Study In Gas Reservoirs With Low Porosity Permeability And Low Pressure

The study about reasonable development mode has important menaing to everygas field·The determination of reasonable development mode can cut downinvestment and improve the development efficiency and economic benefit of theWhole gas field.In this paper though studying the tectonic characteristic, reservoirs physicalproperty, heterogeneity in He-3 Member of Daniudi gas field,a comprehensivecognition about geology characteristic in exitra-low permeability porous,pressure.Onthe basis of the cognition,developing performance analysis,acording to the standard ofproduct size,it will be divided into three types,such as high-productivity,medium-productivity and low-productivity,and it will be analyzevd changes of gas,water and Producing Pressure between tubing and casing.And it will be divided intofour types,rising water production,declining water production,stable water productionand irregular water production then analyse the effect factors of production, and judgethe reasonableness well production. Analysis of production decline rule and pressuredecline,studing pressure prediction. Most gas well have stable production period for 5years.this can tell us when to provide compressor.The production is rising before2005,and then start produce stably.At the same time,the formation pressure is deliningand it fell more quickly in 2006. How to maintain the formation energy andcontinuous stable production of the gas reservoir need to be resolved. Summarize thedevelopment mode of various domestic and international gas fields, and tihen contrastand analyze the similarities and differences of various types of gas field developmentmode which provides theoretical basis for the study of. He-3 gas.Combininggeological characteristics and dynamic characteristics, determines the reservoirdevelopment principle,development layer, development,reasonable gas velocity, andcombines single well controlled reserves, open flow and stable conditions to determine the reasonable allocation of single well production. and combines bottomhole liquid situation to determine reasonable production pressure. Using single wellproduction by the provisions of law, economic evaluation method, analogy methoddetermines the form of Integrated Well, well spacing and well density.Finally contrastthe predicted development index of developing plan in 2004 and the actualproductionevelopment index, and then put forward comprehensive revision proposalgas reservoir. Now gas production rate has reached 5.77%, and it force reservoirpressure drops rapidly and affect the ultimate recovery of gas reservoirs. Soappropriate control box 3 gas reservoir gas production rate of between 2.5 to 3%.Appropriate adjustments well. Use Batch production well where some of the welldensity area is too large. While increase some wells appropriately where the wellspacing is too large and where the use of reserves can not control that the He-3 gasfield can uniformly produce. Propose play Horizontal and use sub-fracturingtechnique reduce the number of production wells that can reduce the number ofproduction wells and substantial increase individual-Well Productivity, and extendedperiod of stable gas reservoir. With the lower pressure of gas reservoir, timely use ofpressurized gas transmission technology that can extend the life of gas wells andImprove the ultimate recovery ration of gas reservoirsThe results of this paper has instructional meaning to He-3 gas field in keepingthe formation pressure,and insisting on stable production,in changing the large-scaleproduction and improving the development technology.It also can provide theoreticalbase for effective mode and production technology in devolping other gas field whichare exitra-low permeability porous,pressure,too.