SZ36-1油藏出砂对渗透率影响及出砂规律实验模拟

油井出砂给油田生产带来消极影响，也在一定程度上提高油层渗透率，从而提高油井产能。为深入认识适度出砂提高油井产能机理并为现场实施提供理论依据，通过物理模拟实验研究出砂对储集层渗透率的影响和出砂规律。以渤海SZ36—1油藏砂样为研究对象，进行砾石充填和金属筛网防砂实验，分析不同完井方式下压差、出砂与产能之间的关系以及蚯蚓洞及其网络形成情况。实验结论是：适度出砂开采时宜采用筛管或割缝管完井方式；出砂提高了地层渗透率并形成蚯蚓洞网络，能提高油井产能；压力扰动对出砂有显著影响，出砂量与产油量相互依存，随着砂粒不断采出，原油产量不断增加。图5参8

Influences of sand production on permeability and experiments on sand production characters in SZ36-1 Oilfield

Sand production brings negative influences on oilfield development, but it also increases the reservoir permeability and enhances productivity. In order to further understand the influences of moderate sand production on productivity enhancement, physical experiments were carried out to simulate the influences of sand production on permeability and to study the sand production performance. Taking the samples from the SZ36-10ilfield in Bohai Bay Basin as example, gravel-pack and sieve sand controlling experiments were carried out to analyze the relationship between pressure drop, sand production and productivity, and to study the formation of wormholes and their network. The results indicate that sieve or liner completion should be used for producing with controlled sand production; sand production enhances permeability of formation, creates wormholes, and thus enhances productivity; the perturbation of pressure plays an important role in .sand production, and the oil production rate is directly proportional to the sand production rate.