Optimal Fracture Spacing of a Hydraulically Fractured Horizontal Wellbore to Induce Complex Fractures in a Reservoir Under High In-Situ Stress Anisotropy

2013 ◽  
Author(s):  
Hyunil Jo
Keyword(s):  
In Situ Stress ◽  
Fracture Spacing ◽  
Stress Anisotropy ◽  
High In Situ Stress ◽  
Complex Fractures ◽  
Horizontal Wellbore

scholarly journals High In Situ Stress Anisotropy Lead to Formation of Complex Fracture Patterns

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Xinjiang Yan ◽  
Zehao Zhang ◽  
Jifei Yu ◽  
Yanfeng Cao ◽  
Yanguang Yuan
Keyword(s):  
Stress Condition ◽  
Water Injection ◽  
In Situ Stress ◽  
Injection Rate ◽  
Geological Condition ◽  
Complex Fracture ◽  
Stress Anisotropy ◽  
Fracture Patterns ◽  
High In Situ Stress

During the process of water injection, due to solid particle deposition and foreign liquid intrusion, the formation near the wellbore was contaminated and blocked. As a result, water injection rate reduced and failed to meet the injection requirements. In order to improve water injection rate and improve oil recovery of offshore oilfields, hydraulic injection tests were carried out in controlled laboratory conditions. In general, the formation of complex fracture patterns is an ideal outcome of the hydraulic fracturing stimulation seeks to achieve. In situ stress condition is an inherited geological condition one can only adopt to. By comparing test results of different experiments that had varied stress and hydraulic injection conditions imposed, we can investigate their impact on the fracture patterns created. This paper presents laboratory evidences to support that if the hydraulic injection condition is managed properly, a complex fracture pattern is possible even under a high in situ stress anisotropy. Even if the in situ stress condition has a large anisotropy, proper hydraulic stimulation operations can still cause complex fracture patterns and thus provide good stimulation efficiency.

Experimental investigation on splitting failure of high sidewall cavern under three-dimensional high in-situ stress

2021 ◽  
Vol 108 ◽  
pp. 103725
Author(s):  
Qiangyong Zhang ◽  
Fan Li ◽  
Kang Duan ◽  
Guangyuan Yu ◽  
Lei Cheng ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Three Dimensional ◽  
In Situ Stress ◽  
High In Situ Stress ◽  
Splitting Failure

Study on Deformation and Damage of Rock Mass Subject to High In Situ Stress by Using a Elastoplastic Damage Model and Considering the Impact of Weak Planes

2013 ◽  
Vol 838-841 ◽  
pp. 705-709
Author(s):  
Yun Hao Yang ◽  
Ren Kun Wang
Keyword(s):  
Rock Mass ◽  
Large Scale ◽  
Damage Model ◽  
Back Analysis ◽  
In Situ Stress ◽  
Surrounding Rock ◽  
High In Situ Stress ◽  
Underground Caverns ◽  
The Impact

Large scale underground caverns are under construction in high in-situ stress field at Houziyan hydropower station. To investigate deformation and damage of surrounding rock mass, a elastoplastic orthotropic damage model capable of describing induced orthotropic damage and post-peak behavior of hard rock is used, together with a effective approach accounting for the presence of weak planes. Then a displacement based back analysis was conducted by using the measured deformation data from extensometers. The computed displacements are in good agreement with the measured ones at most of measurement points, which confirm the validities of constitutive model and numerical simulation model. The result of simulation shows that damage of surrounding rock mass is mainly dominated by the high in-situ stress rather than the weak planes and heavy damage occur at the cavern shoulders and side walls.

Research of Mining Method for Difficult-to-Mine Ore Bodies in Deep Mine

2014 ◽  
Vol 962-965 ◽  
pp. 1041-1046
Author(s):  
Qi Fa Ge ◽  
Xue Sen Sun ◽  
Wei Gen Zhu ◽  
Qing Gang Chen
Keyword(s):  
In Situ Stress ◽  
Mining Method ◽  
Deep Mining ◽  
Deep Mine ◽  
Ore Body ◽  
High In Situ Stress ◽  
Ore Bodies ◽  
Large Panel ◽  
Back Filling

There are many problems such as depth, high in-situ stress, high ground temperature and rockburst proneness etc. in deep mining. And it is an acknowledged and urgent mining technical puzzle about mining method of gently inclined and medium-thick ore bodies. For such an ore body in West wing of Dongguashan copper mine, if we use traditional mining method, it is hard to conquer such difficulties as high in-situ stress, large open area in roof, removal of mined ore by gravity etc. The theory of “large panel and lower sublevel height” will be easy to solve such problems. This paper use numerical technology to analyze and compare the technical and economical effectiveness for different selected mining method and its structure. The sublevel (at a height of 12 m) open stoping with back-filling by extraction in two steps is quite suitable for ensuring safety, increasing efficiency, productivity and reclaiming resource. The selected method is feasible and well worth spread.

Coring damage extent of rock cores retrieved from high in-situ stress condition: A case study

2017 ◽  
Vol 21 (7) ◽  
pp. 2946-2957 ◽  
Author(s):  
Peng Yan ◽  
Qi He ◽  
Wenbo Lu ◽  
Yanli He ◽  
Wei Zhou ◽  
...  
Keyword(s):  
Stress Condition ◽  
In Situ Stress ◽  
High In Situ Stress ◽  
Rock Cores ◽  
Damage Extent
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