本文關(guān)鍵詞：WS砂礫巖油藏能量補(bǔ)充方式研究　出處：《西南石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 砂礫巖 非均質(zhì)性 eclipse 水驅(qū) 氣驅(qū) 開(kāi)發(fā)方案

【摘要】：WS砂礫巖油藏是一類被斷層割裂開(kāi)的復(fù)雜砂礫巖油藏,儲(chǔ)層物性差,為低孔低滲或中低滲,且儲(chǔ)層具有強(qiáng)非均質(zhì)性。前期探索開(kāi)發(fā)顯示W(wǎng)S油藏具有復(fù)雜的壓力系統(tǒng)和油水分布,初步的注水開(kāi)發(fā)效果不明顯。由于國(guó)內(nèi)外有關(guān)相似油藏的開(kāi)發(fā)均采用注水開(kāi)發(fā)的方式,結(jié)合本油藏的特點(diǎn),本文中,將進(jìn)一步評(píng)價(jià)水驅(qū)開(kāi)發(fā)的適應(yīng)性,并在此基礎(chǔ)上,探索WS砂礫巖油藏氣驅(qū)的適應(yīng)性,為現(xiàn)場(chǎng)注水注氣補(bǔ)充能量方式的選擇提供依據(jù)。為了解決以上問(wèn)題,本文是以實(shí)驗(yàn)研究和數(shù)值模擬研究為主,并結(jié)合油藏工程方法,三者相結(jié)合,研究WS砂礫巖油藏補(bǔ)充能量方式。本文主要展開(kāi)以下工作:(1)基于WS砂礫巖油藏區(qū)塊初期開(kāi)發(fā)的緣故,充分調(diào)研國(guó)內(nèi)外相似砂礫巖油藏已經(jīng)趨于成熟的開(kāi)發(fā)方案和經(jīng)驗(yàn),為本油藏的進(jìn)一步投產(chǎn)開(kāi)發(fā)提供充分的現(xiàn)場(chǎng)依據(jù);(2)通過(guò)PVT流體相態(tài)實(shí)驗(yàn)研究原油相態(tài)性質(zhì),并進(jìn)一步運(yùn)用ECLIPSE數(shù)模軟件進(jìn)行相態(tài)擬合;在此基礎(chǔ)上分別模擬CO2、N2和伴生氣注氣膨脹,通過(guò)對(duì)比注入C02、N2和伴生氣對(duì)原油飽和壓力、粘度和原油膨脹系數(shù)的影響程度確定出CO2和伴生氣的增溶效果明顯,能有效的改善原油流動(dòng)性能,為后面的注氣方案選取注入氣體介質(zhì)提供依據(jù);(3)進(jìn)行細(xì)管實(shí)驗(yàn),研究CO2、N2和伴生氣三種注入氣體的最小混相壓力,得出結(jié)論為CO2最小混相壓力小于伴生氣,且均低于原始地層壓力,為研究CO2和伴生氣的混相驅(qū)替機(jī)理提供依據(jù);(4)通過(guò)組合長(zhǎng)巖心驅(qū)替研究比較水驅(qū)、CO2和伴生氣三種不同注入方式的驅(qū)替效率,為選擇注水和注氣的驅(qū)替方式提供實(shí)驗(yàn)依據(jù)。最后,通過(guò)長(zhǎng)巖心驅(qū)替實(shí)驗(yàn)結(jié)果得到,注入CO2在0.60HCPV時(shí)突破,突破時(shí)間最晚,且突破后油水同采期間的采出程度為14.92%,注CO2驅(qū)替最終采出程度為77.37%;注伴生氣在0.43HCPV時(shí)突破,突破后共提采6.41%,最終采出程度為54.31%,由此可得出,注CO2驅(qū)替的效果最好,其次是伴生氣驅(qū)替;(5)以WS油藏9井區(qū)儲(chǔ)層非均質(zhì)特性為基礎(chǔ),通過(guò)ECLIPSE數(shù)模軟件建立起非均質(zhì)性強(qiáng)弱不同的長(zhǎng)巖心數(shù)值模擬,從而評(píng)價(jià)非均質(zhì)性對(duì)驅(qū)替效率的影響;(6)充分運(yùn)用油藏工程的方法,采用經(jīng)驗(yàn)公式和類比法相結(jié)合的方式,初步論證了注水方案的開(kāi)發(fā)技術(shù)政策,確定出初步的開(kāi)發(fā)層系、井網(wǎng)井距以及注水量等,為后面注水方案的設(shè)計(jì)提供依據(jù);(7)基于前面對(duì)氣驅(qū)方式的評(píng)價(jià)研究,優(yōu)選出適合氣驅(qū)的井區(qū),并對(duì)該井區(qū)進(jìn)行注氣開(kāi)發(fā)技術(shù)政策的研究,通過(guò)論證和優(yōu)化井網(wǎng)井距、注氣時(shí)機(jī)、注入方式,對(duì)比注入介質(zhì)、注入壓力和注入量等參數(shù),為最后注氣方案的確定提供依據(jù)。
[Abstract]:WS sand gravel reservoir is a kind of complex sand gravel reservoir separated by fault. Its physical property is poor, which is low porosity, low permeability or low permeability. And the reservoir has strong heterogeneity. Early exploration and development show that WS reservoir has a complex pressure system and oil-water distribution. The initial effect of waterflooding development is not obvious. Because the development of similar reservoirs at home and abroad adopts the way of waterflooding development, combined with the characteristics of this reservoir, the adaptability of waterflooding development will be further evaluated in this paper. On the basis of this, the adaptability of gas drive in WS sand gravel reservoir is explored, which provides the basis for the selection of gas injection and gas injection in situ to supplement the energy, in order to solve the above problems. In this paper, the experimental research and numerical simulation are the main research, and combined with reservoir engineering methods, the three combined. The main work of this paper is as follows: 1) based on the initial development of WS sand and gravel reservoir block. The development plan and experience of similar sandy gravel reservoirs at home and abroad have been fully investigated, which provides sufficient field basis for further production and development of this reservoir. (2) the phase behavior of crude oil is studied by PVT fluid phase experiment, and the phase behavior fitting is carried out by using ECLIPSE software. On this basis, the expansion of CO _ 2N _ 2 and associated gas injection was simulated, and the saturation pressure of crude oil was compared by injection of C _ (02) N _ (2) and associated gas. The influence degree of viscosity and coefficient of expansion of crude oil determines that the solubilization effect of CO2 and associated gas is obvious, which can effectively improve the fluidity of crude oil and provide the basis for selecting the injected gas medium for the later gas injection scheme. The minimum miscible pressure of CO _ 2N _ 2 and associated gas injection gas is studied. It is concluded that the minimum miscibility pressure of CO2 is smaller than that of associated gas and is lower than that of original formation pressure. It provides the basis for studying the miscible displacement mechanism of CO2 and associated gas. 4) the displacement efficiency of three different injection modes of water drive CO _ 2 and associated gas is compared through the study of combined long core flooding, which provides experimental basis for selecting the displacement mode of water injection and gas injection. According to the experimental results of long core displacement, the breakthrough time of injection of CO2 at 0.60 HCPV is the latest, and the recovery degree of oil and water during the same production period after breakthrough is 14.92%. The final recovery degree of CO2 flooding is 77.37; The injection of associated gas broke through at 0.43 HCPV, after the breakthrough, 6.41 was extracted, and the final recovery degree was 54.31. It can be concluded that the effect of injecting CO2 displacement is the best, followed by associated gas displacement. Based on the heterogeneity of reservoir in WS 9 well area, the numerical simulation of long core with different heterogeneity is established by ECLIPSE software. The effect of heterogeneity on displacement efficiency is evaluated. Using reservoir engineering method, adopting experience formula and analogy method, the development technical policy of water injection scheme is preliminarily proved, and the preliminary development layer system is determined. Well spacing and water injection rate provide basis for the design of backwater injection scheme. Based on the previous research on the evaluation of gas drive mode, the well area suitable for gas drive is selected, and the technical policy of gas injection development in this well area is studied. Through the demonstration and optimization of well spacing, gas injection timing and injection mode. The parameters of injection medium, injection pressure and injection rate are compared to provide the basis for the determination of the final gas injection scheme.
【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)】：TE343

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