A well-testing method for parameter evaluation of multiple fractured horizontal wells with non-uniform fractures in shale oil reservoirs

Meng, Meiling; Chen, Zhiming; Li, Xinwei; Wang, Junlei; Shi, Lumin

doi:10.26804/ager.2020.02.07

Cited by 46 publications

(16 citation statements)

References 12 publications

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“…With the increasing demand for oil production and the rapid depletion of conventional oil and gas resources, the development of unconventional oil and gas such as tight oil has attracted worldwide attention. Recent studies have shown that horizontal drilling and multistage hydraulic fracturing techniques are key means for tight oil development. − This has also been confirmed during the development of the Mahu oilfield in Xinjiang, China. The Mahu oilfield is the largest tight conglomerate reservoir in the world, with the tertiary petroleum reserves of 1.324 billion tons .…”

Section: Introductionmentioning

confidence: 87%

Integrated Simulation for Hydraulic Fracturing, Productivity Prediction, and Optimization in Tight Conglomerate Reservoirs

et al. 2021

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With the development of advanced horizontal drilling and multistage hydraulic fracturing techniques, the productivity of unconventional tight oil such as that found in the Baikouquan Formation of the Mahu Sag in the Junger Basin has been increasing. The Mahu oilfield is the largest tight conglomerate reservoir in the world. However, predicting the productivity of fractured horizontal wells in tight oil remains a challenge due to the high heterogeneity of the reservoir and complexity of its hydraulic fractures. Therefore, this study proposes a workflow for coupled geological modeling, along with fracturing and reservoir simulations in tight conglomerate reservoirs. Taking well block Ma131 as an example, a three-dimensional geological model is first built according to the results of geophysical research. The unconventional fracture modeling is used next to establish a fracturing simulation. Given the lack of natural fractures and the high concentration of conglomerate in the study area, the method of the multiple groups of microscale natural fractures is used to simulate the impact of gravel on fracture propagation. The feasibility of the method is verified with microseismic monitoring data and treating curves. Thereafter, an unstructured grid and the INTERSECT reservoir simulator are used to simulate the production performance of horizontal wells. The stress sensitivity effect of the rock matrix and fractures and the changes in the formation flow field caused by fracturing are considered in the reservoir simulation. Hydraulic fractures are found to be unable to form complex fracture networks easily under the conditions of high stress difference, high gravel content, and undeveloped natural fractures. However, they show the characteristics of macroscopic simplicity and local branching. Reducing cluster spacing can increase the complexity of hydraulic fractures and the productivity of horizontal wells. Finally, the proposed integrated simulation process is used to optimize well spacing, fracturing stimulation parameters, and the production system. Overall, the study serves as a guide for maximizing the production and economic benefits of tight conglomerate reservoirs.

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Section: Introductionmentioning

confidence: 87%

Integrated Simulation for Hydraulic Fracturing, Productivity Prediction, and Optimization in Tight Conglomerate Reservoirs

et al. 2021

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“…The previous research fully demonstrated the influence of the fracture network on reservoir flow and made a preliminary description of fracture network (Li, 2020). However, the distribution of fracture network cannot describe by a simple approach, such as analytical equations (Meng et al, 2020). The complex fracture network was formed based on communicating and extending natural fractures (Li et al, 2020), so the fracture network structure is consistent with the distribution of natural fractures in the reservoir.…”

Section: Introductionmentioning

confidence: 99%

Description of Fracture Network of Hydraulic Fracturing Vertical Wells in Unconventional Reservoirs

Liu

Sheng

2021

Front. Earth Sci.

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Based on the distribution of complex fractures after volume fracturing in unconventional reservoirs, the fractal theory is used to describe the distribution of volume fracture network in unconventional reservoirs. The method for calculating the fractal parameters of the fracture network is given. The box dimension method is used to analyze a fracturing core, and the fractal dimension is calculated. The fractal index of fracture network in fracturing vertical wells are also firstly calculated by introducing an analysis method. On this basis, the conventional dual-media model and the fractal dual-media model are compared, and the distribution of reservoir permeability and porosity are analyzed. The results show that the fractal porosity/permeability can be used to describe the reservoir physical properties more accurately. At the same time, the flow rate calculating by conventional dual-media model and the fractal dual-media model were calculated and compared. The comparative analysis found that the flow rate calculated by the conventional dual-media model was relatively high in the early stage, but the flow rate was not much different in the later stage. The research results provide certain guiding significance for the description of fracture network of volume fracturing vertical well in unconventional reservoirs.

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“…At present, this technology has been widely used in the Shengli oilfield, Sichuan Basin tight gas reservoirs, and Ordos Basin tight oil and gas reservoirs and achieved good results. For example, after channel fracturing in tight oil and gas reservoirs in the Ordos Basin, China, oil well production is 2.4 times that of conventional fracturing, and gas well production is 4-5 times that of conventional fracturing [12][13][14][15][16][17][18]. Therefore, channelfracturing technology has a broad application prospect in unconventional oil and gas development.…”

Section: Introductionmentioning

confidence: 99%

Study on the Deformation and Stability of Proppant Column in High-Conductivity Channel Fracturing

2022

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The nonlinear constitutive model of the proppant column was established through laboratory experiments on the stability of the proppant column. Based on reservoir geomechanics and the finite element method, a fracture-proppant column interaction model was established for high-conductivity channel fracturing. The effects of in situ stress, reservoir rock elastic parameters, and spatial distribution characteristics of the proppant column on the closure deformation of the high-conductivity fracture channel and the stability of the proppant column were studied. The higher the in situ stress, the higher the contact stress on the rock plate; the lower the height and the larger the diameter of the proppant column, the more prone to deformation and breakage, while the more the effective support decreases with the increase of the in situ stress. Under the condition of constant in situ stress, with the increase of the reservoir elastic modulus, the relative axial displacement of the two slabs decreases gradually, the effective propping ratio of fractures increases, and the reservoir elastic modulus has little effect on the stability of the proppant column. The effective propping ratio decreases with the increase of the proppant column diameter, increases with the increase of the proppant column height, and increases with the increase of the ratio of the reservoir elastic modulus to in situ stress. When the proppant column diameter (proppant column spacing) is less than 3 m, the effective propped fracture ratio increases significantly. Through the above research, the optimal proppant cluster diameter was finally optimized.

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A well-testing method for parameter evaluation of multiple fractured horizontal wells with non-uniform fractures in shale oil reservoirs

Cited by 46 publications

References 12 publications

Integrated Simulation for Hydraulic Fracturing, Productivity Prediction, and Optimization in Tight Conglomerate Reservoirs

Integrated Simulation for Hydraulic Fracturing, Productivity Prediction, and Optimization in Tight Conglomerate Reservoirs

Description of Fracture Network of Hydraulic Fracturing Vertical Wells in Unconventional Reservoirs

Study on the Deformation and Stability of Proppant Column in High-Conductivity Channel Fracturing

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