Risk prediction method for fluid accumulation in water-producing gas wells
A technology for risk prediction and gas wells, which is applied in prediction, data processing applications, instruments, etc., and can solve the problems of high price and unfavorable low-cost development of gas fields.
Inactive Publication Date: 2021-01-12
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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[0006] However, judging from the implementation process of the above two methods, they are expensive, which is not conducive to the low-cost development of gas fields
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[0115] 1. Establishment of productivity model of water-producing gas well
[0116] Based on the basic theory of seepage, the productivity model of water-producing gas wells is established, and the productivity equation considering water-producing gas wells is obtained through model derivation and solution. To establish the productivity equation, the following assumptions are made for the conditions of the gas reservoir:
[0117] ①Horizontal uniform and equal thickness infinitely large circular gas-water reservoir with one well in the center;
[0118] ② Air and water are immiscible with each other, and the two phases of air and water, which have no chemical effect, flow at the same time;
[0119] ③ The effects of gravity and capillary force are not considered;
[0120] ④ The well is a perfect well, and the fluid flows radially into the well;
[0121] ⑤ Both rock and fluid are incompressible;
[0122] ⑥Consider gas-water two-phase non-Darcy seepage flow, start pressure gradi...
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The invention discloses a water-production gas well liquid loading risk prediction method. The water-production gas well liquid loading risk prediction method provides a basis for making a waterproof and water control strategy for a liquid-loading risky well in advance, and lays a foundation for a reasonable and effective water-bearing gas reservoir. The water-production gas well liquid loading risk prediction method comprises the steps of: step 1, establishing a productivity model of a water-production gas well, acquiring a productivity equation of the water-production gas well, and predicting productivity; step 2, considering magnitude variations of formation pressure and a water-gas ratio comprehensively, determining a rule that gas production of a gas reservoir changes along with the water-gas ratio and a rule that gas production of the gas reservoir changes along with the formation pressure, adopting a gas well liquid carrying critical flow calculation model, and calculating a critical liquid carrying flow rate of a gas well and regarding the critical liquid carrying flow rate as a gas well liquid loading judgment boundary; step 3, and combining a variation relation between the formation pressure and the water-gas ratio predicted by gas reservoir numerical simulation, acquiring a production variation relation comprehensively considering variations of the formation pressure and the water-gas ratio, further combining the gas well liquid loading judgment boundary, and carrying out liquid-loading risky well prediction analysis.
Description
technical field [0001] The invention relates to the technical field of gas well development, in particular to a method for predicting the risk of liquid accumulation in water-producing gas wells. Background technique [0002] During the development process of gas reservoirs at home and abroad, formation water is produced to varying degrees. If the produced water cannot be discharged from the wellbore of the gas well in time, it will accumulate at the bottom of the gas well, resulting in fluid accumulation. [0003] After the gas well has fluid accumulation, on the one hand, it increases the flow resistance of the gas, reduces the gas well productivity, and in severe cases will cause the gas well to stop production; on the other hand, the long-term fluid accumulation will cause serious pollution to the formation. Therefore, in the process of gas well production, it is an important content of gas field dynamic monitoring to timely detect the position of the liquid level in th...
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IPC IPC(8): G06Q10/04G06Q10/06G06Q50/02
CPCG06Q10/04G06Q10/0635G06Q50/02
Inventor 黄小亮郭肖戚志林严文德肖前华
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY