水基泡沫鉆井液穩(wěn)定性影響因素分析
[Abstract]:As a main type of underbalanced drilling fluid, foam drilling fluid has many advantages, such as fast drilling speed, small formation damage, strong suspension energy, effective protection of drilling tools and drill bits, etc. The most important thing to evaluate foam drilling fluid is foaming performance and foaming stability. At present, many scholars have studied the stability of foam, but generally it is the mathematical equation analysis of a single liquid drain or a single gas diffusion, less systematic analysis of both, in order to solve this problem, In this paper, the factors affecting the stability of water-based foam and its performance evaluation are analyzed in macro and micro aspects, and the mathematical equations of foam efflux and gas diffusion coefficient are also analyzed. The main work of this paper is as follows: firstly, the foaming performance and foaming stability of eight kinds of foaming agents are evaluated. The foaming agent YLB, with a foaming height of 780mL and a half-life of 605s was selected and microscopically compared with the foaming agent YLB and foaming agent K12 by means of styroscope and Nano Measure 1.2 software. The results show that the particle size distribution of foaming agent K12 is 56.49 ~ 540.35 渭 m, the average particle size is 246.94 渭 m, and the particle size distribution of foaming agent YLB is 29.38 ~ 260.72 渭 m and 86.29 渭 m respectively. The microcosmic analysis shows that the stability of foaming agent YLB is good. Secondly, the stability of foaming agent YLB foam was investigated in laboratory under different influence factors, such as concentration, temperature, base viscosity, inorganic salt content and pH value. At the same time, the particle size of foaming agent YLB and foaming agent K12 was measured with Scion Image software at different concentration, temperature, time and PH value. The stability of foaming agent was analyzed microscopically under different influence factors. At last, the relationship between the amount of efflux and time is obtained by the mathematical fitting of the quantity of efflux of different types of foaming agent with time. The change of liquid content and particle size with time in the upper and lower layer foam of foaming agent YLB was fitted by using the model proposed by K Feitosa. The results showed that the Deff of upper foams varied with time from 0.96 to 0.93 脳 10-6cm2/s. The Deff of the lower foams varies from 0.81 to 0.93 脳 10-6cm2/s, while the Deff of the upper and lower foams varies little with time and is basically a constant. It is proved that it is better to fit the efflux of foam with the size of foam. At the same time, according to Lemlich theory, the calculation method of gas diffusion coefficient is given, and the gas diffusion coefficient of foaming agent YLB and foaming agent K12 are calculated respectively, and the JYLBJK12. is obtained. It is also proved that the compound foaming agent YLB is more stable than the single blowing agent K 12.
【學(xué)位授予單位】:西南石油大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TE254
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