摘要
针对现有钻井过程中溢流检测方法无法检测微溢流量,对深井和复杂井井控提出挑战,展开了精细控压钻井溢流检测及模拟研究。研究中通过对比出入口微流量变化,提出了精细控压钻井溢流检测和分析方法;根据气液两相流理论,建立了井筒气侵期间流动计算模型。将该检测方法应用于塔中某井进行试验,结果表明:精细控压钻井系统溢流检测方法可以准确检测溢流的发生和累积溢流量;根据气液两相流模型,可以模拟精细控压钻井不同回压时井筒流动参数的变化;该检测方法在现场试验中检测结果和模拟结果一致。精细控压钻井系统溢流检测方法能够准确检测溢流发生,该检测方法具有可行性和可靠性,可对控压钻井发现和控制溢流提供了理论支持。
The current gas kick detection method cannot detect the trace of overflow,and thus we propose the overflow detection methods for managed pressure drilling（MPD） and establish the wellbore overflow calculation model based on the gas-liquid two-phase theory.A comparison of the simulation results with the measured date of MPD,reveals that it is difficult to detect the overflow quickly and accurately;overflow can be detected by comparing the in flow and out flow to determine the type of bottomhole complex trouble.If the out flow greater than the in flow,there may have overflow in the wellbore.When the gas flows out from reservoir over 1 000 m of wellbore,there may be expansion in the wellbore,and the gas void and out flow increase and the mud pit increases at the same time.But if the wellbore back pressure increase,the parameters increment may decline.The flow out results simulated by the computer coincide with the results measured by the MPD.The overflow detection by MPD can accurately find the kick,and the results of computer simulation is reliable in finding and controlling the overflow.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第5期128-132,共5页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家科技重大专项(2011ZX05021-003)
国家自然科学基金(51274221)
关键词
精细控压钻井
溢流检测
气液两相流
出口流量
模拟计算
managed pressure drilling
gas kick detection
gas-liquid two-phase flow
out flow
simulation and calculation
