The Study On The Of The Materials Recorded And The Appraisal Methods Of Gas In Deep Layers In Daqing Explorational Area

During the administration of gas reservoir production ,,it is essential to precisely known the specialty of the gas layer and forecast the production capacity of the gas well.;Obtaining the pressure of the bottom of the well is the premise and the foundation to analyzing the dynamics of the producing rightly in oil and gas well.;It is not only increased the amount of daily production per well but also can eliminate the depositing fluid if use the rational parameter. Thus direct the measuring production.It is a very effective means to measuring the pressure of the bottom of the well through the information of the mouth of a well. It can substitute the means of pressure measuring under well. If have the well-working model to precisely calculate the pressure of the bottom of the well, it just need to put the pressure gauge to the enough depth , need not put the well pressure gauge at the bottom of the well in case the expensive expenditure of the deep well measuring . Furthermore, the effect of this means is more outstanding to the over-deep, over high temperature and high pressure well. So the studies about the subject is significant and necessary as an economical and convenient means to calculate the pressure of the bottom of the well. Though known the law of fluid flowing in the vertical pipe and the law of gas flowing,after further study the trait of gas-fluid facies flowing and the law of flowing . Though above studies ,let us known more about the flowing changing of the fluid in the pipe . From researching the composition of natural gas, deeply analyze the natural gas composition, category, density, solubility and compressibility etc physical and chemical quality. Allow for all sorts of the influence element, including how the oil pipes affect the discount of pressure of the bottom of the well; pave the way for preparation the calculating formula.Improve and select the calculating formula so as to the pressure of the bottom of the well. Using a mount of discounting formulas to conclude the most representative formula .Meantime, add up some ignored elements.Generally, divide into discount calculating of static pressure and variable pressure , specific formula :â‘ the calculating formula of discount pressure in pure gas reservoir;â‘¡the calculating formula of discount pressure in gas reservoir with water producing involved;â‘¢the calculating formula of discount pressure at the bottom of cracked well .Programmed all selected formulas, finally, present the installable calculating software. This software have clear interface, powerful function, can both calculate the single dot data and the bulk data. Though the outcomes from different well, can get the accuracy criteria demanded. Has carried on the gas, fluid two vertical pipe flowing the bottom static pressure and the flowing pressure conversion software application: Has altogether calculated 30 wells bottom static pressures and the flowing pressure using bottom well pressure conversion software, including several wells, but also includes several gas-water producing the well .And the result is precise to practically measured data, which can make out the model of the software isup to grade. Though much data calculating, can work out the convert of the static pressure at the bottom of the well is relatively precise. The error of from flowing pressure convert is a little large, mainly owe to the influence of the size of gas and water.