Straight Line Parallel Flow Development Model Mechanism

With the rapid development of the world economy in the world energy especially increasing demand for petroleum. And in recent decades of oil field and found less and less. Therefore, in the current oil prices, domestic oil shortage, a large number of dependence on imported background, improve oilfield oil recovery increasingly become the oil business part of the business plan. And the water injection development in China reservoir of the ultimate recovery usually only the original geological reserves of20%～40%, after polymer flooding, and surfactant flooding and tertiary oil recovery, the recovery is at most only increased5%～8%and development effect is not ideal. The shortage of recoverable reserves which has been identified is the dominant factor which influence Chinese increasing oil production. The new recoverable reserves is not enough from1985.The recoverable reserves of new oilfield is only forty percent.It is very disadvantage to the development of Chinese petroleum industry if we can not alter condition of shortage of recoverable reserves because the oil production ratio of residual recoverable reserves has been eight percent. Additional reserves to significantly increase in the circumstances, we only through to enhance oil recovery method to solve the financial difficulty.Because nowadays to enhance oil recovery method are many, but the cost of each method are huge and to improve oil recovery rate is not large, so the low cost greatly enhance oil recovery method is a very urgent need to think to explore major issue.We all know that, although the oil industry development has more than one hundred years, but so far only a reservoir development mode, is the traditional radial flow development mode. In this development mode, well into the production Wells with the shortest distance between a wire potential gradient is the largest, injection water along the straight line will happen dash, flooding into the middle finger for process is serious, water flooding affected coefficient is low. After the water flooding leave plenty of residual oil, and the ultimate recovery is low, it is always a radial flow development mode of one of the biggest drawbacks. Crude oil accumulation of oil when the water displacement process, no matter in what way into the oil reservoir, because be flooding in water for most can always keep continuous distribution state, and with the export DuanXiang connected, so the water displacement efficiency higher oil, this is what the original oil saturation higher important reasons. We will oil-water each other and and entry level division or export the connected or not called oil-water contact relation. The traditional radial flow development model it is because of the inevitable refers to the phenomenon and into crude oil is serious segmentation and space, and the production Wells with not connected, so when water breakthrough of water flooded area is less than that of the control well network area, in injection Wells and injection Wells, between production and production and injected water division between was surrounded by the death of large area in the left oil region, the death of the oil region in the form of remaining oil buried in the ground, the water drive process is very low. For process on the displacement, flooding and drive for fluid for fluid between both each other in order to reduce segmentation is an important guarantee to enhance oil recovery. If you want to improve oil recovery, will be in the development process as crude oil to maintain continuity, and with the outlet (production Wells) keep connected.The horizontal well with the development of technology, the application scope of horizontal Wells are also increasingly wide, from the first level production Wells to the current level of injection Wells, production level, the horizontal well in the role of oilfield development increases day by day, and the horizontal well study also become reservoir engineering field of a popular topic. Both at home and from abroad to see, although there has been a large number of papers published about the horizontal well, but with the horizontal well water injection related papers are few. Although the horizontal well water injection technology is not yet, but horizontal well with low pressure water injection water injection, injection quantity, can produce rich hot crack etc. Characteristics. The horizontal well water injection technology is the future oil field development is a very promising technology, therefore, further research level of water injection well percolation theory can not only for horizontal well overall development plan designed to provide certain theoretical basis, to a certain extent can push the horizontal well water injection technology unceasing development and perfect.Level well water flooding the advantages of oil production is:and vertical Wells than see, horizontal Wells of water injection pressure drop won’t focus in one respect, but scattered over the longer oil discharge section, and the pressure drop is small, oil and water interface deformation is small, so not make refers to into the phenomenon. So, the horizontal well water injection technology can greatly improve oil low permeable oilfield development effect, can improve the efficiency of water injection, increase the water flooding affected coefficient and recovery degree, and further improve reservoir pressure remains level, and greatly improve the recovery of crude oil, and good economic benefit is obtained.In the vertical Wells is peer-to-peer production, pressure gradient between two points of the biggest potential function, easy to form refers to come in. In the oilfield began to cloth the well, not dozen vertical and horizontal well call directly, can put the original plane radial flow adjustment parallel flow into a straight line, the horizontal well perforation is the direction of the vertical Oil and gas shot.When the water is horizontal well production form advancing, oil is also the form to the exit, greatly reducing the refers to the phenomenon into, continuity of water flooding the oil for continuity, is flooding in oil for the keep continuity, oil and water in a orderly, and there are rules interface, very little is divided, oil and outlet is connected, and with the outlet is zero distance, so have a good contact state of oil and water. Because of the horizontal pressure gradient as everywhere, greatly improving the spread coefficient and wash the oil efficiency, so as to increase the oil recovery. From this we put forward to realize the parallel horizontal line with the flow of ideas.This paper through the straight line parallel flow simulation displacement experiment, to all sorts of experiment data again and again comparison, sorting and analyzing, exploration and development mode of parallel flow rich straight to enhance oil recovery mechanism and theory, and to realize the parallel flow straight development mode need drilling and oil production technology and feasible in economy fully investigated. This article through the laboratory flat model a lot of experiments, discusses the realization of parallel flow straight way, conditions for process and flooding. By changing the flow velocity, fluid viscosity and related factors to realize the parallel straight they explore the influence of flow process.The ultimate research results of this paper as follows:(一)Research from flooding mechanism to explore the theoretical basis of the straight line parallel flow.(二)In the laboratory using in horizontal well-the mining of horizontal well note straight parallel flow validation way in what way promote.(三)Through the experimental results for single well process and flooding the height of the control are analyzed and change the velocity, fluid viscosity under the influence of factors such as the change of control height.(四)A(?)nalysis examines the straight line parallel flow development mode realized the technical feasibility and economic feasibility.