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Real-time method for determining the porosity and water saturation of an underground formation using gas and mud logging data

a technology of underground formations and logging data, applied in seismology for waterlogging, borehole/well accessories, instruments, etc., can solve the problems of scepticism and inability to interpret gas and mud logging data in a quantitative way

Inactive Publication Date: 2014-12-25
REPSOL SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The invention provides a method for using gas and mud logging data to determine the porosity and water saturation of an underground formation while drilling a borehole. This is done by calculating the Perforability Index (PI) as the inverse of the Rate of Penetration (ROP) normalized, which is a mathematical correction of the mud logging parameters obtained while drilling. The method involves normalizing the methane data as a correction for variation in drilling parameters, plotting the data in a double logarithmic plot, and using the plots to determine the Gw baseline and PI baseline. The system can be a computer system or an external hardware connected to the computer system. The technical effect of the invention is to provide a reliable and accurate way to determine the porosity and water saturation of an underground formation while drilling a borehole.

Problems solved by technology

Interpretation of gas and mud logging data in a quantitative way is still far from simple.
In most of the cases the conclusions reached are generally viewed sceptically due to the uncertainties inherent to the acquisition of data.
While real time drilling data are used in a “quantitative” manner, mainly for well control, the real time gas data, due to its variability, are generally used only in a qualitative way, and the analyses performed are mainly restricted to the use of Pixler, Wetness, Balance, Character or equivalent ratios to try to determine the nature of the fluid.

Method used

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  • Real-time method for determining the porosity and water saturation of an underground formation using gas and mud logging data

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[0131]The case study presented herein correspond to well located in offshore, shallow water environment. The sedimentology sequence consists of Upper Cretaceous carbonate deposits. The well used in this study was drilled with synthetic oil base mud, in a hydrostatic pressure regime and in a Shaly-Sand sequence. All the inventions which have been mentioned in this document have been applied in realtime during the drilling operation using Mud log and gas data and porosity (PHI_ML) and water saturation (SW _GAS) were calculated. These results were matched by the water saturation and porosity calculated by petrophysical analysis of the wireline logs recorded after end of the drilling operation. PHI_LOG was calculated by calibrating PI with porosity (PHNDX) derived by petrophysical analysis of wireline log. The calibration was done drawing the RMA line and finding the equation between PI and porosity derived by petrophysical analysis of wireline log. Once the equation is known then poros...

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Abstract

Real-time method for determining the porosity and water saturation of an underground formation using gas and mud logging dataA method and a computer program product for determining the porosity (PHI) and water saturation (Sw) of an underground formation while drilling a borehole, using gas and mud logging data obtained while drilling.

Description

FIELD OF THE INVENTION[0001]The present invention refers to the field of determining the fluid content of underground earth formations. More specifically, the invention is related to a method and a computer program product for determining the porosity (PHI) and water saturation (Sw) of an underground formation while drilling a borehole using gas and mud logging data.BACKGROUND ART[0002]Interpretation of gas and mud logging data in a quantitative way is still far from simple. In most of the cases the conclusions reached are generally viewed sceptically due to the uncertainties inherent to the acquisition of data. The reputation of being an unreliable source of data with inconsistent results is quite well known. In recent years, many studies have been presented by Oil Companies showing the multiple uses of gas data in supporting the E-log analysis, geochemistry studies and reservoir behavior proving the added value of the mud logging data for early formation evaluation and fluid chara...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/003G01V1/50
Inventor BEDA, GIULIOTIWARY, DEVENDRA NATH
Owner REPSOL SA
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