头台油田开发后油层破裂压力的确定

Research of the Formation Breakdown Pressure in Toutai Oilfield Development

头台油田开发初期,确定油层破裂压力计算公式为Pf=0.01783H,由此计算出的油层中部破裂压力22.28MPa。但随着油田的开发,初期确定的破裂压力计算方法已经不适合头台油田生产实际。为此,通过对头台油田99井次破裂压力值进行统计,结合头台油田地层参数,分为3个区块分别计算不同地层的破裂压力。提出了适应于每个区块的地层破裂压力计算公式,并将计算值与压裂实测值进行对比,确定计算结果与实测结果接近,可以利用该组公式计算头台油田开发后不同区块的破裂压力值。

During the early days of exploitation in Toutai oilfield, it was used the following formula to calculate the formation breakdown pressure： Pf = 0.017 83H. The breaking the formula is 22.28 MPa. But with the developing in oil-fields, pressure in middle of oil-layers that is got from the early calculation method of breakdown pressure does not suitable for the production practice in Toutai Oilfield. By statistic the formation breakdown pressure of 99 wells in Toutai Oilfield and combined the stratum parameter, it was divided 3 blocks to calculate the different formation breakdown pressure. The calculation formula that suitable for the different formation breakdown pressure was provided. By eomparition the calculation and the fracturing measured data, the result was close to and the formula can be used to calculate the different formation breakdown pressure in Toutai Oilfield development.