大港油田多涂层预包防砂支撑剂研制与应用

Development and Application of Multi-Coated Pre-Encapsulated Sand Control Proppant in Dagang Oilfield

针对浅层低温(低于50℃)防砂井化学材料难以固结、影响防砂效果的问题,研制了一种不需要外固化剂,就具有低温快速固化且高强度特点的多涂层包胶防砂支撑剂。从树脂胶结体系选择、固化体系选择、外包胶材料及包胶工艺选择、颗粒配方等方面进行了多涂层预包防砂支撑剂配方的研究。研制的防砂支撑剂分为A剂和B剂,其中A剂为树脂胶结支撑剂,B剂为树脂固化支撑剂。对该支撑剂进行了性能评价,包括固化温度和固化时间对人工岩心固结强度和渗流能力的影响评价、耐酸碱介质性能评价、岩心稳定性及其他性能评价。性能测试发现,A剂和B剂按质量比1:1充分混合,在25℃下固化4 h后抗压强度能达到6 MPa以上,液相渗透率大于1μm^2。该防砂支撑剂在大港油田现场应用4口井,结果表明,该防砂支撑剂能够解决低温出砂井、生产大压差并、注水井和侧钻井的防砂难题,且防砂效果良好。

In order to solve the problem of chemical material＇s difficult to consolidate in shallow low tempera ture wells （below 50 ℃）. A multi-coated pre-eneapsulated sand control proppant was developed which can consolidate quickly with high strength in low temperature without external curing agents. The formula of this consolidating system, multi-coating pre-encapsulated process, evaluation of proppant properties and field application were dis- cussed. This proppant consists of component A and B,in which component A is resin consolidating proppant and B is resin curing agent. When component A with B were mixed completely at a ratio of 1 ： 1,they can consolidate in water at 25 ℃ and the compression strength is higher than 6 MPa and its liquid permeability exceeds 1 μm^2. This proppant has been used in 4 wells. The results showed that it is a novel chemical sand control propping agent and can solve the problem of sand control in low-temperature sand production wells, high production pressure wells, water injection wells and side tracking wells.