Method for compiling top surface temperature contour map of oil region heat reservoir

A contour map and thermal reservoir technology, applied in buildings and other directions, can solve the problems of limited number of well points for temperature measurement, low reliability of reservoir geothermal distribution map, etc., and achieve high-precision results

Inactive Publication Date: 2019-05-14
HENAN POLYTECHNIC UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

In oilfield drilling data, there are generally temperature-measuring materials for some well points, which can read the temperature of the target layer at the well point. However, the number of well points for temperature measurement is limited, and most of them are distributed in high parts of the structure. The temperature between well points It is greatly affected by the position of the structural belt, so the reliability of the geothermal distribution map of the reservoir obtained simply by reading the temperature at the well point and using Kriging interpolation between the wells is relatively low

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  • Method for compiling top surface temperature contour map of oil region heat reservoir
  • Method for compiling top surface temperature contour map of oil region heat reservoir
  • Method for compiling top surface temperature contour map of oil region heat reservoir

Examples

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Embodiment 1

[0025] Example 1: See Figure 1-5 , a method for compiling a temperature contour map of the top surface of a thermal reservoir in an oil area, the specific process is as follows: Step A, collecting continuous temperature measurement data at existing well points in the oil field, observing the variation law of the well point temperature with depth, and calculating the temperature of the well point Geothermal gradients corresponding to different depth sections; step B, take the geothermal gradient of the temperature measurement well point as the control point, and use Kriging interpolation method between wells to draw the geothermal gradient distribution map of different depth sections; step C, collect the top surface structure of the target layer At the same time, the top structural map and the geothermal gradient contour map are divided into units, and the unit positions and control ranges corresponding to the two sets of maps are completely consistent; the geothermal gradient ...

Embodiment 2

[0030] Embodiment 2, on the basis of embodiment 1, figure 2 It is the continuous temperature measurement data of 9 wells in Dongpu Sag in the embodiment of the present invention. A total of 17 wells in the depression have continuous temperature measurement data, and some well points have oil test temperature measurement data, which can be used as a supplement for temperature control well points. Observing the continuous temperature measurement curve of the well points, it can be found that the temperature of the well points in the depth range of 0-3000m changes uniformly with the depth, and the geothermal gradient of a single well point does not change much. The 17 wells are all divided into 0-3000m, 3000-4300m, 4300m, with three well sections as the geothermal gradient of the well point. The geothermal gradient G in the well section satisfies: G=100*(T 1 -T 0 ) / (H 1 -H 0 ), where H 1 、H 0 is the depth, T 1 , T 0 The temperature corresponding to the corresponding dept...

Embodiment 3

[0031] Example 3: image 3 It is the 0-3000m geothermal gradient contour and geothermal unit division map of the basin according to the embodiment of the present invention. As mentioned above, the geothermal temperature at the 0-3000m well point varies uniformly with depth, that is, the geothermal gradient in the well interval is stable, and interwell interpolation is not affected by structural fluctuations. Therefore, the geothermal gradient distribution map of the well point can be obtained through Kriging interpolation. Specific steps are as follows:

[0032] (1) Divide the geothermal gradient map into relatively uniform grids, and 141 nodes of the grid can be used as virtual wells;

[0033] (2) Import the contour map of the geothermal gradient into Surfer software, select two well points with coordinates, use the plane coordinates as the control, create a posted map, and align the corresponding well points with the contour map of the geothermal gradient, and the geotherma...

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Abstract

The invention discloses a method for compiling a top surface temperature contour map of an oil region heat reservoir, comprising the following steps of: A, collecting well point continuous temperaturemeasurement data, and calculating a ground temperature gradient in sections; B, with a known well point as a control condition, obtaining a ground temperature gradient contour map corresponding to adepth section of the heat reservoir between wells through a Kriging interpolation method; C, dividing a structure map and the geotherm gradient contour map into geotherm calculation units which are completely matched with each other; and D, taking virtual wells and actual drilling data as control points according to the structure map and a ground temperature gradient distribution map unit, and obtaining a ground temperature contour map of the top surface of the heat reservoir through interpolation between the wells. According to the method, the ground temperature gradient contour map is firstly compiled in a segmented mode, then the temperature of the control point is calculated, and the ground temperature contour map is compiled, so that deviation caused by structural fluctuation during direct interpolation is avoided. Unit nodes serve as virtual wells and are evenly distributed in a whole basin, and inconvenience brought to temperature contour map compiling due to the fact that oil and gas drilling wells are mainly concentrated at a high construction position is avoided.

Description

technical field [0001] The invention relates to the field of geothermal development in an oil area, in particular to a method for compiling a temperature contour map of a thermal reservoir top surface in an oil area. Background technique [0002] Most of the oil fields in eastern China have entered the middle and late stages of development, and some abandoned oil and water wells can be used for geothermal development. As a kind of clean energy, geothermal energy can be applied in cascades according to the temperature of groundwater, and can be used in power generation, heating, breeding and other fields respectively. [0003] Using abandoned oil and gas fields to develop geothermal has unique advantages. Abandoned oil and gas wells can be used as hot water wells, reducing the cost of geothermal development, avoiding waste of resources and bringing environmental benefits. Xiong County, Hebei, where geothermal development has been successfully developed, basically has the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/07
Inventor 冯阵东史淑珍魏国营闫江伟贾天让刘擎李宝林孙绍栋
Owner HENAN POLYTECHNIC UNIV
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