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Fracture-containing tight reservoir air gravity drive potential evaluation experiment method and device

A technology of tight oil reservoirs and experimental methods, which is applied in the field of experimental methods and devices for evaluating the potential of air gravity flooding in tight oil reservoirs with fractures, and can solve the problems of inability to accurately evaluate the development potential of air gravity flooding, matrix failure, gas or water, etc. Going over and other issues

Pending Publication Date: 2020-07-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing research on the evaluation of displacement potential of fractured reservoirs mainly adopts the method of conventional water flooding or gas flooding. During conventional displacement, gas or water is easy to pass through the fractures, and the "gas fingering phenomenon" occurs , the oil in the matrix is ​​less or not driven
The potential evaluation experiment of conventional flooding in fractured tight oil reservoirs cannot accurately evaluate the development potential of air gravity flooding of the reservoir

Method used

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  • Fracture-containing tight reservoir air gravity drive potential evaluation experiment method and device
  • Fracture-containing tight reservoir air gravity drive potential evaluation experiment method and device
  • Fracture-containing tight reservoir air gravity drive potential evaluation experiment method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] This embodiment provides a centrifugal cup.

[0072] The centrifuge cup as Figure 6 As shown, the centrifuge cup includes:

[0073] A cup body 1, the cup body 1 is provided with an accommodating chamber, the opening end of the cup body 1 is provided with an internal thread, and the internal thread is a thread groove 5, and the accommodating chamber is provided with a filter screen 3, and the accommodating chamber Separated by the filter screen 3 into two chambers are the top rock sample chamber 4 and the bottom solvent chamber 2;

[0074] A cover 7, the cover is provided with an external thread that matches the internal thread of the cup, and the cover 7 is provided with a liquid injection hole 6;

[0075] The cover 7 can move along the direction of the top and bottom of the accommodating chamber; move the cover 7 up and down, so that the upper and lower surfaces of the rock core in the centrifugal cup are close to the filter screen 3 and the cover 7, and the rock co...

Embodiment 2

[0077] This embodiment provides a core wrapping sleeve.

[0078] The core package is as Figure 8 As shown, the core wrapper includes: a wrapper main body 10 , a hook and loop 11 , and a rubber band 12 .

[0079] When this rock core wrapping cover is used, utilize sticky tape 11 to adjust the fitting degree of wrapping cover main body 10 and rock core, as Figure 7 As shown, the core 8 is tightly attached to the core wrapping sleeve 9, and is fixed with a rubber band 11 to ensure that the wrapping sleeve will not be thrown off during the centrifugation process.

Embodiment 3

[0081] This example provides a comparison between the experimental method for evaluating the air gravity flooding potential of tight oil reservoirs containing fractures centered on high-speed centrifugal gas flooding and the experimental method for evaluating the air gravity flooding potential of tight oil reservoirs containing fractures centered on ordinary gas flooding.

[0082] In this example, the experimental device for evaluating the air gravity flooding potential of tight oil reservoirs containing fractures, which is based on the high-speed centrifugal gas flooding, is as follows. The apparatus includes Reccore- 04 type rock core nuclear magnetic resonance analyzer, the centrifuge comprising the centrifuge cup described in embodiment 1, the rock core wrapping sleeve described in embodiment 2 and the fracture-developed rock core.

[0083] The specific steps are as follows:

[0084] ① Label the 3 tight cores with developed fractures as No. 1, No. 2 and No. 3, wash with oi...

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Abstract

The invention provides a fracture-containing tight reservoir air gravity drive potential evaluation experiment method and device. The method comprises the following steps that firstly, gasometry of porosity and permeability of a fracture development core is carried out; secondly, after core oil saturation, a T2 spectrum is measured; S3, in air at the oil saturated core, a centrifugal machine is used for carrying out gas drive oil high-speed centrifuging with the centrifugal force sequentially increased, and the core is centrifuged until no oil is output under various kinds of centrifugal force, and after each time of centrifugation, a core T2 spectrum is tested; and fourthly, the T2 spectrum is used for working out gas drive movable fluid percents and total gas drive movable fluid percentscontrolled by different throat intervals, air gravity drive potential is represented, and fracture-containing tight reservoir air gravity drive potential evaluation is finished. The method achieves the aim that in a lab, the fracture development core is used for carrying out fracture-containing tight reservoir air gravity drive potential evaluation for the first time, high-speed centrifugal gas drive is used for simulating air gravity drive, and the basis is provided for air gravity drive development of a strong heterogeneity tight reservoir particularly a fracture development tight reservoir.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir development, in particular to an experimental method and device for evaluating the air gravity flooding potential of tight oil reservoirs with fractures. Background technique [0002] Tight oil reservoirs are widely distributed, and its effective development plays an increasingly prominent strategic role in PetroChina. Tight oil reservoirs have complex pore structure, poor physical properties, small crude oil storage pores, and high fluid seepage resistance, making it difficult to establish an effective displacement system. Air gravity flooding may become an important technical means to enhance the recovery of tight oil. At present, there are some studies on the process research and oil displacement theory of air gravity flooding in low permeability reservoirs. Air gravity flooding utilizes the gravity differentiation effect formed by the oil-gas density difference to move more evenly to th...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B43/22E21B25/00B04B5/00
CPCE21B49/00E21B43/168E21B25/00B04B5/00
Inventor 李海波杨正明郭和坤卢海兵孙玉平周尚文胥洪成张合文
Owner PETROCHINA CO LTD
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