Plugging evaluation device and method

Abstract

The invention provides a leaking stoppage evaluation device. The leaking stoppage evaluation device comprises a simulated formation mechanism, a simulated wellbore mechanism, a liquid inlet channel, a circulating channel and a measuring device. The simulated formation mechanism is provided with an inner cavity storing a leakage module. The simulated wellbore mechanism is provided with an input channel which extends vertically and a reflux channel which communicates with the bottom of the input channel. The reflux channel communicates with the inner cavity. The liquid inlet channel communicates with the input channel to input leaking stoppage slurry with preset temperature into the input channel. The leaking stoppage slurry is used for sealing and plugging the leakage module. The circulating channel communicates with the reflux channel and the liquid inlet channel. The circulating channel is provided with a first pump to make the leaking stoppage slurry flow circularly in the reflux channel, the circulating channel and the liquid inlet channel. The measuring device communicates with the inner cavity and is used for measuring weight of the flown leaking stoppage slurry of the leakage module after the leakage module is sealed and plugged. In addition, the invention further provides a leaking stoppage evaluation method, and the leaking stoppage evaluation method can simulate a dynamic leaking stoppage process and a static leaking stoppage process.

Description

technical field [0001] The application belongs to the technical field of petroleum exploitation, and in particular relates to a leakage plugging evaluation device and method. Background technique [0002] Loss of circulation usually refers to the direct entry of various working fluids (including drilling fluid, cement slurry, completion fluid and other fluids) into the formation under the action of pressure difference during downhole operations such as drilling, cementing, testing or workover. A kind of downhole complication. Lost circulation has always been a difficult problem in the drilling industry. With the development of drilling technology, lost circulation technology is also constantly developing. However, due to the uncertainty of the location of the underground leakage layer and the uncertainty of the leakage channel, sometimes the success rate of plugging is low. The imperfection of the indoor evaluation device is also a key problem that restricts the developmen...

AI Technical Summary

Problems solved by technology

Although this patent can simulate the flow state of the plugging slurry on site, the annular core of the evaluation device needs to be set in the peripheral wall of the outer sleeve. When placing and taking out the core in this way, the operation process is complicated and difficult to implement

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