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Shaft interior temperature distribution semi-analytical determination method and device

A technology of temperature distribution and determination method, applied in the direction of buildings, etc., can solve problems such as many required parameters, large temperature difference, and cumbersome solution process.

Active Publication Date: 2014-02-19
PETROCHINA CO LTD
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Problems solved by technology

[0012] The above-mentioned existing method for solving the temperature distribution in the wellbore mainly has the following two problems. One is that many parameters are required, and the solution process is more cumbersome;
In fact, to solve the temperature distribution law in the wellbore, it is only necessary to look at the outside of the wellbore as a whole. At the same time, according to the knowledge of heat transfer, the heat transfer coefficient of an object is a function of temperature, and the temperature in the bottom of the well and the wellhead If the heat transfer coefficient of the entire wellbore is regarded as a constant to calculate the temperature distribution in the wellbore, there will be a large error

Method used

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  • Shaft interior temperature distribution semi-analytical determination method and device
  • Shaft interior temperature distribution semi-analytical determination method and device
  • Shaft interior temperature distribution semi-analytical determination method and device

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Embodiment

[0109] The concrete steps that the technical solution of this embodiment realizes comprises:

[0110] 1) Basic parameters: the depth H, m of the well is obtained from the drilling and completion data; the geothermal gradient m and surface temperature t are obtained from the test data of the well es , °C; the water equivalent W of the produced fluid is obtained from the production data, W / °C; based on the knowledge of heat transfer, the linear relationship between the heat transfer coefficient k between the inside and outside of the tubing and the temperature t is obtained, k=at+b.

[0111] 2) if Figure 4 Shown is the schematic diagram of the section of the production well in the embodiment. Using the idea of ​​nodes, the research system is divided into N sections along the wellbore, with a total of N+1 nodes. Section i, that is, in the interval (h i-1 , h i ), according to the energy balance:

[0112] W i dt i =k i (t i -t ei )dh i (1)

[0113] In the formul...

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Abstract

The invention provides a shaft interior temperature distribution semi-analytical determination method and device. The method includes: dividing a shaft into N segments, with each having interior and exterior heat transfer coefficient which is a constant; obtaining an interior-exterior energy conservation expression of each segment according to the energy conservation principle, and obtaining linear relation between the interior-exterior heat transfer coefficient of each segment and interior temperature of the shaft according to heat transfer theory; obtaining shaft interior temperature distribution segment by segment from bottom to top under the known shaft bottom conditions according to the interior-exterior energy conservation expression of each segment and the linear relation between the heat transfer coefficient and temperature.

Description

technical field [0001] The invention relates to the field of oil and gas reservoir exploitation, in particular to a semi-analytical method and device for determining the temperature distribution in a wellbore by using stratum static data and oil and gas well dynamic data. Background technique [0002] The dissolved gas in crude oil is affected by temperature. During oil production, if the temperature in the wellbore is too low, the gas will be separated from the crude oil. On the one hand, two-phase flow will be formed in the wellbore, which will seriously affect the oil recovery efficiency of the well. The separation of gas and the increase of viscosity of crude oil increase the resistance of fluid flow in the wellbore. Therefore, the distribution of the wellbore temperature field plays a vital role in the study of the flow state of the wellbore fluid and oil production engineering. [0003] 1. The technical solution of prior art 1 [0004] This method comprehensively con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/07
Inventor 傅礼兵赵伦张玉丰范子菲陈礼许必锋
Owner PETROCHINA CO LTD
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