本文選題：雙水平井完井 + 穩(wěn)態(tài)耦合　； 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：水平井開發(fā)底水油藏面臨的最大問題就是底水脊進(jìn),底水脊進(jìn)使油井過早見水、產(chǎn)量驟減和含水快速上升,并導(dǎo)致水處理費(fèi)用增加和開發(fā)成本升高。因此底水油藏開發(fā)的關(guān)鍵技術(shù)是抑制底水錐／脊進(jìn)和控制底水均勻驅(qū)替,最大程度的延長油井無水采油期以達(dá)到提高底水油藏開發(fā)效果的目的。為降低含水率的增長速度,恢復(fù)和提高油井產(chǎn)量,開展雙水平井排水采油控制底水錐進(jìn)技術(shù)的研究將從根本上解決底水錐進(jìn),為強(qiáng)底水油藏的高效快速開發(fā)提供新的開發(fā)思路和開發(fā)方法。 本文在調(diào)研大量文獻(xiàn)的基礎(chǔ)上,采用半解析方法對(duì)雙水平井完井產(chǎn)能預(yù)測及其影響因素的影響規(guī)律進(jìn)行研究。首先,根據(jù)鏡像反映原理和壓降疊加原理,采用點(diǎn)源函數(shù)法建立了底水油藏雙水平井完井的油藏滲流模型；根據(jù)近井筒滲流特征建立了近井筒入流模型；根據(jù)生產(chǎn)段變質(zhì)量流特征建立了井筒壓降模型；考慮油藏各向異性、滲流干擾、井筒管流壓降、鉆完井污染等因素,再將三者關(guān)聯(lián)建立了其產(chǎn)能預(yù)測耦合模型,給出求解方法并編制了相應(yīng)程序。得到底水油藏雙水平井完井方式下,沿上水平井井筒的流率分布和井底流壓分布,并分析了油藏地質(zhì)特征參數(shù)和排采工藝參數(shù)對(duì)雙水平井完井產(chǎn)能的影響。 然后,通過分析水平井底水脊進(jìn)機(jī)理及其二維、三維模型,建立雙水平井完井底水脊進(jìn)的三維模型,求解出雙水平井完井時(shí)的底水突破時(shí)間與水脊突破高度,并分析了不同原油粘度、各向異性、避水高度、采水井位置和生產(chǎn)壓差對(duì)其產(chǎn)生的影響。結(jié)果表明：采油井筒越靠近油層頂部,底水突破時(shí)間越長,且隨著水平井筒向上移動(dòng),底水突破時(shí)間增加得越快；隨著kh/kv比值的增加,底水突破時(shí)間減小。 最后,利用底水油藏雙水平井完井產(chǎn)能模型和三維底水脊進(jìn)模型,以累積無水產(chǎn)油量為目標(biāo)函數(shù),優(yōu)化排采參數(shù),選出最佳控水采油方案。結(jié)果表明：采水井長度需要優(yōu)化,存在最佳長度；采水井在中下部時(shí)采水控油效果較好；采水油比的大小不超過1.5控水效果較好。根據(jù)具體井的參數(shù),對(duì)采水井的長度、位置、采水量進(jìn)行優(yōu)化,列舉了4種不同的完井方案,最終選出了最佳完井方案。 本文的研究成果能為底水油藏對(duì)雙水平井完井技術(shù)的適用性及排采參數(shù)優(yōu)化提供理論基礎(chǔ),指導(dǎo)油田進(jìn)行雙水平井完井設(shè)計(jì)。
[Abstract]:The biggest problem faced by horizontal well in developing bottom water reservoir is the bottom water ridge advance, which makes the oil well see water prematurely, reduce the production and increase water cut rapidly, and lead to the increase of water treatment cost and development cost. Therefore, the key technology of bottom water reservoir development is to restrain the bottom water cone / ridge flow and to control the uniform displacement of bottom water, so as to extend the oil well water production period to the maximum extent in order to improve the development effect of bottom water reservoir. In order to reduce the growth rate of water cut and to restore and improve the production rate of oil wells, the research on the technology of controlling bottom water coning by drainage oil production in double horizontal wells will fundamentally solve the problem of bottom water coning. It provides a new development idea and method for high efficiency and fast development of strong bottom water reservoir. In this paper, based on the investigation of a large number of literatures, the semi-analytical method is used to study the influence law of dual horizontal well completion productivity prediction and its influencing factors. Firstly, according to the principle of mirror reflection and the principle of pressure drop superposition, the reservoir percolation model of double horizontal well completion in bottom water reservoir is established by using point source function method, and the near wellbore inflow model is established according to the percolation characteristics of near wellbore. According to the characteristics of variable mass flow in production section, the wellbore pressure drop model is established, considering the factors of reservoir anisotropy, percolation interference, wellbore pipe flow pressure drop and well drilling and completion pollution, the coupling model of productivity prediction is established. The solution method is given and the corresponding program is worked out. The flow rate distribution and bottom hole flow pressure distribution along the upper horizontal well under the completion mode of dual horizontal wells in bottom water reservoir are obtained. The effects of reservoir geological characteristics and production discharge parameters on completion productivity of double horizontal wells are analyzed. Then, by analyzing the mechanism of bottom water ridge in horizontal well and its two dimensional and three dimensional models, a three dimensional model of double horizontal well completion bottom water ridge is established, and the breakthrough time of bottom water and the height of water ridge breakthrough during completion of double horizontal well are obtained. The effects of viscosity, anisotropy, water diversion height, well location and production pressure on the crude oil were analyzed. The results show that the closer the well bore is to the top of the reservoir, the longer the breakthrough time of bottom water is, and the faster the breakthrough time of bottom water increases with the horizontal wellbore moving upward, and the less the breakthrough time of bottom water decreases with the increase of kh/kv ratio. Finally, by using the dual horizontal well completion productivity model and three dimensional bottom water ridge feeding model in the bottom water reservoir, taking the cumulative waterless oil production as the objective function, the drainage parameters are optimized and the optimal water-controlled oil recovery scheme is selected. The results show that the length of the well needs to be optimized and the optimum length exists; the water production and oil control effect of the well is better when the production well is in the middle and lower part; the ratio of water to oil is less than 1.5 and the water control effect is better. According to the parameters of the wells, the length, location and water yield of the wells are optimized, four different completion schemes are listed, and the optimal completion schemes are selected. The research results in this paper can provide a theoretical basis for the applicability of the bottom water reservoir to the completion technology of double horizontal wells and the optimization of production discharge parameters, and guide the completion design of dual horizontal wells in oil fields.
【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】：2015
【分類號(hào)】：TE257

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