Overwater wellhead riser internal liquid level monitoring device and use method thereof

Abstract

The invention relates to an overwater wellhead riser internal liquid level monitoring device and a use method thereof. The liquid level monitoring device is characterized by comprising a base, rotating shafts, sensor rocker arms, laser sensors, air cylinders and a computer; the base is fixedly arranged in a gap located between a rotating disk surface located above a riser and a diverter; a throughhole allowing a drilling tool to extend in is formed in the center of the base; a plurality of the rotating shafts, the sensor rocker arms and the air cylinders are arranged at the top of the base ina spaced manner; each rotating shaft is fixedly connected with the output end of the corresponding air cylinder; one end of each sensor rocker arm is fixedly connected with the corresponding rotatingshaft; one laser sensor for acquiring riser internal liquid level signals is arranged on each sensor rocker arm; each air cylinder and each laser sensor are electrically connected with the computer;and the computer is used for determining the riser internal liquid level and controlling work of the air cylinders according to the liquid level signals acquired by the laser sensors. The monitoring device is widely applicable in the technical field of oil drilling.

Description

technical field [0001] The invention relates to a liquid level monitoring device in a wellhead water riser on water and a method for using the same, belonging to the technical field of petroleum drilling. Background technique [0002] In the process of offshore oil development, well control safety has always been a key factor restricting the development of deepwater oil and gas, especially in deepwater drilling, due to complex factors such as narrow safety density window, carbonate reservoirs with developed fractures, and high-temperature and high-pressure formations. Well kick and lost circulation accidents are prone to occur during the drilling process, and even blowout accidents may occur. Compared with conventional shallow water drilling and land drilling, the blowout preventer is located in a low-temperature, high-pressure subsea environment, which makes deep-water well control more complicated. Early detection and early warning of well kick and lost circulation are ver...

AI Technical Summary

Problems solved by technology

[0003] The kick and lost circulation monitoring methods of deep-water drilling in the prior art include the following three types: 1) platform monitoring method, which is mainly based on the return situation of the platform mud circulation pool and the monitoring parameters of the wellhead. It is characterized in that it is easy to operate, It is more practical for the case of large overflow, but the monitoring precision and accuracy of this method are low, it cannot reflect the real situation at the bottom of the well, and the monitoring time lags behind seriously, which cannot meet the requirements of early overflow monitoring, which limits its use in Applications in Deepwater Drilling

2) The monitoring method of the seawater section. The vicinity of the seabed mud line is the best place to monitor the overflow of the seawater section. The performance change of the drilling fluid in the wellbore is monitored by sound waves, which is mainly used for gas intrusion monitoring. However, the difficulty of this method lies in the identification of characteristic signals , it is necessary to further study and improve the

3) The downhole monitoring while drilling method, the monitoring sensor is installed on the downhole drill string, and the downhole real-time monitoring is carried out by comparing the wellbore hydraulic calculation results of the bottom hole pressure and the PWD / LWD (pressure monitoring while drilling / logging while drilling) measurement values. However, this method is significantly affected by the interference of the measurement environment and the data transmission rate, and it cannot be used effectively in the working conditions such as shutdown and no drilling fluid return

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