Double-layer four-arm polygonal eccentering device

Abstract

The invention provides a double-layer four-arm polygonal eccentering device. The device comprises a main base body and eccentering arms, wherein the main base body and the ccentering arms are used forinstalling underground measuring equipment. Each eccentering arm comprises a pole plate used for being in contact with a well wall, a rotating main arm, a sliding main arm and a hydraulic device, wherein the rotating main arm and the sliding main arm are in shaft connection with the two ends of the pole plate respectively; the other end of the rotating main arm and the other end of the sliding main arm are connected with a sliding mechanism capable of sliding axially in the main base body; a limiting arm is formed in the space formed by the pole plate, the rotating main arm and the sliding main arm, one end of the limiting arm is connected with a pole plate shaft, and the other end of the limiting arm is connected with the sliding mechanism capable of sliding axially on the main base body; the hydraulic device is used for providing power. The eccentering arms are connected relative to the main base body through the sliding structure, so that the whole supporting shape of the eccentering arms are not limited to a fixed shape and can be adaptively changed according to the stress angle of the pole plates, therefore, the eccentering arms can adapt to the well wall in any shape, the staying stability of the eccentering device is improved, and meanwhile the accuracy of data measuring is improved.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a four-arm polygon pusher which can be formed by connecting a plurality of pushers. Background technique [0002] With the development of the oil industry, the exploration technology of oil exploration is constantly updated. The thruster has always been an important part of the exploration equipment in the field of oil exploration, and is used to measure various data of the current drilling, such as inclination. Existing pushers use a plurality of pusher arms symmetrically distributed on the periphery of the main body to contact the well wall to support the main body for various measurements downhole. [0003] The existing push arm generally includes a pole plate in contact with the well wall, and support arms connected to the main base at both ends of the pole plate, and the rotation steps of the two support arms in the supporting process are the same, that is, the pole pla...

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Problems solved by technology

[0003] The existing push arm generally includes a pole plate in contact with the well wall, and support arms connected to the main base at both ends of the pole plate, and the rotation steps of the two support arms in the supporting process are the same, that is, the pole plate No matter how the well wall shape changes, the isosceles trapezoid shape formed with the support arm can only be adapted by changing the height of the isosceles trapezoid. Under this support structure, once the current support point of the polar plate is unstable, it is easy to lower the main matrix stability, thus affecting the measurement results

[0004] In addition, most of the existing pushers work independently, that is, each time the measurement is performed by one pusher, this structure also limits the measurement method and reduces the measurement effect

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