INCREASING WELL FASTENING BY APPLICATION OF CURING FOAMS
Increasing the support of the well is the creation of an artificial bridge in the borehole space of the well, filling voids in rocks (pores, cracks, cavities), fastening the structures of loosely bonded rocks and thereby contributing to the blockage of the channels of the drilling mud into the forma...
| Published in: | Bulletin of the Tomsk Polytechnic University Geo Assets Engineering |
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| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | Russian |
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Tomsk Polytechnic University
2022
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| Subjects: | |
| Online Access: | https://doi.org/10.18799/24131830/2022/4/3174 https://doaj.org/article/b00f8efda5064b46955acd7d07e8ef14 |
| Summary: | Increasing the support of the well is the creation of an artificial bridge in the borehole space of the well, filling voids in rocks (pores, cracks, cavities), fastening the structures of loosely bonded rocks and thereby contributing to the blockage of the channels of the drilling mud into the formation and preventing scree and collapses of unstable rocks. Composite materials of cured grouting foams, technology and conditions of their application are considered. In the proposed technology, it is supposed to drill on foams and transfer them to a solid state (foams) in complicated intervals of rocks, thereby clogging the channels of the drilling mud exit. Relevance. The development of the domestic geological exploration industry makes it very relevant to develop scientific approaches to the compositions of drilling fluids that allow drilling cycles with high mechanical speed and simultaneous padding of absorption zones in areas of low reservoir pressure. From these positions, the use of gas–liquid mixtures as a cleaning agent and grouting material is most relevant. The loss of drilling fluid in the well occurs due to the excess of the bottom-hole pressure over the reservoir. The absorption intensity is determined by the presence of open porosity of rocks, intense fracturing and cavities. The development of technologies to improve the integrity of the well walls and the borehole space, allowing the drilling process to be carried out on foams and in complicated intervals of rocks to transfer them to a solid state, while significantly increasing the well support, is a very significant task. The purpose of this article is to show the effectiveness of the use of foams in the well construction cycle when drilling on permafrost rocks, in circulation loss zones, in unstable and weakly cemented rocks (clay, sand, silt, soft clay shales). Curable foams with adjustable setting times allow you to increase the adhesion and strength of the grouting stone, create an impenetrable barrier when eliminating drilling mud losses. ... |
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