异常高低压井分析

单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,单击此处编辑母版标题样式,喇嘛甸油田聚合物驱北北块一区异常高低压井分析,异常高低压现象,1,异常现象的判断与分析,2,针对高低压异常现象采取的措施,3,结论及认识,4,随着油田进一步的开发，注水井射孔层段的污染日益严重，孔隙孔道堵塞，使渗透率降低。地层吸水能力下降，同时还可能使设备腐蚀加剧，导致水井难以注水，井内压力不断升高，甚至到达压力破裂，对地层造成伤害。,而众所周知，油井开采一段时间之后压力会有所下降，继续抽油还会产生负压（尽管很小）。而当封堵一口与油井相连通的水井时，该油井依旧正常运作，也容易导致油井内压力降低。而压力系统不均衡也是导致套损的直接因素，更是动态分析中调整注采结构的主要依据之一。注入大于采出，注采失调，影响着油田稳产及整体注聚开发效果。,北北一区出现异常高低压现象,聚合物驱北北块一区油、水井统计表,目前地层压力和原始地层压力的差值，当差值在,-1,与,0.5,之间时为合理井，差值小于,-1,为低压，差值大于,0.5,为高压。,油井的合理井井数为,11,口，占对比井数,20.37%,，而高压井井数为,29,口，占对比井数,50.70%,，低压井井数为,14,口，占对比井数,25.93%,；,水井合理井井数为,3,口，占对比井数,15.79 %,，而高压井井数为,16,口，占对比井数,84.21 %,，低压井井数为,0,口。说明平面压力分布不均衡，压力异常井数占较大比例，平面压力分布不平衡仍需进一步调整，采取措施，搞好注采平衡。,油、水井压力异常现象的判断与分析,结蜡会造成油流通道减小,油井负荷增大,也会导致井口回压升高。随着聚合物注入时间的延长，聚合物在井底附近不断累积吸附和滞留，形成聚合物滤积，使注聚井注入压力升高。油井压力升高后，导致吸水能力下降，油井注入能力有了很大幅度的下降，有时甚至完全注不进去，造成部分井区地层压力下降。,油层连通条件差引起注水井不吸水或吸水差；注大干采形成异常高压层，造成不吸水或吸水变差；油层受到污染伤害引起注水井层吸水变差；多层配注条件下，高渗透层干扰比较严重，造成中低渗透层吸水能力变差都是造成注水井欠注的因素。,表皮系数,渗透率,流动系数,产液量低,水井欠注,结蜡等,压力,其大小显示污染程度,低渗透层吸水能力差,不吸水或吸水变差,针对高低压异常现象采取的措施,压裂,可提高油层的渗透能力，以增加注水量,(,注水井,),或产油量,(,油井,),堵水,按照,“,降水增油,”,的整体思路，改善产液剖面，降低生产压差,其他,水井有无措施及各参数变化,利用水力作用，使油层形成裂缝的一种方法，又称油层水力压裂。油层压裂工艺过程是用压裂车，把高压大排量具有一定粘度的液体挤入油层，当把油层压出许多裂缝后，加入支撑剂,(,如石英砂等,),充填进裂缝，提高油层的渗透能力，以增加注水量,(,注水井,),或产油量,(,油井,),。,流动系数,渗透率,产液量,表皮系数,5,0%,压裂前后,渗透率,产液量,表皮系数,流动系数,L7-PS1323,压裂前后对比图,井号,测试日期,稳定产液量,(t/d),关井最高压力,(MPa),油层中部流压,(MPa),仪器下入深度,(m),FU071323,2009-05-04,14,10.351,0.871,1061,FU071323,2009-09-02,41,9.613,6.470,1000,2009,年,9,月双对数,2009,年,5,月双对数,试井资料分析,从测井资料也可对,L7-PS1323,进行说明，压裂成功后，采用产液剖面测井对该井进行压裂效果评价。,井号,测试日期,稳定产液量,(t/d),含水,(%),产油,(t/d),FU071323,压裂前,21.5,96.6,0.7,FU071323,压裂后,48.5,97,2.8,差值,27,0.4,2.1,测井资料分析,针对高低压异常现象采取的措施,压裂,可提高油层的渗透能力，以增加注水量,(,注水井,),或产油量,(,油井,),堵水,按照,“,降水增油,”,的整体思路，改善产液剖面，降低生产压差,其他,水井有无措施及各参数变化,油井堵水的难度要高于水井调剖，油藏状况，油层连通情况，对应井数的多少，单层或多层，纵向平面渗透率差异，剩余油情况以及油井的产能都对结果有影响。且油井越深、温度越高，堵水难度越大。堵水层位的选择也非常重要，要结合产出剖面、注入剖面、剩余油综合分析，找准出水层位，在选定合适的方法堵水。,L9-PS1233,堵水前后对比图,含水,产液,产油,堵水前后,50,%,产液,产油,含水,25,%,L9-PS1233,为一口偏心油井，,2009,年,8,月,13,日采取堵水措施，前后测试数据对比如表,3,。,井号,测试日期,稳定产液量,(t/d),含水,(%),产油,(t/d),仪器下入深度,(m),FU091233,2009-05-26,64.8,94.7,2.8,0,FU091233,2009-09-22,56.2,92.9,3.4,1125,其他,09,年前,09,年后,差值,井号,渗透率,K,表皮系数,流动系数,kh/,渗透率,K,表皮系数,流动系数,kh/,渗透率,K,表皮系数,流动系数,kh/,L4-P142,0.013,-3.312,0.253,0.013,-3.344,0.261,0,-0.032,0.008,L5-P132,0.008,-3.392,0.175,0.011,-1.622,0.242,0.003,1.77,0.067,L5-P142,0.015,-3.167,0.236,0.013,-4.201,0.199,-0.002,-1.034,-0.037,L5-P173,0.012,-1.562,0.237,0.031,-1.382,0.588,0.019,0.18,0.351,L6-P143,0.068,3.388,1.235,0.026,-2.457,0.481,-0.042,-5.845,-0.754,L6-P173,0.008,-4.527,0.192,0.006,-5.285,0.126,-0.002,-0.758,-0.066,L7-P173,0.014,-0.520,0.287,0.015,-2.309,0.325,0.001,-1.789,0.038,L8-P123,0.016,0.125,0.302,0.012,2.539,0.232,-0.004,2.414,-0.07,L8-P152,0.014,-0.789,0.391,0.013,-1.749,0.370,-0.001,-0.96,-0.021,L9-113,0.005,0.708,0.325,0.005,-0.772,0.307,0,-1.48,-0.018,L9-122,0.004,-4.159,0.159,0.005,-3.628,0.205,0.001,0.531,0.046,L9-P123,0.002,-1.099,0.049,0.005,-2.991,0.128,0.003,-1.891,0.079,L9-P163,0.019,5.218,0.324,0.008,-2.731,0.142,-0.011,-7.949,-0.182,L9-P172,0.009,-1.558,0.253,0.020,-1.601,0.547,0.011,-0.043,0.294,L9-P173,0.051,-0.831,0.880,0.030,-2.461,0.518,-0.021,-1.63,-0.362,试井中，若判断一口井是否压裂，不紧紧只看产液量或注入量是否增加，我们还要分析压裂前后各地层参数的变化。首先，从统计的资料的延续性来看，其次，表,5,针对各井,09,年前后测试数据的有效渗透率、表皮系数和流动系数进行进一步分析，各井的变化不明显，甚至未有变化。例如,L9-P163,在,09,年之前测试的表皮系数,S0,，,09,年之后的测试,S0,，有较大变化并不能说明该井采取了何种措施，综合其他参数，该井有效渗透率下降了,0.011,，流动系数下降,0.182,。,有效缩小,层间压力,保护,油层套管,调整,压力系统,影响油田,开发效果,结 论,压 力,谢,谢,2010,年,11,月,请各位领导批评指正,