深水高产气井防砂方式及精度优选实验评价

南海L气田作为海上深水高产气田，储层为高孔高渗气藏，细粉砂岩地层，储层物性纵向范围变化较大，部分层位非均质性较强，粒度、泥质含量变化较大。利用常规方法选择防砂方式和挡砂精度往往出现不一致的设计结果。海上深水气田开发的高成本决定了其防砂措施必须可靠，因此需要借助实验手段进一步验证和优化防砂参数。选取L深水气田HL组细粉砂岩为实验对象，模拟地层砂在相同产气量驱替条件下，进行不同防砂方式、不同防砂精度、不同驱替时长、不同砾石充填厚度和不同挡砂介质防砂效果对比实验，从过流能力和挡砂效果两个方面进行综合评价，确定该气田采用120 μm筛网充填20/40目砾石更有优势，并且充填层厚度至少达到1.5 in以上。评价方案具有一定的推广应用价值。

Experimental Evaluation of Sand Control Methods and Precision Optimization for Deep-water High-yield Gas Wells

L gas field in South China Sea is an offshore deep-water high-yield gas field, whose reservoirs are fine siltstones with high porosity and high permeability. The vertical range of reservoir physical properties changes greatly, some horizons have strong heterogeneity, and the particle size and shale content change greatly. There are often inconsistent design results in the selection of sand control modes and sand retaining accuracy by conventional methods.The high cost of offshore deepwater gas field development determines that its sand control measures must be reliable, so it is necessary to further verify and optimize sand control parameters with the help of experimental means. Fine siltstones of HL Formation in L deep-water gas field are selected as the experimental object to simulate the formation sand. Under the same gas production displacement conditions, the comparative experiments of sand control effects of different sand control methods, different sand control accuracy, different displacement time, different gravel packing thickness and different sand retaining media are carried out. The comprehensive evaluation is carried out from two aspects of the overflow capacity and the sand retaining effect. It is determined that the use of 120 μm screens to pack 20/40 mesh gravel in this gas field is more advantageous, and the thickness of the packing layer is at least 1.5 inch. The evaluation scheme has certain popularization and application value.