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赤水地区某酸化气井污染深度的求取方法
断块油气田
2007年 14卷 第02期
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Title
Calculation method of pollution depth of ac idized
gas we ll in Chishui region
Authors
Lu Cong , Guo J ianchun, YanX iaobing, et al.
单位
1 西南石油大学油气藏地质及开发工程国家重点实验室, 四川成都610500; 2 川东钻探公司, 重庆400020;
3 西北油田分公司工程设计院, 新疆乌鲁木齐830002
Organization
State Key Laboratory of O il and Gas
Reservoir Geo logy and Exploitation, Southw estPetroleum
University, Chengdu 610500, China
摘要
赤水地区由于天然裂隙普遍发育, 在钻井、完井以及后续作业过程中的外来液体往往沿天然裂缝穿透而停滞, 造成深度污染。基质酸化要想得到理想的结果, 必须采用大酸量才能深穿透污染带。同时, 严重的裂缝污染又降低了施工时地层吸液能力。根据达西定理推导了计算酸液进入地层的径向深度的公式, 实例计算了该地区一口井的污染深度, 经分析能够较好地反映地层情况, 能为该地区进一步开发提供施工依据。
Abstract
In the process of the dr illing, the ex otic liqu id during the
comp le tion and succeden t activ ities penetrates through the
natural fractures wh ich are comm on in Ch iShui reg ion, and
stagnates and resu lts in the se rious po llution. In orde r to get
the idea l outcom e o f m atrix acidifica tion, a large numbers o f
acid must be used to pene trate the con tam inated zone.
M eanw hile, the severe contam ination o f fracture depresses the
w ater- absorption ability o f the stra tum. So it is necessary to
do the research on the contam ination deg ree of the gas w e ll in
ChiShu i reg ion. A cco rding to the Darcy theo ry, th is paper
deducts the calcu lation o f the equation of radial depth when
acid liquo r ente rs stratum and calculates the depth o f well
contam ination in th is reg ion, w hich effic iently reflects the
stra tum situa tion through the ana lysis and supplies an
acid ifica tion re ference for further developm ent to th is reg ion.
Keywords:
Chishu,i pollution depth, sk in factor,
reservo ir.;
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