Self-adaptive casing pipe centralizer for oilfield exploitation

Abstract

The invention belongs to the field of oil exploitation, and particularly discloses a self-adaptive casing pipe centralizer for oilfield exploitation. The self-adaptive casing pipe centralizer comprises a locking limiting unit, a shaping limiting unit and two end fixing units. A centralizing mechanism is arranged between one side of each of the two end fixing units and the locking limiting unit. Each end fixing unit comprises two semi-ring mechanisms which are in sliding connection with each other, the semi-ring mechanism comprise end plates, one end of each end plate is fixedly connected withan adjusting plate, cavities are formed in the inner walls of the end plates, and locking grooves are formed in the bottoms of the inner walls of the cavities. According to the self-adaptive casing pipe centralizer for oilfield exploitation, centralizing operation on casing pipes of multiple diameters can be achieved, and the device using flexibility is improved; and by arranging the two end fixing units, the locking limiting unit and the shaping limiting unit, centralizing operation is carried out on the casing pipes at multiple positions, the supporting force is high, and the centralizing effect is good.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to an adaptive casing centralizer for oilfield development. Background technique [0002] With the rapid development of my country's economy, the demand for oil and gas has grown rapidly. Oil and gas wells are holes drilled in the formation according to a certain well layout system specially for the extraction of underground oil or natural gas; or wells converted from other wells for oil and gas production. Casing is generally run in the well, and cement is injected between the outer wall of the casing and the well wall to maintain the well wall and seal the aquifer, and isolate different oil layers; oil and gas pipes are also run in the casing. [0003] Oil and gas well engineering is a capital and technology-intensive project implemented around the construction, measurement and protection of oil and gas wells, mainly including oil and gas exploration and development drilling and c...

AI Technical Summary

Problems solved by technology

Existing centralizers have large outer diameters and relatively fixed inner diameters, making it difficult to centralize casings with different diameters, and have poor flexibility in use; Insufficient supporting force, poor centralization effect, and due to a certain degree of borehole diameter expansion, the existing centralizer cannot be adjusted for deformation, and the connection with the well wall is poor, so it is difficult to ensure that the casing is centered

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