【摘要】：鑒于微泡鉆井液在衰竭油氣藏鉆井中的成功應(yīng)用,通過實(shí)驗(yàn)測(cè)試和數(shù)據(jù)分析研究了微泡鉆井液的流變性及穩(wěn)定性。配制了一種典型的微泡鉆井液,在不同溫度下對(duì)其黏度進(jìn)行測(cè)試,分別采用冪律模型、賓漢塑性模型和Herschel-Bulkley模型對(duì)測(cè)試數(shù)據(jù)進(jìn)行了擬合,發(fā)現(xiàn)Herschel-Bulkley模型更能準(zhǔn)確描述不同溫度下微泡形成前后鉆井液的流變性。根據(jù)Herschel-Bulkley模型擬合結(jié)果,溫度升高會(huì)提高微泡鉆井液的剪切稀釋程度,微泡形成后鉆井液的靜切力和井眼凈化能力提高,且在高溫下微泡鉆井液性能不會(huì)明顯減弱。低剪切速率下微泡鉆井液具有較高的黏度,可以保證良好的孔隙堵塞效果。微泡尺寸增長速率及靜態(tài)析出實(shí)驗(yàn)中液體析出速率可作為評(píng)價(jià)微泡穩(wěn)定性的指標(biāo):微泡尺寸隨時(shí)間增加增長緩慢且壽命較長,靜態(tài)析出實(shí)驗(yàn)中液體析出速率低,說明微泡鉆井液具有良好的穩(wěn)定性。
[Abstract]:In view of the successful application of microbubble drilling fluid in depleted reservoir drilling, the rheological properties and stability of microbubble drilling fluid were studied by experimental test and data analysis. A typical microbubble drilling fluid was prepared and its viscosity was tested at different temperatures. The test data were fitted by power law model, Bingham plastic model and Herschel-Bulkley model, respectively. It is found that the Herschel-Bulkley model can accurately describe the rheology of drilling fluid before and after the formation of microbubbles at different temperatures. According to the results of Herschel-Bulkley model, the shear dilution degree of microbubble drilling fluid is increased with the increase of temperature, and the static shear force and borehole cleaning ability of microbubble drilling fluid are improved after the formation of microbubble, and the performance of microbubble drilling fluid does not weaken obviously at high temperature. The microbubble drilling fluid has high viscosity at low shear rate and can guarantee good pore plugging effect. The growth rate of microbubble size and the liquid precipitation rate in static precipitation experiment can be used as indicators to evaluate the stability of microbubble. The size of microbubble increases slowly and its life is longer with the increase of time, but the liquid precipitation rate is low in static precipitation experiment. It shows that the microbubble drilling fluid has good stability.
【作者單位】： Faculty
【基金】：Pars鉆井液公司的支持
【分類號(hào)】：TE254

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