Study On Indole Pore Extended Morphological Model Of Acidic Acid In Carbonate Rock

Carbonate fields occupied in world oil and gas fields in the distribution of its important position. The carbonate reservoirs in general have naturally fractured and cave development, and serious heterogeneity, sewing cave system is the main medium of oil and gas reservoirs, which makes the exploitation of its increased difficulty. In order to better improve recovery, increase their conduct is very important, and acid fracturing technology is becoming a kind of oil and gas exploration, exploitation, and one of the key technologies to increase reserves and stable. In acid fracturing, because the acid flow in the reservoir, the rock will react with excess acid dissolution larger pores or natural fractures will eventually form wormhole.Acid fracturing construction, due to the acid through the cracks in the wall into the matrix or natural fractures, and their reaction, resulting in the loss of a large number of acid leakoff, the effective distance of the acid is reduced, severely restricting the extension of the main fracture, which is a direct result of poor construction or failure of reservoir stimulation effect. So when the acid fracturing during construction, the calculation of the acid leakoff is very important,and which caused the wormhole leakoff is the main part of the acid leakoff,the research so the wormhole leakoff is to crucial.So study the morphological characteristics of wormhole, wormhole leakoff computing model, designed to control acid leakoff method is to increase technical staff has always been of concern for improving the acid fracturing effect is significant. So study and consideration wormhole expansion mechanism of acid fracturing fluid loss calculation model of wormhole appears that there was important.The paper based on the research literature, analysis of the growth mechanism and distribution of wormhole, and summarizes this model of the previous, combined with fractal theory thinking, In this paper, the research literature, based on the analysis of the growth mechanism and distribution of earthworm holes, wormholes extended summarizing the previous model experiments, combined with fractal theory thinking, to establish a wormhole fractal model, studied the wormhole complex branching structure, and the model under the acid leakoff model were calculated to analyze the factors affecting the expansion of the wormhole, and finally compared the presence or absence of an effective role wormhole filter should fail under acid distance. Results of the surface due to the presence Wormhole, making the acid fluid loss is greatly increased, while the effective distance of the role of acid greatly reduced, so that the reservoir stimulation ineffective, studied the wormhole complex branching structure, and calculate the acid leakoff model, analyze the factors affecting the expansion of the wormhole, and finally compared the presence or absence of an effective role wormhole filter should fail under acid distance. The results show that the presence of Wormhole, making the acid fluid loss is greatly increased, and the effective role of acid distances greatly reduced, so that the reservoir stimulation ineffective.This paper studies the extended model and influencing factors of wormhole in acid fracturing construction, the reasonable control of parameters such that the expansion of wormhole is limited, so to increase the reservoir yield.