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• W2312547866 abstract "Abstract Air hammer drilling technique has long been considered an effective approach to improve the rate of penetration (ROP) in hard formations. However, when being used in wet or water formations, air hammers are easy to output less energy or to be failure to work; in addition, the formation fluids would flow back into the gas chamber cylinder of air hammer when the gas circulation was stopped during the pipe connection time. In potential water formations, the operators would worry the possible failures of air hammers, thus quit the air hammer drilling technique and choose a comparatively safe drilling technique even with a lower ROP. A kind of foam hammers was developed. It is suitable for both dry gas and wet gas (misted gas or foam) drilling media with high energy output compared to the air hammers. Furthermore, with the installation of anti-backflow device, the foam hammer can effectively seal the formation fluids and prevent their backflow into the gas chambers of hammer. Two field tests were carried out. The lithology of the both cases’ targeting formations was hard rocks and the ROP was no more than 1.5 m/h in mud drilling. Air hammer drilling technique might be the best choice and the ROP might be increased by 5-10 times. However, due to the potential water strata contained, the operators had no confidence to employ air hammer drilling technique firstly. If the wet formations were encountered in advance with a short dry interval and needed to change to misted gas or foam drilling technology, an overwork of bit-change is needed and the short interval of gas drilling would not bring economical benefits. The foam hammer drilling technique can solve this problem. With the foam hammer, there was no need to trip out/in the BHA when changing into misted gas drilling or foam drilling due to the water formations. The results in two cases showed that the ROP of foam hammer in gas drilling medium was 5~10 times higher than traditional mud drilling, and the ROP in foam medium was 2~3 times higher than traditional mud drilling without reservoir fluids backflow into the hammer's gas chamber. With the foam hammer, the operators may firstly apply the gas drilling technique in dry formations. If the encountered strata contain water, they can immediately transformed into wet gas drilling medium such as misted gas or foam with no tripping out/in to change the bits. Thus, improve the drilling performance compared to air hammer drilling." @default.
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• W2312547866 date "2015-10-20" @default.
• W2312547866 modified "2023-09-23" @default.
• W2312547866 title "Foam Hammers Enhanced the Performance of Hammer Drilling in Potential Water Formations" @default.
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• W2312547866 doi "https://doi.org/10.2118/176418-ms" @default.
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