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Device and method for evaluating flow conductivity of acid-etched fracture of tight reservoir core

A technology for tight reservoirs and conductivity, which can be used in measuring devices, analysis of suspensions and porous materials, instruments, etc., and can solve problems such as inability to simulate natural fractures in formations

Pending Publication Date: 2020-08-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN 101864949 A discloses a test device and method for simulating the conductivity of acid-etched fractures. It uses a method of clamping two rock core plates. This method allows acid to pass through both ends of the rock core smoothly, but the two The gaps between parallel cores cannot simulate the natural fractures produced by the stress of the formation during fracturing

Method used

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  • Device and method for evaluating flow conductivity of acid-etched fracture of tight reservoir core
  • Device and method for evaluating flow conductivity of acid-etched fracture of tight reservoir core
  • Device and method for evaluating flow conductivity of acid-etched fracture of tight reservoir core

Examples

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Embodiment 1

[0064] This embodiment provides a device for evaluating the conductivity of acid-etched fractures in tight reservoir cores. The schematic diagram of its structure is as follows: figure 1 shown, from figure 1 As can be seen, the device consists of:

[0065] Constant flow pump 1, pure water storage tank 2, first intermediate container 5a, second intermediate container 5b, core holder 7, measuring cylinder 13 and ring pressure pump 10;

[0066] The core holder is used to contain the tight reservoir core 9;

[0067] The pure water storage tank is connected to the inlet of the constant-flow pump through a pipeline, and the outlet of the constant-flow pump is connected to the inlet of the first intermediate container and the second intermediate container through the pipeline through the first six-way valve 4a;

[0068] The outlet of the first intermediate container is connected with the outlet of the core holder through a pipeline;

[0069] The outlet of the second intermediate c...

Embodiment 2

[0075] This embodiment provides a device for evaluating the conductivity of acid-etched fractures in tight reservoir cores, wherein the device includes:

[0076] Constant flow pump 1, pure water storage tank 2, first intermediate container 5a, second intermediate container 5b, third intermediate container, core holder 7, measuring cylinder 13 and ring pressure pump 10;

[0077] The core holder is used to contain the tight reservoir core 9;

[0078] The pure water storage tank is connected to the inlet of the constant-flow pump through a pipeline, and the outlet of the constant-flow pump is respectively connected to the first intermediate container, the second intermediate container and the third intermediate container through the pipeline through the first six-way valve 4a. The entrance is connected;

[0079] The outlet of the first intermediate container is connected with the outlet of the core holder through a pipeline;

[0080] The outlets of the second intermediate conta...

Embodiment 3

[0086] This embodiment provides a method for evaluating the flow conductivity of acid-etched fractures of tight carbonate reservoir cores by hydrochloric acid, wherein the method utilizes the flow conductivity of acid-etched fractures of tight reservoir cores provided in Example 1 or Example 2 A capability evaluation device is carried out, which includes the following steps:

[0087] A core cutter was used to process the tight carbonate reservoir core into a cylindrical shape with a diameter of 2.5 cm and a length of 5.0 cm.

[0088] Simulate fracturing (a core fracture machine can be used) to generate artificial fractures on the cylindrical core, then use polytetrafluoroethylene tape 8 to wrap the core, and put it into the core holder.

[0089] Connect the reverse drive line, inject a certain amount of saturated brine (simulated formation water) into the first intermediate container, start the advection pump, and inject pure water into the core at a speed of 10mL / min instead ...

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Abstract

The invention provides a device and method for evaluating the flow conductivity of an acid-etched fracture of a tight reservoir core. The method comprises the steps of simulating fracturing to enablethe tight reservoir core to generate an artificial fracture, winding the core with a polytetrafluoroethylene adhesive tape, and putting the core into a core holder; injecting a certain amount of saturated salt water into a first intermediate container, starting a constant flow pump to replace the saturated salt water with purified water to be injected into the core, recording the injection pressure and the liquid discharge capacity, and calculating the permeability of the core before acidification; injecting a certain amount of acid liquid into a second intermediate container, starting the constant flow pump to replace the acid liquid with purified water to be injected into the core, recording the injection pressure and the liquid discharge capacity, and calculating the permeability of thecore during acidification; injecting a certain amount of saturated salt water into the first intermediate container, starting the constant flow pump to replace the saturated salt water with purifiedwater to be injected into the core, recording the injection pressure and the liquid discharge capacity, and calculating the permeability of the rock core after acidification; and evaluating the flow conductivity of the acid-etched fracture of the core according to the permeability change of the core at different stages.

Description

technical field [0001] The invention relates to a device and method for evaluating the conductivity of acid-etched fractures in tight reservoir cores, and belongs to the technical field of oil and gas exploitation. Background technique [0002] Acidizing is an effective method to increase the production of oil and gas wells or the injection of water injection wells. It is to inject one or several acid liquids or acid mixed liquids into the formation through the borehole, and use the chemical reaction between the acid and some minerals in the formation to dissolve the connected pores or natural (hydraulic) fracture wall rocks in the reservoir, increasing the pores, The flow capacity of fractures is a technical measure to increase the production of oil and gas wells or increase the injection of water injection wells. At present, the conventional acid-etching fracture conductivity evaluation test uses a core acidizing flow tester to test. [0003] For tight reservoirs, which ...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 吴志俊徐乐张子明李超包放曾双红李玉印苏建张文昌郭琳李霞关伟周坤张伟丁超郑亮
Owner PETROCHINA CO LTD