CN106503284B - 页岩气水平井水平段气层产气性评价方法 - Google Patents

页岩气水平井水平段气层产气性评价方法 Download PDF

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CN106503284B
CN106503284B CN201610818430.3A CN201610818430A CN106503284B CN 106503284 B CN106503284 B CN 106503284B CN 201610818430 A CN201610818430 A CN 201610818430A CN 106503284 B CN106503284 B CN 106503284B
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CN106503284A (zh
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张建平
叶应贵
廖勇
冯爱国
赵红燕
石元会
程国良
季运景
曾帆
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Jianghan Logging Branch Of Sinopec Jingwei Co ltd
China Petrochemical Corp
Sinopec Oilfield Service Corp
Sinopec Jianghan Petroleum Engineering Co Ltd
Sinopec Jingwei Co Ltd
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Abstract

本发明涉及一种页岩气水平井水平段气层产气性评价方法,根据工区内页岩气水平井已试井资料:确定工区的均方根产能指数IAAOF和待评价页岩气井水平段气层长度Lx;估算待评价页岩气井水平段气层水力压裂用压裂液总量VFx、支撑剂用量VSx;利用模型QAOFx=IAAOF×Lx×(VFx+VSx)计算待评价页岩气井水平段气层无阻流量QAOFx;根据QAOFx评价待预测页岩气井水平段气层产气性;输出计算和评价结果。本发明提供了一种测录井现场页岩气水平井水平段气层产气性快速评价方案,能够满足随钻地质导向后的水平段页岩气层产气性评价需求。本发明已在四川盆地某页岩气田应用65口,产气性评价符合率93.8%。

Description

页岩气水平井水平段气层产气性评价方法
技术领域
本发明涉及一种页岩气水平井水平段气层产气性评价方法,主要为页岩气储层品质评价提供关键参数。
背景技术
页岩气是一种新型清洁能源,是国内外非常规能源开发的热点之一。由于页岩气开发起步相对较晚,成本高,风险极大,技术门槛高,导致投资相对较少,在许多关键技术研发方面处于空白。
页岩气水平井水平段气层产气性评价是页岩气开发的关键技术之一。传统的评价方法,主要是利用页岩气储层孔隙度、含气饱和度、总有机碳含量、含气量等关键参数综合评价。由于页岩气水平井水平段气层无阻流量预测误差大,方法缺乏,页岩气储层测录井解释评价和页岩气水平井随钻地质导向后的水平段气层产气性评价很少使用无阻流量参数,无法确定可比的评估对象进行压裂测试效果评估。
随着页岩气开发的深入和实践经验的丰富,研究基于测录井和压裂作业资料的页岩气水平井水平段气层产气性评价方法是非常必要的,能有效提高页岩气勘探开发综合效益。
发明内容
本发明的目的是针对上述技术现状,旨在提供一种能预测产气性能,成本低、精度高、方法简便、适用范围广的页岩气水平井水平段气层产气性评价方法。
本发明目的的实现方式为,页岩气水平井水平段气层产气性评价方法,具体步骤如下:
1)根据工区内页岩气水平井已试井资料:包括页岩气水平井水平段气层长度Ln、压裂液总量VFn、支撑剂用量VSn和无阻流量QAOFn(n为1,2,…,N),确定工区的均方根(RMS)产能指数IAAOF;
2)确定待评价页岩气井水平段气层长度Lx;
3)估算待评价页岩气井水平段气层水力压裂用压裂液总量VFx、支撑剂用量VSx;
4)利用模型QAOFx=IAAOF×Lx×(VFx+VSx)计算待评价页岩气井水平段气层无阻流量QAOFx;
5)根据QAOFx评价待预测页岩气井水平段气层产气性;
6)输出计算和评价结果。
本发明基于页岩气水平井水平段气层已试井资料,快速求取页岩气水平井水平段气层平均产能指数,进而计算待预测井水平段气层无阻流量,通过计算得到的无阻流量评价其产气性;较好地解决了测录井现场页岩气水平井水平段气层产气性快速评价问题,能够满足页岩气水平井随钻地质导向后的水平段页岩气层产气性评价需求,方法简便,成本低。
本发明已在四川盆地某页岩气田应用65口水平井水平段气层产气性评价,无阻流量计算误差平均不超过±20%,产气性评价符合率达到93.8%,精度高、效果好,能满足现场页岩气井无阻流量快速预测和水平段气层产气性评价工作需要,能提高页岩气勘探开发综合效益。
附图说明
图1为本发明工作流程框图;
图2为本发明实际工作流程详图。
具体实施方式
参照图1、图2,本发明的具体步骤为:
1)根据工区内页岩气水平井已试井资料确定平均产能指数IAAOF:
确定均方根(RMS)产能指数IAAOF方法是:
(1)根据获取的工区内页岩气水平井已试井资料,确定建模井数量N,要求N≧6;
(2)根据录井或测井解释结果,获取每口已试井的页岩气水平井水平段气层长度Ln(n=1,2,…,N);
(3)根据压裂作业记录资料,获取每口已试井的页岩气水平井水平段气层水力压裂用压裂剂总量VFn、支撑剂用量VSn、无阻流量QAOFn;
(4)通过公式IAOFn=QAOFn/(VFn+VSn)/Ln计算每口已试井的产能指数IAOFn;
式中:无阻流量QAOFn,单位为104m3/d,
压裂液体积VFn,单位为104m3
支撑剂体积VSn,单位为104m3
页岩气水平井水平段气层长度Ln,单位为100m,
产能指数IAOFn,单位为104m3/d/104m3/100m;
(5)通过公式IAAOF=[(IAOF12+IAOF22+…+IAOFn2)/N]1/2计算已试井均方根(RMS)产能指数IAAOF。
2)确定待评价页岩气井水平段气层长度Lx;
3)估算待评价页岩气井水平段气层水力压裂用压裂液总量VFx、支撑剂用量VSx;
4)利用模型QAOFx=IAAOF×Lx×(VFx+VSx)计算待评价页岩气井水平段气层无阻流量QAOFx;
式中:无阻流量QAOFx,单位为104m3/d,
压裂液体积VFx,单位为104m3
支撑剂体积VSx,单位为104m3
页岩气水平井水平段气层长度Lx,单位为100m,
产能指数IAAOF,单位为104m3/d/104m3/100m;
5)根据QAOFx评价待预测页岩气井水平段气层产气性;评价标准:
无阻流量≧100×104m3/d,为特高产井,
无阻流量≧50×104m3/d,为高产井,
无阻流量≧10×104m3/d,为中等产能井,
无阻流量<10×104m3/d,为低产井;
6)输出计算和评价结果。

Claims (2)

1.页岩气水平井水平段气层产气性评价方法,其特征在于:具体步骤如下:
1)根据工区内页岩气水平井已试井资料:包括页岩气水平井水平段气层长度Ln、压裂液体积VFn、支撑剂体积VSn和无阻流量QAOFn,其中n为1,2,…,N,确定工区的均方根(RMS)产能指数IAAOF;
2)确定待评价页岩气井水平段气层长度Lx;
3)估算待评价页岩气井水平段气层水力压裂用压裂液总量VFx、支撑剂用量VSx;
4)利用模型QAOFx=IAAOF×Lx×(VFx+VSx)计算待评价页岩气井水平段气层无阻流量QAOFx;
5)根据QAOFx评价待预测页岩气井水平段气层产气性;
6)输出计算和评价结果;
所述步骤1)中确定工区的均方根(RMS)产能指数IAAOF方法是:
(1)根据获取的工区内页岩气水平井已试井资料,确定建模井数量N,要求N≧6;
(2)根据录井或测井解释结果,获取每口已试井的页岩气水平井水平段气层长度Ln,其中n=1,2,…,N;
(3)根据压裂作业记录资料,获取每口已试井的页岩气水平井水平段气层水力压裂用压裂液体积VFn、支撑剂体积VSn、无阻流量QAOFn;
(4)通过公式IAOFn=QAOFn/(VFn+VSn)/Ln计算每口已试井的产能指数IAOFn;
式中:无阻流量QAOFn,单位为104m3/d,
压裂液体积VFn,单位为104m3
支撑剂体积VSn,单位为104m3
页岩气水平井水平段气层长度Ln,单位为100m,
产能指数IAOFn,单位为104m3/d/104m3/100m;
(5)通过公式IAAOF=[(IAOF12+IAOF22+…+IAOFn2)/N]1/2计算已试井均方根(RMS)产能指数IAAOF。
2.根据权利要求1所述的页岩气水平井水平段气层产气性评价方法,其特征在于:步骤5)根据QAOFx评价待预测页岩气井水平段气层产气性的评价标准是:
无阻流量≧100×104m3/d,为特高产井,
无阻流量≧50×104m3/d,为高产井,
无阻流量≧10×104m3/d,为中等产能井,
无阻流量<10×104m3/d,为低产井。
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CN107656907A (zh) * 2017-10-24 2018-02-02 中石化石油工程技术服务有限公司 水平井产出剖面测试产量计算方法
CN112630853A (zh) * 2019-10-09 2021-04-09 中国石油化工股份有限公司 基于无阻流量的含气饱和度校正方法和装置
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