摘要
根据泵送式电缆射孔与可钻桥塞分段压裂联作工艺特点,建立电缆密封系统水力学模型和泵送过程中管串力学分析模型,推导电缆注脂密封压力控制方程、联作管串结构参数控制方程和泵送排量控制方程,并结合实例分析各泵送参数的控制方法和主要影响因素。以某低渗透储集层开发井为例,利用各控制方程,确定了泵送过程中井口注脂密封压力、联作管串最小质量与最大长度、泵送排量等关键参数的控制方法和合理范围,分析了井口压力、井身结构、电缆下放速度对泵送参数控制的影响。结果表明:随着井口压力的增加,要不断提高注脂泵排量以增大密封压力,同时联作管串应满足的最小质量也不断增大;随着狗腿度的增加,最大狗腿度处允许通过的管串最大长度减小;应保持泵送排量与电缆下放速度的协调变化。
According to the technological characteristics of the combination perforation and multistage fi＇acturing using drillable bridging plugs, both the hydrodynamics model of wireline sealing system and the mechanical model of toolstring running in the hole were developed. In these models, the equations governing the sealing pressure of grease injection, structure parameters of toostring and pump rate were established. Based on the presented models, the parameter control methods of pumping and their primary influence factors were investigated through case study. For a development well in low-permeability reservoir, the control methods and the reasonable ranges of grease injection sealing pressure, minimum weight and maximum length of toolstring and pump rate were defined using the control equations. The eft^cts of wellhead pressure, hole configuration and running velocity of wireline on parameter controlling were also analyzed. The results show that, with increasing wellhead pressure, the grease injection rate should be increased to improve sealing pressure, and the minimum weight of toolstring should also increase. Increasing the overall angle change rate could lead to a decrease of the maximum allowable length of the toolstring. The pump rate should be adjusted according to the running velocity of wireline.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2013年第3期371-376,共6页
Petroleum Exploration and Development
基金
国家科技重大专项(2011ZX02006-002)
关键词
水平井
分段压裂
电缆射孔
联作管串
泵送参数
可钻桥塞
低渗透储集层
horizontal well
multistage fracturing
wireline conveyed perforation
toolstring
pump parameter
drillable bridging plug
low-pemteability reservoir
