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南海西部油田堵水技术研究
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摘要
在南海西部油田条件下,针对海上堵水存在问题,从堵剂配方、堵剂环保性能评价、堵水工艺和配套用剂这3个方面开展研究。常用堵剂中冻胶成本低廉、封堵对油水具有选择性、可笼统注入,适合于海上油田堵水。研究建立了南海西部油田条件的堵剂系列,包括常规冻胶和环保冻胶聚乙烯亚胺冻胶(PEI冻胶)。采用基液等粘度模糊评判法,综合考虑成本、冻胶强度和稳定性筛选聚合物,通过成冻对比优选PEI交联剂。研究得到了成冻时间和冻胶强度可调的系列配方,对典型配方进行了应用性能评价
     系统考察了温度、矿化度、聚合物、交联剂、pH值对PEI冻胶成冻时间和冻胶强度(储能模量和损耗模量)的影响,研究了PEI冻胶封堵的选择性。试验测定了南海海水配制PEI冻胶的表观活化能。温度、聚合物和交联剂是缩短成冻时间,提高冻胶强度的有利因素,矿化度则是不利因素,pH值在8~10时,降低pH值,成冻时间显著延长,冻胶强度明显降低。堵后驱替速度和油水相残余阻力系数的试验结果表明PEI冻胶的封堵对油水具有明显的选择性,该现象可由膨胀/收缩机理进行解释。
     建立了符合海上油田堵剂特点的环保评价方法。该方法选取海生菌明亮发光杆菌作为海洋环境的代表性受试生物,通过发光细菌急性毒性试验研究冻胶主剂、配方和产出液的环保性能。对冻胶的主剂、配方和产出液毒性进行了分级和排序,结果表明聚乙烯亚胺冻胶毒性远低于常规冻胶,冻胶的毒性主要源于交联剂,聚合物和交联剂在配方中表现的联合毒性作用为拮抗作用,冻胶因其封堵特性,产出液中毒性是逐渐缓慢释放。
     根据南海西部油田的出水类型分析了其适用的堵水方式,结果表明笼统堵水是最重要的工艺形式。针对南海西部油田的主要问题即大斜度井和水平井堵水,通过物理模拟研究了其笼统堵水的封堵机理和存在问题。为了在笼统堵水中更好的保护低渗通道,提出了聚合物保护海水增孔法,研究了该方法的影响因素,物理模拟的结果表明,与常规方法相比,该方法对低渗的保护效果更明显,堵水效果更好。研究了堵水工艺相关的各种配套用剂,包括前置液、后置液、暂堵冻胶和解堵工作液,在常规后置液段塞中增加了近井保护液,氧化降解近井残留的聚合物和冻胶,进一步降低过顶替后近井地带残余阻力系数,保证堵后足够的产液能力。
Under the condition of western zone oil field in South China Sea, plugging agent formulas and their toxicity, matching technology and their support agents were researched in the paper. Because of the feature of low cost and disproportional permeability reducing for oil and water, Gel is suitable for bullheaded water shutoff. In the paper, gel formulas research mainly include common gel and polyethyleneimine(PEI) gel. Serial gel formulars were obtained, having different gel time and gel strength. Then, the formulars were assessed by application characters such as water plugging rate, shearing resistance behavior, and etc.
     It was researched in detail how the factors, such as temperature, salinity, polymer, crosslinking agent, and pH value, affect gel time, loss modulus and storage modulus of PEI gel,. Apparent activation energy of South China Sea brine preparing gel was measured. Gel time power decline with the increase of polymer mass concentration. Gel time and PEI mass concentration has similar tendency. Increasing temperature, polymer and crosslinking agent mass concentration tend to shorten gel time and harden gel strength. While increasing salinity of brine for gel or decreasing pH value of base gel solution have invert tendency. Physical simulation results indicate that PEI gel can disproportionally reduce oil and water permeabilty obviously. The phenomenon can be interpreted by swelling/contracting mechanism.
     Environmental behavior evaluation method for shutoff agent in offshore oil field was researched. Photosbacterium phosphoreum was chosed as the representative specie for marine environment. Environmental behavior of polymer, crosslinking agent, gel and producing fluild after gel treatment was assessed by bioluminescent bacteria bioassay. The toxicity of different gel was graded and ordered. It was found that gel toxicity mainly attributes to crosslinking agent, and toxicity of polymer and crosslinking agent in gel shows antagonistic action.
     Bullheaded water shutoff was the most importand method in South China Sea western zone oil field. The mechanism of the method was researched by visual physical simulation. Polymer diverting and sea water broadening method was prososed to solve the problem discovered in the simulation, that the low permeable path was prone to be damaged in bullheaded water shutoff. The method was proven to be more effectively to protect the low permeable path and has more cheering results by physical simulation. Support agents for the matching technology of water shutoff were also researched, such as preflush fluid, overdisplacement fluid, temporary blocking gel and water block remover fluid. In the physical simulation, a little of oxidizing reagent solution was injected after overdisplacement polymer, to protect researvoir by degrading polymer and gel remaining near wellbore.
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