Differential pressure type gas cutting and displacement type gas cutting judging method and device

Abstract

The invention discloses a differential pressure type gas cutting and displacement type gas cutting judging method and device. The differential pressure type gas cutting and displacement type gas cutting judging method comprises the steps that firstly, actual outlet flow time sequence data and vertical pipe pressure differential coefficient time sequence data are obtained; then, according to well drilling parameters, standard outlet flow time sequence data and / or standard vertical pipe pressure differential coefficient time sequence data under differential pressure type gas cutting and displacement type gas cutting are respectively obtained; the similarity of the actual outlet flow time sequence data and the vertical pipe pressure differential coefficient time sequence data and the standardoutlet flow time sequence data and / or standard vertical pipe pressure differential coefficient time sequence data under differential pressure type gas cutting and displacement type gas cutting is calculated, and a gas cutting mode is judged according to the similarity. The gas cutting type can be quickly judged and the well drilling risk can be reduced by adopting the differential pressure type gas cutting and displacement type gas cutting judging method, the operation is simple and convenient, and the device demands are few.

Description

technical field [0001] The invention relates to the technical field of judging annular air intrusion modes during natural gas drilling, in particular to a method and device for judging differential pressure air intrusion and displacement air intrusion. Background technique [0002] With the increasing pressure of environmental protection and technological progress, the low-carbon trend of global energy consumption is becoming more and more obvious. Natural gas, as a high-quality, efficient, green and clean low-carbon energy, will become an important bridge for the transformation of global energy from high-carbon to low-carbon. In order to meet the needs of the country's economic development for clean energy, natural gas development continues to move toward deep and complex formations. However, deep and complex formations often have the characteristics of high temperature, high pressure, and narrow density safety window. Drilling accidents are complex and frequent, and drillin...

AI Technical Summary

Problems solved by technology

Although this method can judge differential pressure gas kick and displacement gas kick, its use conditions are limited, and it is only applicable to the process of managed pressure drilling with back pressure applied. In addition, the delay time of deep wells is generally several hours, and the time required for judgment Long, unable to meet the well control safety requirements for rapid treatment of gas intrusion

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