塔河底水砂岩油藏不同水淹模式下堵水适应性分析

Water plugging adaptability under different water-flooding modes in Tahe bottom-water sandstone reservoirs

何昶 杨松 张伟 陈友梦 李丹丹

He Chang Yang Song Zhang Wei Chen Youmeng Li Dandan

中国石化西北油田分公司采油一厂, 新疆轮台 841600

No.1 Oil Production Plant, SINOPEC Northwest Company, Luntai, Xingjiang 841604, China

底水砂岩油藏水平井见水后产量下降快,递减大。堵水作为水平井治理的有效手段,其效果受水平井水淹程度影响很大,因此有必要研究砂岩水平井的水淹特点和堵水适应性。通过研究塔河底水油藏水平井水平段渗透率组合形式对油井水淹模式的影响,按照水平段水淹程度将水淹模式分为点状水淹、逐级水淹、多段水淹和均匀水淹4种类型。并根据其对应的剩余油分布特点,提出了相应的堵水工艺。通过矿场实践证明点状水淹和多段水淹模式下剩余油潜力主要以油水同出和低渗未动用段为主,适合于多轮次堵水进行挖潜。在多轮次堵水过程中,油水同出段逐渐成为水平井主要的潜力段,适宜采用堵疏结合的复合堵水进行挖潜,可为同类油藏的水平井治理提供参考依据。

When the horizontal wells of sandstone reservoirs with bottom water have water, their productions will fall quickly and sharply. Water flooding, as an effective measurement in horizontal well management, is restricted by water flooding extent. As a result, it is necessary to study the characteristics of water flooding and the adaptability of water plugging in horizontal wells. We studied the influence of permeability association type of horizontal sections of horizontal wells in bottom-water reservoirs of the Tahe Oil Field on the water flooding mode of oil wells. There are four flooding modes, including dot flooding, step flooding, multistage flooding and uniform flooding, according to the flooding extent of horizontal sections. Corresponding plugging techniques were proposed in view of residual oil distribution. Under the modes of dot flooding and multistage flooding, oil usually remains in low-permeability sections and is mixed with water, and multi-round water-plugging is recommended. The oil and water mixing sections will turn to the main potential sections in horizontal wells during multi-round water-plugging. Complex water-plugging with block and hydrophobicity to dig the potential is recommended.

https://doi.org/10.11781/sysydz2015S1084