Hot dry rock formations are usually igneous rock with poor drillability and high temperature. Circulation loss, blowout, well kick and other drilling accidents occur frequently in hot dry rock drilling. Domestic well control techniques and equipment cannot meet the requirement of hot dry rock drilling. To satisfy the need of high-temperature well control and guarantee construction safety, this paper analyzes the relationship between the formation temperature, pressure and blowout and designs a high-speed rotary blowout preventer and control system with simple structure and high-temperature capacity, which can improve the drilling efficiency and reduce drilling risks.
ZHANG Delong
,
WENG Wei
,
JIA Jun
,
HUANG Yuwen
,
FENG Meigui
. Well control techniques in hot dry rock drilling[J]. Science & Technology Review, 2015
, 33(19)
: 45
-48
.
DOI: 10.3981/j.issn.1000-7857.2015.19.006
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