SU977739A1

SU977739A1 - Device for measuring length and tensioning of cable

Info

Publication number: SU977739A1
Application number: SU813250984A
Authority: SU
Inventors: Юрий Дмитриевич Емельянов; Александр Васильевич Иванников; Андрей Федорович Пряхин; Николай Митрофанович Цыпченко
Priority date: 1981-02-11
Filing date: 1981-02-11
Publication date: 1982-11-30

Description

(54) УСТРОЙСТВО ДЛЯ ИЗМЕРЕНИЯ ДЛИНЫ И НАТЯЖЕНИЯ(54) DEVICE FOR MEASURING LENGTH AND TENSION

КАБЕЛЯCABLE

Изобретение относитс к промыслово-геофизическим исследовани м скважин.This invention relates to well logging.

Известно устройство дл измерени длины и усили нат жени кабел динамометр электротензометрический каротажный - ДЭК-1, примен емый совместно с подвесным мерным роликом и системой ИДН-3, устанавливаемой на лебедке подъемника l.A device for measuring the length and tension of a cable with a dynamometer electrostatic logging tool, DEK-1, is used in conjunction with an out-of-measure roller and an IDN-3 system installed on the winch of the elevator l.

Недостатками тензометрических датчиков нат жени вл ютс :. сложность конструкции, мала надежность при эксплуатации в полевых услови х из-за частого нарушени изол ции тензорезисторов, опасность эксплуатации при прострелочно-взрывных работах ввиду наличи электропитани , сравнительно больша погрешность измерени нат жени (л/ 1,5%), что не позвол ет всегда уверенно фиксировать остановки скважинной аппаратуры .The disadvantages of strain gauges are:. design complexity, low reliability when operating in field conditions due to frequent breakdown of insulation of resistance strain gages, danger of operation during shooting and blasting operations due to power supply, relatively large error in tension measurement (l / 1.5%), which does not allow always confidently fix the downhole equipment stops.

Наиболее близким к предлагаемому по технической сущности вл етс устройство, включающее опорную раму , на которой смонтирован два ролика и датчик .давлени , совмещенный с исполнительным гидроцилиндром, подвижна часть которого соединенаThe closest to the proposed technical entity is a device that includes a support frame on which two rollers and a pressure sensor are mounted, combined with an actuating hydraulic cylinder, the movable part of which is connected

с прижимньм шкивом, предназначенным дл воспри ти силы нат женийГ кабел , огибающего шкив. Исполнительный гидроцилиндр гидравлически св зан, с индикатором нагрузки и гидроцилиндром переключени пределов измерени f 2.with a pinch pulley designed to absorb the tension of the cable around the pulley. The actuating cylinder is hydraulically coupled to the load indicator and the switching cylinder of the measurement limits f 2.

Недостатком устройства вл етс отсутствие возможности измерени The drawback of the device is the lack of measurement capability.

10 длины кабел в процессе .геофизических исследований скважин. Это вызвано тем, что устройство имеет весьма малые углы охвата шкивов при измерении средних и больших нат жений, 10 cable lengths in the process of well logging. This is due to the fact that the device has very small angles of coverage of the pulleys when measuring medium and large tensions,

15 что не позвол ет использовать какойлибо из них в качестве мерного ролика по причине проскальзывани ;, измер ема сила нат жени зависит от диаметга кабел , а перемещение 15 which prevents the use of any of them as a measuring roller due to slippage; the measured tension force depends on the diameter of the cable, and the movement

20 прижимного ролика под нагрузкой не поддаетс точному учету. Ввиду изменени угла охвата подвижного ролика цена делени в показани х индикатора при разных нагрузкахThe 20 pinch roller under load is not accurately counted. Due to the change in the angle of coverage of the moving roller, the price of division in the indicator readings at different loads

25 различна, т.е . шкала нелинейна,что характернр дл всех датчиков подобного .типа..25 is different, i.e. the scale is non-linear, which is characteristic of all sensors of a similar type.

Claims

The purpose of the invention is to expand the functionality of the device; simultaneous measurement of the length and magnitude of cable tension, as well as improvement of measurement accuracy. This goal is achieved by the fact that in the device for measuring the length and tension of a cable containing a support frame, a hydraulic cylinder with a plunger connected through a hydraulic line with a force indicator, roller, one of which is measured, fixed on the lever connected to the cylinder of the cylinder, the measuring roller is made split with adjustable circumference, and its axis is fixed in the center of the lever one end of which is connected to The frame has a hinge and the other with a hydraulic ram plunger. The drawing shows the device, General view. The device includes a support frame 1, on which the rollers 2 are mounted on moving axles, the measuring roller 3 on the lever 4. The large-scale measuring roller has an elastic rim with a slit, the size of which adjusts with the micrometric screw 5. cable b. One end of the lever is attached to the hinge 7, and the other is connected to the plunger 8, the hydraulic tension sensor 9, which is connected to the tension indicator 10 by the pipe 11. The movable measuring roller is set so that the angle of its coverage is constant and increased that the cable slippage is eliminated, and the roller itself is made split, adjustable along the circumference,. Practically, at a load of 60 kN, the maximum movement of the axle roller is less than 0.0015 m, i.e. the coverage angle remains constant / V БО while the indicator scale is non-linear 0.1%. The device works as follows: The micrometer screw 5 adjusts the circumference of a dimensional roller for the type of cable so that one rotation of the roller corresponds to the movement of one meter of cable b. The cable, straining to straighten, presses on the measuring roller 3, which, through lever 4, transmits force to plunger 8 and, through a flexible pipe, to tension indicator 10, from which the cable tension readings are visually measured. Because the movement of the measuring roller 3 vertically is small (0.0015 m), the angle between the directions of tension forces does not change, i.e. The resulting force is directly proportional to the load on the cable and the tension indicator scale is almost linear in the range of 0-50 kN. Since the ratio of the arms of the lever is .2: 1, the plunger moves with a double amplitude, which increases the sensitivity of the measurement of the tension forces. The invention The device for measuring the length and tension of a cable, comprising a support frame, a hydraulic cylinder with a plunger, connected via a hydraulic link with a force indicator, three bypass rollers, one of which is measured on a lever connected to the hydraulic cylinder plunger, which is different that, in order to improve measurement accuracy, the measuring roller is made split with an adjustable circumference, and its axis is fixed in the center of the lever, one end of which is connected to the support frame, hinge, and the other to the plunger guide rotsilindra. Sources of information taken into account in the examination 1. The diameter of the electrotometric logging DEK-1. Prospect VDNH. USSR Ministry of Geology, NPO Geophysics, M., Nedra, 1978.

2. Authors. USSR certificate № 630405, cl. E 21 B 47/00, 1977.