适用于渤海油田某水平井的EPMSC调剖技术

EPMSC Profile Control Technology Suitable for Horizontal Injection Well in Bohai Oilfield

彭齐国 黄 波 杨万有 陈维余 孟科全

PENG Qiguo，HUANG Bo，YANG Wanyou，CHEN Weiyu，MENG Kequan

为了优选适用于渤海油田某水平井的调剖技术，利用自制水平井调剖流动规律模型，考察了粉末聚丙烯酰胺凝胶与乳液聚丙烯酰胺凝胶体系、降压增注体系和颗粒类体系的注入性、耐温耐盐性和长期稳定性，并研究了几种调剖体系组合注入的适应性，确定了适合水平注水井乳液聚合物凝胶和自适应颗粒多段塞组合深部调剖技术（以下简称EPMSC调剖技术），并进行了矿场试验。研究结果表明，高分子量粉末凝胶体系的注入压力快速上升，高渗层的分流量高，而中低渗层的分流量极低，注入效果极差。乳液聚合物凝胶类、降压增注类及颗粒类体系的入井液黏度在 3~50 mPa·s 之间，注入性良好。这 3 类体系耐盐为 5×104~10×104 mg/L，耐温为 50~100℃，热稳定性为10~12个月。不同组合体系调驱后采收率为36.7%~43.6%，采收率增幅为13.6%~20.5%，降压增注体系可降低注入压力，但采收率增幅有限。EPMSC调剖技术具有良好的降压增注能力，在水驱基础上提高采收率幅度为20.3%。采用EPMSC调剖技术在渤海油田某水平井H井进行矿场试验，措施后注水压力稳中有升，视吸水指数下降幅度为36.5%；由霍尔曲线计算的视阻力系数和残余阻力系数分别为4.30和3.42，表明水流优势通道得到有效封堵，对应井组累计增油8414.5 m3。EPMSC调剖技术的成功应用，对整个渤海油田水平井注水开发油藏增产稳产具有重要意义。

In order to optimize the profile control technology suitable for horizontal injection well in Bohai oilfield，using the self-made horizontal well profile control flow model，the injectability，temperature and salt tolerance and long-term stability of the system，including the powder polyacrylamide gel and emulsion polyacrylamide gel system，the pressure reduction injection system and the particles system were investigated，the adaptability of several profile control system injections was studied，and the emulsion polymer gel and adaptive particle multi-segment combination（EPMSC）system，was determined and the field test was carried out. The results showed that the injection pressure of the high molecular weight powder gel system rised rapidly，the partial flow rate of the high-permeability layer was very high，while the partial flow rate of the medium-low permeability layer was very low，indicating that the injection effect of the high molecular weight powder gel system was extremely poor. The viscosity of emulsion polymer gels，depressurized injections and granules systems was in range of 3—50 mPa·s，and the injectionability was good. These three types of systems had a salt tolerance of 5×104—10×104 mg/L，a temperature resistance of 50—100℃，and a thermal stability of 10—12 months. The recovery rate of different combination systems after the regulation and control was 36.7%— 43.6%，and enhanced oil recovery rate was 13.6%—20.5%. The pressure reduction and injection system had certain advantages for reducing the injection pressure，but the effect of enhanced oil recovery was limited. It is considered that The EPMSC system had a good pressure-reducing and injection-increasing capacity，and the enhanced oil recovery rate was 20.3% based on the water flooding. EPMSC profile control technology was carried out in an H horizontal well in Bohai oilfield，the water injection pressure increased steadily after the measure，and the apparent water absorption index decreased by 36.5% . The apparent resistance coefficient and residual resistance coefficient calculated by the Hall curve were 4.30 and 3.42，respectively，indicating the dominant flow channel was effectively blocked，and the cumulative oil increase of the corresponding well group was 8414.5 m3，which was remarkable. The successful application of EPMSC profile control technology was of great significance in increasing the production and stable production of horizontal well water injection reservoirs throughout the Bohai oilfield.

10.19346/j.cnki.1000-4092.2019.03.013