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Target reservoir well test analysis method, computer storage medium and computer equipment

A technology of target reservoir and analysis method, applied in the field of well test analysis of fractured-cavity carbonate reservoir target reservoir, computer storage medium and computer equipment, can solve the well test model and method of carbonate reservoir It cannot be applied to problems such as carbonate reservoirs, so as to ensure efficient development, good adaptability, and improve economic benefits.

Pending Publication Date: 2021-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing carbonate reservoir well testing models and methods cannot be applied to carbonate reservoirs with vertically distributed caves and fractures

Method used

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  • Target reservoir well test analysis method, computer storage medium and computer equipment
  • Target reservoir well test analysis method, computer storage medium and computer equipment
  • Target reservoir well test analysis method, computer storage medium and computer equipment

Examples

Experimental program
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Embodiment 1

[0039] In order to solve the above-mentioned technical problems existing in the prior art, the present invention provides a kind of target reservoir well test analysis method, figure 1 A flow chart of the target reservoir well testing analysis method of the present invention is shown.

[0040] refer to figure 1 , the target reservoir well testing analysis method of this embodiment includes the following steps:

[0041] Step 1. Establish a well test analysis model according to the geological characteristics of caves, fractures and bedrock in the target reservoir;

[0042] The well test analysis model includes a cylindrical karst cave sub-model, a first fracture zone sub-model, a second fracture zone sub-model and a wellbore sub-model;

[0043] The first fracture zone sub-model is set to be located above the upper boundary of the cylindrical karst cave sub-model and distributed vertically, for connecting the cylindrical karst cave sub-model and the wellbore sub-model;

[0044...

Embodiment 2

[0054] In order to better illustrate the technical solution of the present invention, the present embodiment further illustrates the target reservoir test analysis method of the present invention:

[0055] The target reservoir well test analysis method of this embodiment includes the following steps:

[0056] Step 1. Establish a well test analysis model according to the geological characteristics of caves, fractures and bedrock in the target reservoir.

[0057] refer to figure 2 , the well test analysis model described in step 1 includes a cylindrical karst cave sub-model, a first fracture zone sub-model, a second fracture zone sub-model and a wellbore sub-model; wherein:

[0058] The first fracture zone sub-model is set to be located above the upper boundary of the cylindrical karst cave sub-model and distributed vertically, for connecting the cylindrical karst cave sub-model and the wellbore sub-model;

[0059] The second fracture zone sub-model is set to be located below...

Embodiment 3

[0166] Here, step 4 in the second embodiment is further described in detail with an example.

[0167] refer to image 3 , taking a well in a certain carbonate reservoir as an example, there is a cave at a distance of 50 meters from the bottom of the well. The hypertonic strip supplies liquid to the cave, and the permeability of the hypertonic strip is 1000md. Simulate the pressure recovery of the well, and obtain the double-logarithmic curve of the pressure difference and pressure difference derivative during the pressure recovery process, namely image 3 ,From image 3 It can be seen from the figure that the carbonate oil wells where the bottom reservoir supplies liquid to the cave show six flow regimes, which are the wellbore storage section, the skin section, the linear flow section, the transition flow section, the cave storage section and the boundary flow section.

[0168] It should be noted:

[0169] Flow state 1 is the wellbore storage section, which is characteriz...

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Abstract

The invention discloses a target reservoir well test analysis method, a computer storage medium and computer equipment. The method comprises the steps that a well test analysis model is built according to the geological features of a karst cave, a crack and a bed rock in a target reservoir; a well bottom pressure solution in a real space is calculated according to the well test analysis model, wherein the well bottom pressure solution is the relationship between the well bottom pressure and time; a model curve is drawn according to the well bottom pressure solution, and the model curve comprises a pressure curve and a pressure derivative curve; and the liquid supply features of the target reservoir are judged according to the model curve. According to the target reservoir well test analysis method, the computer storage medium and the computer equipment, vertical fluid flow in the karst cave and the vertical liquid supply features of a deep stratum are reflected, a basis is provided fordetermining accurate and reliable karst cave volume, high-permeability zone flow capacity and geological reserves of the fracture-cave carbonate reservoir, basic information is provided for dynamic evaluation of the reservoir, and the method plays an important role in guaranteeing efficient development of the fracture-carve carbonate reservoir and improving economic benefits.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration, and in particular relates to a well test analysis method for a target reservoir of a fracture-cavity carbonate rock reservoir, a corresponding computer storage medium and computer equipment. Background technique [0002] Carbonate reservoirs occupy an important position in the world's discovered reservoirs. The discovery of Tahe Oilfield in China is a new major breakthrough in carbonate reservoirs, and it has opened a new stage of exploration and development of carbonate reservoirs in my country. The main body of Tahe Oilfield is Ordovician carbonate rock fracture-cave reservoir, the main reservoir type is fracture-cavity reservoir, which is the result of multi-stage karst reformation, and the reservoir space mainly includes karst caves, pores, fractures, etc. , the combination of these obviously different reservoir spaces forms dissolved-vug, fracture-cavity, fracture, and cave-typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B43/26G06F30/28G06F111/10G06F113/08G06F119/14
CPCE21B49/00E21B43/26
Inventor 庞伟杜娟毛军张同义吴琼邸德家艾爽
Owner CHINA PETROLEUM & CHEM CORP
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