Mehrabi Mazidi, S.
(Department of Structural and Engineering Geology, School of Geology, College of Science, University of Tehran, Iran)
,
Haftani, M.
,
Bohloli, B.
,
Cheshomi, A.
Uniaxial compressive strength of intact rock is an important mechanical parameter required for the design of geotechnical, mining engineering and petroleum reservoir projects. In geotechnical and mining projects, rock cores are usually available to be tested for such purposes. In the pet...
Uniaxial compressive strength of intact rock is an important mechanical parameter required for the design of geotechnical, mining engineering and petroleum reservoir projects. In geotechnical and mining projects, rock cores are usually available to be tested for such purposes. In the petroleum reservoirs, however, the extreme high cost and time-consuming of coring operation is a main issue and thus, rock core for mechanical destructive testing are rarely available. In this study, a new technique is proposed for measuring the uniaxial compressive strength of reconstructed cores from rock cuttings. For this purpose, a total of 23 blocks of limestone having different densities including Asmari and Sarvak Formations from Western part of Iran and also Cretaceous limestone from Northern part of the country were used. After preparing appropriate cores from the blocks, uniaxial compressive strength test was performed on rock cores. Next, rock cuttings were produced from the same blocks and were reconstructed into artificial cylindrical specimens. The size of the rock cuttings varied between 0.075mm and 0.4mm, since it proved promising in preparing specimens with a maximum density of about 80% of the intact rock. Thus, cylindrical specimens with the diameter of 38mm and the length of 76mm were built from the cuttings using standard compaction test. Cores with the same dimensions were taken from the same rock blocks. The two sets of samples were next subjected to the uniaxial compression test. Results showed an acceptable relationship between uniaxial compressive strength (UCS) of rock cores and the unconfined compressive strength of reconstructed cores (qu). A correlation coefficient of about or higher than 0.85 was obtained between UCS and qu for all samples tested. The proposed method can be used for determining the UCS of rocks whenever no cores are available.
Uniaxial compressive strength of intact rock is an important mechanical parameter required for the design of geotechnical, mining engineering and petroleum reservoir projects. In geotechnical and mining projects, rock cores are usually available to be tested for such purposes. In the petroleum reservoirs, however, the extreme high cost and time-consuming of coring operation is a main issue and thus, rock core for mechanical destructive testing are rarely available. In this study, a new technique is proposed for measuring the uniaxial compressive strength of reconstructed cores from rock cuttings. For this purpose, a total of 23 blocks of limestone having different densities including Asmari and Sarvak Formations from Western part of Iran and also Cretaceous limestone from Northern part of the country were used. After preparing appropriate cores from the blocks, uniaxial compressive strength test was performed on rock cores. Next, rock cuttings were produced from the same blocks and were reconstructed into artificial cylindrical specimens. The size of the rock cuttings varied between 0.075mm and 0.4mm, since it proved promising in preparing specimens with a maximum density of about 80% of the intact rock. Thus, cylindrical specimens with the diameter of 38mm and the length of 76mm were built from the cuttings using standard compaction test. Cores with the same dimensions were taken from the same rock blocks. The two sets of samples were next subjected to the uniaxial compression test. Results showed an acceptable relationship between uniaxial compressive strength (UCS) of rock cores and the unconfined compressive strength of reconstructed cores (qu). A correlation coefficient of about or higher than 0.85 was obtained between UCS and qu for all samples tested. The proposed method can be used for determining the UCS of rocks whenever no cores are available.
American Society for Testing, Materials 1981 Standard Test Method for Unconfined Compressive Strength of Cohesive Soil. ASTM D2166-85
American Society for Testing, Materials 1984 Standard Test Method for Unconfined Compressive Strength of Intact Rock Core Specimens. ASTM D2938
American Society for the Testing of Materials 2003 Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400ft-lbf/ft3 (600kN-m/m3)). ASTM D698
J. Pet. Sci. Eng. Chang 51 223 2006 10.1016/j.petrol.2006.01.003 Empirical relations between rock strength and physical
Rock Mech. Rock Eng. Fener 38 4 329 2005 10.1007/s00603-005-0061-8 A comparative evaluation of indirect methods to estimate the compressive strength of rocks
Jaramillo, R.A., 2004. Estudio geomecánico estadístico de l'estabilidad durante la perforación de pozos en el Piedemonte Llanero, campo Recetor. Tesis profesional Fac. Minas., Universidad Nacional de Colombia. Medellín, Colombia.
Bull. Eng. Geol. Environ. Kilic 67 237 2008 10.1007/s10064-008-0128-3 Determination of mechanical properties of rocks using simple methods
Mehrabi Mazidi, S., 2010. Determination of uniaxial compressive strength some of the limestones using the rock cuttings. M.Sc. thesis, School of Geology, University of Tehran.
Mehrabi Mazidi 2011 7th Iranian Conference of Engineering Geology and Environment, Shahroud, Iran Determination of uniaxial compressive strength some of intact limestone using reconstructed cores from rock cuttings
Santarelli 779 1989 Rock at Great Depth Determination of the mechanical properties of deep reservoir sandstones to assess the likelihood of sand production
Santarelli 1996 SPE, Proc. Eur. Petrol. Conf., Milano Formation evaluation from logging on cuttings
Int. J. Rock Mech. Min. Sci. Zoback 40 1049 2003 10.1016/j.ijrmms.2003.07.001 Determination of stress orientation and magnitude in deep wells
AI-Helper
※ AI-Helper는 부적절한 답변을 할 수 있습니다.