Analysis on the production performance and its influencing factors of No.15 coal seam in the Panhe block

In order to obtain the production dynamic characteristics of No.15 coal seam in the Panhe block, identify the main factors affecting its productivity and achieve the its stable development, this paper takes the coal bed gas test wells of No.15 coal seam as a research object, analyses the production performance of these wells and investigates the water production, gas yield, pulverizes coal production and their influencing factors.The results show that the No.15 coal seam in the Panhe block is characterized by low water production, lack of high gas yield well and high pulverized coal production, the water production and pulverized coal significantly reduce the gas yield; in the integral development phase, the coalbed gas well should take precedence to be arranged in upper bend and high point of structure where gas content should exceed 20 m³/t and areas belong to weaker hydrodynamics; fracturing effect is greatly affected fracturing fluid quantity, especially prepad fluid for producing gaps, prepad fluid quantity synchronously changes with gas yield when prepad fluid quantity ranges from 110 m³ to 210 m³; pressure decay rate, initial control when gas appearance and drainage continuity are main reasons influencing gas yield in the process of drainage gas recovery.