發(fā)布時(shí)間：2018-07-27 17:37

【摘要】：目前,蘇里格氣田已進(jìn)入大規(guī)模的生產(chǎn)開(kāi)發(fā)階段,氣田產(chǎn)能快速攀升,己成為長(zhǎng)慶氣區(qū)年產(chǎn)規(guī)模最大的氣田。隨著氣藏的開(kāi)發(fā),氣田產(chǎn)水井逐漸增多,據(jù)統(tǒng)計(jì),截止2014年底蘇里格氣田產(chǎn)水井占總井?dāng)?shù)的40%左右。同時(shí),為使薄而多氣層段的井得到有效開(kāi)發(fā),氣田采用了油管機(jī)械封隔分壓合采一體化完井管柱生產(chǎn),且油管中大多裝有節(jié)流器,導(dǎo)致常用的積液判識(shí)方法己不再適用,如何判斷帶節(jié)流器氣井的井筒積液己成為困擾蘇里格氣田生產(chǎn)的重要問(wèn)題。為節(jié)約成本,蘇里格氣田采用簡(jiǎn)化的地面流程,導(dǎo)致單井的產(chǎn)水量數(shù)據(jù)和實(shí)測(cè)井底壓力數(shù)據(jù)存在一定的缺位,這也給井筒積液預(yù)測(cè)帶來(lái)了更多的困難。本文建立的針對(duì)蘇里格生產(chǎn)特征的積液預(yù)測(cè)模型能較好地解決上述難題,對(duì)整個(gè)氣田乃至其它低滲氣田產(chǎn)水井的研究都具有一定的指導(dǎo)和借鑒意義。 本文在綜合考慮氣井的儲(chǔ)量、配產(chǎn)比、采氣速度等因素基礎(chǔ)上,分別分析了氣井不積液時(shí)套壓的變化特征以及積液速率與套壓斜率的量化特征,從而建立了利用套壓曲線和產(chǎn)量變化特征預(yù)測(cè)環(huán)空積液高度的新方法。進(jìn)一步獲得了一種以套壓計(jì)算得到的井底流壓為約束、利用油壓預(yù)測(cè)油管積液量的新方法,并最終形成了一套適用于蘇里格氣田的井筒積液預(yù)測(cè)模型。通過(guò)模型,結(jié)合理論計(jì)算和實(shí)測(cè)數(shù)據(jù)分析,給出了蘇里格氣井積液判識(shí)技術(shù)的評(píng)價(jià)方法,不僅可以判斷井筒的積液情況還可以計(jì)算出井筒中具體的積液量,為預(yù)防井筒積液和后期排水采氣工作提供了重要依據(jù)。
[Abstract]:At present, Sulige gas field has entered the stage of large-scale production and development, and the gas field productivity is rising rapidly, which has become the largest gas field in Changqing gas area. With the development of gas reservoir, gas field production wells are increasing gradually. According to statistics, Sulige gas production wells account for about 40% of the total wells by the end of 2014. At the same time, in order to make the well of thin and multi-gas reservoir effectively developed, the gas field adopts the tubing mechanical sealing, partitioning, pressure and production integrated well string production, and most of the tubing are equipped with throttle, so the commonly used method of accumulative liquid recognition is no longer applicable. How to judge the wellbore fluid accumulation with throttle has become an important problem in Sulige gas field production. In order to save the cost, Sulige gas field adopts a simplified surface flow, which leads to the absence of single well water production data and measured bottom hole pressure data, which also brings more difficulties to the prediction of wellbore fluid accumulation. The liquid accumulation prediction model established in this paper for Sulige production characteristics can solve the above problems well and has certain guiding and referential significance for the study of the whole gas field and other low-permeability gas production wells. On the basis of synthetically considering the reserves, production ratio and gas recovery rate of gas wells, the variation characteristics of casing pressure and the quantitative characteristics of fluid accumulation rate and casing pressure slope of gas wells without fluid accumulation are analyzed respectively in this paper. A new method for predicting the height of liquid accumulation in annulus is established by using the casing pressure curve and the characteristics of output variation. A new method of predicting tubing fluid accumulation by oil pressure is obtained, which is constrained by the bottom hole flow pressure calculated by casing pressure. Finally, a set of wellbore fluid accumulation prediction model suitable for Sulige gas field is formed. Through the model, combined with the theoretical calculation and the analysis of the measured data, the evaluation method of sullige gas well accumulation identification technology is given, which can not only judge the wellbore fluid accumulation but also calculate the specific fluid accumulation in the wellbore. It provides an important basis for the prevention of wellbore fluid accumulation and later drainage and gas production.
【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)】：TE377

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