超深层碳酸盐岩气田产能评价的扩展“一点法”

Extended "one point method" for productivity evaluation of ultra-deep carbonate gas fields

蔡珺君 彭先 李隆新 刘微 李文 王蓓 邓庄

中国石油西南油气田公司勘探开发研究院，四川 成都 610041 中国石油西南油气田公司川中油气矿，四川 遂宁 629000

超深层碳酸盐岩气田普遍具有基质致密、裂缝发育和强非均质性的特点，采用常规“一点法”对其进行的产能评价结果与矿场实际产能之间存在着显著矛盾。文中在回顾“一点法”理论和应用的基础上，明确了“一点法”产能评价的概念、内涵及应用局限；以安岳气田为实例，建立了视均质、缝洞Ⅱ型、孔洞Ⅰ型、孔隙Ⅱ型4类典型储层的经验数描述和试气测试时间与转换系数关系图版，并导出了不同试气测试时间下的扩展“一点法”计算公式。矿场应用结果表明：扩展“一点法”的适用条件为气井试气测试资料与生产资料中的油压、产量数据具有较好的一致性；与常规“一点法”相比，扩展“一点法”可提升视均质、孔洞Ⅰ型、孔隙Ⅱ型3类储层的产能评价可靠性。新方法的建立及应用为评价气井初期产能与合理制定超深层碳酸盐岩气田开发技术对策奠定了基础。

Ultra-deep carbonate gas fields generally have the characteristics of dense matrix, fracture development, and strong heterogeneity. There was a significant contradiction in the field application of the conventional "one point method" productivity evaluation. On the basis of reviewing the theory and application of "one point method", the concept, connotation and application limitations of "one point method" productivity evaluation were clarified. Taking Anyue gas field as an example, the empirical number description of four typical reservoirs of apparent homogeneity, fracture-cavity type Ⅱ, pore-cavity type Ⅰ and pore type Ⅱ and the diagram of the relationship between oil test time and conversion coefficient were established, and the extended "one point method" calculation formula under different oil test time was also derived. The field application results show that the applicable condition of the extended "one point method" is that the oil test data were consistent with the pressure and production data in the production data. Compared with the conventional "one point method", the extended "one point method" can improve the reliability of productivity evaluation of apparent homogeneity, pore-cavity type Ⅰ and pore type Ⅱ reservoirs. The establishment and application of the new method have laid a solid foundation for evaluating the initial productivity of gas wells and reasonably setting the technical development countermeasures of ultra-deep carbonate gas fields.

10.6056/dkyqt202204003