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Production splitting method for commingling production gas well

A technology for multi-layer commingled production and gas wells, which is used in surveying, earthmoving, wellbore/well components, etc. It can solve problems such as high operating costs, large production gaps, and complex calculation processes, achieving sufficient theoretical basis and saving testing. Cost and accurate calculation accuracy

Active Publication Date: 2020-04-10
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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Problems solved by technology

The production profile test can accurately measure the production contribution of the gas well at this moment, but because the production contribution of each layer is different at different times, all gas wells need to be tested regularly, and the operation cost is high; the Kh value split method mainly studies the influence of static parameters on production , it is impossible to consider the change of production contribution over time, and ignore the influence of technology, management, etc., the calculation results are far from the actual production; the numerical simulation method can obtain the contribution of each layer at different times, but the calculation process is complicated and has Multi-solution, poor application effect

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  • Production splitting method for commingling production gas well
  • Production splitting method for commingling production gas well
  • Production splitting method for commingling production gas well

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Embodiment Construction

[0031] The specific experimental example takes well S265 in the southeast of Ordos Basin as an example. This well is a combined production of three layers of Shan 2, Shan 1, and He 8, with a daily gas production of Q sc =2.7610×10 4 m 3 / d, the production pipe string at the pay zone is a casing, the inner diameter of the casing is D=0.1594m, and the absolute roughness of the pipe wall e=0.016×10 -3 m; the bottom vertical depths of the three pay zones are H 3 =2675.0m, H 2 =2620.6m and H 1 =2569.8m, average permeability K 3 =0.15mD, K 2 =0.11mD, K 1 =0.13mD, effective thickness h 3 =15m, h 2 = 5m, h 3 = 10m. Through the high-precision pressure gauge test, the wellbore pressure values ​​at the bottom of the three pay zones are P wf3 =16.128776MPa, P wf2 = 16.077504MPa and P wf1 =16.029593MPa, the wellbore temperature is T 3 =94.60℃、T 2 =93.88℃ and T 1 =93.14℃, the relative density of natural gas γ g = 0.5871.

[0032] The specific implementation process of the production splittin...

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Abstract

The invention relates to the technical field of oil and gas field development, in particular to a production splitting method for a commingling production gas well. The production splitting method forthe commingling production gas well comprises the following processes that (1) splitting is conducted according to the gas production rate Q<sc> and a Kh value in a standard state of the gas well toobtain a gas production rate initial value of a production layer j; (2) the sum of the gas volumetric flow rate of the production layer j and a production layer n in the standard state is obtained; (3) a Reynolds number initial value Re<j>(0) and a friction factor initial value f<j>(0) under a gas flow velocity initial value v<j>(0) is calculated; (4) the sum of the gas volumetric flow rate of theproduction layer j and the production layer n in the standard state is calculated; and (5) the production of the production layer j is calculated, and error judgment is conducted. According to the production splitting method, production splitting is conducted according to actual wellbore pressure data and a gas well tube flow equation, thus the theoretical basis is more sufficient, and the calculation precision is more accurate.

Description

Technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a production splitting method for a multi-layer combined gas production well. Background technique [0002] In order to increase the production of a single well, many gas reservoirs adopt multi-layer combined production. The production of each layer is the theoretical basis for the study of the remaining gas distribution in the gas reservoir. The contribution of different gas production and different layers of gas wells is also different. Production splitting has always been a difficult point in gas reservoir dynamic analysis. [0003] At present, the commonly used methods of output splitting include output profile test, Kh value splitting method, numerical simulation method, etc. The production profile test can accurately measure the production contribution of a gas well at that moment, but due to the different production contributions of each layer at different ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/00G06F30/20
CPCE21B49/00E21B47/00Y02P90/30
Inventor 辛翠平张磊乔向阳王永科白慧芳杜永慧刘喜祥徐云林孙德瑞
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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