渤南5區(qū)低滲透油田應(yīng)力場(chǎng)特征及影響因素研究
發(fā)布時(shí)間：2019-04-26 21:09
【摘要】：渤南低滲透油田位于渤南油田東南部,經(jīng)過(guò)多年開發(fā),油藏平面、層間矛盾突顯,嚴(yán)重影響后期開發(fā)。為了進(jìn)一步挖潛,需要對(duì)油層壓裂改造和井網(wǎng)調(diào)整。開展油田應(yīng)力場(chǎng)分布特征及變化規(guī)律研究,對(duì)于指導(dǎo)油井壓裂改造與井網(wǎng)部署調(diào)整具有重要意義。本文通過(guò)對(duì)渤南5區(qū)低滲透油田應(yīng)力場(chǎng)特征及影響因素研究,取得了以下成果及認(rèn)識(shí)。利用Maurice A.Biot所創(chuàng)立的線性孔隙彈性理論作為數(shù)值模擬的理論框架,建立了渤南5區(qū)應(yīng)力場(chǎng)地質(zhì)模型和數(shù)學(xué)模型,編制了應(yīng)力場(chǎng)模擬的輔助分析FISH文檔。模擬了渤南5區(qū)Y5-21井區(qū)和Y65-1井區(qū)應(yīng)力場(chǎng)分布特征,在Y5-21井區(qū),隨著注采強(qiáng)度的減弱,動(dòng)態(tài)生產(chǎn)對(duì)地應(yīng)力的擾動(dòng)效應(yīng)也相應(yīng)減弱。在發(fā)生轉(zhuǎn)注以后,轉(zhuǎn)注井周圍地應(yīng)力影響效應(yīng)發(fā)生反轉(zhuǎn),其影響范圍主要局限于轉(zhuǎn)注井周圍井距大小范圍內(nèi)。而hσ大小分布與砂泥巖界限有較強(qiáng)的相關(guān)性,泥巖層內(nèi)的hσ值變化很小。在Y65-1井區(qū),注采強(qiáng)度越大,hσ值變化范圍越大,hσ偏轉(zhuǎn)量也最大。在注水井關(guān)井階段,hσ絕對(duì)值相對(duì)于初始絕對(duì)值減小。整體上Y65-1井組區(qū)在開發(fā)過(guò)程中水平方向上最小主應(yīng)力hσ偏轉(zhuǎn)量較小。研究了模型靜態(tài)參數(shù)對(duì)地應(yīng)力影響,楊氏模量對(duì)水平方向上主應(yīng)力的方向偏轉(zhuǎn)會(huì)產(chǎn)生較微小的影響,巖石泊松比對(duì)水平方向上應(yīng)力方向偏轉(zhuǎn)量幾乎不存在影響。而Biot系數(shù)對(duì)水平方向上最大、最小主應(yīng)力值和方向偏轉(zhuǎn)量的影響較其它模型參數(shù)大。研究了生產(chǎn)動(dòng)態(tài)因素對(duì)地應(yīng)力的影響,對(duì)于單井采注,隨著采油井井底流壓的降低(開采產(chǎn)量的加大),不同模型相同位置上的hσ絕對(duì)值呈減小趨勢(shì),不同模型相同位置上hσ偏轉(zhuǎn)量呈增大趨勢(shì);當(dāng)注水井注水壓力的提高或注水量的增加時(shí),水平方向的主應(yīng)力絕對(duì)值隨之增加。而多井注采將導(dǎo)致模型某些區(qū)域hσ偏轉(zhuǎn)量增大。探討了井網(wǎng)分布形式對(duì)地應(yīng)力的影響,對(duì)五點(diǎn)法井網(wǎng),僅在注采強(qiáng)度變化的情況下,整個(gè)地應(yīng)力的擾動(dòng)強(qiáng)度與注采強(qiáng)度呈現(xiàn)正相關(guān)。相同生產(chǎn)條件下,五點(diǎn)法井網(wǎng)注采時(shí),hσ最大偏轉(zhuǎn)量小于與一注兩采同等壓差條件下hσ的變化量;這說(shuō)明hσ的偏轉(zhuǎn)并不是采油井、注水井影響效果的簡(jiǎn)單疊加。
[Abstract]:Bonan low permeability oil field is located in the southeast of Bonan oilfield. After many years of development, the contradiction between layers and reservoirs is highlighted, which seriously affects the later development. In order to tap the potential further, reservoir fracturing modification and well pattern adjustment are needed. It is of great significance to carry out the research on the distribution and variation of stress field in oil field, which is of great significance to guide the fracturing transformation and the adjustment of well pattern deployment. Based on the study of stress field characteristics and influencing factors of low permeability oilfield in Bonan area 5, the following achievements and understandings have been obtained in this paper. Using the theory of linear porosity elasticity established by Maurice A.Biot as the theoretical framework of numerical simulation, the geological model and mathematical model of stress field in Bonan 5 area are established, and the FISH documents for auxiliary analysis of stress field simulation are compiled. The distribution characteristics of stress field in well Y5-5 and well Y65-1 in Bonan 5 area are simulated. With the decrease of injection-production intensity, the disturbance effect of dynamic production on in-situ stress is also weakened. After injection transfer, the effect of in-situ stress on the reinjection well is reversed, and the influence range is mainly limited to the well spacing around the transfer well. However, there is a strong correlation between the distribution of h 蟽 and the boundary of sand and mudstone, and the change of h 蟽 value in mudstone is very small. In Y65-1 well area, the greater the injection-production strength, the larger the variation range of h 蟽 value and the maximum h 蟽 deflection. In the closing stage of water injection well, the absolute value of h 蟽 decreases relative to the initial absolute value. On the whole, the minimum principal stress h 蟽 deflection in the horizontal direction of Y65 1 well group area is relatively small. The influence of static parameters of the model on the in-situ stress is studied. The Young's modulus has a small effect on the direction deflection of the principal stress in the horizontal direction, and the Poisson's ratio of rock has little effect on the deflection of the stress direction in the horizontal direction. However, the influence of Biot coefficient on the maximum, minimum principal stress and direction deflection in horizontal direction is greater than that in other models. The influence of production performance factors on in-situ stress is studied. For single-well injection, the absolute value of h 蟽 in the same position of different models decreases with the decrease of bottom hole flow pressure (increase of production output). The deflection of h 蟽 at the same position in different models tends to increase. The absolute value of principal stress in horizontal direction increases with the increase of water injection pressure or water injection in injection wells. However, multi-well injection and production will lead to the increase of h 蟽 deflection in some areas of the model. The influence of well pattern distribution on the in-situ stress is discussed. For the five-point well pattern, the disturbance intensity of the in-situ stress is positively correlated with the injection-production intensity only under the condition of the change of injection-production intensity. Under the same production conditions, the maximum deflection of h 蟽 is less than that of h 蟽 under the condition of the same pressure difference between one injection and two production under the same production conditions, which shows that the deflection of h 蟽 is not a simple superposition of the effect of injection wells and injection wells.
【學(xué)位授予單位】：中國(guó)科學(xué)院研究生院(廣州地球化學(xué)研究所)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE31
本文編號(hào)：2466399
[Abstract]:Bonan low permeability oil field is located in the southeast of Bonan oilfield. After many years of development, the contradiction between layers and reservoirs is highlighted, which seriously affects the later development. In order to tap the potential further, reservoir fracturing modification and well pattern adjustment are needed. It is of great significance to carry out the research on the distribution and variation of stress field in oil field, which is of great significance to guide the fracturing transformation and the adjustment of well pattern deployment. Based on the study of stress field characteristics and influencing factors of low permeability oilfield in Bonan area 5, the following achievements and understandings have been obtained in this paper. Using the theory of linear porosity elasticity established by Maurice A.Biot as the theoretical framework of numerical simulation, the geological model and mathematical model of stress field in Bonan 5 area are established, and the FISH documents for auxiliary analysis of stress field simulation are compiled. The distribution characteristics of stress field in well Y5-5 and well Y65-1 in Bonan 5 area are simulated. With the decrease of injection-production intensity, the disturbance effect of dynamic production on in-situ stress is also weakened. After injection transfer, the effect of in-situ stress on the reinjection well is reversed, and the influence range is mainly limited to the well spacing around the transfer well. However, there is a strong correlation between the distribution of h 蟽 and the boundary of sand and mudstone, and the change of h 蟽 value in mudstone is very small. In Y65-1 well area, the greater the injection-production strength, the larger the variation range of h 蟽 value and the maximum h 蟽 deflection. In the closing stage of water injection well, the absolute value of h 蟽 decreases relative to the initial absolute value. On the whole, the minimum principal stress h 蟽 deflection in the horizontal direction of Y65 1 well group area is relatively small. The influence of static parameters of the model on the in-situ stress is studied. The Young's modulus has a small effect on the direction deflection of the principal stress in the horizontal direction, and the Poisson's ratio of rock has little effect on the deflection of the stress direction in the horizontal direction. However, the influence of Biot coefficient on the maximum, minimum principal stress and direction deflection in horizontal direction is greater than that in other models. The influence of production performance factors on in-situ stress is studied. For single-well injection, the absolute value of h 蟽 in the same position of different models decreases with the decrease of bottom hole flow pressure (increase of production output). The deflection of h 蟽 at the same position in different models tends to increase. The absolute value of principal stress in horizontal direction increases with the increase of water injection pressure or water injection in injection wells. However, multi-well injection and production will lead to the increase of h 蟽 deflection in some areas of the model. The influence of well pattern distribution on the in-situ stress is discussed. For the five-point well pattern, the disturbance intensity of the in-situ stress is positively correlated with the injection-production intensity only under the condition of the change of injection-production intensity. Under the same production conditions, the maximum deflection of h 蟽 is less than that of h 蟽 under the condition of the same pressure difference between one injection and two production under the same production conditions, which shows that the deflection of h 蟽 is not a simple superposition of the effect of injection wells and injection wells.
【學(xué)位授予單位】：中國(guó)科學(xué)院研究生院(廣州地球化學(xué)研究所)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE31
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