Shale oil in-situ heating modification test device

Abstract

The utility model discloses a shale oil in-situ heating modification test device which comprises a shell, a cavity for loading a sample is arranged in the shell, a heating coil is wound on the outer wall of the shell, ports are arranged on two opposite end faces of the shell, a cover body assembly is arranged at the position of each port, and the cover body assembly comprises a sealing cover, an end cover and a hollow shaft. The sealing cover is used for sealing the port, a first through hole is formed in the sealing cover, the end of the sample extends into the first through hole, the end cover is fixedly installed on the outer side face of the sealing cover, a second through hole is formed in the end cover, the hollow shaft penetrates through the second through hole and can axially move, and a ballast head is integrally formed at the outer end of the hollow shaft; third through holes communicated with the interior of the hollow shaft are formed in the side walls of the ballast heads, the inner end of the hollow shaft extends into the second through holes to be in close contact with the sample, one ballast head is matched with the hydraulic oil cylinder, and the other ballast head is matched with the counter-force wall plate. The produced shale oil is analyzed through tests, and development of the shale oil underground in-situ heating technology is promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of shale oil mining, and in particular to a shale oil in-situ heating and modification test device. Background Art

[0002] Shale oil refers to the petroleum resources contained in shale formations, primarily shale. This includes oil trapped in the pores and fractures of the shale, as well as oil in adjacent layers and interlayers of dense carbonate or clastic rocks within the shale formation. China has abundant shale oil resources. Shale oil buried less than 300 meters can be mined through open pit mining and transported to refining plants for extraction. However, shale oil buried deeper than 300 meters can only be converted into shale oil by heating the shale layer and then brought to the surface through production wells, a process known as underground in-situ heating of shale oil. Currently, this technology is still immature. Due to the complex thermal cracking process of shale layers and the high pressures they experience underground, which also affect this process, the development of in-situ heating technology requires fully simulating the thermal cracking process of shale layers under high-pressure underground conditions to ensure the expected economic benefits. To this end, we have designed and constructed a shale oil in-situ heating reforming test device. Utility Model Content

[0003] The purpose of this utility model is to provide a shale oil in-situ heating and reforming test device, which aims to solve at least one of the technical problems existing in the above-mentioned prior art. To achieve the above-mentioned purpose, the technical solutions adopted are as follows:

[0004] The shale oil in-situ heating and reforming test device includes a shell, a cavity for loading a sample in the shell, a heating coil wrapped around the outer wall of the shell, ports are provided on both opposite end faces of the shell, and a cover assembly is installed at each port position. The cover assembly includes a sealing cover, an end cover and a hollow shaft. The sealing cover is connected to the shell and is used to seal the port. The sealing cover is provided with a first through hole, and the end of the sample extends into the first through hole. The end cover is fixedly installed on the outer side of the sealing cover. The end cover is provided with a second through hole, and the hollow shaft passes through the second through hole and can move axially. At least two sealing rings are provided between the inner wall of the second through hole and the outer wall of the hollow shaft. A ballast head is integrally formed with the outer end of the hollow shaft, and a third through hole connected to the inside of the hollow shaft is provided on the side wall of the ballast head. The inner end of the hollow shaft extends into the second through hole and is in close contact with the sample. One of the ballast heads cooperates with the hydraulic cylinder, and the other ballast head cooperates with the reaction wall panel.

[0005] Preferably, a plurality of pairs of pillars are arranged at intervals in the housing, and each pair of pillars includes two oppositely arranged pillars to support the sample.

[0006] Preferably, the hydraulic cylinder is equipped with a spoke-type pressure sensor.

[0007] Preferably, the device further comprises a base, and the shell is fixedly mounted on the base via a bracket.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] The utility model discloses a shale oil in-situ heating and modification test device, which analyzes the produced shale oil by changing the temperature, the axial pressure on the sample and the hydraulic pressure on the right end face of the sample, which helps to promote the development of underground in-situ heating technology of shale oil and provide theoretical support for practical application. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0012] Figure 2 It is a schematic diagram of the internal structure of the shell of the utility model.

[0013] In the figure: 1. Base; 2. Shell; 3. Reaction wall panel; 4. Hydraulic cylinder; 5. Pillar; 6. Heating coil; 7. Sealing cover; 8. End cover; 9. Hollow shaft; 10. First through hole; 11. Second through hole; 12. Ballast head; 13. Third through hole; 14. Spoke pressure sensor. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0015] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0016] like Figure 1As shown, a preferred embodiment of the utility model provides a shale oil in-situ heating and modification test device, which includes a base 1, which is a platform structure. A shell 2 is fixedly installed on the base 1 through a bracket, a reaction wall panel 3 is fixedly installed on the left side of the shell 2, and a hydraulic cylinder 4 is installed on the right side of the shell 2.

[0017] like Figure 2 As shown, the shell 2 has a cavity for loading the sample. The sample is cylindrical and arranged in the cavity along the left and right directions. Several pairs of pillars are arranged at intervals in the shell 2. Each pair of pillars includes two pillars 5 arranged opposite each other up and down, and the ends of the pillars 5 are semicircular. The two pillars 5 clamp the sample to support the sample and prevent the sample from breaking.

[0018] The outer wall of the shell 2 is wound with a heating coil 6, and the external heating device controls the heating coil to heat the cavity, thereby providing a temperature-controllable high-temperature test environment for the sample.

[0019] Ports are provided on both the left and right end surfaces of the housing 2, with a cover assembly installed at each port location. The cover assembly includes a sealing cover 7, an end cap 8, and a hollow shaft 9. The sealing cover 7 is bolted to the housing 2 to seal the ports. A first through-hole 10 is provided in the center of the sealing cover 7, connecting the inside and outside of the housing. The end of the sample extends into the first through-hole 10. The end cap 8 is bolted to the outer side of the sealing cover 7. A second through-hole 11 is provided in the center of the end cap 8. The first through-hole 10 and the second through-hole 11 are coaxially arranged. The hollow shaft 9 passes through the second through-hole 11 and is axially movable. At least two sealing rings are spaced between the inner wall of the second through-hole 11 and the outer wall of the hollow shaft 9. Specifically, the inner wall of the second through-hole 11 is provided with an annular groove, and the sealing ring is installed in the annular groove. A ballast head 12 is integrally formed at the outer end of the hollow shaft 9. The side wall of the ballast head 12 is provided with a third through-hole 13 that connects to the interior of the hollow shaft 9. The inner end of the hollow shaft extends into the second through-hole and makes close contact with the sample.

[0020] On the left side of the housing 2, the ballast head 12 contacts the reaction wall plate 3. A third through-hole 13 on the ballast head 12 is connected via tubing to a device for collecting shale oil from the sample. On the right side of the housing 2, the ballast head 12 contacts the telescopic rod of the hydraulic cylinder 4. The third through-hole 13 on the ballast head 12 is connected via tubing to an oil injection device. The hydraulic cylinder 4 can apply axial pressure to the sample. Furthermore, the hydraulic cylinder 4 is equipped with a spoke-type pressure sensor 14 for detecting pressure and facilitating control of the axial pressure applied to the sample.

[0021] During the test, the produced shale oil was analyzed by changing the temperature, axial pressure on the sample, and hydraulic pressure on the right end face of the sample. This will help promote the development of underground in-situ heating technology for shale oil and provide theoretical support for practical applications.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. Shale oil in-situ heating and reforming test device, characterized in that: The invention comprises a shell having a cavity for loading a sample, an outer wall of the shell being wound with a heating coil, two opposite end faces of the shell being provided with ports, and a cover assembly being installed at each port position, the cover assembly comprising a sealing cover, an end cover and a hollow shaft, the sealing cover being connected to the shell and being used to seal the port, a first through hole being provided on the sealing cover, the end of the sample extending into the first through hole, the end cover being fixedly installed on the outer side surface of the sealing cover, a second through hole being provided on the end cover, the hollow shaft passing through the second through hole and being axially movable, at least two sealing rings being spaced apart between the inner wall of the second through hole and the outer wall of the hollow shaft, a ballast head being integrally formed with the outer end of the hollow shaft, a third through hole being provided on the side wall of the ballast head connecting to the interior of the hollow shaft, the inner end of the hollow shaft extending into the second through hole and in close contact with the sample, one of the ballast heads being coordinated with the hydraulic cylinder, and the other ballast head being coordinated with the reaction wall panel.

2. The shale oil in-situ heating and reforming test device according to claim 1, characterized in that: Several pairs of pillars are arranged at intervals in the shell, and each pair of pillars includes two pillars arranged opposite to each other to support the sample.

3. The shale oil in-situ heating and reforming test device according to claim 1, characterized in that: The hydraulic cylinder is equipped with a spoke-type pressure sensor.

4. The shale oil in-situ heating and reforming test device according to claim 1, characterized in that: The device also includes a base, and the shell is fixedly mounted on the base through a bracket.

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