C&P: “Propped Height Validation in Liquids Rich Organic Shales using Recovery Factor Analysis”

Speaker Robert Barba
Bob spent 10 years with Schlumberger as an openhole field engineer, sales engineer, and product development manager. Since then he has spent 22 years consulting to over 175 companies on petrophysics and completion optimization. He has focused on the integration of petrophysics with completion designs in a variety of reservoirs ...

Bob spent 10 years with Schlumberger as an openhole field engineer, sales engineer, and product development manager. Since then he has spent 22 years consulting to over 175 companies on petrophysics and completion optimization. He has focused on the integration of petrophysics with completion designs in a variety of reservoirs in North America, conducting numerous field studies for operators evaluating the apparent frac length in over 2000 wells and providing "best practices" recommendations based on the study results (SPE 90483).  He has been responsible for the petrophysical analysis of 40 major fields worldwide as part of integrated reservoir characterization studies identifying remaining mobile hydrocarbons. He has authored 33 technical papers on the integration of petrophysics with completion designs, horizontal wells, and reservoir characterization projects.  Bob has a BS from the US Naval Academy and MBA from the University of Florida. He is also a member of the SPE, SPWLA, and the AAPG.

Full Description

Well performance evaluation in liquids rich shales has received a lot of attention in the literature to date.    While there are a variety of techniques available to estimate effective fracture lengths and areas, the simplest method so far involves a comparison of volumetric oil in place with estimated ultimate recovery from the wellbore.  A hypothesis was proposed in a major West Texas project recently that suggested slickwater fracs were only developing 50 to 60 ft of effective propped height regardless of proppant volume pumped.  This limited height was validated in several vertical pilot wells with radioactive proppant tracers.  When the trajectory of the lateral was compared to the pilot well net pay distribution it was observed that the wells that remained in the limited “sweet spot” had significantly higher recovery factors than those that did not.   In addition, when a recovery factor analysis was made of the expected propped interval 120 acre recovery factors the values were in the 8-10% range.  When the analysis was done for the entire 300 ft +/- gross pay column above and below the propped interval the recovery factors dropped to 1-2%.  In an effort to improve propped height a hybrid  slickwater/borate XLG treatment was pumped into a vertical pilot well with tracers run in the proppant.  It was observed that the propped height for the proppant pumped with the crosslinked portion of the job had a tracer height identical to the 50 to 60ft slickwater conveyed proppant height.  The hypothesis there is that the disconnect between the 2-3 hour break times and the 24-48 hour closure times resulted in a proppant bank suspended in low viscosity fluids rather than the 500 cp +/- borate system.   Subsequent vertical pilot work proposed to improve propped height includes the addition of fiber to help retard settling (Schlumberger’s HIWAY system), the use of N2 bubbles to support the proppant (Trican), and forced closure.  With regard to forced closure a two pronged approach has been recommended.  The first is to force close a vertical pilot well frac with proppant tracers to see if the technique can improve proppant distribution.   Once that is validated it is proposed to force close a lateral completion using an annular coiled tubing frac to enable circulation of the proppant that flows back out of the wellbore.  All three of these techniques are on the board at this time with results expected shortly. 

Organizer Jonathan Godwin

Contact Information


Phone: (281)921-6526


Email:   jgodwin@carboceramics.com

When?

Wed, Sep. 24, 2014
11:30 a.m. - 1:30 p.m. US/Central

How Much?

A $5 donation for the SPE-GCS Scholarship Fund has automatically been added to the registration fee. Use OptOut in the Discount Code field if you do not wish to donate at this time.
Event has ended

Where?

Greenspoint Club
16925 Northcase Drive
Houston, Texas 77060
United States

Club is located at the top of the parking garage.  Parking for SPE GCS events available on roof; just buzz gate attendant at entrance and let them know you're there for the SPE meeting.

Refund Policy: You must notify the SPE-GCS office of your intent to cancel at least 24 hours prior to the event date to receive a refund. For all refund inquiries, email spe-gcs@spe.org. View our Terms & Conditions for more information.