Device for measuring downhole flow while drilling and monitoring early overflow

Abstract

Disclosed is a downhole flow measuring while drilling device capable of measuring downhole annular flow, annular pressure and annular temperature and monitoring early overflow while drilling. The measuring device measures downhole annular flow and flow change through an ultrasonic wave sensor mounted at a short section of a drill collar and measures annular pressure and annular temperature through a pressure and temperature sensor mounted inside an annular fluid guiding device, a power source and a circuit board are mounted inside an exploring pipe, physical signals, such as annular flow, pressure and temperature, are converted into electric signals through the sensors, the measuring device records, stores and uploads data through the circuit board, and the measuring device is connected with a MWD (measurement while drilling) through an MWD joint to timely upload actually-measured data to the ground. The device is simple in structure, low in manufacturing cost and long in service life, and working conditions such as downhole overflow can be judged in real time by comprehensively analyzing and processing timely-uploaded downhole data and related data on the ground to achieve the objective of early overflow monitoring, so that safety of well control of well drilling is effectively improved.

Description

technical field [0001] The invention relates to a device and a method for measuring and monitoring early overflow in an annular space while drilling, which are used for monitoring early overflow while drilling oil and gas wells. By measuring the downhole annular flow rate, pressure, temperature and wellhead inlet flow parameters while drilling, the change of the downhole annular return flow rate is monitored, so as to achieve the purpose of monitoring early overflow. Background technique [0002] As the exploration and development of my country's oil and gas resources continue to deepen, it has developed from conventional oil reservoirs to hidden oil reservoirs and complex oil reservoirs, from shallow to deep, and from east to west and ocean. The drilling environment has become increasingly harsh and the difficulty of drilling has been increasing Large, complex and harsh working conditions have brought new wellbore pressure control problems, especially for high-pressure gas w...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of distortion and hysteresis of the monitoring results of the conventional monitoring method, make up for the shortcomings of the conventional monitoring method, and provide a device and method for monitoring the early overflow of the downhole annular flow rate measurement while drilling. The device can measure the flow rate, pressure, temperature and other parameters of the annulus near the drill bit downhole while drilling. The device can be connected with MWD (Measurement While Drilling) to upload real-time downhole measured data, and comprehensively analyze and process the downhole real-time uploaded data and ground-related data. , can judge downhole overflow in real time, so as to achieve the purpose of monitoring early overflow and effectively improve the safety of drilling well control

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