X水驅(qū)氣藏合理采氣速度研究
發(fā)布時間：2018-12-18 19:18
【摘要】：水驅(qū)氣藏儲量在我國已投入開發(fā)氣藏儲量中占一半以上,大多數(shù)非均質(zhì)性強(qiáng)、水體能量大及采氣速度高的水驅(qū)氣藏開發(fā)過程中均存在不同程度的水侵,嚴(yán)重制約氣藏的開采效果。因此必須對水體運(yùn)動規(guī)律進(jìn)行研究,綜合考慮各種因素的影響,確定合理的采氣速度,防止氣藏過早水淹,以保證水驅(qū)氣藏合理高效的開發(fā)。海上X水驅(qū)氣藏各井區(qū)采氣速度合理界限認(rèn)識不清,影響因素不明確,對采收率影響效果認(rèn)識不清晰。為此,本文針對目標(biāo)氣田地質(zhì)特征,開展了國內(nèi)外類似氣藏采氣速度及開發(fā)效果調(diào)研,采用氣藏工程法和數(shù)值模擬法,對目標(biāo)氣田水體運(yùn)動規(guī)律、單井配產(chǎn)極限等影響采收率的主要因素及合理采氣速度進(jìn)行了研究,取得了如下成果：(1)對國內(nèi)外類似水驅(qū)氣藏的調(diào)研結(jié)果表明：類似氣藏平均采氣速度為5%～6%左右,采收率為60%～75%左右；在生產(chǎn)初期,應(yīng)合理控制采氣速度,見水后,應(yīng)及時調(diào)整采氣速度,使氣井保持“三穩(wěn)定”生產(chǎn)。(2)運(yùn)用出水特征分類方法,分析了目標(biāo)氣田產(chǎn)水氣井出水類型。通過對地質(zhì)及生產(chǎn)狀況進(jìn)行分析,認(rèn)為CHX1井區(qū)水侵方向為氣層下部底水水侵,CHX3井區(qū)水侵方向為南、北兩翼邊水水侵。采用多種方法對目標(biāo)氣田水侵強(qiáng)度進(jìn)行了分析,認(rèn)為目標(biāo)氣田為中強(qiáng)彈性水驅(qū)。采用非穩(wěn)態(tài)水侵模型計算出X氣藏CHX1井區(qū)目前水侵量為70.93×104m3,CHX3井區(qū)水侵量為198.22×104m3。(3)對目標(biāo)氣田進(jìn)行氣井目前無阻流量、氣井臨界攜液流量及氣井臨界產(chǎn)量計算后,分析發(fā)現(xiàn)：各井目前配產(chǎn)比例為無阻流量的10%～30%,均較為合理；A10井產(chǎn)量與臨界攜液流量相接近,井底可能有積液,其余井產(chǎn)量均高于臨界攜液流量；各井區(qū)產(chǎn)氣量高于臨界產(chǎn)量的氣井,均已產(chǎn)水；產(chǎn)氣量低于臨界產(chǎn)量的氣井,目前生產(chǎn)穩(wěn)定。(4)對目標(biāo)氣田進(jìn)行剖面模型機(jī)理分析認(rèn)為：采氣速度越大,模型采收率越低；底水模型中氣井避水高度越高,氣井采收率越高；邊水模型打開程度越高,采收率越高。(5)建立目標(biāo)氣田數(shù)值模擬模型,并進(jìn)行歷史擬合,在氣藏合理配產(chǎn)界限基礎(chǔ)上制定多套方案,對比預(yù)測指標(biāo),結(jié)合類似氣藏調(diào)研成果,確定CHX1井區(qū)合理采氣速度為2%,CHX3井區(qū)合理采氣速度應(yīng)調(diào)整為4%。
[Abstract]:The water drive gas reservoir reserves account for more than half of the developed gas reservoirs in China. Most of the water drive gas reservoirs with strong heterogeneity and high water energy and high gas recovery rate have different degrees of water invasion during the development process. The production effect of gas reservoir is seriously restricted. Therefore, it is necessary to study the law of water body movement, consider the influence of various factors synthetically, determine the reasonable gas recovery speed, prevent the gas reservoir from flooding prematurely, so as to ensure the reasonable and efficient development of the water drive gas reservoir. The reasonable limit of gas recovery velocity in each well area of offshore X water drive gas reservoir is not clear, the influencing factors are not clear, and the effect of oil recovery is not clear. In this paper, according to the geological characteristics of the target gas field, the gas recovery rate and the development effect of similar gas reservoirs at home and abroad are investigated, and the moving law of the water body of the target gas field is studied by using the gas reservoir engineering method and numerical simulation method. The main factors affecting oil recovery and reasonable gas recovery rate, such as the limit of single well production, are studied. The results are as follows: (1) the investigation results of similar water-drive gas reservoirs at home and abroad show that the average gas recovery rate of similar gas reservoirs is about 560% and the recovery factor is about 60%; In the early stage of production, the gas recovery rate should be controlled reasonably, and the gas recovery rate should be adjusted in time after water meeting, so that the gas well can keep "three stable" production. (2) by using the method of classification of the effluent characteristics, the type of water produced from the water well produced by the target gas field is analyzed. Based on the analysis of geology and production conditions, it is considered that the direction of water invasion in CHX1 well area is the bottom water invasion of lower gas reservoir, and the direction of water invasion in CHX3 well area is south and north flanks. Several methods are used to analyze the water invasion intensity of the target gas field, and it is considered that the target gas field is medium strong elastic water flooding. By using the unsteady water invasion model, it is found that the current water invasion rate in the CHX1 well area of X gas reservoir is 70.93 脳 104m3HX3 well area, which is 198.22 脳 104m3. (3) after calculating the current unhindered flow rate of the gas well, the critical fluid carrying rate of the gas well and the critical production rate of the gas well. It is found that the proportion of production in each well is 10 / 30 of unobstructed flow at present, which is more reasonable; The production rate of well A10 is close to the critical fluid carrying flow rate, and there may be liquid accumulation at the bottom of the well, while the production of other wells is higher than the critical fluid carrying flow rate, and the gas wells with higher gas production rate than the critical fluid flow rate in each well area have already produced water. The gas production rate is lower than the critical production rate, and the production is stable at present. (4) the model mechanism analysis of the target gas field shows that the higher the gas recovery rate, the lower the model recovery; The higher the water escape height of the gas well in the bottom water model, the higher the recovery rate of the gas well. The higher the opening degree of the edge water model, the higher the recovery efficiency. (5) the numerical simulation model of the target gas field is established, and the historical fitting is carried out, and on the basis of reasonable distribution and production limit of the gas reservoir, several sets of schemes are worked out, and the prediction indexes are compared. Based on the investigation results of similar gas reservoirs, it is determined that the reasonable gas recovery rate in CHX1 well area should be adjusted to 4.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TE377
本文編號：2386371
[Abstract]:The water drive gas reservoir reserves account for more than half of the developed gas reservoirs in China. Most of the water drive gas reservoirs with strong heterogeneity and high water energy and high gas recovery rate have different degrees of water invasion during the development process. The production effect of gas reservoir is seriously restricted. Therefore, it is necessary to study the law of water body movement, consider the influence of various factors synthetically, determine the reasonable gas recovery speed, prevent the gas reservoir from flooding prematurely, so as to ensure the reasonable and efficient development of the water drive gas reservoir. The reasonable limit of gas recovery velocity in each well area of offshore X water drive gas reservoir is not clear, the influencing factors are not clear, and the effect of oil recovery is not clear. In this paper, according to the geological characteristics of the target gas field, the gas recovery rate and the development effect of similar gas reservoirs at home and abroad are investigated, and the moving law of the water body of the target gas field is studied by using the gas reservoir engineering method and numerical simulation method. The main factors affecting oil recovery and reasonable gas recovery rate, such as the limit of single well production, are studied. The results are as follows: (1) the investigation results of similar water-drive gas reservoirs at home and abroad show that the average gas recovery rate of similar gas reservoirs is about 560% and the recovery factor is about 60%; In the early stage of production, the gas recovery rate should be controlled reasonably, and the gas recovery rate should be adjusted in time after water meeting, so that the gas well can keep "three stable" production. (2) by using the method of classification of the effluent characteristics, the type of water produced from the water well produced by the target gas field is analyzed. Based on the analysis of geology and production conditions, it is considered that the direction of water invasion in CHX1 well area is the bottom water invasion of lower gas reservoir, and the direction of water invasion in CHX3 well area is south and north flanks. Several methods are used to analyze the water invasion intensity of the target gas field, and it is considered that the target gas field is medium strong elastic water flooding. By using the unsteady water invasion model, it is found that the current water invasion rate in the CHX1 well area of X gas reservoir is 70.93 脳 104m3HX3 well area, which is 198.22 脳 104m3. (3) after calculating the current unhindered flow rate of the gas well, the critical fluid carrying rate of the gas well and the critical production rate of the gas well. It is found that the proportion of production in each well is 10 / 30 of unobstructed flow at present, which is more reasonable; The production rate of well A10 is close to the critical fluid carrying flow rate, and there may be liquid accumulation at the bottom of the well, while the production of other wells is higher than the critical fluid carrying flow rate, and the gas wells with higher gas production rate than the critical fluid flow rate in each well area have already produced water. The gas production rate is lower than the critical production rate, and the production is stable at present. (4) the model mechanism analysis of the target gas field shows that the higher the gas recovery rate, the lower the model recovery; The higher the water escape height of the gas well in the bottom water model, the higher the recovery rate of the gas well. The higher the opening degree of the edge water model, the higher the recovery efficiency. (5) the numerical simulation model of the target gas field is established, and the historical fitting is carried out, and on the basis of reasonable distribution and production limit of the gas reservoir, several sets of schemes are worked out, and the prediction indexes are compared. Based on the investigation results of similar gas reservoirs, it is determined that the reasonable gas recovery rate in CHX1 well area should be adjusted to 4.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TE377
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