阅读说明：本技术 用于核磁共振系统的页岩渗吸岩心夹持器 (Shale imbibition rock core holder for nuclear magnetic resonance system ) 是由 郎东江 伦增珉 吕成远 王海涛 赵清民 赵春鹏 周霞 潘伟义 于 2019-03-27 设计创作，主要内容包括：本发明公开了一种用于核磁共振系统的页岩渗吸岩心夹持器,包括：腔体组件,腔体组件包括腔体和管件,腔体内部设置有热源,管件内部用于放置岩心,管件嵌入腔体中；一对端座组件,一对端座组件用于封闭管件的两端,一对端座组件上分别设有流体注入管和流体回收管。本发明的夹持器能够与核磁共振静磁场射频线圈配合,在线高温、高压实时检测页岩渗吸核磁共振T2谱。(The invention discloses a shale imbibition core holder for a nuclear magnetic resonance system, which comprises: the cavity assembly comprises a cavity and a pipe fitting, a heat source is arranged in the cavity, the pipe fitting is used for placing a rock core, and the pipe fitting is embedded into the cavity; and the pair of end seat assemblies are used for closing two ends of the pipe fitting, and the pair of end seat assemblies are respectively provided with a fluid injection pipe and a fluid recovery pipe. The holder can be matched with a nuclear magnetic resonance static magnetic field radio frequency coil to detect the shale imbibition nuclear magnetic resonance T2 spectrum on line at high temperature and high pressure in real time.)

1. A shale imbibition core holder for a nuclear magnetic resonance system, comprising:

the cavity assembly comprises a cavity and a pipe fitting, a heat source is arranged in the cavity, the pipe fitting is used for placing a core, and the pipe fitting is embedded into the cavity;

the pair of end seat assemblies are used for sealing two ends of the pipe fitting, and a fluid injection pipe and a fluid recovery pipe are respectively arranged on the pair of end seat assemblies.

2. The shale imbibition core holder for a nuclear magnetic resonance system of claim 1, wherein a closed space is formed between an inner surface of the cavity and an outer surface of the tubular, the heat source being disposed in the closed space.

3. The shale imbibition core holder for a nuclear magnetic resonance system of claim 2, wherein the heat source is chlorofluorocarbon oil, an input pipe and an output pipe of the chlorofluorocarbon oil are respectively arranged on the side walls at two ends of the cavity, and the input pipe and the output pipe are connected to a constant temperature oil bath circulation system.

4. The shale imbibition core holder for a nuclear magnetic resonance system of claim 1, wherein each end seat assembly comprises an end seat and an end seat connecting piece, the end seat connecting piece is fixedly connected with the end seat, and the end seat is hermetically connected with the end of the cavity, so that the end seat connecting piece integrally extends into the pipe fitting to hold the core arranged in the pipe fitting.

5. The shale imbibition core holder for a nuclear magnetic resonance system of claim 4, wherein the end seat connecting piece is in threaded connection with the end seat, and an O-ring is arranged at the threaded connection of the end seat connecting piece and the end seat and used for sealing the pipe fitting.

6. The shale imbibition core holder for a nuclear magnetic resonance system of claim 4, wherein the end seat is connected with the cavity through a threaded pin, and the threaded pin is made of nonmagnetic metallic material titanium steel.

7. The shale imbibition core holder for a nuclear magnetic resonance system of claim 1, wherein the fluid injection tube is connected to a fluid pressure vessel and the fluid recovery tube is connected to a collection vessel.

8. The shale imbibition core holder for a nuclear magnetic resonance system of claim 7, wherein the fluid is carbon dioxide.

9. The shale imbibition core holder for a nuclear magnetic resonance system of claim 1, wherein the cavity assembly is made of a non-metallic material resistant to high temperature and high pressure.

10. The shale imbibition core holder for a nuclear magnetic resonance system of claim 1, wherein the end mount assembly is made of a nonmagnetic metallic material titanium steel.

Technical Field

The invention belongs to the field of unconventional oil field exploration and development rock core imbibition experimental devices, and particularly relates to a shale imbibition rock core holder for a nuclear magnetic resonance system.

Background

The imbibition is a process that a wetting phase fluid spontaneously enters rock pores under the action of capillary pressure and drives out a non-wetting phase fluid in the rock pores, and the imbibition research is mainly focused on a natural fractured low-permeability oil reservoir, is an effective means and method for researching and correctly knowing an imbibition mechanism of an oil reservoir, but is still in an exploration stage for shale reservoirs. The imbibition experiment is a process of putting a shale sample into a container containing a wetting phase fluid, driving out oil by the wetting phase fluid entering pores of the shale sample, and if the shale sample is put into the container containing the wetting phase fluid and is in a high-temperature and high-pressure state, the result of the shale sample imbibition experiment reflects a real imbibition process under a stratum condition.

Disclosure of Invention

The invention aims to provide a shale imbibition core holder for a nuclear magnetic resonance system, which can be used for analyzing a shale imbibition process and a shale imbibition result under a stratum condition on line in real time by using nuclear magnetic resonance equipment.

In order to achieve the above object, the present invention provides a shale imbibition core holder for a nuclear magnetic resonance system, comprising:

the cavity assembly comprises a cavity and a pipe fitting, a heat source is arranged in the cavity, the pipe fitting is used for placing a core, and the pipe fitting is embedded into the cavity;

the pair of end seat assemblies are used for sealing two ends of the pipe fitting, and a fluid injection pipe and a fluid recovery pipe are respectively arranged on the pair of end seat assemblies.

Preferably, an enclosed space is formed between an inner surface of the cavity and an outer surface of the pipe, the heat source being disposed in the enclosed space.

Preferably, the heat source is chlorofluorocarbon oil, an input pipe and an output pipe of the chlorofluorocarbon oil are respectively arranged on the side walls of the two ends of the cavity, and the input pipe and the output pipe are connected to the constant-temperature oil bath circulation system.

Preferably, each end seat assembly comprises an end seat and an end seat connecting piece, the end seat connecting piece is fixedly connected with the end seat, and the end seat is hermetically connected with the end part of the cavity, so that the end seat connecting piece integrally extends into the pipe fitting and clamps the core arranged in the pipe fitting.

Preferably, the end seat connecting piece is in threaded connection with the end seat, and an O-shaped ring is arranged at the threaded connection position of the end seat connecting piece and the end seat and used for sealing the pipe fitting.

Preferably, the end seat is connected with the cavity through a threaded pin, and the threaded pin is made of nonmagnetic metal material titanium steel.

Preferably, the fluid injection pipe is connected to a fluid pressure vessel and the fluid recovery pipe is connected to a collection vessel.

Preferably, the fluid is carbon dioxide.

Preferably, the cavity assembly is made of a non-metallic material resistant to high temperature and high pressure.

Preferably, the end seat assembly is made of nonmagnetic metal material titanium steel.

The invention has the beneficial effects that: the shale imbibition experiment method comprises the steps of firstly placing a shale core in a pipe fitting in a cavity assembly, clamping the core from two ends of the pipe fitting by using a pair of end seat assemblies, then placing a part where the shale core of the cavity assembly is located in nuclear magnetic resonance equipment, then injecting a wetting phase fluid from a fluid injection pipe on the end seat assembly at high pressure to simulate formation pressure, and heating the pipe fitting by using a heat source to simulate formation temperature, so as to carry out a shale imbibition experiment. The rock core holder can simulate high-temperature and high-pressure stratum conditions, can be used for placing the rock core in nuclear magnetic resonance equipment, analyzing the shale imbibition process and result under the stratum conditions in real time on line, is easy to assemble and disassemble, is acid-resistant and high-temperature-resistant, and can be recycled.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.

FIG. 1 shows a schematic block diagram of a shale imbibition core holder for a nuclear magnetic resonance system according to one embodiment of the invention.

Description of the reference numerals

1. A fluid injection tube; 2. an input tube; 3. an end seat; 4. a threaded pin; 5. an end seat connecting piece; 6. a pipe fitting; 7. a closed space; 8. a core; 9. a cavity; 10. a fluid recovery tube; 11. and (5) outputting the product.

Detailed Description

Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The shale imbibition core holder for the nuclear magnetic resonance system comprises:

the cavity assembly comprises a cavity and a pipe fitting, a heat source is arranged in the cavity, the pipe fitting is used for placing a rock core, and the pipe fitting is embedded into the cavity;

and the pair of end seat assemblies are used for closing two ends of the pipe fitting, and the pair of end seat assemblies are respectively provided with a fluid injection pipe and a fluid recovery pipe.

Specifically, firstly, a shale core is placed in a pipe fitting in a cavity assembly, the core is clamped by a pair of end seat assemblies from two ends of the pipe fitting respectively, then the part of the cavity assembly where the shale core is located is placed in a nuclear magnetic resonance device, then a wetting phase fluid is injected at high pressure from a fluid injection pipe on the end seat assembly to simulate formation pressure, a heat source is used for heating the pipe fitting to simulate formation temperature, and a shale imbibition experiment is carried out. The rock core holder can simulate high-temperature and high-pressure stratum conditions, can be used for placing the rock core in nuclear magnetic resonance equipment, analyzing the shale imbibition process and result under the stratum conditions in real time on line, is easy to assemble and disassemble, is acid-resistant and high-temperature-resistant, and can be recycled.

Preferably, a closed space is formed between the inner surface of the cavity and the outer surface of the pipe, and the heat source is disposed in the closed space.

Preferably, the heat source is fluorocarbon oil, the input pipe and the output pipe of the fluorocarbon oil are respectively arranged on the side walls at two ends of the cavity, and the input pipe and the output pipe are connected with the constant-temperature oil bath circulating system.

As the preferred scheme, each end seat assembly comprises an end seat and an end seat connecting piece, the end seat connecting pieces are fixedly connected with the end seats, the end seats are hermetically connected with the end parts of the cavities, so that the end seat connecting pieces integrally extend into the pipe fitting and clamp the core arranged in the pipe fitting.

As preferred scheme, end seat connecting piece passes through threaded connection with the end seat, and the threaded connection department of end seat connecting piece and end seat is provided with O shape circle for sealed pipe fitting.

As the preferred scheme, the end seat is connected with the cavity through a threaded pin, and the threaded pin is made of nonmagnetic metal material titanium steel.

Preferably, the fluid injection pipe is connected to the fluid pressure vessel, and the fluid recovery pipe is connected to the collection vessel.

Preferably, the fluid is carbon dioxide.

As the preferred scheme, the cavity body assembly is made of a high-temperature and high-pressure resistant non-metallic material.

As the preferred scheme, the end seat assembly is made of nonmagnetic metal material titanium steel.