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Quantitative determination method for steam huff and puff validity period

A technology for quantitative determination and validity period, which is applied in the directions of surveying, earthwork drilling and mining fluid, etc., and can solve the problem of undiscovered steam huff and puff validity period, etc.

Inactive Publication Date: 2017-05-31
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

At present, no evaluation method for the validity period of steam stimulation has been found

Method used

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  • Quantitative determination method for steam huff and puff validity period

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Embodiment 1

[0032] (1) According to the principle of close proximity, select the object of discrimination

[0033] Selecting a suitable discriminant object is the key to accurately determine the validity period. After the steam is injected, the temperature of the oil layer near the bottom of the thermal recovery well increases significantly. With the production of wells, the bottom hole temperature and oil production gradually decrease. In order to avoid the influence of production pressure difference and thickness, the change of oil production is generally represented by the meter oil production index. Therefore, the discrimination objects can choose the bottom hole temperature and the oil production index per meter. When the temperature or meter oil recovery index drops to the criterion, it is considered that the thermal recovery fails. Considering the regional differences in reservoir physical properties, it is necessary to select cold recovery wells with the same horizon and adjacen...

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Abstract

The invention discloses a quantitative determination method for the steam huff and puff validity period. The determination method comprises the following steps that the bottom hole temperature and the oil recovery index per meter of a thermal recovery well are determined, and a changing curve between the bottom hole temperature as well as the oil recovery index per meter and the time is obtained; according to the bottom hole temperature failure discriminating criterion and the changing curve between the bottom hole temperature and the time, the obtained time is a first thermal recovery effect failure point; according to the oil recovery index per meter failure discriminating criterion and the changing curve between the oil recovery index per meter and the time, the obtained time is a second thermal recovery effect failure point; when the absolute time difference between the first thermal recovery effect failure point and the second thermal recovery effect failure point is no more than 50 days, the middle value of the sum of the first thermal recovery effect failure point and the second thermal recovery effect failure point is the validity period of the thermal recovery well; and when the absolute time difference between the first thermal recovery effect failure point and the second thermal recovery effect failure point is more than 50 days, the second thermal recovery effect failure point is the validity period of the thermal recovery well. The invention provides the quantitative determination method for the steam huff and puff validity period which makes up the blank in the aspect.

Description

technical field [0001] The invention relates to a method for quantitatively measuring the validity period of steam huff and puff, which belongs to the field of thermal recovery and development of heavy oil. Background technique [0002] There are large reserves of heavy oil resources in the sea. For the special heavy oil with a viscosity of formation crude oil greater than 350mPa·s, the development effect of conventional cold recovery is poor. In order to effectively utilize this kind of special heavy oil resources and improve the development effect, a steam stimulation test has been carried out. Steam huff and puff is achieved by injecting steam with a certain degree of dryness, then shutting down the well and simmering the well, and opening the well after a few days to drain liquid and recover oil. Throughput development is cyclical. When the validity period is reached, the next round of throughput operations will be repeated. Accurate evaluation of the thermal recovery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B47/00E21B47/07
CPCE21B43/24E21B47/00E21B47/07
Inventor 郑伟朱国金谭先红李南郑强袁忠超张利军李延杰王泰超贾振
Owner CHINA NAT OFFSHORE OIL CORP
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