CN219475332U

CN219475332U - Carbonate rock core acidizing corrosion experimental device

Info

Publication number: CN219475332U
Application number: CN202320511687.XU
Authority: CN
Inventors: 程康康; 李鹏飞; 于莎莎
Original assignee: Shandong Obiton Petroleum Technology Co ltd
Current assignee: Shandong Obiton Petroleum Technology Co ltd
Priority date: 2023-03-16
Filing date: 2023-03-16
Publication date: 2023-08-04
Anticipated expiration: 2033-03-16

Abstract

The utility model relates to an experimental device for acidizing and corrosion of a carbonate rock core. The technical proposal is as follows: a rubber cylinder is arranged in the core holder, a stop plunger, a carbonate core and a plunger device are arranged in the inner cavity of the rubber cylinder, one end of the carbonate core is provided with the stop plunger, and the other end is provided with the plunger device; the right end of the core holder is connected with a liquid discharge valve and a back pressure device through an outlet pipeline, the middle part of the core holder is connected with a surrounding pressure pump through a pipeline, the left end of the core holder is connected with a advection displacement pump through an inlet pipeline, and a core inlet end pressure sensor and a pH value display table are arranged on the inlet pipeline. The beneficial effects are that: the confining pressure interface of the core holder is connected through the confining pressure pump; and regulating the back pressure between 0.1 and 10 Mpa by a back pressure device, establishing a relation between the speed and the breakthrough volume in a laboratory, establishing a relation between the concentration and the breakthrough volume, and establishing a relation between the acid liquor type and the breakthrough volume to determine the minimum breakthrough volume so as to complete the core acidizing corrosion experiment.

Description

Carbonate rock core acidizing corrosion experimental device

Technical Field

The utility model relates to an oilfield acidification corrosion experiment technology, in particular to a carbonate rock core acidification corrosion experiment device.

Background

In the petroleum industry, for low-pore hypotonic carbonate reservoirs, acidizing, which is an important measure for improving yield, can generate wormholes under certain conditions, and the wormholes can form a high-conductivity channel between a shaft and a stratum, so that the recovery ratio of oil and gas is improved. However, in practical acidizing engineering, there are various erosion patterns, wherein wormhole erosion is the most excellent one, and the aim of improving the permeability of the stratum can be achieved by using extremely low acid liquid amount. The main factors affecting the development of the earthworm pores on site are injection speed, acid liquor concentration, acid liquor type and the like. In the acidizing experiment research, an optimal injection speed of the acid solution exists in the acidizing corrosion displacement process of the carbonate rock, the corrosion form at the speed is wormhole corrosion, the consumption of the acid solution is minimum, and the minimum breakthrough volume is used for measuring.

Therefore, the relation between the speed and the breakthrough volume is established in a laboratory, the relation between the concentration and the breakthrough volume is established, and the relation between the acid liquor type and the breakthrough volume is established to determine the minimum breakthrough volume, so that the method has great guiding significance on the on-site acidification construction. At present, laboratories use high temperature and high pressure formation damage evaluation test platforms to evaluate this type of experiment, and no special equipment is available to complete the experiment.

Disclosure of Invention

The utility model aims at overcoming the defects in the prior art, and provides a carbonate rock core acidification corrosion experimental device, wherein a temperature sensor is arranged on the side face of a rock core holder, and when the temperature of the rock core holder reaches a set temperature, an acid liquid displacement experiment is started, wherein the temperature of the rock core holder is approximately equal to the temperature of acid liquid in an intermediate container.

The utility model relates to a carbonate rock core acidification corrosion experiment device, which adopts the technical scheme that: the device comprises a advection displacement pump (1), a core inlet end pressure sensor (2), a pH value display table (3), a stop plunger (7), a rubber cylinder (8), a carbonate core (9), a plunger device (10), a back pressure device (11), a core holder (14), a confining pressure pump (15) and a liquid discharge valve (16), wherein the rubber cylinder (8) is arranged in the core holder (14), the stop plunger (7), the carbonate core (9) and the plunger device (10) are arranged in an inner cavity of the rubber cylinder (8), the stop plunger (7) is arranged at one end of the carbonate core (9), and the plunger device (10) is arranged at the other end of the carbonate core (9); the right-hand member of rock core holder (14) is through export pipeline connection flowing back valve (16) and back pressure device (11), the middle part of rock core holder (14) is through pipeline connection enclosing pump (15), the left end of rock core holder (14) is connected to advection displacement pump (1) through the inlet line, and is equipped with rock core entry end pressure sensor (2) and pH value display table (3) on the inlet line.

Preferably, a core holder side temperature sensor (6) is arranged in the left end of the core holder (14), and the outer end of the core holder side temperature sensor (6) is connected to a core holder temperature display table (4) through a wire.

Preferably, the pH value display table (3) is connected with a pH acidimeter (13) through a wire, and the pH acidimeter (13) is arranged on the inlet pipeline.

Preferably, the pH acidometer (13) is led out of a wire through a sealing device (12), and then connected with a pH value display table (3) through the wire.

Preferably, a core outlet end pressure sensor (5) is installed on an outlet pipeline at the right end of the core holder (14).

The beneficial effects of the utility model are as follows: the confining pressure pump is connected with the confining pressure interface of the core holder, and the confining pressure pump is slowly started to drive distilled water liquid into the annular space in the core holder until the predetermined pressure is reached; the back pressure is regulated to be between 0.1 and 10 Mpa by a back pressure device, and depends on the temperature displayed by a temperature display table of the core holder;

when a core holder temperature display table on the left side of the core holder reaches a set temperature, setting the flow of a advection displacement pump, starting the advection pump to pump saline water in a first stage, testing the core permeability, and stopping displacement after the experiment is completed; the second stage starts a advection pump to pump acid liquor, and experiments for breaking through the volume are carried out; and establishing a relation between the speed and the breakthrough volume in a laboratory, establishing a relation between the concentration and the breakthrough volume, and establishing a relation between the acid liquor type and the breakthrough volume to determine the minimum breakthrough volume so as to complete the core acidification corrosion experiment.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

in the upper graph: the horizontal flow displacement pump 1, the core inlet end pressure sensor 2, the pH value display table 3, the core holder temperature display table 4, the core outlet end pressure sensor 5, the core holder side temperature sensor 6, the stop plunger 7, the rubber cylinder 8, the carbonate core 9, the plunger device 10, the back pressure device 11, the sealing device 12, the pH acidimeter 13, the core holder 14, the confining pressure pump 15 and the drain valve 16.

Detailed Description

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.

Embodiment 1, refer to fig. 1, the carbonate rock core acidizing corrosion experimental device provided by the utility model comprises a advection displacement pump 1, a rock core inlet end pressure sensor 2, a pH value display table 3, a stop plunger 7, a rubber cylinder 8, a carbonate rock core 9, a plunger device 10, a back pressure device 11, a rock core holder 14, a confining pressure pump 15 and a drain valve 16, wherein the rubber cylinder 8 is arranged in the rock core holder 14, the stop plunger 7, the carbonate rock core 9 and the plunger device 10 are arranged in the inner cavity of the rubber cylinder 8, the stop plunger 7 is arranged at one end of the carbonate rock core 9, and the plunger device 10 is arranged at the other end of the carbonate rock core 9; the right end of the core holder 14 is connected with a drain valve 16 and a back pressure device 11 through an outlet pipeline, the middle part of the core holder 14 is connected with a confining pressure pump 15 through a pipeline, the left end of the core holder 14 is connected to a advection displacement pump 1 through an inlet pipeline, and a core inlet end pressure sensor 2 and a pH value display table 3 are arranged on the inlet pipeline.

The core holder 14 is provided with a core holder side temperature sensor 6 inside the left end, and the outer end of the core holder side temperature sensor 6 is connected to the core holder temperature display table 4 through a wire.

The above pH value display table 3 is connected to the pH meter 13 by a wire, and the pH meter 13 is installed on the inlet line.

The pH acidometer 13 is led out of the wire through the sealing device 12, and is connected with the pH value display table 3 through the wire.

A core outlet end pressure sensor 5 is arranged on an outlet pipeline at the right end of the core holder 14; the back pressure device 11 is used for setting the pressure of the outlet, simulating the pressure of the stratum, and loading the back pressure by adopting the pressure of a nitrogen cylinder in a laboratory.

In the use of the present utility model,

1. according to the connecting device of fig. 1, the installation of the core holder 14 is completed, and the stop plunger 7, the core 9 and the plunger device 10 are sequentially installed in the rubber barrel 8 in the core holder 14;

2. injection confining pressure and back pressure: the confining pressure pump 15 is connected with the confining pressure interface of the core holder 14, and the confining pressure pump 15 is slowly started to pump distilled water liquid into the annular space in the core holder 14 until the preset pressure of 7 MPa is reached; the back pressure is regulated to be between 0.1 and 10 Mpa by a back pressure device 11, and depends on the temperature displayed by a core holder temperature display table 4;

3. inserting a core holder side temperature sensor 6 into the left side port of the core holder 14, setting a required temperature on a core holder temperature display table 4, and starting heating;

4. when the temperature display table 4 of the core holder at the left side of the core holder reaches a set temperature, setting the flow of the advection displacement pump 1, starting the advection pump 1 to pump saline water in the first stage, testing the core permeability, and stopping displacement after the experiment is completed; the second stage starts the advection pump 1 to pump acid liquor, and performs a breakthrough volume experiment; and establishing a relation between the speed and the breakthrough volume in a laboratory, establishing a relation between the concentration and the breakthrough volume, and establishing a relation between the acid liquor type and the breakthrough volume to determine the minimum breakthrough volume.

The above description is of the preferred embodiments of the present utility model, and any person skilled in the art may modify the present utility model or make modifications to the present utility model with the technical solutions described above. Therefore, any simple modification or equivalent made according to the technical solution of the present utility model falls within the scope of the protection claimed by the present utility model.

Claims

1. An experimental device for acidizing and corrosion of carbonate rock core is characterized in that: the device comprises a advection displacement pump (1), a core inlet end pressure sensor (2), a pH value display table (3), a stop plunger (7), a rubber cylinder (8), a carbonate core (9), a plunger device (10), a back pressure device (11), a core holder (14), a confining pressure pump (15) and a liquid discharge valve (16), wherein the rubber cylinder (8) is arranged in the core holder (14), the stop plunger (7), the carbonate core (9) and the plunger device (10) are arranged in an inner cavity of the rubber cylinder (8), the stop plunger (7) is arranged at one end of the carbonate core (9), and the plunger device (10) is arranged at the other end of the carbonate core (9); the right-hand member of rock core holder (14) is through export pipeline connection flowing back valve (16) and back pressure device (11), the middle part of rock core holder (14) is through pipeline connection enclosing pump (15), the left end of rock core holder (14) is connected to advection displacement pump (1) through the inlet line, and is equipped with rock core entry end pressure sensor (2) and pH value display table (3) on the inlet line.

2. The carbonate core acidizing corrosion test device according to claim 1, wherein: the inside rock core holder side temperature sensor (6) that is equipped with of left end of rock core holder (14), the outer end of rock core holder side temperature sensor (6) is connected to rock core holder temperature display table (4) through the wire.

3. The carbonate core acidizing corrosion test device according to claim 2, wherein: the pH value display table (3) is connected with a pH acidometer (13) through a wire, and the pH acidometer (13) is arranged on an inlet pipeline.

4. A carbonate core acidizing corrosion test apparatus as recited in claim 3, wherein: the pH acidometer (13) is led out of a lead through a sealing device (12), and is connected with a pH value display table (3) through the lead.

5. The carbonate core acidizing corrosion test apparatus as recited in claim 4, wherein: and a rock core outlet end pressure sensor (5) is arranged on an outlet pipeline at the right end of the rock core holder (14).