底水油藏射孔优化设计

为了优化底水油藏的生产参数，研究了不同产量时射孔长度的优化方法。采用球面流和径向流相结合的模型推导了临界产量和无水采油量的计算公式，分别以临界产量和无水采油量为标准，对胜利油田桩西区块底水油藏上6口油井的射孔长度进行了优化设计，优化结果表明，对于底水油藏应首先按照临界产量对射孔长度进行优化设计，如果得到的最大临界产量不符合实际生产的要求，就应按照无水采油量进行射孔优化设计。研究表明，当油井产量超过临界产量后，以临界产量为标准得到的优化射孔长度会减小油井的无水采油量。     

Horizontal wells and steam-assisted gravity drainage

Petroleum can be produced more efficiently using horizontal wells instead of conventional wells. For a typical 16 hectare well spacing, the pressure drawdown is as small as one-fiftieth of that for conventional wells. In some cases, where coning is a problem in conventional production, horizontal wells allow operation with much less coproduction of the displacing fluid. In the thermal recovery of bitumen and heavy oils, the Steam-Assisted Gravity Drainage process with horizontal production wells allows the systematic sweeping of the reservoir with economic production rates and without steam bypass. This paper described and reviews the application of horizontal wells to the production of heavy crude oils and bitumen by both non-thermal and thermal methods.     

新的捷联惯性导航划桨误差补偿算法

针对实际捷联惯性导航系统解算中的圆锥误差和划桨误差,结合已解算出的当前时刻之前两个周期的姿态信息对旋转矢量进行修正的算法,利用算法的对偶性原理,将该算法应用于划桨误差补偿算法中。在划桨运动下对该算法进行了仿真,仿真结果表明,该划桨误差补偿算法具有与解析解相当的精度。     

防飞溅型络筒油剂的研制

介绍了防飞溅型络筒油剂研究的背景和油剂研究过程中主要解决的问题及所起的作用     

含水煤岩体瓦斯压力测定的水锥效应研究

针对直接法瓦斯压力测定过程中受承压水影响的问题进行分析研究,通过查阅国内外文献发现,目前含水煤岩层瓦斯压力测定过程中,考虑煤层透气性系数、吸附特性的水锥效应尚未有人研究。针对此建立了动态水锥突破钻孔界限理论模型,分析认为瓦斯压力测定过程中放空时瓦斯流量最大,水锥突破速度最快,封孔后气体流量减少后影响变小。推导出了动态水锥上升过程中突破钻孔界限的时间与瓦斯流量、煤层厚度、钻孔深度及煤的孔隙率的关系式。并举例计算了不同流量、煤层厚度及钻孔长度下水锥突破界限的时间,发现,突破时间随流量的增大显著减小,流量一定时,随钻孔深度的增加,先经历一个变化较小过程,然后大幅度减小。工程上利用球向流场进行瓦斯压力时,可以通过缩短放空时间避免煤层水锥效应对测压的影响。     

曙一区古潜山油藏气体压锥化学堵水技术研究与应用

曙光油田曙一区古潜山油藏,构造上位于辽河断陷西部凹陷西斜坡中段。属于边底水和裂缝发育的块状稠油潜山油藏,具有油稠、底水能量充足、纵横向裂缝均发育等特点。底水锥进已成为制约该区块开发的主要矛盾。随着油井吞吐轮次的增加,现有技术的局限性日渐凸。气体压锥化学堵水技术,通过气体筛选,配方堵剂及现场施工参数的优化设计,可大幅度增加堵剂的作用半径,提高油井的采收率,改善区块整体开发效果。     

Reduction of Oil and Gas Coning Effects by Production Cycling and Horizontal Wells

Abstract

This article investigates by simulation, coning mitigation during oil production from thin oil rim reservoirs using horizontal wells and production cycling. Production cycling is an operating technique in which the well is produced and then shut in for periods of time. During the shut-in periods, the cone reduces. This work suggests that production cycling delays water breakthrough. However, once breakthrough occurs, the well must be put on continuous production due to difficulties in unloading the wellbore and with the assistance of gas lift.     

注氮气控制稠油油藏底水水锥技术

针对单家寺稠油油藏主力油层水淹严重,热采油汽比接近蒸汽吞吐经济极限的现状,对注氮气控制底水锥进及热氮混注提高热采采收率技术进行了有益探索。矿场试验结果表明,该技术有效地抑制底水锥进和蒸汽超覆,改善了吞吐井生产效果,成为“十五”期间巨厚块状底水稠油油藏多周期吞吐后控制底水锥进、提高热采采收率的有效手段之一。     

Coning motion stability of wrap around fin rockets

Both the asymptotical stability criterion and the bounded stability criterion of the coning motion for wrap around fin(WAF) rockets are proposed through the analy-sis of coning motion equations,which can be easily used to determine the exis-tence of the coning motion during the rocket design. The correctness of the crite-rions is verified by mathematical simulation examples of a WAF rocket with differ-ent setting angles. It is also found that the setting angle of WAF has great effects on the rolling moment and side moment of the rocket.     

An experimental study on self-output-control characteristics of micro downwind rotor with coning soft blades

In this short paper,we have treated the aerodynamic performance of micro downwind rotor with coning soft blades experimentally.The test wind rotor has the tip diameter of 1.5 m and three two-dimensional NACA0018 blades of 0.15 m chord whose material is light,soft and pliable foam plastic for perfect safety.From the wind tunnel test,it is realized that the performance is manageable by the coning angle of the rotor blade.In the present case,an improvement of the performance in lower wind speeds is achieved by...