A variable-diameter centralizer activated by radio frequency identification technology and its application method

Abstract

The invention discloses a variable-diameter centralizer activated by a radio frequency identification technology and a using method, and belongs to the technical field of oil-gas well engineering. Thevariable-diameter centralizer comprises a single-arch-shaped elastic centralizer, a steel belt buckle, a steel belt, an RFID reader activation assembly and an RFID electronic tag hollow rubber plug,wherein the steel belt buckle is fixed to the middle part of a centralizing strip of the single-arch elastic centralizer through welding, and the RFID reader activation assembly is fixed to one end ofthe steel belt; the RFID electronic tag hollow rubber plug is lowered into the variable-diameter centralizer through the interior of a casing pipe, a certain number of RFID electronic tag single bodies are released through pressure building, and the RFID electronic tag single bodies enter an annulus from the bottom of the casing pipe under the impact of well washing liquid and gradually float upwards; and a RFID reader circuit board continuously transmits radio frequency signals, after signals fed back by the RFID electronic tag single bodies are tested, the signals are transmitted to a motorcontrol circuit board, the motor control circuit board controls a micro motor to rotate and open threaded connection of a screw and holes in the two ends of the steel belt, a screw shaft control component moves upwards integrally, then the steel belt is released, the centralizing strip is bounced off, the centering degree of the casing pipe is ensured, and the casing pipe descending time is shortened. The variable-diameter centralizer activated by the radio frequency identification technology is simple in design, low in machining cost and convenient to assemble.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well engineering, in particular to a variable-diameter centralizer activated by radio frequency identification (RFID) technology and a usage method. Background technique [0002] During the cementing process, the casing centering degree in the wellbore is an important factor affecting the displacement efficiency. If the centering degree is poor, it is easy to form wide and narrow sides. When the drilling fluid is replaced, the cement slurry is easy to go up along the wide sides, so that the drilling fluid on the narrow sides is not cleaned or cannot be replaced, which will seriously affect the cementing quality. The most effective way to improve the centering degree is to use centralizers. However, the outer diameter of rigid centralizers is too small to play a centralizing role in irregular well sections, pot-bellied well sections, and candied gourd well sections. Among elastic centralizers, ...

AI Technical Summary

Problems solved by technology

Poor centering, easy to form wide and narrow sides, when replacing drilling fluid, the cement slurry is easy to return along the wide side, so that the drilling fluid on the narrow side is not clean or can not be replaced, which will seriously affect the cementing quality

The most effective way to improve the centering degree is to use centralizers. However, the outer diameter of rigid centralizers is too small to play a centralizing role in irregular well sections, pot-bellied well sections, and candied gourd well sections. Among elastic centralizers, centralizers with large deformation It is easy to cause the friction resistance of the casing to increase

Therefore, there is an urgent need for a variable-diameter centralizer, which binds the centralizer before entering the well, and solves the problem of high friction resistance when the casing is run into the well

Images