Simulation And Characteristic Analysis Of Injection Strings

At present, water flooding is an essential part of many modern oilfield development plans to achieve steady and high production rate. Water from its sources is injected into the reservoir formation through water flooding pipe network on the surface and the injection string under the surface. The throttles in the injection allocator control the flux injected into the different reservoir formation. Rational design for the structure of injection strings is the precondition of multi-layer injection production. This thesis is mainly about the method of design for the structure of injection strings which are used in water flooding production. Traditional method of design is inefficient with a long design period; moreover, it mainly depends on designers' professional culture and experiences to accomplish the design job, and some necessary quantitative analysis is omitted during the course of design. On the basis of structural characteristic of injection strings and the requirement of production technics, a mathematical model for hydraulics analysis and mechanics-distortion analysis, which is founded by using computer simulation technology and finite element method, is put forward in this thesis. By dint of the mathematical model, the status of injection allocation and structural distortion can be analyzed on injection strings and then the data will be referenced by a rational design project. In addition, an emluator for analysis based on these theories has been developed. It will become an aided tool for the designers to accomplish their jobs. Under the analysis of a design instance of injection strings, veracity and practicability of mathematical model are proved. The software programmed under theories above is visualized and interactive　 besides some other characteristics such as simple operation and friendly interface. Theories researched in this thesis and the development of design-analysis software provides a new method for the structure-design of injection strings. The application of computer simulation technology can improve the level of design in oilfield.