油藏工程课程设计(计算实例)一.油区基本资料1.油藏基本参数(以2班18号同学为例做具体实例分析)含油面积:地层压力梯度:0.1MPa/10m,地温梯度:3.7℃/100m由上表可计算得(厚度加权法):油藏有效厚度之和为:序号12345678910有效厚度m2.612.853.313.274.053.153.424.284.384.23孔隙度0.3450.35520.33780.33520.33660.33280.33580.33670.34270.3438渗透率mD202.5364.3451.4582.1605.4668.8516.9402.6348.2284.92S=4++=4+218+=5.7km415415班号序号101==35.55iihhm平均孔隙度为:平均渗透率为:2.流体物性地面条件下:地层条件下:地层泡点压力:原油体积系数:水的体积系数:3399.0iiihh08.1B030cm/g9.03wcm/g0.1MPa20Pb0.1Bw231086.442mhKhKiii018=40+=40+=40.9mPas2020序号w=0.4+=0.4+=0.45mPas42040班号3.油水相渗关系:SwkroKrw0.3200.65000.00000.3520.58610.00170.3840.52440.00590.4160.46510.01200.4480.40820.01980.4800.35380.02920.5120.30210.04020.5440.25320.05270.5600.23000.05950.5760.20720.06660.5920.18530.07410.6080.16440.08180.6240.14390.09000.6400.12510.09840.6560.10620.10720.6720.08950.11620.6880.07280.12570.7040.05810.13530.7360.03160.15570.7680.01120.17730.800.00000.2000Swi=0.32Sm=0.8Sor=0.2Sw-Kro、Sw-Krw关系曲线图00.10.20.30.40.50.60.700.20.40.60.81SwKroKrwkroKrw4.油水井操作条件:注采压差△P=3MPa;排状注水的排距与井距之比为2:1;初期采油速度为3﹪;油水井正常生产时间为300天/年;5.井眼半径:0.1m6.常用经济指标:钻井成本:1000元/米;注水单价:6元/米3;输油单价:60元/吨;生产维护费:150元/吨;作业费用:20000元/(井﹒年);地面工程建设费=0.5×钻井费用;原油的商品率:95﹪;原油价格:1200元/吨;贷款利率:5.48﹪;存款利率:1.98﹪;二.设计内容1.分析油藏的纵向非均质性,并计算储量常用的一种处理纵向非均质性的方法是看反映渗透率非均质程度的参数——变异系数(V))K(E)K(E)K(EV22()iiEKKH22iiEK=KH()22iiEK=KH()()因此地层非均质性不大。储量为:00663(1)/(1)/5.71012.0834(10.320)43.3660101.08wiiiwiNShSBShSBm带入具体数据得6.30)()()(22KEKEKEV2.根据油藏特点论证划分开发层系的可行性划分开发层系,是将特征相近的油层合在一起,用一套生产井网单独开采,根据开发层系划分的原则,油层特性相近的油层组合在同一开发层系,以保证各油层对注水方式和井网具有共同的适应性,减少开发过程中的层间矛盾,单层突进.油层性质相近包括:沉积条件,渗透率,油层分布面积,层内非均质程度等.根据油区各小层基本资料,该油藏各小层渗透率多在到间分布,属于高渗油藏,且各小层孔隙度都比较接近,变化不大,均质程度较好,因此将此10小层作为一个开发层系进行开发.3.注水方式的选择选择排状注水方式进行开发.采油速度要达到3%,而排状注水适用于高速开采油田.31020023m106004.利用排状注水开发指标计算方法,计算相应的开发指标.⑴计算初始产量,并根据油田产量要求确定油井数及水井数.初始产量为设井距为Xm,则排距为,截面积;由相渗关系数据表知,束缚水饱和度对应的为0.6500,∴化为地面产量为初期采油速度为5%,故初始年采油量为320.0SwiroK00K()rowieKSPqAL2meLXihxxhAscmhxxPSKKALPSKKqiwiroewiro/3076.37510055.352309.4065.01086.4422)()(33000dmqo/0246.301024360008.13076.37536300%50nqNQ所以油井数为,取套数n=241口.因为油井与水井数比为1:1,故水井数量n′=241口.⑵计算井距与排距设井距为X,则排距为2X,如右图:(2x+2x)·x·n=S则∴排距⑶求前缘含水饱和度根据相渗关系表中数据,计算含水率,及随的变化率.)S(f153.27902eLmx)S(fww)S(fwwX2X2XmnSx8951.762414107.546所用公式:其中所有计算结果数据见下表:1W3W1W1W3W3)S(f)S(fSf)S(f8889.9045.09.40worowrwrooroWrwWrwwKK11/K/K/KfSWKroKrwfw(Sw)fw'(Sw)0.320.6500.000000.3520.58610.00170.20867.89970.3840.52440.00590.50567.69410.4160.46510.0120.70104.83640.4480.40820.01980.81512.83320.480.35380.02920.88241.69570.5120.30210.04020.92361.05350.5440.25320.05270.94980.74110.560.230.05950.95920.53470.5760.20720.06660.96690.43810.5920.18530.07410.97320.35820.6080.16440.08180.97840.29650.6240.14390.090.98270.2450.640.12510.09840.98620.20330.6560.10620.10720.98920.16850.6720.08950.11620.99160.13910.6880.07280.12570.99370.11560.7040.05810.13530.99530.08550.7360.03160.15570.99780.06260.7680.01120.17730.99930.03480.800.210.0219~wwfS应该绘制的曲线:1、关系曲线fw—Sw关系曲线图00.20.40.60.811.200.20.40.60.81Swfwfw(SW)SwiSwf=0.3842、wwS~f关系曲线fw'—Sw关系曲线图012345678900.10.20.30.40.50.60.70.80.9Swfw’fw'(Sw)根据表中数据和及,在坐标纸中以为横坐标,以为纵坐标,分别绘出关系曲线和关系曲线,在含水率与含水饱和度曲线图中,通过束缚水饱和度点对先作切线,得到的切点所对应的含水饱和度即为水驱油前缘含水饱和度,因此求得的前缘含水饱和度(见图).⑷计算见水前开发指标①求非活塞因子B由数据知,则束缚水饱和度为残余油饱和度为384.0Swf6941.7)S(fwfwwwS~f)S(fww)S(fwwwSwwf,fwwS~fwiSwwS~fwfS384.0Swf1)S(K)S(K)S(fd)S(f)S(KBwfmSSrwrrowwfwwiro65.0)S(K,320.0Swirowi8.020.01S1S,20.080.01SormorwS最大含水饱和度积分②以一年为一个点计算见水前开发指标(以下q均为单井日产量)公式:其中,为初始产量,为油水前缘位置.oqfL04132.4)(K)(K)S(f)S(K)S(K)S(fd)S(K)S(K)S(fdrwrrow384.08.0rwrrowSSrwrrowwfm中中65859.0104132.46941.765.0B11foetwwff10fwwfeq(t)1q(t)LqB1Lf(S)Lq(t)dtAL1tf(S)L第一年:未见水.第二年:将第一年中求得的有因次化,作为第二年的初始产量.etwfwfLdttqASfL5879.743008.010246.30154.9296941.7)()(0146885.118951.1535879.7465859.0111)(1efLLBtq154.9290834.128951.76hxhxhhAiiiiii06299.08951.1535879.746941.71)(1efwfwLLSft)(1tq同理求得:故在第二年见水.无因次见水时间根据的定义,将有因次化得见水时间.设见水时刻为第二年的第X天,则86.222373008.011016.443008.010246.30)(/1016.440246.3046885.1)()(013011tdttqdmqtqtq则et01bALdt)t(qtefLL146.18486.22237154.9296941.7110.12997()7.8941wwfbftSbtbt30.024630044.10160.12997,217.6929.154153.8951xx解得6故见水时间t=300+218=518,即在第518天见水.见水时刻无因次产量为将其有因次化为③计算见水后开发指标公式:9290.265859.0111B1qbd/m9421.870246.30929.2qqq30bb)S(f1vdt)t(qtdt)t(qdt)t(qdt)t(q,dt)t(qA)S(fL)S(K)S(K)S(fd)S(Z)S(f1)t(qq),S(f)t(qq)S(Z)S(K)S(f)t(qwewt0tt2t01t0t0weweSSrwrro第二年(之后)将作为此82天的产量.对应曲线,找到5.5315对应的为0.416,由数据表中数据可计算btbq5315.5781.25832154.9297902.153)()(781.25832)218300(9421.872188.011016.443008.010246.30)()()(0'2001tewewttttdttqALsfdttqdttqdttqbb~)S(f()0.701wwefS062.410.8()()()1.85686()()()()()5.5315()4.583()()0.651.85686中中weS无因次开发时间第三年:将第二年中计算所得的年末产液量作为第三年的产量,用同样的步骤计算,及对应的有