Well pattern optimization and arrangement method of well spacing simulation

2015 ◽  
pp. 743-748
Keyword(s):  
Well Spacing ◽  
Well Pattern ◽  
Well Pattern Optimization

Well Pattern Optimization Design for CBM Development

2014 ◽  
Vol 881-883 ◽  
pp. 1225-1229
Author(s):  
Gang Zhao ◽  
Shu Heng Tang ◽  
Xiao Fei Jian
Keyword(s):  
Optimization Design ◽  
Economic Research ◽  
Dimensionless Form ◽  
Qinshui Basin ◽  
Well Spacing ◽  
Well Pattern ◽  
Square Well ◽  
Well Pattern Optimization ◽  
Two Parameters ◽  
Selection Of

CBM well pattern optimization is the key issue for CBM development. Usually the selection of well pattern is a problem to coordinate the cumulative productivity and recovery. For finding the optical well spacing, this article will coordinate the two parameters after they are transformed into dimensionless form. And the economic research for the optimal well spacing is adopted as a supplemented proof. Finally the CBM well pattern of the block in North Qinshui basin must be a square well pattern the 300m×300m is regarded as the optimal well spacing.

Study on Well Pattern Optimization of Tight Sandstone Gas Reservoir with the Strong Heterogeneity

2013 ◽  
Author(s):  
Ji Zhang ◽  
Tao Lu ◽  
Yuegang Li ◽  
Shuming Yu ◽  
Jingbu Li ◽  
...  
Keyword(s):  
Tight Sandstone ◽  
Gas Reservoir ◽  
Well Pattern ◽  
Well Pattern Optimization

scholarly journals Gas drainage radius evaluation and well pattern optimization of multilayer gas reservoirs

2020 ◽  
Vol 793 ◽  
pp. 012047
Author(s):  
Zhijun Liu ◽  
Zhenglin Mao ◽  
Haobo Zhang ◽  
Yongbin Zhang ◽  
Qian Liu ◽  
...  
Keyword(s):  
Gas Reservoirs ◽  
Gas Drainage ◽  
Drainage Radius ◽  
Well Pattern ◽  
Well Pattern Optimization

Optimizing Well Spacing Using Srkachef Relational Expression

2012 ◽  
Vol 616-618 ◽  
pp. 891-897
Author(s):  
Heng Song ◽  
Lun Zhao ◽  
Zi Fei Fan ◽  
Xue Lin Wu ◽  
Jian Xin Li
Keyword(s):  
Accurate Method ◽  
Development Cost ◽  
Advanced Level ◽  
Field Development ◽  
Remarkable Improvement ◽  
Well Spacing ◽  
Well Pattern ◽  
Oilfield Development ◽  
Different Thickness ◽  
Desirable Effect

With the remarkable improvement in recognition concerning the feature of the reservoir, a comprehensive adjustment is required to be made during the process of field development. Among currently prevalent methods, well pattern thickening is regarded as the most effective way to maintain or boost the oil productivity. However, to avoid the consequent high development cost of this method, optimizing a reasonable well spacing becomes a necessity to ensure a desirable effect of exploitation as well as an advanced level of economic effectiveness. In this paper, the author sets Zhanazhol Oilfield as an example and uses Srkachef relational expression to provide an accurate method, in which gives a detailed illustration about optimizing economic limit well spacing and economic optimal well spacing in different thickness reservoirs. Given its favorable adaptability, this method will become a valuable reference for the oilfield development in relation to well pattern deployment and thickening in late period.

The Research of Flood Pattern Completeness in the Thin and Poor Oil Layers of South West II Area

2012 ◽  
Vol 594-597 ◽  
pp. 2541-2544
Author(s):  
Xiao Hui Wu ◽  
Kao Ping Song ◽  
Chi Dong ◽  
Ji Cheng Zhang ◽  
Jing Fu Deng
Keyword(s):  
Oil Recovery ◽  
Water Flooding ◽  
South West ◽  
Oil Distribution ◽  
Well Pattern ◽  
Remaining Oil ◽  
Tertiary Oil Recovery ◽  
Well Pattern Optimization ◽  
Numerical Simulation Technique

As line well pattern is the main development technique in the thin and poor oil layers of Daqing Oilfield South West Ⅱ PⅠ group, the layers have been idle and the degree of reserve recovery is far less than the region level. In response to these problems, we analyzed the balanced flood performance of various layers and the remaining oil distribution through numerical simulation technique. It shows that, the main remaining oil type of intended layers is caused by voidage-injection imperfection. Considering the needs of the follow-up infill well pattern and tertiary oil recovery, we decided to keep the well network independent and integrated without disturbing the pattern configuration and main mining object of various sets of well pattern. Finally we confirmed to perforate-adding the first infill wells of intended layers to consummate the water flooding regime. Through analyzing the production target of different well pattern optimization programs relatively, it shows that the best program has regular well pattern and large drilled thickness.

New Calculation Method of Sweep Efficiency after Pattern Infilling in Low Permeability Reservoir

2014 ◽  
Vol 1010-1012 ◽  
pp. 1713-1718
Author(s):  
Fang Zhao ◽  
Rui Shen ◽  
Gang Xu
Keyword(s):  
Calculation Method ◽  
Statistical Data ◽  
Effective Means ◽  
Low Permeability ◽  
Effect Evaluation ◽  
Sweep Efficiency ◽  
Well Spacing ◽  
Well Pattern ◽  
Development Effectiveness ◽  
Result Show

Sweep efficiency is a very important parameters for development effect evaluation and dynamic analysis of oilfield. For low permeability oilfield, well pattern thickening is one of the most effective means of improving development effectiveness. In this paper, a corrected calculation method is given and well spacing density is introduced as a parameter for the formula correction. The curve of volumetric sweep efficiency and well spacing density was achieved through the formula and statistical data. After the infill adjustment, increasing multiple of sweep efficiency can be calculated. Using the actual data of Changqing oilfield to calculate, result show that the deviation is 1.1% .

Seismic stratigraphy and oil recovery potential of tide‐dominated depositional sequences in the Lower Misoa Formation (Lower Eocene), LL-652 Area, Lagunillas Field, Lake Maracaibo, Venezuela

Geophysics ◽  
1997 ◽  
Vol 62 (5) ◽  
pp. 1483-1495 ◽  
Author(s):  
William A. Ambrose ◽  
Eulise R. Ferrer
Keyword(s):  
Oil Recovery ◽  
Resource Base ◽  
Lower Eocene ◽  
Maracaibo Basin ◽  
Recovery Potential ◽  
Well Spacing ◽  
Well Pattern ◽  
Remaining Oil ◽  
North Part ◽  
Original Oil In Place

Structurally complex, heterogeneous, estuarine‐delta and tide‐dominated shelf reservoirs in the Lower Misoa Formation (Lower Eocene C Members) in the LL-652 Area of Lagunillas Field in the Maracaibo Basin, Venezuela, had produced 135 million stock‐tank barrels (MMSTB) of oil as of 1993 but have a low recovery efficiency of 22 percent. In an 18-month joint study, the Bureau of Economic Geology (BEG) and Lagoven, S. A., demonstrated that these reservoirs will contain more than 900 MMSTB of unrecovered mobile oil at the end of primary recovery operations at the current 80‐acre well spacing. Two‐dimensional seismic, core, geophysical log, and production data were integrated to improve estimates of hydrocarbon reserves and to identify potential areas for secondary‐recovery projects in Lower Eocene reservoirs in the LL-652 Area. Maps of hydrocarbon pore volume (SoPhih) and remaining oil were derived from improved petrophysical characterization and production apportioning to specific reservoir horizons by permeability feet (kh). These maps indicate that most remaining oil lies in the poorly developed and structurally complicated north part of the field and where narrow [less than 2000 ft (<610 m) wide], high‐SoPhih belts are intersected by sealing and partly sealing reverse faults. The original‐oil‐in‐place resource base of the C Members in the LL-652 area increased by 867 MMSTB (60%) to 2318.2 MMSTB, mainly in the C-3-X and C-4-X Members, by identifying additional reservoir areas and improving quantification of porosity and other petrophysical parameters. Extended development on the current 80-acre [1968-ft (600-m)] well pattern will increase reserves from 127 to 302 MMSTB. However, 116 MMSTB, in addition to the 302 MMSTB, can be produced from 102 geologically based infill wells strategically targeted to tap areas of high remaining oil saturation in narrow sandstone bodies poorly contacted at the current well spacing. Horizontal and inclined wells in steeply dipping strata can capture additional volumes of poorly contacted mobile oil.

Evaluation of the One-Well Uranium Leaching Test: Restoration

1982 ◽  
Vol 22 (01) ◽  
pp. 141-150 ◽  
Author(s):  
Muhammad I. Kabir ◽  
Larry W. Lake ◽  
Robert S. Schechter
Keyword(s):  
Acid Leaching ◽  
Leach Solution ◽  
Damkohler Number ◽  
Damköhler Number ◽  
Well Spacing ◽  
Number Of Factors ◽  
Well Pattern ◽  
Mineralized Zone ◽  
Selection Of

Abstract In-situ leach mining for uranium is an emerging technology. Currently, the selection of a well pattern designed to recover mineral values is governed primarily by arguments based on hydrological considerations. The effects of well pattern and well spacing on uranium recovery and oxidant utilization are considered in this paper. As expected, formation permeability heterogeneities and anisotropies are found to be important issues requiring careful consideration, however, it also is shown that chemical factors cannot be ignored. In particular, it is shown that the oxidant efficiency and the produced uranium solution concentrations are sensitive to the presence of other minerals competing with uranium for oxidant. If the Damkohler number for competing minerals, which measures the speed of the reaction, exceeds that for uranium, the competing mineral will have to be oxidized completely to recover a large proportion of the uranium. If the Damkohler number is smaller, it may be possible to achieve considerable selectivity for uranium by adjusting the well spacing. It also is shown that the oxidant efficiency is generally highest for well patterns that give streamlines of roughly equal length and that there is a minimum distance between injection and production wells to utilize oxidant most advantageously. Introduction In-situ solution mining is a process whereby uranium is recovered from permeable sandstone bodies by injecting and producing a leach solution through an array of wells penetrating the mineralized zone. It appears to have broad application and in many situations offers both economic and environmental advantages. The processes may be classified generally as acid or alkaline, but the general features of both are the same. The insoluble uranium in the mineralized zone is in the +4 state of oxidation. To be mobilized, the uranium must be oxidized to the +6 state and complexed either with sulfate in the case of acid leaching or carbonate in the case of alkaline leaching to form highly soluble uranyl sulfates or carbonates. The leach solutions, therefore, contain an oxidant (oxygen, hydrogen peroxide, ferric cations, sodium hyperchlorite, etc.) together with a complexing agent (anion). The choice of leach solution depends on a number of factors including selectivity and injectivity. For example, formations containing more than 1 wt% carbonates are not likely to be candidates for acid leaching because of the large acid requirement and because of permeability loss due to precipitation of calcium sulfate. It is the purpose of this paper to consider the technical factors (as opposed to economic) that govern the choice of well pattern to be used for leaching. The discussion is structured so that the conclusions apply to both alkaline and acid lixiviants and to any oxidant, although an occasional reference to a particular oxidant may appear. Considerable use is made of the computer simulator previously reported. The computational details are available in that paper. A number of factors that pertain to the selection of a well pattern are considered. It is shown that the effectiveness of the oxidant - i.e., the uranium recovered per unit of oxidant injected - is related to the well pattern, to the reaction rates, and to the permeability variations, especially if the formation is anisotropic. Furthermore, the spacing between wells is related to reactions with oxidizable minerals that compete for oxidant. These considerations can be quantified to some extent by studying linear systems. Linear Flow Systems SPEJ P. 132^

scholarly journals Analysis of hydraulic fracture behavior and well pattern optimization in anisotropic coal reservoirs

2020 ◽  
pp. 014459872096083
Author(s):  
Yulong Liu ◽  
Dazhen Tang ◽  
Hao Xu ◽  
Wei Hou ◽  
Xia Yan
Keyword(s):  
Hydraulic Fracture ◽  
Coalbed Methane ◽  
Fracture Network ◽  
Simulation Software ◽  
Natural Fracture ◽  
Hydraulic Fractures ◽  
Natural Fractures ◽  
Well Pattern ◽  
Well Pattern Optimization ◽  
The Impact

Macrolithotypes control the pore-fracture distribution heterogeneity in coal, which impacts stimulation via hydrofracturing and coalbed methane (CBM) production in the reservoir. Here, the hydraulic fracture was evaluated using the microseismic signal behavior for each macrolithotype with microfracture imaging technology, and the impact of the macrolithotype on hydraulic fracture initiation and propagation was investigated systematically. The result showed that the propagation types of hydraulic fractures are controlled by the macrolithotype. Due to the well-developed natural fracture network, the fracture in the bright coal is more likely to form the “complex fracture network”, and the “simple” case often happens in the dull coal. The hydraulic fracture differences are likely to impact the permeability pathways and the well productivity appears to vary when developing different coal macrolithtypes. Thus, considering the difference of hydraulic fracture and permeability, the CBM productivity characteristics controlled by coal petrology were simulated by numerical simulation software, and the rationality of well pattern optimization factors for each coal macrolithotype was demonstrated. The results showed the square well pattern is more suitable for dull coal and semi-dull coal with undeveloped natural fractures, while diamond and rectangular well pattern is more suitable for semi-bright coal and bright coal with more developed natural fractures and more complex fracturing fracture network; the optimum wells spacing of bright coal and semi-bright coal is 300 m and 250 m, while that of semi-dull coal and dull coal is just 200 m.

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