摘要
为有效解决沁水盆地煤层气井因岩性变化快而引发的漏失、坍塌、掉块等情况,通过室内研究及现场应用,采用绒囊钻井液能够有效解决上述问题.MBS26-11 防塌试验井和MBS24-5 防漏堵漏试验井钻遇地层多而复杂,邻井坍塌、漏失严重.MBS26-11 井二开采用绒囊钻井液,密度为0.95-1.05 g/cm^3,黏度为35-38 s,平均机械钻速10.79 m/h,比邻井钻速提高9.2%.钻进过程中无掉块、卡钻现象,顺利完钻.MBS24-5 井一开采用膨润土泥浆,漏失严重,漏失速率达6.95 m^3/h,采用绒囊钻井液后漏失速率为1.68 m^3/h.二开仍采用绒囊钻井液,密度保持0.93-0.98 g/cm^3,漏斗黏度在38 s 以上,塑性黏度6-14 mPa·s,动切力3.00-6.64 YP/Pa,动塑比保持在0.43-1.66Pa/mPa·s.平均机械钻速5.6 m/h.
According to the experiments and applications, it was proved that the Fuzzy-ball drilling fluid can effectively solve the leakoff, block and collapses induced by quickly changed lithology. MBS26-11 and MBS24-5 were two directional production wells in Qinshui Basin. The drilled layers were many and complex. And the lithology was alternated frequently. And in the second interval of MBS26-11, the clay-free fuzzy ball drilling fluid was used. The density covers from 0.95~1.05 g/cm3. The viscosity was from 35 to 38 seconds. The average ROP was 10.79 m/h which was 9.2% more than adjacent well. In the first interval of MBS24-5, by applying bentonite drilling fluid, the leakoff was severe and the loss rate was 6.95m3/h. Then, by using fuzzy-ball drilling fluid, the loss rate was controlled within 1.68m3/h. In the second interval, the clay-free fuzzy ball drilling fluid was also applied. The density of drilling fluid was 0.93 g/cm3 to 0.98 g/cm3 with the viscosity of above 38 seconds, the plastic viscosity of 6 to 14mPa·s, a yield value of 3.00 to 6.64YP/Pa and a ratio of dynamic to plastic viscosity of 0.43~1.66Pa/mPa·s. The average ROP was 5.6 m/h.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2016年第1期137-140,共4页
Coal Geology & Exploration
基金
国家科技重大专项课题(2011ZX05036-003)~~
关键词
沁水盆地
煤层气
岩性交替
钻井液
绒囊
防漏堵漏
防塌
Qinshui Basin
CBM
alternating lithology
drilling fluid
fuzzy-ball
prevention and blockage of Leakage
prevention of collapse
