Nowadays, horizontal wells play a vital role in the production from thin heavy oil reservoirs. Designing a suitable completion for this kind of reservoirs is a decisive factor to boost the efficiency of durable production. This study deals with the optimization of perforated liner design for horizontal wells in Sarvak oil reservoir, which is located in the southwest of Iran. Sarvak is a carbonate oil reservoir, but it contains shale and mudstone. To avoid solid production and formation collapse, the screen liner was selected as a cost-effective solution. There were two choices, either perforated liner or slotted liner. The perforated liner was selected by finite element analysis and strength checking, which was proven by laboratory experiments. Sensitivity analysis was performed on various perforated parameters such as phase angle, hole density, hole diameter and hole distribution to determine the pattern of the holes so that enough strength of the liner was maintained while maintaining the maximum hole density. Then, parameters of perforated liner were determined by calculated loss of the flowing path, collapse resistance strength and tensile strength of casing pipes after perforated. As a result, hole density, hole size and perforated pattern were selected 100 HPM, 10 mm and 4-thread-line, respectively, in 4 ½” liner with 13.5 ppf. The ratio of the strength of the optimized perforated liner was less than 8% for collapse and 5% for tensile compared to the same specification casing.

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水平油井射孔衬管参数的优化

如今，水平井在稀薄稠油油藏的生产中起着至关重要的作用。为这类油藏设计合适的完井装置是提高耐久生产效率的决定性因素。这项研究针对位于伊朗西南部的萨尔瓦克（Sarvak）油藏的水平井的穿孔衬管设计进行了优化。萨尔瓦克（Sarvak）是碳酸盐油储层，但其中含有页岩和泥岩。为避免固体产量和地层塌陷，筛网衬里被选为经济高效的解决方案。有两种选择，穿孔衬板或开槽衬板。通过有限元分析和强度检查选择了穿孔衬管，并通过实验室实验证明了这一点。对各种穿孔参数（例如相角，孔密度，孔直径和孔分布来确定孔的样式，以便在保持最大孔密度的同时保持足够的衬里强度。然后，通过计算出的流路损失，穿孔后套管的抗塌陷强度和抗拉强度，确定穿孔衬管的参数。结果，在13.5 ppf的4½“衬管中分别选择了100 HPM，10 mm和4螺纹线的孔密度，孔尺寸和穿孔图案。与相同规格的套管相比，优化的穿孔衬里的强度比对于塌陷小于8％，对于拉伸小于5％。通过计算流道的损失，穿孔后套管的抗塌陷强度和抗拉强度来确定穿孔衬管的参数。结果，在13.5 ppf的4½“衬管中分别选择了100 HPM，10 mm和4螺纹线的孔密度，孔尺寸和穿孔图案。与相同规格的套管相比，优化的穿孔衬里的强度比对于塌陷小于8％，对于拉伸小于5％。通过计算流道的损失，穿孔后套管的抗塌陷强度和抗拉强度来确定穿孔衬管的参数。结果，在13.5 ppf的4½“衬管中分别选择了100 HPM，10 mm和4螺纹线的孔密度，孔尺寸和穿孔图案。与相同规格的套管相比，优化的穿孔衬里的强度比对于塌陷小于8％，对于拉伸小于5％。