WO2018113149A1 - 一种获得动静态弹性参数转换关系的方法 - Google Patents
一种获得动静态弹性参数转换关系的方法 Download PDFInfo
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Definitions
- the invention relates to a method for obtaining a dynamic-static elastic parameter conversion relationship, and belongs to the technical field of petroleum exploration and logging.
- the elastic parameter is a parameter used to describe the relationship between the stress applied to the rock and the strain generated, such as Young's modulus, Poisson's ratio, and so on.
- the static elastic parameter is instructive for the fracturing transformation of the oil and gas layer, but since it can only be obtained by laboratory measurement, it cannot be continuously applied in the well. Therefore, firstly, the log data is used to obtain the dynamic elastic parameters of continuous depth.
- the dynamic elastic parameters are converted into static elastic parameters by using the conversion rules of dynamic elastic parameters and static elastic parameters obtained based on experimental measurements. Finally, the full-section rock mechanics in the underground is used. Applied during the parameter evaluation process.
- the existing conversion technology of dynamic and static elastic parameters generally involves placing a series of plunger samples obtained from drilling cores in the laboratory, measuring the dynamic and static elastic parameters under approximate formation conditions, and then establishing dynamic and static elasticity.
- the linear conversion relationship of the parameters The prior art has obvious drawbacks because it does not consider the influence of the continuous variation of formation stress and lithology that may exist in the same geological horizon on the dynamic and static elastic parameter conversion law. Therefore, relying on the prior art is difficult to accurately and continuously evaluate the rock mechanics parameters of the formation with strong heterogeneous changes, restricting the accurate evaluation of the reservoir completion quality, affecting the optimization of the fracture test oil scheme and the realization of the cost reduction and efficiency improvement goals.
- the present invention provides a method for obtaining a dynamic-static elastic parameter conversion relationship, which fully considers the influence of formation stress and clay content change on dynamic and static elastic parameter conversion laws, and improves rock mechanical parameters measurement.
- Well evaluation accuracy is of great significance.
- the present invention provides a method for obtaining a dynamic-static elastic parameter conversion relationship, the method comprising the following steps:
- Step S1 acquiring horizontal cores at different depths of the destination layer
- Step S2 measuring dynamic elastic parameters of the horizontal core under different pressures
- Step S3 measuring static static parameters of the horizontal core under different pressures
- Step S4 the clay content of the horizontal core
- step S5 a relationship between the ratio of the dynamic and static elastic parameters and the formation pressure and the clay content is established; the conversion of the dynamic and static elastic parameters is completed.
- the technical solution provided by the invention measures the dynamic and static elastic parameters of the core at different depths of the reservoir under different formation pressures and the clay content, and based on the measured results, the ratio of the dynamic and static elastic parameters and the formation pressure and The relationship between the clay content and the conversion law of the dynamic and static elastic parameters can be obtained.
- the technical solution provided by the present invention is more accurate because it fully considers the effects of multiple influencing factors such as formation pressure and lithological changes.
- step S1 the obtaining the horizontal core at different depths in the destination layer comprises the following steps:
- Step S101 drilling m cores in the horizontal direction at the same depth D1 of the formation, which are respectively recorded as D 11 , D 12 , D 13 , ..., D 1m ;
- Step S102 m cores drilled at the depth D1 of the formation, each piece is divided into two small pieces, and respectively recorded as D 11A , D 11B , D 12A , D 12B , D 13A , D 13B , ..., D 1 mA , D 1mB ;
- Step S103 according to the operations of step S101 and step S102, drilling m cores at the depth D2 of the formation, and dividing each core of the m cores at the D2 into two small pieces, respectively Is D 21A , D 21B , D 22A , D 22B , D 23A , D 23B , ..., D 2mA , D 2mB ;
- step S3 measuring the static elastic parameters of the horizontal core under different pressures comprises the following steps:
- Step S501 calculating the ratio of the dynamic and static elastic parameters of the core samples at the depth D1 at the m pressure values in the P1-Pm, respectively, as E d11 /E s11 , E d12 /E s12 , E d13 /E s13 ,...,E d1m /E s1m , the plot of the ratio of the dynamic and static elastic parameters to the pressure when the formation depth is D1, that is, the ratio of the dynamic and static elastic parameters E d11 /E s11 , E d12 /E s12 , E d13 /E s13 ,...,E d1m /E s1m and their corresponding pressure values P1,P2,P3,...,Pm, the relationship between the two can be obtained by the graph;
- Step S4 measuring the clay content of the horizontal core:
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Abstract
Description
| 样号 | 粘土总量 |
| D1 | 3.5 |
| D2 | 2 |
| D3 | 19.8 |
| D4 | 20.8 |
| D5 | 16.7 |
| D6 | 12.5 |
| D7 | 11.8 |
| D8 | 14.2 |
Claims (20)
- 一种获得动静态弹性参数转换关系的方法,该方法包括以下步骤:步骤S1,获取目的地层中不同深度的水平岩芯;步骤S2,在不同的压力下,测量所述水平岩芯的动态弹性参数;步骤S3,在不同的压力下,测量所述水平岩芯的静态弹性参数;步骤S4,测量所述水平岩芯的粘土含量;步骤S5,建立动静态弹性参数的比值与地层压力及粘土含量的函数关系式;完成动静态弹性参数的转换。
- 根据权利要求1所述的方法,其中,在步骤S1中,所述获取目的地层中不同深度的水平岩芯包括以下步骤:步骤S101,在同一地层深度D1处沿水平方向钻取m块岩芯,分别记为D11,D12,D13,…,D1m;步骤S102,将地层深度D1处钻取的m块岩芯,每一块切分为两小块,并分别记为D11A,D11B,D12A,D12B,D13A,D13B,…,D1mA,D1mB;步骤S103,按照步骤S101和步骤S102的操作,钻取地层深度Dn处的m块岩芯,并将每一块岩芯切分为两小块,分别记为Dn1A,Dn1B,Dn2A,Dn2B,Dn3A,Dn3B,…,DnmA,DnmB。
- 根据权利要求2所述的方法,其中,在步骤S101中,岩芯的长度至少为8cm,直径为2.5-5cm。
- 根据权利要求2所述的方法,其中,在步骤S102中,将每一块岩芯切分为两小块时,两小块中的每一块岩芯的长度至少为4cm,直径为2.5-5cm。
- 根据权利要求2-4任一项所述的方法,其中,在步骤S2中,在不同的压力下,测量所述水平岩芯的动态弹性参数包括以下步骤:步骤S201,基于目的地层的压力,从小到大依次设置m个压力值,分别记为P1,P2,P3,…,Pm;其中,压力区间[P1,Pm]包含了整个目的地层的压力;步骤S202,在压力为P1下,对获得的水平岩芯D11A,D21A,D31A,…,Dn1A进行测量,计算它们的动态弹性参数,分别记为Ed11,Ed21,Ed31,…,Edn1;按照上述操作,在压力为Pm下,对获得的水平岩芯D1mA,D2mA,D3mA,…,DnmA进行测量,并计算它们的动态弹性参数,分别记为Ed1m,Ed2m,Ed3m,…,Ednm。
- 根据权利要求5所述的方法,其中,在步骤S202中,所述测量的项目包括密度、纵波速度和横波速度。
- 根据权利要求2-4和6任一项所述的方法,其中,在步骤S3中,在不同的压力下,测量所述水平岩芯的静态弹性参数包括以下步骤:步骤S301,基于目的地层的压力,从小到大依次设置m个压力值,分别记为P1,P2,P3,…,Pm;其中,压力区间[P1,Pm]包含了整个目的地层的压力;步骤S302,在压力为P1下,对获得的水平岩芯D11B,D21B,D31B,…,Dn1B进行测量,计算它们的静态弹性参数,分别记为Es11,Es21,Es31,…,Esn1;按照上述操作,在压力为Pm下,对获得的水平岩芯D1mB,D2mB,D3mB,…,DnmB进行测量,并计算它们的静态弹性参数,分别记为Es1m,Es2m,Es3m,…,Esnm。
- 根据权利要求5所述的方法,其中,在步骤S3中,在不同的压力下,测量所述水平岩芯的静态弹性参数包括以下步骤:步骤S301,基于目的地层的压力,从小到大依次设置m个压力值,分别记为P1,P2,P3,…,Pm;其中,压力区间[P1,Pm]包含了整个目的地层的压力;步骤S302,在压力为P1下,对获得的水平岩芯D11B,D21B,D31B,…,Dn1B进行测量,计算它们的静态弹性参数,分别记为Es11,Es21,Es31,…,Esn1;按照上述操作,在压力为Pm下,对获得的水平岩芯D1mB,D2mB,D3mB,…,DnmB进行测量,并计算它们的静态弹性参数,分别记为Es1m,Es2m,Es3m,…,Esnm。
- 根据权利要求2-4、6和8任一项所述的方法,其中,在步骤S302中,所述测量的项目包括应力和应变。
- 根据权利要求5所述的方法,其中,在步骤S302中,所述测量的项目包括应力和应变。
- 根据权利要求7所述的方法,其中,在步骤S302中,所述测量的项目包括应力和应变。
- 根据权利要求2-4、6、8、10和11任一项所述的方法,其中,在步骤S4中,测量所述水平岩芯的粘土含量包括以下步骤:步骤S401,对测量过静态弹性参数的水平岩芯D11B,D12B,D13B,…,D1mB进行X衍射测量,获得地层深度D1处的粘土含量Vcl1;步骤S402,按照步骤S401的操作,对测量过静态弹性参数的水平岩芯Dn1B,Dn2B,Dn3B,…,DnmB进行X衍射测量,获得地层深度Dn处的粘土含量Vcln。
- 根据权利要求5所述的方法,其中,在步骤S4中,测量所述水平岩芯的粘土含量包括以下步骤:步骤S401,对测量过静态弹性参数的水平岩芯D11B,D12B,D13B,…,D1mB进行X 衍射测量,获得地层深度D1处的粘土含量Vcl1;步骤S402,按照步骤S401的操作,对测量过静态弹性参数的水平岩芯Dn1B,Dn2B,Dn3B,…,DnmB进行X衍射测量,获得地层深度Dn处的粘土含量Vcln。
- 根据权利要求7所述的方法,其中,在步骤S4中,测量所述水平岩芯的粘土含量包括以下步骤:步骤S401,对测量过静态弹性参数的水平岩芯D11B,D12B,D13B,…,D1mB进行X衍射测量,获得地层深度D1处的粘土含量Vcl1;步骤S402,按照步骤S401的操作,对测量过静态弹性参数的水平岩芯Dn1B,Dn2B,Dn3B,…,DnmB进行X衍射测量,获得地层深度Dn处的粘土含量Vcln。
- 根据权利要求9所述的方法,其中,在步骤S4中,测量所述水平岩芯的粘土含量包括以下步骤:步骤S401,对测量过静态弹性参数的水平岩芯D11B,D12B,D13B,…,D1mB进行X衍射测量,获得地层深度D1处的粘土含量Vcl1;步骤S402,按照步骤S401的操作,对测量过静态弹性参数的水平岩芯Dn1B,Dn2B,Dn3B,…,DnmB进行X衍射测量,获得地层深度Dn处的粘土含量Vcln。
- 根据权利要求2-4、6、8、10-11和13-15中任一项所述的方法,其中,在步骤S5中,所述建立动静态弹性参数的比值与地层压力及粘土含量的函数关系式包括以下步骤:步骤S501,计算地层深度D1处的岩芯样品在P1-Pm中m个压力值下的动静态弹性参数的比值,分别记为Ed11/Es11,Ed12/Es12,Ed13/Es13,…,Ed1m/Es1m;构建地层深度为D1时的动静态弹性参数的比值与压力的关系;按照上述操作,计算地层深度Dn处的岩芯样品在P1-Pm中m个压力值下的动静态弹性参数的比值,分别记为Edn1/Esn1,Edn2/Esn2,Edn3/Esn3,…,Ednm/Esnm;构建地层深度为Dn时的动静态弹性参数的比值与压力的关系;步骤S502,压力值为P1时,计算岩心样品在D1-Dn中n个地层深度下的动静态弹性参数的比值,分别记为Ed11/Es11,Ed21/Es21,Ed31/Es31,…,Edn1/Esn1;根据获得的D1-Dn中n个地层深度的粘土含量Vcl1,Vcl2,Vcl3,……,Vcln,构建压力值为P1时的动静态弹性参数的比值与粘土含量的关系;按照上述操作,压力值为Pm时,计算岩心样品在D1-Dn中n个地层深度下的动静态弹性参数的比值,分别记为Ed1m/Es1m,Ed2m/Es2m,Ed3m/Es3m,…,Ednm/Esnm;根据获 得的D1-Dn中n个地层深度的粘土含量Vcl1,Vcl2,Vcl3,……,Vcln,构建压力值为Pm时的动静态弹性参数的比值与粘土含量的关系;步骤S503,根据步骤S501和步骤S502获得的关系,建立动静态弹性参数的比值与地层压力及粘土含量的函数关系式Ed/Es=f(P,Vcl)。
- 根据权利要求5所述的方法,其中,在步骤S5中,所述建立动静态弹性参数的比值与地层压力及粘土含量的函数关系式包括以下步骤:步骤S501,计算地层深度D1处的岩芯样品在P1-Pm中m个压力值下的动静态弹性参数的比值,分别记为Ed11/Es11,Ed12/Es12,Ed13/Es13,…,Ed1m/Es1m;构建地层深度为D1时的动静态弹性参数的比值与压力的关系;按照上述操作,计算地层深度Dn处的岩芯样品在P1-Pm中m个压力值下的动静态弹性参数的比值,分别记为Edn1/Esn1,Edn2/Esn2,Edn3/Esn3,…,Ednm/Esnm;构建地层深度为Dn时的动静态弹性参数的比值与压力的关系;步骤S502,压力值为P1时,计算岩心样品在D1-Dn中n个地层深度下的动静态弹性参数的比值,分别记为Ed11/Es11,Ed21/Es21,Ed31/Es31,…,Edn1/Esn1;根据获得的D1-Dn中n个地层深度的粘土含量Vcl1,Vcl2,Vcl3,……,Vcln,构建压力值为P1时的动静态弹性参数的比值与粘土含量的关系;按照上述操作,压力值为Pm时,计算岩心样品在D1-Dn中n个地层深度下的动静态弹性参数的比值,分别记为Ed1m/Es1m,Ed2m/Es2m,Ed3m/Es3m,…,Ednm/Esnm;根据获得的D1-Dn中n个地层深度的粘土含量Vcl1,Vcl2,Vcl3,……,Vcln,构建压力值为Pm时的动静态弹性参数的比值与粘土含量的关系;步骤S503,根据步骤S501和步骤S502获得的关系,建立动静态弹性参数的比值与地层压力及粘土含量的函数关系式Ed/Es=f(P,Vcl)。
- 根据权利要求7所述的方法,其中,在步骤S5中,所述建立动静态弹性参数的比值与地层压力及粘土含量的函数关系式包括以下步骤:步骤S501,计算地层深度D1处的岩芯样品在P1-Pm中m个压力值下的动静态弹性参数的比值,分别记为Ed11/Es11,Ed12/Es12,Ed13/Es13,…,Ed1m/Es1m;构建地层深度为D1时的动静态弹性参数的比值与压力的关系;按照上述操作,计算地层深度Dn处的岩芯样品在P1-Pm中m个压力值下的动静态弹性参数的比值,分别记为Edn1/Esn1,Edn2/Esn2,Edn3/Esn3,…,Ednm/Esnm;构建地层深度 为Dn时的动静态弹性参数的比值与压力的关系;步骤S502,压力值为P1时,计算岩心样品在D1-Dn中n个地层深度下的动静态弹性参数的比值,分别记为Ed11/Es11,Ed21/Es21,Ed31/Es31,…,Edn1/Esn1;根据获得的D1-Dn中n个地层深度的粘土含量Vcl1,Vcl2,Vcl3,……,Vcln,构建压力值为P1时的动静态弹性参数的比值与粘土含量的关系;按照上述操作,压力值为Pm时,计算岩心样品在D1-Dn中n个地层深度下的动静态弹性参数的比值,分别记为Ed1m/Es1m,Ed2m/Es2m,Ed3m/Es3m,…,Ednm/Esnm;根据获得的D1-Dn中n个地层深度的粘土含量Vcl1,Vcl2,Vcl3,……,Vcln,构建压力值为Pm时的动静态弹性参数的比值与粘土含量的关系;步骤S503,根据步骤S501和步骤S502获得的关系,建立动静态弹性参数的比值与地层压力及粘土含量的函数关系式Ed/Es=f(P,Vcl)。
- 根据权利要求9所述的方法,其中,在步骤S5中,所述建立动静态弹性参数的比值与地层压力及粘土含量的函数关系式包括以下步骤:步骤S501,计算地层深度D1处的岩芯样品在P1-Pm中m个压力值下的动静态弹性参数的比值,分别记为Ed11/Es11,Ed12/Es12,Ed13/Es13,…,Ed1m/Es1m;构建地层深度为D1时的动静态弹性参数的比值与压力的关系;按照上述操作,计算地层深度Dn处的岩芯样品在P1-Pm中m个压力值下的动静态弹性参数的比值,分别记为Edn1/Esn1,Edn2/Esn2,Edn3/Esn3,…,Ednm/Esnm;构建地层深度为Dn时的动静态弹性参数的比值与压力的关系;步骤S502,压力值为P1时,计算岩心样品在D1-Dn中n个地层深度下的动静态弹性参数的比值,分别记为Ed11/Es11,Ed21/Es21,Ed31/Es31,…,Edn1/Esn1;根据获得的D1-Dn中n个地层深度的粘土含量Vcl1,Vcl2,Vcl3,……,Vcln,构建压力值为P1时的动静态弹性参数的比值与粘土含量的关系;按照上述操作,压力值为Pm时,计算岩心样品在D1-Dn中n个地层深度下的动静态弹性参数的比值,分别记为Ed1m/Es1m,Ed2m/Es2m,Ed3m/Es3m,…,Ednm/Esnm;根据获得的D1-Dn中n个地层深度的粘土含量Vcl1,Vcl2,Vcl3,……,Vcln,构建压力值为Pm时的动静态弹性参数的比值与粘土含量的关系;步骤S503,根据步骤S501和步骤S502获得的关系,建立动静态弹性参数的比值与地层压力及粘土含量的函数关系式Ed/Es=f(P,Vcl)。
- 根据权利要求12所述的方法,其中,在步骤S5中,所述建立动静态弹性参数的比值与地层压力及粘土含量的函数关系式包括以下步骤:步骤S501,计算地层深度D1处的岩芯样品在P1-Pm中m个压力值下的动静态弹性参数的比值,分别记为Ed11/Es11,Ed12/Es12,Ed13/Es13,…,Ed1m/Es1m;构建地层深度为D1时的动静态弹性参数的比值与压力的关系;按照上述操作,计算地层深度Dn处的岩芯样品在P1-Pm中m个压力值下的动静态弹性参数的比值,分别记为Edn1/Esn1,Edn2/Esn2,Edn3/Esn3,…,Ednm/Esnm;构建地层深度为Dn时的动静态弹性参数的比值与压力的关系;步骤S502,压力值为P1时,计算岩心样品在D1-Dn中n个地层深度下的动静态弹性参数的比值,分别记为Ed11/Es11,Ed21/Es21,Ed31/Es31,…,Edn1/Esn1;根据获得的D1-Dn中n个地层深度的粘土含量Vcl1,Vcl2,Vcl3,……,Vcln,构建压力值为P1时的动静态弹性参数的比值与粘土含量的关系;按照上述操作,压力值为Pm时,计算岩心样品在D1-Dn中n个地层深度下的动静态弹性参数的比值,分别记为Ed1m/Es1m,Ed2m/Es2m,Ed3m/Es3m,…,Ednm/Esnm;根据获得的D1-Dn中n个地层深度的粘土含量Vcl1,Vcl2,Vcl3,……,Vcln,构建压力值为Pm时的动静态弹性参数的比值与粘土含量的关系;步骤S503,根据步骤S501和步骤S502获得的关系,建立动静态弹性参数的比值与地层压力及粘土含量的函数关系式Ed/Es=f(P,Vcl)。
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| CN109630098A (zh) * | 2019-02-15 | 2019-04-16 | 中国地质科学院地质力学研究所 | 一种利用岩芯测量差应力的方法 |
| CN111735696B (zh) * | 2020-07-02 | 2022-09-02 | 科吉思石油技术咨询(北京)有限公司 | 一种评价油气藏岩心样品地下原位杨氏模量的方法 |
| CN114112651A (zh) * | 2020-08-27 | 2022-03-01 | 中国石油化工股份有限公司 | 一种用于人造岩心的岩石动静态力学参数转换方法及系统 |
| CN119958979A (zh) * | 2025-01-27 | 2025-05-09 | 中国石油大学(北京) | 一种目标岩心的动静态力学参数转换关系确定方法及装置 |
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