CN211115949U - Shale gas well crack simulation system - Google Patents
Shale gas well crack simulation system Download PDFInfo
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- CN211115949U CN211115949U CN201921666410.4U CN201921666410U CN211115949U CN 211115949 U CN211115949 U CN 211115949U CN 201921666410 U CN201921666410 U CN 201921666410U CN 211115949 U CN211115949 U CN 211115949U
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Abstract
The utility model provides a shale gas well crack analog system. The system may include: the device comprises a semi-closed shell, a cover plate and a rock plate, wherein the semi-closed shell is provided with a cavity, the cavity forms an opening on the outer surface of the shell, the bottom of the cavity is provided with X groups of pore channels, each group of pore channels comprises an outer pore channel and a pressure measuring pore channel which penetrate through the shell, and the semi-closed shell is also provided with an inlet channel and an outlet channel which communicate the outside with the cavity and face each other; the cover plate covers the opening of the semi-closed shell; the rock plate is arranged in the cavity, one surface of the rock plate is connected with the bottom surface of the cavity, and X inner pore channels corresponding to the outer pore channels are arranged on the rock plate; the cavity, the rock plate and the cover plate are enclosed to form a laying belt, and the inlet channel and the outlet channel are communicated with the laying belt. The utility model discloses beneficial effect can include: the device has simple structure and scientific and reasonable design; the simulation of gas-liquid fluid in the shale gas well can be realized; the experimental support can be provided for the prediction technology of the dynamic pressure field of the gas well.
Description
Technical Field
The utility model relates to an unconventional oil and gas reservoir yield increase reforms transform technical field, especially, relates to a shale gas well crack analog system.
Background
In order to increase clean energy supply, optimize and adjust an energy structure and meet the requirements of rapid development of economic society, continuous improvement of the living standard of people and green low-carbon environment construction, the shale gas exploration and development strength and depth are inevitably improved on the basis of great breakthrough in the former period. However, due to the influence of geological characteristics of the shale reservoir, the stable production capacity after the horizontal well pressure of the shale gas is poor, and the yield is decreased quickly. In order to meet the requirement of capacity construction, the capacity decreasing gap of the gas well at the early stage is usually compensated by newly increasing the number of drilled wells, because the later-stage development well is usually close to the bottom of the well at the early stage, the later-stage development well is influenced by the factors such as a pressure drop funnel formed by the early-stage production well, the natural shale crack and the like, inter-well communication with the early-stage production well is generated in the yield increasing and improving process of the later-stage development well, and further the gas producing effect of the early-stage production well and the improving effect of the fracturing and improving well are influenced.
Currently, research aiming at simulation of gas-liquid two-phase flow in a fracture is carried out by a numerical model and a well testing model of coupling of gas-liquid two-phase flow of a shaft and formation seepage; in the field of indoor experiments, simulation evaluation is only carried out on flow characteristics of multiphase flow in cracks under different scale conditions (macro-scale natural cracks and micro-scale cracks), and no physical simulation experiment evaluation device for flow interference in cracks under the conditions of hydraulic cracks-natural cracks and multi-scale cracks exists, for example, no shale gas well (such as a fracturing well) crack simulation device capable of being used for physical simulation experiments of flow interference in cracks under the conditions of hydraulic cracks-natural cracks and multi-scale cracks exists.
SUMMERY OF THE UTILITY MODEL
To the not enough that exist among the prior art, the utility model aims to solve one or more problems that exist among the above-mentioned prior art. For example, one of the objectives of the present invention is to provide a shale gas well fracture simulation system that can be used for gas-liquid two-phase flow simulation in multi-scale fractures.
In order to achieve the purpose, the utility model provides a shale gas well crack analog system.
The system may include: the device comprises a semi-closed shell, a cover plate and a rock plate, wherein the semi-closed shell is provided with a cavity, an opening is formed in the outer surface of the shell by the cavity, X groups of pore passages distributed along a first direction are formed in the bottom of the cavity, each group of pore passages comprise an outer pore passage and a pressure measuring pore passage which penetrate through the semi-closed shell, an inlet channel and an outlet channel which communicate the outside with the cavity and face each other are further arranged on the semi-closed shell, the axes of the inlet channel and the outlet channel are perpendicular to the opening direction of the cavity, the first direction is the direction from the inlet channel to the outlet channel, and X is an integer larger than 1; the cover plate covers the opening of the semi-closed shell; the rock plate is arranged in the cavity, one surface of the rock plate is connected with the bottom surface of the cavity, X inner channels which are distributed along the first direction and can correspond to the outer channels are arranged on the rock plate, the inner channels penetrate through the two surfaces of the rock plate, and the axes of the outer channels and the inner channels which are in corresponding relation in pairs are on the same straight line and jointly form a pipeline connecting channel; the cavity, the rock plate and the cover plate enclose a laying belt, and an inlet channel and an outlet channel of the semi-closed shell are communicated with the laying belt.
According to an exemplary embodiment of the present invention, the system may further comprise a proppant disposed in the layup belt.
According to an exemplary embodiment of the present invention, the cover plate and the semi-enclosed housing are connected by a plurality of fixing members.
According to an exemplary embodiment of the present invention, the system may further include a base capable of placing the housing and a lifting mechanism for supporting the base, the lifting mechanism including at least two lifting columns connected to different positions of the bottom surface of the base.
According to an exemplary embodiment of the invention, the sealing between the rock plate and the adjacent cavity wall of the semi-enclosed casing may be performed by a sealing element.
According to an exemplary embodiment of the present invention, the face of the rock facing the opening is an artificially etched rough face.
According to an exemplary embodiment of the present invention, the system may further comprise a heating unit, which is capable of heating the semi-enclosed housing.
According to an exemplary embodiment of the invention, the heating unit may comprise a heating jacket, the semi-enclosed housing being arrangeable within the heating jacket.
According to an exemplary embodiment of the present invention, the outer bore and the inner bore may have the same bore diameter.
According to an exemplary embodiment of the present invention, one or more visualization windows may be provided on the cover plate.
Compared with the prior art, the beneficial effects of the utility model can include: the device has simple structure and scientific and reasonable design; the simulation of gas-liquid fluid in the shale gas well can be realized; the experimental support can be provided for the prediction technology of the dynamic pressure field of the gas well.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a schematic cross-sectional view of a seam height-width plane of a shale gas well fracture simulation system of the present invention;
fig. 2 shows a top view of the cover plate of the present invention;
fig. 3 shows a top view of the semi-enclosed housing of the present invention;
figure 4 shows a schematic view of the base and support post of the present invention;
description of the main reference numerals:
10-semi-closed shell, 11 cavity, 12-outer pore channel, 13-pressure measuring pore channel, 14-inlet channel, 15-outlet channel, 16-groove and 17-shell connecting pore channel; 20-cover plate, 21-visual window, 22-cover plate connecting pore channel; 30-rock plate, 31-inner hole; 40-laying a belt; 50 a fixing member; 60-a base; 70-lifting column.
Detailed Description
Hereinafter, the shale gas well fracture simulation system of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
The utility model discloses a shale gas well crack analog system can be used for the simulation of production well crack, also can be used to the simulation of fracturing well crack. In other words, the utility model discloses a shale gas well analog system can be one side has the producing well fracture analog system of fracture, also can be fracturing well fracture analog system.
In an exemplary embodiment of the present invention, as shown in fig. 1, the shale gas well fracture simulation system may include a semi-enclosed casing 10, a cover plate 20, and a rock plate 30. Wherein the content of the first and second substances,
the semi-enclosed housing 10 may have a cavity 11 that forms an opening in the outer surface of the housing. The bottom of the cavity is provided with X groups of pore channels distributed along the first direction, and each group of pore channels comprises an outer pore channel 12 and a pressure measuring pore channel 13 which penetrate through the semi-closed shell. The semi-closed shell 10 is further provided with a fluid inflow channel (i.e. an inlet channel 14) and a fluid outflow channel (i.e. an outlet channel 15) which communicate the outside with the cavity and face each other, wherein the axes of the inlet channel 14 and the outlet channel 15 are perpendicular to the opening direction of the cavity 11, and the inlet channel 14 and the outlet channel 15 can respectively form an inlet end and an outlet end of the shale gas well fracture simulation system. The first direction is the direction from the inlet channel 14 to the outlet channel 15, X being an integer greater than 1.
The cover plate 20 covers the opening of the semi-hermetic case 10. The cover plate 20 and the semi-closed housing 10 may be connected by a fixing member 50. The fixing member 50 may include fastening bolts, and the number of the fastening bolts may be determined according to actual circumstances.
The rock plate 30 is disposed in the cavity 11 and one face of the rock plate 30 is connected to the bottom face of the cavity 11. The rock plate 30 is provided with X inner pore channels 31 which are distributed along a first direction and can respectively correspond to the outer pore channels 12, the inner pore channels 31 penetrate through two plate surfaces of the rock plate 30, and the axes of the outer pore channels 12 and the inner pore channels 31 which are in corresponding relation in pair are on the same straight line.
The chamber 11, the rock plate 30 and the cover plate 20 enclose an imbricated strip 40, the inlet channel 14 and the outlet channel 15 of the semi-closed housing 10 communicating with the imbricated strip 40.
In this embodiment, the shale gas well fracture simulation system further comprises a proppant disposed in the paved area 40.
In this embodiment, as shown in fig. 1, the outer pore passage 12 and the inner pore passage 31 in the corresponding relationship together form a pipeline connecting pore passage, the pipeline connecting pore passage may be connected to the production well fracture simulation system through a pipeline, the pipeline connecting the pore passage may be a high pressure resistant pipeline, and the pipeline may further be provided with an adjusting valve, such as a switch valve. The outer diameter of the pressure-resistant pipeline can be 5mm, the inner diameter can be 3mm, and the maximum pressure-bearing capacity can be 5 MPa.
In this embodiment, the surface of the rock 30 facing the cover plate 20 is a rough surface that is manually etched.
In this embodiment, fig. 2 shows a schematic top view of the cover plate (in this case, the cover plate is not mounted on the housing and is horizontally disposed).
The cover plate 20 may be provided with one or more visualization windows 21, for example, 8 visualization windows 21 shown in fig. 2, for observing fluid flow changes in a shale gas well (e.g., a fractured well), for example, the flow state of fluid in a fracture under an interwell communication condition.
In the present embodiment, the shale gas well fracture simulation system may further include a base 60 and a support column 70 as shown in fig. 4. The housing 10 can be placed on the base 60, the base 60 can be supported by a plurality of support columns 70, the support columns 70 can be hydraulic full-automatic lifting columns, the number of the support columns 70 is at least two, for example, in the case that the bottom of the base 60 is rectangular, the support columns 70 can be lifting columns and the number thereof is four, and the four lifting columns can be respectively disposed at four corners of the bottom of the base.
In this embodiment, the system may further comprise a heating unit capable of heating the semi-enclosed housing 10. The heating unit may include a heating jacket, and the maximum heating temperature of the heating jacket may be 150 ℃.
In this embodiment, the system may further comprise a pressure monitoring unit which may comprise an inlet pressure gauge and an outlet pressure gauge.
Wherein the inlet pressure gauge is capable of monitoring the pressure of fluid flowing into the shale gas well fracture simulation system; the first inlet pressure gauge may be provided in the inlet passage 14 of the housing 10 or on a line connected to the inlet passage 14.
The outlet pressure gauge can monitor the pressure of fluid flowing out of the shale gas well fracture simulation system; the outlet end pressure gauge may be provided on the outlet passage 15 of the housing 10 or a line connected to the outlet passage 15.
In this embodiment, the pressure monitoring unit may further include a plurality of pressure sensors, so as to test pressure variation of the shale gas well along the length direction of the fracture under the simulation of the inter-fracture interference.
The pressure sensors are arranged in the pressure measuring hole channels 13 and can monitor the pressure in the pressure measuring hole channels, and the number of the pressure sensors can be the same as that of the pressure measuring hole channels 13.
In the present embodiment, and as just one example, the semi-enclosed housing 10 may be sized 550mm × 340mm × 50mm, the semi-enclosed housing closure profile may be sized 550mm × 0340mm × 20mm (thickness), the semi-enclosed housing internal cavity 11 may be sized 450mm × 240mm × 30mm, the channel 16 may be sized 10mm × 500mm × 290mm the cover plate may be sized 550mm × 340mm × 30mm, and the visualization window may be sized 72mm × 72 mm.
Fig. 3 shows a top view of a semi-enclosed housing 10 (with the cover not attached to the housing and the housing opening facing upward). as shown in fig. 3, the semi-enclosed housing has a central axis with 5 sets of 10 openings along its length, each opening being sized at 5mm (hole diameter) × 30mm (length).
As shown in fig. 2, the cover plate 20 may further have a plurality of cover plate connecting holes 22, and as shown in fig. 3, the semi-enclosed casing 10 may further have a plurality of casing connecting holes 17 corresponding to the cover plate connecting holes 22. When the cover plate 20 is placed over the opening side (i.e., the side having the first opening) of the semi-enclosed housing 10, the respective openings 22 of the cover plate 20 and the respective openings 17 of the housing may face each other one by one, and the fixing member 50 may be inserted into the corresponding openings 22 and 17 to connect the cover plate 20 and the semi-enclosed housing 10.
In the present embodiment, as shown in fig. 3, grooves 16 may be formed on the contact surfaces of the semi-closed casing 10 and the cover plate 20, and sealing between the semi-closed casing 10 and the cover plate 20 may be achieved by sealing gaskets placed in the grooves 16.
To sum up, the utility model discloses a shale gas well crack analog system's advantage can include:
(1) compare in the seam internal gas liquid two-phase flow analogue means that present indoor experiments are in use, the utility model discloses a set up the pore on the casing that shale gas well crack analog system included (seam height-seam long face) to connect through high pressure resistant pipeline, switching valve, realized the simulation to real reservoir environment natural crack development degree.
(2) Compare in the crack seam interior gas-liquid two-phase flow analogue means of commonly used, the utility model discloses but the full-automatic lift post of accessible fluid pressure type quick adjustment crack analog system relative height is favorable to realizing the simulation when horizontal well section box difference or different well arrangement cloth seam modes.
(3) The utility model discloses a device structural design and test method scientific and reasonable, experiment convenient operation, the withstand voltage and the leakproofness requirement of experiment test can be satisfied to each component part of device.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A shale gas well fracture simulation system is characterized by comprising a semi-closed shell, a cover plate and a rock plate, wherein,
the semi-closed shell is provided with a cavity, an opening is formed in the outer surface of the shell through the cavity, X groups of pore passages distributed along a first direction are formed in the bottom of the cavity, each group of pore passages comprise an outer pore passage penetrating through the semi-closed shell and a pressure measuring pore passage, an inlet channel and an outlet channel which communicate the outside with the cavity and face each other are further arranged on the semi-closed shell, the axes of the inlet channel and the outlet channel are perpendicular to the opening direction of the cavity, the first direction is the direction from the inlet channel to the outlet channel, and X is an integer larger than 1;
the cover plate covers the opening of the semi-closed shell;
the rock plate is arranged in the cavity, one surface of the rock plate is connected with the bottom surface of the cavity, X inner channels which are distributed along the first direction and can correspond to the outer channels are arranged on the rock plate, the inner channels penetrate through the two surfaces of the rock plate, and the axes of the outer channels and the inner channels which are in corresponding relation in pairs are on the same straight line and jointly form a pipeline connecting channel;
the cavity, the rock plate and the cover plate enclose a laying belt, and an inlet channel and an outlet channel of the semi-closed shell are communicated with the laying belt.
2. The shale gas well fracture simulation system of claim 1 further comprising proppant disposed in the paved zone.
3. The shale gas well fracture simulation system of claim 1, wherein the cover plate and the semi-enclosed housing are connected by a plurality of fasteners.
4. The shale gas well fracture simulation system of claim 1, further comprising a base on which the housing can be placed, and a lifting mechanism for supporting the base, the lifting mechanism comprising at least two lifting columns attached to a bottom surface of the base at different locations.
5. The shale gas well fracture simulation system of claim 1 wherein the rock plate is sealed to the adjacent semi-enclosed casing cavity wall by a seal.
6. The shale gas well fracture simulation system of claim 1 wherein the face of the rock panel facing the opening is an artificially etched matte.
7. The shale gas well fracture simulation system of claim 1 further comprising a heating unit capable of heating the semi-enclosed housing.
8. The shale gas well fracture simulation system of claim 7, wherein the heating unit comprises a heating jacket, the semi-enclosed housing being disposable within the heating jacket.
9. The shale gas well fracture simulation system of claim 1 wherein the outer and inner pore canals have the same pore size.
10. The shale gas well fracture simulation system of claim 1, wherein the cover plate has one or more visualization windows disposed thereon.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921666410.4U CN211115949U (en) | 2019-09-30 | 2019-09-30 | Shale gas well crack simulation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921666410.4U CN211115949U (en) | 2019-09-30 | 2019-09-30 | Shale gas well crack simulation system |
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| CN211115949U true CN211115949U (en) | 2020-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177604A (en) * | 2020-07-31 | 2021-01-05 | 中国石油天然气集团有限公司 | Quantitative evaluation method for determining interference degree between fracturing wells |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177604A (en) * | 2020-07-31 | 2021-01-05 | 中国石油天然气集团有限公司 | Quantitative evaluation method for determining interference degree between fracturing wells |
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