关键词: 致密油藏, 体积压裂, 地应力场, 缝间距优化, 数值模拟, 玛湖油田

Abstract: In order to fully understand the conditions of tight conglomerate reservoir in the Mahu Oilfield, reduce the interference of inter-well fractures, achieve precise fracturing and complete productivity prediction, a three-dimensional numerical model was established with the simulation of geology, in-situ stress, and fracturing coupling. Taking the experimental area of the Mahu tight oil reservoir as an example, a single well in-situ stress model was completed according to the existing geological data, an accurate three-dimensional in-situ stress model was established on the in-situ stress model, and an artificial fracture model was loaded. With the coupled fracturing model, the rule of in-situ stress changing with time and space after the fracturing was completed in the study area was analyzed and compared with the artificial fracture morphology under static geological conditions. It was found in the study that the production indicators obtained by fitting the three-dimensional numerical model were highly accurate, with practical significance. The three-dimensional numerical model was used to obtain the engineering parameters of Well X in the experimental area of the Mahu tight oil reservoir. After the reservoir was put into production, the average daily oil produced was 23.4 t/d within 300 days, the average oil pressure was 22.3 MPa, and the stable production duration was long. This study will be in favor of optimizing the fracturing design and reducing the interference of stress shadow.

Key words: tight oil reservoir, fracturing by stimulated reservoir volume (SRV), in-situ stress field, fracture spacing optimization, numerical simulation, Mahu Oilfield