Research On Retrofit And Optimization Of Gathering And Transportation System In Old Oil Field Considering Rolling Development

With the continuous development of the oilfield,the production and operation of the oilfield also changes.On the one hand,the oilfield enters a period of ultra-high water cut.In this period,the oil production and gas production decrease,but the water production increases significantly,and the gathering and transportation system appears "big horsedrawn carts".On the other hand,oilfields often adopt a rolling development mode,facing the problem that the existing gathering and transportation system does not match the current production status,and at the same time,it is also necessary to build a gathering and transportation system for new blocks.The important way and key technology to solve these two problems is to retrofit the gathering and transportation system.Considering the rolling development demands of oilfields,the retrofit of gathering and transportation systems in this paper is divided into two categories.One is to retrofit the existing gathering and transporting systems in oilfields,that is,retrofit old blocks.The other is to consider the demand of capacity expansion and carry out the collaborative retrofit of old and new blocks under the comprehensive consideration of the retrofit of old blocks and the retrofit of new blocks.In this paper,in the research on retrofit and optimization of old blocks,the objective function is to minimize retrofit investment and operating cost,and a model is established considering constraints such as pipeline connection,station load rate,and hydraulic power.The decision-making results include demolition and merging of stations,station process retrofit,and pipeline retrofit plan.In the research on the collaborative retrofit and optimization of the old and new blocks,the K-means algorithm is first used to search for the optional position of the new station in the continuous space of the new block,and then the optional position is input into the optimization model of the collaborative retrofit of the old and new blocks.The model takes the minimum sum of the old block retrofit investment,the new block construction investment and the station operation cost as the objective function and is established by considering the constraints such as pipeline connection,station load rate and hydraulic power.It can give a new block construction plan that makes full use of the remaining processing capacity of the old block and an old block retrofit plan that considers the new block construction,to realize the coordinated retrofit of the old and new blocks.Finally,the optimization models are verified and analyzed by taking an oilfield as an example.The results show that the old block retrofit optimization model can complete the retrofit of the old block gathering and transportation system and achieve good results.The new and old block collaborative retrofit optimization model can not only complete the retrofit of the old block,but also consider the construction of the new block,which not only reduces the waste of the remaining processing capacity of the old block,but also improves the economic benefits of the construction of the new block.These two kinds of optimization models are helpful for the adjustment and retrofit of the oilfield gathering and transportation system.