Study on Rational Well Spacing Optimization of Low Permeability Gas Reservoir

Jian-guo, Zhang; Yong, Wu; Ai, Fang

doi:10.4236/ampc.2012.24b045

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…At the same water cut, the recovery degree is higher than other injectionproduction systems. Therefore, the injection-production system of tertiary infilling adjustment in East of North 3 Block should select five spots pattern [2][3][4][5] . The test well data statistics show that the floodout proportion of surface reservoir gradually decreases with the increase of the distance between inspection well and water injection well.…”

Section: Injection-production System Screeningmentioning

confidence: 99%

“…On the other hand, the development study on the surface reservoirs of other blocks in the recent years also indicates that too small injection-production well spacing can cause unfavourable rapid water cut increase. Considering the factors of the above two aspects, the reasonable injection-production well spacing for thin and ISM3E 2015) poor oil layer and surface layer effective development should be 200-250 m [2][3][4][5] .…”

Section: Injection-production System Screeningmentioning

confidence: 99%

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Study on Tertiary Infilling Adjustment Optimized Well Spacing at Super High Water Cut Stage

Li¹

2015

Proceedings of the 2015 International Symposium on Material, Energy and Environment Engineering

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Abstract. In view of the features of the remaining oil after a period of production since secondary infilling adjustment of water flooding development oil field, that is, low quality, uneven planar distribution and high vertical dispersal, study on tertiary infilling adjustment optimized well spacing has been carried out in the East of North 3 Block of North Sartu Development Area. The study has solved the problems of reasonable well spacing density, injector-producer distance, injection-production system, how to locate wells near old injector array, and how to adjust and integrate with the original well pattern, with the tertiary recovery well pattern and with the injection-production system. The overall strategy and optimized well spacing method for tertiary infilling adjustment have been brought forward consisting of reasonable well location region division →balanced well spacing →well by well scanning →local adjustment →step by step implementation. The study has a wide guidance for the tertiary infilling adjustment of other blocks to find practical, feasible and effective approaches. East of North 3 Block Development OverviewEast of North 3 Block in North Sartu Development Area is located in the north pure oil area of Sartu Oilfield in Daqing placanticline with an oil bearing area of 20.2km2. The block was brought into development in 1965 as major reservoirs in Sartu and Putaohua oil-field [1] . Since then two times of infilling adjustment had been conducted aiming at PⅡ, Gao Middle, low permeability layers and Sartu thin and poor reservoirs. 250×300m inverted nine spots area injection pattern is adopted without exception. After secondary infilling, the well spacing density reached 30.25 wells/ km 2 . According to the refined geologic anatomy result, the remaining adjustable sandstone thickness after secondary infilling adjustment in East of North 3 Block is predicted as 12.44m and the effective thickness is 1.88 m [1] . Tertiary infilling adjustment has certainly material base, but uneven the remaining oil planar distribution and vertical high resolution have determined to the hardness of production potential development. Therefore, the approach should be started from technical and economical indexes to optimize well spacing with a possible better adjustment effect. Study on Tertiary Infilling Adjustment Optimized Well Spacing in East of Injection-Production System ScreeningNumerical simulation is applied to compare the development effects of five-spot pattern, four-spot pattern, and inverted nine spots injection-production systems in the thin and poor oil layers and surface layers in East of North 3 Block. The result shows that the average control degree of water flooding of five-spot area well pattern is 8-10% high than other well patterns. At the same water cut, the recovery degree is higher than other injectionproduction systems. Therefore, the injection-production system of tertiary infilling adjustment in East of North 3 Block should select five spots pattern [2][3][4][5] . The test well data statist...

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Section: Injection-production System Screeningmentioning

confidence: 99%

Section: Injection-production System Screeningmentioning

confidence: 99%

Study on Tertiary Infilling Adjustment Optimized Well Spacing at Super High Water Cut Stage

Li¹

2015

Proceedings of the 2015 International Symposium on Material, Energy and Environment Engineering

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“…Many experts and scholars have their own opinions on the calculation method of well spacing. Li Shuang [2], Wang Xiuzhi [3] and others did not consider the influence of starting pressure gradient, and adopted economic limit control reserve method, single well area method and numerical simulation method to discuss the reasonable well spacing of low permeability gas reservoir. Although Guoqi [4] considered the influence of starting pressure gradient, deduced the formula for calculating reasonable well spacing of low permeability gas reservoir, but the calculation parameters are too many and the calculation is complicated.…”

Section: Introductionmentioning

confidence: 99%

The Researches on Reasonable Well Spacing of Gas Wells in Deep and low Permeability Gas Reservoirs

Bei

Li³

2018

E3S Web Conf.

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Abstract. This Gs64 gas reservoir is a condensate gas reservoir which is relatively integrated with low porosity and low permeability found in Dagang Oilfield in recent years. The condensate content is as high as 610g/m3. At present, there are few reports about the well spacing of similar gas reservoirs at home and abroad. Therefore, determining the reasonable well spacing of the gas reservoir is important for ensuring the optimal development effect and economic benefit of the gas field development. This paper discusses the reasonable well spacing of the deep and low permeability gas reservoir from the aspects of percolation mechanics, gas reservoir engineering and numerical simulation. considering there exist the start-up pressure gradient in percolation process of low permeability gas reservoir, this paper combined with productivity equation under starting pressure gradient, established the formula of gas well spacing with the formation pressure and start-up pressure gradient. The calculation formula of starting pressure gradient and well spacing of gas wells. Adopting various methods to calculate values of gas reservoir spacing are close to well testing' radius, so the calculation method is reliable, which is very important for the determination of reasonable well spacing in low permeability gas reservoirs.

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Intelligent Well Drainage and Interference Density Analysis Tool for Optimizing Infill Drilling

Al-Sane

Al-Bahar

Bora

et al. 2021

Day 1 Mon, November 15, 2021

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During the progressive development of mature fields, it is imperative to drill many infill wells to accelerate production and access bypassed oil. Optimizing the infill well spacing is always the concern to reduce interference with existing wells and improve recovery. In the present study, using intelligent data mining techniques, a new analysis and visualization tool has been developed and implemented to estimate and map drainage radius by well to assess the efficiency of the current development pattern and properly plan future wells. The tool deployed several performance-based techniques to estimate the contacted stock-tank oil initially in place (STOIIP) by each existing well, and outcomes can be compared between techniques for validation. The contacted STOIIP is then converted into an effective drainage radius by well using reservoir properties from the geo-cellular model. The evaluated reservoir is subdivided vertically into pay zones drained by the wells based on geological barriers/baffles to flow and connectivity across the zones. The tool estimates drainage radii of the wells produced from the reservoir using five different methods. The resultant Proved Developed Producing (PDP) reserves polygon maps are generated for the connected zones. The drainage radii of wells with behind-casing opportunities are estimated based on correlation and adjacent wells methods, and Proved Developed Non-Producing (PDNP) reserves polygon maps were generated. Well interference density is estimated based on overlapping drainage radii polygons with adjacent well locations, which has then been validated with production and pressure data from the wells. This paper describes the methodology by which the well drainage radii and well interference density can be estimated and implemented on a selected reservoir. This workflow can be successfully used to identify drained and undrained areas around the wellbore and opportunities for additional infill wells in the various pay zones of the reservoir. This exercise observed consistency in the drainage radii cumulative distribution from decline curve analysis methods and the No-Further-Activities (NFA) simulation case.

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Study on Rational Well Spacing Optimization of Low Permeability Gas Reservoir

Cited by 3 publications

References 4 publications

Study on Tertiary Infilling Adjustment Optimized Well Spacing at Super High Water Cut Stage

Study on Tertiary Infilling Adjustment Optimized Well Spacing at Super High Water Cut Stage

The Researches on Reasonable Well Spacing of Gas Wells in Deep and low Permeability Gas Reservoirs

Intelligent Well Drainage and Interference Density Analysis Tool for Optimizing Infill Drilling

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