苏东南区为典型的"三低"气藏,低产、低效井多,气井自身携液困难,部分气井甚至出现积液停产现象,影响正常生产.柱塞气举通过建立稳定的气水机械界面举升液体,具有气量要求低、举升效率高、自动化程度高等优势,是低产气井排水采气的主体技术之一.本文通过分析柱塞气举单体工艺、区域开发动态及地面配套工艺,从装置安全性、稳定性及措施效果等方面提出了示范区综合评价方法,论证了建设苏东南区柱塞气举排水采气示范区的可行性,对苏里格气田低产低效气井柱塞气举工艺规模化应用具有一定的指导意义.

随着靖边气田开发时间的延长,部分气井表现出不同程度的井筒结垢现象,导致井筒压降损失增大,严重影响气井自主携液生产及产能发挥、常规测试作业的正常开展.通过开展系列室内实验,对典型井井筒垢样进行成分分析鉴定,表明靖边气田气井井筒结垢受井筒腐蚀产物、高矿化度地层水结晶及缓蚀剂吹脱残余重质组分等多因素影响;通过建立井筒结垢程度定量判别方法,评价了不同结垢程度对气井生产影响,提出了靖边气田井筒除垢技术界限.同时,开展了井筒除垢技术研究,优化了除垢药剂性能及除垢工艺,G井现场攻关试验效果显著,表明井筒化学除垢技术适用于靖边气田生产需求.

Corrosive media like H2S (691 mg/m3 on average), CO2 (5%), etc., and high salt water have been carried with the natural gas produced from the Jingbian Gas Field, Ordos Basin, which was put into production in 1997. To master the corrosion law of oil tubings in the gas wells in this field, corrosion inspection has been done of oil tubings without pulling string in more than 60 gas wells, in which wireline operation work was completed by a combination of an multi-arm caliper logging tool, an magnetic testing (MTT) tool, an MID-K electromagnetic flaw detection tool, etc. On this basis, an integrated analysis was performed in combination with many factors such as chloride ion, H2S and CO2 content in the produced gas, water mineralization degree, and water quantity in a gas well, and so forth. The results show that the corrosion phenomenon in oil tubings of gas wells with water production is much severer than that of other gas wells; the higher the water production and water mineralization degree, the severer the corrosion will be; the severest corrosion occurs mainly in the middle and lower parts of production tubings; and the corrosion extends from the outside to inside wall of oil tubings at the strata up above 2000 m, conversely from inside to outside wall at the strata deeper than 2000 m. Accordingly, corrosion prevention and control countermeasures have been taken by adopting a new type of corrosion inhibitor and a new material of inner coating and out spray, and the maximum localized corrosion rate was reduced from 3. 67 mm to 0. 11 mm per year. In this way, normal safe production has been maintained in such gas wells with water production.

Jingbian gas wells generally show its "three low" characteristic, low permeability, low pressure and low yield.With the production of gas to some degree, it will output forma- tion water. Because the lower of the pressure and lower yield of the gas in the gas wells, leading to the decrease of ability to bring the liquid, which coursed gas well can't achieve the produce with self-spread produce.And also affect the late procedure of foam drainage gas.Jingbian gas wells generally contain corrosive gases such as H~S and C02, it will long- term effect the effective implementation of mechanical dewatering technique.So depend on the technique of jingbian gas wells foram drainage gas application and its own production, we carried out a process test on prizing compressor gas lift with foam drainage gas.The re- sults show that this drainage gas technique highly increased the water flooded wells to re- sume production and water wells continuous help drainage. This experiment successfully ex- plore a new drainage gas technique in low pressure and low yield environment.

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.

Supercharging is one of the routine technologies for production improvement during the later stage of gas field development.Jingbian gas field has gone through a rapid pressure decline and some of wells can only be produced discontinuously.Under consideration of these problems and traditional supercharging equipment and methods in the world,this paper discussed and analyzed the technical procedures of compressor application in the gas gathering stations,calculated and predicted such main working parameters as inlet and outlet pressures of the compressor during the production period by pressurizing.In addition,the recognition of two-stage supercharging and compressors being installed between the separator and dehydrator under a constant pressure of the gas gathering system can give guidance to wellsite operations.Supercharged natural gas transportation is to pressurize the natural gas coming from low-pressure gas fields(wells) or being depressurized due to transportation and deliver it to the terminals.Reciprocating compressors,which are frequently used for gas gathering,have advantages of stable discharging pressure,wide range of applicable pressures and flow rate adjustment,high efficiency,high pressure ratio and applicability,etc.In this paper,modifications and adjustments to original procedure because of pressure reduce of the gas flow and increase of the flow rate after supercharging were also analyzed.

The analysis and prediction of the operation situation of natural gas gathering pipeline network can provide references for gas production, gas regulation and pipeline network adjustment. It is introduced the function, characteristics together with the application procedure of FAST Piper in analyzing gas field gathering system. FAST Piper is an optimized software developed by Fekete, a Canadian company, targeting gathering system analysis. The software was used to predict the node pressure of gathering pipeline system, optimize the calculation, simulate the operation situation of pipeline network under abnormal condition instantaneously, analyze looped pipeline network and gas distribution network on the basis of Jingbian Gas Field. The software boasts simplified interface and accurate calculation performance which enables it to deal with various challenges in analyzing the natural gas gathering pipeline network. Moreover, it can also boost work efficiency.

When the No.1 master control valve in the Christmas tree of a high-pressure gas well leaks or cannot be switched on/off, the normal production and maintenance of the gas well will be affected and potential safety hazards may occur, which severely endangers the safety of gas production. This paper introduces the principles, design of the relevant parameters, the tools needed in operation and the operation process of replacement of the No.1 valve in the Christmas tree by running in tubing plugging devices. This technology is characterized by simple operation, well killing-free, no damage to pay zone and low operation cost. Its application in some gas wells in Jingbian gas field has achieved very good effects in recent years.

本文对我公司甲醇回收前处理加药方式进行调整,找出具体加药配比,并且细化加药量.