水平井变孔密筛管控流特性物模评价试验

A Physical Model Test on Flow Control Characteristics of Varied Perforated Premium Screens for Horizontal Well Completion

人们普遍认为变孔密筛管控流压降仅由基管孔眼本身产生,而忽略了管外储层砂堆积层和筛管挡砂材料这2个因素,导致设计结果不合理。为此,采用试验方法评价了筛管样件控流特性,并以基管样件作为对比,得到了基管孔密影响控流压降的本质:当孔密和流量相同时,筛管样件控流压降明显大于基管样件,且对孔密和流量更敏感;筛管样件控流压降主要产生于管外储层砂堆积层和挡砂材料;孔眼本身并未产生明显压降,主要起调节渗流流场的作用,小孔密迫使油层产液在进入筛管内部之前,在渗流介质内流动更长距离,从而明显提高压降。根据试验结果,设计了LXA102断块LXA102-P7井的合理变孔密筛管完井方案。以开井1a为期对比邻井,应用该方案后,LXA102-P7井累积产油量提升500m^3以上,产液含水质量分数降低5%以上。

It is generally believed that the pressure drop of varied perforated premium screen is only generated by the base tube perforation, which ignores the two factors of accumulated reservoir sand layer and sand-blocking material of screen, leading to unreasonable design results. In view of this, the flow control characteristics of the screen samples were evaluated by the test method, and compared with that of the basic tube to attain the essence of base tube hole density effects on the flow control pressure drop. Given the same hole density and flow rate, the flow control pressure drop of the screen sample is obviously larger than that of the base tube, and is more sensitive to the hole density and flow rate. The flow control pressure drop of the screen is mainly caused by accumulated reservoir- sand layer and sand-blocking material. The perforated hole has little pressure drop and mainly provide the adjust-ment of the seepage flow field. The large hole density forces the produced liquid to flow through a longer distance in the seepage medium before entering the screen, thus obviously increasing the pressure drop. According to the test results, a reasonable varied perforated premium screen completion plan was designed for the Well LXA102-P7 in Block LX A102. After application of the plan for one year, compared with the offset well,the accumulated oil pro-duction in Well LX A102-P7 increased by more than 500 m3; the mass fraction of produced water decreased by more than 5%.