Research On The Expansion Technology Of Gas Storage In The North Block Of Lamadian Oilfield

The Lamadian underground gas storage was founded in1975,which is first built in our country, thatthe stored and mined layers is part of upper gas cap of Lamadian oil reservoir, which is located in the northblock, designing for summer injecting and winter mining.In recent years, Daqing area in winter gas peak,the oilfield product a serious shortage of dry gas, mainly rely on Lamadian gas storage and gas oilfieldsupply, but the majority of well shut in summer. In order to alleviating the contradiction that well open inwinter, shut in summer, considering increasing the capacity of Lamadian Oilfield gas storage to giving fullplay to the role of gas storage peaking.First the article researched the development situation for Lamadian oilfield gas cap and geologicalcharacteristics. Based on this, the article studied movement rules for oil and gas of the buffer inLamadian fields,identified the reasonable pressure of stable interface of oil and gas. The useof pressure of oil and gas zone, deduced the calculating equations of peaking capacity of gasstorage, combining with the reality of the gas storage, determined peaking capacity after theexpansion of gas storage, meanwhile,studied stability of lid and compartmentlayer,interference factor between wells and other expansion parameters, determined thereasonable well spacinga and number of wells, finally, deployed a comprehensive monitoringsystem for gas cap, conclusions are as follows: first,Lamadian Oilfield is a typical layeredsandstone gas cap, with a unified interface of gas oil and oil water, each set of oil and gasreservoir maintains a reasonable oil gas oil interface and stable gas pressure difference is±0.5MPa; second,after the overall expansion of the north block of gas storage, build a new onein SⅠlayer and SⅡlayer,which shave peaking ability were1.9×108m3and1.1×108m3;third, determineSⅠlayer and SⅡlayer using irregular distributed wells way, well spacing is800m, away from theborder of oil and gas over400m, SⅠlayer gas storage distribute16wells, SⅡlayer gas storagedistribute9wells;forth, totally deploy various types of monitoring wells242.