川西下二叠统超深气井网络裂缝酸化优化设计

发布时间：2018-06-16 09:11

本文选题：四川盆地 + 西　；参考：《天然气工业》2017年06期

【摘要】：四川盆地西部下二叠统储层具有超深、高温、高压的特点,天然裂缝发育,钻井液漏失污染是制约该区储层增产改造效果的主要原因,酸化是彻底解除漏失污染的首选增产措施。为此,提出了最大限度降低污染表皮系数的酸化设计思路,建立了深层天然裂缝开启的临界排量计算模型;改进实验尺度天然裂缝岩样的酸化模型,建立了井筒条件下酸液有效作用距离和裂缝开度预测模型,在此基础上建立了网络裂缝酸化的表皮系数计算模型。现场应用结果表明:(1)当注酸排量为5.0 m~3/min时,S1-1井任意倾角的天然裂缝均能开启;(2)当注酸量大于100 m~3时,大排量注酸的优势逐渐体现;(3)以最大限度地降低表皮系数为目标,优选了S1-1井网络裂缝酸化的注酸排量为4.5 m~3/min,注酸量为210 m~3。S1-1井按照优化设计思路成功实施了网络裂缝酸化,获得了83.7×10~4 m~3/d的高产工业气流。结论认为:网络裂缝酸化技术是实现该区超深、高温、高压、天然裂缝发育储层增产改造最安全、经济、有效的模式。
[Abstract]:The lower two stack reservoirs in the west of Sichuan basin have the characteristics of ultra deep, high temperature and high pressure, natural fracture development and drilling fluid leakage pollution are the main reasons restricting the effect of reservoir production and transformation in this area. Acidification is the first choice to remove the leakage pollution. The critical displacement calculation model of deep natural fractures was established, and the acidification model of natural fractured rock samples was improved. The prediction model of effective action distance and fracture opening of acid liquid under well bore conditions was established. On this basis, the calculation model of skin coefficient of network fracture acidification was established. The results of field application showed that (1) when the quantity of acid injection was injected. At 5 m~3/min, the natural cracks of S1-1 well angle can be opened; (2) the advantage of large displacement acid injection is gradually reflected when the amount of acid injection is greater than 100 m~3; (3) to minimize the skin factor as the target, the optimum design idea is to optimize the acid injection rate of 4.5 m~3/min and the acid injection of 210 m~3.S1-1 well according to the optimum design idea. The network fracture acidification has been successfully implemented and the high production gas flow of 83.7 x 10~4 m~3/d is obtained. The conclusion is that the network fracture acidification is the safest, economical and effective mode to increase the production and transformation of the reservoirs with ultra deep, high temperature, high pressure and natural fracture development.
【作者单位】： "油气藏地质及开发工程"国家重点实验室·西南石油大学;西南石油大学博士后科研流动站;中国石油西南油气田公司工程技术研究院;
【基金】：国家自然科学基金杰出青年基金项目“低渗致密油气藏压裂酸化”(编号:51525404) 中国石油天然气集团公司科技重大专项“四川盆地深层高温高压含硫气藏储层改造技术研究与应用”(编号:2016E-0609)
【分类号】：TE377

【参考文献】