Alcohol treatment also causes shrinkage of swollen clay,so that the effective permeability of gas may be increased and the production ability of the gas well may be restored.
During the depletion production of condensate gas reservoirs, when pressure is lower than the dew point pressure, condensate phenomenon occurs, the condensate gas is accumulated rapidly in near-wellbore area and is the production capacity of gas wells severely damaged.
The study results show the productivity of gas wells is relative with the location and thickness of the sand body where the gas well lies at. The gas wells that lie within the main sand belt or have big effective thickness possess high productivity and good production stability.
The gas wells that lie in the sides of the main sand belt or have less effective thickness and poor permeability possess low productivity and poor production stability.
Tight gas lormation can be damaged by water invasion in the operation of drilling,completion and stimulation.Alcohol can decrease this damage.The alcohol treatment mechanism is that the invaded water can be removed by decreasing surface tension and forming low boiling point azeotrope.Alcohol treatment also causes shrinkage of swollen clay,so that the effective permeability of gas may be increased and the production ability of the gas well may be restored.A method for studing permeability distribution after core...
Tight gas lormation can be damaged by water invasion in the operation of drilling,completion and stimulation.Alcohol can decrease this damage.The alcohol treatment mechanism is that the invaded water can be removed by decreasing surface tension and forming low boiling point azeotrope.Alcohol treatment also causes shrinkage of swollen clay,so that the effective permeability of gas may be increased and the production ability of the gas well may be restored.A method for studing permeability distribution after core damage is suggested in this paper.The main damage region was found to be in the entrance with 1-3 mm,Because of the decrease of water saturation and the shrinkage of filter film,the effect of fracturing will bo enhanced.Alcohol can be used for decreasing formation damage as a single measure or as pretreatment or post-treatment of other stimulation measures (fracturing and acidizing).
Based on the producing history of more than 20 years in Banqiao condensate gas reservoir,the production properties of the Ban Ⅱ high liquid hydrocarbon condensate gas reservoir in the center area of the reservoir are expounded.Then,by use of the modern reservoir engineering principles and analysis methods and in combination with the new methods,new techniques and new trend of producing the condensate gas reservoirs at home and abroad,the production properties of condensate gas reservoirs are analyzed and discussed...
Based on the producing history of more than 20 years in Banqiao condensate gas reservoir,the production properties of the Ban Ⅱ high liquid hydrocarbon condensate gas reservoir in the center area of the reservoir are expounded.Then,by use of the modern reservoir engineering principles and analysis methods and in combination with the new methods,new techniques and new trend of producing the condensate gas reservoirs at home and abroad,the production properties of condensate gas reservoirs are analyzed and discussed in detail and six production properties of the high liquid hydrocarbon condensate gas reservoirs with oil rims are systematically summarized as follows:①condensate content increases with the increase of the buried depth of structure,being inversely proportional to recovery factor;②the heavy components are firstly lost from condensate in the process of pressure drop production;③the influence of the oil rim and edge water on the productivity of condensate gas well reduces with the reduction of pressure;④depletion type production causes the condensate and crude oil to be lost considerably;⑤oil rim production is of a good effect because of gas cap drive;and ⑥ gas reservoir phase state feature contracts regularly in the process of depletion type development.It is proved through practice that the conclusion is correct and reliable,which provides a feasible on site operation experience for producing the condensate gas reservoirs in China.
Majing gas field is a new gas field.It is found at the end of 1997.It has drilled 15 wells.Industrial gas stream is obtained in 12 wells In the gas field,Mapeng well 3 and Mapeng well 7 produce water,Chuanma well 601 and Mapeng well 2 produce a few condensate,Chuanma well 602 produce a few water and condensate.On the basis of production features and distribution distinguishing features of reservoirs in the gas field,the paper proposes out well position distribution during exploration,introduces reservoir protection...
Majing gas field is a new gas field.It is found at the end of 1997.It has drilled 15 wells.Industrial gas stream is obtained in 12 wells In the gas field,Mapeng well 3 and Mapeng well 7 produce water,Chuanma well 601 and Mapeng well 2 produce a few condensate,Chuanma well 602 produce a few water and condensate.On the basis of production features and distribution distinguishing features of reservoirs in the gas field,the paper proposes out well position distribution during exploration,introduces reservoir protection techniques during drilling,sand fracturing techniques in gas reservoir reforming,and sand control/plugging sand techniques and foam water draining techniques during developing.These development techniques can increase production capacity of gas well and production of gas field.
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