CN-224228657-U - Experimental device for simulating depth of invasion of working fluid dynamic into stratum

CN224228657UCN 224228657 UCN224228657 UCN 224228657UCN-224228657-U

Abstract

The utility model discloses an experimental device for simulating the depth of an intrusion of working fluid into a stratum, which comprises a pressure unit, a special long core holder and a data acquisition unit, wherein the special long core holder comprises a holder cylinder body, a high-pressure-resistant rubber sleeve is arranged in the holder cylinder body, rubber sleeve plugs and rubber sleeve supports are arranged at two ends of the high-pressure-resistant rubber sleeve, the pressure unit comprises a pressure supply assembly and a pressure release assembly, the pressure supply assembly comprises a high-precision displacement pump and a piston type middle container, the pressure release assembly comprises a pressure return pump and a liquid collection device, the data acquisition unit comprises a data collection control device, the data collection control device is electrically connected with a hydraulic pressure transmission sensor, a hydraulic pressure discharge sensor, a bridge instrument and a temperature control device, and a plurality of electrode pairs are axially arranged on the outer wall of the high-pressure-resistant rubber sleeve. The utility model can be adapted to cores with different sizes, can accurately simulate the core experiment environment, and can accurately experiment the depth of the invasion of the working fluid into the stratum.

Inventors

XIONG JIAN
QIAN CHANG
HE ZHIXUAN
HAN KUN
GAN YULONG
Che Yongao
BAI JINDE

Assignees

西南石油大学

Dates

Publication Date: 20260512
Application Date: 20250110

Claims (6)

1. An experimental device for simulating the depth of invasion of working fluid into stratum is characterized by comprising a pressure unit, a specially-made long core holder and a data acquisition unit; The special long core holder comprises a holder barrel (1) which is horizontally arranged, the holder barrel (1) is communicated with a confining pressure device (2) and an air compressor (3), a high-pressure resistant rubber sleeve (4) is coaxially arranged in the holder barrel (1), two ends of the high-pressure resistant rubber sleeve (4) are connected with a rubber sleeve support (6) through a rubber sleeve plug (5), a temperature control device (7) is arranged on the inner wall of the holder barrel (1), the rubber sleeve support (6) is clamped and fixed in the temperature control device (7), a barrel opening plug (8) is detachably and hermetically connected with the head end of the holder barrel (1), a barrel tail plug (9) is detachably and hermetically connected with the tail end of the holder barrel (1), a transfusion pipeline (10) penetrates through the barrel opening plug (8), the rubber sleeve support (6) and the rubber sleeve plug (5) to be communicated with the high-pressure resistant rubber sleeve (4), and a liquid discharge pipeline (11) penetrates through a barrel tail plug (9), the rubber sleeve support (6) and the rubber sleeve plug (5) to be communicated with the high-pressure resistant rubber sleeve (4); The pressure unit comprises a pressure supply assembly and a pressure relief assembly, wherein the pressure supply assembly comprises a high-precision displacement pump (12) and a piston type intermediate container (13) which are sequentially communicated, the piston type intermediate container (13) is communicated with the infusion pipeline (10), the pressure relief assembly comprises a back pressure pump (14) and a liquid collecting device (15) which are sequentially communicated, and the back pressure pump (14) is communicated with the liquid discharge pipeline (11); the data acquisition unit comprises a data acquisition control device (16), the data acquisition control device (16) is electrically connected with a hydraulic pressure sensor (17), a hydraulic pressure discharge sensor (18), an electric bridge instrument (19) and a temperature control device (7), the electric bridge instrument (19) is electrically connected with an electrode controller (20), the electrode controller (20) is electrically connected with an electrode pair (22) through an electrode cluster (21), the hydraulic pressure sensor (17) is communicated with a liquid delivery pipeline (10), the hydraulic pressure discharge sensor (18) is communicated with a liquid discharge pipeline (11), and a plurality of electrode pairs (22) are axially arranged on the outer wall of the high-pressure-resistant rubber sleeve (4).
2. The experimental device according to claim 1, wherein the electrode cluster (21) is fixedly arranged in the nozzle plug (8).
3. The experimental device according to claim 1, wherein the data collection control device (16) is electrically connected with the hydraulic transmission pressure sensor (17) and the drainage pressure sensor (18) through the pressure sensing controller (23).
4. The experimental device according to claim 1, wherein the bottom of the holder barrel (1) is communicated with the confining pressure device (2), and the top of the holder barrel (1) is communicated with the air compressor (3).
5. The experimental apparatus as set forth in claim 1, wherein the total number of the electrode pairs (22) is 13, the adjacent distances of the first to eighth electrode pairs (22) are the same, and the adjacent distances of the eighth to thirteenth electrode pairs (22) are the same and half of the adjacent distances of the first to eighth electrode pairs (22).
6. The experimental device according to claim 1, wherein the back pressure pump (14) is communicated with the liquid discharge pipeline (11) through a back pressure device (24).

Description

Experimental device for simulating depth of invasion of working fluid dynamic into stratum Technical Field The utility model relates to the field of experimental devices, in particular to an experimental device for simulating the depth of invasion of working fluid into stratum. Background Multi-section horizontal well fracturing has become an important mode for developing a tight oil reservoir, fracturing fracture-making can greatly enhance seepage capability of the oil reservoir, oil reservoir recovery ratio is improved, and fracturing effect evaluation also becomes an important link for developing the tight oil reservoir. The invasion depth of the fracturing fluid is not only related to the wave area of the fracturing fluid, but also is a parameter which must be considered in the subsequent flowback production, and plays a certain role even when the imbibition area is considered in the well closing stage. Thus, invasion depth is certainly an important indicator of fracturing effectiveness. However, the fracturing process is affected by various geological and engineering factors, and the invasion depth of the fracturing fluid under different pressures and different times has a certain difference, so that the calculation of the invasion depth is difficult to obtain an accurate value. Disclosure of utility model The utility model aims to provide an experimental device for simulating the depth of the invasion of the working fluid into the stratum, which can be adapted to cores with different sizes, can accurately simulate the core experimental environment and can accurately perform experiments on the depth of the invasion of the working fluid into the stratum. In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme: The utility model discloses an experimental device for simulating the depth of invasion of working fluid into stratum, which comprises a pressure unit, a specially-made long core holder and a data acquisition unit, wherein the pressure unit is used for measuring the depth of invasion of the working fluid into stratum; the special long core holder comprises a holder barrel body which is horizontally arranged, the holder barrel body is communicated with a confining pressure device and an air compressor, a high-pressure resistant rubber sleeve is coaxially arranged in the holder barrel body, two ends of the high-pressure resistant rubber sleeve are connected with a rubber sleeve support through a rubber sleeve plug, a temperature control device is arranged on the inner wall of the holder barrel body, the rubber sleeve support is clamped and fixed in the temperature control device, a barrel opening plug is detachably and hermetically connected with the head end of the holder barrel body, a barrel tail plug is detachably and hermetically connected with the tail end of the holder barrel body, a transfusion pipeline penetrates through the barrel opening plug, the rubber sleeve support and the rubber sleeve plug and is communicated with the high-pressure resistant rubber sleeve, a liquid discharge pipeline penetrates through the barrel tail plug, the rubber sleeve support and the rubber sleeve plug and is communicated with the high-pressure resistant rubber sleeve, the pressure supply assembly comprises a high-precision displacement pump and a piston type intermediate container which are sequentially communicated, the piston type intermediate container is communicated with the transfusion pipeline, the pressure release assembly comprises a back pressure pump and a liquid collecting device which are sequentially communicated, the back pressure pump is communicated with the liquid discharge pipeline, the data collecting unit comprises a data collecting control device, the data collecting control device is electrically connected with a hydraulic pressure sensor, a discharge pressure sensor, a bridge instrument and an electrode controller, and the device, the electrode controller are connected with the electrode in turn, and the electrode controller are connected with the liquid discharge pump through the electrode sensor and the electrode sensor, and the electrode controller are communicated with the high-pressure resistant rubber sleeve through the pipeline and the high-pressure resistant rubber sleeve. Preferably, the electrode cluster is fixedly arranged in the nozzle plug. Preferably, the data collection control device is electrically connected with the hydraulic transmission pressure sensor and the hydraulic discharge pressure sensor through the pressure sensing controller respectively. Preferably, the bottom of the holder barrel is communicated with the confining pressure device, and the top of the holder barrel is communicated with the air compressor. Preferably, the number of electrode pairs is 13, the adjacent distances of the first to eighth electrode pairs are the same, and the adjacent distances of the eighth to thirteenth electrode pairs ar