深圳大学学报理工版

通过水平井缝网压裂技术实现涪陵地区页岩气藏的页岩气商业规模化开采.结合岩石力学分析和油藏数值模拟,对水平井缝网形态学、裂缝密度、裂缝方位和裂缝非均匀铺砂等进行研究.结果表明,裂缝方位与井筒夹角为90°时产气量最大; 网络裂缝等长时气井采出程度最高,两边长中间短的裂缝形态次之,储层改造体积小的裂缝形态压裂效果最差; 同样的改造区域,裂缝密度越大,压裂效果越好,压裂时需沟通微裂缝,形成网络裂缝; 非均匀铺砂对页岩气井产能影响大,高浓度均匀铺砂比低浓度均匀铺砂产能高,非均匀铺砂产能居于两者之间,模拟显示每条裂缝产气量差异较大.

Commercial shale gas production is achieved by using horizontal network fracturing techniques in the Fuling shale gas reservoir. Combining rock mechanics analysis and numerical reservoir simulation, we investigate the effects of horizontal fracture network morphology, fracture density, fracture orientation and uneven proppant distribution on the performance of well productivity. The results show that the gas well with equal-length fractures has the highest value of recovery factor, followed by the case with longer fractures on sides but shorter in the middle. Moreover, the worst fracturing performance is achieved for the fracture pattern with the smallest SRV(stimulated-reservoir volume). The largest gas production rate is obtained when the angle between fractures and wellbore becomes 90°. In the same stimulated block, fracturing performance can be enhanced for the cases with higher fracture and micro-fractures density that are connected to develop fracture network. Furthermore, the case of uneven proppant distribution has significant influence on well productivity in shale gas which is higher than that of the uniform proppant distribution at low concentration but lower than that of the uniform proppant distribution at high concentration. This paper provides important guidance for the development of multistage fracturing in the Fuling block.

引言
1 压裂区块及X井简介
2 裂缝方位对产能的影响
3 缝网形态对产能的影响
4 裂缝密度对产能的影响
5 非均匀铺砂对产能的影响
6 结论

$图1 三种裂缝方位角示意图 Fig.1 Three types of fracture azimuth$

图1 三种裂缝方位角示意图
Fig.1 Three types of fracture azimuth

$图2 三种裂缝方位产量变化 Fig.2 Productivities under three types of fracture orientations$

图2 三种裂缝方位产量变化
Fig.2 Productivities under three types of fracture orientations

图3 不同方案下裂缝形态<br/>Fig.3 Fracture patterns of different cases

图3 不同方案下裂缝形态
Fig.3 Fracture patterns of different cases

图4 五种形态不同时间下压力分布<br/>Fig.4 Pressure distributions of five patterns in different years

图4 五种形态不同时间下压力分布
Fig.4 Pressure distributions of five patterns in different years

$图5 方案2和方案3端部缝及段内部缝日产对比 Fig.5 Comparison of daily production of outer and inner fractures in case 2 and case 3$

图5 方案2和方案3端部缝及段内部缝日产对比
Fig.5 Comparison of daily production of outer and inner fractures in case 2 and case 3

图6 五种形态产量变化<br/>Fig.6 Productivities of five patterns

图6 五种形态产量变化
Fig.6 Productivities of five patterns

$图7 三种裂缝密度分布 Fig.7 Density distributions of three types of fractures$

图7 三种裂缝密度分布
Fig.7 Density distributions of three types of fractures

$图8 三种裂缝密度分布压力降示意图(1年) Fig.8 Pressure drops of three types for fracture density distributions(1 year)$

图8 三种裂缝密度分布压力降示意图(1年)
Fig.8 Pressure drops of three types for fracture density distributions(1 year)

$图9 三种裂缝密度分布产量变化 Fig.9 Productivities under three types of fracture density distributions$

图9 三种裂缝密度分布产量变化
Fig.9 Productivities under three types of fracture density distributions

图10 不同铺砂量比分布对比<br/>Fig.10 The comparison of different proppant distributions

图10 不同铺砂量比分布对比
Fig.10 The comparison of different proppant distributions

图11 非均匀铺砂裂缝表征方法<br/>Fig.11 Characterization of non-uniform proppant distributions

图11 非均匀铺砂裂缝表征方法
Fig.11 Characterization of non-uniform proppant distributions

图12 非均匀铺砂压力分布示意图<br/>Fig.12 The pressure distribution with uneven proppant displacement

图12 非均匀铺砂压力分布示意图
Fig.12 The pressure distribution with uneven proppant displacement

图13 非均匀铺砂日产量对比示意图<br/>Fig.13 The production rate with uneven proppant displacement

图13 非均匀铺砂日产量对比示意图
Fig.13 The production rate with uneven proppant displacement

图14 三种支撑剂铺置方式产量变化<br/>Fig.14 Productivities of three types under proppant distributions

图14 三种支撑剂铺置方式产量变化
Fig.14 Productivities of three types under proppant distributions

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备注

引言

1 压裂区块及X井简介

2 裂缝方位对产能的影响

3 缝网形态对产能的影响

4 裂缝密度对产能的影响

5 非均匀铺砂对产能的影响

6 结论

期刊信息

备注

引言