油井开采过程中井筒内的沉积堵塞物是制约油井正常生产,甚至停产的主要原因.为弄清哈拉哈塘油田油井堵塞物的主要成分并对堵塞物的形成位置以及沉积速度进行预测,利用红外光谱、DSC分析仪以及扫描电镜对堵塞物的化学组成、有机物类型以及微观形态进行分析,并建立了适用于描述堵塞物沉积的动态预测模型.结果表明,该区块主要是因蜡的沉积形成的堵塞物,蜡的熔点为71℃,并且建立的动态预测模型与现场实际情况的适配性较好.

To solve the problem of well bore blockage caused by the precipitation of,with the development of Ordovician reservoir,foreign material was experimental analyzed.According to results of study,the foreign material mainly was colloid and asphalting.The cause and effect of this dispersant in the process of lifting the oil were studied as well.Plug removal Agents HC-C20 which is best in dissolving blockage was screened out.Field application has shown that this dispersant can prevent the blockage caused by the precipitation of colloid and asphalt material effectively.

为了实现超深双台阶水平井分层注水工艺中的水嘴快速、准确选择,提出一种基于FLUENT的水嘴选择方法,采用FLUENT软件对配水器通道压降、不同孔径、不同流量下的水嘴压降进行模拟,形成孔径、流量、压差数据库,然后采用无量纲化处理方法建立水嘴三参数单曲线拟合公式,摒弃水嘴流通系数影响,实现已知过流量、压差,准确计算水嘴直径.现场2口双台阶水平的应用结果表明,该方法可快速准确完成配水器水嘴选择,一次选择成功率100％、单层配水精度提高了6倍,该项水嘴选择方法适用于井下所有圆形孔板类水嘴的选择.

In the process of oil displacement, CO2 emulsion can effectively control the mobility of CO2 which significantly im-proves the CO2 flooding effect and EOR. The AOT was selected as surfactants for CO2 emulsion. And the interfacial property of AOT aqueous solution and CO2 was characterized through TRACKER-H interfacial rheometer at different temperatures and pressures. Then the CO2 emulsion plugging and profile control shunt effect were evaluated through the core plugging experi-ment under different temperatures and pressures. It is found that with the increase of pressure, the interfacial tension of CO2 emulsion decreases, while the interfacial viscoelasticity increases. And with the increase of temperature, the interfacial ten-sion of CO2 emulsion increases, but the interfacial viscoelasticity decreases. It is also concluded that the high temperature is unfavorable to the emulsion plugging, while the high pressure is favorable to the emulsion plugging, which corresponds to the interfacial viscoelasticity, indicating CO2 emulsion plugging effect is related to its interfacial viscoelasticity. The results show that the temperature and pressure can affect the porous flow of CO2 emulsion via influencing its interfacial properties. Higher the strength of the CO2 emulsion, lower interfacial tension and better viscoelasticity can lead to signficant shunt effect.

When sealing channeling and plugging used by cement,a situation of"sealing but keeping certain permeability"or occurring channeling and leakoff may easily appear due to shrinkage of solidified body. In this paper,a new chemical plugging agent called LTTD,with high temperature resistance(150℃)and high salt tolerance(salinity of 25×10 4 mg∕L),is developed for casing-damage wells in Tarim oilfield. And then,its functions and mechanisms are analyzed and evaluated. Experimental study shows that this agent is capable of special plugging.

对于无水泥环固结的套管,现场经常发生套管的屈曲现象,对油气并的安全生产造成较大影响.井下套管受力复杂,对套管的屈曲分析尚缺乏成熟的认识.文章采用有限元数值模拟的方法对套管的屈曲变形进行了分析,模拟结果显示对于无水泥环固结的细长的套管结构,在材料未发生破坏之前先发生弯曲变形,造成生产事故.

In view of application of wellhead throttle unit in Dina2 gas field,for the purpose of accurately controlling gas produc-tion rate,regulation method for two-stage choke valve turndown ratio is studied and developed in this paper.Based on the relationship between oil pressure and production rate,this method is used to firstly control wellhead pressure and all-levels pressure after throttle to approximately control the production rate.And then,control valve Cv value is computed in accordance with relevant pressure and production rate.According to Cv value,two-stage choke valve turndown ratio is computed for accurate gas production regulation.Field application demonstrates that this method is one feasible means for efficient production regulation and wellhead parameter adjustment in anomalous pressure gas well.