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A Method for Predicting the Recovery Factor of Air Foam Flooding in Reservoirs

An air-foam flooding and recovery technology, which is applied in prediction, fluid extraction, earthwork drilling, etc., can solve the problems of long time consumption, large difference and high required cost, and achieves low workload, feasibility and feasibility. Manipulative, easy-to-obtain results

Active Publication Date: 2021-05-11
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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Problems solved by technology

The physical experiment method simulates the reservoir and fluid conditions, conducts indoor core displacement experiments, and calculates and predicts the recovery rate based on the experimental data, which takes a long time and requires high costs, and usually only one-dimensional displacement is obtained from indoor physical experiments The recovery factor, that is, the oil displacement efficiency, is quite different from the recovery factor in the case of actual reservoir displacement with sweep coefficient
The numerical simulation method first needs to establish a fine and accurate geological model of the reservoir, and predict the recovery rate on the basis of a good fit with the historical production data. The processing workload is very large, and it also takes a long time

Method used

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  • A Method for Predicting the Recovery Factor of Air Foam Flooding in Reservoirs
  • A Method for Predicting the Recovery Factor of Air Foam Flooding in Reservoirs
  • A Method for Predicting the Recovery Factor of Air Foam Flooding in Reservoirs

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Embodiment 1

[0226] The actual production data of the oil field is used to verify the method for predicting the recovery factor of air foam flooding in the reservoir:

[0227] Tang 80 well area is located in Ganguyi Town, Yan'an City, Northern Shaanxi. The main oil-bearing formation is the Chang 6 oil layer group of the Triassic Yanchang Formation. The average buried depth of the oil reservoir is 441 meters, the average porosity is 7.9%, and the average permeability is 0.82×10 -3 μm 2 , the original formation pressure coefficient is 0.95, and the reservoir temperature is 26-30°C, belonging to ultra-low permeability, low-pressure, low-temperature lithologic reservoirs. After reservoir screening and analysis, it was decided to carry out field tests of air foam flooding in this area. Before the field test, a large number of indoor tests and evaluation studies were carried out for this area, and relatively comprehensive parameter information was obtained, see Table 1 for details.

[0228] Ta...

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Abstract

The invention belongs to the technical field of oil field development, and in particular relates to a calculation method for predicting the oil reservoir air foam flooding recovery rate. A method for predicting the recovery factor of air foam flooding in a reservoir, including the following steps: (1) Assume that the injected fluid will gradually form three regions in the formation, namely the foam region, liquid region and gas region, and the displacement stage It is divided into before gas breakthrough and after gas breakthrough, and it is judged that the current stage belongs to a certain stage of displacement stage; (2) To determine whether the current stage is before gas breakthrough or after gas breakthrough, calculate the foam area, liquid phase area and gas phase area respectively. The displacement efficiency and sweep coefficient of the area at the current stage. (3) Recovery factor R = displacement efficiency × sweep coefficient. The invention divides the displacement fluid in the oil reservoir into three regions, and then calculates the sweep coefficient and oil displacement efficiency of each region respectively, finally obtains the recovery factor of the air foam flooding, and has strong feasibility and operability.

Description

technical field [0001] The invention belongs to the technical field of oil field development, and in particular relates to a calculation method for predicting the oil reservoir air foam flooding recovery rate. Background technique [0002] Reservoir recovery factor is an important evaluation index in oilfield development. The oil recovery prediction can evaluate the recovery effect of the reservoir under different driving modes and calculate its recoverable reserves, which is of great significance for oilfield development planning and scheme deployment. According to the experience of a large number of oil reservoir development at home and abroad, there are many factors affecting the oil recovery rate of the oil reservoir. In addition to the characteristics of the oil reservoir, natural energy, formation fluid properties, well pattern type and other factors, it is also related to the development mode and driving type. closely related. [0003] Air foam flooding, as an effec...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04G06F30/28E21B43/16
CPCE21B43/16G06F30/20
Inventor 尚庆华赵习森王玉霞江绍静杨永超黄春霞张冠华陈龙龙张建成
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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