Study On Dynamic Characteristics Of DK13 Well Area In Daniudi Low Permeability Gas Field

Daniudi gas field is located in the northeast part of Yishan slope Erdos basin. The reservoir property is poor and strong heterogeneity, it is a typical low permeability tight gas reservoir. From the current development situation, the field has a low production per well, the degree of utilization is poor, stable production situation is grim etc. To ensure that the gas reservoir is scientific and reasonable, efficient development, it is necessary to analyze, research and summary the dynamic characteristics of the gas reservoir. The research of this paper deepened the understanding of this gas reservoir, it has important guiding significance for the reasonable mining scheme and efficient development of the target block to determine.This paper studyied on the production characteristics of target well area, calculated and summed up270wells of non resistance flow, mastered single well production.The paper studied on production variation of target well area and classified the gas wells. Using the production data of single well, it analyzed the water production characteristics of gas reservoirs and finded out the key factors to cause the gas well water yield difference. Using Arps analytical method, it analysed production decline law of the gas reservoir, different types of wells and the single well. And analysed the type of decline, decline speed of the whole block Ⅰ, Ⅱ Ⅲ well. The paper used the pressure drop method, the production decline method, elastic two-phase method, flowing material balance method to calculate the single well controlled reserves, analysed single well controlled reserves influence factors and demarcated target block recovery. The main conclusions and understanding are as follows:(1)Wells are most stable3-5years. The well with stable production period long is less. Without decreasing well is Ⅲ well with low production. Most of the wells produced less water. Ⅰ,Ⅱwells with high yield are the main.(2)The main source of water for the target block is formation water, the part of condensate water and liquid. The main factors of gas wells producing water differences are the geological factors, working fluid flowback and drainage gas recovery measures.(3)1, Ⅱ well most entered decline period, while Ⅲ well most are with no decline. Among decline of wells, most of wells are with harmonic decline, decline rate moderate. Ⅰ, Ⅱ well is most of harmonic decline, Ⅲ well is most of the hyperbolic decline. Ⅰ, Ⅱ Ⅲ well are most decreasing medium.(4)Single well dynamic reserve calculated by all kinds of dynamic method is very close. Among them, average single well controlled reserves of Ⅰ, Ⅱ well is higher, however, average single well controlled reserves of the Ⅲ well is lower. And the better single well reservoir, the lower decline in the rate of monthly gas well casing pressure, the less the average daily water production is, the larger single well dynamic reserves iso(5)Considering Daniudi gas reservoir properties and development characteristics, target area recovery is demarcated to53.8%finally.Research results have been applied in the development of DK13well area of Daniudi gas field with low permeability, and received better results.