The Study Of Development Effect And The New Technique Adaptation Of Drainage Gas Recovery In The Tao2Area

Tao2wellblock is located in the south east of Sulige, in the west side of wellblock withSue in the central south adjacent, the work area covers an area of651km2, as of August2012,the wellblock has271production wells, where the number of the exploratory well is2,research horizon is located in1section of Shanxi formation in upper paleozoic erathem andthe Shihezi group of8segments of each small layer under Permain system, the production andefficiency are low, but the number is big, which cause the gas well management is difficult,the production is hard and stable form is not optimistic.This paper is based on the Tao2wellblock of geology, reservoir comprehensive evaluation, wellblock gas well developmentgeneral situation, and keeps the track evaluation of the gas well development effect in thestudied area, so the restricting factors of development effects in the study area is obtained. Onthe basis of this, the adaptability of drainage gas recovery technology in the study area werestudied by eddy current drainage gas recovery, gas lift and production and injection gas liftdrainage gas recovery, electric submersible pump drainage gas recovery, machine pumpingWells drainage gas recovery.Research results of geology shows that Tectonic setting is a rolling western-leaningmonoclinic, braided river island and delta plain distributary channel and is controlled bymultiphase river swing, migration and rhythm more deposits. The more parts of sectionstructure is thick sandstone and glutenite and grit, and that is ultra-low permeability reservoir,with more complex heterogeneous characteristics, containing water is obvious, oil and gasaccumulation and gas water distribution are mainly controlled by sedimentary facies belt,tectonic setting, the ancient river channel sand body distribution, as well as the factors such aschannel flank and fault.Track evaluation of development effect results show that the study area development effect islow mainly because single well controlled reserves is low degree of gas effusion is high,wellblock formation pressure drop rate is too large,resulting in the formation energy shortage,secondly gas well skin effect, crack effect in natural gas, condensate near borehole wall andstart-up pressure have an effect on development effect. Analysis results of the adaptability to drainage gas recovery show that eddy currentdrainage gas recovery need to consider tool down position, the selection of two levels of spiralangle and eddy current tools outside diameter, also suitable for low moisture ratio of oil wells.Gas lift production technology in the field in the process of implementing production effect isobvious, but before the next effusion need bubble row with production; A jet gas lift needenough high-pressure gas source, obvious effects of electric submersible pump but too high,are not appropriate in the study area. Due to the bottom hole temperature and pressure in thestudy area is not suitable for machine suction drainage gas recovery, machine suction drainagegas recovery is not suitable for promotion. So, in comparison, compressed gas lift productionprocess in Tao2application effect is obvious, is suitable for use in the study area promotion,but need bubble row with production after another production.