CN103790564B - Hot-dry rock fracturing high-pressure recovery-ratio-increasing laboratory simulation device - Google Patents

Abstract

The invention provides a laboratory simulation device for hot dry rock fracturing high-pressure extraction. The device includes a fracturing fluid injection system, a proppant injection system, a high-pressure gas booster injection system, a fracturing body, a ring pressure application system, and a high-pressure pipe valve; the proppant injection system includes indirect injection and solidification of the proppant; The pressure injection system includes gas pressurization and gas indirect injection; the fracturing main body includes the sample fracturing chamber and the sample ring pressure chamber; the fracturing chamber includes a three-dimensional fixed support and a three-dimensional hydraulic system; the three-dimensional hydraulic system includes a hydraulic sliding chamber and a hydraulic movable plug; The sample ring pressure chamber includes a ring pressure chamber steel plate and a rubber sleeve. There is a cavity between the rubber sleeve and the steel plate, and liquid is injected to realize the pressure wrapping effect. The invention adopts the combined structure of split modules, which ensures that the fracturing samples are kept intact and the proppant is injected accurately, and the high-pressure gas is injected for replacement and multiplication, so as to improve the recovery rate. It has the characteristics of novel structure, safety and durability.

Description

A laboratory simulation device for hot dry rock fracturing high pressure enhanced oil recovery

technical field

The invention relates to a laboratory simulation device for hot dry rock fracturing high-pressure enhanced oil recovery, in particular to a simulation test device for hot dry rock fracturing and heat exchange displacement replacement simulation test device, in particular to a hot dry rock fracturing High pressure enhanced oil recovery laboratory simulation device.

Background technique

At present, the development and utilization of hot dry rock resources, which account for a large proportion, are relatively small. In the face of the current energy shortage, especially the serious shortage of resources, it is necessary to increase the recovery rate of thermal energy resources while exploiting huge thermal energy resources. The comprehensive utilization efficiency of thermal energy resources is particularly important.

The proven reserves of hot dry rock resources are equivalent to about 30 times the capacity of oil, natural gas and coal. Therefore, there is a need for a fracturing production device that can conduct in-situ research on the failure mechanism and extension law of reservoir fracturing, and more accurately reflect the actual situation, so as to improve the in-depth understanding of the above problems, so that this technology be more widely applied.

At present, domestic hydraulic fracturing equipment is mostly used for coal seam fracturing, and formation rock fracturing for oil recovery, mostly used for fracturing and research on fracture systems. The research methods also range from visual drawing to paint, fluorescence, etc. As for the post-fracturing testing and research, no post-fracturing injection-production and enhanced recovery studies have been carried out, and no further research on thermal energy recovery rate has been conducted to achieve an objective evaluation of recovery efficiency.

Contents of the invention

Purpose of the invention: In order to solve the above problems, the present invention provides a laboratory simulation device for high-pressure EOR laboratory simulation of hot dry rock fracturing.

Technical scheme: in order to achieve the above object, the present invention adopts following technical scheme:

A high-pressure EOR laboratory simulation device for hot dry rock fracturing, including a fracturing fluid injection system, a proppant injection system, a high-pressure gas pressurized injection system, a fracturing main body, a ring pressure application system, and a high-pressure pipe valve; The proppant injection system includes proppant indirect injection and solidification; the high-pressure gas pressurization injection system includes gas pressurization and gas indirect injection; the fracturing main body includes a sample fracturing chamber and a sample ring pressure chamber; the sample The fracturing chamber includes a three-dimensional fixed support and a three-dimensional hydraulic system; the three-dimensional hydraulic system includes a hydraulic sliding chamber and a hydraulic movable plug; the sample ring pressure chamber includes a ring pressure chamber steel plate and a rubber sleeve, and there is a gap between the rubber sleeve and the steel plate. The cavity is injected with liquid to achieve pressure wrapping; the injection of fracturing fluid and the application of ring pressure are both realized through the connection of high-pressure pipelines and high-pressure control components.

Preferably, the sample fracturing chamber adopts three-dimensional fixed support and three-dimensional hydraulic movable support.

As a preference, the hydraulic movable plug is made of high-quality tetrafluoroethylene material.

Preferably, the ring pressure is established through the cavity formed by the connection of the outer steel plate and the rubber sleeve.

Preferably, the ring pressure is established through the cavity formed by the connection of the outer steel plate and the rubber sleeve, and the wrapping of the periphery of the model body is achieved by applying pressure to the cavity.

As a preference, the operations of fracturing fluid, heat exchange fluid, high-pressure injection fluid, proppant fluid, and confining pressure are all connected through high-pressure valves and pipelines, and through their joint operations, they coordinate opening and closing to realize fracturing and pressurization. Injection, high temperature and high pressure environment simulation, and connected with associated pressure, temperature, and monitoring instruments.

Beneficial effects: At the same time of thermal injection production, the maximum recovery of thermal energy can be realized through the existing technology, and the drilling and reproduction function of high-pressure gas can greatly improve the thermal recovery rate, and reduce the production rate under the same mining conditions. cost.

Description of drawings

Fig. 1 is a flowchart of a laboratory simulation device for high-pressure enhanced oil recovery in hot dry rock fracturing according to the present invention.

detailed description

Example:

A laboratory simulation device for high-pressure EOR laboratory simulation of hot dry rock fracturing as shown in Figure 1, including a fracturing fluid injection system, a proppant injection system, a high-pressure gas pressurized injection system, a fracturing main body, and a ring pressure application system , high-pressure pipe valve parts; the proppant injection system includes proppant indirect injection and solidification; the high-pressure gas pressurized injection system includes gas pressurization and gas indirect injection; the fracturing main body includes a sample fracturing chamber and a sample ring pressure chamber; the fracturing chamber includes a three-dimensional fixed support and a three-dimensional hydraulic system; the three-dimensional hydraulic system includes a hydraulic sliding chamber and a hydraulic movable plug; the sample ring pressure chamber includes a ring pressure chamber steel plate and a rubber sleeve, and the rubber sleeve and the steel plate There is a cavity between them, and the fluid is injected to realize the pressure wrapping effect; the injection of the fracturing fluid and the application of the ring pressure are both realized by connecting the high-pressure pipeline and the high-pressure control component.

As shown in Figure 1, high-pressure fracturing pump 1, fracturing fluid container 2, proppant injection container 3, gas booster container 4, gas booster container 5, gas booster pump 6, model process data measurement 7, hydraulic control Device 8, hydraulic servo system 9, model main body 10, ring pressure application system 11, system pressure control and recovery 12, mixer 13.

The hot dry rock fracturing high-pressure EOR laboratory simulation device of the present invention includes a fracturing power system composed of a fracturing pump and a reversing system. The fracturing fluid is injected into a sample through a through hole on a hydraulic plug through a valve. Prior to this, the application of the hydraulic servo system 9 in the three-dimensional direction of the sample must be adjusted by the hydraulic controller 8 . Fracturing pressure is obtained through sensors. After fracturing, keep the applied force constant, apply the ring pressure module to the overall periphery, and inject the ring pressure through the ring pressure pump, and the ring pressure is 1.1-1.2 times the heat exchange pressure. At the same time, the pressure stability control of the system is carried out through the system pressure control and recovery 12. After the control pressure is set, the heat exchange enhanced oil recovery experiment is carried out. The heat exchange test production fluid (or proppant) is injected into the sample from the proppant injection container 3 through the pipeline, and the heat exchange test production fluid (or proppant) is subjected to high temperature simulation (aging effect) through the heating device of the model main body 10, and the high pressure gas Through the gas booster containers 4 and 5, the gas booster pump 6 boosts the pressure to form a high pressure, enters the model body 10 through the mixer 13 for full replacement and multiplication, forms a high temperature and high pressure environment, and injects into the mining area again through the fracturing fluid container 2 Liquid, large flow rate and rapid heat exchange, realize thermal recovery of samples and increase thermal recovery rate.

In the above-mentioned simulation system device, the three-phase applied force of the model can be adjusted according to the needs, and the gasket is selected according to the displacement of the active surface of the applied force.

When using the simulation system device of the present invention for heat exchange and displacement experiments, the pressure must be released slowly after the experiment is over, and the experimental components can only be disassembled after the temperature is lowered.

After the experiment is completed, clean the inside of the model body, valves, containers, etc., and the cleaning liquid passes through the pipeline valves, vents, and repeats the cleaning 2-3 times before entering the next experiment.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (5)

1. a kind of hot dry rock pressure break high pressure improves recovery ratio laboratory simulation device, it is characterised in that：It is including fracturing fluid injection System, proppant injected system, gases at high pressure supercharging injected system, pressure break main body, ring pressure application system, high pressure pipe valve；It is described Proppant injected system includes proppant injection and solidification indirectly；Gases at high pressure supercharging injected system include gas boosting and Gas injects indirectly；The pressure break main body includes sample pressure break storehouse and sample loop pressure chamber；The sample pressure break storehouse includes three-dimensional solid It is fixed to support and three-dimensional hydraulic system；The three-dimensional hydraulic system includes hydraulic pressure sliding cavity and hydraulic pressure motion stops；The sample loop pressure Chamber includes that ring presses chamber steel plate and gum cover, has cavity between gum cover and steel plate, and injection liquid realizes pressure package action；Fracturing fluid Injection applies to be connected to realize with high voltage control component by high pressure line with ring pressure.

2. a kind of hot dry rock pressure break high pressure according to claim 1 improves recovery ratio laboratory simulation device, and its feature exists In：The sample pressure break storehouse is using three-dimensional fixed support and three-dimensional hydraulic movable supporting.

3. a kind of hot dry rock pressure break high pressure according to claim 1 improves recovery ratio laboratory simulation device, and its feature exists In：The hydraulic pressure motion stops adopt high-quality PTFE.

4. a kind of hot dry rock pressure break high pressure according to claim 1 improves recovery ratio laboratory simulation device, and its feature exists In：The foundation of ring pressure is connected the cavity of generation by external steel plate with gum cover.

5. a kind of hot dry rock pressure break high pressure according to claim 4 improves recovery ratio laboratory simulation device, and its feature exists In：By realizing the parcel to model ontology periphery to the pressure of cavity.