Gas and WAG Injection in the Varg field – A Successful IOR Story

Welcome to a new L&L seminar from the IOGR group.

The seminar will be held in Tor auditorium at NPD offices in Stavanger.

  • Date 03.11.2016
  • Time 11:00
  • Duration 2 hours
  • Participants 25
  • Register by 31.10.2016
Gas and WAG Injection in the Varg field –        A Successful IOR Story_main_img
Gas and WAG Injection in the Varg field – A Successful IOR Story

The Varg Oil field was developed with a Wellhead Platform and a FPSO and first oil was in 1998. By cease of production in  June 2016, 3 times the original PDO volume was produced. The increase in reserves was mainly due to infill drilling and new segments being brought on stream, but also gas injection and WAG played an important role in Varg late life.

The Varg reservoir consists of shallow marine, Late Jurassic sandstones, deposited adjacent to a structural high generated by salt movements from Late Jurassic onwards. The reservoir sands vary in thickness, but are typically 30-40m thick, intermingled by shale. The base of the reservoir rests on Triassic rocks. The combination of relatively thin sands and complex faulting due to salt related tectonics makes the reservoir challenging both to interpret and produce The oil is under-saturated light oil of 35 deg API, GOR of 100-140 Sm3/Sm3 and Oil viscosity of 0.3-0.4 cP at saturation pressure which is varying from 220-170 bar.

 In 2011 immiscible WAG was instigated in an Eastern Segment on Varg. On order to start WAG in this segment,  only minimal topsides modification was  needed. Shortly after WAG injection, significant rate increase and water cut reduction were seen in the offset producer. Estimated reserves increase from the WAG injection is 2-4 mmstb. The incremental production had a profound impact on Varg late production profile and economics.

 Huff’nPuff gas injection was started in a producer which did not have any pressure support. Short cycles of gas injection was followed by production cycles. These injection and production cycles increased production from the well.

IOR does not have to be expensive oil which is recovered many years after a large investment, the example from Varg shows that IOR can be cheap, give rapid production increase and significantly add reserves.

 

Agenda:

11:00 Lunch
11:30 Presentation

 

FORCE seminars have previously been fully booked with waiting lists so you are encouraged to sign up as soon as you know you will attend.

Participant fees
 
FORCE member
Free
Non-member
NOK 1000,-
University/student
Free

Please find registration box at the top right of the page. 

Important information:
You can register as a FORCE member and pay "FORCE member" price if you are an employee of a member company.
All FORCE member companies are listed here.

Payment is made online by credit card. Please note that no refunds will be given after you have signed up. If you for any reason can not attend the workshop, you are welcome to send a representative, just inform Janne Puntervold as soon as there are changes.  

Photo: Øyvind Hagen - Statoil