Looking Behind Casing: Evaluation and Application of Cased-Hole Resistivity in Saudi Arabia

Ma, Shouxiang; Al-Ajmi, Fahad; Al-Shahri, Ali M.; Al-Behair, A.

doi:10.2118/88467-ms

Cited by 11 publications

(3 citation statements)

References 6 publications

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“…In other instances the electrodes may make contact with the casing by scratching away the coating, meaning that the CHFR measurement would be unaffected but that corrosion may be induced. Dual casing strings: CHFR is not designed to operate in dual casing strings; the number of variables involved is too complex to enable the formation resistivity to be quantified [17][18][19][20][21].…”

Section: Chfr Limitationsmentioning

confidence: 99%

Hydrocarbon Potential Monitoring in Gas Sandstone Reservoir Using CHFR and TDT Techniques

Hamada

Hegazy²

2007

Proceedings of EUROPEC/EAGE Conference and Exhibition

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fax 01-972-952-9435. AbstractThe ability to detect and evaluate bypassed hydrocarbon and track fluid movement in sandstone reservoir is vital in the quest to improve production and increases recovery. The main technique, which has been used for monitoring reservoir saturations, is Thermal Decay Time (TDT) tool. But, it was hard to interpret the TDT data in the low formation water salinity reservoirs. This problem can not be solved because it is related to the theory itself of TDT measurement, which depends on salt content in formation brine. The problem of low formation water salinity was solved by Carbon Oxygen Ratio (COR) technique, which was latterly combined with TDT technique in the same tool, called reservoir Saturation Tool (RST) tool. This tool was not widely used due to its short depth of investigation (6-8 inches) in addition to its long logging time.A Technique called Cased Hole Formation Resistivity tool (CHFR) technique was proposed to overcome many of the pulsed neutrons tool limitations. Based on the actual CHFR logs recorded through wells studied in an oil field in Sinai, which are presented and discussed in the present work, a comparison study was done between the two available techniques, TDT and CHFR as methods for reservoir saturation monitoring, in addition to the results of open-hole resistivity logs as reference runs. It was found that water saturations calculated from CHFR logs were more accurate than TDT log in most of the cases, and that the quick look of CHFR logs always agrees with its quantitative interpretation, which gives the trust to relay on quick look of CHFR log, if a fast decision is required. While the quick look of TDT log was found to be very tricky, in most of the cases: often does not agree with its quantitative interpretation.

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Section: Chfr Limitationsmentioning

confidence: 99%

Hydrocarbon Potential Monitoring in Gas Sandstone Reservoir Using CHFR and TDT Techniques

Hamada

Hegazy²

2007

Proceedings of EUROPEC/EAGE Conference and Exhibition

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“…to operate in dual casing strings; the number of variables involved is too complex to enable the formation resistivity to be quantified [17][18][19][20][21].…”

Section: Dual Casing Strings: Chfr Is Not Designedmentioning

confidence: 99%

Cased-Hole Formation Resistivity (CHFR) Technique Improves Hydrocarbon Saturation Monitoring in Developed Reservoirs

Hamada¹

2006

Proceedings of SPE Eastern Regional Meeting

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TX 75083-3836 U.S.A., fax 01-972-952-9435. AbstractThe ability to detect and evaluate bypassed hydrocarbon and track fluid movement in sandstone reservoir is vital in the quest to improve production and increases recovery. The main technique, which has been used for monitoring reservoir saturations, is TDT tool. But, it was hard to interpret the TDT data in the low formation water salinity reservoirs. This SPE 104472Cased-Hole Formation Resistivity (CHFR) Technique Improves Hydrocarbon Saturation Monitoring in Developed Reservoirs G.M. Hamada, KFUPM cases, and that the quick look of CHFR logs always agrees with its quantitative interpretation, which gives the trust to relay on quick look of CHFR log, if a fast decision is required.1. Water saturations derived from CHFR log were more accurate than those from TDT log. Also, CHFR results were very representative to reservoirs of low formation water salinity, low porosity 2. TDT log gives water saturations greater than that given by CHFR log against same intervals. Therefore, Decisions of water shut-off operations based on TDT log, we will loss this difference of oil saturation, which means that large volumes of oil may be lost. Interpretation of CHFR log is easier than that ofTDT log because while interpretation of CHFR log, two factors which come from the same origin, are compared with each others. These two factors are open and cased-hole resistivities, so, it is easy to compare them and detect any differences between them. In the case of TDT log, two different factors are compared with each others; these factors are TDT sigma and open-hole resistivity that makes the comparison difficult and not realistic.4. In case of proper and successful water shut-off operations, the pay-out-time of CHFR log is less than that of TDT log, despite being much more expensive than TDT log. Therefore, if the using of CHFR log is mandatory (due to well conditions), it will be more economic than TDT log.

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“…10 It was tested and evaluated by Saudi Aramco in 2002 11 and, since then, has been used for cased-hole reservoir saturation monitoring in mature reservoirs in Saudi Arabia. 10 It was tested and evaluated by Saudi Aramco in 2002 11 and, since then, has been used for cased-hole reservoir saturation monitoring in mature reservoirs in Saudi Arabia.…”

Section: Cased-hole Reservoir Saturation Monitoringmentioning

confidence: 99%

Cased-Hole Reservoir Saturation Monitoring in Mixed Salinity Environments - A New Integrated Approach

Al-Hajari

Berberian

et al. 2005

Proceedings of SPE Middle East Oil and Gas Show and Conference

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Looking Behind Casing: Evaluation and Application of Cased-Hole Resistivity in Saudi Arabia

Cited by 11 publications

References 6 publications

Hydrocarbon Potential Monitoring in Gas Sandstone Reservoir Using CHFR and TDT Techniques

Hydrocarbon Potential Monitoring in Gas Sandstone Reservoir Using CHFR and TDT Techniques

Cased-Hole Formation Resistivity (CHFR) Technique Improves Hydrocarbon Saturation Monitoring in Developed Reservoirs

Cased-Hole Reservoir Saturation Monitoring in Mixed Salinity Environments - A New Integrated Approach

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