**Performance Evaluation of Horizontal Wells**

**Duration:** 3 days

**Course Objective:** This course provides in-depth background and state-of-the-art tools necessary to maximize the performance of Hz wells. Practical examples will illustrate how candidate horizontal wells are selected and designed using multi-disciplined team efforts to ensure both technical and economic benefits are maximized. Methods used to predict well performance; such as, expected producing rate, drainage area, and fluid coning will be explained through class problems. Optimization of Multi-stage Fracing of Horizontal Wells (MFHW), including the number frac stages, spacing between the frac stages, size of the fracs, and how to take advantage of the "sweet spots", will be illustrated using advanced software. The art of well test interpretations will be discussed including the benefits of Mini frac (DFIT) to improve the frac design. The challenge of reserves estimate for tight/unconventional reservoirs using advanced decline curve analysis and probabilistic techniques will be reviewed. Excellent course notes will be provided.

**Audience:** This course is aimed at reservoir, petroleum and exploitation engineers/technologists, geophysicists, and geologists who are involved in the applications and optimization of Hz and specifically Multi-stage Fracing of Hz Wells (MFHW's).

**Course Content:**

**Introduction**- History and level of activities

**Benefits/applications of horizontal wells**- Benefits of drilling horizontal and directional wells
- Uncertainties and risks; geological, drilling, and completion
- Case studies

**Well productivity**- Horizontal well drainage area (analytical/numerical methods)
- Productivity estimate of Multi-stage Fracing of Hz Wells (MFHW)
- Factors influencing well productivity
- Productivity of slanted wells

**Recent developments in Hz well applications**- Frac treatment statistical update in North America
- Application of MFHW's in waterflooding (case studies)

**Design optimization of Multi-stage Fracing of Hz Wells (MFHW)**- The number of fracs or frac spacing (case studies)
- Size of fracs and frac half-length
- Open hole vs. cased hole completion/fracing of MFHW's
- How to take advantage of the "sweet spots"?

**Mini Frac Applications - use of the G-Function**- Reasons/benefits of Mini Fracing
- Diagnoses of different types of leak-off
- Diagnostic Fracture Injection Test (DFIT) analysis techniques including:
- Pre-Frac Closure
- After Closure Analysis (ACA) - Case studies
- Flow-back analysis

**Well test analysis (PTA) and rate transient analysis (RTA)**- Flow geometry/regimes for Hz and slanted wells
- Well test analysis techniques
- Flow geometry/regimes for Hz and slanted wells
- Well test and production analysis techniques, including MFHW's
- Case studies

**Fluid coning prediction**- Determination of the "Critical" rate and time to breakthrough
- Completion optimizing to minimize water production

**Reserve estimates**- Advanced decline curve analysis for tight and unconventional formations, using PLE, SEPD, Modified hyperbolic and Duong
- Statistical, empirical methods, and well typing techniques
- Use of new numerical techniques to estimate Stimulated Reservoir Volume (SRV) and Contacted Reservoir Volume CRV), case study

**Screening criteria and design considerations for Hz well candidates**- How to select successful Hz candidates
- Impact of Hz well orientation on well productivity
- Well Fracability; use of rock mechanic parameters to improve frac treatment results (brittle vs. ductile formations)
- Well flow-back considerations (case study)
- Use of new evaluation tools
- Production logging and "Intelligent" tracer surveys to evaluate performance of MFHW's

**Instructor: Saad Ibrahim, P.Eng.**