Deep water oil and gas well overflow monitoring method

Abstract

The invention discloses a deep water oil and gas well overflow monitoring method. The deep water oil and gas well overflow monitoring method comprises the following steps: equidistantly mounting pressure sensors on a water spacing tube according to water depth, measuring circular fluid pressure in the water spacing tube in real time, then transmitting pressure information which is measured by thepressure sensors in real time to a ground control system, and processing and analyzing the measured information of the pressure sensors of the water spacing tube by the ground system to obtain measurement pressure difference between the two adjacent sensors. According to the ground system, drilling fluid is pumped in through a wellhead, the pressure difference between the two adjacent sensors is obtained in combination with a flow and pressure difference relation, the pressure difference measured by the pressure sensors is compared with the pressure difference calculated by the flow and pressure difference relation, overflow in the water spacing tube is monitored and recognized, an alarm is given, and a reasonable well control measure is provided. Underground early overflow monitoring precision is improved, underground early overflow can be recognized in time, the position of overflow fluid in the water spacing tube is determined, the reasonable well control measure is taken, and saferunning of drilling of oil and gas wells is ensured.

Description

technical field [0001] The invention belongs to the technical field of production safety monitoring in oil and gas drilling engineering, and in particular relates to a deep water oil and gas well overflow monitoring method. Background technique [0002] At present, during the drilling of deepwater oil and gas wells, due to the special marine environment, deepwater well control is affected by drilling water depth, deep water low temperature, natural gas hydrates, long choke pipelines, and narrow drilling fluid safe density window. Shallow water drilling well control and land drilling well control are more complex and riskier. Therefore, more effective well control measures are required for deepwater drilling, and the most effective well control measure is early monitoring of downhole overflow. It continues to happen, eventually leading to uncontrollable overflow, and even blowout accidents, causing huge economic losses, casualties and marine pollution. In order to ensure th...

AI Technical Summary

Problems solved by technology

For example, "China Offshore Oil and Gas", Volume 28, Issue 1, 2016 "Research on Ultrasonic Gas Intrusion Real-time Monitoring Technology of Deepwater Drilling Riser", this method installs an ultrasonic device at the riser joint to measure the flow in the riser in real time. Downhole overflow monitoring, but this method has low measurement accuracy, is greatly disturbed by drilling tools, and has high cost, and it is only for riser gas intrusion monitoring

Images