資源描述:
《頁(yè)巖氣儲(chǔ)層鉆井液損害評(píng)價(jià)研究.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、第43卷第7期探礦工程(巖土鉆掘工程)Vo1.43No.72016年7月ExplorationEngineering(Rock&SoilDrillingandTunneling)Ju1.2016:107—110頁(yè)巖氣儲(chǔ)層鉆井液損害評(píng)價(jià)研究李紅梅,趙毅,馬振鋒,景豐(陜西延長(zhǎng)石油(集團(tuán))有限責(zé)任公司研究院,陜西西安710075)摘要:延長(zhǎng)油田頁(yè)巖氣儲(chǔ)層埋藏較深,地質(zhì)條件復(fù)雜,頁(yè)理構(gòu)造發(fā)育,巖石物性極差,頁(yè)巖易膨脹、分散。由于孑L縫并存,頁(yè)巖氣儲(chǔ)層比砂巖油藏具有更嚴(yán)重的微粒運(yùn)移損害、儲(chǔ)層應(yīng)力敏感損害、水鎖損害等特性。鑒于延長(zhǎng)頁(yè)巖儲(chǔ)層太過(guò)致密
2、,不能用常規(guī)方法進(jìn)行滲透率測(cè)定。通過(guò)采用人造裂縫法測(cè)定鉆井液對(duì)儲(chǔ)層裂縫的污染程度來(lái)表征鉆井液對(duì)儲(chǔ)層的損害率。經(jīng)人造裂縫法測(cè)定,延長(zhǎng)油田現(xiàn)場(chǎng)使用的白油基鉆井液體系對(duì)頁(yè)巖氣儲(chǔ)層的污染滲透率恢復(fù)率達(dá)到91.060%,初步證實(shí)該體系具有良好的儲(chǔ)層保護(hù)效果,可在延長(zhǎng)油田進(jìn)一步推廣使用并驗(yàn)證。關(guān)鍵詞:頁(yè)巖氣水平井;儲(chǔ)層損害;滲透率測(cè)試;人造裂縫;白油基鉆井液中圖分類(lèi)號(hào):P634.6;TE258文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1672—7428(2016)07—0107—04StudyonDrillingFluidsFormationDamageofShal
3、eGasWell/L/Hong—mei,ZHAOYi,MAZhen-feng,JINGFeng(ResearchInstituteofYanchangPetroleum(Group)Co.,Ltd.,Xi’anShaanxi710075,China)Abstract:Yanchangoilfieldshalegasreservoirisdeeplyburiedwithcomplexgeologicalconditions,f0liationstructurede—velopment.poorphysicalpropertiesofroc
4、kandshaleeasilyexpansesanddisperses.Becauseof山ecoexistenceofporesandcracks,thecharacteristicsoftheshalereservoirareworsethanthesandstoneoilreservoir,suchastheparticlemove—mentdamage,reservoirstresssensitivitydamage。waterblockingdamageandSOon.InviewofYanchangoilshalereser
5、voiristoodense.thepermeabilitymeasuringcannotbemadebyconventionalmethods.Theartificialfracturemetl1odwasusedtodeterminethepollutiondegreeofdrillingfluidtocharacterizethedamagerateofdrillingfluidstothereservoir.Measuredbvtheartificialfracturemethod.thereturnpollutionperme
6、abilityrateisupto91.060%withtheuseofwhiteoil-baseddril1ingfluidssysteminYanchangoilfield.ItispreliminarilyconfirmedthatthisdrillingfluidssystemhasgoodeffectinreservoirprotectionandcallbefurtherpromotedandusedinYanchangoilfield.Keywords:horizontalshalegaswell;reservoirdam
7、age;permeabilitytest;artificialcrack;whiteoil—baseddrillingfluid1頁(yè)巖儲(chǔ)層損害特殊性研究(2)侵入裂縫性頁(yè)巖儲(chǔ)層的固相、裂縫中微粒延長(zhǎng)油田頁(yè)巖氣儲(chǔ)層一般賦存于源巖及與源巖運(yùn)移造成的損害更嚴(yán)重;互層共生或緊鄰的致密儲(chǔ)集層的納米級(jí)孔隙中,其(3)裂縫性?xún)?chǔ)層應(yīng)力敏感損害嚴(yán)重;埋藏較深,地質(zhì)條件復(fù)雜,頁(yè)理構(gòu)造發(fā)育,具有層理(4)外來(lái)流體殘?jiān)鼘?dǎo)致裂縫堵塞;和天然裂隙等薄弱面,巖石物性極差。頁(yè)巖儲(chǔ)(5)初始水飽和度很低時(shí)將引起十分嚴(yán)重的水集空間與致密氣砂巖有著本質(zhì)不同,相對(duì)于砂巖儲(chǔ)鎖
8、損害;層,頁(yè)巖儲(chǔ)層近井地帶儲(chǔ)層傷害機(jī)理具有顯著的力(6)鈣、鎂離子更多地存在于裂縫性頁(yè)巖儲(chǔ)層學(xué)、化學(xué)耦合的敏感特性。頁(yè)巖易膨脹、分散,鉆井的地層水中,人井液體與地層水之間存在流體不配液侵入微裂縫將引起儲(chǔ)層不