Chelate Acid Pulse Injection and Acidizing Stimulation Technology for Immobilized Injecting Well String
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摘要: 长庆油田低渗透砂岩油藏注水井受储层物性及注入水水质等因素的影响，高压欠注井逐年增多，而常规酸化增注技术工序复杂且有效期较短。为了提高酸化增注效果，简化施工流程，缩短措施占井周期，通过酸液体系配比试验、岩心驱替试验和缓蚀性能试验，研发了一种COA-1S酸液，该酸液具有较好的缓速、腐蚀和螯合抑制性能；通过工艺优化，将水力脉冲技术与酸化增注技术结合，提出了注水井不动管柱螯合酸脉冲式注入酸化增注技术，其具有施工不动管柱、不泄压、不返排等优点。该酸化增注技术现场应用了3井次，有效率100%，酸化后平均注水压力下降9.2 MPa，单井增注水量12.3 m3/d，取得了较好的效果。现场应用表明，该技术降压增注效果显著，解决了常规酸化工序复杂、占井周期长等问题，具有较好的推广应用前景。Abstract: The injection wells in the sandstone reservoirs in the Changqing Oilfield were affected by many factors including reservoir physical properties and water quality,resulting in increasing high-pressure and under-filled wells.Conventional acidizing and injection technology have a complicated process and their term of effective performance is very short.In order to improve the effect of acidizing and injection,to simplify the operation process,and to reduce the treatment time,we proposed a COA-1S acid fluid system for texts of the acid system ratio test,core flooding and corrosion inhibition performance.This system exhibits good retardation,anti-corrosion and chelation performance.The chelate acid pulse injection and acidizing stimulation technology were developed by means of a process of technique optimization,which integrates hydraulic pulse technology with the acidizing and injection technology.This technology has the advantages of immobilizing the string,does not require pressure relief,and there is no reverse discharge.This chelate acid pulse injection and acidizing stimulation technology for immobilized string of injecting well were been applied to three wells and times,with effective efficiency up to 100%.The average water injection pressure was decreased by 9.2 MPa after acidizing,and water injection volume for single well was increased by 12.3 m3/d,with quite good results.The field application demonstrated that the technology has an obvious effect in reducing pressure and increasing injection,which solved the problems of conventional acidizing technique in complex acidizing treatment process and a long well occupation time.It possesses good application and promotion prospects.
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Keywords:
- sandstone oil reservoir /
- water injection well /
- immobilized string /
- acid chelating /
- acidizing /
- injection increase /
- pulse
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