Petroleum casing accurate positioning device and method based on geomagnetic anomaly mark
A geomagnetic anomaly and oil casing technology, which is applied in earthwork drilling, measurement, wellbore/well components, etc., can solve problems such as inability to locate accurately in real time, and achieve cost-saving inspections, strong practicability, and no need for manual intervention Effect
Active Publication Date: 2022-08-05
SOUTHWEST PETROLEUM UNIV +1
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Problems solved by technology
[0005]
Aiming at the technical situation that the existing oil and gas well casing operation cannot be accurately positioned in real time, the present invention proposes a precise positioning method for oil casing based on geomagnetic anomaly marks based on the geomagnetic field, magnetization theory and magnetic field detection and acquisition technology
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[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.
[0028] like Figure 1-4 As shown, the present invention provides a precise positioning device for petroleum casing based on geomagnetic anomaly markers, which includes a plurality of permalloy rings sleeved on the petroleum casing 10, a geomagnetic anomaly marker positioning device 15, Four upright support rods 11 on the outside of the tube. A start ring 8 and a stop ring 9 composed of 2-4 permalloy rings are respectively set on the casing, and the rest of the permalloy rings are located between the start ring and the end ring and are distributed in the oil casing according to a pre-designed arrangement rule. tube. The permalloy ring is fixed on the casing by welding or embedd...
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Abstract
The invention discloses an accurate positioning device and method for a petroleum casing pipe based on geomagnetic anomaly markers.The outer wall of the petroleum casing pipe is sleeved with a plurality of permalloy rings, a starting ring and a stopping ring are arranged, and the other permalloy rings are distributed on the petroleum casing pipe according to a pre-designed arrangement rule; the intensity of a magnetizing field generated by magnetization of the permalloy ring is greater than that of a surrounding geomagnetic field and a magnetizing field generated by the sleeve; the permalloy ring is magnetized in a geomagnetic field so as to influence the gradient distribution of the magnetic field around the sleeve and form geomagnetic anomaly; the geomagnetic anomaly marking and positioning device is tripped into the sleeve at a constant speed, an induction coil is arranged at the head of the geomagnetic anomaly marking and positioning device, and when the geomagnetic anomaly marking and positioning device sequentially passes through the permalloy rings in the sleeve, the induction coil generates induced electromotive force, collects electromotive force signals and analyzes and processes the electromotive force signals; and the number information of permalloy rings passed by the geomagnetic anomaly mark positioning device is determined, so that accurate positioning is realized.
Description
technical field [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to a precise positioning device and method for petroleum casing based on geomagnetic anomaly marks. Background technique [0002] Due to the characteristics of invisible, difficult to detect, wide nodes, complex type, and easy environmental interference of characteristic signals in oil and gas downhole casing operations, it is difficult for us to grasp the specific position of the tool when the tool reaches the well section when the cableless tool is operating downhole, and the positioning is often There is a certain deviation, which makes it impossible to monitor and analyze the downhole operation in real time, which brings more unstable factors to the next operation. Therefore, it is important to monitor and analyze the actual position of the downhole tool in real time during the operation of the downhole tool in order to make timely decisions, optimize effi...
Claims
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Login to View More IPC IPC(8): E21B47/092E21B47/04
CPCE21B47/092E21B47/04Y02A90/30
Inventor 王其军李名盛曾治超卢发明寇宇
Owner SOUTHWEST PETROLEUM UNIV