【摘要】：大慶油田進(jìn)入高含水階段并應(yīng)用三次采油技術(shù)后,單管簡化集油工藝已經(jīng)規(guī)�；茝V。單管串接工藝在運(yùn)行的過程中,管路內(nèi)壁出現(xiàn)凝油的現(xiàn)象時(shí)有發(fā)生,高回壓井的數(shù)量明顯增多,造成管路堵塞,壓力上升,管線結(jié)蠟嚴(yán)重,沖洗頻繁,直接影響油田的正常生產(chǎn)。為此,需要通過開展單管串接工藝凝油形成及壓力上升影響規(guī)律試驗(yàn)研究,分析導(dǎo)致單井回壓過高的原因,從而制定相應(yīng)的解決措施,最終有效解決由單井回壓過高所帶來的生產(chǎn)問題。本文以薩北過渡帶為主要對(duì)象,確定了凝油形成高峰溫度區(qū)間,研究不同工況下凝油形成規(guī)律,分析了凝油形成的影響因素、過程及機(jī)理;在室內(nèi)實(shí)驗(yàn)及理論研究的基礎(chǔ)上,選擇串接井組,開展了單管串接通球集油工藝適應(yīng)性現(xiàn)場試驗(yàn),進(jìn)一步分析了壓力、溫度、流型及凝油變化規(guī)律;結(jié)合室內(nèi)及現(xiàn)場試驗(yàn)對(duì)導(dǎo)致單井回壓過高的原因分析,從管輸最小流量和管輸起點(diǎn)最低溫度兩方面切入,確定了A01~A04隊(duì)共8個(gè)閥組間、轄250余口生產(chǎn)井的單管串接集輸技術(shù)界限,并針對(duì)此提出了覆蓋所有類別油井的高回壓治理措施。論文的主要成果有:(1)從介質(zhì)粘度和粘彈雙重特性出發(fā),確定了60~95%含水原油的凝油形成高峰溫度區(qū)間,含水率升高,凝油溫度值降低,95%含水原油的凝油溫度界限從60%含水時(shí)的34.6℃~20.0℃下降到32.5℃~17.4℃;(2)對(duì)A01~A04隊(duì)8個(gè)閥組間所轄的252口油井分類、分工況確定了滿足安全回油的管輸最小流量界限與起點(diǎn)最低溫度(井口最低出油溫度)界限;(3)通過總結(jié)高回壓油井特征,并基于單管串接流程集輸技術(shù)界限確定結(jié)果,分析了油井高回壓的成因,從地面工程設(shè)計(jì)、運(yùn)行管理及減阻預(yù)處理等方面提出了覆蓋區(qū)塊所有油井的高回壓治理措施。
[Abstract]:After Daqing Oilfield entered high water cut stage and applied tertiary oil recovery technology, single pipe simplified oil gathering technology has been popularized on a large scale. During the operation of the single pipe serial connection process, the phenomenon of condensing oil occurs from time to time on the inner wall of the pipeline, and the number of high return pressure wells increases obviously, which results in the blockage of the pipeline, the rise of the pressure, the serious wax deposition of the pipeline, and the frequent flushing. Directly affect the normal production of oil fields. Therefore, it is necessary to analyze the causes of excessive backpressure in single well through the experimental study on the formation of condensing oil and the influence of pressure rise in single pipe series connection process, and to formulate corresponding measures to solve the problem. Finally, the production problem caused by high return pressure in single well can be solved effectively. In this paper, taking the transitional zone of Sabei as the main object, the peak temperature interval of the formation of the condensed oil is determined, the formation law of the condensed oil under different working conditions is studied, and the influencing factors, processes and mechanisms of the formation of the condensing oil are analyzed. On the basis of laboratory experiment and theoretical research, the adaptability field test of single tube-connected ball gathering technology was carried out, and the variation law of pressure, temperature, flow pattern and condensing oil was further analyzed. Combined with laboratory and field tests, the causes of high backpressure in single well are analyzed. From two aspects of minimum flow rate and minimum temperature of pipeline transportation, the technical limits of single pipe series gathering and transportation of more than 250 production wells are determined among 8 valve groups of A01~A04 team. The treatment measures of high return pressure covering all kinds of wells are put forward. The main achievements of this paper are as follows: (1) based on the dual properties of medium viscosity and viscoelasticity, the peak temperature range of condensate formation of 60 ~ 95% water-cut crude oil is determined. The water cut increases and the condensate temperature decreases. The setting temperature limit of 95% water-cut crude oil decreased from 34.6 鈩，

本文編號(hào)：2384248