检索结果-南通市图书馆

leak-off behavior and water shut-off performance of a polymer/chromium(Cr^(3+)) gel in fractured media

Journal of Central South University 2017年第6期24卷 1418-1429页

作者： LI Jun-jian XIONG Chun-ming BAI Ying-rui JIANG Ru-yi WEI Fa-lin ZHANG Miao College of Petroleum Engineering China University of Petroleum(Beijing) Research Institute of Petroleum Exploration & Development PetroChina Department of Science and Technology Management China National Petroleum Corporation

During gel treatments for fractures, the leak-off behavior of gelant has a great effect on the water shut-off performance of gel. Experiments were carried out using a polymer/chromium(Cr^(3+)) gel system to explore the leak-off behavior and the water shut-off performance of gel in fractured media. Results of the gelant leak-off study show that the gelant leak-off from fracture into matrix contributes to the formation of the gelant leak-off layer during the gelant injection. Moreover, because of the gradual formation of the gelant leak-off layer along fracture, the initial leak-off ratio of gelant is relatively high, but it declines and finally levels off with the increase of the injection volume. The polymer concentration of gelant has a great effect on the chromium output in fluids produced from fractures. With the increase of the polymer concentration, the chromium concentration first decreases and then increases, and the leak-off depth of gelant into matrix is gradually reduced. Results of the water shut-off study present that the decrease of the chromium concentration inside the fracture greatly reduces the water shut-off performance after the gel formation. Therefore, because of the relatively high degree of chromium leak-off, enough injection volume of gelant is essential to ensure the sufficient chromium concentration inside the fracture and to further achieve a favorable water shut-off performance. On the premise of gel strength assurance inside the fracture, the water shut-off performance of gel gradually declines with the extension of the distance from the fracture inlet, and different leak-off degrees of gelant along the fracture are responsible for this phenomenon. Therefore, a proper degree of gelant leak-off contributes to enhancing the water shut-off performance of gel for fractures.

关键词： polymer gelant gel leak-off water shut-off fracture

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

leak-off Mechanism and Pressure Prediction for Shallow Sediments in Deepwater Drilling

引用

Journal of Ocean University of China 2018年第1期17卷 65-71页

作者： TAN Qiang DENG Jingen SUN Jin LIU Wei YU Baohua State Key Laboratory of Petroleum Resources and Prospecting ChinaUniversity of Petroleum-Beijing Key Laboratory of Marine Georesources and Prospecting (Hainan Province) Institute of Deep-Sea Science and Engineering Chinese Academy of Science

Deepwater sediments are prone to loss circulation in drilling due to a low overburden gradient. How to predict the magnitude of leak-off pressure more accurately is an important issue in the protection of drilling safety and the reduction of drilling cost in deep water. Starting from the mechanical properties of a shallow formation and based on the basic theory of rock-soil mechanics, the stress distribution around a borehole was analyzed. It was found that the rock or soil on a borehole is in the plastic yield state before the effective tensile stress is generated, and the effective tangential and vertical stresses increase as the drilling fluid density increases; thus, tensile failure will not occur on the borehole wall. Based on the results of stress calculation, two mechanisms and leak-off pressure prediction models for shallow sediments in deepwater drilling were put forward, and the calculated values of these models were compared with the measured value of shallow leak-off pressure in actual drilling. The results show that the MHPS(minimum horizontal principle stress) model and the FIF(fracturing in formation) model can predict the lower and upper limits of leak-off pressure. The PLC(permeable lost circulation) model can comprehensively analyze the factors influencing permeable leakage and provide a theoretical basis for leak-off prevention and plugging in deepwater drilling.

关键词： deepwater drilling shallow sediments leak-off mechanism leak-off pressure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The effect of natural fracture on the fluid leak-off in hydraulic fracturing treatment

引用

Petroleum 2019年第1期5卷 85-89页

作者： Amir Ghaderi Jaber Taheri-Shakib Mohamad Amin Sharifnik National Iranian South Oil Company AhwazIran Research Institute of Petroleum Industry TehranIran

Fluid leak-off phenomenon plays a critical role in hydraulic fracturing *** phenomenon can be very impressive in successful operation of hydraulic *** operation is very complex in fractured reservoirs due to the reaction between induced fracture and natural *** this study with the cohesive element method,the effect of presence of natural fracture on the magnitude of hydraulic fracturing fluid leak-off is *** of all,cohesive element and extended finite element method methods are *** fluid flow inside hydraulic fracture and the affecting parameters on leak-off of this fluid on adjacent environment are ***,effects of natural fracture on hydraulic fracturing direction such as deviation,leak-off and the mutual influences(which includes the changes of stress regime around the natural fracture)and also changes in pore pressure are *** results indicate that presence of natural fracture will cause reduction in aperture of hydraulic *** decrease will lead to extension of fluid lag and eventually delaying of leak-off ***,this effect is negligible against the positive impact due to shear and normal displacement on increasing leak-off.

关键词： Hydraulic fracturing Natural fracture leak-off Interaction XFEM

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：