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Vol. 157, Issue 10, October 2013, pp. 248-252

 

Bullet

 

Numerical Simulation on Well Pattern Adjustment Involving Starting Pressure Gradient for Low Permeability Oilfield
 
* Yin Daiyin, Song Xin, Zhang Xiaoran, Zhang Chengli

School of Petroleum Engineering, Northeast Petroleum University Daqing, Hei Longjiang 163318, China

 * Tel.: 13836922935

* E-mail: yindaiyin@163.com

 

Received: 11 July 2013   /Accepted: 25 October 2013   /Published: 31 October 2013

Digital Sensors and Sensor Sysstems

 

Abstract: The development of low permeability oilfield has certain particularities and difficulties. According to the characteristics of the low permeability oilfield, based on the non-Darcy seepage mechanical mechanism of low permeability core, and considering the starting pressure gradient, the three-dimensional three-phase non-Darcy seepage mathematical model of low permeability oilfield was set up and the results were obtained by difference method. Taking the block 55 of Chao Yang Gou oilfield for example, the well pattern adaptabilities of the four well pattern, rhombic inverted nine-spot well pattern, inverted nine-spot well pattern, rectangular five-spot well pattern and unequal spacing linear well pattern were studied by the numerical simulation method. The results showed that the rhombic inverted nine-spot well pattern was adopted in the early development period of the low permeability oilfield, and then turned into the rectangular five-spot well pattern or the unequal spacing linear well pattern through injection-production adjustment. The corresponding ultimate recovery factors were improved with 1.12 and 1.36 percentage points, respectively. The reasonable well-pattern adjustment method could be selected according to the actual situation of the oilfield.

 

Keywords: Low permeability, Mathematical model, Well pattern adjustment, Starting pressure gradient, Numerical simulation.

 

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