發(fā)布時間：2019-06-22 13:53

【摘要】：經(jīng)過30多年的開發(fā),中國的稠油開采工業(yè)已經(jīng)逐漸成熟,隨著稀油資源的日趨減少,稠油資源逐漸成為當前乃至今后的主要能源。但是隨著蒸汽吞吐工藝的越發(fā)成熟,伴生而來的套管損壞問題也越來越嚴重,經(jīng)濟效益也因此而受到了嚴重影響。因此對套管的力學性能進行分析,了解套管損壞機理,提出適當?shù)姆乐未胧┢仍诿冀蕖?本文首先分別對均勻載荷與非均勻載荷作用下的套管抗擠強度進行了分析,然后對影響井筒—地層溫度場的因素進行分析。再利用熱傳遞基本理論,通過井筒內(nèi)能量守恒、動量守恒和質(zhì)量守恒方程,結(jié)合單相穩(wěn)定流井筒溫度場預(yù)測模型,編制注蒸汽熱采井燜井階段井筒壓力場、溫度場預(yù)測軟件。早期在新疆油田對于稠油區(qū)塊溫度場的調(diào)研中發(fā)現(xiàn),現(xiàn)場工人對于燜井階段井筒內(nèi)的溫度分布并不十分了解,甚至完全沒有對井筒內(nèi)溫度進行過測量,這對于提早預(yù)防套管損壞是非常不利的,所以本程序結(jié)合調(diào)研得到的兩組現(xiàn)場實際井況進行分析計算,并得到兩組溫度場、壓力場數(shù)據(jù)組,并在與現(xiàn)場調(diào)研之后得到的實測數(shù)據(jù)比對之后發(fā)現(xiàn),溫度場、壓力場的變化趨勢及數(shù)據(jù)基本一致,誤差不大于5%,因此可以判斷此模型與軟件能夠使用于新疆油田百口泉重油區(qū)塊。 在得到井筒溫度場模型后,應(yīng)用熱應(yīng)力基本理論,對套管水泥環(huán)在熱應(yīng)力作用下受力進行分析,并建立套管水泥環(huán)界面接觸壓力模型。對套管-水泥環(huán)之間的接觸壓力以及水泥環(huán)與地層之間的圍巖壓力進行分析；并結(jié)合現(xiàn)場井況分別計算出注入380℃至320℃高溫蒸汽時套管水泥環(huán)地層體系受到的應(yīng)力以及產(chǎn)生的位移。 在文章的最后,通過上文中對于井筒溫度場壓力場的分析,以及套管水泥環(huán)受力的分析,并結(jié)合在新疆油田百口泉區(qū)塊調(diào)研得到的套管損壞情況,得到了套損的主要形式,并對套管損壞機理進行了分析研究,提出了防治套管損壞的若干方法。 本文主要是利用所編制軟件對油田現(xiàn)場某井進行溫度場、壓力場的預(yù)測,在發(fā)生套管損壞之前就對套管受力進行提早的分析研究,以便有效的緩解現(xiàn)在各大油田都非常關(guān)注的套管損壞情況。
[Abstract]:After more than 30 years of development, China's heavy oil production industry has gradually matured. With the decrease of dilute oil resources, heavy oil resources have gradually become the main energy source at present and even in the future. However, with the maturity of steam huff and puff technology, the associated casing damage problem is becoming more and more serious, and the economic benefit has been seriously affected. Therefore, it is urgent to analyze the mechanical properties of casing, understand the damage mechanism of casing, and put forward appropriate prevention and control measures. In this paper, the extrusion strength of casing under uniform load and non-uniform load is analyzed respectively, and then the factors affecting the temperature field of wellbore and formation are analyzed. Based on the basic theory of heat transfer, through the equations of energy conservation, momentum conservation and mass conservation in wellbore, combined with the prediction model of single-phase steady flow wellbore temperature field, the wellbore pressure field and temperature field prediction software in steaming stage of steam injection thermal production well are compiled. In the early investigation of temperature field in heavy oil block in Xinjiang Oilfield, it was found that the field workers did not know very much about the temperature distribution in the wellbore in the braised stage, and even did not measure the temperature in the wellbore at all, which was very disadvantageous to prevent casing damage early. Therefore, this program combined with the two groups of actual well conditions obtained from the investigation, and obtained two groups of temperature field and pressure field data sets. After comparing with the measured data obtained after field investigation, it is found that the variation trend and data of temperature field and pressure field are basically the same, and the error is less than 5%. Therefore, it can be judged that the model and software can be used in Baikouquan heavy oil block of Xinjiang Oilfield. After the wellbore temperature field model is obtained, the stress of casing cement ring under thermal stress is analyzed by using the basic theory of thermal stress, and the interface contact pressure model of casing cement ring is established. The contact pressure between casing and cement ring and the surrounding rock pressure between cement ring and formation are analyzed, and the stress and displacement of casing cement ring formation system after injecting high temperature steam from 380 鈩，

本文編號：2504644