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对于大庆油田处理注水井近井地带所用的HPAM/Cr3 + 冻胶调剖剂 ,要求调剖剂溶液在井温条件下 (4 5℃ )成胶时间在 10— 30h范围内可调 ,形成的冻胶强度高 (以表观粘度表示 ,为 5× 10 4 — 1.5× 10 5mPa·s) ,因此需要使用性能符合要求的延缓型交联剂。实验考察了 3种氧化还原型铬交联剂交联 1%HPAM水溶液的能力。重铬酸钠 /木质素磺酸钠氧化还原体系使溶液成胶的配比范围很窄且成胶速率过高 ,成胶时间太短。重铬酸钠 /硫脲氧化还原体系只有在重铬酸钠用量很高时 (≥ 1.5 % )才能使溶液延缓成胶 ,这在经济上是难以接受的。适当配比的重铬酸钠 /木质素磺酸钠 /硫脲氧化还原体系 (延缓型铬交联剂MLH 1) ,可使HPAM溶液的成胶时间在 5— 30h范围内调节 ,形成的冻胶表现粘度一般大于 1.5× 10 5mPa·s。以本质素磺酸钠与重铬酸钠间的诱导反应 ,硫脲与重铬酸钠间的受诱反应解释了MLH 1的延缓交联作用。HPAM /MLH 1体系已成功地用于大庆油田 36口注水井近井地带的调剖作业。
For HPAM / Cr3 + gel profile control agent used in Daqing oilfield near injection well, it is required that the profile control agent solution can be adjusted within the range of 10-30h under well temperature (45 ℃) Jelly strength is high (expressed in terms of apparent viscosity, 5 × 10 4 - 1.5 × 10 5 mPa · s), so a delaying crosslinker having satisfactory properties needs to be used. The experiment investigated the ability of 3 kinds of redox type chromium cross-linking agent to cross-link 1% HPAM aqueous solution. Sodium dichromate / sodium lignosulfonate redox system to make the ratio of the solution to the gel is very narrow and the rate of plasticization is too high, gel time is too short. Sodium dichromate / thiourea redox systems can delay the solution gelling only at very high levels of sodium dichromate (≥ 1.5%), which is economically unacceptable. Proper proportion of sodium dichromate / sodium lignosulfonate / thiourea redox system (delayed-type chromium crosslinker MLH 1) can adjust the gelation time of HPAM solution within the range of 5 to 30 h, resulting in a frozen The gel exhibits a viscosity of generally greater than 1.5 × 10 5 mPa · s. Induction reaction of sodium sulfonate with sodium dichromate and induced reaction between thiourea and sodium dichromate explain the delayed crosslinking of MLH 1. The HPAM / MLH 1 system has been successfully used for profile control of 36 injection wells in Daqing Oilfield.