凍結孔泥漿置換漿液材料優(yōu)化及漿液流動混合規(guī)律
發(fā)布時間：2019-03-04 14:33
【摘要】：近年來,全深凍結鑿井技術逐漸在富水巖層井筒建設中得到推廣應用,凍結孔的泥漿置換充填工藝得到了發(fā)展,然而,現(xiàn)場施工中依然會出現(xiàn)凍結管無法順利下沉的情況。因此,本文采用室內(nèi)試驗、數(shù)值模擬及物理模型試驗的方法,開展了凍結孔泥漿置換漿液材料優(yōu)化及漿液流動混合規(guī)律的研究。首先,通過室內(nèi)試驗,在原配方的緩凝水泥漿中摻加超細水泥及外加劑的優(yōu)化,開展緩凝水泥漿性能優(yōu)化研究,確定了摻加超細水泥的緩凝水泥漿配方。結果表明:水泥漿中摻加超細水泥對漿液的初始流動性影響不大,但減小了水泥漿的初凝時間。從初始粘度、結石率、初凝時間、析水速率方面比較,水泥漿中超細水泥混摻量宜為20%~40%。在水泥漿中加入緩凝劑與分散劑,超細水泥混摻比例40%的懸浮穩(wěn)定性比混摻比例30%和35%好。加入相同比例的懸浮劑后,混摻比例為40%的水泥漿懸浮穩(wěn)定性明顯高于混摻比例為30%、35%的水泥漿,且緩凝水泥漿的初始流動性良好。新、原配方的緩凝水泥漿分別與泥漿按照不同體積比混合后,混合漿液的表觀粘度值隨著緩凝水泥漿的比例增加,先緩慢增加然后快速減小;新配方與泥漿不同比例混合后的表觀粘度整體都比原配方略大�；旌蠞{液的初凝時間隨著緩凝水泥漿的比例增加,呈先減小后增大的趨勢。針對優(yōu)化后的緩凝水泥漿,獲得其表觀粘度和動切力等流變參數(shù)。其次,通過室內(nèi)試驗,開展隔離液的研究,獲得了適用于凍結孔泥漿置換充填的隔離液材料及其配方。試驗結果表明:黃原膠摻量達到重晶石粉質量的0.45%時,隔離液的懸浮性能和流動性能優(yōu)異。摻加2%的磺化褐煤樹脂,濾失量為55ml,明顯小于木質素磺酸鈉和烷基萘磺酸鈉。確定隔離液密度為1.30 g/cm3的配方組成為:1.77的水+1的重晶石粉+0.45%黃原膠+2%的磺化褐煤樹脂。隔離液與泥漿和緩凝水泥漿的相容性良好,且隔離液的不同密度的懸浮穩(wěn)定性、濾失性能及流變性能良好,能夠滿足施工需要。針對上述隔離液,獲得了稠度系數(shù)和流性指數(shù)等流變參數(shù)。然后,通過數(shù)值模擬,研究了泥漿置換過程的漿液流動混合規(guī)律,獲得了不同條件下混合段高度的變化規(guī)律。結果表明:體積分數(shù)為5%~95%的環(huán)空混合段高度h隨著壓漿流量的增加呈先增加后減小;隨著壁面粗糙度的增加呈先減小后增大;隨著鉆桿內(nèi)徑與孔徑之比的增加呈先增大后減小,然后再增大;隨著漿液塑性粘度和動切力的逐漸增加呈先減小后增大再減小;隨著鉆桿偏心度的增加呈先減小后增大,且h2不斷增大。同時研究了在各種因素最不利條件下所需隔離液的最小體積量。通過正交試驗的極差和方差分析,影響h2的因素主次順序和顯著性順序相同,依次為:鉆桿偏心度壓漿流量鉆桿內(nèi)徑與孔徑之比漿液流變參數(shù)壁面粗糙度;各因素對寬間隙處混合段高度h(5%~95%)的影響顯著性依次為壓漿流量因素鉆桿偏心度因素壁面粗糙度因素漿液流變參數(shù)因素鉆桿內(nèi)徑與孔徑之比因素。最后,通過物理模擬試驗,開展泥漿置換過程的漿液流動混合規(guī)律研究。結果表明:物理試驗得出的混合段高度h隨著流量的增加,h逐漸增大,但增加趨勢減緩。對應模型的數(shù)值模擬結果表明,隨著流量的增加,混合段高度h呈先增大后減小的趨勢,但減小趨勢很小;物理試驗的混合段高度h的結果都比數(shù)值模擬的結果偏大,并分析了可能存在的影響因素。
[Abstract]:In recent years, the deep freezing and sinking technology has been widely used in the well-bore construction of the water-rich rock formation, and the mud replacement and filling process of the freezing hole has been developed. However, the construction of the site still has the condition that the freezing pipe cannot sink smoothly. In this paper, the method of indoor test, numerical simulation and physical model test is used to study the optimization of slurry material and the mixing law of slurry flow. First, through the indoor test, the optimization of the super-fine cement and the admixture in the slow-setting cement paste of the original formulation is carried out, and the performance optimization of the retarding cement slurry is carried out, and the formula of the slow-setting cement slurry with the super-fine cement is determined. The results show that the initial fluidity of the slurry is not affected by the addition of the super-fine cement in the cement paste, but the initial setting time of the cement paste is reduced. Compared with the initial viscosity, the stone rate, the initial setting time and the water extraction rate, the mixed content of the super-fine cement in the cement paste is 20-40%. Adding retarder and dispersant in the cement slurry, and the suspension stability of the super-fine cement mixing proportion of 40% is 30% and 35% better than the mixing ratio. After the same proportion of suspending agent is added, the suspension stability of the cement paste with the proportion of 40% is obviously higher than that of the cement paste with the mixing ratio of 30% and 35%, and the initial fluidity of the slow-setting cement slurry is good. And the apparent viscosity value of the mixed slurry is gradually increased and then rapidly reduced with the increase of the proportion of the slow-setting cement slurry after the slow-setting cement slurry of the original formula is mixed with the slurry according to the different volume ratio, and the overall apparent viscosity of the new formula and the slurry is larger than that of the original formulation. The initial setting time of the mixed slurry is increased with the increase of the proportion of the slow-setting cement slurry. The rheological parameters such as apparent viscosity and dynamic cutting force are obtained for the optimized slow-setting cement slurry. Secondly, through the indoor test, the isolation liquid is studied, and the spacer material and its formula are obtained. The results of the test show that when the content of the xanthan gum reaches 0.45% of the mass of the barite powder, the suspension property and the fluidity of the spacer liquid are excellent. By adding 2% of the sulfonated lignite resin, the filtration loss was 55 ml, which was obviously lower than that of the sodium lignosulfonate and the sodium alkylsulfonate. The formulation consisting of 1.77 of water + 1 barite powder + 0.45% xanthan gum + 2% sulfonated lignite resin was determined to have a density of 1.30 g/ cm3. The isolation liquid has good compatibility with the slurry and the slow-setting cement slurry, and the suspension stability, the filter loss performance and the rheological property of the different density of the spacer liquid are good, and the construction requirement can be met. The rheological parameters such as the consistency coefficient and the fluidity index are obtained for the above-mentioned spacer liquid. Then, through the numerical simulation, the mixing law of the slurry flow in the slurry displacement process is studied, and the variation law of the height of the mixing section under different conditions is obtained. The results show that the volume fraction is 5% ~ 95%, the height h of the annular mixing section increases with the increase of the grouting flow, and then increases with the increase of the surface roughness. With the gradual increase of the plastic viscosity and the dynamic cutting force of the slurry, the increase in the increase of the increase in the increase of the eccentricity of the drill pipe and the increase of h2. At the same time, the minimum volume of the required spacer is studied under the most adverse conditions of various factors. Through the range of the orthogonal test and the variance of variance, the main and secondary order and the significance order of the influence of h2 are the same, in order that the ratio of the inner diameter and the bore diameter of the drilling rod with the eccentric degree of the drill rod is the surface roughness of the rheological parameter of the slurry; The influence of each factor on the height h (5% ~ 95%) of the mixing section at the wide gap is the factor of the factor of the ratio of the inner diameter and the diameter of the pipe to the surface roughness factor of the eccentric degree of the drilling rod of the grouting flow. Finally, through the physical simulation test, the slurry flow mixing law of the mud displacement process is studied. The results show that the height h of the mixing section obtained by the physical experiment is gradually increased with the increase of the flow rate, but the trend is decreased. The numerical simulation results of the corresponding model show that with the increase of the flow, the height h of the mixing section is the tendency to decrease after the first increase, but the trend is small; the result of the height h of the mixing section of the physical test is larger than that of the numerical simulation, and the possible influence factors are also analyzed.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD265.3
本文編號：2434348
[Abstract]:In recent years, the deep freezing and sinking technology has been widely used in the well-bore construction of the water-rich rock formation, and the mud replacement and filling process of the freezing hole has been developed. However, the construction of the site still has the condition that the freezing pipe cannot sink smoothly. In this paper, the method of indoor test, numerical simulation and physical model test is used to study the optimization of slurry material and the mixing law of slurry flow. First, through the indoor test, the optimization of the super-fine cement and the admixture in the slow-setting cement paste of the original formulation is carried out, and the performance optimization of the retarding cement slurry is carried out, and the formula of the slow-setting cement slurry with the super-fine cement is determined. The results show that the initial fluidity of the slurry is not affected by the addition of the super-fine cement in the cement paste, but the initial setting time of the cement paste is reduced. Compared with the initial viscosity, the stone rate, the initial setting time and the water extraction rate, the mixed content of the super-fine cement in the cement paste is 20-40%. Adding retarder and dispersant in the cement slurry, and the suspension stability of the super-fine cement mixing proportion of 40% is 30% and 35% better than the mixing ratio. After the same proportion of suspending agent is added, the suspension stability of the cement paste with the proportion of 40% is obviously higher than that of the cement paste with the mixing ratio of 30% and 35%, and the initial fluidity of the slow-setting cement slurry is good. And the apparent viscosity value of the mixed slurry is gradually increased and then rapidly reduced with the increase of the proportion of the slow-setting cement slurry after the slow-setting cement slurry of the original formula is mixed with the slurry according to the different volume ratio, and the overall apparent viscosity of the new formula and the slurry is larger than that of the original formulation. The initial setting time of the mixed slurry is increased with the increase of the proportion of the slow-setting cement slurry. The rheological parameters such as apparent viscosity and dynamic cutting force are obtained for the optimized slow-setting cement slurry. Secondly, through the indoor test, the isolation liquid is studied, and the spacer material and its formula are obtained. The results of the test show that when the content of the xanthan gum reaches 0.45% of the mass of the barite powder, the suspension property and the fluidity of the spacer liquid are excellent. By adding 2% of the sulfonated lignite resin, the filtration loss was 55 ml, which was obviously lower than that of the sodium lignosulfonate and the sodium alkylsulfonate. The formulation consisting of 1.77 of water + 1 barite powder + 0.45% xanthan gum + 2% sulfonated lignite resin was determined to have a density of 1.30 g/ cm3. The isolation liquid has good compatibility with the slurry and the slow-setting cement slurry, and the suspension stability, the filter loss performance and the rheological property of the different density of the spacer liquid are good, and the construction requirement can be met. The rheological parameters such as the consistency coefficient and the fluidity index are obtained for the above-mentioned spacer liquid. Then, through the numerical simulation, the mixing law of the slurry flow in the slurry displacement process is studied, and the variation law of the height of the mixing section under different conditions is obtained. The results show that the volume fraction is 5% ~ 95%, the height h of the annular mixing section increases with the increase of the grouting flow, and then increases with the increase of the surface roughness. With the gradual increase of the plastic viscosity and the dynamic cutting force of the slurry, the increase in the increase of the increase in the increase of the eccentricity of the drill pipe and the increase of h2. At the same time, the minimum volume of the required spacer is studied under the most adverse conditions of various factors. Through the range of the orthogonal test and the variance of variance, the main and secondary order and the significance order of the influence of h2 are the same, in order that the ratio of the inner diameter and the bore diameter of the drilling rod with the eccentric degree of the drill rod is the surface roughness of the rheological parameter of the slurry; The influence of each factor on the height h (5% ~ 95%) of the mixing section at the wide gap is the factor of the factor of the ratio of the inner diameter and the diameter of the pipe to the surface roughness factor of the eccentric degree of the drilling rod of the grouting flow. Finally, through the physical simulation test, the slurry flow mixing law of the mud displacement process is studied. The results show that the height h of the mixing section obtained by the physical experiment is gradually increased with the increase of the flow rate, but the trend is decreased. The numerical simulation results of the corresponding model show that with the increase of the flow, the height h of the mixing section is the tendency to decrease after the first increase, but the trend is small; the result of the height h of the mixing section of the physical test is larger than that of the numerical simulation, and the possible influence factors are also analyzed.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD265.3
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