Cuttings bed identification method and position determination method

Abstract

The invention provides a cuttings bed identification method and a position determination method. The identification method comprises the steps of: arranging a plurality of signal receiving points in awell, determining whether the position of each signal receiving point in the well corresponds to the cuttings bed or drilling liquid according to the time interval between a transmitted detection signal and a received return detection signal, and obtaining a detection result; setting a coding rule, coding the detection result by using the coding rule, and obtaining a coding result; transmitting the coding result to the ground and decoding the coding result, identifying the cuttings bed after decoding, and obtaining a decoding identification result; drawing a cuttings bed simulated diagram according to the diameter of a wellbore and the decoding identification result, and completing the cuttings bed identification. The position determination method comprises determining the position of thecuttings bed in the well according to the position of the signal receiving points. The invention can identify and monitor the condition of the underground cuttings bed in real time, and can optimizedrilling measures according to the obtained cuttings bed simulated diagram, so as to perform the continuous drilling work conveniently.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration, and more specifically, relates to a cuttings bed identification method and a position determination method. Background technique [0002] In petroleum drilling, cuttings bed is one of the most common and most harmful problems in extended-reach horizontal well drilling. The hazards of the cuttings bed are as follows: slow down the drilling speed of the machine and the construction progress, increase the construction cost, damage the drilling tools due to the increased torque, and frequent accidents such as drill sticking. With the extensive deployment of extended-reach horizontal wells for offshore and onshore shale oil and gas drilling, a series of problems caused by cuttings beds have become more and more serious. [0003] At present, the identification of cuttings beds still relies on theoretical analysis and calculation, software simulation, and experimental devi...

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Problems solved by technology

[0003]At present, the identification of cuttings beds still relies on theoretical analysis and calculation, software simulation and experimental device simulation, etc. The above methods cannot realize real-time identification and identification of cuttings beds in the underground. Moreover, with the adjustment of working conditions, the results of theoretical analysis and experimental device simulation are different from the real situation, which cannot truly reflect the characteristics of the downhole cuttings bed, which is not conducive to drilling construction

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