Effect on Water-Resistant Cement Slurries by Materials Non-Dispersible in Water
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摘要: 川渝地区页岩气储层嘉陵江组裂缝性地层发育、地层水活跃，在钻井过程中出现较为突出的漏失问题，对钻井周期产生很大影响，制约了页岩气井的安全高效开采。针对页岩气井出现的漏失问题，对水不分散水泥浆体系进行研究，对5种多糖类聚合物和有机聚合物材料进行水不分散性能评价，优选出关键材料种类及配比，形成适用于含水漏失层封堵的低密度水不分散水泥浆体系，结合平衡压力堵漏工艺，保证水泥浆注替至漏失层后不被地层水冲散，实现漏失地层的有效封堵，为后续施工创造了条件。低密度水不分散水泥浆体系在川渝地区Z203H6-X页岩气漏失井中成功应用，地层承压当量密度由0.99 g/cm3提高到1.21 g/cm3，后续结合堵漏浆强化堵漏，地层承压当量密度提升至1.81 g/cm3，为川渝地区页岩气井含水裂缝型地层漏失问题提供了一种技术手段。Abstract: In the Chuanyu area, the shale gas producing Jialingjiang Formation is developed with plenty of fractures and formation water. This leads to a mud loss problem which greatly prolongs the drilling time and hinders the safe and efficient development of the shale gas. Cement slurries non-dispersible in water have been studied to deal with the mud loss problem encountered in the shale gas drilling. By evaluating the water non-dispersibility of five polysaccharide polymers and organic polymers, key materials and their quantity ratio are selected, and a low-density cement slurry non-dispersible in water is formulated for cementing water-bearing loss zones. In well cementing with this cement slurry, pressure balance loss control technique was used, and the cement slurry, after being displaced into the well, is not displaced and washed away by the formation water from the loss zones, hence realizing effective sealing of the loss zones and paving the way for subsequent operations. This low-density water non-dispersible cement slurry has been successfully used in cementing the well Z203H6-X drilled in the Chuanyu area, the equivalent circulating density (ECD) of the formation into which mud has been lost is increased from 0.99 g/cm3 to 1.21 g/cm3. In subsequent operations lost circulation slurries were used to enhance the compressive strength of the formation, and the ECD of the formation was further increased to 1.81 g/cm3. This cement slurry has provided a technical means to solve the lost circulation problem encountered in drilling the fractured water-bearing formations in shale gas drilling in the Chuanyu area.
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表 1 不同材料配比的水泥浆水不分散性能
配方 流动度/
cm常温水 90 ℃热水 水不分散性 pH 水不分散性 pH 0# 22 差 13 差 13 1# 21 热 8 中 10 2# 22 良 9 差 13 3# 18 优 8 中 10 4# 20 优 7 优 8 5# 22 优 7 中 12 
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表 2 不同水泥浆配方实验结果
水不分散
材料/%浆体流动度/
cm常温水 90 ℃热水 水不分散性 pH 水不分散性 pH 1.5 22 中 11 差 13 3.0 20 优 7 良 9 4.0 16 优 7 优 8
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