Analysis Behind Casing: A window for Improved Reservoir Management of Mature 
Bahrain Oil Field

Murty, C.R.K.; Zubari, Hisham; Srivatsava, Ashok; Ramamoorthy, Raghu; Rampurwala, Mansoor

doi:10.2523/93582-ms

Cited by 6 publications

(5 citation statements)

References 1 publication

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“…With measurement accuracy within 10%, error in the interpreted saturation is less than 5% and hence could be used for quantitative estimates. The accuracy is much better for the range of formation resistivities of interest 10 -40 oham-m [1,2,8]. Since the Cased-hole resistivity measurements investigate deeper into the formation and does not suffer from the restrictions of low salinity and porosity they are often advantageous over the hitherto popular time-elapse pulsed neutron techniques for reservoir monitoring.…”

Section: IIImentioning

confidence: 99%

“…However combination of both could be of great use in accurately describing the fluid type as well as lithology. Where Cased Hole Formation Resistivity Tool may not be feasible one would be necessary if the conditions are not favorable to record the other as in the case of a scaled casing [6][7][8][9].…”

Section: IIImentioning

confidence: 99%

“…The tool operates in the resistivity range of 1 -100Ωm (ohm-m), the lower limit imposed by the uncertainty in the cement resistivity and thickness (R Cement / R t high) and the upper limit determined by the signal strength as the leakage current would be feeble at high formation resistivities. Investigation of the tool is typically more than 2m in depth and is better than conventional latero tools but vertical resolution is about 4ft which is poor in comparison [1,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Exploration of Hidden Hydrocarbons in Old Wells Magid Field - Sirte Basin, Libya

Alfageh¹

2021

IJRASET

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It is increasingly important to improve field productivity in today's competitive market. One way to achieve this, is to add new wells which are expensive and time consuming. The other alternative is to identify bypassed hydrocarbons, track changes in saturations and detect movement of reservoir fluid contacts from existing well bores already in place. It is considerably more cost effective and often more environmentally friendly to explore for those hidden hydrocarbons in old wells rather than drill new wells. As the field matures, there is a need to reevaluate the formation in older reservoirs and to focus the development strategy and approach on bypassed oil pockets and depletion levels in producing intervals. The ability to acquire essential logging data behind casing adds a new dimension to cased hole formation evaluation for locating and evaluating potential hydrocarbon zones in a mature field as in Magid field. A basic petrophysical evaluation was performed incorporating the data recorded behind casing by applying {Cased Hole Formation Resistivity Logging (CHFRL)} in each of these wells. Based on the analysis of cased hole formation evaluation results. The un-depleted intervals were commercially exploited adding reserve to the asset. Keywards: Hydrocarbon zones, Majid Field, Sirte Basin, Libya, CHFRL

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Section: IIImentioning

confidence: 99%

Section: IIImentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exploration of Hidden Hydrocarbons in Old Wells Magid Field - Sirte Basin, Libya

Alfageh¹

2021

IJRASET

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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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“…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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Analysis Behind Casing: A window for Improved Reservoir Management of Mature Bahrain Oil Field

Cited by 6 publications

References 1 publication

Exploration of Hidden Hydrocarbons in Old Wells Magid Field - Sirte Basin, Libya

Exploration of Hidden Hydrocarbons in Old Wells Magid Field - Sirte Basin, Libya

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

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