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### Correlation of Sonic Travel Time to the Uniaxial,

Sonic travel time logging of exploration boreholes is routinely used in Australia to obtain estimates of coal mine roof rock strength. Because sonic velocity logs are relatively inexpensive and easy to obtain during exploration, the technique has provided Australian underground coal mines with an abundance of strength data for use in all aspects of ground control design. However, theIn Situ Estimation of Roof Rock Strength using Sonic Logging,Queensland, Australia (after Payne, 2008). UCS data computed from sonic travel time log data, with black representing the 1weakest roof and light gray to white the strongest roof. Vertical scale 0 to 40 ft. Plot width approximately 8000 ft. 2. Sonic logging tools Sonic logging tools contain one or more transmitters which generatePrediction of Rock Strength using Drilling Data and Sonic Logs,The calculations of uniaxial Compressive Strength (UCS) are based on a simplified version of the ROP model proposed for tricone bits. The purpose of this research was to predict the uniaxial compressive strength based on sonic logs as a function of sonic travel and

### Correlation of Sonic Travel Time to the Uniaxial,

01.01.2008· Sonic travel time logging of exploration boreholes is routinely used in Australia to obtain estimates of coal mine roof rock strength. Because sonic velocity logs are relatively inexpensive and easy to obtain during exploration, the technique has provided Australian underground coal mines with an abundance of strength data for use in all aspects of ground control design.In situ estimation of roof rock strength using sonic logging,01.09.2010· The ability to use sonic logs to estimate rock strength provides the US coal industry with a powerful new tool for improving ground control design. The availability of uniaxial compressive strength data is essential to effective roof support selection, gate entry design, and many other aspects of ground control. Widespread use of sonic logs during the exploration phase could vastly increase the quantityIn situ estimation of roof rock strength using sonic logging,04.12.2020· The UCS estimated from sonic logs is one of the most widely utilized geotechnical parameters in the Australian coal mining industry, typically for

### Prediction of Rock Strength using Drilling Data and Sonic

The calculations of uniaxial Compressive Strength (UCS) are based on a simplified version of the ROP model proposed for tricone bits. The purpose of this research was to predict the uniaxial compressive strength based on sonic logs as a function of sonic travel and formation porosity. For obtaining continuous log strength along the wellbore in Ahwaz oilfield, quantitative relationships were,A log based analysis to estimate mechanical properties and,,parameters and rock strength [3]. The sonic log is used to develop dynamic rock properties which are then converted to static properties when calibrated against results from triaxial and uniaxial tests on core sample. These static elastic properties can then be further developed to develop rock strength properties and a safe mud weight windowOil well compressive strength analysis from sonic log; a,,The acquisition of rock strength along the wellbore can be obtained from various sources such as logs, cutting and rock mechanical test or drilling data. This paper posed a trial to obtain compressive strength profile of oilfield's formation from a sonic log. According to the results, the formations have been divided into several groups from very soft to very hard formation to optimize bit selection. The acquisition of rock strength

### Christopher MARK | Principal Roof Control Specialist | PhD,

The uniaxial compressive strength (UCS) is the most fundamental measurement used in geotechnical rock characterization for mine design. While there are standardized procedures for how to conduct,In situ estimation of roof rock strength using sonic,01.09.2010· The ability to use sonic logs to estimate rock strength provides the US coal industry with a powerful new tool for improving ground control design. The availability of uniaxial compressive strength data is essential to effective roof support selection, gate entry design, and many other aspects of ground control. Widespread use of sonic logs during the exploration phase could vastly increase the quantityCorrelation of Sonic Travel Time to the Uniaxial,,01.01.2008· Sonic travel time logging of exploration boreholes is routinely used in Australia to obtain estimates of coal mine roof rock strength. Because sonic velocity logs are relatively inexpensive and easy to obtain during exploration, the technique has provided Australian underground coal mines with an abundance of strength data for use in all aspects of ground control design. However, the technique depends upon reliable correlations between the unconfined compressive strength (UCS) and the sonic,

### Prediction of Rock Strength using Drilling Data and

The calculations of uniaxial Compressive Strength (UCS) are based on a simplified version of the ROP model proposed for tricone bits. The purpose of this research was to predict the uniaxial compressive strength based on sonic logs as a function of sonic travel and formation porosity. For obtaining continuous log strength along the wellbore in Ahwaz oilfield, quantitative relationships were developed between UCS and sonic travel time as well as UCS and both of sonicEstimation of rock uniaxial compressive strength for an,,01.12.2018· The interpreted density and sonic logs data are used for estimation of elastic moduli and the fourth and most important parameter UCS. The main parameter which should be considered before conducting any study on well logging parameters is quality control. Firstly, any data should be controlled in terms of depth mismatch. To do depth control one lithology marker, like the gamma ray log, should be selected, and other logsPrediction of Uniaxial Compressive Strength of,18.04.2014· In this study, one of the Iranian oil fields was selected to be analyzed. The goal was calculating the compressive strength from sonic log parameters. In order to develop an exponential correlation, log, drilling data, and backward simulation were used. Log data included sonic, neutron, density, and gamma ray logs. The correlation developed is applicable to determine the quantity of compressive strength of underground formations

### Prediction of Uniaxial Compressive Strength from well log,

Prediction of Uniaxial Compressive Strength from well log data 110°C for 24 hours. All the samples are subjected to load at a constant stress rate (0.5 MPa/sec) such that failure willAssessing Rock Compressive Strength and Predicting,,is based on Compressive Strength using Sonic, Gamma & Density logs. Digitized value of compressional travel time, gamma ray log and bulk density are put in formulae to find the compressive strength of these formations (Fig. 3) and plotted against depth as shown in Fig. 4 & 5. This plot is then used to select a suitable bit for any desired interval.Rock strength from log parameters - PetroWiki,25.06.2015· Fig. 1 – Strength analysis applied to a Gulf of Mexico suite of logs. Sand/shale fraction is derived from gamma ray and SP logs (left track). Porosity is extracted from the density log (see previous sections). Uniaxial compressive strength is derived from using Eq. 13.153. Weaker sands can be identified and failure predicted based on in-situ stresses around a borehole and a particular production

### Christopher MARK | Principal Roof Control Specialist | PhD,

The uniaxial compressive strength (UCS) is the most fundamental measurement used in geotechnical rock characterization for mine design. While there are standardized procedures for how to conduct,Crain's Petrophysical Handbook | Calculating Mechanical,,ROCK STRENGTH The static Young’s modulus is used to get the static uniaxial compressive strength (STRc). 1: STRc = (3 + 4.1 * Yst) * 145 Where, Yst = static Young’s modulus (psi) STRc = uniaxial compressive strength (psi) The tensile strength (STRt) is obtained from the UCS by 2: STRt = KST1 * STRc Where: KST1 = 0.08 to 0.10Correlation of Sonic Travel Time to the Uniaxial,,01.01.2008· Sonic travel time logging of exploration boreholes is routinely used in Australia to obtain estimates of coal mine roof rock strength. Because sonic velocity logs are relatively inexpensive and easy to obtain during exploration, the technique has provided Australian underground coal mines with an abundance of strength data for use in all aspects of ground control design. However, the technique

### Prediction of Rock Strength using Drilling Data and

The calculations of uniaxial Compressive Strength (UCS) are based on a simplified version of the ROP model proposed for tricone bits. The purpose of this research was to predict the uniaxial compressive strength based on sonic logs as a function of sonic travel and formation porosity. For obtaining continuous log strength along the wellbore in Ahwaz oilfield, quantitative relationships were developedEstimation of coal measures rock strength using sonic,Downhole geophysical logs, particularly neutron-neutron and sonic, have been used for estimating overburden strength at ten mine sites in Australia. The results are used in formulating specifications for numerical and physical models of coal extraction, which are in turn used for selecting pillar and roadway dimensions. Empirical relationships for estimating uniaxial compressive strength (UCS,Estimation of coal measures rock strength using sonic and,,01.11.1987· Uniaxial compressive strengths tend to be mainly in the range 60-90 MPa ( Figs. 7 and 8 ), but very strong ( though thin ) sandstone beds of 120-180 MPa are common. Sonic logs indicate that bedding plane fractures are much less common at Liddell (based on the lack of cycle skipping on the raw data channel ). Strength/log response relationships derived from regression analyses of data from two

### Estimation of rock strength from sonic log for Buzurgan,

In this study, utilizing sonic log data from (Bu-50) and (BU-47) wells at Buzurgan oil field. Five formations have been studied (Mishrif, Sadia, Middle lower Kirkuk, Upper Kirkuk, and Jaddala) Firstly, calculated unconfined compressive strength (UCS) for each formation, using a sonic log method. Then, the derived confined compressive rock strengthens from (UCS) by entering theWell Collapse Modelling And Application Of Two WorkFlows,,application of density log derived uniaxial compressive strength (UCS) used for collapse strength determination. The presented workflows are tested on Heidrun well program. The results are compared with sonic log derived methods. The results illustrate the potential application of the presented workflows. 1 INTRODUCTIONAssessing Rock Compressive Strength and Predicting,,is based on Compressive Strength using Sonic, Gamma & Density logs. Digitized value of compressional travel time, gamma ray log and bulk density are put in formulae to find the compressive strength of these formations (Fig. 3) and plotted against depth as shown in Fig. 4 & 5. This plot is then used to select a suitable bit for any desired interval.

### Analysis of stress variations with depth in the Permian,

The Uniaxial Compressive Strength (C o) is a critical parameter to constrain maximum horizontal stress if there are no drilling-induced tensile fractures, which is the case in the Wolfcamp formation (Fig. 10). One well-studied way to estimate C o is to relate C o to Young’s modulus (E) and derive E from sonic logs [7]. 3.1. Fitted relation between C(PDF) ESTIMATING UNIAXIAL COMPRESSIVE,The uniaxial compressive strength test, however, is a destructive testing, which makes it a disadvantage to be conducted under the condition of a limited rock samples. UCS test also requires an extensive and expensive laboratory testing, and is often substituted for indirect laboratory testing methods which is more convenient to be conducted with limited time and rock samples. There are,Empirical relations between ultrasonic P-wave velocity,,The uniaxial compressive strength (UCS) is perhaps the simplest measure of the compressive strength of rock. It is determined by simply applying an increasing compressive stress σ parallel to the axis of a cylindrical core sample until it fails catastrophically. Often, the axial and radial strains are measured at the same time and these allow for estimation of Young’s modulus

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