摘要
为了治理华北油田砂岩油藏油水井的窜漏,研制了一种高渗入性的可固化合成树脂基封窜堵漏剂,该剂基本配方如下:60%～80%改性酚醛树脂+5%～25%不饱和聚酯树脂+1%～3%固化剂+1%～5%促进剂+5%增塑剂+5%增强剂+其他添加剂.根据地层温度(40～110℃)配制的8个配方封窜堵漏剂,在各该温度下的固化反应开始时间(由粘时曲线测定)可延迟3～8小时,固化后的抗拉强度为12.5～10.8 MPa,抗压强度为13～87 MPa,抗剪切强度为20.0～9.2 MPa,在10%盐酸、10% NaOH溶液、10% NaCl溶液中浸泡24 h的溶蚀率＜1%,与砂混合固化后,射孔弹穿透深度远小于水泥石.自2001年以来使用该剂在华北油田3口油井实施封层、2口油井实施封窜,其中包括储层渗透性很低的井和套管补贴后失效的井,封堵率均为100%,施工后的井生产中承压14～19 MPa,已正常生产1～3年.图8表2参3.
A series of highly permeating curable sythetic resin base sealing fluids （CFs） are developed for channelling and leakoff blockage in oil production and water injection wells of sandstone reservoirs in Huabei oil fidds and their basic recept consists of 60- 80% modified phenolic resin, 5-25% unsaturated polyester resin, 1-3% curing agent, 1-5% promotor, 5% plasticizer, 5% reinforcer, and other additives. For 8 grades of CF8 formulated for use at different formation temperatures ranged in 40-110℃, a retardation time of 3-8 hrs in their crosslinking/curing reactions is determined on their viscosity vz temperature curves. For the cured CFs, the tensile, compression and shear strength is in range 12.5-10.8, 13-87,and 20.0-9.2 MPa, respectively, the dissolution rate in 10% HCl, 10% NaOH and 10% NaCl solutions is〈 1% and ,when mixed with sand, the perforation penetration by bullets of different size is much less than that for set oilwell cement. These CFs have been used since 2001 in 3 production wells for water producing layer plugging and in 2 production wells for channelling blockage （in one well the pay layers are rather low permeable and in another the patching in casing has failed） with 100% plugging rate; with the sealing jobs finished, these wells have worked normally without troubles over more than 1-3 years under pressures 14-19 MPa.
出处
《油田化学》
CAS
CSCD
北大核心
2005年第4期299-301,共3页
Oilfield Chemistry
关键词
封窜堵漏剂
合成树脂复配体系
延迟固化
配方研究
力学性能
封窜堵漏
现场试验
华北油田
sealing/plugging agent
synthetic resins compositions
retardation of curing
formulations
mechanical proper＇ties
plugging of channellings and leakages
field tests
Huabei oil fields
