川渝地区钻探作业中,长裸眼井段、多压力层系并存、安全密度窗口窄、井漏和溢流共存现象较为普遍,因而固井面临漏失低返、顶替效率低下以及固井后环空带压影响固井质量和井完整性等问题.通过应用精细控压固井新技术,准确掌握地层压力和漏失压力、精确计算固井下套管与泵注期间环空动当量密度,量化作业窗口区间值,使井筒静液柱压力与井口动态控压之和全程处于窄窗口区间内,达到压稳防漏之目的.精细控压固井技术在川渝地区已开展20余井次现场应用,施工过程中均未发生井漏和溢流现象,后期无窜气,固井质量合格率高于80％,较常规方法固井质量的优质率与合格率平均值,提高20％～30％.精细控压固井技术解决了技术难题,为川渝地区窄安全密度窗口天然气深井固井提供了新的技术途径.

Analyzed in the paper are the relevant data of casing damages occurred in domestic shale gas exploiting operations as well as the exsisting shale gas well conditions to find out the fundamental causes for point deformations appeared on casings.The analysis indicates that when the external non-uniform load borne by a casing body exceeds its limit, it will lead to overall structure instability of the casing and cause point deformation.The bearable non-uniform load for a casing is calculated by finite element method and verified by actual product evaluation test to provide a precise theoretical basis for the type selection of casings for shale gas well.Some solutions for reducing casing damages in shale gas wells are put forward.

目前5700测井系统中的岩性密度仪器主要包括2228XA、2234XA等,文章主要针对2228EA+ 2228MA仪器的工作模式和电路等方面进行总结,并对典型故障进行分析解决.

The Yun'an Well 002-7 at the Yun'anchang structure in East Sichuan Basin is a ultra-deep and highly deviated well with high pressure and the drilling fluid had a narrow density window when the cementing with φ177.8 mm liner was done in this well.Plugging had been carried out several times at φ215.9 mm borehole section for a long time,consuming a large amount of drilling fluid(1418.1 m3),but the borehole section still failed to meet the conventional cementing requirements like neither overflow nor leakage,smooth drifting,clean borehole,etc.In addition,it is difficult to increase the bearing capacity of well shaft.From the perspective of borehole conditions,lost circulation was found in many layers at different positions,the liquid level was lower than the wellhead,several gas-bearing horizons were involved,drilling fluid density was quite high(1.80 g/cm3),open hole section was very long(2538.28 m),and borehole trajectory was complicated.In order to solve technical problems in inserting the liner casing,such as failure to return at wellhead,lack of circulation by sections,inability to discharge residuals,and liner hanger setting down too early,the following measures were taken to allow the liner to be successfully inserted into the hole to the designed depth: casing obstruction prevention,nozzle congestion prevention,and positive pumping-reversal squeezing of slurry for perfect cementing.The logging results show that the high-pressure gas reservoir at φ215.9 mm borehole section is effectively sealed and cementing quality meets the requirement of the next phase of safe drilling operation.The successful cementing with φ177.8 mm liner provides strong technical support for cementing in similar complicated gas wells in the future.

酸化措施是碳酸盐岩、砂岩油气井增产的重要措施之一,而酸化效果在很大程度上取决于使用的酸化工作液和酸化工艺,针对不同改造区域的地质条件和地层情况,选择不同酸液体系的工作变得尤为重要.58043井是克80井区P1f层生产井,该井自2001年3月22日投产以来共进行过2次针对油层的酸化改造措施,取得了较好增油效果.主要就这2次酸化措施的设计、施工和效果情况做一分析,为今后的酸化设计及施工提供依据.

地下储气库通常有四种类型,即利用含水多孔地层储气,利用盐矿层建造储气库储气,利用枯竭油气田储气和利用岩穴储气。地下储气库内的气体主要由气垫气、工作气及未动用气组成。氮气的制造技术已相当成熟,如果能实现氮气作为垫层气,将会节约大量的投资。随着我国储气库的发展,地下储气库的功能也会发生改变,将由调峰型向储备型发展。

In this article,the characteristics of volcanic reservoir in Daqing are studied systematically by systematic experiments,such as porosity and permeability,rack structure and reservoir space,heterogeneity,pore and throat characteristic,irreducible water saturation,stress sensibility.The result is significant to realizing the similar reservoir characteristics and to developing volcanic gas reservoir in Daqing.