The Main Gas Well Of Puguang Gas Field Non-stop Production Well Test And Application

Puguang gas field located in Sichuan Province the Xuanhan territory, the gas field range is low mountain ground altitude of300to900m or so. The structure is located in east Sichuan fault-fold belt northeast section of dual-Stone Temple-a structural nose the Puguang NE trending tectonic belt, between the Daba Mountain nappe leading edge of the fold belt with the Sichuan gentle folds with phase between. Puguang gas field is constructed-and lithologic gas reservoir, the Feixianguan groups-Changxing Formation of proven gas-bearing area45.58km2natural gas geological reserves of2510.7×108m3. The Puguang Tibet deeply buried, and there are high pressure, high temperature, high-sulfur "three high". The reservoir depth of4500-5700m, high pressure coefficient, adequate energy and gas reservoirs, reservoir temperature,118-130℃, the geothermal gradient of2.18℃/100m. The average concentration of methane in natural gas75.86%, hydrogen sulfide, the average content of15.16%, the average carbon dioxide content of8.64%for the high sulfur content, carbon dioxide over mature dry gas natural gas reservoirs.Puguang Gas Field, the main reservoir properties better, to the hole and permeability, high porosity and permeability reservoir-based. According to the the Puguang two well core analysis. Feixianguan group porosity ranged from0.94-28.86%with an average of8.17%, greater than2%of the sample average porosity of8.64%. The porosity is mainly distributed in the6-12%, accounting for42%of the total number of samples;2-6%,>12%of the sample proportion of30%,21%. The penetration for0.0112-3354.6965×10-3μm2, and the average penetration rate of94.4234×10-3μm2.>1.0×10-3μm2dominant, accounting for41%of the total number of samples;0.002-0.25×10-3μm2, accounting for39%of the total number of samples.In recent years, the Puguang gas field in the constructor to explain sedimentary facies, reservoir characteristics and reservoir prediction, including the prediction of gas has carried out extensive research, has also made a number of achievements recognized. Puguang gas field buried deep, high pressure, high-yield, high-sulfur high deep "characteristics, and vertical wells, highly deviated wells, resulting in pre-production wells in the well test evaluation process has the following problems: (1) Downhole pressure testing, first, the existence of "three high and one deep" characteristics, the downhole pressure testing, wireline, which may lead to loss of seal blowout preventer into the well tool corrosion failure, the test wire to play twist, test equipment, only to fall into the phenomenon of; highly deviated wells (representing about2/3development wells), the instrument is difficult to go down, is the dynamic test data affected by the measure, the conventional test method is difficult to pass the information to understand the evaluation of the difficulties caused to the reservoir can not beanalysis.(2) Discounted at the wellhead pressure, Puguang Gas Field, pre-production36wells have wellhead test pressure, the wellhead pressure converted the bottom hole pressure, increases with the yield converted bottomhole pressure increased anomaly converted the bottom of the well, wellhead pressurethe pressure method requires further study.(3) Well test analysis and evaluation, Puguang gas testing for36development wells. The302-2well incinerator burning gas test modified isochronal test; P302-1wells three middle layer and the whole well capacity test under four different systems, a full24hours of the wells pressure buildup test.Puguang Gas Field, the lack of reliable test in the case of Puguang Gas Field, the main gas wells put into operation one after another, in order to master the gas reservoir development of dynamic characteristics, to carry out the the Puguang main gas fields do not stop production (uninterrupted) testing technology is in-depth understanding of the gas reservoir well testingand dynamic parameters, characteristics, further optimization of the gas well production allocation needs to be extended for the realization of the Puguang Gas Field, the stable period, and efficient development and smooth operation lay the foundation.Combination of Puguang Gas Field, the main production building of the progress of research results and dynamic understanding, it will be important to carry out the following aspects:(1) Puguang Gas Field, the main gas well is not discontinued the test method feasibility analysis:conventional well test method in the high sulfur content of the Puguang Gas Field wells difficult economic admission to qualified well test data, the direct impact of the gas reservoir characteristics and capacity analysis and evaluation. The well test method currently in use on the basis of research studies, discontinued testing of new technology to explain from the test equipment, testing ways and means, information on admission, data processing feasibility analysis.(2) The gas well is not discontinued the theoretical study of the well test (test):oil and gas well testing (test) is based on percolation theory is based on a rigorous scientific method, stable output, pressure, and the opening and closing time requirements. Puguang gas field, the special requirements to complete the well testing task in less shut-in conditions to do well, that is not discontinued, which is the conventional test theory does not describe the situation. So to analyze a variety of non-stop production information from the well test method admitted to identify the theoretical basis of non-stop production well testing, study the theory of non-stop production well testing.(3) The gas well is not discontinued the well test method research: Analysis of the geological features of the Puguang gas field, reservoir characteristics, borehole conditions, completion status; analysis of the advantages and disadvantages of various cut-off of the well test method; Puguang Gas Field characteristics and Puguang gas fieldthe specific requirements of the well test, study for non-stop production of the Puguang gas field well test method. Percolation test theory, research the different types of wells is not discontinued the main factors of the well test, the best non-stop production well test method on different types of vertical wells, deviated wells, acid killing and horizontal wells wells(4) Gas well without stopping production well test data interpre—tation method:for non-stop production well test method characteristics and influencing factors of well test data analysis, data quality evaluation. To carry out non-stop production well test data interpretation method on the right do not stop production well testing theory, the use of non-stop production well test interpretation data or results on gas well productivity evaluation, dynamic analysis, and continue to optimize, improve interpretation methods to reach further optimization of the gas well production allocation, for the efficient development of the Puguang gas field, the smooth operation of the foundation.(5) Gas well without stopping production well test tools and admission data adaptive analysis:for the characteristics of high pressure, high-yield, high sulfur content of the Puguang gas field, its scope of application of the test tool and application accuracy has an impact analysis tool adaptability. Uninterrupted long testing process, the storage media exception (error) of the sensitivity test of the data. Analyze the characteristics of mass storage data stability analysis of existing testing tools Performance analysis and study, to improve research on this basis.