巴48断块稠油油藏水驱调整方案
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摘要
巴48断块稠油油藏Ⅲ油组油层分布受构造和岩性双重因素控制,为岩性-构造油藏。油层主要发育于Ⅲ油组,细分为Ⅲ1、Ⅲ2两个次级油组。其中Ⅲ1油组平均孔隙度21.5%,有效渗透率34.81 10~(-3)μm~2,总体属于中孔低渗透储层。Ⅲ2油组平均孔隙度12.7%,有效渗透率物性变化大,总体属中低孔中渗透储层。平均地层原油密度为0.8659g/cm~3,地下原油粘度在56mPa s～110mPa s之间,具有原油粘度高,密度大和在地层中流动阻力大等特点,所以开采时驱替效率低,采用常规开采方式开发效率低。但是在现有工作制度的水驱开采过程中,怎样提高水驱的波及范围和提高常规开采方式的采收率,本文做了进一步研究。巴48断块稠油油藏Ⅲ油组地质储量是202 10~4t,标定采收率为19%,水驱剩余油储量较大。本文根据巴48断块稠油油藏的地质特征和在现有工作制度下的水驱数值模拟结果预测,对该断块剩余油在平面和纵向上的分布规律进行研究,结果表明,Ⅲ2油组分布面积较大,油层主要集中分布于断块北部,Ⅲ1油组油层主要分布于断块南部。部分地质小层的采出程度小于10%,其余地质小层的采出程度在20%左右,水驱开发效果不佳。总结影响现有工作制度水驱剩余油分布的因数,根据巴48断块稠油油藏的地质特征,在管柱及工艺条件允许的条件下提出了分段注水和油井转水井的改善巴48断块稠油油藏的水驱开发效果的调整方案。巴48断块油藏Ⅲ油组部署13口采油井、6口水井,根据Ⅲ油组目前油井日产状况分析,13口油井初始日配注水量129.4 m3,平均单井日配注水量21.57m3,在总量不变的情况下,实施分段注水,其中Ⅲ11、Ⅲ12为第一注水段,Ⅲ13、Ⅲ14、Ⅲ15、Ⅲ21、Ⅲ22和Ⅲ23为第二注水段。采取了四种分段注水方案,以巴48-3和巴48-38分段注水效果较佳,与现有工作制度比较,提高采出程度2.2个百分点,增加油量45298t。从注采关系上看,部分油水注采井距较大,需要进一步改善。实施油井巴48-16转为水井,用内插法确定水井巴48-16注水量,并对各油井重新配产。与现有工作制度比较,提高采出程度1.3个百分点,增加油量26765t。实现了巴48断块稠油油藏高效水驱开发,对该区块下步的高效开发具有重要的指导作用。
Viscous crude oil reservoir block Ba 48 is lithology-structural and so the reservoir zonation is controlled by dual factors,structure and lithology. The reservoir is mainly developed in groupⅢ, subdivided intoⅢ1,Ⅲ2.TheⅢ1 belongs to the mesoporosity-low permeability reservoir in the hole with an average porosity of 21.5%,and effective permeability of 34.81×10~(-3)μm~2.TheⅢ2 has an average porosity of 12.7% and variation in the effective permeability properties, it is overall meso-low-porosity and mesopermeability.The formation crude is of high viscosity, density, and flow resistance, it has an average density of 0.8659g/cm3, and a viscosity of 56mPa?s～110mPa?s,therefore, the displacement efficiency in the exploitation is low, the use of conventional mining methods has a low efficiency.This paper has done further research in how to improve the swept scope of water flooding and the conventional mining method recovery in the existing work system.The geological reserves of viscous crude oil reservoir block Ba 48 in groupⅢare 202×104t,rated recovery is 19%,large remaining oil reserves of water flooding.This paper has studied on the distribution of the remaining oil in the plane and longitudinal of this block on the basis of the geologic feature of viscous crude oil reservoir block Ba 48. The results show that the distribution area ofⅢ2 is larger,and the reservoir is mainly distributed in the northern block,theⅢ1 reservoir is mainly distributed in the southern block.Part of the geological layers has a recovery of less than 10%, and the others about 20%, ineffective water flooding.Based on the geologic feature of reservoir block Ba 48, and summarized the influence of waterflood residual oil distribution factor under the existing working system, proposed sub-injection and oil wells turn to improve the effect of water flooding for viscous crude oil reservoir block Ba 48 under the conditions of column and technology allowed.Viscous crude oil reservoir block Ba 48 in groupⅢhas 13 production wells and 6 injection wells,based on the analysis of the current daily output of oil wells, the initial daily injection allocation of 13 oil wells is 129.4m3,the average daily injection allocation of a single well is 21.57m3, implemented sub-injection in the case of constant total, oneⅢ11,Ⅲ12 for the first injection section,andⅢ_13,Ⅲ_14,Ⅲ_15,Ⅲ_21,Ⅲ_22 andⅢ_23 for the second injection section. Four sub-injection programs have been adopted,the sub-injection effects of Ba 48-3 and Ba 48-38 are better,increased the recovery level at 2.2 percentage points comparing with the existing working system,increased oil 45298t.Some of the injector producer distance is larger from the point of injection/production relationship and need further improvements.Implementation of the oil wells turn of Ba 48-16,used interpolation to determine the injection flow rate of Ba 48-16,re-prorated production for each producer.Comparing with the existing working system,increased the recovery level of 1.3 percentage points,increased oil 26765t.Achieved efficient water flooding for viscous crude oil reservoir block Ba 48, had an important role in guiding the efficient development next step in this block.
Viscous crude oil reservoir block Ba 48 is lithology-structural and so the reservoir zonation is controlled by dual factors,structure and lithology. The reservoir is mainly developed in groupⅢ, subdivided intoⅢ1,Ⅲ2.TheⅢ1 belongs to the mesoporosity-low permeability reservoir in the hole with an average porosity of 21.5%,and effective permeability of 34.81×10~(-3)μm~2.TheⅢ2 has an average porosity of 12.7% and variation in the effective permeability properties, it is overall meso-low-porosity and mesopermeability.The formation crude is of high viscosity, density, and flow resistance, it has an average density of 0.8659g/cm3, and a viscosity of 56mPa?s～110mPa?s,therefore, the displacement efficiency in the exploitation is low, the use of conventional mining methods has a low efficiency.This paper has done further research in how to improve the swept scope of water flooding and the conventional mining method recovery in the existing work system.The geological reserves of viscous crude oil reservoir block Ba 48 in groupⅢare 202×104t,rated recovery is 19%,large remaining oil reserves of water flooding.This paper has studied on the distribution of the remaining oil in the plane and longitudinal of this block on the basis of the geologic feature of viscous crude oil reservoir block Ba 48. The results show that the distribution area ofⅢ2 is larger,and the reservoir is mainly distributed in the northern block,theⅢ1 reservoir is mainly distributed in the southern block.Part of the geological layers has a recovery of less than 10%, and the others about 20%, ineffective water flooding.Based on the geologic feature of reservoir block Ba 48, and summarized the influence of waterflood residual oil distribution factor under the existing working system, proposed sub-injection and oil wells turn to improve the effect of water flooding for viscous crude oil reservoir block Ba 48 under the conditions of column and technology allowed.Viscous crude oil reservoir block Ba 48 in groupⅢhas 13 production wells and 6 injection wells,based on the analysis of the current daily output of oil wells, the initial daily injection allocation of 13 oil wells is 129.4m3,the average daily injection allocation of a single well is 21.57m3, implemented sub-injection in the case of constant total, oneⅢ11,Ⅲ12 for the first injection section,andⅢ_13,Ⅲ_14,Ⅲ_15,Ⅲ_21,Ⅲ_22 andⅢ_23 for the second injection section. Four sub-injection programs have been adopted,the sub-injection effects of Ba 48-3 and Ba 48-38 are better,increased the recovery level at 2.2 percentage points comparing with the existing working system,increased oil 45298t.Some of the injector producer distance is larger from the point of injection/production relationship and need further improvements.Implementation of the oil wells turn of Ba 48-16,used interpolation to determine the injection flow rate of Ba 48-16,re-prorated production for each producer.Comparing with the existing working system,increased the recovery level of 1.3 percentage points,increased oil 26765t.Achieved efficient water flooding for viscous crude oil reservoir block Ba 48, had an important role in guiding the efficient development next step in this block.
引文
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[5]石晓渠,马道祥.注水井合理配注水量计算方法研究[J].西部探矿工程,2008,9:94-96
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[17]梁柱,姜岭,姚军.巨厚块状特稠油油藏水淹特征及堵水效果评价[J].特种油气藏,2007,14(3):69-71
[18]骆瑛.复杂断块高含水油藏加密井网提高采收率研究[J].小型油气藏,2007,12(3):47-48
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[22]曾宪红.稠油注水油田中后期改善开发效果技术研究[D].成都:西南石油学院学报,2006,28(5):61-64
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[24]曲同慈,李爽.利用水平井提高稠油油藏剩余油采收率技术[J].石油勘探与开发,2009,36(6):743-748
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[30]鞠斌山,樊太亮,王晓冬等.原油粘度变化对水驱油开发动态影响的数学模拟方法[J].地球科学—中国地质大学学报,2006,31(3):378-383
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