泌阳凹陷深层系油气层损伤因素及保护与改造技术

DAMAGE FACTOR AND PROTECTION AND STIMULATION TECHNIQUES OF DEEP RESERVOIRS IN BIYANG SAG

王敏 秦伟军

Wang Min Qin Weijun

泌阳凹陷深层系主要指核桃园组三段下亚段V砂组至大仓房组,属于低孔低渗储层,油气层损伤因素较为复杂,其中以粘土物质分散运移及外力作用影响最大,在钻井、完井及射孔试油过程对油气层造成较大损害,使应该发现的油气层没被及时发现,同时低孔低渗油气层产能较低,必须通过有效的改造措施才能使单井产能提高。通过研究,形成了适合低孔低渗油气层保护的优质钻井液配方、合适的屏蔽暂堵及先进的聚合醇油保技术、优质射孔液及负压射孔油保技术等。改造方面,优选出耐温能力强、配伍性好、低摩阻、携砂能力强的压裂液,并推广应用先进的大型压裂工艺技术,在赵凹-安棚等地区起到十分显著的效果。

The deep reservoirs are mainly referred to as the 5th sand layer in the lower part of the 3rd member of Hetaoyuan Formation and Dacangfang Formation in Biyang sag,they are characterized by their low porosity and low permeability.These oil/gas reservoirs have been damaged heavily in the course of drilling,well completion, perforation and testing.As a result,the oil/gas reservoirs would often be difficult to be found,and the productivity of those reservoirs with low porosity and permeability would be relatively low.Well productivity can only be increased by stimulation treatment.Through various studies, reservoir protection and stimulation techniques, such as formula of high quality drilling fluid, temporary plugging method and advanced reservoir protection technique with polymeric alcohol,high quality perforation fluid and underbalanced perforation,have been applied,and significant results have been obtained in Zhaowa-Anpeng area.As for stimulation, optmimization of high quality fracturing fluid has also been made,which are characterized by its heat-resisting quality,good compatibility, low friction resistance,and high proppant-carrying capacity.Besides,application and dissemination of large-scale fracturing technology have also been made in Zhaowa-Anpeng area,which prove to be highly effective.

10.11743/ogg20030418