苏里格气田气井产量普遍较低，气井自身携液能力差，排水采气是产水气井连续稳定生产重要工艺措施。泡沫排水采气工艺由于其成本低、易操作等优点在苏里格气田得到大规模应用，但井下节流技术、单井无液量计量等对泡沫排水采气技术的推广应用也带来一些挑战。文章通过对苏里格气田泡沫排水采气工艺应用过程中存在的问题及技术难点进行分析，总结提出适时起出节流器、应用橇装计量装置、完善消泡工艺、推广应用井口自动加药装置等对策，并取得一定效果，这对同类气田泡沫排水采气工艺应用具有借鉴意义。

气井生产一定时间后储层压力系数低,单井产量低,常规修井作业存在压井液漏失严重,液体返排困难,储层伤害严重等诸多难题,同时高昂的压井材料及排液费用与"低成本"开发思路相悖.带压作业是一种先进的井下作业技术,主要优点是作业过程无需压井,节约了压井成本和时间,能够最大限度地减少对储层的污染,确保气井产能不受影响.2011年起苏里格气田采用带压作业装置顺利实现了井口压力低于15 MPa,管柱结构为光油管、单封及双封的气井修井作业,相比常规修井作业缩短周期40％,减低了施工费用近50％,避免了储层伤害,为气井带压修井作业积累了经验.本文总结了苏里格气田气井带压修井技术应用情况,分析了存在问题,并结合气田开发实际就带压修井技术应用前景进行了探讨.

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.

靖边气田试井解释主要应用基础模型进行解释,对试井软件中的扩展模型应用较少,本文应用2-Φ径向复合模型和双层双渗模型对实际工作中遇到的复杂试井曲线进行了完美拟合,并结合地质情况验证解释结果的准确性,为今后试井解释工作提供参考。

介绍了靖边气田低压气井洗井作业中面临的难题,低伤害洗井工艺技术现状,氮气泡沫液性能试验分析以及现场应用效果,试验证实氮气泡沫洗井工艺可以有效的减少地层漏失,携砂性能好,在靖边气田低压气井的洗井作业中,效果良好,对地层伤害小,有利于低压气井的产量恢复.

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.

To solve the problems such as acid maldistribution,incomplete reservoir stimulation,a big risk of downhole stuck of coiled tubes and difficult drainage during the development of the horizontal wells in Jingbian gas fields,we carried out a study on the new technologies of the horizontal well testing by use of literature search,theoretical calculation,and field tests.Then,a series of proper stimulation technologies were adopted to the horizontal wells in Jingbian gas fields.(1)The technology of deep acid-fracturing treatment by evenly distributed acid while drawing coiled tubes achieved acid uniform distribution at the horizontal part and guaranteed that the gas producing formation was efficiently stimulated.(2)The structure of the operating tool string of coiled tubes was optimized,which eliminated the risk of tight pull and casing sticking.(3)The techniques on nitrogen gas generation system and coiled tube unloading were innovated,which achieved fast unloading for the horizontal wells and promoted the well to be put into operation in time.All the above technologies will provide robust technical support for the scale development of the horizontal wells in Jingbian gas fields.The results of field application show that the new techniques for well testing are with strong flexibility for Jingbian gas fields,which can be promoted in use.

Low-permeability gas reservoirs are characterized by narrow channels, relatively great percolating resistance, relatively great surface tension of liquid-solid and liquid-gas interface, which makes the relative decline of gas well reservoirs permeability and results in water lock of reservoir, seriously affecting gas wells production, for the reason that formation water or external fluid (especially drilling fluid, killing fluid, and acidizing and fracturing fluid, etc.) is not drained away in the production process of gas wells. The relative permeability of gas information in gas wells is determined by the characteristics of water saturation in porous medium and the gas fractional flow with the existence of water. Therefore, by reducing the water saturation in reservoirs near well-bore area and changing the fractional flow of gas, the water lock effect can be relieved. Laboratory evaluation tests and field tests showed that the gas well plugging agent, which compounded by surfactants and low capillary acidizing fluid, can relieve the water lock effect in gas reservoir, increase gas phase permeability of producing formation, and enhance gas production of gas wells significantly.