近年来,靖边气田主要采用电子压力计测试井筒压力梯度来分析确定井筒液面位置,估算井筒积液量以及判断气体临界流量,向积液气井采取合理的排水采气工艺提供科学的依据,对气井井筒排液起到了关键的作用.

当压裂气井裂缝内的气体流动速率较大时,天然气在裂缝中符合高速非达西渗流规律,渗流阻力显著增大,气井产量明显降低.此文修正了高速非达西渗流时裂缝有效渗透率的计算公式,并结合基于支撑剂数法的压裂设计方法,得出了高速气井非达西渗流的裂缝参数设计方法,给出了裂缝参数设计的步骤.通过实例计算得出,天然气在裂缝中为高速非达西渗流时,裂缝有效渗透率大幅度减小;当压裂所用的支撑剂质量一定时,设计所得的最优裂缝缝长明显缩短,最优裂缝缝宽明显增加.

东方地球物理公司研究院地质研究中心通过树立“质量效益”为中心的质量文化理念,服务企业发展战略;实施创新驱动战略,将创新作为质量效益提升的内驱力;实施品牌引领战略,用品牌效应拉动质量效益提升;实施人才培养战略,增强质量效益提升的源动力,取得了显著的经济效益和社会效益.

In middle area of Sulige gasfield,the Shihezi 8 Member of the middle Permian lower Shihezi Formation is the main production zone.Its sedimentary-facies types and characteristics suffer much controversy.In this paper,after a study on data from drilling,well logging and core analysis,it is illustrated that this member is a fluvial depositional system,braided-river one for the lower whereas meandering-river one for the upper.In addition,the sedimentary-faices distribution characteristics of both Su 6 and Su 14 areas are studied.Finally,the effect of sedimentary facies on reservoir is discussed.

Horizontal wells have been developed in the Jingbian Gas Field,Ordos Basin,since 2006,among which 20 wells had been drilled and completed by March 2011.For such wells,the vague acid fracturing was mainly adopted as the reservoir stimulation treatment,i.e.,drawing coiled tubes to achieve acid uniform distribution at the horizontal section and performing coiled tubing acid frac.This method works well for such horizontal wells with short horizontal sections.However,it is ineffective for such horizontal wells with long horizontal sections,where the reservoirs with bad petrophysical properties can not be stimulated effectively.Aiming at this problem,the hydraulic jetting perforation and segregated completion is conducted as a whole on the long horizontal sections of horizontal wells.This new stimulation treatment takes good advantage of the specific characteristic of water jet and combines the hydraulic perforation with hydraulic frac so as to be applied in many horizontal locations independently and continuously without the help of any mechanical seal equipments.With the purpose of reservoir stimulation in the Jingbian Gas Field,pilot tests of this new method were carried out on 5 horizontal wells in 2010.Remarkable results in reservoir stimulation treatment were made on 7 sections in the 114.3 mm screened pipe and 10 sections in the 139.7 mm open hole section.In addition,the working cycle was significantly shortened and the labor intensity was decreased.The successful field applications show that this new method with good adaptability in the Jingbian Gas Field can help enhance the per-well production and be widely applied in other fields.

With the continued development of Jingbian gasfield,reservoir pressure gradually decreases.In the workover process of low-pressure gas well,a large number of kill fluids leak into the formation,which can cause formation damage and result that the crud and sand cannot be washed effectively due to well washing circulation cannot be set up, affecting the normal production of gas wells.This paper takes the in-depth analysis of the technical difficulties existed in low pressure gas wells washing of Jingbian gas field,optimizing the Nitrogen foam sand-washing well technology through laboratory experiment and carrying out field application test.The results show that nitrogen foam sand-washing well technology can effectively reduce the leakage of flushing fluids,reduce formation damage and improve the sand carrying property,ensuring the rapid recovery of low-pressure gas well production.