Well Test Interpretation And Dynamic Analysis Of Panyu 30-1 Gas Field

Panyu30-1gas field is a large gas field located in the Pearl River Mouth Basin of the South China Sea, the efficient development of the field reasonably has important strategic significance. The field that is developed by horizontal wells, belongs to homogeneous sandstone gas reservoir, and has strong edge water and bottom water. In the process of production monitoring, we find that there has been appeared reservoir pressure is higher than expected. Judging from this, this layer may be appeared signs of water intrusion too fast. Therefore, Panyu30-1gas field is in a critical period of development adjustment, to meet the requirements of stable production, it must start with dynamic data, combined with the static parameters, do a comprehensive dynamic analysis, to lay the foundation for the establishment of single-well reasonable working system.This paper, on the basis of a large number of domestic and foreign literature investigation, according to the geological characteristics of the Panyu30-1gas field, by using the well test analysis combined with production dynamic data analysis, integrated using multi-disciplinary theories and methods such as percolation mechanics, gas reservoir engineering, well test analysis, optimization algorithms and so on, mainly researches in the following aspects, and obtaines the corresponding results.(1) Deliverability analysisFormally, gas reservoir horizontal well’s stable deliverability equation and vertical Wells is the same, but the drainage radius and effective well radius is different from vertical Wells. Horizontal well’s deliverability increases along with the increase of formation pressure, horizontal section length, reservoir thickness, reservoir anisotropy, decreases with the increase of eccentricity, skin factor. When we analyze the deliverability, the deliverability test has certain limitations, but the dynamic deliverability analysis has a wider scope.(2) Analysis of the non-stabilized well testAccording to the geological characteristics of Panyu30-1gas field, the analytical modeles of non-stabilized well test for horizontal well are established. Under the condition of outer boundary is infinite, closed, constant pressure, linear fault, I analyze pressure dynamic characteristics and it’s influencing factors when transient testing for the horizontal Wells in homogeneous gas reservoir(3) Analysis of the dynamic reserveFor strong water drive gas reservoir, we must consider the influence of the water when analysis the dynamic reserves. However, the commonly used material balance method and Topaze production data analysis can’t consider water well, does not apply to water drive gas reservoir. For single well reserves of water drive gas reservoir, this paper establishes the material balance in combination with the production history matching method. And for well connected gas reservoir’s reserves, equivalent method is established.