連續(xù)氣舉采油設(shè)計方法研究
發(fā)布時間：2018-11-09 07:14
【摘要】：連續(xù)氣舉采油是氣舉采油方式的一種,這種人工舉升方法的原理就是向油套環(huán)空中連續(xù)不斷的注入高壓氣體,氣體與井筒中的流體混合,致使井筒中混合物密度降低,從而導(dǎo)致井底流壓降低,生產(chǎn)壓差增大,將井筒中流體舉升到地面的一種類似于自噴的舉升方法。連續(xù)氣舉采油的適應(yīng)范圍很廣,無論是流體性質(zhì)、產(chǎn)量范圍還是舉升高度,連續(xù)氣舉都有著良好的適應(yīng)性,具有以下技術(shù)特點：(1)產(chǎn)量適應(yīng)范圍廣,在地面可實現(xiàn)產(chǎn)量調(diào)節(jié)；(2)運動部件少,壽命長,能實現(xiàn)三年不動管柱進行生產(chǎn)；(3)氣舉閥通過鋼絲作業(yè)進行更換,檢修方便；(4)相應(yīng)的完井管柱可實現(xiàn)測試、壓井和不壓井作業(yè)；(5)適應(yīng)環(huán)境能力強,不受砂、氣、井斜以及惡劣的地表環(huán)境等因素的影響；(6)操作簡單,生產(chǎn)容易實現(xiàn)集中化和自動化管理,運行成本低。一般,在進行連續(xù)氣舉采油前,需要進行氣舉設(shè)計。而氣舉設(shè)計離不開理論方法的指導(dǎo),因此,對連續(xù)氣舉采油設(shè)計方法研究很有必要。而準(zhǔn)確氣舉設(shè)計方法的研究需獲得如下基本資料：井深、油、套管尺寸、油井生產(chǎn)條件、地面管線尺寸及長度或給定的井口油管壓力,希望獲得的產(chǎn)量、含水、注入氣的相對密度、可提供的注氣壓力及氣量、油井流入動態(tài)、油井溫度、地面流動溫度、地面原油密度、地層水密度、壓井液密度、天然氣的相對密度、地層靜壓、生產(chǎn)氣油比和原油粘度等。上述各項資料中大多數(shù)將直接用于設(shè)計,個別項作為設(shè)計時參考使用。因此,氣舉設(shè)計方法是氣舉技術(shù)的關(guān)鍵內(nèi)容,選擇合適的設(shè)計方法,可使氣舉井以較佳的狀態(tài)工作,實現(xiàn)氣舉井的產(chǎn)量最優(yōu)化。本文研究了連續(xù)氣舉采油設(shè)計方法中最常用三種方法：可變流壓梯度法、等注氣壓力降氣舉設(shè)計法和等關(guān)閉壓力降氣舉設(shè)計法,并對這三種方法進行對比分析,然后用以等關(guān)閉壓力降氣舉設(shè)計法為理論基礎(chǔ)的PIPESIM來對Y油田的B地層進行氣舉方案設(shè)計。通過理論來指導(dǎo)實踐,用實踐來深化理論,使油井以最大產(chǎn)能生產(chǎn)。首先,對連續(xù)氣舉采油設(shè)計國內(nèi)外現(xiàn)狀進行調(diào)研；其次,研究最常用的三種氣舉設(shè)計方法,給出了這三種方法的設(shè)計過程以及適用條件等；然后,用等關(guān)閉壓力降法對區(qū)塊的油井進行氣舉設(shè)計。先對人工氣舉舉升接替時機進行預(yù)測,在此基礎(chǔ)上對注氣壓力進行優(yōu)選以及對注氣量進行預(yù)測,得出氣舉設(shè)計結(jié)果如布閥級數(shù)和布閥深度等。最后,進行氣舉優(yōu)化配氣,而氣舉動態(tài)曲線是優(yōu)化配氣的基礎(chǔ),對注氣壓力和井口壓力進行敏感性分析,可以優(yōu)化氣舉設(shè)計,最終提高產(chǎn)量和節(jié)約經(jīng)濟成本。
[Abstract]:Continuous gas lift oil production is one of the gas lift oil production methods. The principle of this artificial lifting method is to continuously inject high pressure gas into the oil ring air, and the gas is mixed with the fluid in the wellbore, resulting in the decrease of the density of the mixture in the wellbore. As a result, the bottom hole flow pressure is reduced, the production pressure difference is increased, and the fluid in the wellbore is lifted to the ground, which is similar to the self-blowout lifting method. Continuous gas lift oil recovery has a wide range of adaptation, whether fluid properties, production range or lift height, continuous gas lift has a good adaptability, with the following technical characteristics: (1) wide range of production adaptation, Yield regulation can be realized on the ground; (2) few moving parts and long life, which can realize the production of three years fixed pipe string; (3) the gas lift valve can be replaced by steel wire operation, and the maintenance is convenient; (4) the corresponding completion string can be used for testing, well killing and no well killing; (5) it has strong adaptability to the environment and is not affected by sand, gas, well inclination and bad surface environment. (6) it is easy to operate easily and realize centralized and automatic management, and the operation cost is low. In general, gas lift design is needed before continuous gas lift production. Gas lift design can not be separated from the guidance of theoretical methods, so it is necessary to study the design method of continuous gas lift oil production. And the research of accurate gas lift design method needs to obtain the following basic data: well depth, oil, casing size, production conditions, surface pipeline size and length or given wellhead tubing pressure, desired production rate, water cut, The relative density of the injected gas, the gas injection pressure and volume, the inflow performance of the oil well, the temperature of the well, the surface flow temperature, the density of crude oil on the ground, the density of formation water, the density of the fluid, the relative density of natural gas, the static pressure of the formation, The ratio of gas to oil and the viscosity of crude oil are produced. Most of the above information will be used directly for design, and individual items will be used as reference at design time. Therefore, the gas lift design method is the key content of the gas lift technology. Choosing the appropriate design method can make the gas lift well work in a better state and realize the optimization of the gas lift well output. In this paper, the three most commonly used design methods for continuous gas lift production are studied: variable flow pressure gradient method, equal injection pressure drop gas lift design method and equal off pressure drop gas lift design method, and the three methods are compared and analyzed. Then PIPESIM is used to design the gas lift scheme of B formation in Y oilfield based on the equal closing pressure drop gas lift design method. Through theory to guide practice, with practice to deepen the theory, so that oil wells to maximize production capacity. Firstly, the current situation of continuous gas lift oil recovery design at home and abroad is investigated. Secondly, the three most commonly used gas lift design methods are studied, and the design process and applicable conditions of these three methods are given. Then, the gas lift design of the oil well in the block is carried out by the equal closing pressure drop method. Based on the prediction of the replacement time of artificial gas lift, the optimal selection of gas injection pressure and the prediction of gas injection volume are carried out, and the gas lift design results such as valve distribution series and valve distribution depth are obtained. Finally, the gas lift optimization of gas distribution, and the gas lift dynamic curve is the basis of the optimization of gas distribution, gas injection pressure and wellhead pressure sensitivity analysis, can optimize the design of gas lift, and ultimately improve the output and save economic costs.
【學(xué)位授予單位】：長江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE355.3
本文編號：2319719
[Abstract]:Continuous gas lift oil production is one of the gas lift oil production methods. The principle of this artificial lifting method is to continuously inject high pressure gas into the oil ring air, and the gas is mixed with the fluid in the wellbore, resulting in the decrease of the density of the mixture in the wellbore. As a result, the bottom hole flow pressure is reduced, the production pressure difference is increased, and the fluid in the wellbore is lifted to the ground, which is similar to the self-blowout lifting method. Continuous gas lift oil recovery has a wide range of adaptation, whether fluid properties, production range or lift height, continuous gas lift has a good adaptability, with the following technical characteristics: (1) wide range of production adaptation, Yield regulation can be realized on the ground; (2) few moving parts and long life, which can realize the production of three years fixed pipe string; (3) the gas lift valve can be replaced by steel wire operation, and the maintenance is convenient; (4) the corresponding completion string can be used for testing, well killing and no well killing; (5) it has strong adaptability to the environment and is not affected by sand, gas, well inclination and bad surface environment. (6) it is easy to operate easily and realize centralized and automatic management, and the operation cost is low. In general, gas lift design is needed before continuous gas lift production. Gas lift design can not be separated from the guidance of theoretical methods, so it is necessary to study the design method of continuous gas lift oil production. And the research of accurate gas lift design method needs to obtain the following basic data: well depth, oil, casing size, production conditions, surface pipeline size and length or given wellhead tubing pressure, desired production rate, water cut, The relative density of the injected gas, the gas injection pressure and volume, the inflow performance of the oil well, the temperature of the well, the surface flow temperature, the density of crude oil on the ground, the density of formation water, the density of the fluid, the relative density of natural gas, the static pressure of the formation, The ratio of gas to oil and the viscosity of crude oil are produced. Most of the above information will be used directly for design, and individual items will be used as reference at design time. Therefore, the gas lift design method is the key content of the gas lift technology. Choosing the appropriate design method can make the gas lift well work in a better state and realize the optimization of the gas lift well output. In this paper, the three most commonly used design methods for continuous gas lift production are studied: variable flow pressure gradient method, equal injection pressure drop gas lift design method and equal off pressure drop gas lift design method, and the three methods are compared and analyzed. Then PIPESIM is used to design the gas lift scheme of B formation in Y oilfield based on the equal closing pressure drop gas lift design method. Through theory to guide practice, with practice to deepen the theory, so that oil wells to maximize production capacity. Firstly, the current situation of continuous gas lift oil recovery design at home and abroad is investigated. Secondly, the three most commonly used gas lift design methods are studied, and the design process and applicable conditions of these three methods are given. Then, the gas lift design of the oil well in the block is carried out by the equal closing pressure drop method. Based on the prediction of the replacement time of artificial gas lift, the optimal selection of gas injection pressure and the prediction of gas injection volume are carried out, and the gas lift design results such as valve distribution series and valve distribution depth are obtained. Finally, the gas lift optimization of gas distribution, and the gas lift dynamic curve is the basis of the optimization of gas distribution, gas injection pressure and wellhead pressure sensitivity analysis, can optimize the design of gas lift, and ultimately improve the output and save economic costs.
【學(xué)位授予單位】：長江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE355.3
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