Hills Oilfield Low Pressure Zone Production Profile Interpretation Method

The Qiuling oil field is located in the west of Tuha basin Taipei sunken Shanshan arc structure. Along with oil field exploration development thorough, the well chamber fluid pressure unceasingly reduces, at present has been lower than the bubble point pressure. With regard to this kind of low pressure productions, the partial natural gases can separate from the oil and the water in the process of production, sequentially forms the oil gas two-phase flow or the oil gas water three-phase flow in the well. On the one hand, after the fluid degasification causes to the respond relation between the turbine revolution speed and apparent velocity of fluid become more and more complex, This bring about difficulty to calculate the apparent velocity in production profile. On the other hand as the three-phase production profile interpretation is universal difficulty. This article is take the Qiuling oil field as the research object, delivered the angle from the conventional production profile interpretation to the Qiuling oil field low pressure productions production profile explanation method research.The paper mainly divide into three parts, the first part mainly introduced how to calculate the low pressure produces layers interpretation parameters, including third chapter and fourth chapter in the paper. In this part, the paper embarks from the production logging elementary theory, combine related mathematics, geological, physical etc elementary knowledge, established the basic parameter calculate models and the hydrocarbon compound attribute models in the case of well chamber fluid pressure lower than bubble point pressure. Simultaneously, analyzed and contrasted the method of calculate apparent velocity of fluid in the well chamber. Through to collected the production profile test materials in the research area. Apply the theory union reality with multi - parametric linear return has fitted between the starting velocity and flux, density, viscosity response relations, at last discussed to the exceptionally starting velocity adjustment method. The second part including the fifth chapter of paper, In this part detail expatiated the method of production profile interpretation. Toward to continuum flow production profile explanation introduced gas-liquid two-phase drift model, oil water two-phase watt model and oil gas water three-phase watt model. After that, discussed the parameter calculate in the model. Regarding to annular production profile interpretation ,in this paper according to the empirical datum which obtained from experiment in vertical well, manufactured the interpretation chart in lowly produced vertical well in the situations of annular wells. At same time researched the question which met in the process of the annular production profile interpretation. The third part mainly is the sixth chapter in the paper. At first ,synthesizes using the geology, oil test, production logging, analysis chemical examination and production performance material, and union the characteristic of Qiuling oil field well chamber fluid pressure is lower than the bubble point pressure, the output is low, high water contains, exhaustively depicted the characteristic of log curves about research area,and union the characteristic of low pressure produce layer test curves to carry on the qualitative explanation of low pressure produce layer production profile. Finally, utilizes established three-phase flows Watt model and annular explanation chart to carry on the quantitative interpretation about test materials of production profile.This article through research of log response in low pressure produce layer production profile, Applie multi-parametric linear return to established the starting velocity and flux, density, viscosity response relations in the situations of three-phase flows. And use this response relations type to adjust the exceptionally starting velocity. Then applicate corresponding mathematics knowledge thoroughly discussed how to calculate various parameters in the oil gas water three-phase flow watt model. Finally unified the scene material quantitative interpretation establishes a set to be suitable for the research area also to have the certain promotion application value the low pressure produce layer production profile explanation method.