【摘要】：國內(nèi)外專家學(xué)者對低滲透致密氣藏的開發(fā)日益關(guān)注。低滲透致密氣藏儲量巨大,開發(fā)潛力高,但是由于單井自然產(chǎn)能低,常采用水平井分段壓裂技術(shù)對其進(jìn)行增產(chǎn)改造,壓裂后產(chǎn)能評價對正確評估和分析其壓裂效果十分重要。本文對致密氣壓裂水平井產(chǎn)能評價理論模型與方法進(jìn)行了深入研究,完成了以下主要工作：(1)充分調(diào)研分析了國內(nèi)外試井分析方法、產(chǎn)能評價方法、水平井分段壓裂技術(shù)和水平井裂縫特征及滲流機(jī)理等相關(guān)技術(shù)現(xiàn)狀。(2)利用雙重介質(zhì)氣藏滲流理論,以油層滲流力學(xué)和油藏工程為理論依據(jù),基于Warren—Root模型,推導(dǎo)出了考慮井筒儲集效應(yīng)、表皮效應(yīng)以及天然裂縫影響的無限導(dǎo)流上下邊界封閉側(cè)向無限大分段壓裂水平氣井的現(xiàn)代試井模型。(3)采用Laplace變換將滲流微分方程轉(zhuǎn)換到拉氏空間、運(yùn)用Stehfest數(shù)值反演到實(shí)空間、利用點(diǎn)源法解決壓裂縫的疊加、結(jié)合Duhamel原理考慮表皮效應(yīng)和井筒儲集效應(yīng),并應(yīng)用Matlab編制程序計算求解了無限導(dǎo)流上下邊界封閉側(cè)向無限大分段壓裂水平氣井的現(xiàn)代試井模型。(4)基于壓力響應(yīng)求解了致密氣藏水平井壓裂后的采氣指數(shù),利用Orgin制圖軟件繪制了井底無因次壓力、無因次壓力導(dǎo)數(shù)雙對數(shù)典型圖版以及采氣指數(shù)樣版曲線,總結(jié)了壓力響應(yīng)特征,并對比分析了敏感性因素。(5)結(jié)合壓力響應(yīng)和采氣指數(shù)圖版,優(yōu)化了地層參數(shù)以及裂縫參數(shù),以此建立了一種致密氣藏壓裂水平井產(chǎn)能評價新方法。
[Abstract]:Experts and scholars at home and abroad are paying more and more attention to the development of low permeability tight gas reservoirs. The low permeability tight gas reservoir has huge reserves and high development potential, but due to the low natural productivity of single well, the horizontal well fracturing technology is often used to increase production and reconstruct it. The evaluation of productivity after fracturing is very important to correctly evaluate and analyze the fracturing effect. In this paper, the theoretical model and method of productivity evaluation for tight pressure split horizontal wells are studied in depth. The main works are as follows: (1) well test analysis methods and productivity evaluation methods at home and abroad are fully investigated and analyzed. Horizontal well fracturing technology, fracture characteristics and percolation mechanism of horizontal wells, etc. (2) based on the theory of reservoir percolation mechanics and reservoir engineering, based on Warren-Root model, the theory of dual medium gas reservoir percolation is used. A modern well test model for horizontal gas wells with infinite conductivity upper and lower boundaries closed and infinite segmental fracturing is derived considering wellbore reservoir effect, skin effect and natural fracture effect. (3) the differential equation of seepage flow is transformed into Lagrangian space by Laplace transform. Using Stehfest numerical inversion to real space, using point source method to solve the superposition of compressive fracture, considering skin effect and wellbore reservoir effect combined with Duhamel principle, The modern well test model for horizontal gas wells with infinite conductivity and upper and lower boundaries is calculated by using Matlab program. (4) based on the pressure response, the gas recovery index of fractured horizontal wells in dense gas reservoirs is calculated. The curves of dimensionless pressure, dimensionless pressure derivative, double logarithm of dimensionless pressure derivative and gas recovery index were drawn by using Orgin software, and the pressure response characteristics were summarized. The sensitivity factors are compared and analyzed. (5) combined with pressure response and gas recovery index chart, the formation parameters and fracture parameters are optimized, and a new method for evaluating the productivity of fractured horizontal wells in tight gas reservoirs is established.
【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】：TE328

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