A device and method for determining core porosity by dual channel kerosene method

Abstract

A device and method for measuring core porosity by dual-channel kerosene method, which belongs to the technical field of experimental core porosity measurement of tight oil reservoirs, comprises a vacuum pump, a drying bottle, a multi-way valve, a vacuum gauge, a vacuum dryer, a kerosene bottle, a waste kerosene collection bottle, a core holder, and a confining pressure pump, wherein the vacuum pump, the drying bottle, the multi-way valve, and the vacuum gauge are sequentially connected by pipelines, and the originally dispersed vacuum pump, pressure gauge, dryer, kerosene bottle, etc. are integrated into one device through flow path control and the multi-way valve, and the core holder and the confining pressure pump are added, thereby solving the problem of measuring the porosity of cores of regular and irregular shapes in batches, eliminating or reducing the problems of mutual interference of measurement results, large error, long test period, low efficiency, and high labor cost.

Description

Technical Field

[0001] The invention belongs to the technical field of tight oil reservoir experimental core porosity measurement, and particularly relates to a device and method for measuring core porosity using a dual-channel kerosene method. Background Art

[0002] like Figure 2 As shown, the traditional kerosene saturation method for measuring porosity uses a vacuum pump, vacuum dryer, and kerosene to saturate the core sample, and then determines the effective porosity of the rock sample based on Archimedes' principle. This results in a large footprint, complex testing procedures, and a high risk of operator errors. The present invention addresses this issue by integrating relevant equipment and instruments and controlling process switching through a multi-way valve to achieve measurement results.

[0003] Core porosity is a parameter that measures the volume of pores contained in a unit volume of rock. It reflects the ability of underground rock to store fluids and is a key indicator for evaluating oilfield reserves and capacity development. This technological achievement builds on previous work, integrating technology and materials. Based on systematic and objective analysis, this system integrates various components into a process-based approach according to operational procedures to achieve core porosity testing. Practical application has reduced workload and systematic errors, significantly shortening analysis cycles and significantly improving work efficiency. The optimized device testing principle complies with relevant evaluation and standards. Summary of the Invention

[0004] In order to solve the problem of low pipe string installation efficiency during pipe tripping operations, the present invention proposes: a device for measuring core porosity using a dual-channel kerosene method, comprising a vacuum pump, a drying bottle, a multi-way valve, a vacuum gauge, a vacuum dryer, a kerosene bottle, a waste kerosene collection bottle, a core holder, and a confining pressure pump. The vacuum pump, drying bottle, multi-way valve, and vacuum gauge are sequentially connected by pipelines. The multi-way valve is connected to the vacuum dryer pipeline via a K1 evacuation valve, the vacuum dryer is connected to the kerosene bottle pipeline via a K2 oil discharge valve, and a pipeline with a K4 evacuation valve is provided on the kerosene bottle; the multi-way valve is connected to the kerosene bottle pipeline via a K3 kerosene evacuation valve, the vacuum dryer is connected to the waste kerosene collection bottle pipeline via a K5 waste kerosene collection valve, the waste kerosene collection bottle is connected to the multi-way valve pipeline, the core holder is connected to the multi-way valve pipeline via a K8 evacuation valve, the core holder is connected to the kerosene bottle pipeline via a K6 oil discharge valve, and the core holder is connected to the confining pressure pump pipeline via a K7 confining pressure valve.

[0005] Furthermore, the vacuum pump is an 8L / min wheel vacuum pump.

[0006] The device for measuring core porosity by double-channel kerosene method is used for measuring the porosity of a core.

[0007] Further, the core is placed into a core holder, a confining pressure valve is opened, and a confining pressure pump is used to add confining pressure.

[0008] Further, after checking the sealing, a k1 evacuation valve and a k8 evacuation valve on a control panel are opened, a k3 kerosene evacuation valve is opened, the system is evacuated, and when a vacuum gauge reaches -0.1 MPa and the pointer no longer changes, a k2 oil discharge valve and a k6 oil discharge valve are opened to soak the core in kerosene.

[0009] Further, the evacuation is continued, and when the core no longer produces bubbles or the vacuum pump reaches a stable -0.1 MPa, the evacuation is stopped.

[0010] Further, a k4 vent valve is opened, and after stabilization, the core is taken out.

[0011] Further, a k5 waste kerosene collection valve is opened, and the used kerosene is introduced into a waste kerosene collection bottle by vacuumizing.

[0012] The device has the following advantages:

[0013] Through the device, the batch processing capacity of core samples is greatly enhanced, the error is greatly reduced, and the production efficiency is significantly improved.

[0014] (1) Simple operation and short personnel training period

[0015] The control of each part of the device is concentrated on the control panel, the operation process is simple, and the training time, learning period and operation period of the operator are greatly reduced.

[0016] (2) Measurement time is shortened

[0017] Using the device, the measurement time of a single batch of samples is shortened from more than 48h to about 6h.

[0018] (3) Kerosene consumption is reduced

[0019] Using the device, the single batch kerosene consumption is 1 / 5 of the original.

[0020] (4) Reduces the equipment running time

[0021] The vacuum pump running time is shortened from 48h to 6h per batch, which reduces equipment wear and tear, prolongs the service life, and reduces maintenance costs.

[0022] (5) Energy saving and efficiency improvement

[0023] The operating time of the vacuum pump per batch is shortened from 48 hours to 6 hours, saving 84 degrees of electricity, and nearly 2,000 degrees per year.

[0024] (6) Reduced labor intensity

[0025] Since the device adopts pipeline integration, it reduces the need to move the kerosene bottle, connect the vacuum pipeline, and open the vacuum dryer to pour out the kerosene, greatly reducing the labor intensity of the operator.

[0026] (7) Staff reduction

[0027] The number of operators on duty has been reduced from three people taking turns to one person on a single shift, which greatly saves human resources.

[0028] (8) Improved accuracy

[0029] The use of this device provides a strong guarantee for various measures in the test system. The vacuum degree, precision, accuracy and success rate are comprehensively improved, achieving the expected results and having good economic benefits.

[0030] (9) Used kerosene can be directly poured into the waste kerosene collection bottle. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the process of the dual-channel kerosene method for measuring core porosity;

[0032] Figure 2 This is a schematic diagram of the flow chart of the device for measuring core porosity using the traditional kerosene method.

[0033] Among them, the accompanying drawings are marked as follows: 1. vacuum pump 2. drying bottle 3. multi-way valve 4. vacuum gauge 5. vacuum dryer 6. kerosene bottle 7. waste kerosene collection bottle 8. core clamp 9. confining pressure pump k1 vacuum valve, k8 vacuum valve, k2 oil drain valve, k6 oil drain valve, k3 kerosene vacuum valve, k4 drain valve, k5 waste kerosene collection valve, k7 confining pressure valve. DETAILED DESCRIPTION

[0034] A device for measuring core porosity using a dual-channel kerosene method, such as Figure 1As shown, including vacuum pump 1, drying bottle 2, multi-way valve 3, vacuum gauge 4, vacuum dryer 5, kerosene bottle 6, waste kerosene collection bottle 7, core holder 8, confining pressure pump 9, vacuum pump 1, drying bottle 2, multi-way valve 3, vacuum gauge 4 are sequentially connected by pipeline, multi-way valve 3 is connected by pipeline with vacuum dryer 5 through k1 evacuation valve, vacuum dryer 5 is connected by pipeline with kerosene bottle 6 through k2 oil drain valve, kerosene bottle 6 is provided with pipeline with k4 emptying valve; Multi-way valve 3 is connected by pipeline with kerosene bottle 6 through k3 kerosene evacuation valve, vacuum dryer 5 is connected by pipeline with waste kerosene collection bottle 7 through k5 waste kerosene collection valve, waste kerosene collection bottle 7 is connected by pipeline with multi-way valve 3, core holder 8 is connected by pipeline with multi-way valve 3 through k8 evacuation valve, core holder 8 is connected by pipeline with kerosene bottle 6 through k6 oil drain valve, core holder 8 is connected by pipeline with confining pressure pump 9 through k7 confining pressure valve.

[0035] Among them, the vacuum pump 1 is a 8L / min wheel type vacuum pump.

[0036] The device for determining the core porosity by double-channel kerosene method determines the core porosity by the following method: the weighed, numbered and placed in the iron plate core is placed in the vacuum dryer 5.

[0037] Among them, the core is placed in the core holder 8, the k7 confining pressure valve is opened, and the confining pressure is added by the confining pressure pump 9.

[0038] Among them, after checking the sealing, the k1 evacuation valve and the k8 evacuation valve are opened on the control panel, and the k3 kerosene evacuation valve is opened at the same time, the system is evacuated, and the k2 oil drain valve and the k6 oil drain valve are opened when the vacuum gauge 4 reaches-0.1MPa and the pointer no longer changes for about 30min to 1h.

[0039] Among them, the evacuation is continued, and the evacuation is stopped when the core no longer produces bubbles or the vacuum pump 1 reaches a stable-0.1MPa.

[0040] Among them, the k4 emptying valve is opened, and the core is taken out after stabilization.

[0041] Among them, the k5 waste kerosene collection valve is opened, and the used kerosene is introduced into the waste kerosene collection bottle 7 by the vacuum method.

[0042] The kerosene method for determining the core porosity is a very professional technology in oilfield development experiment.

[0043] In the process of determining the core porosity by kerosene method, first of all, the experimental content and standard specification to be obtained in the porosity analysis process need to be clear,

[0044] Secondly, the best process of optimizing and refining the experiment is clear;

[0045] Finally, by integrating various component instruments and equipment, the related functions are realized, and the testing purpose is achieved.

[0046] The purpose of the present application is to solve the problems of batch regularity and irregular shape core porosity measurement by integrating the originally dispersed vacuum pump, pressure gauge, dryer, kerosene bottle, etc. into a device, adding a core holder and confining pressure pump, etc. to eliminate or reduce the problems of mutual interference of measurement results, large error, long test period, low efficiency, and high labor cost, etc.

[0047] The present application is realized by the following technologies.

[0048] (1) Evacuation system: composed of a 8L / min wheel type vacuum pump, six-way valve, level valve, vacuum gauge, and pipeline, etc. to provide a vacuum environment for kerosene evacuation and vacuum dryer. The vacuum standard and test time are determined according to the indication of the vacuum gauge and relevant standard specifications.

[0049] (2) Control system: according to the indication of the vacuum gauge on the panel, the kerosene method for measuring core porosity device management standard is used to control the system evacuation, kerosene evacuation, kerosene filling, system emptying, etc. to test the core sample.

[0050] (3) Emptying system: related operations are performed through the level valve on the control panel to achieve the purpose of system emptying.

[0051] (4) Kerosene filling system: after reaching the standard requirement, the operation is performed through the level valve on the control panel to achieve the purpose of allowing the evacuated kerosene to enter the vacuum dryer.

[0052] (5) By increasing the loop control, the waste kerosene can be recovered without opening the container.

[0053] The present application is further described in combination with examples, and the steps are as follows:

[0054] The weighed and numbered cores placed in the iron plate are placed in the vacuum dryer. Or the regular core is placed in the core holder, and the confining pressure is added.

[0055] After checking the sealing, the evacuation valve on the control panel is opened. At the same time, the kerosene evacuation valve is opened, and the system is evacuated. After about 30min to 1h, when the vacuum gauge reaches -0.1MPa and the pointer no longer changes, the oil valve is opened for kerosene soaking.

[0056] Continue to evacuate, and stop the evacuation when the core no longer produces bubbles or the vacuum pump reaches a stable -0.1MPa.

[0057] The emptying valve is opened, and the core is taken out after stabilization. The next step is performed according to the relevant standard.

[0058] Open the k5 waste kerosene collection valve, and use the vacuum method to guide the used kerosene into the waste kerosene collection bottle.

[0059] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical scheme and concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A device for measuring core porosity using a dual-channel kerosene method, characterized in that: The invention comprises a vacuum pump (1), a drying bottle (2), a multi-way valve (3), a vacuum gauge (4), a vacuum dryer (5), a kerosene bottle (6), a waste kerosene collection bottle (7), a core holder (8), and a confining pressure pump (9). The vacuum pump (1), the drying bottle (2), the multi-way valve (3), and the vacuum gauge (4) are sequentially connected by pipelines. The multi-way valve (3) is connected to the vacuum dryer (5) pipeline through a k1 evacuation valve. The vacuum dryer (5) is connected to the kerosene bottle (6) pipeline through a k2 oil discharge valve. The kerosene bottle (6) is provided with a k4 discharge valve. The multi-way valve (3) is connected to the kerosene bottle (6) pipeline through the k3 kerosene vacuum valve, the vacuum dryer (5) is connected to the waste kerosene collection bottle (7) pipeline through the k5 waste kerosene collection valve, the waste kerosene collection bottle (7) is connected to the multi-way valve (3) pipeline, the core holder (8) is connected to the multi-way valve (3) pipeline through the k8 vacuum valve, the core holder (8) is connected to the kerosene bottle (6) pipeline through the k6 oil discharge valve, and the core holder (8) is connected to the confining pressure pump (9) pipeline through the k7 confining pressure valve.

2. The device for measuring core porosity using a dual-channel kerosene method according to claim 1, wherein: The vacuum pump (1) is an 8L / min wheel-type vacuum pump.

3. The method for measuring core porosity by the device for measuring core porosity by the dual-channel kerosene method according to claim 1, characterized in that: The weighed, numbered cores placed in an iron pan are placed in a vacuum desiccator (5).

4. The method for measuring core porosity by the dual-channel kerosene method according to claim 3, wherein: Alternatively, the core is placed in the core holder (8), the K7 confining pressure valve is opened, and the confining pressure is applied using the confining pressure pump (9).

5. The method for measuring core porosity by the dual-channel kerosene method according to claim 4, wherein: After checking the sealing, open the K1 evacuation valve and K8 evacuation valve on the control panel, and open the K3 kerosene evacuation valve at the same time to evacuate the system for 30 minutes to 1 hour. When the vacuum gauge (4) reaches -0.1MPa and the pointer no longer changes, open the K2 drain valve and K6 drain valve to soak the system in kerosene.

6. The method for measuring core porosity using a dual-channel kerosene method according to claim 5, wherein: Continue to evacuate until no more bubbles are generated in the core or the vacuum pump (1) reaches a stable pressure of -0.1 MPa.

7. The method for measuring core porosity using a dual-channel kerosene method according to claim 6, wherein: Open the K4 vent valve and take out the core after it stabilizes.

8. The method for measuring core porosity using a dual-channel kerosene method according to claim 7, wherein: Open the K5 waste kerosene collection valve and use the vacuum method to guide the used kerosene into the waste kerosene collection bottle (7).

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