Intelligent injection system and injection method for gas well foam drainage and gas production
A foam drainage and gas production technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve doubtful reliability, ignore the improvement of defoamer filling, and different thresholds of oil casing pressure difference, etc. problems, achieve the effects of reducing labor intensity, saving drug costs, and improving drainage efficiency
Active Publication Date: 2022-03-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0005] (1) The oil jacket pressure difference can only reflect the liquid level difference between the oil pipe and the annular space, but cannot truly reflect the amount of liquid accumulation, and is easily affected by the connectivity of the oil pipe and casing, so the oil jacket pressure difference is used as the filling The reliability of the basis is questionable
[0006] (2) In different production stages, the sensitivity of gas production to the influence of effusion is different, and the oil jacket pressure difference threshold corresponding to the timing of filling is different, and it still needs to be manually adjusted regularly based on experience
[0007] (3) Generally, only the improvement of foaming agent filling is considered, while the improvement of defoaming agent filling is ignored
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[0057] In order to make the technical solutions and advantages of the present invention clearer, the exemplary embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only a part of the embodiments of the present invention, and are not exhaustive of all the embodiments. And in the case of no conflict, the embodiments and the features in the embodiments of the present invention can be combined with each other.
[0058] The inventor noticed during the invention that there are three problems in the existing intelligent injection method:
[0059] (1) The oil-casing pressure difference can only reflect the liquid level difference between the oil pipe and the annular space, but cannot truly reflect the amount of liquid accumulation, and is easily affected by the connectivity of the oil pipe and casing.
[0060] (2) In different production stages, the sensitivity of gas pr...
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The present invention proposes an intelligent injection system and injection method for foam liquid drainage and gas production in gas wells. Conveying channel, separator, its inlet is connected to the first conveying channel, and its outlet forms gas collection channel and liquid sampling channel respectively; Defoamer filling channel, which is connected to the inlet of separator; Data collection device, which collects foaming agent The parameter data of the injection channel, the fluid pressure in the oil pipe and casing, the defoamer injection channel, the gas production channel and the liquid production channel; the control device, which receives the data sent by the data acquisition device, and adjusts and controls the foaming agent in time The injection volume of the injection channel and the defoamer injection channel can be used to adjust the gas production per unit time. The injection system directly adjusts the injection timing adaptively according to the change of gas production, so as to increase the production of gas wells.
Description
technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and in particular relates to an intelligent injection system and an injection method for gas well foam liquid drainage and gas production. Background technique [0002] When natural gas wells are exploited in the middle and later stages, liquid accumulation at the bottom of the well will occur due to insufficient liquid carrying capacity, resulting in water flooding and shutdown of gas wells. Foam liquid drainage gas recovery technology is an effective means to remove liquid accumulation in gas wells and maintain stable production of gas wells, and it is the most widely used in various liquid drainage gas recovery processes. [0003] In recent years, with the implementation of digital gas fields, the foam drainage gas production and filling process is developing in the direction of automation and intelligence, and four types of automatic injection methods have been ...
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IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 刘通雷炜张国东朱江黄万书杜洋卢丽倪杰李莉
Owner CHINA PETROLEUM & CHEM CORP