摘要
致密砂岩油藏大规模压裂水平井可采储量是评价水平井开发经济效益的关键,而水平井累计产油及最终采收率与单井控制可采储量有关。利用产量递减法、采油速度法和试井解释3种方法估算了大庆外围T1试验区致密油藏大规模压裂水平井可采储量。结果表明:致密油水平井大规模压裂获得较高产量,但产量递减快,平均采油速度由第1年的2.4%降到第3年的1.1%,66.78%的可采储量在前3年采出;产量递减法和采油速度法预测单井平均可采储量分别为1.31×104t和1.28×104t,解析试井法预测单井平均可采储量为1.11×104t。3种方法预测得到的单井可采储量可作为大规模压力水平井开发效果重要指标和选井依据,对可采储量低的井,建议在精细地质和工程一体化研究基础上,采取有针对性重复压裂和能量补充等措施,进一步改善开发效果。
The recoverable reserves of largely fractured horizontal wells in tight sandstone oil reservoirs are the key to evaluate the economic benefits of the horizontal wells,and the accumulative oil production and ultimate recovery of the horizontal wells are related to the single well controlled recoverable reserves. With the help of the following methods： production decline,oil recovery rate and well test interpretation methods,the recoverable reserves of largely fractured horizontal wells in the tight oil reservoirs in Test Area T1 of Daqing peripheral oilfields were estimated. The achievements show that the large-scale fracturing in the tight-oil horizontal well can obtain high production,but the production decline is rather fast,the average oil recovery rate is reduced from 2. 4% in the first year to 1. 1% in the third year,and 66. 78% of the recoverable reserves are produced in the first 3 years; the average recoverable reserves of the single well are predicted to be 13. 1 × 104 t and 12. 8 × 104 t respectively by the production decline method and the oil recovery rate method,and for the well test interpretation method,the average recoverable reserves per well are 11. 1 × 104 t; the individual-well recoverable reserves predicted by the 3 methods can be used as an important index for the development effects of largely fractured horizontal wells and the evidences for the well selection,for the well with rather lower recoverable reserves,it is suggested that on the bases of the re-search on the integration between the fine geology and engineering,the measures such as the specific repeated fracturing,energy filling and so on should be adopted to further improve the development effects.
作者
周楚艺
ZHOU Chuyi(No.6 Oil Production Plant of Daqing Oilfield Co Ltd.,Daqing 163114,China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2018年第4期161-165,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
中国石油重大专项"大庆油气持续有效发展关键技术研究与应用"(2016E-0210)
关键词
致密油
大规模压裂
水平井
可采储量
tight/dense oil
large-scale/size fracturing
horizontal well
recoverable reserve
