Research On The Adaptability Of Unheated Single Pipe Pigging Gathering Technology In Ultra-high Water Cut Stage

Nowadays, most oilfields have entered into the high water-cut stage in our country. Andsome old plants in Daqing oilfield has already accessed into the ultra-high water cut stage, thetotal water cut has reached95%. In the process of gathering, gas and electricity consumptionincreased sharply because of the hot water incorporation. So, the implement of gatheringwithout heat has been one of the mainly measures for lowering energy consumption. The34wells this paper discussed are in the No.1Oil Production Company of Daqing, and the layerseries of development belong to the east broken well pattern reconstruction, layer of PⅠ1,3-7.This layer has been exploited for many years, and the total water cut has reached more than95%. The deep laying of buried duct has been used in these gathering pipelines, combiningthe characteristics with high oil well liquid-producing and tiny radius of oil gathering, it isknown that the water cut crude oil in this block has the condition of pipeline gatheringwithout heat, according to the indoor sheering test. But in the practical operation, it can bedeveloped smoothly by adding the facility of pigging to further protest the gathering withoutheat. Therefore, it will decrease the production cost of crude oil by developing theadaptability of pipeline gathering without heat. Then offer the technical support to realizingthe lowering energy consumption of oilfield ground production.On the basis of the crude oil properties and the analysis of low temperature rheologicalproperty of oil-water emulsion in this block, we developed an indoor simulation test with a setof indoor gathering tester. According to the analysis of low temperature rheological propertytest result and the calculation of temperature drop during the process of gathering,temperature limit of oil return security is worked out under the corresponding workingcondition. And by checking the actual production data in site, the operating parameters of lowtemperature gathering process in the block are received.On the foundation of the indoor simulation experiment, combining with the actualproduction data in site, a field test is developed. The results indicate that wells in this blockhave the feasibility of gathering without heat, and security of oil return can be realized bypigging regularly. This technology can be widely used in some blocks.