Analytical Study to Estimate Re-entry Horizontal Well Productivity of Amara oil Field

الملخص

Amara is situated south east of the city of Missan. The structure of Amara field is approximately about 9 Km long and 5 km width. This field is produced from three producing reservoirs Khasib, Mishrif and Nahr Umar. Most of the wells in this field that are producing from the main pay zone (Nahr Omar) suffer from sand production problem that was led to completely shut-in the wells due to accumulated sands in the wellbore.    

The objective of this study is to investigate re-entry horizontal wells as a solution that may lead to minimize the well problems especially that is concern with sand problem, keeping into consideration the increasing wells productivity. 

The production of horizontal wells can dramatically be improved by providing a greater contact of reservoir to the wellbore. Horizontal wells may also offer other advantages such as decreasing pressure drop, fluid velocities around the wellbore, minimizing water and gas coning as well as accelerated production. This may be extended to include the elimination of sand production problem from unconsolidated sand formations. Additionally, the design of horizontal wells must also includes the sand screens and/or gravel pack completion. 

Due to limited geological and reservoir data of Amara oil field, advance analytical software was used to analyze the production history for two vertical wells AM/2 and AM/3. These wells are completely shut-in due to sand accumulation in the wellbore. The analytical solution converts the vertical well geometry into horizontal well model using same reservoir and fluid characteristics to estimate horizontal wells productivity increment for different pressure drawdowns and stimulation process. 

The results showed that well AM/3 has greater response for production increment against the applied reservoir pressure drawdowns and stimulation activity than (well AM/2). This conclusion may led to select (well AM/3) to be much superior than (well AM/2) for eliminating sand control production.