Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

Effects of Foam Injection Methods on Plugging Efficiency

Yang Hao (MOE Key Laboratory of Petroleum Engineering in China University of Petroleum,Beijing 102249)  
The effects of different injection methods including gas-liquid simultaneous injection,sectional alternating injection,gas-liquid-gas injection,gas-liquid-gas injection(containing oil),gas-liquid-gas injection(no foaming agent),and gas-liquid-gas injection,on the resistance coefficient,breakthrough pressure and plugging efficiency were compared.The result showed that for gas-liquid-gas,pregas slug isolated oil and water zones,made foam stable,subsequent gas slug displaced foam into deep formation,amplified swept volume,raised foam quality,breakthrough pressure was the largest at 1.033 MPa,plugging efficiency was also the highest,so it was the best injection method.Sectional alternating injection method could displace gas and foam agents to deep formation,broadened swept volume.Adsorbing of foam agents in cores improved the foam stability,but the method had more operations.Simultaneous injection method was difficult to gain the designed gas/liquid ratio in laboratory and field.When injection pressure gradient was high,it was difficult to inject,otherwise no plugging effect.Preliquid slug of liquid-gas-liquid lost greatly,sequent injected foam agents decreased the foam quality and damaged the foam stability and plugging intensity.The liquid film viscosity of gas-liquid-gas disperse system(no foaming agent) was low,plugging intensity was also low.The effects of oil content in foam system on the plugging were examined.The result showed that the presence of oil only increases outflow velocity,not obviously affected plugging efficiency.
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved