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Method for determining natural gas flooding injected gas components and natural gas flooding method

An oil displacement method and natural gas technology, which are applied in the fields of earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problems of limited guiding significance, large workload and high cost of natural gas flooding on-site implementation.

Pending Publication Date: 2021-04-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for determining the injected gas components of natural gas flooding, so as to solve the problem that existing numerical simulation methods and experimental methods cannot provide the injection natural gas composition limits for realizing miscible phases, and the guiding significance for natural gas flooding field implementation is limited. And problems such as heavy workload, long period, and high cost, this method can realize the optimization of the composition of injected gas during the field implementation of natural gas flooding

Method used

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  • Method for determining natural gas flooding injected gas components and natural gas flooding method
  • Method for determining natural gas flooding injected gas components and natural gas flooding method
  • Method for determining natural gas flooding injected gas components and natural gas flooding method

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Embodiment 1

[0040] The method for determining the injection gas composition of natural gas flooding in this embodiment is to illustrate the optimization of the injection gas composition of W block natural gas flooding in a certain oil field. The flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0041] 1) Determination of formation pressure and formation temperature: Through the formation temperature and pressure test, it is determined that the formation pressure P of Block W is 26MPa, and the formation temperature t is 140°C. (Note: According to the conversion relationship between Celsius and Fahrenheit: Fahrenheit=1.8×Celsius+32, converted to Fahrenheit is 284℉)

[0042] 2) Determine the crude oil composition and C 7+ average molar mass of .

[0043] 2.1 Use the downhole sampler to extract formation crude oil samples in the wellbore separator of the production well.

[0044] 2.2 Using the extracted formation crude oil samples, determine the C in the form...

Embodiment 2

[0065] The natural gas flooding method of the present embodiment is identical with the block of embodiment 1 (W block actual application), and the mode of referring to embodiment 1 step 1)-step 4) is determined as figure 2 For the injection gas composition conditions shown, the curve in the figure can be regarded as the limit of natural gas composition for miscible flooding. In the actual gas injection process on site, the injected natural gas figure 2 The composition of natural gas injected by miscible flooding on the right side of the curve, referring to the actual situation of the gas source, the actual gas injection composition is controlled as: 41-45mol%, It is 33-38 g / mol. During the development process, gas channeling was slow, showing obvious miscible characteristics, and the on-site oil increase effect was obvious, with a cumulative oil increase of 32,000 tons.

[0066] 3. Comparative example

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Abstract

The invention relates to a method for determining natural gas flooding injected gas components and a natural gas flooding method. According to the method, fitting is carried out by utilizing related experimental data of a block on which a natural gas flooding minimum miscible pressure experiment is carried out; the relationship between the natural gas flooding injected gas components and the natural gas flooding minimum miscible pressure as well as the relationship between the natural gas flooding injected gas components and formation oil components are determined; and according to the formation oil components and the current formation temperature and formation pressure of the target block, injected gas component conditions for realizing miscible flooding are determined. The method has the characteristics of rapidness, economy and accuracy, the influence rule of the injected natural gas components on the miscible capacity of natural gas and crude oil is fully considered, the optimal injected natural gas components obtained through optimization can ensure that the target block can achieve miscible flooding under the current formation pressure and temperature conditions, and the project can achieve the optimal flooding effect.

Description

technical field [0001] The invention belongs to the field of natural gas flooding, and in particular relates to a method for determining the injected gas components of natural gas flooding and a natural gas flooding method. Background technique [0002] Natural gas flooding has the advantages of not being limited by reservoir temperature and salinity, abundant gas sources, no damage to reservoirs, no corrosion to pipe strings, simple post-treatment, and significant increase in recovery. One of the most promising methods in the field of yield. At the same time, natural gas injection miscible flooding generally has higher recovery than immiscible flooding. The composition of injected natural gas is an important parameter affecting the miscibility of natural gas flooding. Therefore, how to accurately optimize the composition of injected natural gas is a key factor in determining the development effect of natural gas flooding projects. [0003] At present, there are mainly re...

Claims

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Application Information

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IPC IPC(8): E21B43/16
CPCE21B43/168Y02A10/40
Inventor 丁妍熊运斌陈宗林戴厚柱盛卫华刘云华郑晶晶唐灵英
Owner CHINA PETROLEUM & CHEM CORP