Objective The purpose of this study is to accurately locate the circulation loss layer during the drilling of oil and gas fields, and provide support for the control of loss, improve the success rate of curing loss.

Methods Due to the abnormal temperature change caused by a large amount of drilling fluid loss in the circulation loss layer, a downhole measuring ball equipped with a microchip was circulated in the well to obtain downhole temperature and pressure distribution data, and then the downhole temperature distribution law was established based on these data, compared with the ideal temperature distribution law, which can more accurately locate the circulation loss layer.

Results The experiment shows that the temperature and pressure data in the well can be obtained by capturing the microchips returned from the wellhead, and then the temperature gradient change data can be smoothed, and the more accurate loss zone can be analyzed by using the data.

Conclusions Locating leakage points based on microchip measurement data is a new, low-cost and convenient method for downhole leakage diagnosis, which is a very valuable and representative application scenario of innovative downhole measurement microchips.