多缝压裂新技术研究与试验.pdf

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1、第32卷第2期石油钻采工艺V01．32No．22010年3月0ILDRILLING&PR0DUCT10NTECHN0L0GYMar．2010文章编号：1000—7393(2010)02—0071—04多缝压裂新技术研究与试验唐梅荣赵振峰李宪文赵文(长庆油田公司油气工艺研究院，陕西西安710021)摘要：受到注采井网和压裂工艺双重限制，单纯增加缝长来提高超低渗透油藏产量效果已不明显，为此提出了定向射孔多缝压裂技术思路，通过定向射孔诱导定向起裂，迫使初始裂缝转向，最终形成相互独立的多缝，进一步提高油层横向动用程度，扩大泄油面积。通过物模研究，认识到射孔方位和水平应

2、力差是影响多缝形成的关键因素，在此认识上，优化了压裂工艺。华庆地区现场试验2口井，通过净压力拟合和微地震裂缝监测等手段分析，初步证实层内形成了独立多缝。投产初期，试验井相比邻井井均日增油0．91t(增幅约26％)，实践证明通过多缝压裂提高泄油面积可以达到增产的目的。关键词：超低渗透油藏；定向射孔；裂缝转向；多裂缝；泄油面积中图分类号：TE357．1文献标识码：AStudyandtestonthenewtechnologyofmulti-fracturefracturingTANGMek0ng，ZHA0Zhenfeng，LIXianwen，ZHA0Wen(Cha

3、ngqingOilfieMCompanyOil＆GasTechnologyResearchInstitute．NationalEngineeringLaboratoryofTightOil＆GasFieldExplorationandDevelopment,Xi'an710021，China)Abstract：Duetotherestrictionoffloodingpaaemsandfracturingtechnologies，itisnotdistincttoincreasetheoutputofsuper-lowpermeabilityreservoir

4、inChangqingOilfieldonlybyincreasingfracturelength．Enlightenedbythefactthatthedirectionalperforatingcanreducethepressureofrockfracturing，thenewtechnologyofdirectionalperforatingandmulti—fracturefracturingisfirstlybroughtforward．Thistechnologyimproveshorizontalproductivedegreeofoillay

5、erandenlargesthedrainageareathroughdirectionallyper-foratingtoinduceorientedextension，forcinginitialfracturingtochange，andfinallyformingindependentmulti-fracturing．Throughthestudyofentitymodel，itisrecognizedthatperforatingazimuthandhorizontalstressdiferencearethekeyfactorsthatafectt

6、heformationofmultifractures．Basedonthisrecognition，fracturingtechnologyisoptimized．TwowellsweretestedonthespotinHuaqingarea．Itisapprovedinitiallythatindependentmultifractm'esisformedinsidelayersthroughtheanalysisonnetpressurematchingandmicroseismicfracmapping．Attheinitialproductions

7、tage，theaveragedailyoilproductionoftrialwellsincreasesby0．91tons(growingrateisabout26％)comparedwiththeadjacentwells．Thispracticeprovesthatproductioncanbeincreasedbyincreasingdrainageareathroughmulti—fracturefracturing．Keywords：super-lowpermeabilityreservoir；directionalperforating；fr

8、acturechange；multi—