Critical liquid-carrying flow calculation method considering droplet deformation and multi-parameter influence
A liquid-carrying flow rate and calculation method technology, which is applied in the field of reasonable production allocation of gas reservoirs, can solve problems such as deviations in the judgment of liquid accumulation in gas wells, changes in key parameters, and inability to accurately reflect the normal liquid-carrying production capacity of gas wells, etc., so as to achieve convenient reference , Calculate the effect of accurate and convenient
A liquid-carrying flow rate and calculation method technology, which is applied in the field of reasonable production allocation of gas reservoirs, can solve problems such as deviations in the judgment of liquid accumulation in gas wells, changes in key parameters, and inability to accurately reflect the normal liquid-carrying production capacity of gas wells, etc., so as to achieve convenient reference , Calculate the effect of accurate and convenient
CN111400978AActive Publication Date: 2020-07-10SOUTHWEST PETROLEUM UNIV
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[0014] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0015] Such as figure 1 Shown is the flow chart of calculation of the critical liquid-carrying flow of the present invention, and the present invention adopts the following steps:
[0016] Firstly, the physical model of the droplet in the wellbore is established, based on the principle of droplet breakage microscopically, that is, the droplet is kept in an ellipsoidal shape without being broken by surface tension and gas phase turbulent force, and the maximum size parameter of the ellipsoidal droplet is calculated; then, Macroscopically, based on the balance of gravity, drag force and buoyancy...
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The invention relates to a critical liquid-carrying flow calculation method considering droplet deformation and multi-parameter influence in the field of reasonable production allocation of gas reservoirs. The method solves the problem of deviation existing in judgment of gas well effusion at present, and mainly comprises the following steps: solving the maximum size parameter of ellipsoidal liquid drops based on the liquid drop breaking principle; based on the balance of gravity, a drag force and buoyancy borne by the liquid drops, acquiring a critical liquid-carrying flow velocity expression; considering the influence of the change of the incident flow area of the liquid drops due to deformation on drag coefficients and the influence of different pressures, temperatures and pipe diameters on parameters such as gas-liquid two-phase friction resistance, gas-liquid surface tension and the like, and establishing a critical liquid-carrying flow calculation model considering multiple parameters; and finally, solving the model by adopting a multi-parameter iteration mode to obtain the critical liquid-carrying flow of the gas well. The method has the advantages that the gas well effusionis accurately predicted, the influence of multiple parameters on the critical liquid carrying flow is considered, calculation is accurate, and use is convenient.
Description
technical field [0001] The patent of the present invention relates to a calculation method of critical liquid-carrying flow considering the influence of droplet deformation and multi-parameters, which belongs to the field of reasonable production allocation of gas reservoirs. Background technique [0002] Since most gas fields adopt depletion mining, as the production progresses, the formation energy decreases, which is not enough to bring out all the liquid produced in the wellbore, and the liquid accumulates at the bottom of the well, creating back pressure on the formation, further reducing the effective liquid-carrying energy. In severe cases, it may even cause well killing or gas well shutdown, which is the phenomenon of liquid accumulation in gas wells. Therefore, based on the principle of liquid carrying in gas wells, it is of great significance to study the calculation of critical liquid carrying flow rate, provide reference for reasonable production allocation of ga...
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Patent Timeline
10 Jul 2020
Publication
CN111400978A
- IPC
- G06F30/33; G06F119/14
- Inventors
- 肖衡; 李晓平