X揮發(fā)性油藏改善開發(fā)效果數(shù)值模擬研究
發(fā)布時間：2019-01-03 20:28
【摘要】：揮發(fā)性油藏不同于普通黑油油藏,是一類特殊的油藏,有其獨特的性質。X揮發(fā)性油藏為低孔、低滲、強非均質性的異常高壓層位,A井為三分支水平井,A井的生產動態(tài)具有間歇式生產、產量較小和地層產水三個特點,日產油約3m3/d,日產氣小于1×104m3/d,且波動幅度大,平均日產水約為20m3/d左右,開發(fā)效果不理想。 本文以X揮發(fā)性油藏為研究對象,在國內外揮發(fā)性油藏研究現(xiàn)狀調研的基礎上,以實現(xiàn)單井增產和改善區(qū)塊開發(fā)效果為目標,以油氣藏數(shù)值模擬技術為研究方法,運用油藏數(shù)值模擬軟件,主要進行了注氣實驗模擬研究、揮發(fā)性油藏機理模型開發(fā)方式研究、單井增產措施和區(qū)塊開發(fā)調整對策數(shù)值模擬研究,完成的研究工作及取得的成果如下： (1)分析認為造成A井低產的原因是儲層物性差,需要對儲層進行改造,如全井段深穿透射孔、壓裂(分段壓裂)等,徹底改造油藏產能。 (2)在相態(tài)實驗擬合的基礎上,通過注氣膨脹實驗模擬研究得出注入天然氣會使流體飽和壓力升高、膨脹系數(shù)增大、飽和壓力下黏度降低、界面張力降低,且天然氣中不同組分(CH4、C2-C3、C4-C6)對流體物性影響程度不同,通過p-X相圖判定地層油與注入天然氣要達到一次接觸混相的最小壓力為60MPa。 (3)通過多次接觸實驗模擬計算了在地層溫度、不同壓力下(42MPa、46MPa)向地層油中注天然氣的向前多次接觸過程,分析了氣、液兩相界面張力、黏度、密度及不同組分含量的變化,且通過擬三元相圖判定在42MPa下注天然氣為多次接觸非混相驅,在46MPa下注天然氣為多次接觸近混相驅。 (4)采用機理模型對比研究了揮發(fā)性油藏的不同開發(fā)方式(衰竭式、連續(xù)水驅、連續(xù)氣驅、先氣驅后水驅),并對采油速度、滲透率級差等參數(shù)進行敏感性分析,認為先氣驅后水驅是該揮發(fā)性油藏最合適的開發(fā)方式。 (5)在歷史擬合的基礎上,對A井進行了補孔和壓裂優(yōu)化設計數(shù)值模擬研究,經過補孔和壓裂后,A井能夠正常生產,優(yōu)化后的設計參數(shù)為：對三個分支均進行補孔,總計增加射孔長度670m,壓裂裂縫3條(分支二1條,分支一2條),相鄰裂縫間距50m,裂縫導流能力100D·cm,裂縫半長為175m。 (6)對研究區(qū)域進行了開發(fā)調整對策數(shù)值模擬研究,在區(qū)塊南部補充一口水平井,同時部署六口直井,形成混合注采井網(wǎng),經過三個不同開發(fā)方式對比(連續(xù)水驅、連續(xù)氣驅、先氣驅后水驅),推薦方案為先氣驅后水驅,20年末原油采出程度為22.74%,開發(fā)效果得到明顯提高。
[Abstract]:The volatile reservoir is different from the ordinary black oil reservoir, it is a kind of special reservoir, and has its unique properties. X volatile reservoir is an abnormal high-pressure layer with low porosity, low permeability and strong heterogeneity, and well A is a three-branch horizontal well. The production performance of well A has three characteristics of intermittent production, small production and formation water production. Daily oil production is about 3 m3 / d, daily gas production is less than 1 脳 10 4 m 3 / d, and the fluctuation is large, the average daily water production is about 20m3/d, and the development effect is not ideal. In this paper, X volatile reservoir is taken as the research object, on the basis of domestic and international research status of volatile oil reservoir, the goal is to achieve single well production increase and improve the development effect of block, and the numerical simulation technology of oil and gas reservoir is taken as the research method. By using the software of reservoir numerical simulation, the simulation of gas injection experiment, the development mode of volatile reservoir mechanism model, the measures of increasing production of single well and the adjustment countermeasure of block development are studied. The results obtained are as follows: (1) the analysis shows that the low productivity of well A is due to the poor physical properties of the reservoir, so the reservoir needs to be reconstructed, such as deep perforation in the whole well section, fracturing (fracturing), etc. Remake reservoir productivity thoroughly. (2) on the basis of the simulation of phase state experiment, it is found that injection of natural gas can increase the saturation pressure, increase the coefficient of expansion, decrease the viscosity and decrease the interfacial tension. Different components (CH4,C2-C3,C4-C6) in natural gas have different influence on fluid physical properties. It is determined by p-X phase diagram that the minimum pressure of primary contact miscibility between formation oil and injected natural gas is 60 MPA. (3) the forward and multiple contact processes of injecting natural gas into formation oil under different pressure and formation temperature are calculated by multiple contact experiments, and the interfacial tension and viscosity of gas and liquid are analyzed. The change of density and content of different components, and through pseudo-ternary phase diagram, it is determined that natural gas injected in 42MPa is multi-contact immiscible phase flooding, while natural gas injected in 46MPa is multi-contact near-miscible flooding. (4) the different development modes of volatile reservoirs (exhaustion type, continuous water drive, continuous gas drive, first gas drive and then water drive) are compared by using the mechanism model, and the sensitivity of the parameters such as oil recovery rate and permeability difference are analyzed. It is considered that first gas flooding and then water flooding is the most suitable development method for the volatile reservoir. (5) on the basis of historical fitting, a numerical simulation study was carried out on the hole filling and fracturing optimization design of well A. After mending and fracturing, A well can be produced normally. The optimized design parameters are as follows: all the three branches are filled with holes. The total length of perforation is 670m, the fracture length is 175m, the distance between adjacent fractures is 50m and the fracture conductivity is 100D cm,. (6) A numerical simulation study of development adjustment countermeasures was carried out in the study area. A horizontal well was added to the southern part of the block, and six straight wells were deployed at the same time to form a mixed injection-production well pattern, which was compared with three different development modes (continuous water drive). Continuous gas drive, first gas drive and then water drive), the recommended scheme is first gas drive and then water drive, the degree of crude oil recovery at the end of 20 years is 22.74, and the development effect is improved obviously.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE357.7
本文編號：2399838
[Abstract]:The volatile reservoir is different from the ordinary black oil reservoir, it is a kind of special reservoir, and has its unique properties. X volatile reservoir is an abnormal high-pressure layer with low porosity, low permeability and strong heterogeneity, and well A is a three-branch horizontal well. The production performance of well A has three characteristics of intermittent production, small production and formation water production. Daily oil production is about 3 m3 / d, daily gas production is less than 1 脳 10 4 m 3 / d, and the fluctuation is large, the average daily water production is about 20m3/d, and the development effect is not ideal. In this paper, X volatile reservoir is taken as the research object, on the basis of domestic and international research status of volatile oil reservoir, the goal is to achieve single well production increase and improve the development effect of block, and the numerical simulation technology of oil and gas reservoir is taken as the research method. By using the software of reservoir numerical simulation, the simulation of gas injection experiment, the development mode of volatile reservoir mechanism model, the measures of increasing production of single well and the adjustment countermeasure of block development are studied. The results obtained are as follows: (1) the analysis shows that the low productivity of well A is due to the poor physical properties of the reservoir, so the reservoir needs to be reconstructed, such as deep perforation in the whole well section, fracturing (fracturing), etc. Remake reservoir productivity thoroughly. (2) on the basis of the simulation of phase state experiment, it is found that injection of natural gas can increase the saturation pressure, increase the coefficient of expansion, decrease the viscosity and decrease the interfacial tension. Different components (CH4,C2-C3,C4-C6) in natural gas have different influence on fluid physical properties. It is determined by p-X phase diagram that the minimum pressure of primary contact miscibility between formation oil and injected natural gas is 60 MPA. (3) the forward and multiple contact processes of injecting natural gas into formation oil under different pressure and formation temperature are calculated by multiple contact experiments, and the interfacial tension and viscosity of gas and liquid are analyzed. The change of density and content of different components, and through pseudo-ternary phase diagram, it is determined that natural gas injected in 42MPa is multi-contact immiscible phase flooding, while natural gas injected in 46MPa is multi-contact near-miscible flooding. (4) the different development modes of volatile reservoirs (exhaustion type, continuous water drive, continuous gas drive, first gas drive and then water drive) are compared by using the mechanism model, and the sensitivity of the parameters such as oil recovery rate and permeability difference are analyzed. It is considered that first gas flooding and then water flooding is the most suitable development method for the volatile reservoir. (5) on the basis of historical fitting, a numerical simulation study was carried out on the hole filling and fracturing optimization design of well A. After mending and fracturing, A well can be produced normally. The optimized design parameters are as follows: all the three branches are filled with holes. The total length of perforation is 670m, the fracture length is 175m, the distance between adjacent fractures is 50m and the fracture conductivity is 100D cm,. (6) A numerical simulation study of development adjustment countermeasures was carried out in the study area. A horizontal well was added to the southern part of the block, and six straight wells were deployed at the same time to form a mixed injection-production well pattern, which was compared with three different development modes (continuous water drive). Continuous gas drive, first gas drive and then water drive), the recommended scheme is first gas drive and then water drive, the degree of crude oil recovery at the end of 20 years is 22.74, and the development effect is improved obviously.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE357.7
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，本文編號：2399838
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