material in the form of balls, the 8S protective element wound bifi ™ continuously from the bottom upwards on the rod, and the terminals of the resistive element 8 form a closed electrical circuit with a power source 9 and a recording unit 10c, Pr Dinner-skis 2 are made with the possibility of interaction with the walls of the casing 11 wells, a permanent ring magnet 3 is fixed above the sleeve k "The second end of the spring-skis. fixed to the housing 1.

The coils of the resistive element 8 and the recesses 6 form closed channels in which the contra-balls 7 are placed with the possibility of moving into the recesses 6 and contacting the coils of the resistive element B. The element 8 is covered with a thin insulating material that is absent from the flavor of the closed channels. made of non-magnetic material number

0

five

0

five

five

recesses 6 can be any: from one or more

The device works as follows.

When the profiler moves along the walls of the casing 11 of the spring-ski 2, the borehole profile is monitored. The change in the borehole profile or the distribution of the ski-spring 2 (narrowing of the trunk), or the radius of the bend-skis 2 decreases (expansion of the trunk). Changing the bending radius of the spring-skis 2 is transferred to the movable sleeve H with the permanent ring magnet 3 The ring magnet 3 keeps all moving contacts 7 in the center in the same plane, pressing them against the stripped turns of the resistive element 8 "When the ring magnet moves 3 along the body 1 movable contacts 7 is a track displacement NIES thus varies the resistance of the resistive element 8, the scale 10 registers block.

Winding the resistive element 8 bifillary (counter) allows eliminating the formation of an additional magnetic field, as well as bringing the ends of the winding to one side of the device - upwards, which allows to improve the preventive maintenance and repair of the profiler.

The profiler design allows its use at elevated X temperatures in the well.

Claims (1)

Invention Formula A borehole profiler, including a case, on the outer surface of which springs-skis are fixed, at the ends of which there is an annular sleeve with an annular permanent magnet — a resistive element, a moving contact, current sources and a registering unit, the sleeve with a magnet mounted to extend the body and longitudinal movement along it, differing It is equipped with a core made of a dielectric and diamagnetic material and having a groove 80 6 recesses along the generatrix located at the same distance from each other, the resistive element and the moving contact, respectively, made in the form of turns of the conductor and the contact contacts made of magnetic and electrically conductive material, bifiltered on the surface of the rod; the balls are installed in flow-through recesses with the possibility of interaction with the turns of the conductor. A-A (increased) Phage. 2