Realization Of Dynamic Tracking System For Polymer Flooding In Offshore Oilfield

At present, the word active oil is700×10t, including large marine oilfields taking up41%distributing in a few areas. There is no exception in our country, i.e. hydrocarbon resources is quite rich, and we has found all kinds of reserves up to61×108t mainly concentrating in the Bohai Sea, and more than2/3is heavy oil. But most of water flood recovery efficiency factor in Bohai sea oilfield is only18～25%, taking up32%～40%relative to heavy oil recovery in land field. Consequently it is very important to improve oil recovery in offshore heavy oilfield.As one of methods used in heavy oil’s stable production and stimulation, polymer flooding has been used proverbially in onshore field at home and abroad. Obviously, offshore field has some specific characteristics, such as wide spacing, great input and uncertainty in developing offshore field. All of these lead to that polymer flooding of offshore field can not use experiences from onshore field. Then it is important to study various oil displacement mechanism and influential factors of polymer flooding. But in some cases, for example,data systemic integrity is not enough, or if you need time tracking analysis, which can not rely entirely on numerical simulation. It’s more practical to apply the modern reservoir engineering analysis method for the polymer flooding reservoir real-time analysis, evaluation and decision-making. The development of Sui Zhong-36-1、Qing HuangDao-32-6、Lv Da-5-2has entranced into the mid-late period presently, and been existing many problems.Such as well group between injection and imbalance, imperfect the polymer injection District well network, some wells injection and unstable, uneven water absorption profile For those reasons, the importance of profile modification and numerical simulation is increasing in developing heavy oil field expeditiously during mid and high water-cut stage.The offshore oilfield polymer efficient flooding is to analysis the existing mining dynamic data and test data. Combined with geological data, the oilfield development program could be tracking evaluated and adjusted to agree with the current situation of the oil field. At the same time, this system could help to optimize the selection of polymer flooding related development index, assiste offshore oil field formulation of polymer flooding and realize the exploitation of offshore oil field development is cost-effective.In this paper, the dynamic tracking system on offshore oilfield polymer flooding method is achieved.It includs two parts,the first part is to finish datebase.it contains the import and export interface of Access database and Excel data file, better fault tolerance.It could convert data files from the database and excel much more conviently. At the same time, the dynamic data in the database can be screened according to certain rules (such as blocks, well group, time, etc.), and exported to Excel for daily use. Another part is the offshore oilfield polymer flooding methods section.This part includs Including injection of dynamic analysis and evaluation, production analysis and evaluation, the incremental oil and polymer flooding parameters optimization.According to the Data analysis and calculation, the relevant parameters can be determined for polymer flooding.In the part of polymer flooding injection method of dynamic analysis,the evaluation of polymer flooding injection effects, prediction of injection pressure and the polymer injection amount calculation function are achieved,such as Hall derivative curve method, the power-law differential method and polymer injection wells node method. In production of dynamic analysis module, Changes in polymer flooding production, formation pressure prediction, and changes in water cut patterns could be achieved,such as Weng model, Rayleigh model and so on. Incremental oil calculation module includes a net increase of oil and net precipitation method. Polymer flooding parameters optimization module achieves the economic optimum amount of polymer flooding, polymer flooding reasonable solution viscosity and density of the Economic Limit Well. The entire program is written by Visual Basic6.0language,it achieve drawing and more convenient human-computer interaction.It is the first time to implement offshore oil field of polymer flooding method of dynamic tracking system. After the research of polymer flooding injection analysis, production analysis, incremental oil and polymer flooding parameters optimization analysis, a polymer flooding dynamic tracking systems are formed.