综合利用钻井岩心、测井和分析测试等资料,结合湖盆重力流沉积学理论和相关研究成果,研究鄂尔多斯盆地陇东地区长 7 油层组深水重力流的沉积特征、分布特征和演化,并建立研究区沉积模式.结果表明:研究区发育块状层理细砂岩相、正粒序层理粉(细)砂岩相、平行层理粉砂岩相、波纹交错层理粉砂岩相、水平层理泥质粉砂岩相、暗色泥岩相、富有机质页岩相、凝灰岩相 8 种岩相类型,代表砂质碎屑流沉积、浊流沉积、半深湖—深湖原地沉积、火山碎屑沉积成因类型;陇东地区长 7 油层组发育深水重力流沉积,可划分为限制性水道沉积、非限制性水道沉积、天然堤沉积、水道间沉积、朵叶体沉积和半深湖—深湖泥沉积 6 种沉积微相,从斜坡区到湖盆中心,依次发育限制性水道沉积、非限制性水道沉积、朵叶体沉积;长 73 沉积时期多发育朵叶体沉积,长 72 沉积时期多发育(非)限制性水道沉积、天然堤沉积、朵叶体沉积,长 71 沉积时期多发育(非)限制性水道沉积和天然堤沉积;自长 73 至长 71 沉积时期,湖盆面积逐渐萎缩,湖岸线向盆地中心推进,且受物源影响,重力流砂体的发育规模变大,并不断向湖盆中心推进.该研究结果为深水油气勘探提供依据.

为研究鄂尔多斯盆地环江地区侏罗系延安组延10储层特征及主控因素,通过大量岩心观察、测井曲线对比分析、显微镜岩石薄片鉴定、扫描电子显微镜及压汞分析等手段,对环江地区延10砂岩储层的岩石学特征、孔隙特征、物性特征及主控因素进行了详细分析.结果表明:延10砂岩储层以长石岩屑砂岩、岩屑长石砂岩为主,长石石英砂岩、岩屑石英砂岩、岩屑砂岩次之,成熟度一般;区内不同区域间,填隙物的含量存在一定差异,由北至南、自西向东,填隙物含量整体呈降低的趋势;储集空间类型以粒间孔为主、长石溶孔次之,孔隙结构以Ⅱ型为主,平均孔隙度为13.08％,渗透率为54.49 mD;储层物性受沉积环境与成岩作用等多种因素影响;南部地区平均孔隙度和渗透率最高,储层物性最好,有利于油气资源富集.

针对鄂尔多斯盆地西南部三叠系延长组采用传统似等厚地层划分对比方案出现易穿层、难闭合的问题,以姬塬油田罗38区和罗211区为例,采用标志层控制,结合旋回特征,以相邻井逐井对比的方法开展了等时地层划分对比.发现延长组一直以来采用的似等厚地层划分对比方案是穿时的,长6等地层存在着前积、下超、尖灭等沉积现象,短距离内地层厚度变化极其明显,导致地层并不是都平行于长7底界分布.反思延长组传统分层方案中的K1标志层是盆地范围内可以对比的区域标志层,长7之上的其他标志层K2、K3、K4、K5在盆地范围内是穿时的,不能作为区域对比的标志层.建议在鄂尔多斯盆地三叠系延长组地层划分对比时,摈弃等厚地层思维,逐井对比识别局部标志层,并充分利用地震资料.

A Christmas tree is a key wellhead device consisting of valves and fittings used for controlling oil and gas well fluid. Generally, various combinations are applied on Christmas tree to meet the requirement of specific working conditions. In present work, fracture of a four-way flange of a KQ65 wellhead Christmas tree was investigated through mechanical properties testing, microstructure characterization and fractography analysis. It is revealed that the four-way flange possesses very low impact toughness, and its CVN impact energy was only 4 J at 243 K. Representative microstructure of the four-way flange consists of coarse polygonal ferrite and pearlite, and the size of pearlite cluster was up to 280 μm. Ferrite grains displayed networks along grain boundaries of pearlite colony. The brittle microstructure of the four-way flange was likely caused by inappropriate heat treatment process. In addition, fractography analysis showed that fracture crack initiated from the flange and four-way junction, where stress was concentrated and thus resulted in the dimensional and structural change of four-way flange. It is concluded that fracture failure of the KQ65 wellhead Christmas tree was caused by coupling effect of the brittle microstructure and the localized stress concentration.

长庆油田集输系统腐蚀问题日趋严重,对长庆油田环江区块和白豹区块不同油井集输系统的水样、腐蚀产物和腐蚀速率进行了系统研究.结果 表明:长庆油田集输系统水样中含有较高量的Ca2+、Mg2+、SO42-和HCO3;环江区块集输系统水样中的CO2和O2含量较高;环江区块腐蚀机理主要为由Ca2+、Mg2+和CO2引起的电化学腐蚀.白豹区块集输系统中含有较高量的H2S,H2S引起的电化学腐蚀是导致白豹区块集输系统腐蚀的主要因素.

Nanoscale transformation twins (NSTTs) were observed in high-strength pipeline steels of three different grades (X80–X100) having carbon content of 0.038–0.065 wt%. The microstructure and formation of the NSTTs were characterized by field emission transmission electron microscopy. The results showed that the NSTTs were generated in two body-centered cubic microstructures—polygonal ferrite and martensite—in the martensite–austenite (MA) islands. The NSTTs were nucleated at the grain boundaries (GBs) between polygonal ferrite and bainite or triple junctions of MA islands through the emission of Shockley partial dislocation from GBs during the austenite transformation to ferrite and bainite, and extended into the interior of the ferrite grains and MA islands. The NSTTs were typical {112} <111>-type twins. Most NSTTs displayed groups of twins. The thickness of twin plates in the groups of twins was less than 10 nm.

HJ油田侏罗系油藏经过几年的开采,部分区块已进入中高含水期,为了保证油田稳产、提高油藏采收率,通过室内填砂管实验研究了聚合物微球类型、浓度及注入量对封堵效果的影响,在HJ油田侏罗系油藏开展了聚合物微球深部调驱试验.研究结果表明,注入0.3 PV的浓度5000 mg/L的WQ100型聚丙酰胺类纳米级聚合物微球(初始粒径约0.1μm,膨胀倍数5数20倍)可使物性与HJ油田侏罗系油藏相似的填砂管的渗透率降低85％以上.HJ油田侏罗系油藏延7层L242区和延9层L141区的聚合物微球调驱矿场试验结果表明:WQ100型聚合物微球对储层渗透率处于6×10-3数9×10-3μm2的井组的调驱效果较好,渗透率高于该范围井组封堵作用不明显,物性较差、水井油压接近系统压力井组不适宜于开展微球调驱.

本文宏观分析白豹油田白157区长4+5油藏吸水剖面分布特征,以期为后期油田动态监测提供依据.

含水油井的套管破损严重影响着油田的产量和运行安全,破损套管的修复成为困扰油田的一大难题.采用CJ40-400多参数组合测井仪进行工程测井,精确测定套损管的腐蚀穿孔位置及穿孔尺寸,利用研制的Y445型封隔器对套管穿孔部位进行封堵隔离,从而使套损停产油井恢复生产,提高了出油产量,取得了良好的治理效果.

Because of the low porosity and special-low,ultra-low permeability of chang6 reservoir in Huanjiang oilfield,we fully use the logging information to analyze the reservoir logging response characteristics.The main factors which affect reservoir productivity are effective thickness of reservoir,oil saturation,porosity and permeability.Combining with oil test,logging data,reservoir electrical characteristics and logging data processing results,we obtained the identification criterion of different oil and water layers with different productivity in Chang6 reservoir in Huanjiang oilfield.Established are relationship plates between the productivity factors and oil test output per day of developed well.We classify the reservoir level by oil production per meter daily and establish quantitative evaluation model with higher accuracy of reservoir production capacity.The above criterion is successfully used in qualitative identification and quantitative forecast of chang6 reservoir productivity in Huanjiang oilfield.The well test productivity is obtained by the logging means so to correctly choose favorabl test layer and guide the exploration and development of oilfield.