河南油田聚合物地面分质分压注入工艺技术

随着注聚区块的不断开发,河南油田注聚井况越来越复杂,油藏非均质性严重,层间矛盾突出,渗透率级差大,因此,研究应用了聚合物地面分质分压注入工艺技术。通过同心双管分注管柱封隔地层,形成三个独立的注水通道,对高渗透地层安装低剪切配注器,产生节流压差,控制流量;对低渗透层安装定量剪切配注器,增加聚合物黏损率,降低聚合物分子量,使聚合物分子量与地层渗透性能匹配;试验表明,注聚工艺不仅简化了测试调配工艺、缩短了测试时间、降低测试费用,还真正做到了测试调配的及时、准确,保证了地质方案的时效性,提高了聚合物分注的驱油效果。

Technology of polymer surface injection by mass and pressure separation in Henan oilfield

with the continuous development of polymer injection blocks, the situation of polymer injection wells becomes more and more complex. At present, most of the polymer injection units are second level or third level reservoirs with serious reservoir heterogeneity, prominent inter-layer conflicts and large permeability differential. Therefore, the technology of polymer surface mass and pressure separation injection is equipped to meet the requirements of the polymer mass and pressure separation injection in the second level and third level oil reservoirs. The formation is sealed by concentric dual injector string, forming three independent water injection channels, and low shear injector is installed in the ground face of high permeability formation to produce throttling pressure difference and control flow rate. The quantitative shear injector is installed in the low permeability layer to increase the viscosity loss rate of the polymer and reduce the molecular weight of the polymer, so that the molecular weight of the polymer matches the permeability of the formation. It not only simplifies the test preparation process, shorts the test time and reduces the test cost, but also makes the test deployment timely and accurate, ensures the timeliness of the geological plan, and makes up for the shortcomings of the existing ground mass and pressure injection process, and further improves the oil displacement effect of polymer injection.