CAJ | 학술논문

通过砂岩微观孔隙模型模拟实验，分别对BaSO4和CaCO3结垢机理及结垢油层伤害规律进行了研究。研究结果表明：①油层结垢是在多次的异相成核—晶体生长过程形成的，晶体生长在孔隙中和喉道处均可发生；②不同类型结垢，其结垢特点不同。BaSO4结垢呈现出水混合—结垢交替间断进行及垢晶体晶形发育差、晶粒细小之特点，而BaSO3结垢呈现出连续进行及垢晶体晶形发育好、晶粒粗大之特点；③结垢油层伤害是一复杂问题，即使不考虑温度及多相渗流的影响，其仍受到结垢量和油层渗透性的双重影响。一般结垢量越大，油层渗透性越差，结垢对油层的伤害越严重。随油层渗透性变差，结垢量不同引起的结垢油层伤害程度的差异减小；随结垢量增大，渗透性不同，油层结垢伤害程度的差异减小。
통과사암미관공극모형모의실험，분별대BaSO4화CaCO3결구궤리급결구유층상해규률진행료연구。연구결과표명：①유층결구시재다차적이상성핵—정체생장과정형성적，정체생장재공극중화후도처균가발생；②불동류형결구，기결구특점불동。BaSO4결구정현출수혼합—결구교체간단진행급구정체정형발육차、정립세소지특점，이BaSO3결구정현출련속진행급구정체정형발육호、정립조대지특점；③결구유층상해시일복잡문제，즉사불고필온도급다상삼류적영향，기잉수도결구량화유층삼투성적쌍중영향。일반결구량월대，유층삼투성월차，결구대유층적상해월엄중。수유층삼투성변차，결구량불동인기적결구유층상해정도적차이감소；수결구량증대，삼투성불동，유층결구상해정도적차이감소。
By means of simulation experiments in sandstonemicromodels,scaling mechanism and formation damage due to scaling of BaSO4 and CaCO3 are studied respectively. The results show:1)Formation scaling is formed in the repeated heterogeneous-phase nucleation and crystal growth. The crystal can grow both in pores and at throats. 2)The characteristics of scaling are different for different scales. BaSO4 scaling develops intermittently in the alternate process of water mixing and scaling, the morphology of the scale crystals develops poorly and the crystals are fine.While CaCO3 scaling develops continuously,the morpholgy of the scale crystals develops perfectly and the crystals are large. 3)The formation damage due to scaling is a complex problem,even if effects of temperature and multiphase flow are excluded,it is still affected by the amount of scale and formation permeability. In general,the larger the amount of scale is or the lower the permeability is,the severer the formation damage is.As the permeability of formation decreases,the difference of formation damage decreases due to different amount of scale. As the amount of scale increase,the difference of formation damage decreases in formations with different permeability.