本文選題：致密砂巖 + 氣藏��； 參考：《西南石油大學(xué)》2015年碩士論文

【摘要】：致密砂巖氣在天然氣儲量增長和能源供應(yīng)方面發(fā)揮著越來越重要的作用,已成為非常規(guī)天然氣勘探開發(fā)的重點(diǎn)領(lǐng)域。水相滯留誘發(fā)的水相圈閉損害是致密砂巖氣藏最主要的損害類型之一�？陀^評價水相圈閉損害是有效防治水相圈閉損害的基礎(chǔ),而以往水相圈閉損害評價方法在致密砂巖氣藏水相圈閉損害評價中存在針對性不強(qiáng)、所取得的研究成果應(yīng)用受限等問題,亟待開展致密砂巖氣藏水相圈閉損害評價方法研究。 以鄂爾多斯盆地典型致密砂巖為研究對象,基于水相圈閉損害影響因素及過程機(jī)理,總結(jié)了致密砂巖氣藏水相圈閉損害評價的控制因素,包括水相圈閉損害過程的不同作業(yè)形式、物性及孔隙結(jié)構(gòu)、初始含水飽和度、氣體滑脫效應(yīng)和儲層敏感性。 基于所總結(jié)的水相圈閉損害評價的控制因素,分析了致密砂巖氣藏水相圈閉損害評價中存在的問題。致密巖心可溶鹽的清洗、初始含水飽和度的建立、氣體滑脫效應(yīng)的弱化、氣藏壓力的模擬、不同作業(yè)形式下水相圈閉損害過程的模擬及損害評價指標(biāo)的確定均影響水相圈閉損害的客觀評價。 針對以上水相圈閉損害評價中存在的問題,形成了致密砂巖氣藏水相圈閉損害評價方法。采用反復(fù)加壓飽和法對致密巖心洗鹽,采用毛管自吸法建立初始含水飽和度,在巖心出口端施加回壓至界限壓力弱化氣體滑脫效應(yīng),對巖心充氣模擬氣藏壓力,開展過平衡、近平衡和欠平衡條件下的進(jìn)液實驗以及返排實驗?zāi)M不同作業(yè)形式下的水相圈閉損害過程,以滲透率損害率、返排率和進(jìn)液量為水相圈閉損害評價指標(biāo)。 參與了致密砂巖氣藏水相圈閉損害評價儀的研制與調(diào)試。該評價儀具有功能齊全、自動化程度高、操作方便等優(yōu)點(diǎn),可模擬高溫高壓過平衡、近平衡和欠平衡條件下的水相圈閉損害過程,并可對關(guān)鍵參數(shù)如進(jìn)液量和氣相流量實時監(jiān)測,進(jìn)液量的監(jiān)測精度為0.001mL,氣相流量的監(jiān)測精度為0.001mL/min,為致密砂巖氣藏水相圈閉損害評價方法的應(yīng)用提供了設(shè)備基礎(chǔ)。 以致密砂巖氣藏水相圈閉損害評價方法為基礎(chǔ),結(jié)合所研制的評價儀,編制了致密砂巖氣藏水相圈閉損害評價操作規(guī)程。以大牛地氣田致密砂巖儲層為對象,開展了模擬過平衡、近平衡和欠平衡條件下的水相圈閉損害評價實驗19組,驗證了所撰寫的致密砂巖氣藏水相圈閉損害評價操作規(guī)程和所研制的致密砂巖氣藏水相圈閉損害評價儀可用于評價致密砂巖儲層水相圈閉損害,并從微觀含水分布的角度分析了作業(yè)壓差和滲透率對水相圈閉損害的影響機(jī)理。該評價操作規(guī)程可用于致密儲層水相圈閉損害程度的評價、不同作業(yè)環(huán)節(jié)中工作液的優(yōu)選和水相圈閉損害防治措施的效果評價,為致密砂巖氣藏的成功勘探和經(jīng)濟(jì)開發(fā)提供指導(dǎo)。
[Abstract]:Tight sandstone gas plays an increasingly important role in the increase of natural gas reserves and energy supply, and has become a key area of unconventional natural gas exploration and development. Water trap damage induced by water phase retention is one of the main damage types of tight sandstone gas reservoir. Objective evaluation of water phase trap damage is the basis of effective prevention and treatment of water phase trap damage, but the previous evaluation methods of water phase trap damage in tight sandstone gas reservoir have not strong pertinence in the evaluation of water phase trap damage. Due to the limited application of the research results, it is urgent to study the method for evaluating the water phase trap damage in tight sandstone gas reservoirs. Taking typical tight sandstone in Ordos Basin as an object of study, based on the influencing factors and process mechanism of water trap damage, the controlling factors of water facies trap damage evaluation in tight sandstone gas reservoir are summarized. It includes different operation forms, physical properties and pore structure, initial water saturation, gas slippage effect and reservoir sensitivity. Based on the control factors of water trap damage evaluation, the problems existing in the evaluation of water facies trap damage in tight sandstone gas reservoir are analyzed. Cleaning of soluble salt in dense core, establishment of initial water saturation, weakening of gas slippage effect, simulation of gas reservoir pressure, The simulation of water trap damage process and the determination of damage evaluation index in different working forms affect the objective evaluation of water trap damage. In view of the problems existing in the damage evaluation of the above water traps, a method for evaluating the damage of the tight sandstone gas reservoirs is developed. The repeated pressure saturation method is used to wash the salt in the dense core, the initial water saturation is established by using the capillary self-priming method, the back pressure to the limit pressure at the core outlet is applied to weaken the gas slippage effect, and the pressure of the gas-filled simulated gas reservoir is overbalanced. Under the condition of near-equilibrium and under-equilibrium, the water trap damage process was simulated by the liquid feeding experiment and the reflux experiment. The damage evaluation index of the water phase trap was the permeability damage rate, the return discharge rate and the liquid intake rate. Participated in the development and debugging of the water phase trap damage evaluation instrument for tight sandstone gas reservoir. The instrument has the advantages of complete function, high automation, convenient operation, etc. It can simulate the damage process of water phase trap under the conditions of high temperature and high pressure overbalance, near equilibrium and underbalance. It can be used for real-time monitoring of key parameters such as fluid intake and gas flow rate. The monitoring accuracy of the input volume is 0.001mL and the monitoring precision of gas-phase flow is 0.001mL / min, which provides the equipment basis for the application of the method to evaluate the damage of water-phase trap in tight sandstone gas reservoir. Based on the damage evaluation method of water facies trap in tight sandstone gas reservoir and the developed evaluation instrument, the operational rules for evaluating the damage of water facies trap in tight sandstone gas reservoir are worked out. Taking dense sandstone reservoir in Daniudi gas field as an example, 19 groups of water trap damage evaluation experiments were carried out under the conditions of simulating overbalance, near equilibrium and underbalance. It is verified that the operational rules of hydrographic trap damage evaluation for tight sandstone gas reservoir and the developed water phase trap damage evaluation instrument for tight sandstone gas reservoir can be used to evaluate the water phase trap damage in tight sandstone reservoir. The influence mechanism of working pressure difference and permeability on the damage of water phase trap is analyzed from the point of view of microscopic distribution of water cut. The evaluation procedure can be used to evaluate the damage degree of tight reservoir water trap, the optimal selection of working fluid in different operation links and the effect evaluation of water trap damage prevention measures. It provides guidance for successful exploration and economic development of tight sandstone gas reservoir.
【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】：2015
【分類號】：P618.13

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