發(fā)布時間：2018-05-12 15:33

  本文選題：M氣田 + 出水規(guī)律��； 參考：《西南石油大學》2015年碩士論文

【摘要】：目前國內(nèi)外已探明的大多數(shù)氣藏均屬于不同程度的水驅(qū)氣藏。氣藏水侵會抑制單井產(chǎn)能,增大氣藏廢棄壓力,降低氣藏采收率。本文研究課題依托中石油海外天然氣勘探開發(fā)合作項目,以M氣田主力氣藏(S氣藏和BP氣藏)為研究對象。隨著氣藏開發(fā)規(guī)模的不斷擴大以及氣井開采時間的延長,氣井出水和氣藏水侵逐漸成為制約氣藏整體開發(fā)效果的主要因素。因此,本文圍繞主力氣藏水侵問題,開展了氣藏概況、氣井出水規(guī)律、氣藏水侵機理與氣藏治水對策四個方面的研究,主要完成了以下工作： (1)以主力氣藏的地質(zhì)勘探資料、壓力資料與生產(chǎn)動態(tài)資料為基礎(chǔ),本文從氣藏的地質(zhì)特征,氣層與水層分布特征,氣藏連通性及開發(fā)現(xiàn)狀四個方面進行分析,得出S氣藏為孔隙(洞)型的中—高孔滲的正常溫壓系統(tǒng)的弱邊底水氣藏,具有統(tǒng)一壓力系統(tǒng)；BP氣藏為受構(gòu)造和巖性控制的正常溫度、高壓—超高壓系統(tǒng)的強邊底水氣藏,東部與西部區(qū)塊間井間連通性較差,西部區(qū)塊氣井間連通性較好。 (2)整理分析2009～2014年主力氣藏生產(chǎn)動態(tài)資料,分析得出S氣藏氣井主要產(chǎn)出凝析水,部分老井井底產(chǎn)生積液；BP氣藏投產(chǎn)井均位于西部區(qū)塊且均保持穩(wěn)定生產(chǎn),靠近大斷層的氣井水氣比呈較快上升趨勢而導致出水風險增大,東部區(qū)塊氣井由于嚴重出水而全部停產(chǎn)。氣井出水水源類型主要包括凝析水、層內(nèi)原生可動水、層內(nèi)次生可動水、邊底水以及工作液返排等類型；結(jié)合典型出水井生產(chǎn)動態(tài)曲線以及主力氣藏氣井水氣比變化特征,總結(jié)得出氣井出水特征包含四種類型,即少量出水穩(wěn)產(chǎn)型、少量出水緩慢增高型、中等出水較快增高型與大水量急劇增高型；分析氣井積液形成機理,繼而針對氣藏不同井型(直井與水平井),利用氣井臨界攜液流量模型診斷氣井積液情況,優(yōu)選出李閩模型和Belfroid模型,并根據(jù)李閩模型制定出氣藏直井積液臨界攜液流量診斷圖版。 (3)基于對氣藏儲層滲流規(guī)律與有水氣藏水侵主要影響因素的分析,利用Eclipse數(shù)值模擬軟件建立了氣藏水侵機理模型并開展了影響因素的敏感性分析,研究認為裂縫系統(tǒng)是裂縫—孔隙型氣藏水侵的主要決定因素,水體倍數(shù)是決定氣藏水侵活躍程度的關(guān)鍵,采氣速度是控制水侵的主要手段,水平井水平段長度及其避水高度對氣藏水侵影響也較大；氣藏水侵模式分析認為主要包含三種類型,即水錐型、縱竄型及縱竄橫侵型。 (4)基于主力氣藏氣井出水和氣藏水侵現(xiàn)狀,在氣井出水規(guī)律和氣藏水侵影響因素敏感性分析所得成果的指導下,分別從氣藏角度與單井角度提出了合理的治水對策。 通過本文的研究工作,對主力氣藏氣井出水規(guī)律和氣藏水侵機理的認識更加充分,進而提出的治水對策對實現(xiàn)M氣田主力氣藏的合理開發(fā)具有重要指導意義,同時也為類似氣藏的開發(fā)提供借鑒。
[Abstract]:At present, most of the gas reservoirs which have been proved at home and abroad belong to different degree of water drive gas reservoirs. Water invasion of gas reservoir will restrain single well productivity, increase gas reservoir abandonment pressure and reduce gas reservoir recovery. In this paper, based on CNPC overseas natural gas exploration and development cooperation project, the main gas reservoirs in M gas field, S gas reservoir and BP gas reservoir, are taken as the research objects. With the continuous expansion of gas reservoir development scale and the prolongation of gas well production time, gas well effluent and gas reservoir water invasion gradually become the main factors restricting the overall development effect of gas reservoir. Therefore, this paper focuses on the main gas reservoir water invasion problem, the gas reservoir general situation, the gas well effluent law, the gas reservoir water invasion mechanism and the gas reservoir water treatment countermeasure, has mainly completed the following work: 1) based on the geological exploration data, pressure data and production performance data of the main gas reservoir, this paper analyzes the geological characteristics of the gas reservoir, the distribution characteristics of the gas and water layers, the connectivity of the gas reservoir and the present situation of development. It is concluded that the S gas reservoir is a weak edge bottom water gas reservoir with normal temperature and pressure system with pore (hole) type and medium to high porosity and high permeability. The BP gas reservoir with unified pressure system is a normal temperature gas reservoir controlled by structure and lithology, and a strong edge bottom water gas reservoir with high pressure and ultra high pressure system. The interwell connectivity between eastern and western blocks is poor, and that between gas wells in western blocks is better. 2) analyzing the production performance data of main gas reservoir from 2009 to 2014, it is concluded that the main condensate water is produced by gas wells in S gas reservoir, and the production wells of BP gas reservoir are located in the western block and are all in stable production at the bottom of some old wells. The water / gas ratio of the gas wells near the large fault increases rapidly, which leads to the increase of the risk of the effluent, and the gas wells in the eastern block are all shut down because of the serious effluent. The main types of water source of gas well are condensate water, primary movable water in layer, secondary movable water in layer, side and bottom water and working fluid backflow, etc., combined with production performance curve of typical production well and variation characteristics of gas well water / gas ratio in main gas reservoir, It is concluded that the characteristics of gas well effluent include four types, that is, a small amount of steady production of water, a small amount of slow increase of effluent, a rapid increase of medium effluent and a sharp increase of large amount of water, and an analysis of the formation mechanism of gas well effusion, Then according to different well types of gas reservoir (vertical well and horizontal well), the critical fluid carrying flow model of gas well is used to diagnose the fluid accumulation of gas well, and the Li Min model and Belfroid model are selected. According to the model of Li Min, the diagnostic chart of critical liquid carrying rate of gas reservoir is made. Based on the analysis of the percolation law of gas reservoir and the main influencing factors of water invasion in water-bearing gas reservoir, the model of water invasion mechanism of gas reservoir is established by using Eclipse numerical simulation software and the sensitivity analysis of influencing factors is carried out. It is considered that the fracture system is the main determinant of water invasion in the fracture-pore gas reservoir, the water ratio is the key factor to determine the water invasion activity of the gas reservoir, and the gas recovery rate is the main means to control the water invasion. The horizontal section length and water evading height of horizontal well also have great influence on the water invasion of gas reservoir, and the analysis of water invasion mode of gas reservoir shows that there are mainly three types, namely, water cone type, longitudinal channeling type and longitudinal channeling transgression type. 4) based on the current situation of gas well effluent and gas reservoir water invasion in main gas reservoir, under the guidance of the results obtained from the analysis of the gas well effluent law and the sensitivity analysis of gas reservoir water invasion influencing factors, reasonable water control measures are put forward from the gas reservoir angle and the single well angle respectively. Through the research work in this paper, we have a better understanding of the water flow law of the main gas well and the mechanism of water invasion of the main gas reservoir, and then put forward the water control measures which have important guiding significance to realize the rational development of the main gas reservoir in M gas field. At the same time, it also provides reference for the development of similar gas reservoirs.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE37

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