石油钻探技术
石油鑽探技術
석유찬탐기술
PETROLEUM DRILLING TECHNIQUES
2014年
1期
33-36
,共4页
邹德永%赵建%郭玉龙%方满宗%管申
鄒德永%趙建%郭玉龍%方滿宗%管申
추덕영%조건%곽옥룡%방만종%관신
渗透性漏失%漏失压力%高渗透地层%钻井液%数学模型%崖城13-1-A15井
滲透性漏失%漏失壓力%高滲透地層%鑽井液%數學模型%崖城13-1-A15井
삼투성루실%루실압력%고삼투지층%찬정액%수학모형%애성13-1-A15정
permeable loss%leak-off pressure%high permeability formation%drilling fluid%mathematical model%Well YC13-1-A15
为了预测渗透性砂岩地层的漏失压力,提高钻井的安全性。根据塑性流体的本构方程和毛细管渗流理论,分析了钻井液(宾汉流体)在井壁泥饼带、地层侵入带和原地层孔隙中的流动特性,分别建立了井壁有无泥饼2种情况下的渗漏压力计算模型。利用建立的数学模型,对崖城131 A15井压力衰竭储层段的漏失压力进行了预测,结果表明:井壁上未形成泥饼时,漏失压力当量密度为0.613 kg/L ;井壁上形成厚度1 mm、渗透率小于4×10-5 D的泥饼时,漏失压力当量密度可提高到1.21 kg/L以上。崖城131 A15井钻井施工中,采用密度1.10 kg/L的抗高温Versaclean油基钻井液,没有发生井漏。建立的渗透性砂岩地层漏失压力预测模型,可为渗透性砂岩地层安全钻井提供参考。
為瞭預測滲透性砂巖地層的漏失壓力,提高鑽井的安全性。根據塑性流體的本構方程和毛細管滲流理論,分析瞭鑽井液(賓漢流體)在井壁泥餅帶、地層侵入帶和原地層孔隙中的流動特性,分彆建立瞭井壁有無泥餅2種情況下的滲漏壓力計算模型。利用建立的數學模型,對崖城131 A15井壓力衰竭儲層段的漏失壓力進行瞭預測,結果錶明:井壁上未形成泥餅時,漏失壓力噹量密度為0.613 kg/L ;井壁上形成厚度1 mm、滲透率小于4×10-5 D的泥餅時,漏失壓力噹量密度可提高到1.21 kg/L以上。崖城131 A15井鑽井施工中,採用密度1.10 kg/L的抗高溫Versaclean油基鑽井液,沒有髮生井漏。建立的滲透性砂巖地層漏失壓力預測模型,可為滲透性砂巖地層安全鑽井提供參攷。
위료예측삼투성사암지층적루실압력,제고찬정적안전성。근거소성류체적본구방정화모세관삼류이론,분석료찬정액(빈한류체)재정벽니병대、지층침입대화원지층공극중적류동특성,분별건립료정벽유무니병2충정황하적삼루압력계산모형。이용건립적수학모형,대애성131 A15정압력쇠갈저층단적루실압력진행료예측,결과표명:정벽상미형성니병시,루실압력당량밀도위0.613 kg/L ;정벽상형성후도1 mm、삼투솔소우4×10-5 D적니병시,루실압력당량밀도가제고도1.21 kg/L이상。애성131 A15정찬정시공중,채용밀도1.10 kg/L적항고온Versaclean유기찬정액,몰유발생정루。건립적삼투성사암지층루실압력예측모형,가위삼투성사암지층안전찬정제공삼고。
In order to predict leak-off pressure in high-permeability sandstone formations and ensure drilling safety ,through analysis of the flow characteristics of drilling fluid in mud cake zone ,invaded zone and in-situ pores ,two calculation models for predicting leak-off pressure were established ,with or without mud cake on wellbore ,according to the constitutive equation of plastic fluid and capillary percolation theo-ry .The leak-off pressure of Well Yacheng 13 1 A15 was predicted by this model ,the results indicate that leak-off pressure equivalent density was 0.613 kg/L in the case of no mud cake on the wellbore ;the leak-off pressure equivalent density was 1.21 kg/L when mud cake formed on the wellbore with the thickness of 1 mm and permeability was less than 4 × 10-5 D .Lost circulation did not occur in the drilling of Well Yacheng 13 1 A15 through adoption of Versaclean high temperature oil-based plugging drilling fluids with a density of 1.10 kg/L .The prediction model for leak-off pressure could provide a theory basis for safe drilling in high-permeability sandstone formations .