超臨界CO_2連續油管鉆井可行性分析_沈忠厚.pdf

ócI|1000-0747201006-0743-05? “?CO2 ??25GY V??s沈忠厚, 王海柱, 李根生中國石油大學北京油氣資源與探測國家重點實驗室á[ “國家重點基礎研究發展規劃973項目2010CB226704;國家自然科學基金重點項目51034007K1超臨界 CO2 流體具有接近于氣體的低黏度和高擴散系數,同時具有接近于液體的高密度。與氮氣、空氣、液體、充氣液、泡沫等鉆井流體相比,超臨界CO2 流體的密度變化范圍較寬,這一特性使得超臨界 CO2 為井下馬達提供足夠扭矩的同時,還能保證井底的欠平衡狀態。即使超臨界CO2 流體侵入儲集層,也不會對其造成傷害,相反還能進一步增大儲集層孔隙度和滲透率,降低流動阻力,提高采收率。同時超臨界CO2 射流破巖速度較水射流快得多,而且破巖門限壓力也非常低,在利用連續油管進行超臨界CO2 噴射鉆井時,可大大降低連續油管鉆井系統的壓力,擴大連續油管的作業范圍,更適合小井眼、微小井眼、超短半徑水平井、復雜結構井等鉆井。超臨界CO2 連續油管鉆井將為鉆井帶來一次全新的技術創新,也將成為特殊油氣藏開發的高效鉆井技術。圖10表1參151oM連續油管;鉆井;超臨界CO2 ;可行性分析?ms ?|TE242.9 óDS M ?AFeasibility analysis of coiled tubing drilling with supercritical carbon dioxideShen Zhonghou, Wang Haizhu, Li GenshengState Key Laboratory of Petroleum Resource and Prospecting, ChinaUniversity of Petroleum, Beijing 102249, ChinaAbstractSupercritical CO2SC-CO2fluid has the properties of low viscosity and high diffusion capacity near to gas, andhigher density near to liquid.Compared with nitrogen, air, liquid, aerated fluid, foam and other drilling fluids, thesupercritical CO2 fluid has a wide range of density which can not only make it to generate enough torque to run a downholemotor, but also ensure the downhole in an underbalanced state while drilling.Even if the supercritical CO2 fluid invadesinto reservoir, the reservoir will not be polluted, on the contrary, it can increase the reservoir porosity and permeabilityfurther more, reduce flow resistance, and enhance production and recovery.Meanwhile, the rock broken speed ofsupercritical CO2 jet is faster than that of water jet and thethreshold pressureis loweralso.When the coiled tubing drillingwith supercritical CO2 takes place, it can significantly decrease the coiled tubing drilling system pressure and expand thecoiled tubing operating range, it is more suitable for slim hole, micro-hole, short radius horizontal wells, complexstructures wells and so on.The coiled tubing drilling with SC-CO2 will bring an innovation in the drilling technology, andwill become an efficient drilling technique for special reservoir development.Key wordscoiled tubing;drilling;supercritical carbon dioxide;feasibility analysis0?y??25GY/ ? 20 W90 M}á ?Z ?￥B[?? 、úr q￥GY/ ?, “ -X???¨? oYG、F 、§G[lY、 4 ü?、V ü?? ￡ üYGY??GYT 7￥ ?,Bt y2?? ?、 j°2 ??￥ 7GY4 ÷ú￥1 p,-  ? e?ù5。20 W C￥? “?CO2GY/ ?, μ? “?CO2 ¨  ?? êKa ??、 ?? ? y￥?,7 O? “?CO2 8 áM ú,Y?a ? ? e?,÷1￥ ?????ê ?“a,MQé ?“aa 9v“a 1iq,4úe2? l q[3, 4] ,yN?/ ?¤?   D 7 2010 M12 PETROLEUM EXPLORATION AND DEVELOPMENT Vol.37 No.6m1 CO2M ?m[ 6]? “? 8;?]? 8,9?]?A8, ? μ??￥t ??D?é。? “? 8￥ á¤í?A8, ?D??a ??dL?1“, ?a ? 6ú79v, ?? 6ú7hl,] H *D 8¤í, ? ?“?1A8v,yN ?￥. ￡、.é ?  7￥ Z,  7/?￥1 pD ° 9,? ? 8GYù? ?1 p,?? f ?/,20 W ù? “?CO2GY/ ??73。 i LV ü,? “?CO2  ?? êKa ??、?? ? y、1 ?? ?3 ￡ ?、? D ? T ?￥? F81l,?t??  GY?￥D 7· F2y? Vol.37 No.6 a ?￥M?9? ù?。7CO2 8, ?“a ?￥ 6ú,í ? A ?? ? “? ?, *M? dè üA,- V  ?M1A ? H*ClMnm5。??ú? “?? H, ?“a ?￥ 6úCO2?  ?M1? “? ?, *9?v9v, O ??M?, vlo?  ??A ?-W。?CO2￥ á?*? V?,? “?CO2 8*1? ? b *v, O á÷v,÷μ ??z?。?DèGYAM1, *?l¤, l￥ ?/L Vr??  ?,μ ??z?, O ?*?9 ???ìa{,V7??1 ? ?Y/y￥a ?1 p。3? “?CO2GYa ]??? “?CO2 8￥ á、*、 ? ??? y?é,? “?CO2GY μí/ ?a ]。3.1 ?? ? y, êKa ??úa ￡  ?êT¨?1μ b? ?êT¨、 ￡   T¨、 ￡  ?a ?T¨、 ￡  ? μ? ? ??êT¨[ ￡sT¨?, ??V???tT¨ V] H 39 V  3B [[ 8] 。? “?CO2  ??T¨ ?D ￡  ?? ? ? ?,? ??? “?CO2￥?*、 ? ???, P  ￡sT¨Z ?÷Fl。?m7 Vn, ￡  ?? H,úa ￡aμ￥T¨/_ ? ? ?,?? ??vMN H,?? * v、 ? ??9 l, °5 ?￥T¨/L?T?_- ?,  ￡ ? 9íE.??  ?, ? ￡  ￥ ?úLíE ? T? F。 ?7?? “?CO2 ? a,??? “?CO2*?l¤í 8, ? ??9 v,7 OV ?f ?1 ,,?i °5T¨,? “?CO2 8 é ?? ? v? s0￥ bW,   ¤?úr.?。yN? “?CO2 ¨  ??H,? “?CO2 8  ?1 1 ??  ?, P ? ? 8Dúa  8 óY1dB￥a ?8,9vT¨? F  V ? ￥a ?,V7?? ?? êKa ?,] H4ú ?? ?。m7 ￡  D? “?CO2  ??1Kollé?Marvin￥ù?2T]“9￡ ü ?B?[ 3,4] 。? “?CO2  ??￥ êKa ?v ??“?1 ￡  ?? êKa ?￥2/3,??11/2÷l。N?,?lj ¨ ￡ùGY L2TV ü,￡ O ??? ?¨? “?CO2T1GYA￥Gé ?¨ ￡ H￥3.3, ?? ?31 ?1¨ ￡ ?GY H￥20[4] 。m81¨? q1100 kW、°?150 mm￥GY 、?]oé ¨ GY1 L2T, ?G? F1￡ O ??。a ???124MPa H, ￡ ?  ? ??,7? “?CO2 ¨  ??￥μra ? ? V?à55 MPa[ 3] 。m8 ?]oé ¨ GY1 L2Tm[ 3]3.2μr 1“a,4úe2? l q?Y ￡GYA?cμv ￥M R ì,u 7“a H,aa?
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