Low-Cost Fracturing Technology in Normal-Pressure Shale Gas Reservoirs in Wulong Block
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摘要:
武隆区块常压页岩储层能量低，产量较低，实现效益开发难度大，为此，开展了低成本压裂开发技术研究。在分析武隆区块压裂改造技术难点的基础上，进行了诱导应力计算、压裂裂缝模拟和压裂费用对比，优化了压裂段长、簇数和压裂施工参数，优选了压裂材料和压裂设备，形成了“短段长+单簇滑套+低黏滑溜水+低成本石英砂+高砂比连续加砂”的压裂施工工艺，并在武隆区块A 井进行现场试验。通过应用无限级滑套完井工艺和实时调整现场压裂参数，A 井压后产量与同平台“中等段长+密切割+全陶粒支撑剂”压裂井产量相当，压裂成本降低52.8%，并实现了单井单日8 段压裂施工。低成本压裂技术为武隆区块常压页岩气的效益开发提供了新的技术途径。
Abstract:Normal-pressure shale reservoirs in Wulong Block have low energy and production, and suffer from difficulties in beneficial development. For this reason, a low-cost fracturing technology was studied for its development. Considering difficulties of fracturing stimulation in Wulong Block, induced stress calculation, fracture simulation, and fracturing cost comparisons were carried out. This allowed the fracturing stage length, number of clusters, and operation parameters to be optimized. Further, the fracturing materials and equipment were chosen. A new fracturing technology was thereby developed, involving a short fracturing stage length, a single-cluster sleeve, low-viscosity slick water, low-cost quartz sand, continuous sand addition at a high proppant concentration, which was then applied in the field test on Well A in Wulong Block. Through the application of the unlimited sliding sleeve completion and the real-time adjustment of on-site fracturing parameters, the production of Well A after fracturing was comparable to that of the fracturing well on the same platform with fracturing parameters of a medium fracturing stage length, tight cluster spacing, and ceramic proppants. In this study, the fracturing cost was reduced by 52.8%, and the fracturing performance sped up to 8 stages per day. The low-cost fracturing technology has provided technical reference for the beneficial development of normal-pressure shale gas in Wulong Block.
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图 2 不同压裂段长下的无因次压裂成本（以段长75 m为基准）
Figure 2. Dimensionless fracturing cost for different fracturingstage lengths (based on a 75 m fracturing stage length)
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图 3 不同压裂方案的裂缝参数模拟结果
Figure 3. Fracture parameters simulated under different fracturing schemes
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图 4 不同支撑剂组合的无因次费用对比（以全陶粒为基准）
Figure 4. Dimensionless cost comparison for different proppant combinations (based on ceramic)
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图 6 累计产气量和返排率关系曲线
Figure 6. Relationship between cumulative gas production and flowback rate
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图 7 A井和B井不同生产时间下的气液比
Figure 7. Comparison of gas-to-liquid ratio at different time between Well A and Well B
表 1 武隆区块开发井生产数据
Table 1 Production data of development wells in Wulong Block
井号 平均段长/m 归一化无阻流量/104m3 日均产气量/104m3 X1 78 15.7 1.70 X2 96 9.2 1.68 X3 74 7.3 0.82 
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