疏松砂岩稠油油藏水平井临界出砂量数值模拟

NUMERICAL SIMULATION FOR THE CRITICAL SAND PRODUCTION RATE IN THE HORIZONTAL WELLBORE OF UNCONSOLIDATED SANDSTONE HEAVY OIL RESERVOIR

疏松砂岩稠油油藏适度出砂开采过程中，在水平段储层产出砂粒随稠油进人水平井筒后容易沉积形成砂床，造成油层砂埋、油管砂堵等危害。利用FLUENT流体力学软件对适度出砂开采过程中水平井筒不同井筒流速下可携带的临界出砂量开展了数值模拟研究。结果表明，针对不同井简流速条件下，均存在一个临界出砂量，此时水平井段未出现固定砂床，移动砂床平均高度小于5mm，并定量给出了不同井筒流速时的临界出砂量。研究结果可为渤海疏松砂岩油藏适度出砂开采工艺设计提供依据。

In the exploitation process of the moderate sand production from the unconsolidated sandstone heavy-oil reservoirs, the sand particles which are produced in the horizontal reservoirs easily flow into the horizontal boreholes, deposit, and form sand bed. Finally the many damages such as the buried oil reservoirs and blocked oil string by the sand etc. are resulted in. By means of FLUENT hydrodynamic software, the studies of numerical simulation for the critical sand production rates taken under the different conditions of horizontal-borehole flow velocity are conducted in the exploitation process of the moderate sand production. The results show that there all exist a critical sand production in different flow rates. At this time, the fixed sand bed in the horizontal intervals does not occur, the height of moving sand bed is less then 5 mm and furthermore the critical sand production rates are quantitatively presented under the conditions of different borehole velocities. The research achievements stated above can provide evidences for the technological design of the moderate sand production in the unconsolidated sandstone oil reservoirs in Bohai area.