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| RESEARCH ON GEOTRESS MEASUREMENT USING DRA-KAISER METHOD IN SALT-GYPSUM FORMATION |
| GE Weifeng1，ZHANG Fei2，CHEN Mian3，JIN Yan3， LU Yunhu3，HOU Bing3 |
(1. CNOOC EnerTech-Safety and Environmental Protection Co.，Tianjin 300456，China；2. Tianjin Branch，China National Petroleum Offshore Engineering Co.，Ltd.，Tianjin 300451，China；3. State Key Laboratory of Petroleum
Resources and Prospecting，China University of Petroleum，Beijing 102249，China) |
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Abstract Currently，existing geostress measurement methods are not suitable for salt-gypsum formation，while it needs geostress data to do drilling design for ensuring drilling safety in salt-gypsum formation. To alleviate this problem，geostress of rock salt-gypsum for the first time by DRA-Kaiser method is measured. It indicates that combining DRA and Kaiser method could increase the credibility of test data. When the stress-strain difference curve displays inflection point，and stress-acoustic emission intensity curve has significantly increased point，the stress which corresponds to axial compression is the stress that rock suffered. It avoids displaying several Kaiser points in previous Kaiser effect experiments.
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2015, Vol. 34 
