新场JS致密砂岩气藏开发中后期加密界限研究

A Study on the Threshold of Infiltration Adjustment of Tight Sandstone Gas Reservoir in the Middle and Late Stages of Development

刘言 刘露

LIUYan LIULu

中国石化西南油气分公司, 四川 成都 610041 中国石化西南油气分公司勘探开发研究院, 四川 成都 610041

Southwest Oil & Gas Company, SINOPEC, Chengdu, Sichuan 610041, China Exploration & Production Research Institute, Southwest Oil & Gas Company, SINOPEC, Chengdu, Sichuan 610041, China

加密调整作为开发中后期气藏提高采收率的主要手段之一，但目前加密调整界限模糊，调整效果不尽理想。以典型致密砂岩气藏新场JS气藏为例，以经济评价为依据，利用动态分析及数值模拟技术，研究不同储量区加密调整经济技术界限，提出针对性的技术对策。研究结果表明： 1） I类储量区加密调整界限：地层压力大于原始地层压力的59%，直井和水平井均可；当储量丰度大于4.96×10 m/km，水平井更优；地层压力仅为原始地层压力的47%~59%只适用于直井。2） II类储量区：地层压力大于原始地层压力的67%且储量丰度大于2.03×10 m/km直井及水平井均可，储量丰度小于2.20×10 m/km适用于直井，储量丰度大于2.34×10 m/km水平井更优；地层压力为原始地层压力的51%~67%，只适用于直井。3） III类储量区：仅水平井适宜加密调整，且地层压力大于原始地层压力的88%，储量丰度大于1.30×10 m/km。4）通过加密调整，预测增加可采储量4.02×10 m，提高采收率0.67%。

Infiltration adjustment is one of the main methods to improve recovery in the middle and late stages of gas reservoir development, but the adjustment effect is not ideal at present due to the inadequate understanding of threshold of adjustment implementation. Taking the typical tight sandstone gas reservoir of Xinchang JS as an example, we study the economic and technical threshold for infiltration adjustment of different reserve areas through economic evaluation, dynamic analysis and numerical simulation, and put forward specific technical suggestions. In type I reserve area adjustments should be made to both vertical and horizontal wells when the formation pressure is greater than 59% of the original formation pressure; when the reserve abundance is greater than 4.96×10 m/km, adjustments should be made to horizontal wells; when the formation pressure is at 47%~59%, adjustments should be made to vertical wells only. In type II reserve area, when the formation pressure is greater than 67% and reserve abundance is greater than 2.03×10 m/km, adjustments can be made to both vertical and horizontal wells; when reserve abundance is less than 2.20×10 m/km, adjustments should be made to vertical wells, and when reserve abundance is greater than 2.34×10 m/km, adjustments should be made to horizontal wells; when the formation pressure is at 51%~67%, adjustments should be made to vertical wells only. In type III reserves area, adjustments can be made only to horizontal wells when the formation pressure is greater than 88%of the original formation pressure and reserve abundance is greater than 1.30×10 m/km. Ti is estimated that recoverable reserves can increase by 4.02×10 m and recovery by 0.67% through infiltration adjustment.

10.11885/j.issn.1674-5086.2021.06.15.01