Shale oil fracturing synchronous energizing simulation experimental device and method

Patent metadata

Field	Value
Publication number	US-2022298902-A1
Application number	US-202217654546-A
Country	US
Kind code	A1
Filing date	Mar 11, 2022
Priority date	Mar 16, 2021
Publication date	Sep 22, 2022
Grant date	—

Abstract

The present disclosure relates to the technical field of oil-gas field development, and discloses a shale oil fracturing synchronous energizing simulation experimental device and method. The shale oil fracturing synchronous energizing simulation experimental device comprises a liquid supply system, a confining pressure loading system, a fracturing system, an energizing system and a recovery system, wherein the liquid supply system is used for storing fluid and can inject the fluid into the fracturing system; the fracturing system can bear a test piece, receive the fluid injected by the liquid supply system and serve as seepage space of the fluid; the confining pressure loading system is used for providing simulated confining pressure for the test piece; the energizing system is used for simulating an energizing effect on a test piece after fracturing liquid is injected; and the recovery system is used for collecting discharged liquid and separating and metering the discharged liquid.

First claim

1 . A shale oil fracturing synchronous energizing simulation experimental device, comprising a liquid supply system, a confining pressure loading system, a fracturing system, an energizing system and a recovery system, wherein
the liquid supply system is used for storing fluid and can inject the fluid into the fracturing system; the fracturing system can bear a test piece, the fracturing system is used for simulating the rock medium of a tight reservoir and boundary conditions around the rock medium, receives the fluid injected by the liquid supply system and serves as a seepage space of the fluid, and the fracturing system is configured to be capable of maintaining own temperature; the confining pressure loading system is connected with the fracturing system and used for providing simulated confining pressure for the test piece, and the confining pressure loading system can maintain stable stress conditions in the horizontal and vertical directions for the test piece; the energizing system is connected with the fracturing system and used for simulating an energy supplementing effect on a formation after fracturing liquid is injected; and
the recovery system is used for collecting liquid discharged from the fracturing system, and the recovery system can control the pressure of the fracturing system (III) and separate and meter the discharged liquid.

2 . The shale oil fracturing synchronous energizing simulation experimental device according to claim 1 , wherein the liquid supply system comprises a plurality of liquid storage containers, the liquid storage containers are respectively used for storing different types of fluids, and the fluids in the liquid storage containers communicate with the fracturing system.

3 . The shale oil fracturing synchronous energizing simulation experimental device according to claim 2 , wherein at least one of the liquid storage containers is configured to be capable of controlling the internal pressure of the liquid storage container, and a flow meter is arranged on a pipeline between the liquid supply system and the fracturing system.

4 . The shale oil fracturing synchronous energizing simulation experimental device according to claim 1 , wherein the fracturing system comprises movable loading plates, the loading plates are arranged around the test piece, and the confining pressure loading system is connected with the loading plates so as to provide confining pressure for the test piece.

5 . The shale oil fracturing synchronous energizing simulation experimental device according to claim 4 , wherein the confining pressure loading system comprises a large true triaxial loading servo supercharger, a true triaxial loading instrument hydraulic source and a true triaxial loading instrument controller, the true triaxial loading instrument hydraulic source is in fluid connection with the large true triaxial loading servo supercharger so as to provide a hydraulic source for the large true triaxial loading servo supercharger,
the true triaxial loading instrument controller is connected with the large true triaxial loading servo supercharger, and the large true triaxial loading servo supercharger is connected with the loading plates so as to provide confining pressure for the test piece.

6 . The shale oil fracturing synchronous energizing simulation experimental device according to claim 1 , wherein the test piece is a core sample for a shale oil reservoir, and the core sample for a shale oil reservoir is arranged in the fracturing system so as to simulate a shale medium of a shale oil reservoir and boundary conditions around the shale medium of the shale oil reservoir.

7 . The shale oil fracturing synchronous energizing simulation experimental device according to claim 1 , wherein the fracturing system comprises warmers and acoustic emission probes, the warmers are connected with the test piece so as to control the temperature of the test piece, and the acoustic emission probes are arranged around the test piece so as to monitor the damage condition of the test piece.

8 . The shale oil fracturing synchronous energizing simulation experimental device according to claim 1 , wherein the energizing system comprises a high-pressure energy storage tank, the high-pressure energy storage tank is filled with a constant-pressure medium located on the upper portion and an energizing fluid located on the lower portion, and the lower portion of the high-pressure energy storage tank is connected with the fracturing system so as to simulate an energizing effect after fracturing liquid is injected.

9 . The shale oil fracturing synchronous energizing simulation experimental device according to claim 1 , wherein the recovery system comprises a back pressure valve, a back pressure pump, a buffer tank and an oil-water separation device, the back pressure valve is connected with the output end of the fracturing system, and the oil-water separation meter is connected with the back pressure valve so as to collect, separate and meter liquid extracted from the fracturing system; and the back pressure pump is connected with the back pressure valve through the buffer tank so as to control bottom hole pressure in the production process.

10 . A shale oil fracturing synchronous energizing simulation experimental method, wherein the method uses the shale oil fracturing synchronous energizing simulation experimental device according to claim 1 , and the method comprises the following steps:
a preparation stage: injecting crude oil into the test piece in a fracturing system so that the internal pressure of the fracturing system reaches a preset pressure P1, and recording the volume V1 of the injected crude oil; heating a core sample for a shale oil reservoir for simulating a shale medium of a shale oil reservoir and boundary conditions around the shale medium of the shale oil reservoir to a preset temperature T1, and stabilizing the test piece for a period of time t1; a fracturing stage: injecting fracturing liquid into the fracturing system through a liquid supply system for a fracturing experiment in which the injection time of the fracturing liquid is t2, and metering the volume V2 of the injected fracturing liquid; a soak stage: starting the energizing system so as to maintain the pressure of the fracturing system at P1, maintaining the fracturing system at the temperature T1 so that the shale oil fracturing synchronous energizing simulation experimental device is stabilized for a period of time t3 and the crude oil and the fracturing liquid in the test piece form a mixed fluid; a recovery stage: controlling the pressure of the fracturing system to be P2 through the recovery system, and separating and metering the mixed fluid through the recovery system to obtain primary extracted crude oil and fracturing liquid; metering the volume V3 of the primary extracted crude oil and the volume V4 of the extracted fracturing liquid; and an oil recovery agent huff-n-puff stage: closing the recovery system, injecting the oil recovery agent into the fracturing system by utilizing the liquid supply system, performing oil recovery agent huff and puff so that the pressure in the fracturing system reaches P3 and the shale oil fracturing synchronous energizing simulation experimental device is stabilized for a period of time t4; opening the recovery system, reducing the pressure of the fracturing system to P4, and collecting liquid in the fracturing system to the recovery system; separating the extracted liquid through the recovery system to obtain secondary extracted crude oil and an oil recovery agent; and metering the volume V5 of the secondary extracted crude oil and the volume V6 of the oil recovery agent.

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Assignees

• Univ China Petroleum East China

Inventors

• Wang Sen
• Feng Qihong
• Wang Yichun
• Zhang Xianmin
• Zhang Jiyuan
• Shi Xian

Classifications

• G01N2203/0067

  Fracture or rupture · CPC title

• G01N3/12

  Pressure testing · CPC title

• E21B41/00 Primary

  Equipment or details not covered by groups E21B15/00 - E21B40/00 · CPC title

• E21B43/26 Primary

  by forming crevices or fractures · CPC title

• E21B49/087

  Well testing, e.g. testing for reservoir productivity or formation parameters · CPC title