How Can Microfracturing Improve Reservoir Management?
- Mayank Malik (Chevron) | Colin Jones (Chevron) | Edward Boratko (consultant)
- Document ID
- Society of Petrophysicists and Well-Log Analysts
- Publication Date
- October 2016
- Document Type
- Journal Paper
- 492 - 507
- 2016. Society of Petrophysicists & Well Log Analysts
- 1 in the last 30 days
- 185 since 2007
- Show more detail
Microfracturing is an excellent method of obtaining direct, in-situ stress measurements, not only in shales, but in conventional reservoirs as well. Recent advances have shown that microfracturing can help improve reservoir management by guiding well placement, optimizing injection rates, and managing perforation strategy.
Microfracturing consists of isolating small test intervals in a well between inflatable packers, increasing the pressure until a small fracture forms and then by conducting a few injection and shut-in cycles, extend the fracture beyond the influence of the wellbore. Results show that direct stress measurements can be successfully acquired at multiple intervals in a few hours and the vertical scale nearly corresponds to electric log resolution. Therefore, microfracture testing, generally performed in a pilot/vertical well, is an appropriate choice for calibrating log-derived geomechanical models and obtaining a complete, accurate, and precise vertical stress profile.
This paper describes the microfracturing process and presents several examples that led to increased hydrocarbon recovery by efficient stimulation and/or completion design. Case studies presented include optimizing hydraulic fracturing in unconventional reservoirs (Delaware Basin, USA), determining safe waterflood injection rates in brownfields (Offshore UK), and helping improve perforation placement in ultradeepwater reservoirs.
Hydraulic fracturing has changed the landscape of hydrocarbon production and reservoir dynamics, especially in unconventional reservoirs, and has also proved very successful in conventional reservoirs, but “getting it right” can still be very challenging for profitable production. Some important factors for success are ensuring optimum lateral landing placement and having accurate and sufficient knowledge of the stress profile across the reservoir. Asset teams are interested in how the in-situ stress field affects the rock’s response to engineering activity, such as drilling and hydraulically fracturing wells. There are several techniques for determining the in-situ state of stress, such as wireline logs and various flavors of injection tests.
|File Size||15 MB||Number of Pages||16|