春光油田低温稀油油藏泡沫+树脂固砂技术

Foam+resin based sand consolidation technology for low-temperature thin oil reservoir in Chunguang Oilfield

针对春光油田低温稀油油藏采油井细粉砂出砂严重的问题,研制了泡沫+树脂固砂体系。实验以改性三聚氰胺甲醛树脂为主剂,以抗压强度和渗透率为指标确定了固化剂、起泡剂、稳泡剂等组分质量分数,考察了气液体积比、扩孔方式等对固结性能的影响,形成了泡沫+树脂固砂体系。通过反向冲刷实验,确定了固砂深度。实验结果表明,以N_(2)为气相、SDS为发泡剂、CMC为稳泡剂、酸式盐和有机酸混合物为固化剂的泡沫+树脂固砂体系具有低密度、高强度和高渗透的特点,25℃时固结体密度为0.54~0.62 g/cm^(3),抗压强度达到6.12 MPa,渗透率达到1.76μm^(2)。截至2020年12月,在春光油田开展泡沫+树脂固砂技术现场试验27井次,平均检泵周期由35 d延长至112 d,取得了良好的防砂效果。

In this paper,the foam+resin based sand consolidation system was developed to deal with the serious fine siltstone production of the oil production wells in the low-temperature thin oil reservoirs of Chunguang Oilfield.In the experiment,the modified melamine formaldehyde resin was used as the raw material,the mass fractions of solidifying agent,foaming agent,foam stabilizer and other compositions were determined by taking compression strength and permeability as the indicators,the influences of gas/liquid volume ratio and reaming mode on the consolidation performance were investigated,and thus the foam+resin based sand consolidation system was developed.In addition,the solid consolidation depth was determined by means of back scour experiment.It is experimentally indicated that the foam+resin based sand consolidation system which takes N_(2) as the gas phase,SDS as the foaming agent,CMC as the foam stabilizer and mixed acid salt and organic acid as the solidifying agent is characterized by low density,high strength and high permeability.At the temperature of 25℃,the consolidation body has density of 0.54-0.62 g/cm^(3),compression strength of 6.12 MPa and permeability of 1.76μm^(2).By December 2020,the foam+resin based sand consolidation technology had been tested on site 27 well times in Chunguang Oilfield and the pump detection period is extended from 35 d to 112 d,indicating good sand control effects.