塔里木中部地区奥陶系油藏主要采用水平井开发模式实施长段地质目标穿越,钻井深度普遍在7 000 m左右.目的层奥陶系储层地质条件复杂、缝洞发育、钻井液安全密度窗口超窄,钻井过程中普遍发生恶性漏失,严重制约了该油藏的勘探开发进程.由于大型溶洞和裂缝的存在,传统堵漏材料结合常规堵漏技术治理塔中地区奥陶系恶性漏失成功率较低;为此,文章分析了塔中奥陶系储层漏失特征和堵漏难题,在此基础上提出了"投球架桥变缝洞为孔,多种堵漏材料协同充填封堵"的树脂球堵漏工艺技术.树脂球堵漏技术在X井恶性井漏治理中的成功应用表明,该技术可有效解决塔中区块大型缝洞恶性漏失问题.文章研究成果为塔中区块奥陶系恶性井漏的治理提供了一种新技术思路,将有助于提高该区块的堵漏作业效果.

普光气田飞仙关组三段碳酸盐岩气藏储量丰富,动用程度低,是资源接替的重要层系.为了搞清碳酸盐岩储层发育规律及分布特征,综合利用岩心、测井等资料,以储层的沉积环境和成岩演化作用为基础,分析储层岩石结构、孔渗特征和储集空间,进一步研究储层发育的主控因素.研究结果表明:飞三段中、下亚段普遍发育微生物碳酸盐岩,岩石类型以凝块石、叠层石、凝块—叠层石为主,储集岩性主要为凝块云岩、叠层云岩,灰岩岩性致密,储集性能极差,储集空间包括微生物格架孔、体腔孔、凝块间溶孔、晶间孔.储层主要受沉积环境、白云岩化作用以及溶蚀作用的影响,微生物黏结颗粒岩是优质储层形成的基础条件,凝块—叠层结构储层发育,白云化作用有利于孔隙的保存,后期溶蚀作用进一步改善储集空间.研究成果明确了飞三段微生物储层分布特征,为后期井位部署提供指导.

Silane coupling agent grafted to 1.2μSiC powder and graded with 100μSiC powder,studies the relationship of SiC powder Zeta potential and slurry solid-phase volume content,viscosity increment. In alkaline conditions,SiC surface hydrolysis is the reason of the Zeta potential changes and paste viscosity loss.Inspects the wetting agents ethylene oxide,Ethoxylate Alcohol ether(AEO)to the influence of Zeta potential loss.Joining 0.08wt%AEO,68vol%of modified slurry after stiring 12h,Zeta potential loss reduced from 22%to 10%,viscosity increment from 630mPa?s to 230mPa ?s and green density increased to 2.69 g/cm~(-3).

In this paper,the effects of pressure forming and gel-casting on the microstructure and bending strength of RBSC have been presented.SEM analysis indicated that the green-compact acquired by pressure forming revealed an uneven distribution of micro-pore structure,while the green body formed by gel-casting showed a uniform microstructure: SiC and C surrounded by each other and dispersed homogeneously.Microstructure analysis showed that the combination of metallographic observation and mercury penetration analysis could reflect the structure of the green body more accurately.Compared with pressure forming,RBSC obtained by gel-casting showed a more uniform distribution of free silicon,which was an important factor for the improvement of RBSC's bending strength.The RBSC with a uniform microstructure and fewer internal defects was obtained by Gel-casting using the modified SiC powder(0.8μm) and the highest bending strength came up to 690MPa.