The Productivity Dynamic Evaluation Of Low-Permeability Sandstone Gas Reservoir

The Penglaizhen formation gas reservoir in Luodai gas field is a normal pressure and low permeability tight reservoir. There are a lot of small layers Inside of it, the extension of monolayer sand is limited, the thickness is thin and it has low gas abundance. The characteristic of reservoir is very complicated. Low permeability, low pressure, low productivity, larger reserves but low deliverability and strong heterogeneity are all its features. Because all of these, how to objectively comment the productivity in Luodai gas field has provided reliable gist, and it is a problem in dire need of being settled in the process of explore this gas reservoir. Aiming at complicated geological characteristic of it, this thesis based on the static state of gas field and combined with dynamic state features, adopted the way linking dynamic and static state to analyze researching area systemically. Due to all of this, the following researching work was developed in this thesis.1. Basing on the geological characteristic of gas reservoir and combining with logging; well testing and core data to analyze and comment layer reservoir.2. Aiming at the present fracturing well, well testing analysis and production decline is separately adopted to evaluate fracturing well after it was carried out.3. Combining with the exploration characteristics of Penglaizhen formation gas reservoir, quantity of dynamic reservoir and recoverable reservoir of part of the well was calculated. Production dynamic and potential of each small layer was analyzed. And using material balance with time equation to calculate recoverable reservoir controlled by single well.4. At last, the thesis predicted the productivity and analyzed its impacting factors.Through the above study and analyse, it indicates that the Penglaizhen formation gas reservoir in Luodai gas field is found still has some potential in developing deploy and establishing productivity. To produce gas, most of the gas reservoir must be taken fracturing measure. Geology and project affect the productivity of gas well. The geological factors are the sedimentary facies, the thickness of gas Layer, porosity and storage coefficient. The project factor is the measure of hydraulic fracturing. How to make pressure stabilization will be the key problem of the long time steady production.