Simulating borehole ballooning helps ensure safe drilling of deep-water oil, gas

Simulating borehole ballooning helps ensure safe drilling of deep-water oil, gas
Schematic diagram of the borehole ballooning experimental device. Credit: Reyu Gao

A device which simulates borehole ballooning, a detrimental side effect of deep-water drilling operations, is expected to ensure safe and efficient operations. If not prevented, borehole ballooning can lead to irreversible damage and serious drilling accidents, which can result in reservoir pollution and huge economic loss.

In a recent issue of the Review of Scientific Instruments, researchers from the China University of Petroleum-Beijing present a device that can simulate this dangerous phenomenon in the hopes of preventing it.

"In order to promote the development of drilling technology and ensure the safe and efficient exploitation of deep-water oil and gas, we have conducted research on the problems encountered in deep-water drilling processes, and the ballooning is one of them," said author Reyu Gao.

Borehole ballooning is reversible mud gains and losses to the wellbore that occur during . Increased understanding and data on the phenomenon can help scientists develop preventative response measures to counteract it.

Unlike previous research, which largely focused on numerical modeling, the authors' research included experimental results.

"Most research into borehole ballooning has been theoretical, with few experiments," said Gao. "Our device is the first professional device capable of simulating and studying the borehole ballooning under different conditions."

The device, which is made up of four individual units, can simulate conditions like different fracture opening pressures, rock types, and mud circulation pressures. Its sections include the displacement unit, the triaxial clamping unit, the back-pressure unit, and the control and data acquisition system.

"According to the current research, the main mechanism causing borehole ballooning is the opening and closing of the fracture network around the wellbore caused by wellbore pressure fluctuations. Therefore, based on this mechanism, we first designed the core unit of the device, the triaxial clamping unit, which can simulate the opening and closing of fractures," said Gao.

The researchers proved their device was able to accurately simulate the effects of borehole ballooning through experiments, and they expect these experiments to be able to validate on the topic.


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More information: "An innovative experimental device for borehole ballooning," Review of Scientific Instruments (2020). aip.scitation.org/doi/10.1063/1.5139950
Journal information: Review of Scientific Instruments

Citation: Simulating borehole ballooning helps ensure safe drilling of deep-water oil, gas (2020, April 28) retrieved 2 July 2020 from https://phys.org/news/2020-04-simulating-borehole-ballooning-safe-drilling.html
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