Method for determining the major and minor semi-axes of elliptical drainage regions in horizontal wells in tight oil and gas reservoirs

A technology for determining the drainage area and method, which is applied in the field of determining the length and semi-minor axis of the elliptical drainage area of ​​horizontal wells in tight oil and gas reservoirs, and can solve problems such as the inability to calculate the length of the elliptical drainage area and the length of the semi-semi-minor axis , to achieve the effect of accurate theoretical basis

Inactive Publication Date: 2021-02-19
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of the horizontal well section, the shape of the drainage area changes from a circle to an ellipse. Therefore, the existing method cannot calculate the long and short semi-axis lengths of the real elliptical drainage area.

Method used

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  • Method for determining the major and minor semi-axes of elliptical drainage regions in horizontal wells in tight oil and gas reservoirs
  • Method for determining the major and minor semi-axes of elliptical drainage regions in horizontal wells in tight oil and gas reservoirs
  • Method for determining the major and minor semi-axes of elliptical drainage regions in horizontal wells in tight oil and gas reservoirs

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Effect test

Embodiment 1

[0096] The CGHE365 horizontal well is located in the well area K of Shinan 31 well of Shixi oil production plant in the tower 18-tower 131 well area 1q1 Layer, oil production well, horizontal section length is 600m, 2012 / 07 / 14 for 2646.44-2649.24 layer section for well test interpretation, choose infinite large homogeneous reservoir fixed well storage horizontal well model. The method of the invention is used to obtain the relevant parameters of the elliptical drainage area of ​​the horizontal well.

[0097] Table 1 utilizes the present invention to determine CGHE365 horizontal well oil well related parameters

[0098]

Embodiment 2

[0100] The Ordos FD27 horizontal well was put into production on December 26, 2007. The pressure recovery test carried out on July 05, 2012 was selected to test the reservoir at a depth of 2867.85m, the depth of the instrument was 2600m, and the length of the horizontal well section L was 98200cm. Horizontal permeability k is 0.0353mD, formation comprehensive compressibility C t 0.0032atm -1 , the effective thickness h of the gas reservoir is 800cm, the formation porosity φ is 8.5%, and the fluid viscosity μ is 0.019mPa·s. Utilize the horizontal well determined by the method of the present invention to reach the start time t of late pseudo-stable flow pss , calculate the long and short semi-axes of the elliptical drainage area of ​​the horizontal well as shown in Table 2.

[0101] Table 2 utilizes the present invention to determine Ordos FD27 horizontal well related parameters

[0102]

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Abstract

The invention discloses a method for determining the long and short semi-axes of the elliptical discharge area of ​​a horizontal well in tight oil and gas reservoirs, comprising the following steps: collecting basic parameters of the oil and gas reservoir, obtaining a well test double-logarithmic curve through a well test method, and obtaining The double-logarithmic curve can obtain the end time of medium-term linear flow and the time when formation fluid reaches quasi-stable flow; The flow time of the horizontal well section, and finally calculate the semi-minor axis of the elliptical drainage area of ​​the horizontal well and the semi-major axis of the elliptical drainage area of ​​the horizontal well by the following formula. The invention uses the well testing method to truly and reliably reflect the flow characteristics of the formation fluid, calculate the long and short semi-axes of the elliptical drainage area accurately, and provide better and more accurate theoretical basis for the development and production of tight oil and gas reservoirs.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration and development, in particular to a method for determining the long and short semi-axes of an elliptical discharge area of ​​a horizontal well in tight oil and gas reservoirs. Background technique [0002] In today's world, with the advancement of science and technology society and the development of human society, people's demand for oil and gas resources is increasing day by day. The development of conventional oil and gas reservoirs gradually cannot satisfy people's desire for oil and gas resources, and tight oil and gas reservoirs gradually appear in people's field of vision. According to relevant statistics, the global tight oil resources are about 6900×10 8 t, is more than 2.5 times that of conventional oil resources, and the global recoverable reserves of tight gas are about 428×10 12 m 3 . my country also has a large amount of tight oil and gas resources. my country has a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/00G06Q50/02
CPCE21B47/00G06Q50/02
Inventor 聂仁仕周杰邓祺欧进晶周贤宗陈天齐
Owner SOUTHWEST PETROLEUM UNIV
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