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我国油田多属陆相沉积，油层内或多或少地存在着薄厚不等的夹层或隔层，而且分布不均。对于无气顶底水的这类油层，研究了有隔层水平井产能下降的幅度，研究了与油层相交贯穿油层上下的大斜度水平井和平行油层水平井的产能和采收率。计算分析结果表明：①存在夹层、隔层的油层不适合打平行油层的水平井；②对含有夹层、隔层的油层，选择与油层相交贯穿油层上下的大斜度水平井，可有效地降低夹层、隔层对产能和采收率的负面影响；③当相交油层的水平井长度为平行油层水平井长度的１．１５倍时，无论油层有无夹层、隔层，其产能要大于或等于相应平行油层水平井的产能，而且采收率不会受夹层、隔层的影响；④对无气顶底水的陆相沉积油层，选择与油层相交的长度略长的水平井是稳妥的。图３参６（陈志宏摘）
China’s oil field is mostly continental deposition, there are more or less thick layers of interlayer or interlayer, and uneven distribution. For gas-free bottom-water reservoirs, the productivity decline of horizontal wells with compartments is studied. The productivity and oil recovery of horizontal wells intersecting with the oil layers through the horizontal and vertical wells are discussed. The results of calculation and analysis show that: (1) the reservoir with interlayer and interlayer is not suitable for the horizontal well that hits the parallel reservoir; (2) for reservoirs with interlayers and interlayers, choosing the horizontal well that intersects with the reservoir through the upper and lower sides of the reservoir can effectively reduce Interlayers have negative effects on productivity and oil recovery; ③When the horizontal wells intersecting the oil layer are 1.15 times the horizontal length of the parallel oil formation, the productivity of the oil layer should be greater than or equal to Corresponding parallel oil well horizontal well productivity, and the recovery rate will not be affected by the interlayer, interlayer; ④ For unconsolidated terrestrial sedimentary oil reservoirs, the horizontal wells intersecting the reservoirs with slightly longer length are safe. Figure 3 reference 6 (Chen Zhihong pick)