Near-bit magnetic field imaging positioning measuring instrument and working method

Abstract

The invention discloses a near-bit magnetic field imaging positioning measuring instrument and a working method, and belongs to the technical field of oil drilling measurement. The near-bit magnetic field imaging positioning measuring instrument comprises a drill bit, a near-bit magnetic field imaging positioning short section, a power drilling tool, a wireless short pass transmitting assembly, awireless short pass receiving assembly, a ground receiving device and a processing computer. A non-magnetic drill bit and a non-magnetic near-bit magnetic field imaging positioning short section are adopted to form a stable magnetic anomaly detection environment nearby the drill bit, a magnetic field acquisition sensor can perform three-dimensional detection on a three-dimensional space nearby thedrill bit during rotation, the positions of anomalous fields can be accurately measured, and range information is given; and a ground computer visually displays the anomalous fields in front of the drill bit in real time on a screen according to the measured information, the interaction position of nearby sleeves and the drill bit can further be identified, and collision early warning and suggestions on pile wrapping are made.

Description

technical field [0001] The invention relates to the technical field of oil drilling measurement, in particular to a magnetic field imaging positioning measuring instrument near a drill bit and a working method. Background technique [0002] In the anti-collision of dense slave well groups and horizontal well drilling projects in old well areas, it is necessary to identify adjacent wellbores that may appear near the drill bit to prevent the collision of wellbores from causing major economic losses and major risks. Due to the existence of adjacent well casings near the drill bit in this type of project, conventional azimuth measurement instruments using the earth's magnetic field are prone to encounter abnormal magnetic fields and cause large errors. Short distances and inaccurate measurements may cause borehole collisions. [0003] At present, the main method is to increase the distance between the wellheads of the secondary well group, and design the technical solutions of h...

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Problems solved by technology

[0004] However, the above methods are all based on the analysis and prediction of adjacent well data to obtain trend conclusions. These calculations have great uncertainty, lack of real-time downhole measurement technology, and cannot obtain real-time data on the distance and direction of adjacent wellbore, which cannot truly reflect The exact position and distance of the casing in the adjacent well in front of or near the drill bit, the original anti-collision technical solution resulted in higher anti-collision economic investment and greater risk of wellbore collision

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