Method for determining increase range of conglomeratic oil pool polymer flooding injection pressure

A technology for determining injection pressure and methods, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc. It can solve the problems that the pressure increase cannot be accurately predicted, and achieve the effects of clear principle, easy use, and improved timeliness

Active Publication Date: 2016-11-23
PETROCHINA CO LTD
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Problems solved by technology

[0007] In view of the above-mentioned technical problems, the purpose of the present invention is to provide a method for determining the increase in injection pressure of polymer flooding in conglomerate reservoirs, so as to solve the problem of the inabi

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  • Method for determining increase range of conglomeratic oil pool polymer flooding injection pressure
  • Method for determining increase range of conglomeratic oil pool polymer flooding injection pressure
  • Method for determining increase range of conglomeratic oil pool polymer flooding injection pressure

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Embodiment Construction

[0024] This example takes the polymer flooding test in the Qidong 1 area of ​​Xinjiang Karamay Oilfield as an example. The polymer solution was injected in September 2006 and ended in October 2012. Using the method in this example to determine the maximum pressure increase and guide the optimization of polymer injection parameters, The development effect of polymer flooding is better. The accumulative increase in production in the test area was 174,000 tons, and the staged recovery rate was 9.0%. Compared with the end of water flooding, the water cut decreased from 94.5% to 67.5%, and the oil recovery rate increased from 0.5% to 3.9%.

[0025] In this embodiment, a method for determining the increase in injection pressure of polymer flooding in a conglomerate reservoir includes the following steps:

[0026] (a) Acquisition of polymer injection well group oil layer thickness h, injection-production well spacing r, wellbore radius r w , injection viscosity μ and injection speed...

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Abstract

The invention provides a method for determining an increase range of the conglomeratic oil pool polymer flooding injection pressure. The method comprises the following steps of a, collecting the reservoir thickness h, the injector producer distance r, the wellbore radius rw, the polymer injection viscosity mu and the injection speed q of a polymer injection well group; b, calculating the average permeability k which is an average value of the permeability ki of an injection well and a production well of the polymer injection well group; c, calculating an average heterogeneity coefficient of permeability Tk which is an average value of the heterogeneity coefficient of permeability of the injection well and the production well of the polymer injection well group according to the average permeability k obtained in the step a; d, calculating the increase range delta Pmax of the maximum injection pressure. The method for determining the increase range of the conglomeratic oil pool polymer flooding injection pressure is clear in principle, quantified, strong in operability and convenient to use, avoids determining injection parameters through in-site injection test in the present, solves the problem that different well groups of a conglomerate reservoir use different injection parameters, greatly improves efficiency and saves cost.

Description

technical field [0001] The invention belongs to the technical field of petroleum development reservoir engineering, and in particular relates to a method for determining the increase rate of injection pressure of polymer flooding in conglomerate reservoirs. Background technique [0002] Enhanced oil recovery has become a common concern around the world. With the popularization and application of polymer flooding industrialization, it is undeniable that polymer solution can significantly enhance oil recovery. The basic principle of polymer flooding is to increase the viscosity of the displacement phase, improve the oil-water mobility ratio, and use polymers to reduce the permeability of high-permeability layers in injection wells, thereby expanding the swept volume and improving oil displacement efficiency. Injection pressure calculation is an important part of polymer flooding parameter design, and it is of great significance to rationally formulate polymer flooding process...

Claims

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Application Information

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IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 王晓光聂振荣程宏杰朱桂芳刘文涛周玉辉吕建荣张菁刘宝珍陈丽华汪良毅陈玉琨朱亚婷
Owner PETROCHINA CO LTD
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