According to the difficulty in dynamic reserves prediction induced by the low pressure, high adsorbed gas content and hard pressure-up test of continental shale gas in Yan ’an Area, this paper use the gas percolation theory and reservoir engineering method to establish a flow material balance model suitable for the calculation of dynamic reserves of continental shale gas in Yan’an Area on the basis of traditional flow mass balance method. Furthermore, combined with actual production data, the dynamic reserves of actual continental shale gas wells are evaluated. The results showed that: 1) The traditional flow mass balance method ignores the variations of gas compression coefficient（C g ） and viscosity（μ g ） during the production process, which are very significant under the conditions of low pressure and high adsorption capacity of continental shale gas in Yan ’an Area; 2) Ignoring the change of μ g C g and the desorption effect of adsorbed gas during the step-down process of shale gas will lead to a low predicted dynamic reserve; 3) Taking a continental shale gas well in Yan ’an Area as an example, the dynamic reserves of this well are predicted to be 2.2×10~7 m~3 by using the established method, which is 10% higher than that of the traditional method. Meanwhile, it also shows that the area where the well is located has certain development prospects. The study has important guiding significance for the production system and production prediction of terrestrial shale gas in Yan’an Area.

In order to further accelerate the exploitation of continental shale gas in Yan’an Area. In view of the situation that thin interbedding sandstones are commonly developed in continental shale gas reservoirs in Ordos Basin, a production prediction model with or without crossflow is derived based on the improved capacitance resistance method. Aiming at three typical reservoir lithology assemblages（sandstone-shale, shale-sandstone-shale and sandstone-shale-sandstone combination）, the comparative analysis and sensitivity analysis are adopted. The result show that: 1) When crossflow exists, thin interbedded sandstone layers communicate shale gas layers, the initial production of gas wells increases about 5～10 times; 2) When there is no crossflow, the multi-layer reservoir can show the early decline characteristics of high permeability layer（thin interbedded sandstone）, which mean the initial production of gas well is high and the stable production time is short.The later decline characteristics of low permeability layer（shale） is similar to the decline characteristics of oil and gas in low permeability matrix, which show that gas wells produce at lower rates for longer periods of time. It also provides theoretical support for the formulation of continental shale gas development plan.

长水平井+体积压裂是海相页岩气开发取得成功的主流技术,但我国的陆相/海陆过渡相页岩与海相页岩储层性质相差较大,陆相/海陆过渡相页岩的开发方式不能照搬海相页岩气的.本文提出陆相/海陆过渡相页岩应采用直井和水平井混合井型开发的技术思想.该技术思想的关键出发点在于陆相/海陆过渡相页岩(1)脆性矿物含量少,水平井体积压裂造复杂缝困难;(2)黏土矿物含量高,水平井体积压裂储层污染面积大;(3)纵向往往伴生其它非常规天然气资源(致密气、煤层气等),采用直井"多气合采"可以控制更多的储量.以鄂尔多斯盆地延长探区为例,本文详细论证了陆相/海陆过渡相页岩的上述特征对直井和水平井开发的影响,提出了基于水平井可控纵向储量占比、脆性指数、储层伤害表征参数和薄砂层占比4个参数的合理井型优选标准.结果表明,当水平井可控纵向储量占比<60％,脆性指数<35％,储层伤害表征参数>20％,薄砂层占比<10％时,可以采用直井开发,反之采用水平井开发.进一步地,基于该标准分析了延长组长7段和山西组山1段陆相页岩水平井与直井的开发实例.本文提出的思想突破了水平井是实现页岩气开发唯一方式的传统认识,强调了直井联合水平井开发陆相/海陆过渡相页岩气的优势,为实现陆相/海陆过渡相页岩气的经济有效开发奠定基础.

本文介绍了柱塞气举的工艺原理、工艺要求、柱塞类型及现场应用效果.

为了解决日益严重的气井积液问题,恢复气井正产生产,首次在延安地区陆相页岩气井上开展泡排适应性研究.通过Ross-Miles法和泡沫动态性能评价装置法,对6种起泡剂进行了室内评价.结果 表明:HY-3C起泡剂在起泡能力、稳定性、携液能力等方面优于其他5种起泡剂.将HY-3C在云平A、云平A-1和云平B井上进行试验,泡排试验效果较好,这为泡沫排水采气技术在延安地区陆相页岩气井上的推广应用奠定了基础.

针对延安气田下古生界气藏气井井下管柱根据标准推荐做法选择镍基合金投资过大或单一材质存在安全隐患的问题,通过耐硫化物应力腐蚀破裂性试验和腐蚀环境模拟试验,确定了在延安气田下古生界气藏条件下不同管材的腐蚀特性,评估了电偶腐蚀对组合管柱的影响,据此提出在管柱上部选用抗硫管材,下部选用L80-13Cr材质管道的分段选材方法.该方法能够有效延长管柱服役期限,降低采气工程投资成本,是一项有效的实用技术.

采用现场数据调研、宏观分析、金相分析、扫描电镜分析和XRD分析等方法,对某油田Ф73.02mm×5.51 mm P110油管腐蚀原因进行分析.分析认为:油管腐蚀的主要原因是该井高含量的CO2、Cl-、地层水、返排酸化压裂液共存造成的腐蚀,腐蚀程度与气液交界面的位置及井段温度有关.推荐使用耐CO2腐蚀的油套管产品.

The fifth member of the Ordovician Majiagou group is the main reservoir in Lower Palaeozoic reservoir of Yanchang gas field,with the characteristics of low-pressure,low porosity,low permeability,low permeability and tight,and natural gas generally contain corrosive gases such as H2S and CO2,in the process of production and operation,there is the risk that tubing will be corroded,damaged,fractured and pressure leakaged,which will seriously affecting the production of gas well. To solve this problem,from the point of view of technology and safety,we obtained a suitable completion string system of Lower Palaeozoic reservoir of Yanchang gas field,by researching and analysising completion tubing size,tubing structure,tubing material and wellhead,to lay the foundation for large-scale development of Yanchang gas field.

含硫气田在开发过程中,如果产出的天然气中含有H2S、CO2 、Cl-等腐蚀性介质,会导致严重的腐蚀问题,极易造成酸性气田开发过程中油套管和集输管线的腐蚀穿孔、断裂等问题,严重影响酸性气田的正常开发和生产,甚至有可能引起H2S气体的泄漏,并进一步导致环境污染、威胁人身安全.在此背景下,文章主要阐述了含硫酸性气田存在的主要腐蚀类型以及油套管的腐蚀机理,在此基础上,分析了主要腐蚀类型的影响因素.另外本文介绍了目前现场常用的几种油套管防腐措施.

油气田勘探开发中后期,低产低渗井占了绝大多数。这些绝大多数井(层)的DST测试资料分析方法的选择对于提高测试资料解释精度和符合率,正确评价、认识油气藏至关重要。文中根据DST测试变流量压力恢复测试的特点,理论联系生产实际分析了同一流动条件下变流量和定流量叠加分析方法对双对数、导数曲线形态影响的差异和解释结果参数存在的误差,其目的在于进一步提高DST试井资料的准确性,更好地服务于油气增储上产。

P302-2 w ell is the first w ell of system gas testing for Puguang G as F ield.The aim of gas testing is to try to know Puguang Construction of Feix ianguan G roup and Changx ing group 's natural gas production,and to prov ide the basis for the developm ent of Puguang reg ion.The w ell is h igh of gas capacity,h igh of pressure,h igh of su lphur,and the construction of th is w ell is very d ifficu lt.Before gas testing,the w ell 's geo log ical、pro jecting、construction and other designs are to undergo a rigorous assessm ent of experts,The w ell 's gas testing techno logy and equ ipm ent are dom estic and w orld advanced level.In th is paper,it introduce the w ho le process of construction techno logy,and aggregate the special techno logy and the experience to the reg ion fo llow-up test production of gas to prov ide Experience.