Event key details
ICoTA Europe Webinar - Times indicated are GMT
2nd November 2020
2:00pm
- 3:00pm
The webinar will begin with a short Techbyte presentation focusing on the technology, followed by a 20-minute presentation on the case history.
Book your free place online here
Background
The Valhall field has always required proppant stimulation to maximize production from the wells and to maintain chalk stability. The practice has always been to individually prepare each zone for treatment using Coiled Tubing (CT), and the remove the CT-string from the well before proceeding with the proppant fracture stimulation. This is repeated for each of the zones in the horizontal lateral and this process can take weeks and month to complete.
New Approach
Given the economic challenges and needs to optimize our hydraulic proppant stimulation method, a new approach was successfully implemented offshore. This system is called “Single-Trip Multi-Frac” or STMF and uses a series of sliding sleeves located in the lateral section of the well allowing to fracture stimulate in each desired interval.
“We went from being able to stimulate a new zone every two to three days on average, to being able to take two up to four on one single day, which is a significantly increases efficiency”.
The Benefits
STMF will deliver significant time savings by reducing the numbers of CT trips required to fracture stimulate the horizontal wells on Valhall. Using STMF, multiple zones can be individually proppant fracture stimulated with just one CT trip. With the CT -string left in the well, the proppant treatment is pumped down the annulus between the CT-string and production tubing.
The application of STMF has been used extensively onshore, particularly in the un-conventional market in North America, where multiple zones across very long laterals in tight rock formation need to be stimulated.
Whilst the STMF has a job history of about 10,000 wells onshore, there are no recorded uses of STMF offshore, until today. This is primarily due to the logistic challenges e.g. fresh water and proppant supply and concerns and risks associated with pumping stimulation proppant slurry around the CT-string