Objetivo
The object of the project is to develop methods allowing to obtain geophysical data on the nature of the terrains between different wells within a same field. The aim is to improve our knowledge on the reservoir layer with the help of methods complementing those already existing and which are generally implemented from the surface, such as seismics or electric methods or which are implemented directly in the wells and presenting a limited investigation range, such as logs.
The implementation of new methods in wells would provide, at any point of the reservoir located between these wells, significant and thorough data allowing:
- a better static comprehension of the field :
new structural definition, location and identification of accidents (faults, reefs, etc. . . ), facies variations, etc. . .
- to obtain data on the dynamic behaviour of the reservoir : preferential drains, water inlets, evolution of contacts between fluids.
SEISMIC METHOD
- by transparency : development, adaptations and tests on synthetic data of three 2D or 3D inversion programs (collaboration IFP, SNEA( P), IRIGM).
- by reflection : familiarize with this type of information thanks to an important volume of synthetic data modelling a complete acquisition between two wells. Utilisation of the latter for special classification, in processing softwares adapted to the seismic profiles of wells with offset.
Continuation of the modelling for the integration of the tube wave phenomena in the transmitting wells and their interaction with the volume waves (mechanism which proved preponderant).
- guided waves : different configurations showing the theoretical interest of such an approach have been modelled (reservoirs presenting faults, or compartments with slow or rapid speed anomaly ).
- acquisition : an important measurement program with the help of four different well sources, on two different sites. Recording was executed with a conventional 3-component sonde and a wide band 48 -channel vertical streamer specially developed for this project. The various sources that have been tested are successfully : the shear gun of CPGF, the weight drop on the packer of IFP, the explosive and the sparker of SWRI. Recorded signals have a path band of 500 to 1000 Hz.
As far as the first acquisitions are concerned, the signal to noise ratio is variable and the sensitivity of the streamer has had to be improved (bottom preamplification).
A new test site with wells distant of 450 m has been chosen, so to transpose the results obtained in 1986 on to a more realistic frame. But it was impossible to record any data (problems of source and noise level in the wells).
- processing : ongoing.
These are difficult owing to the low signal to noise ratio of the recorded signals particularly with the well streamer.
The elimination of tube waves, a stack coverage and a PSO treatment allows to recover a field of reflected waves.
After migration,the obtained image presents a space resolution of about 1 metre. This is a very promising result. .
ELECTROMAGNETIC METHOD
- Theoretical and model studies have made it possible to conclude on a theoretical feasibility.
- Having proved that measures are possible across the tubing, the last studies showed that stability of the field response has no relation with the tubing.
- A prototype measuring chain is defined on paper.
Nevertheless, each field study will remain a particular application and a wide experience will be necessary to adapt the different choices with the raised problems (methods, acquisitions, processing ).
Two major types of methods are being studied :
- methods based on the propagation of acoustic waves between wells - methods based on the measurement of phenomena provoked like the electromagnetic measurements between two wells.
One of the particular features of the methodology envisaged within the scope of this project, resides in the integrated interpretation of results deriving from the different methods.
Last of all, the latter includes a feasibility phase and a study, execution and prototype testing phase.
SEISMIC METHOD
Three orientations have been followed, each corresponding to a different approach of the waves propagation phenomena in the reservoir environment :
- study by transparency :
while using travel time inversion techniques (first arrivals and selected reflections). The obtained result is a fine repartition of the geological speeds between wells. This technique, may, for example, evidence undetectable speed anomalies thanks to the knowledge of the media crossed ateach bore.
- study by reflection :
very high frequency seismics implemented between wells may lead to a very performing visual display of the reservoir. However, due to geometrical particularities at acquisition level, its processing is not yet mastered from the software standpoint. Thus, it is necessary that we prove our ability in emitting and recording seismic signals in a path band according to the objectives of the project, and that we finalize a processing method.
- study on guided propagation :
This phenomenon occurs when a number of conditions concerning speeds, geometry of layers, absence of heterogeneities, are respected. Here we are with an original research orientation which merits exploration (modelling).
ELECTROMAGNETIC METHODS
As the electric properties of a rock depend very closely on its fluids contents, this approach seems, on a conceptual level, paricularly suitable to evidence fluids and contacts between fluids.
However, the transposition of these methods, already used in surface geophysics, remains to be studied more thoroughly within a feasibility phase which is triple :
- study of the reservoir and of the possibilities of these methods ( modelling aspect, sensitivity, resolution force).
- drilling environment study
- technological study to draft a prototype pilot chain.
MEANS
All these different approaches mentioned above can only be studied, in a first step, through the modelling tools which will have to be designed or adapted, and can only be achieved once specific equipment will have been implemented in the wells. - seismic :
three different methods, but a single acquisition chain which should be very wide band (up to 500 to 1000 Hz), of rapid utilisation (important number of traces), non destructive at source level.
Ámbito científico (EuroSciVoc)
CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural. Véas: El vocabulario científico europeo..
CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural. Véas: El vocabulario científico europeo..
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Régimen de financiación (o «Tipo de acción») dentro de un programa con características comunes. Especifica: el alcance de lo que se financia; el porcentaje de reembolso; los criterios específicos de evaluación para optar a la financiación; y el uso de formas simplificadas de costes como los importes a tanto alzado.
Coordinador
92500 Rueil Malmaison
Francia
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