Banqiao Condensate Oil And Gas Reservoir Development Technology Research

Banqiao condensate oil and gas reservoir developmenttechnology researchAbstractThe development of the condensate oil and gas reservoir requires not only a higher natural gas recovery, but also a higher condensate oil recovery that is more important. The former is easy to be achieved, but the latter is very difficult. This paper presents a view that it is necessary to research the condensate oil and gas reservoir geological casesand conditions, what's more, a set of new development technology is required.Banqiao condensate oil and gas reservoir is among the condensate oil and gas fields which had been exploited earlier in China. Undergoing nearly thirty years?developing, a lot of experience is accumulated. The result is satisi~ring in increasing condensate oil and gas recovery. Some valuable specific practices for increasing condensate oil recovery by depletion development way from the case histories of exploitation are found. These experiences are very useful for enhancing oil recovery.By analyzing the case history of the development of the Banzhong Ban II oil group, this paper emphasizes it is very important to make it clear where is the oil-gas contact and where is the oil-water contact and whether there is edge water energy. Application is successful in extracting the oil-ring first by making full use of gas cap's energy, extracting oil and gas by descenting abandoned-pressure, and adopting proper well location. Bring up the discussion on improving condensate oil recovery by supplying energy and applying proper developing technology.Based on the predecessor's working, in the development research of Dazhangtuo condensate gas reservoir by recycling gas injection there are some new cognition and some creation:(1)resolve the problem how to recover the original fluid sample of Dazhangtuo condensate gas reservoir. (2)make a quantitive research on retrograde condensate side-role of the condensate gas reservoir, which there will be a loss of 50 percent when reservoir's pressure drops 5.OMPa below dew point pressure in the early period of retrograde condensate phenomenon.(3)apply the research on compositional model of D+S company of Canada which is 3D,3-phase and 7 compositions andIIcompositonal simulation technology, resolve the problem how to describe the changes of the fluid抯 component and property, what抯 more, optimize the project.(4)utilize electronic pressure meter detecting-marginal testing technology to measure accurate pressure and peripheral fault of gas reservoir, that is creative in on-site monitoring. (5)establish a set of producting performance monitoring system whose major aim is to gain datas of pressure, fluid component and tracer monitoring. For example, in pressure-monitoring for getting practical pressure data, adopt shutting all wells for measuring pressure. These accurate datas offer evidences for project adjustment, the result is satisfying. The project of Dazhangtuo condensate gas reservoir recycling gas injection development and performance monitoring technology applying was awarded as 揳 new technology for high development efficiency ?by CNPC in June,1999.Aimed at the abandoned reservoir potentialilities by the depletion development way and the practicality of water injection,a test has been done.Result shows the proper water injection development can enhance condensate oil and gas recovery.