Device and method for measuring porosity of rock core by two-channel kerosene method

Abstract

The invention relates to a device and a method for measuring core porosity by a double-channel kerosene method, which belong to the technical field of tight oil reservoir experiment core porosity measurement and comprise a vacuum pump, a drying bottle, a multi-way valve, a vacuum meter, a vacuum dryer, a kerosene bottle, a waste kerosene collecting bottle, a core holder and a confining pressure pump, by means of flow path control, a multi-way valve and the like, a vacuum pump, a pressure gauge, a dryer, a kerosene bottle and the like which are originally scattered are integrated into a whole, a core holder, a confining pressure pump and the like are added, the problem of measuring the porosity of cores with regular batches and irregular shapes is solved, and the problems that measuring results are much in mutual interference, large in error, long in testing period, low in efficiency and the like are eliminated or reduced. And more labor is consumed.

Description

Technical Field

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

[0002] like Figure 2 As shown, when the traditional kerosene saturation method is used to measure porosity, a vacuum pump, a vacuum dryer, kerosene, etc. are used to vacuum saturate the core sample, and the effective porosity of the rock sample is measured according to Archimedes' principle. As a result, various objects occupy a large area, the process is complicated during the test, and operators are prone to work errors. The present invention is mainly aimed at the above phenomenon, and the measurement purpose is achieved by integrating relevant equipment and instruments and controlling the process conversion through a multi-way valve.

[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 rocks to store fluids. It is an important indicator for evaluating oilfield reserves and capacity construction. This technical achievement is based on previous work, through technology integration, material integration and other research, and on the basis of systematic and objective analysis, the core porosity test is realized by integrating various components in a process according to the operating procedures. Through actual use, the workload is reduced while the system error is also reduced. The analysis cycle is greatly shortened while the work efficiency is greatly improved. The optimized device test principle meets the relevant evaluation and specifications. Summary of the invention

[0004] In order to solve the problem of low pipe column installation efficiency during pipe pulling and lowering operation, the present invention proposes: a device for determining core porosity by 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 clamp, and a confining pressure pump. The vacuum pump, the drying bottle, the multi-way valve, and the vacuum gauge are connected by pipelines in sequence. The multi-way valve is connected to the vacuum dryer pipeline through a K1 evacuation valve, the vacuum dryer is connected to the kerosene bottle pipeline through a K2 oil discharge valve, and a pipeline with a K4 venting valve is arranged on the kerosene bottle; the multi-way valve is connected to the kerosene bottle pipeline through a K3 kerosene evacuation valve, the vacuum dryer is connected to the waste kerosene collection bottle pipeline through a K5 waste kerosene collection valve, the waste kerosene collection bottle is connected to the multi-way valve pipeline, the core clamp is connected to the multi-way valve pipeline through a K8 evacuation valve, the core clamp is connected to the kerosene bottle pipeline through a K6 oil discharge valve, and the core clamp is connected to the confining pressure pump pipeline through a K7 confining pressure valve.

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

[0006] Device for determining core porosity by dual-channel kerosene method The method for determining core porosity is to place the weighed, numbered cores placed in an iron plate in a vacuum dryer.

[0007] Furthermore, the core is placed in the core holder, the K7 confining pressure valve is opened, and the confining pressure is applied by a confining pressure pump.

[0008] Furthermore, 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. When the vacuum gauge reaches -0.1MPa and the pointer no longer changes after about 30 minutes to 1 hour, open the K2 drain valve and K6 drain valve to soak the system in kerosene.

[0009] Furthermore, continue to evacuate until no more bubbles are generated in the core or the vacuum pump reaches a stable -0.1 MPa and stops evacuating.

[0010] Further, open the K4 vent valve and take out the core after stabilization.

[0011] Further, the K5 waste kerosene collection valve is opened, and the used kerosene is introduced into the waste kerosene collection bottle by using a vacuum method.

[0012] The beneficial effects of the present invention are:

[0013] Through the device, after actual use, the batch processing capacity of core samples has been greatly enhanced, the errors have been greatly reduced, and the production efficiency has been significantly improved. It is not only simple and efficient to operate, but also far better than the various dispersed devices originally used to measure porosity.

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

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

[0016] (2) Shortened measurement time

[0017] By using this device, the measurement time of a single batch of samples is shortened from more than 48 hours to about 6 hours.

[0018] (3) Reduction in kerosene consumption

[0019] By adopting this device, the kerosene loss of a single batch is reduced to 1 / 5 of the original.

[0020] (4) Reduced equipment operating time

[0021] The operating time of the vacuum pump per batch was shortened from 48 hours to 6 hours, which reduced equipment loss, extended service life and reduced maintenance costs.

[0022] (5) Energy saving and efficiency improvement

[0023] The operation 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] The device adopts pipeline integration, which reduces the original process of moving kerosene bottles, connecting evacuation pipelines, and opening vacuum dryers to pour out kerosene, greatly reducing the labor intensity of operators.

[0026] (7) Reduction in staff

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

[0028] (8) Improved accuracy

[0029] By adopting this device, various measures of the test system have been strongly guaranteed. The vacuum degree, precision, accuracy and success rate are comprehensively improved, achieving the expected effect and having good economic effect.

[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 device for measuring core porosity using the dual-channel kerosene method;

[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: 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 by a dual-channel kerosene method, such as Figure 1As shown, it includes 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 connected in sequence by pipelines. The multi-way valve 3 is connected to the vacuum dryer 5 pipeline through the k1 evacuation valve, the vacuum dryer 5 is connected to the kerosene bottle 6 pipeline through the k2 oil discharge valve, and a pipeline with a k4 venting valve is arranged on the kerosene bottle 6; the multi-way valve 3 is connected to the kerosene bottle 6 pipeline through the k3 kerosene evacuation 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 evacuation 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.

[0035] Wherein, the vacuum pump 1 is a wheel-type vacuum pump of 8L / min.

[0036] Device for determining core porosity by dual-channel kerosene method The method for determining core porosity is to place the weighed, numbered cores placed in an iron plate in a 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 applied by the confining pressure pump 9.

[0038] Among them, after checking the sealing, open the k1 vacuum valve and k8 vacuum valve on the control panel, and open the k3 kerosene vacuum valve at the same time to evacuate the system. After about 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 for kerosene soaking.

[0039] The vacuum is continued until no more bubbles are generated in the core or the vacuum pump 1 reaches a stable pressure of -0.1 MPa and then stops.

[0040] Among them, open the K4 vent valve and take out the core after it stabilizes.

[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 using a vacuum method.

[0042] The kerosene method for determining core porosity is a highly professional technology in oilfield development experiments.

[0043] In the process of measuring core porosity by kerosene method, it is necessary to first clarify the experimental content and standard specifications to be obtained in the porosity analysis process.

[0044] Secondly, identify the best process for optimizing and refining the experiment;

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

[0046] The purpose of the present invention is to integrate the originally dispersed vacuum pump, pressure gauge, dryer, kerosene bottle, etc. into an integrated device through flow path control, multi-way valve, etc., and add a core holder and a confining pressure pump, etc., to solve the problem of measuring the porosity of cores with regular and irregular shapes in batches. It eliminates or reduces the problems of many interferences between measurement results, large errors, long test cycles, low efficiency, and high labor costs.

[0047] The present invention is achieved through the following technologies.

[0048] (1) Vacuum system: It consists of an 8L / min wheel vacuum pump, a six-way valve, a horizontal valve, a vacuum gauge and pipelines. It provides 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 standards and specifications.

[0049] (2) Control system: According to the indication of the vacuum gauge on the panel and in accordance with the management standard of the device for measuring the core porosity by the kerosene method, the horizontal valve is used to control the system to evacuate, kerosene is evacuated, kerosene is added, and the system is vented to test the core samples.

[0050] (3) Emptying the system: The system can be emptied by operating the horizontal valve on the control panel.

[0051] (4) Kerosene placement system: After meeting the standard requirements, operate the horizontal valve on the control panel to allow the evacuated kerosene to enter the vacuum dryer.

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

[0053] The present invention is further described with reference to examples, and the steps are as follows:

[0054] Place the weighed and numbered cores in an iron plate in a vacuum dryer. Alternatively, place regular cores in a core holder and apply confining pressure.

[0055] After checking the sealing, open the evacuation valve on the control panel. At the same time, open the kerosene evacuation valve to evacuate the system. After about 30 minutes to 1 hour, when the vacuum gauge reaches -0.1MPa and the pointer no longer changes, open the oil release valve to soak in kerosene.

[0056] Continue to evacuate until no more bubbles are generated in the core or the vacuum pump reaches a stable -0.1MPa.

[0057] Open the vent valve, take out the core after it stabilizes, and proceed to the next step according to relevant standards.

[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 description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

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) by a pipeline through a k1 evacuation valve. The vacuum dryer (5) is connected to the kerosene bottle (6) by a 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 release 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 by dual-channel kerosene method according to claim 1, characterized in that: The vacuum pump (1) is a wheel-type vacuum pump with a capacity of 8 L / min.

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 rock cores placed in an iron pan are placed in a vacuum dryer (5).

4. The method for measuring core porosity by dual-channel kerosene method as claimed in claim 3, characterized in that: Alternatively, the core is placed in the core holder (8), the k7 confining pressure valve is opened, and the confining pressure is applied by the confining pressure pump (9).

5. The method for measuring core porosity by dual-channel kerosene method as claimed in claim 4, characterized in that: 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. After about 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 by dual-channel kerosene method according to claim 5, characterized in that: Continue to evacuate until no more bubbles are generated in the core or the vacuum pump (1) reaches a stable -0.1 MPa and then stops evacuating.

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

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

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