Device and method for measuring return flow of L-shaped communicating pipe drilling liquid

Abstract

The invention relates to a device for measuring a return flow of L-shaped communicating pipe drilling liquid and a method for measuring a return flow of L-shaped communicating pipe drilling liquid. The device for measuring a return flow of L-shaped communicating pipe drilling liquid consists of an optical liquid level sensor, an L-shaped communicating pipe, a flare pipe, a communication pipe bracket, a signal conditioning and pre-processing device, a data acquiring unit, a client computer and a sound and light alarm device, wherein the pipeline of the flare pipe is provided with an L-shaped communicating pipe; the L-shaped communicating pipe and the flare pipe form a communicating vessel; the vertical position of the window of the L-shaped communicating pipe is positioned between a pipeline flange plate of the flare pipe and the lower edge of a return pipeline; the circumferential direction of the window of the L-shaped communicating pipe anticlockwise rotate between the extended lines of the return pipeline central line from the intersecting line of the return pipeline and the pipeline of the flare pipe; and the optical liquid level sensor is arranged on the L-shaped communicating pipe bracket. In the invention, the pre-warning time is early; the detection precision is high; workers at the drilling site have more sufficient time to close the well; and blowout accidents are effectively prevented.

Description

1. Technical field: [0001] The invention relates to a rapid overflow identification technology in the field of oil and gas drilling detection while drilling, in particular to an L-shaped connecting pipe drilling fluid return flow measuring device and a measuring method thereof. Two, background technology: [0002] During the drilling of oil and gas resources, if the formation pressure is greater than the drilling fluid pressure in the well, formation fluid will invade the wellbore, which is called overflow. If it is not handled properly, it will lead to blowout or even loss of control, resulting in vicious safety accidents. The key to preventing blowout is to detect overflow in time. The earlier the overflow is found, the smaller the overflow, the less difficult it is to deal with the overflow, and the lower the probability of blowout. Accurate early warning, timely shutdown, and re-establishment of pressure balance. [0003] The wellhead blowout prevention equipment relate...

AI Technical Summary

Problems solved by technology

[0016] One object of the present invention is to provide a kind of L-type connecting pipe drilling fluid return flow measuring device, another object of the present invention is to provide the measurement method of this L-shaped connecting pipe drilling fluid return flow measuring device, it is used to solve The existing drilling fluid return flow rate cannot be accurately measured at the wellhead position, and the rapid identification of overflow by the flow difference method can be realized on conventional drilling rigs

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