Analysis of the Anti-Gas Channeling Effect and Weight Loss Law of Styrene-Acrylic Latex Cement Slurry
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摘要:
水泥浆候凝期间，因其失重引发的环空气窜，是导致气井环空带压的重要因素之一，掌握水泥浆失重模式与规律，是预防环空气侵的重要基础。以苯丙胶乳防气窜水泥浆为研究对象，采用压力传导精确测量装置进行了水泥浆失重试验，测量了不同胶乳加量、温度、气压、模拟井筒深度等条件下水泥浆浆柱压力的变化，进行了防气窜效果评价与失重规律分析。试验发现：在气层压力（18 kPa）高于底部浆柱压力（12～16 kPa）的情况下，苯丙胶乳水泥浆依然可有效防止气窜；水泥浆形成触变或胶凝结构后压力快速降低，随着水化反应进行压力缓慢降低，稠化前压力再次加速下降，而气窜应出现在第一拐点附近。基于该研究成果，可对水泥浆的防气窜性能进行评价，以优选出适合高压气井的防气窜水泥浆，并为建立水泥浆失重预测模型提供试验基础。
Abstract:During the WOC of cement slurry, gas channeling in the annulus caused by its weight loss is one of the important factors leading to the sustained casing pressure (SCP). Understanding the weight loss modes and law of cement slurry is an important way to prevent gas intrusion in the annulus. Taking the styrene-acrylic latex anti-gas channeling cement slurry system as the research object, the weight loss test of cement slurry was carried out by means of pressure conduction precision measuring device, and the pressure change data of cement slurry under different latex dosage, temperature, gas pressure and simulated wellbore depth were measured, and the anti-gas channeling effect evaluation and weight loss law analysis were carried out. The test found that the styrene-acrylic latex could still effectively prevent gas channeling when the gas-bearing formation pressure (18 kPa) was higher than the bottom pressure of slurry column (12-16 kPa). In this case, the pressure dropped rapidly after this system formed a thixotropic or gelled structure. As the hydration reaction went on, the pressure decreased slowly, then the pressure of cement slurry dropped rapidly again before the thickening, and the dangerous time of gas channeling should appear near the first inflection point. Based on the research results, the anti-gas channeling performance of cement slurry could be evaluated to select the anti-gas channeling cement slurry system suitable for high-pressure gas wells, and such results could provide test basis for the establishment of cement slurry weight loss prediction model.
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Keywords:
- cementing /
- anti-gas channeling /
- latex cement slurry /
- weight loss test /
- weight loss model /
- weight loss law
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图 1 水泥浆压力传导精确测量装置的结构
Figure 1. Structure of cement slurry pressure conduction precision measuring device
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图 2 清水和净浆液柱压力变化曲线
Figure 2. The slurry column pressure variation curves of fresh water and paste
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图 3 相同温度压力条件下不同类型浆体的防气窜效果
Figure 3. The anti-gas channeling effect of different types of slurry under the same temperature and pressure conditions
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图 5 斜率变化显著的两段式失重曲线
Figure 5. Two-stage weight loss curve with significant slope change
表 1 苯丙胶乳防气窜水泥浆的综合性能
Table 1 Comprehensive performance of styrene-acrylic latex anti-gas channeling cement slurr
苯丙胶乳加量，% 温度/℃ 流动度/cm 六速旋转黏度计读数 流性指数 稠度系数/（Pa·sn） 滤失量/mL 析水量/mL 5.0 93 24 255/201/128/76/7/4 0.752 0.815 35 0 10.0 93 24 241/195/120/73/8/5 0.717 0.937 26 0 15.0 93 23 238/200/130/80/8/5 0.774 0.727 19 0 20.0 93 22 264/214/165/98/9/6 0.751 1.053 14 0 
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表 2 苯丙胶乳水泥浆失重试验参数
Table 2 The parameters of styrene-acrylic latex anti-gas channeling cement slurry weight loss test
基本配方 苯丙胶乳加量，% 气压/kPa 温度/℃ 备注 纯水 0 0～18 室温 纯水对比试验 G级水泥+44%水 0 0，15，18 30，50 净浆对比试验 G级水泥+44%水 5～20 0，15，18 30，50 苯丙胶乳加量变化试验 G级水泥+44%水 5，10 4～20 30，50 气压变化试验 G级水泥+44%水 5，10 0，15，18 30～70 温度变化试验
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