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  • Séances, réunions, journées parrainées ou organisées par la SGF

    Séances, réunions, journées parrainées ou organisées par la SGF

Calendrier des évènements SGF

Séances, réunions, journées : le calendrier des manifestations scientifiques

La Société géologique de France organise et parraine chaque année des réunions scientifiques & techniques. Elle  annonce également les manifestations scientifiques organisées par ses associations partenaires, celles des institutions internationales auxquelles elle est liée, ainsi que les réunions des associations avec lesquelles elle a signé un protocole d'accord :

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Réunion Technique de la SPWLA France Chapter : Behind Casing Evaluation and Interpretation

Réunion Technique de la SPWLA France Chapter : Behind Casing Evaluation and Interpretation
Date : 11/03/2022
Date de fin : 11/03/2022
Heure : 12:00 à 14:00
Manifestation organisée par une association partenaire à la SGF

SPWLA France Chapter
Section française de la SPWLA “Behind Casing Evaluation and Interpretation



Webinar Lunch & Learn technical session with 2 presentations on  “ Behind Casing Evaluation and Interpretation”


Date : Friday, March 11, 2022

Time : 12:00 pm – 2:00 pm (UTC +01:00 Paris)



Speaker : Qinshan Yang (GOWell International)

Abstract: Casing deformation and tubing eccentricity is a concern in the oil and gas industry for safety and operational reasons. Casing deformation or tubing eccentricity originates from various sources such as well completion, corrosion, formation swelling, collapse, salt dome creep, etc. It is important to implement a well-integrity surveillance program covering all of the casing and tubing strings for the full well life-cycle from initial completion to abandonment. However, there has been no effective logging method to evaluate though-tubing the condition of the casing string for deformation and eccentricity. This paper describes a new Deformation-and Eccentricity (DEC) tool which is based on electromagnetic technology and designed to measure casing deformation and tubing eccentricity while logging inside completion tubing. The DEC tool generates a unique compressed-and-focused magnetic field which provides increased Signal-to-Noise Ratio (SNR) and employs an array of magnetic sensors to measure the magnetic flux density distributions azimuthally around the tool. The tool’s compressed-and-focused magnetic field is designed to (1) saturate the magnetic flux of the tubing and (2) inject more magnetic flux into the first casing behind the tubing, (3) to increase signal measurement sensitivity and SNR. The sensor matrix measures flux density changes which correspond to variations in distance between tubing and casing. The high resolution azimuthal magnetic sensor matrix delivers high accuracy measurements, which are used to image the flux density changes. A finite element based forward modeling and an optimized Gaussian Processes Regression method has been developed to process the raw logging data. DEC has a built-in orientation measurement based on gyro and accelerometers that are used to align the deformation and eccentricity images and index curves, as well as the tubing thickness image. The tool specifications as 1% of eccentricity ratio and 5% of deformation ratio accuracy in the range of casing OD up to 13-3/8”. DEC technology provides an advanced answer product for through-tubing casing deformation and eccentricity measurements in downhole well-integrity and plugabandonment applications. When combined with other well-integrity measurements such as multi-finger caliper and multi-pipe thickness log tool a complete well integrity evaluation can be achieved throughout the life cycle of a well. For example, significant casing deformation can often indicate the potentially damaged cement behind the casing. Other applications for the technology include tubing clamp location for fiber-optics cables and control lines, and the orientation of multistring tubing completions, etc. Performances of the tool have been validated through research simulations, lab tests, and field trials. The paper includes a field case study of a deviated gas production well with tubing buckling and casing micro-dogleg.

About the Presenter :

QinShan Yang serves as a Senior Advisor at GOWell. Dr. Yang has more than eighteen years of experience in the industry. He has worked in various positions for Schlumberger, CNPC, UT Austin, and now at GOWell. Currently, he is the leader and advisor in the field of well integrity, Acoustic/EM tool physics, and DAS/DTS projects. He has published more than twenty technical papers and holds twelve patents. Dr. Yang received Ph.D. degree from the Chinese Academy of Science and his postdoctoral study on the formation evaluation and unconventional reservoir from The University of Texas at Austin. Dr. Yang is an active SPWLA, SPE, and SEG member and involved in volunteering activi



Speaker : Laurent Mosse (Schlumberger)

Abstract: Growth in the coal seam gas industry in Queensland, Australia, has been rapid over the past fifteen years, with greater than USD 70 billion invested in three liquified natural gas export projects supplied by produced coal seam gas. Annual production is of the order of 40 Bscm or 1,500 PJ, with approximately 80% of this coming from the Jurassic Walloon Coal Measures of the Surat Basin and 20% from Permian coal measures of the Bowen Basin. The Walloon Coal Measures are characterized by multiple thin coal seams making up approximately 10% of the total thickness of the unit. A typical well intersects 10 to 20 m of net coal over a 200 to 300 m interval, interbedded with lithicrich sandstones, siltstones, and carbonaceous mudstones. The presence of such a significant section of lithic interburden within the primary production section has led to a somewhat unusual completion strategy. To maximize connection to the gas-bearing coals, uncemented slotted liners are used; however, this leaves fluid-sensitive interburden exposed to drilling, completion, and produced formation fluids over the life of a well. External swellable packers and blank joints are therefore used to isolate larger intervals of interburden and hence minimize fines production. Despite these efforts, significant fines production still occurs, which leads to failure of artificial lift systems and the need for expensive workovers or lost wells. Fines production has major economic implications, with anecdotal reports suggesting up to 40% of progressive cavity pump artificial lift systems in Walloon Coal Measures producers may be down at any one time. The first step in solving this problem is to identify the extent and distribution of fines production. The wellbore completion strategy above, however, precludes use of mechanical calipers to identify fines production-related wellbore enlargement. A new caliper-behind-liner technique has therefore been developed using a multipledetector density tool. Data from the shorter spacing detectors is used to characterize the properties of the liner as well as the density of the annular material. This is particularly important to evaluate as the annulus fill varies between gas, formation water, drilling and completion fluids, and accumulated fines. The longer spacing detector measurements are then used in conjunction with pre-existing open-hole formation density measurement to determine the thickness of the annulus, and hence hole size, compensating for liner and annulus properties. This methodology has been applied to several wells completed in the Walloon Coal Measures. Results have demonstrated the ability to identify zones of borehole enlargement behind slotted liner, as well as intervals of either gas or fines accumulation in the annulus. In addition, the technique has been successful in verifying the placement ofswellable packers and their integrity. The application of this solution has been used to drive improvements in the design of in-wellbore completion programs and in the future will help drive recompletion decisions and trigger proactive workovers.

About the Presenter :

Laurent Mossé is the technical director of petrophysics for Schlumberger Reservoir Performance Evaluation. After working at CERN in Geneva and obtaining a PhD in fundamental physics from the French Nuclear Agency (CEA), he worked 9 years as physicist and technical leader on R&D projects in a Schlumberger engineering center in France (including Platform Express integrated wireline logging tool and the Dielectric Scanner multifrequency dielectric dispersion service projects). Laurent then focused on multi-physics interpretation as a petrophysics domain champion, spending 9 years in various positions in Latin America, Middle East, Asia, and Europe. Laurent is coauthor of 30+ papers and holds several patents in the oilfield industry.


Registration :

To attend the session , if you are not member of affiliated member of SPWLA France chapter,  first register as member or at least Affiliated member ( no cost ) via 


then “sign up”   or directly on



Please register ( free) for SPWLA France Chapter Lunch and Learn on March 11, 2022 12:00 pm – 2:00 pm (UTC +01:00 Paris) at:


After registering, you will receive a confirmation email containing information to join the webinar.

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