石油钻探技术
石油鑽探技術
석유찬탐기술
PETROLEUM DRILLING TECHNIQUES
2014年
6期
73-79
,共7页
蒲春生%陈庆栋%吴飞鹏%何延龙%孙威
蒲春生%陳慶棟%吳飛鵬%何延龍%孫威
포춘생%진경동%오비붕%하연룡%손위
致密砂岩油藏%水平井%分段压裂%物理模拟%模拟试验%YP8井
緻密砂巖油藏%水平井%分段壓裂%物理模擬%模擬試驗%YP8井
치밀사암유장%수평정%분단압렬%물리모의%모의시험%YP8정
tight sandstone reservoir%horizontal well%staged fracturing%physical stimulation%stimula-tion test%Well YP 8
针对鄂尔多斯盆地致密砂岩油藏五点法联合注采井网的特点，为实现储层改造并控制水窜，对水平井分段压裂的布缝方式和裂缝参数进行了研究。基于水电相似原理，对联合注采井网不同压裂方式进行了电模拟试验，优选了压裂方式及裂缝展布形态；采用油藏数值模拟方法对分段压裂的具体参数进行了优化。电模拟试验结果表明，分段压裂比传统双翼压裂的低压区面积增大36.4％、产能提高72.5％，纺锤形布缝方式最适于五点法联合注采井网；油藏数值模拟结果表明，当裂缝端部连线与油藏边界夹角为23.2°、段间距为92.7 m、裂缝导流能力为15 D?cm时最优。根据研究结果进行了Y P 8井的压裂设计，压裂后初期日产液量22.66 m3、日产油量18.11 t ，投产至今生产基本稳定。研究结果表明，水平井分段压裂采用纺锤形布缝方式，可有效改善近井区域的渗流状况，获得较高的产能，并可均化油藏压力分布，防止过早水窜。
針對鄂爾多斯盆地緻密砂巖油藏五點法聯閤註採井網的特點，為實現儲層改造併控製水竄，對水平井分段壓裂的佈縫方式和裂縫參數進行瞭研究。基于水電相似原理，對聯閤註採井網不同壓裂方式進行瞭電模擬試驗，優選瞭壓裂方式及裂縫展佈形態；採用油藏數值模擬方法對分段壓裂的具體參數進行瞭優化。電模擬試驗結果錶明，分段壓裂比傳統雙翼壓裂的低壓區麵積增大36.4％、產能提高72.5％，紡錘形佈縫方式最適于五點法聯閤註採井網；油藏數值模擬結果錶明，噹裂縫耑部連線與油藏邊界夾角為23.2°、段間距為92.7 m、裂縫導流能力為15 D?cm時最優。根據研究結果進行瞭Y P 8井的壓裂設計，壓裂後初期日產液量22.66 m3、日產油量18.11 t ，投產至今生產基本穩定。研究結果錶明，水平井分段壓裂採用紡錘形佈縫方式，可有效改善近井區域的滲流狀況，穫得較高的產能，併可均化油藏壓力分佈，防止過早水竄。
침대악이다사분지치밀사암유장오점법연합주채정망적특점，위실현저층개조병공제수찬，대수평정분단압렬적포봉방식화렬봉삼수진행료연구。기우수전상사원리，대연합주채정망불동압렬방식진행료전모의시험，우선료압렬방식급렬봉전포형태；채용유장수치모의방법대분단압렬적구체삼수진행료우화。전모의시험결과표명，분단압렬비전통쌍익압렬적저압구면적증대36.4％、산능제고72.5％，방추형포봉방식최괄우오점법연합주채정망；유장수치모의결과표명，당렬봉단부련선여유장변계협각위23.2°、단간거위92.7 m、렬봉도류능력위15 D?cm시최우。근거연구결과진행료Y P 8정적압렬설계，압렬후초기일산액량22.66 m3、일산유량18.11 t ，투산지금생산기본은정。연구결과표명，수평정분단압렬채용방추형포봉방식，가유효개선근정구역적삼류상황，획득교고적산능，병가균화유장압력분포，방지과조수찬。
In order to achieve reservoir stimulation and control water breakthrough ,research was con‐ducted on hydraulic fracturing patterns and fracture parameters of horizontal well staged fracturing accord‐ing to the characteristics of five‐spot injection‐production well pattern for a tight sandstone oil reservoir in the Ordos Basin .Hydroelectric simulation was conducted on fracturing methods for the pattern ,and then the optimal fracturing method and fracture pattern were selected .The specific parameters of staged hydrau‐lic fracturing were optimized using reservoir numerical simulation methods .Hydroelectric simulation showed that staged fracturing would increase the low‐pressure area by 36.4 % and would increase produc‐tivity by 72.5 % in comparison with traditional dual‐wing fracturing ,and the spindle‐shaped fracture pattern was most suitable for five‐spot injection‐production pattern .The best values were obtained when the angle between res‐ervoir boundary and the fracture toes trend ,fracture spacing and fracture conductivity were 23.2° ,92.7 m and 15 D?cm respectively .Study results were used as reference for the fracturing design of Well YP 8 which had a‐chieved goods results ,with daily fluid production of 22.66 m3 and oil production of 18.11 t ,with stable production until the time of the writing of the results .The results showed that spindle‐shaped fracture pattern would achieve bet‐ter near‐wellbore region seepage conditions ,would result in higher production and would prevent water channeling .
