Feasibility Analysis of Fractured-Horizontal Well Development in HuaQing Ultra-Low Permeability Reservoir

2013 ◽  
Vol 772 ◽  
pp. 755-760
Author(s):  
Shao Yuan Mo ◽  
Shun Li He ◽  
Shuai Wang ◽  
Hai Yong Zhang ◽  
Li Jing Chang ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Oil Field ◽  
Low Permeability ◽  
Geological Model ◽  
Reservoir Properties ◽  
Fracture Spacing ◽  
Low Permeability Reservoir ◽  
Horizontal Length ◽  
Fractured Horizontal Well ◽  
Half Length

Fractured-horizontal well can effectively reduce the percolation resistance near wellbore, improve the fluid mobility and enhance the production. However, in Chang 6 ultra-low permeability reservoir, BaiBao block, HuaQing oilfield, the efficiency of fractured-horizontal well is highly poor due to the production swiftly down and water cut sharply up. For studying the unsatisfying oil development by fractured-horizontal well in HuaQing oil field, the evaluation of reservoir properties and the option of stratum for fractured-horizontal well application have been performed based on the practical geological model of BaiBao block in HuaQing oil field. The numerical simulation is used to study the effect of reservoir permeability, Thickness and Aeolotropism on the production and to optimize the horizontal length, fracture spacing, half length and conductivity. The conclusion shows that Chang 63 stratum is qualified for fractured-horizontal well application. Through the practical geological model, the optimizations of horizontal length range, fracture spacing, half length and conductivity are 800m to 1200m, 77m, 150m, and 15μm2cm, respectively. The results can be conducted for fractured-horizontal well application in HuaQing oil field.

Research on Horizontal Well Hydraulic Fracture Crack Initiation Law of Low Permeability Reservoir

2014 ◽  
Vol 670-671 ◽  
pp. 728-731
Author(s):  
Su Ling Wang ◽  
Ying Zhang ◽  
Guo Feng Zhao ◽  
Si Qi Wang ◽  
Shan Ren Zhang
Keyword(s):  
Numerical Simulation ◽  
Crack Initiation ◽  
Hydraulic Fracture ◽  
Horizontal Well ◽  
Damage Mechanics ◽  
Influence Factor ◽  
Low Permeability ◽  
Construction Technology ◽  
Low Permeability Reservoir ◽  
Initiation Pressure

Horizontal well hydraulic fracture construction technology has already become the main development means of low permeability reservoir, and the crack initiation pressure is a key factor in fracture construction. Taking ABAQUS as the platform, combined with rock mechanics, elastic mechanics, fracture mechanics, damage mechanics and fluid-solid coupling theory, to establish horizontal well mechanical model, crack initiation law of horizontal well under different conditions were obtained by using finite element method. According to the horizontal well fracture tested data in Daqing peripheral oil fields, the crack initiation pressure and numerical simulation results are in good agreement, it shows that the numerical simulation method is reasonable, then analyze influence factor of crack initiation pressure on the basis.

Control Factors of Chang 4+5 Reservoir Properties in Jiyuan Oilfield

2013 ◽  
Vol 734-737 ◽  
pp. 1171-1174
Author(s):  
Qi Zhou ◽  
Yan Yi Yin
Keyword(s):  
Sedimentary Facies ◽  
Low Permeability ◽  
Reservoir Properties ◽  
Delta Front ◽  
Factors Affecting ◽  
Low Permeability Reservoir ◽  
Fine Grained ◽  
Control Factors ◽  
Critical Technology ◽  
Storage Potential

Discovered in recent years, Chang 4+5 reservoir group of Yanchang Formation in Jiyuan area is ultra-low permeability reservoir. The evaluation and prediction of the reservoir is the most critical technology in reservoir development. Comprehensive analysis with multiple research approaches shows that the storage potential of the ultra-low permeability reservoir is jointly controlled by sedimentation and diagenesis. Sedimentary factor includes lithology and sedimentary facies, two basic factors affecting the storage potential. The reservoir lithology is of fine-grained debris-arkose and miliary arkose. Pore types are mainly intergranular pores and dissolved pores. The sandstone microfacies in the delta front underwater distributary channel has the best storage potential. Diagenetic factors, including diagenesis types, evolution, intensity, combination etc., have direct influence on the reservoir storage potential. Compaction and calcite cementation are the main factors that weaken the storage potential, whereas carbonate dissolution, especially the dissolution of feldspar plays an important role in the improvement of the storage potential.

Experimental Research on Electric Analogy of Staged Fracturing of Horizontal Wells Flooding

2014 ◽  
Vol 955-959 ◽  
pp. 3484-3488
Author(s):  
Guang Zhong Lv ◽  
Jiang Qiao Zhang
Keyword(s):  
Horizontal Well ◽  
Horizontal Wells ◽  
Experimental Conditions ◽  
Horizontal Section ◽  
Fracture Length ◽  
Unidirectional Flow ◽  
Horizontal Length ◽  
Fractured Horizontal Well ◽  
Well Pattern ◽  
Penetration Ratio

An electrolytic simulation experiment was designed according to the water and electricity resembling principle. The pressure contour distribution and the effects of the productivity of the fractured horizontal well were experimentally studied under the flooding. The equal pressure lines around horizontal wells were elliptic, and the equal pressure lines were Parallelled distribution in the fracture of horizontal well, Flow states was unidirectional flow, indicating staged fracturing of horizontal well by improving Percolation way greatly reduce seepage resistance. Under the experimental conditions, staged fracturing horizontal waterflooding development best combination of parameters: row and staggered well pattern, penetration ratio of horizontal section was 0.8, the number of fractures should be 6 (fracture space was 91m), penetration ratio of fracture was 0.25, the angle between the fracture and horizontal well is 90 degree. The importance ranking of productivity was horizontal length, the number of fractures (fracture space ),fracture length, he angle between the fracture and horizontal well and well-pattern type.

Low Permeability Reservoir Quantitative Analysis of Diagenesis Evolution - Taking Xishanyao Reservoir in Niuquanhu Area as an Example

2015 ◽  
Vol 1092-1093 ◽  
pp. 1410-1415
Author(s):  
Yuan Kang ◽  
Wei Sun ◽  
Ting Shang ◽  
Jian Chao Shi ◽  
Jun Sheng
Keyword(s):  
Quantitative Analysis ◽  
Physical Property ◽  
Low Permeability ◽  
Reservoir Properties ◽  
Thin Sections ◽  
Low Permeability Reservoir ◽  
Quantitative Calculation ◽  
Pore Evolution ◽  
Calculation Results ◽  
The Impact

The Xishanyao reservoir in Niuquanhu area is a typical low permeability reservoir Diagenesis is very important for the physical property of reservoir. Through analyzed data of cast thin sections and scanning electron microscopy (SEM) data, analyzed the impact of main diagenesis on reservoir properties in Niuquanhu area. First, quantitative analyzed the various types of diagenesis on reservoir porosity contribution rate. Second, through restoring the original porosity, quantitative analyzed the pore evolution of reservoir caused by various types of diagenesis. Realized the quantitative analysis of porosity of each diagenesis stage. The quantitative calculation results agree well with the experimental analysis results, the error is 1.09%~1.51%, which showed the rationality of research method and the research results have certain reliability. The study of diagenesis has important significance for fine evaluation and favorable area prediction of Niuquanhu area reservoir.

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