大庆石油地质与开发2018，Vol.37Issue(3)：168-174,7.DOI:10.19597/J.ISSN.1000-3754.201804007
致密油水平井出砂机理
SAND PRODUCING MECHANISM FOR THE HORIZONTAL WELLS IN THE TIGHT OIL
摘要
Abstract
The sand columns of 3 wells were arrived at the wellhead after 16-month production of 10 horizontal wells in the tight oil test area A of Daqing Oilfield,and moreover the problem of the sand production of the horizontal well in the tight oil was increasingly prominent.Through the exploration and discussion of the sand producing mechanism of the horizontal well in the tight oil,the calculating method suitable was studied for the critical pressure drawdown of the sand production for the horizontal wells in the tight oil of Daqing Oilfield.According to the critical pressure drawdown and seepage characteristics for the sand production at the stage of the failure development,the sand control program of the horizontal wells in the tight oil was established.The sand production problem of the horizontal well B in tight oil test area A was governed,and the sand producing mechanism of the horizontal well in the tight well was verified by the pressure build-up test data and production data.The results show that the increase of the watercut is the main cause for the sand production of the horizontal well,and when the watercut is increased,the expanded argillaceous filler in the far wellbore area blocks the formation,while the argillaceous filler in the near wellbore area is loosened and then enters the wellbore in the form of the free sand on the fracture wall with the fluid,thus results in the sand production;the fracture wall would be broken and produce the sand when the production pressure drawdown is greater than the critical drawdown pressure.The horizontal well in the tight oil adopts the intermittent oil production system and produces with the pressure difference less than the critical pressure drawdown,and then the sand production rate is effectively controlled,thereby the production life of the oil well can be prolonged.关键词
水平井/致密油/出砂机理/衰竭开发/生产压差Key words
horizontal well/tight oil/sand producing mechanism/depletion development/pressure drawdown/producing pressure differential分类
能源科技引用本文复制引用
罗杨,徐进杰,王建忠,王鹏,王卓..致密油水平井出砂机理[J].大庆石油地质与开发,2018,37(3):168-174,7.基金项目
国家自然科学基金项目“页岩油气多尺度渗流特征与开采理论”(51490654). （51490654）
