CN215927357U - Carbon dioxide fracturing sand-carrying reinforcing device system - Google Patents
Carbon dioxide fracturing sand-carrying reinforcing device system Download PDFInfo
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- CN215927357U CN215927357U CN202122287008.9U CN202122287008U CN215927357U CN 215927357 U CN215927357 U CN 215927357U CN 202122287008 U CN202122287008 U CN 202122287008U CN 215927357 U CN215927357 U CN 215927357U
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Abstract
The utility model relates to a carbon dioxide fracturing sand-carrying enhancement device system. A carbon dioxide fracturing sand-carrying reinforcing device system comprises a casing and an oil pipe, wherein the casing and the oil pipe are arranged from a wellhead, and the oil pipe is positioned in the casing; the carbon dioxide fracturing enhancement device is connected in series through an oil pipe; the carbon dioxide fracturing reinforcing device is a hollow pipe body, and the inner diameter of the pipe body is matched with the inner diameter of an oil pipe; the upper part of the pipe body is provided with an upper joint, the lower part of the pipe body is provided with a lower joint, and the middle parts of the inner wall and the outer wall of the pipe body are provided with a plurality of alloy tooth groups with fluid disturbance protrusions; the carbon dioxide fracturing sand-carrying reinforcing device system is simple in structure, easy to produce in large scale, low in cost and high in efficiency.
Description
Technical Field
The utility model relates to a carbon dioxide fracturing sand-carrying enhancement device system.
Background
According to the existing research, the carbon dioxide is used for fracturing unconventional oil and gas reservoirs such as shale gas and the like, the method has unique advantages, the problem that a large amount of water resources are used in the traditional hydraulic fracturing is solved, meanwhile, the method can be efficiently developed, the yield of a single well is improved, and CO2 can be buried in the reservoirs. However, the problems that sand carrying performance is weak due to low viscosity of the carbon dioxide in the fracturing process, sand is formed into small clusters and is easy to sand block due to uneven sand adding of a closed sand mixing truck are not effectively solved, and the existing methods increase the viscosity of the carbon dioxide sand carrying liquid by adding a tackifier and the like so as to increase the sand carrying performance, change the properties of the carbon dioxide, pollute a reservoir and the environment by a chemical agent, and effectively solve the problem that the sand in the carbon dioxide sand carrying liquid is uneven in distribution.
Disclosure of Invention
The utility model aims to solve the problems and provides a carbon dioxide fracturing sand-carrying enhancement device system. The carbon dioxide sand-carrying liquid flows disorderly due to self-interference, so that the sand-carrying performance of the carbon dioxide sand-carrying liquid is enhanced on one hand, and solid particle micro-groups in the carbon dioxide sand-carrying liquid are stirred and dispersed on the other hand, and the sand-carrying uniformity is enhanced.
The technical scheme of the utility model is as follows:
a carbon dioxide fracturing sand-carrying reinforcing device system comprises a casing and an oil pipe, wherein the casing and the oil pipe are arranged from a wellhead, and the oil pipe is positioned in the casing; the carbon dioxide fracturing enhancement device is connected in series through an oil pipe; the carbon dioxide fracturing reinforcing device is a hollow pipe body, and the inner diameter of the pipe body is matched with the inner diameter of an oil pipe; the upper part of the pipe body is provided with an upper joint, the lower part of the pipe body is provided with a lower joint, and the middle parts of the inner wall and the outer wall of the pipe body are provided with a plurality of alloy tooth groups with fluid disturbance protrusions;
the alloy teeth of each alloy tooth group are mutually staggered with the alloy teeth of the adjacent alloy tooth group, and the axial included angle between any one alloy tooth group and the pipe body is 30-60 degrees; each alloy tooth group is formed by connecting a plurality of alloy teeth through arc surfaces, the radius of the arc surface between every two adjacent alloy teeth in any one alloy tooth group is the same as that of the alloy teeth, and the arc angle of the arc surface is the same as that of the alloy teeth; the lowest part of the arc surface of the outer wall of the pipe body is tangent with the outer wall of the pipe body, and the lowest part of the arc surface of the inner wall of the pipe body is tangent with the inner wall of the pipe body; the arc angle of the alloy tooth is 90-120 degrees, the radius and the width of the alloy tooth are consistent and are one twentieth to one tenth of the inner diameter of the pipe body.
Any alloy tooth in each alloy tooth group is arranged at the right middle position of two adjacent alloy teeth in two adjacent alloy tooth groups.
The length of the pipe body is 500-2000mm, and the longitudinal length of the alloy tooth group on the pipe body is 200-1600mm and does not exceed the length of the pipe body.
The oil pipe is suspended on a wellhead through a hanger.
And the axial included angle between any one alloy tooth group and the pipe body is 45 degrees.
The internal diameter of the carbon dioxide fracturing reinforcing device is 62mm in internal diameter and 73.02mm in external diameter, the width of the alloy tooth is 6mm, and the radius of the alloy tooth is 6 mm.
The internal diameter of the carbon dioxide fracturing reinforcing device is 76mm, the external diameter is 88.9mm, the width of the alloy tooth is 8mm, and the radius of the alloy tooth is 8 mm.
The utility model has the technical effects that:
1. the carbon dioxide fracturing reinforcing device is simple in structure, easy to produce in quantity, low in cost and high in efficiency;
2. no tackifier is added, so that the performance of the carbon dioxide sand-carrying fluid is enhanced, and the reservoir and the environment are not polluted or damaged;
3. according to the fracturing construction scale, a plurality of carbon dioxide fracturing reinforcing devices can be selected to be connected with an oil pipe in series to form a full-pipeline carbon dioxide fracturing sand-carrying reinforcing device system;
4. the method can be suitable for any well depth, well type and any reservoir, and has wide application range, stability and reliability;
5. the inner diameter and the outer diameter of the sand-carrying reinforcing device are matched with the size of the oil pipe, so that the flowing pressure of the fluid cannot be greatly influenced;
6. the carbon dioxide fracturing reinforcing device changes the flowing direction of the carbon dioxide sand carrying liquid only through the alloy tooth groups of the plurality of fluid disturbance bulges positioned on the inner wall and the outer wall, and simultaneously generates self-disturbance turbulent flow, so that the sand sedimentation in the carbon dioxide sand carrying liquid is reduced, and meanwhile, sand particle micelles in the carbon dioxide sand carrying liquid can be stirred and dispersed, and the sand carrying is more uniform;
7. the carbon dioxide fracturing reinforcing device has long service life and low maintenance and overhaul cost.
Drawings
FIG. 1 is a schematic diagram of a carbon dioxide tubing injection fracturing process.
FIG. 2 is a schematic diagram of a carbon dioxide oil-jacketed fracturing process.
Fig. 3 is a front view of a carbon dioxide fracturing sand-carrying enhancement device (outer wall surface).
Fig. 4 is a half sectional elevation view of a carbon dioxide fracturing sand-carrying enhancement device (inner wall surface).
FIG. 5 is a top view of a middle cross section of a carbon dioxide fracturing sand-carrying enhancement device.
FIG. 6 is a schematic diagram of a single alloy tooth group of the carbon dioxide fracturing sand-carrying reinforcing device.
Fig. 7 is a schematic fluid flow diagram of a carbon dioxide fracturing sand-carrying enhancement device.
1. A wellhead; 2. a hanger; 3. a sleeve; 4. an oil pipe; 5. a carbon dioxide fracturing enhancement device; 7. a packer; r1, radius of alloy tooth; r2, radius of the arc surface; alpha, arc angle of the alloy tooth; beta, the arc angle of the arc surface.
Detailed Description
Example 1
A carbon dioxide fracturing sand-carrying reinforcing device system comprises a casing 3 and an oil pipe 4, wherein the casing 3 is lowered from a wellhead 1, and the oil pipe 4 is positioned in the casing 3; the carbon dioxide fracturing enhancement device 5 is connected in series through an oil pipe 4; the carbon dioxide fracturing reinforcing device 5 is a hollow pipe body, and the inner diameter of the pipe body is matched with that of the oil pipe 4; the upper part of the pipe body is provided with an upper joint, the lower part of the pipe body is provided with a lower joint, and the middle parts of the inner wall and the outer wall of the pipe body are provided with a plurality of alloy tooth groups with fluid disturbance protrusions;
the alloy teeth of each alloy tooth group are mutually staggered with the alloy teeth of the adjacent alloy tooth group, and the axial included angle between any one alloy tooth group and the pipe body is 30-60 degrees; if the axial included angle is too large, the flow resistance of the carbon dioxide sand-carrying liquid is large, the stroke is increased, the friction resistance is increased, the fracturing construction is influenced, and the energy consumption is increased; if the axial included angle is too small, the carbon dioxide sand-carrying liquid generates less self-interference and turbulent flow, and the sand-carrying enhancement function is not obvious.
Each alloy tooth group is formed by connecting a plurality of alloy teeth through arc surfaces, the radius r2 of the arc surface between every two adjacent alloy teeth in any one alloy tooth group is the same as the radius r1 of the alloy teeth, and the arc angle beta of the arc surface is the same as the arc angle alpha of the alloy teeth; the lowest part of the arc surface of the outer wall of the pipe body is tangent with the outer wall of the pipe body, and the lowest part of the arc surface of the inner wall of the pipe body is tangent with the inner wall of the pipe body; the arc angle alpha of the alloy tooth is 90-120 degrees, the radius r1 of the alloy tooth is consistent with the width and is one twentieth to one tenth of the inner diameter of the pipe body. If the arc angle alpha of the alloy tooth is not equal to the arc angle beta of the arc surface, the flowing smoothness of the carbon dioxide sand-carrying liquid is reduced, and the flowing resistance is increased; if the arc angle alpha of the alloy tooth and the arc angle beta of the arc surface are too large, the flow resistance of the carbon dioxide sand-carrying liquid is too large, the friction resistance is increased, the fracturing construction is influenced, and the energy consumption is increased; the arc angle alpha of the alloy tooth and the arc angle beta of the arc surface are too small, so that the carbon dioxide sand-carrying liquid has insufficient self-interference and disordered flow, and the sand-carrying enhancement function is not obvious.
The alloy teeth are made of casting or rolling hard alloy, the hard alloy is one of tungsten-cobalt hard alloy, tungsten-titanium-tantalum (niobium) hard alloy and the like, and the alloy teeth have the characteristics of high hardness, high temperature resistance, corrosion resistance and wear resistance.
When the carbon dioxide sand-carrying liquid flows through the inner wall and the outer wall of the pipe body, the flow direction of the carbon dioxide sand-carrying liquid is changed through the convex alloy tooth group, meanwhile, the carbon dioxide sand-carrying liquid flows in a self-interference and disordered manner, so that the sand-carrying performance of the carbon dioxide sand-carrying liquid is enhanced, solid particle micro-clusters in the carbon dioxide sand-carrying liquid are stirred and dispersed, and the sand-carrying uniformity is enhanced.
Example 2
On the basis of embodiment 1, the method further comprises the following steps: any alloy tooth in each alloy tooth group is arranged at the right middle position of two adjacent alloy teeth in two adjacent alloy tooth groups.
Example 3
On the basis of embodiment 2, the method further comprises the following steps: the length of the pipe body is 500-2000mm, and the longitudinal length of the alloy tooth group on the pipe body is 200-1600mm and does not exceed the length of the pipe body. The oil pipe 4 is suspended from the wellhead 1 through a hanger 2.
Concrete application example 1-oil pipe 4 injection fracturing
As shown in figure 1, the Y11 well is a shale gas horizontal well, which comprises a well head 1, wherein the well head 1 adopts an EE-grade KQ65/70 double-wing valve gas production well head 1, the well depth is 3500m, the horizontal segment length is 800m, and the well head 1 is connected with a gas production well headPerforming carbon dioxide fracturing construction, setting the inner diameter of the sleeve 3 to be 139.7mm by a K344-108 packer 7, and setting the carbon dioxide construction discharge capacity to be 1.6-3.0 m3Min, co-injecting liquid carbon dioxide 300m3The oil pipe 4 is 31/2', and the inner diameter is 76 mm;
the steel grade of the carbon dioxide fracturing reinforcing device 5 is N80, the inner diameter of a pipe body is 76mm, the width of the pipe body is 8mm, the radius of the pipe body is 8mm, and the arc angle alpha of the alloy tooth is 120 degrees; too large and too small width of the alloy tooth and too large and too small radius r1 of the alloy tooth can cause the self-interference to disturb and insufficient flow winding, and the sand-carrying enhancement function is not obvious. The axial included angle between any one alloy tooth group and the pipe body is 45 degrees. The carbon dioxide fracturing enhancement devices 5 are connected in series through the oil pipes 4 every 10 oil pipes 4, and the carbon dioxide fracturing enhancement devices 5 are connected in series in the totality of the whole pipeline, so that a whole pipeline carbon dioxide fracturing enhancement system is formed; the device is suspended on a wellhead 1 through a hanger 2, carbon dioxide sand-carrying liquid is injected from an oil pipe 4 from the wellhead 1, flows through each carbon dioxide fracturing reinforcing device 5 connected with the oil pipe 4 in series, flows through alloy tooth groups on the inner wall of the carbon dioxide fracturing reinforcing device 5, continuously changes the flowing state of the carbon dioxide sand-carrying liquid in the oil pipe 4, generates a lot of small self-interference turbulence flowing, enhances the sand-carrying performance of the carbon dioxide sand-carrying liquid on one hand, also enables solid particle micelles in the carbon dioxide sand-carrying liquid to be stirred and dispersed on the other hand, enhances the sand-carrying uniformity, adopts a low-density propping agent with the particle size of 0.224-0.45 mm in the carbon dioxide fracturing construction, and adds 21m sand cumulatively3Under the condition of not tackifying the carbon dioxide sand carrying liquid, the sand ratio reaches 7 percent, the construction is smooth, and sand blockage is not generated.
Concrete application example 2- -oil pipe 4 and casing 3 are injected into fracturing at the same time
As shown in fig. 2, the Y12 well is a natural gas directional well, and comprises a well head 1, an EE-grade KQ65/70 double-wing valve gas production well head 1 is selected, the well depth is 2600m, carbon dioxide fracturing construction is carried out, the inner diameter of a casing 3 is 121.36mm, an oil pipe 4 and the casing 3 are simultaneously injected and fractured, the oil pipe 4 is 27/8 ", and the inner diameter of the oil pipe is 62 mm; the discharge capacity of the carbon dioxide construction oil pipe 4 is 1.0-2.2 m3Min, the discharge capacity of the sleeve 3 is 1.0-3.0 m3Min, co-injecting carbon dioxide sand carrying fluid 410m3(ii) a The steel grade of the carbon dioxide fracturing reinforcing device 5 is N80, the inner diameter of the pipe body is 62mm, the width of the pipe body is 6mm, the radius of the pipe body is 6mm, and the arc angle alpha of the alloy tooth is 90 degrees. The axial included angle between any one alloy tooth group and the pipe body is 45 degrees. The inner diameter of the pipe body of the carbon dioxide fracturing reinforcing device 5 is 62mm, the steel grade is N80, the pipe bodies are connected in series through oil pipes 4, one carbon dioxide fracturing reinforcing device 5 is connected in series every 8 oil pipes 4, and 30 carbon dioxide fracturing reinforcing devices 5 are cumulatively connected in series in the whole pipeline to form a whole pipeline carbon dioxide fracturing reinforcing system; an oil pipe 4 is suspended on a wellhead 1 through a hanger 2, carbon dioxide sand-carrying liquid is injected from the oil pipe 4 and a sleeve 3 from the wellhead 1, flows through each carbon dioxide fracturing reinforcing device 5 connected with the oil pipe 4 in series, and flows through alloy tooth groups on the inner wall and the outer wall of the carbon dioxide fracturing reinforcing device 5, so that the flowing states of the carbon dioxide sand-carrying liquid in the oil pipe 4 and the carbon dioxide sand-carrying liquid in the sleeve 3 are constantly changed, a lot of small self-interference turbulence flow is generated, on one hand, the sand-carrying performance of the carbon dioxide sand-carrying liquid is enhanced, on the other hand, solid particle micro-groups in the carbon dioxide sand-carrying liquid are also stirred and dispersed, the sand-carrying uniformity is enhanced, a low-density propping agent with the particle size of 0.45-0.224 mm is adopted in the construction of the carbon dioxide fracturing, and 30 m sand is added in an accumulated mode3Under the condition of not tackifying the carbon dioxide sand carrying liquid, the sand ratio reaches 7.3 percent, the construction is smooth, and sand blockage is not generated.
Claims (7)
1. A carbon dioxide fracturing sand-carrying reinforcing device system comprises a casing (3) and an oil pipe (4) which are lowered from a wellhead (1), wherein the oil pipe (4) is positioned in the casing (3); the method is characterized in that: the carbon dioxide fracturing enhancement device (5) is connected in series through an oil pipe (4); the carbon dioxide fracturing reinforcing device (5) is a hollow pipe body, and the inner diameter of the pipe body is matched with the inner diameter of the oil pipe (4); the upper part of the pipe body is provided with an upper joint, the lower part of the pipe body is provided with a lower joint, and the middle parts of the inner wall and the outer wall of the pipe body are provided with a plurality of alloy tooth groups with fluid disturbance protrusions;
the alloy teeth of each alloy tooth group are mutually staggered with the alloy teeth of the adjacent alloy tooth group, and the axial included angle between any one alloy tooth group and the pipe body is 30-60 degrees; each alloy tooth group is formed by connecting a plurality of alloy teeth through arc surfaces, the radius (r2) of the arc surface between two adjacent alloy teeth in any one alloy tooth group is the same as the radius (r1) of the alloy teeth, and the arc angle (beta) of the arc surface is the same as the arc angle (alpha) of the alloy teeth; the lowest part of the arc surface of the outer wall of the pipe body is tangent with the outer wall of the pipe body, and the lowest part of the arc surface of the inner wall of the pipe body is tangent with the inner wall of the pipe body; the arc angle (alpha) of the alloy tooth is 90-120 degrees, the radius (r1) of the alloy tooth is consistent with the width and is one twentieth to one tenth of the inner diameter of the pipe body.
2. The carbon dioxide fracturing sand-carrying enhancement device system of claim 1, wherein: any alloy tooth in each alloy tooth group is arranged at the right middle position of two adjacent alloy teeth in two adjacent alloy tooth groups.
3. The carbon dioxide fracturing sand-carrying enhancement device system of claim 2, wherein: the length of the pipe body is 500-2000mm, and the longitudinal length of the alloy tooth group on the pipe body is 200-1600mm and does not exceed the length of the pipe body.
4. The carbon dioxide fracturing sand-carrying enhancement device system of claim 3, wherein: the oil pipe (4) is suspended on the well head (1) through the hanger (2).
5. The carbon dioxide fracturing sand-carrying enhancement device system of claim 4, wherein: and the axial included angle between any one alloy tooth group and the pipe body is 45 degrees.
6. The carbon dioxide fracturing sand-carrying enhancement device system of claim 5, wherein: the inner diameter of the carbon dioxide fracturing reinforcing device (5) is 62mm, the outer diameter is 73.02mm, the width of the alloy tooth is 6mm, and the radius (r1) of the alloy tooth is 6 mm.
7. The carbon dioxide fracturing sand-carrying enhancement device system of claim 5, wherein: the inner diameter of the carbon dioxide fracturing reinforcing device (5) is 76mm, the outer diameter of the carbon dioxide fracturing reinforcing device is 88.9mm, the width of the alloy tooth is 8mm, and the radius (r1) of the alloy tooth is 8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122287008.9U CN215927357U (en) | 2021-09-22 | 2021-09-22 | Carbon dioxide fracturing sand-carrying reinforcing device system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122287008.9U CN215927357U (en) | 2021-09-22 | 2021-09-22 | Carbon dioxide fracturing sand-carrying reinforcing device system |
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