Fracture-hole detection system and detection method while drilling based on nano-magnetic fluid drilling fluid

Abstract

The invention relates to a detection system and method for cracks and caverns of fractured-vuggy carbonate reservoirs along with drilling based on nanometer magnetic fluid. The detection system comprises a real-time data collecting and processing center, a communication circuit for a ground magnetometer and the real-time data collecting and processing center, a high-voltage pump set, a first transmission pipeline, a second transmission pipeline, a first control valve, a second control valve, a magnetic fluid container, a drilling fluid pond, an control pipeline for an adjacent well applied magnetic field generator, a third transmission pipeline, a drilling fluid return pipeline, the ground magnetometer and the adjacent well applied magnetic field generator, wherein the adjacent well applied magnetic field generator is connected with the real-time data collecting and processing center through the control pipeline, and the ground magnetometer is connected with the real-time data collecting and processing center through the communication circuit. According to the detection system and method for the cracks and the caverns of the fractured-vuggy carbonate reservoirs along with drilling, the defect that logging information can not be obtained due to the fact that a well goes into operation when the cracks and the caverns of the well are not completely drilled through so that the drilling risks can be avoided is overcome, and the identification accuracy and the detection range of layers of the cracks and caverns are improved.

Description

technical field [0001] The invention belongs to the field of petroleum drilling engineering, and in particular relates to a detection system and a specific implementation method for cracks and caves in the drilling process of fracture-cavity reservoirs in carbonate formations, in particular to a nano-magnetic fluid-based carbon System and method for detecting fractures and caves while drilling in salt rock reservoirs. Background technique [0002] According to statistics, more than 50% of the oil and gas field reservoirs in the world are carbonate rock fractured and dissolved cave reservoirs, which are the so-called fractured cave reservoirs. The reservoir space of fractured-vuggy carbonate reservoirs is mainly fractures, dissolved vugs, and unfilled caves with a vertical and horizontal scale of several meters or even tens of meters. The formation zone with fractures and karst caves is the main leakage channel of drilling fluid during the drilling process. When drilling in ...

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Problems solved by technology

However, as mentioned above, when drilling in carbonate fractured-cavity reservoirs encounters fractures and karst cave formations with obvious mud loss during drilling, in order to avoid possible serious drilling accidents (drill bit drop, drilling rod fractures, etc.), the top of the reservoir section is often drilled, tested, and put into production. Most wells that encounter formations with fractures and karst caves do not completely drill through the fractures and karst caves. The logging along the wellbore profile The method cannot effectively evaluate the vertical size of fractures and caves; moreover, the detection range of geophysical logging methods is limited to within 1m of the wellbore, and the development zone of fractures and caves with a scale of hundreds of meters or even thousands of meters and Its connectivity cannot be detected

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