Experimental evaluation of live oil oxidation together with its physical properties during air injection in a tight oil reservoir

Fuel ◽  
2021 ◽  
Vol 283 ◽  
pp. 119121
Author(s):  
Guangfeng Liu ◽  
Tenghuan Zhang ◽  
Qichao Xie ◽  
Wantao Liu ◽  
Lianhe Wang ◽  
...  
Keyword(s):  
Physical Properties ◽  
Experimental Evaluation ◽  
Air Injection ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Oil Oxidation ◽  
Tight Oil Reservoir ◽  
Live Oil

scholarly journals Tight oil reservoir production characteristics developed by CO2 huff ‘n’ puff under well pattern conditions

2022 ◽  
Author(s):  
Zhizeng Xia ◽  
Xuewu Wang ◽  
Rui Xu ◽  
Weiwei Ren
Keyword(s):  
Physical Properties ◽  
Oil Recovery ◽  
Oil Reservoirs ◽  
Injection Timing ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Natural Energy ◽  
Tight Oil Reservoir ◽  
Tight Oil Reservoirs ◽  
Production Characteristics

AbstractTight oil reservoirs have poor physical properties, and the problems including rapid oil rate decline and low oil recovery degree are quite common after volume fracturing. To obtain a general understanding of tight oil reservoir production improvement by CO2 huff ‘n’ puff, the high-pressure physical properties of typical tight oil samples are measured. Combining the typical reservoir parameters, the production characteristics of the tight oil reservoir developed by the CO2 huff ‘n’ puff are numerically studied on the basis of highly fitted experimental results. The results show that: (1) during the natural depletion stage, the oil production rate decreases rapidly and the oil recovery degree is low because of the decrease in oil displacement energy and the increase in fluid seepage resistance. (2) CO2 huff ‘n’ puff can improve the development effect of tight oil reservoirs by supplementing reservoir energy and improving oil mobility, but the development effect gradually worsens with increasing cycle number. (3) The earlier the CO2 injection timing is, the better the development effect of the tight reservoir is, but the less sufficient natural energy utilization is. When carrying out CO2 stimulation, full use should be made of the natural energy, and the appropriate injection timing should be determined by comprehensively considering the formation-saturation pressure difference and oil production rate. The research results are helpful for strengthening the understanding of the production characteristics of tight oil reservoirs developed by CO2 huff ‘n’ puff.

Hydraulic Fracturing of Ultrahigh Stress Tight Oil Reservoir - A Case Study of Yumen Oilfield in China

2016 ◽  
Author(s):  
Peng Yi ◽  
Weng Dingwei ◽  
Xu Yun ◽  
Wang Liwei ◽  
Lu Yongjun ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Tight Oil Reservoir

scholarly journals Fine Geological Modeling of the Tight Oil Reservoir

2015 ◽  
Vol 89 (s1) ◽  
pp. 65-66
Author(s):  
Hongru LIANG ◽  
Shuangfang LU ◽  
Mingming TANG ◽  
Bihui YAN ◽  
Shan SHEN
Keyword(s):  
Tight Oil ◽  
Oil Reservoir ◽  
Geological Modeling ◽  
Tight Oil Reservoir

scholarly journals Simulation of Counter-Current Imbibition in SRVs of Tight Oil Reservoir

2018 ◽  
Vol 6 (4) ◽  
pp. 339-343
Author(s):  
Zhongyi Xu ◽  
◽  
Linsong Cheng ◽  
Renyi Cao ◽  
Sidong Fang
Keyword(s):  
Tight Oil ◽  
Oil Reservoir ◽  
Tight Oil Reservoir ◽  
Counter Current

The Performance Evaluation of Old Well after SRV in Ordos Basin Tight Oil Reservoir

2014 ◽  
Author(s):  
H.. Wang ◽  
X.. Liao ◽  
H.. Ye ◽  
X.. Zhao ◽  
C.. Liao ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Ordos Basin ◽  
Fracture Network ◽  
Water Flooding ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Well Test ◽  
Stimulated Reservoir Volume ◽  
Tight Oil Reservoir ◽  
Volume Fracturing

Abstract The technology of Stimulated reservoir volume (SRV) has been the key technology for unconventional reservoir development, it can create fracture network in formation and increase the contact area between fracture surface and matrix, thus realizing the three-dimensional stimulation and enhancing single well productivity and ultimate recovery. In China, the Ordos Basin contains large areas of tight oil reservoir with the porosity of 2~12 % and permeability of 0.01~1 mD. The most used development mode is conventional fracturing and water flooding, which is different from the natural depletion mode in oversea, but the development effect is still unfavorable. The idea of SRV is proposed in nearly two years in Changqing Oilfield. SRV measures are implemented in some old wells in tight oil formation. It is a significant problem that should be solved urgently about how to evaluate the volume fracturing effect. Based on the real cases of old wells with SRV measures, the microseismic monitoring is used to analyze the scale of formation stimulation and the complexity of fracture network after volume fracturing; the numerical well test and production data analysis (PDA) are selected to explain the well test data, to analyze the dynamic data, and to compare the changes of formation parameters, fluid parameters and plane streamlines before and after volume fracturing; then the interpretation results of well test with the dynamic of oil and water wells are combined to evaluate the stimulation results of old wells after SRV. This paper has presented a set of screening criteria and an evaluation method of fracturing effect for old well with SRV in tight oil reservoir. It will be helpful to the selection of candidate well and volume fracturing operation in Ordos Basin tight oil reservoir. It should be noted that the evaluation method mentioned in the paper can be expanded to volume stimulation effect evaluation in other unconventional reservoirs, such as tight gas, shale gas and so on.

Production characteristics, evaluation and prediction of CO2 water- alternating-gas (WAG) flooding in tight oil reservoir

2021 ◽  
pp. 1-24
Author(s):  
Xiaolong Chai ◽  
Leng Tian ◽  
Mengyuan Zhang ◽  
Hongzhi Shao ◽  
Jianguo Wang ◽  
...  
Keyword(s):  
Influencing Factors ◽  
Comprehensive Evaluation ◽  
Injection Pressure ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Water Alternating Gas ◽  
Gas Flooding ◽  
Tight Reservoirs ◽  
Tight Oil Reservoir ◽  
Production Characteristics

Abstract It is complex and obviously different for the production characteristics of CO2 water- alternating-gas flooding in tight reservoir and influenced by many factors. Therefore, the production prediction is a key matter of efficient development of CO2 water- alternating-gas to be solved in tight reservoirs. In order to solve this problem, in this paper, the production characteristics of CO2 water- alternating-gas flooding production well are analyzed and classified in tight oil reservoir of Block A as an example. On this basis, geological, fracturing operation and development factors are considered and the sensitivity of the influencing factors was carried out. The grey relation analysis(GRA) was used to screen the main influencing factors of poduction and establish the poduction evaluation model to realize the rapid prediction production. The results show that the wells of CO2 water- alternating-gas flooding in tight reservoirs can be divided into four types. The production is affected by permeability, reservoir thickness, amount of sand entering the ground, amount of liquid entering the ground, gas/water ratio, injection rate and injection pressure, and the main influencing factors of production are amount of sand entering the ground, reservoir thickness and amount of liquid entering the ground. The production of oil can be predicted quickly based on the relation between production and comprehensive evaluation factor of production. The average relative error between the predicted results and the actual predicted production is 8%, which proves the reliability and accuracy of this method.

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