深井薄层稠油油藏水平井注采参数优化设计

Optimization of injection and production parameters on horizontal well of thin heavy oil reservior in deep well

张巧莹

Zhang Qiaoying

中国石化胜利油田分公司地质科学研究院，山东 东营 257015

Geological Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China

针对深井薄层稠油油藏注蒸汽散热效应较厚油层大的特点，在蒸汽吞吐增产机理分析的基础上，运用经济概算、数值模拟、分析类比方法，计算了热采水平井经济布井界限，重点对初期注汽强度、注汽强度周期递增量、初期排液量主要注采参数进行优化设计。研究结果为：水平井极限布井厚度为3 m，水平段长度200 m，位于油层中下部，初期注汽强度为12 t/m，将多个吞吐周期分为3个阶段，每个阶段的注汽强度周期递增量分别为20%，10%，0%，合理的注汽速度为10 t/h，初期采液量应控制在35 t/d。矿场应用取得很好的开发效果，该项研究成果为该类油藏的高效开发热采水平井提供了现场实施依据。

Aiming at the characteristics of steam injection heat-radiating effect in thin heavy oil reservoir in deep well, which is stronger than that of thick reservoir, on the basis of steam stimulation mechanism analysis, economic well spacing boundary of horizontal well of heat recovery is calculated through the use of economic budget，numerical simulation and analysis analogy methods. Initial steam injection intensity, cycle increasing strength of steam injection and main injection?鄄production parameters of initial fluid delivery are optimized. The study results show that the ultimate well spacing thickness of horizontal well is 3 m, the length of horizontal section is 200 m, and initia steam injection intensity is 12 t/m in the mid-lower part of reservoir. Stimulation cycles can be divided into three stages, cycle increasing intensity of steam injection is separately 20%, 10% and 0% for each stage. Reasonable steam injection rate is 10 t/h and initial fluid withdrawal rate should be controlled at 35 t/d. A good development effect has been acquired in the process of field application. The study result provides the field basis for high-efficiency development of horizontal well of thermal recovery in the similar reservoirs.

10.6056/dkyqt2012z1014