CN112483008B - Special-shaped casing and application thereof in preventing gas well annulus pressure - Google Patents
Special-shaped casing and application thereof in preventing gas well annulus pressure Download PDFInfo
- Publication number
- CN112483008B CN112483008B CN202011337493.XA CN202011337493A CN112483008B CN 112483008 B CN112483008 B CN 112483008B CN 202011337493 A CN202011337493 A CN 202011337493A CN 112483008 B CN112483008 B CN 112483008B
- Authority
- CN
- China
- Prior art keywords
- sleeve
- pressure
- special
- cement
- casing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000004568 cement Substances 0.000 claims abstract description 84
- 238000012856 packing Methods 0.000 claims abstract description 42
- 239000012530 fluid Substances 0.000 claims description 40
- 239000002002 slurry Substances 0.000 claims description 22
- 238000012360 testing method Methods 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000005465 channeling Effects 0.000 abstract description 5
- 238000005553 drilling Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 27
- 239000003921 oil Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to the technical field of drilling and completion of oil and gas wells, and relates to a special-shaped casing and application thereof in preventing annulus pressure of a gas well. The inner surface or/and the outer surface of the sleeve is/are provided with a plurality of bulges, the bulges are vertical to the axis and are distributed in a ring shape along the circumferential direction of the pipe, and different rings are not crossed; the bulges are arranged closely or at intervals and are periodically distributed along the axis; the height of the bulge does not exceed 1/2-3/4 of the height of the annulus. According to the invention, the hydraulic packing capacity of the cementing interface of the casing-cement sheath in unit length is improved through the casing with a special shape, so that the overall hydraulic packing capacity of the cementing interface is improved, gas channeling is prevented and reduced, and the annulus pressure of a gas well is prevented.
Description
The technical field is as follows:
the invention belongs to the technical field of drilling and completion of oil and gas wells, and relates to a special-shaped casing and application thereof in preventing annulus pressure of a gas well.
The background art comprises the following steps:
the gas well annulus under pressure refers to the phenomenon that after the completion of well cementation operation of a gas well and in the subsequent production operation process, formation gas enters an annulus between an oil pipe and a production casing, or an annulus between a production casing and a technical casing, or an annulus between a technical casing and a surface casing, and then flows to the upper formation and the ground, and certain pressure exists in the annuluses. In the process of gas reservoir development at home and abroad, the problem of annulus pressure of gas wells generally exists, for example, the problem of annulus pressure of at least 43% of wells in the gulf of mexico is counted, the problem of annulus pressure of deep gas wells in the ROCKY region of Canada exists in different degrees, and the problem of annulus pressure of a plurality of high-pressure gas wells in Tarim and Sichuan of China also exists; moreover, according to the production rule of natural gas wells at home and abroad, the problem of annulus pressure of the gas well is more and more prominent along with the increase of the natural gas exploitation time.
The problem of annulus pressure of the gas well means that gas has a channeling flow, the gas channeling flow not only affects the yield of the gas well and reduces the recovery ratio, but also has adverse effect on subsequent operation, and serious safety and environmental problems can be caused if the gas contains toxic gases such as hydrogen sulfide and the like. When the annulus pressure problem is not apparent, the annulus pressure and the relief pressure are typically monitored periodically, which can increase the cost of pressure monitoring and wellhead relief. When the annular pressure problem is serious, the well needs to be shut in, and sometimes the whole well or well group is scrapped. From the viewpoint of environmental protection and safety, operators need to frequently close and repair the well to solve the problem of annulus pressure, and the resulting well closing and production stopping loss and operation cost are huge. Therefore, the problem of annular pressure is mainly prevented, and the research of an effective prevention method is of great significance.
At present, scholars at home and abroad have carried out a large amount of researches to the problem of the annulus pressure of the gas well, have analyzed the reason that leads to the annulus pressure to take, include: leakage of an oil casing, low well cementation displacement efficiency, unreasonable cement slurry system, change of underground temperature and pressure after well cementation and the like. For the reasons, methods for preventing the annulus from being pressurized are provided, and comprise the following steps: the displacement efficiency during well cementation is improved through a series of measures, three-pressure stability before well cementation, in the well cementation process and in the waiting setting process is ensured, a cement paste system meeting the sealing requirement is designed, and the performance of the cement paste can bear the change of underground temperature, pressure, stress and the like. The prevention methods have some effects after being applied on site, but the problem of annular pressure still occurs after a plurality of wells use the prevention methods, so further research on the annular pressure prevention method of the gas well needs to be carried out.
The nature of the problem of annulus pressure in a gas well is gas channeling, which is closely related to the hydraulic packing capability of a casing-cement sheath cementing interface. The Feng Yongcun and other researches show that the hydraulic packing capacity of the cementing interface of the common casing and the cement sheath is gradually increased along with the increase of the length of the cementing interface when the length of the cementing interface is shorter, and the hydraulic packing capacity is not increased any more when the length of the cementing interface exceeds a certain size. Therefore, the contribution of increasing the length of the cementing interface of the casing-cement sheath beyond a certain length to the hydraulic packing capacity is limited, and the hydraulic packing capacity of the cementing interface of the casing-cement sheath can be improved only by improving the hydraulic packing capacity of the cementing interface per unit length.
The invention content is as follows:
the invention aims to solve the technical problem that the increase of the length of the cementing interface of the casing-cement sheath after a certain length is exceeded has limited contribution to the hydraulic packing capability, and the hydraulic packing capability of the cementing interface of the casing-cement sheath can be improved only by improving the hydraulic packing capability of the cementing interface of unit length.
In order to solve the problems, the invention provides a special-shaped casing and application thereof in preventing annulus pressure of a gas well.
In order to achieve the purpose, the invention is realized by the following technical scheme that the special-shaped sleeve comprises a sleeve body with a straight axis, wherein a plurality of bulges are arranged on the inner surface or/and the outer surface of the sleeve body, the bulges are vertical to the axis and are distributed in a circular ring shape along the circumferential direction of the sleeve, and different rings are not crossed; the bulges are arranged closely or at intervals and are periodically distributed along the axis; the height of the bulge does not exceed 1/2-3/4 of the height of the annular space.
Furthermore, the longitudinal section of the protrusion is one or more of saw-tooth shape, semi-circle shape and trapezoid shape.
Furthermore, the longitudinal section of the bulge is streamline, so that the displacement efficiency is improved conveniently.
The special-shaped casing and the application thereof in preventing annulus pressure of a gas well. In practical use, the specially shaped casing may be placed at any depth in the wellbore.
Furthermore, the inner convex-concave uneven sleeve which is convexly arranged on the inner surface is used as a surface sleeve and/or a technical sleeve, and the inner convex-concave uneven shape is cemented with the cement sheath. The hydraulic packing capability of the cementing interface of the casing and the cement sheath on the inner side is improved, so that the annulus pressure is prevented.
Furthermore, the convex and concave uneven sleeve with the protrusions arranged on the outer surface is used as a production sleeve and/or a technical sleeve, and the convex and concave uneven shape on the outer side is cemented with the cement sheath. The hydraulic packing capability of the cementing interface of the casing and the outer cement sheath is improved, so that the annulus is prevented from being pressed.
Furthermore, the inner and outer uneven sleeves with the bulges arranged on the inner surface and the outer surface are used as technical sleeves, and the inner and outer uneven shapes are cemented with the cement sheath. The hydraulic packing capability of the cementing interface between the sleeve and the cement sheath on the inner side and the outer side can be improved simultaneously, so that the annular pressure is prevented.
Furthermore, the length of the special-shaped sleeve is 1-10 m, the special-shaped sleeve is placed at intervals of one or more groups, and the total length of each group of sleeves does not exceed 10m.
Further, the number of sets of the special-shaped casing can be calculated by the following formula:
in the formula, P f Is the gas layer pressure, MPa; p c The hydraulic packing capacity of each group of sleeves obtained by experimental measurement is MPa; n is the number of sets of sleeves to be placed.
The device for testing the hydraulic packing capacity of the special-shaped sleeve comprises the special-shaped sleeve and a hydraulic packing device, wherein the special-shaped sleeve is provided with a convex special surface; the center of the sleeve is filled with heat-conducting fluid (oil, water or other heat-conducting fluid), and the heating wire is immersed in the heat-conducting fluid; the heating wire is connected with a temperature control device to control the heating temperature; the outer side of the sleeve with the special shape is directly or indirectly connected with the autoclave body, and the autoclave body is connected with the upper cover and the lower cover through bolts to form a closed space; high-temperature-resistant sealing gaskets are arranged between the upper cover and the lower cover and the cement sheath/slurry for sealing; the lower cover is provided with an inner high-pressure pipeline and an outer high-pressure pipeline, wherein the inner high-pressure pipeline is connected with the heat conduction fluid and used for applying pressure to fluid in the sleeve, and the outer high-pressure pipeline is connected with a lower annular space of a cement interface at the lower part of the sleeve and used for injecting fluid to measure the hydraulic packing capacity of the interface; the inner high-pressure pipeline is connected with the main valve sequentially through an inner pressure gauge and an inner pressure reducing valve, the outer high-pressure pipeline is connected with the main valve sequentially through an outer pressure gauge and an outer pressure reducing valve, the pressure reducing valve reduces the pressure of the high-pressure intermediate container to the required pressure, and the pressure gauge measures the pressure reduced by the pressure reducing valve; the main valve is connected with the pump through a high-pressure intermediate container; the number of the upper high-pressure pipelines is consistent with that of the special-shaped surface, one end of each upper high-pressure pipeline is connected with the upper annular space of the upper sleeve-cement interface respectively and used for outputting fluid breaking through the cementing interface, the other end of each upper high-pressure pipeline is connected with the valve through the pressure reducing device, the pressure reducing device is used for reducing the pressure of the breaking-through fluid, and the valve is used for releasing the breaking-through fluid.
Furthermore, the center of the sleeve with a special shape and an unspecified inner surface is directly filled with heat-conducting fluid; the special surface of the outer surface is connected with the autoclave body through a cement sheath/slurry.
Furthermore, a middle steel pipe is arranged in the center of the special-shaped sleeve with the special-shaped inner surface, and a heat-conducting fluid is filled in the middle steel pipe; and cement sheath/slurry is filled between the middle steel pipe and the inner surface of the special-shaped casing.
Furthermore, the outer surface of the sleeve is in a special shape with a non-shaped surface, and the outer surface of the sleeve is connected with the autoclave body through a high-temperature resistant sealing gasket.
Furthermore, the inner surface and the outer surface of the test device are both specially-shaped sleeves, two outer high-pressure pipelines are arranged at the bottom of the test device, one outer high-pressure pipeline is connected with the lower annular space between the lower part of the inner surface of the sleeve and the cement interface, the other outer high-pressure pipeline is connected with the lower annular space between the lower part of the outer surface of the sleeve and the cement interface, and an outer high-pressure pipeline sub-control valve is arranged between the two outer high-pressure pipelines.
Furthermore, the sleeve is a sleeve with a full-size special shape, the grade of steel is the same as that of the steel used for the field sleeve, and the length of the sleeve is 1-10 m.
Furthermore, the high-pressure autoclave body is made of metal materials, and the pressure resistance is not lower than 80MPa.
Furthermore, the cement sheath/slurry is formed by solidifying a cement slurry system used for field well cementation.
Further, the heating temperature range of the heating wire is room temperature to 250 ℃.
Further, the highest pressurizing pressure of the pump is not lower than 80MPa.
The method for testing the hydraulic packing capacity of the casing with the special shape comprises the following steps:
(1) Determining basic parameters such as special-shaped casing parameters, cement slurry formula, underground environment conditions and the like, wherein the basic parameters comprise: steel grade of the casing with special shape, parameters of the convex-concave uneven structure of the casing, cement paste formula, underground temperature and pressure and the like;
(2) Assembling a lower cover (and a high-pressure pipeline), a sleeve with a special shape, an autoclave body and the like, preparing cement paste according to a formula, pouring the cement paste into an annular space, assembling an upper cover, and connecting the high-pressure pipeline of the upper cover;
(3) Heating the fluid temperature to the underground temperature according to the parameters in the step (1), and then pressurizing the fluid pressure to the underground pressure until the cement paste is solidified and waits for 24-72 hours;
(4) After the cement slurry is solidified, gradually increasing the applied fluid pressure on the lower special-shaped casing-cement sheath interface, and recording the pressure applied on the lower interface when the fluid is blown out from the upper special-shaped casing-cement sheath interface, namely the hydraulic packing capacity of the special-shaped casing.
Compared with the prior art, the invention has the beneficial effects that:
(1) The utility model provides a special shape sleeve pipe, on the basis of former sleeve pipe thickness, be equipped with a plurality of archs that are distributed as the ring shape on inner wall and/or outer wall to the application in preventing that the annular space is pressed is proposed to this special shape sleeve pipe.
(2) The hydraulic packing capacity of the cementing interface of the casing-cement sheath in unit length is improved through the casing with a special shape, so that the overall hydraulic packing capacity of the cementing interface is improved, gas channeling is prevented and reduced, and the annulus of the gas well is prevented from being pressurized.
(3) The test device for detecting the hydraulic packing capacity of the casing can quantitatively evaluate the hydraulic packing capacity of the casing.
Drawings
FIG. 1 is a sectional view of a projection 1;
FIG. 2 is a cross-sectional view of the boss 2;
FIG. 3 is a sectional view of the projection 3;
FIG. 4 is a cross-sectional view of the projection 4;
fig. 5 is a sectional view of the projection 5;
FIG. 6 is a cross-sectional view of the projection 6;
fig. 7 is a sectional view of the projection 7;
FIG. 8 is a cross-sectional view of the projection 8;
wherein (a) in the above fig. 1-8 is a protrusion on the inner surface; (b) are raised on the inner and outer surfaces; and (c) the protrusions are arranged on the outer surface.
FIG. 9 is a hydraulic packing capability testing device for a convex-concave uneven casing;
FIG. 10 is a hydraulic packing capacity testing device for an inner and outer rugged casing;
FIG. 11 is a hydraulic packing capability testing device for an internally convex-concave uneven casing;
fig. 12 is a test data graph of a cannula.
In the figure, an upper cover 1, a bolt 2, a high-temperature resistant sealing gasket 3, a heat-conducting fluid 4, a special-shaped sleeve 5, a sleeve body 51, a bulge 52, a special-shaped surface 6, a cement ring/slurry 7, an autoclave body 8, a heating wire 9, a lower cover 10, a temperature control device 11, an internal pressure meter 12, an internal pressure reducing valve 13, an internal high-pressure pipeline 14, an external pressure reducing valve 15, a main valve 16, a high-pressure intermediate container 17, a pump 18, a pressure reducing device 19, a valve 20, an external high-pressure pipeline 21, an external pressure meter 22, a lower annular space 23, an upper annular space 24, an upper high-pressure pipeline 25, an intermediate steel pipe 26 and an external high-pressure pipeline sub-control valve 27.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1:
a special-shaped sleeve comprises a sleeve body 51 with a straight axis, wherein a plurality of bulges 52 are arranged on the inner surface or/and the outer surface of the sleeve body, are vertical to the axis and are distributed in a circular shape along the circumferential direction of the sleeve, and different rings are not crossed; the bulges are arranged closely or at intervals and are periodically distributed along the axis; the height of the bulge does not exceed 1/2-3/4 of the height of the annulus.
As shown in fig. 1 to 8, the longitudinal section of the protrusion is one or more of saw-tooth shape, semi-circle shape and trapezoid shape. Preferably, the longitudinal section of the bulge is streamline, so that the displacement efficiency is improved conveniently.
The special-shaped casing and the application thereof in preventing annulus pressure of a gas well. In practical use, the specially shaped casing may be placed at any depth in the wellbore.
The inner convex-concave uneven sleeve with the protrusions arranged on the inner surface is used as a surface sleeve and/or a technical sleeve, and the inner convex-concave uneven shape is cemented with the cement sheath. The hydraulic packing capability of the cementing interface of the casing and the cement sheath on the inner side is improved, so that the annulus pressure is prevented.
The length of the special-shaped sleeve is 1-10 m, the special-shaped sleeve is placed at intervals of one or more groups, and the total length of each group of sleeves does not exceed 10m.
The number of sets of the special-shaped casing can be calculated by the following formula:
in the formula, P f Is the gas layer pressure, MPa; p c The hydraulic packing capacity of each group of sleeves obtained by experimental measurement is MPa; n is the number of sets of sleeves placed.
Example 2:
furthermore, the convex uneven sleeve with the protrusions arranged on the outer surface is used as a production sleeve and/or a technical sleeve, and the convex uneven shape on the outer side is cemented with the cement sheath. The hydraulic packing capability of the cementing interface of the casing and the outer cement sheath is improved, so that the annulus is prevented from being pressed.
Example 3:
furthermore, the inner and outer uneven sleeves with the bulges arranged on the inner surface and the outer surface are used as technical sleeves, and the inner and outer uneven shapes are cemented with the cement sheath. The hydraulic packing capability of the cementing interface of the sleeve and the cement rings on the inner side and the outer side can be improved simultaneously, so that the annular pressure is prevented.
Example 4:
the device for testing the hydraulic packing capacity of the special-shaped sleeve comprises a special-shaped sleeve 5, a special-shaped groove and a special-shaped groove, wherein the special-shaped groove is provided with a convex special-shaped surface 6; the center of the sleeve is filled with heat-conducting fluid 4 (oil, water or other heat-conducting fluid), and the heating wire 9 is immersed in the heat-conducting fluid; the heating wire 9 is connected with a temperature control device 11 to control the heating temperature; the outer side of the special-shaped sleeve 5 is directly or indirectly connected with an autoclave body 8, and the autoclave body 8 is connected with an upper cover 1 and a lower cover 10 through bolts 2 to form a closed space; high-temperature-resistant sealing gaskets 3 are arranged between the upper cover 1 and the lower cover 10 and the cement sheath/slurry 7 for sealing; an inner high-pressure pipeline 14 and an outer high-pressure pipeline 21 are arranged on the lower cover 10, wherein the inner high-pressure pipeline 14 is connected with the heat-conducting fluid 4 and used for applying pressure to fluid in the casing, and the outer high-pressure pipeline 21 is connected with a lower annular space 23 of a cement interface at the lower part of the casing and used for injecting fluid to measure the hydraulic isolation capacity of the interface; the inner high-pressure pipeline 14 is connected with the main valve 16 sequentially through an inner pressure gauge 12 and an inner pressure reducing valve 13, the outer high-pressure pipeline 21 is connected with the main valve 16 sequentially through an outer pressure gauge 22 and an outer pressure reducing valve 15, the pressure reducing valve reduces the pressure of the high-pressure intermediate container to the required pressure, and the pressure gauge measures the pressure reduced by the pressure reducing valve; the main valve is connected with a pump 18 through a high-pressure intermediate container 17; the high-pressure lines 25 are in the same number as the shaped faces 6, each high-pressure line 25 being connected at one end to the upper annular space 24 of the upper casing-cement interface for the output of a fluid that breaks through the cementing interface and at one end to a valve 20 for reducing the pressure of the breaking-through fluid by means of a pressure reduction device 19 for releasing the breaking-through fluid. As shown in fig. 9, the upper high pressure line 25 is connected to the upper annular space 24 of the casing-cement interface above the contoured surface 6; as shown in fig. 10, the high pressure lines 25 are in two groups, one group connecting to the upper annular space 24 of the casing-cement interface above (inner) the contoured surface 6, and the other group connecting to the upper annular space 24 of the casing-cement interface above (outer) the contoured surface 6; as shown in fig. 11, the upper high pressure line 25 is connected to the upper annular space 24 of the casing-cement interface above the (outer) contoured surface 6.
As shown in fig. 9, the center of the special-shaped casing with the non-shaped inner surface is directly filled with the heat-conducting fluid 4; the special surface of the outer surface is connected with the autoclave body 8 through a cement sheath/slurry 7.
As shown in fig. 10 and 11, the center of the special-shaped casing with the inner surface being the special-shaped surface 6 is provided with an intermediate steel pipe 26 filled with heat-conducting fluid; the cement sheath/grout 7 is filled between the intermediate steel pipe 26 and the inner surface of the specially shaped casing 5.
As shown in FIG. 11, the outer surface of the special-shaped sleeve is a non-shaped surface, and the outer surface of the special-shaped sleeve is connected with the autoclave body 8 through the high-temperature resistant sealing gasket 3.
As shown in fig. 10, the inner and outer surfaces of the testing device are the special casing 5, two outer high-pressure pipelines 21 are arranged at the bottom of the testing device, one is connected with the lower annular space of the lower part of the inner surface of the casing-cement interface, the other is connected with the lower annular space of the lower part of the outer surface of the casing-cement interface, and an outer high-pressure pipeline sub-control valve 27 is arranged between the two outer high-pressure pipelines 21.
The sleeve is a sleeve with a full-size special shape, the grade of steel is the same as that of steel used for the field sleeve, and the length of the sleeve is 1-10 m.
The high-pressure kettle body 8 is made of metal materials, and the pressure resistance is not lower than 80MPa.
The cement sheath/slurry 7 is formed by solidifying a cement slurry system used for field well cementation.
The heating temperature range of the heating wire 9 is room temperature to 250 ℃.
The highest pressurizing pressure of the pump is not lower than 80MPa.
The method for testing the hydraulic packing capacity of the casing with the special shape comprises the following steps:
(1) Determining basic parameters such as special-shaped casing parameters, cement slurry formula, underground environment conditions and the like, wherein the basic parameters comprise: steel grade of the casing with special shape, structural parameters of convex-concave unevenness of the casing, cement paste formula, underground temperature and pressure and the like; wherein, the grade of the special-shaped casing steel is P110; the length of the sleeve was 1.2m, the size was 7in, the wall thickness was 12.65mm (including asperities), the asperities were the structures shown in fig. 1, 4 and 7 (c), respectively, located outside the sleeve, the height (in the radial direction) of the asperities was 4.6mm, and the width of each asperity was 10mm; the cement paste formula is a high-temperature high-pressure high-density cement paste formula and comprises the following components: 100% Jiahua G-grade cement, 40% silicon powder, 135% weighting agent, 0.08% defoaming agent, 0.9% adhesive, 0.35% multifunctional agent, 0.40% dispersing agent and 1.17% retarder; downhole temperatures and pressures are 180 ℃ and 50MPa. A common sleeve is selected for comparison, the length of the common sleeve is 1.2m, the size of the common sleeve is 7in, and the wall thickness of the common sleeve is 12.65mm.
(2) Assembling a lower cover (and a high-pressure pipeline), a sleeve with a special shape, an autoclave body and the like, preparing cement paste according to a formula, pouring the cement paste into an annular space, assembling an upper cover, and connecting the high-pressure pipeline of the upper cover;
(3) Heating the fluid to the downhole temperature of 180 ℃ according to the parameters in the step (1), and then pressurizing the fluid to the downhole pressure of 50MPa until the cement paste is solidified and waits for 24 hours;
(4) After the cement slurry is solidified, gradually increasing the applied fluid pressure on the lower special-shaped casing-cement sheath interface, and recording the pressure applied on the lower interface when the fluid is blown out from the upper special-shaped casing-cement sheath interface, namely the hydraulic packing capacity of the special-shaped casing. The hydraulic packing capacity of the common casing and the four casings shown in fig. 1 (c), fig. 4 (c) and fig. 5 (c) is shown in fig. 12, and it can be seen that the hydraulic packing capacity of the special casing is significantly improved compared with that of the common casing.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (9)
1. A special-shaped sleeve comprises a sleeve body with a straight line axis, and is characterized in that: the inner surface or/and the outer surface of the pipe body is/are provided with a plurality of bulges which are vertical to the axis and are distributed in a circular shape along the circumferential direction of the pipe, and different rings are not crossed; the bulges are arranged closely or at intervals and are periodically distributed along the axis; the height of the bulge does not exceed 1/2 to 3/4 of the height of the annulus;
the longitudinal section of the bulge is one or combination of more than one of sawtooth shape, semicircle shape and trapezoid shape;
the longitudinal section of the protrusions is combined in a zigzag mode, the protrusions comprise first zigzag protrusions which are arranged on the inner surface and/or the outer surface of the sleeve body at intervals and are large in size, second zigzag protrusions which are small in size are arranged between the adjacent first zigzag protrusions, the first zigzag protrusions form a first packing structure of the sleeve body, and the second zigzag protrusions form a second packing structure of the sleeve body.
2. The special shape bushing as claimed in claim 1, wherein: the longitudinal section of the bulge is streamline.
3. A specially shaped casing according to claim 2 and its use in the prevention of annulus pressure in a gas well.
4. The use as claimed in claim 3, characterized in that: the inner convex-concave uneven sleeve which is convexly arranged on the inner surface is used as a surface sleeve and/or a technical sleeve, and the inner convex-concave uneven shape is cemented with the cement sheath; the convex and concave sleeve with the bulges arranged on the outer surface is used as a production sleeve and/or a technical sleeve, and the convex and concave shape on the outer side is cemented with the cement sheath; the inner and outer uneven sleeves with the bulges arranged on the inner surface and the outer surface are used as technical sleeves, and the inner and outer uneven shapes are cemented with the cement sheath.
5. Use according to claim 3, characterized in that: the length of the special-shaped sleeve is 1-10 m, the special-shaped sleeve is placed at intervals of one or more groups, and the total length of each group of sleeves does not exceed 10m.
6. Use according to claim 3, characterized in that: the number of sets of the special-shaped casing can be calculated by the following formula:
in the formula, P f Is the gas layer pressure, MPa; p is c The hydraulic packing capacity of each group of sleeves obtained by experimental measurement is MPa; n is the number of sets of sleeves to be placed.
7. A device for testing the hydraulic packing capacity of the special-shaped casing pipe in claim 1, wherein: comprises a sleeve with a special shape and a special surface provided with a bulge; the inner part of the sleeve is filled with heat-conducting fluid, and the heating wire is arranged in the sleeve and is immersed in the heat-conducting fluid; the heating wire is connected with the temperature control device; the outer side of the sleeve with the special shape is sequentially connected with a cement sheath/slurry and an autoclave body, and the autoclave body is connected with an upper cover and a lower cover through bolts; high-temperature-resistant sealing gaskets are arranged between the upper cover and the lower cover and the cement sheath/slurry; the lower cover is provided with an inner high-pressure pipeline and an outer high-pressure pipeline, wherein the inner high-pressure pipeline is connected with the heat-conducting fluid, and the outer high-pressure pipeline is connected with a lower annular space of a cement interface at the lower part of the sleeve; the inner high-pressure pipeline is connected with the main valve sequentially through an inner pressure gauge and an inner pressure reducing valve, and the outer high-pressure pipeline is connected with the main valve sequentially through an outer pressure gauge and an outer pressure reducing valve; the main valve is connected with the pump through a high-pressure intermediate container; the number of the upper high-pressure pipelines is consistent with that of the special surface, one end of each upper high-pressure pipeline is respectively connected with the upper annular space of the upper sleeve-cement interface, and the other end of each upper high-pressure pipeline is connected with the valve through a pressure reducing device;
the method for testing the hydraulic packing capacity of the casing with the special shape comprises the following steps:
(1) Determining parameters of a casing with a special shape, a cement slurry formula and underground environmental conditions, wherein the parameters comprise: steel grade of the casing with special shape, structural parameters of convex-concave unevenness of the casing, cement slurry formula, underground temperature and pressure;
(2) Assembling a lower cover, a high-pressure pipeline, a sleeve with a special shape and an autoclave body, preparing cement paste according to a formula, pouring the cement paste into an annular space, assembling an upper cover, and connecting the high-pressure pipeline of the upper cover;
(3) Heating the fluid temperature to the underground temperature according to the parameters in the step (1), and then pressurizing the fluid pressure to the underground pressure until the cement paste is solidified and waits for 24-72 hours;
(4) After the cement slurry is solidified, gradually increasing the applied fluid pressure on the lower special-shaped casing-cement sheath interface, and recording the pressure applied on the lower interface when the fluid is blown out from the upper special-shaped casing-cement sheath interface, namely the hydraulic packing capacity of the special-shaped casing.
8. The test apparatus of claim 7, wherein: the center of the special-shaped sleeve with the non-shaped surface on the inner surface is directly filled with heat-conducting fluid; the special surface of the outer surface is connected with the autoclave body through a cement sheath/slurry; the center of the special-shaped sleeve with the special-shaped inner surface is provided with a middle steel pipe, and the middle steel pipe is filled with heat-conducting fluid; cement sheath/slurry is filled between the middle steel pipe and the inner surface of the sleeve with the special shape; the outer surface of the sleeve is in a special shape with a non-shaped surface, and the outer surface of the sleeve is connected with the autoclave body through a high-temperature resistant sealing gasket.
9. The test apparatus of claim 7 or 8, wherein: the inner surface and the outer surface of the testing device are both specially-shaped sleeves, two outer high-pressure pipelines are arranged at the bottom of the testing device, one outer high-pressure pipeline is connected with a lower annular space between the lower part of the inner surface of the sleeve and a cement interface, the other outer high-pressure pipeline is connected with a lower annular space between the lower part of the outer surface of the sleeve and the cement interface, and an outer high-pressure pipeline sub-control valve is arranged between the two outer high-pressure pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011337493.XA CN112483008B (en) | 2020-11-25 | 2020-11-25 | Special-shaped casing and application thereof in preventing gas well annulus pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011337493.XA CN112483008B (en) | 2020-11-25 | 2020-11-25 | Special-shaped casing and application thereof in preventing gas well annulus pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112483008A CN112483008A (en) | 2021-03-12 |
| CN112483008B true CN112483008B (en) | 2023-01-31 |
Family
ID=74934211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011337493.XA Active CN112483008B (en) | 2020-11-25 | 2020-11-25 | Special-shaped casing and application thereof in preventing gas well annulus pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112483008B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5348093A (en) * | 1992-08-19 | 1994-09-20 | Ctc International | Cementing systems for oil wells |
| CN202946041U (en) * | 2012-12-12 | 2013-05-22 | 衡阳华菱钢管有限公司 | Zigzag air-sealed oil well pipe thread joint structure |
| CN209540221U (en) * | 2019-01-21 | 2019-10-25 | 河北盛伟电力工程有限公司 | A kind of trombone slide ferrule structure |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2577051Y (en) * | 2002-11-07 | 2003-10-01 | 李树奎 | Intermediate rod sealing corrugated sleeve |
| CN103174409B (en) * | 2013-03-28 | 2015-10-21 | 中国石油大学(华东) | A kind of deep water cementing cement sheath packing performance testing device |
| CN104153760B (en) * | 2014-07-22 | 2016-08-24 | 中国石油大学(华东) | Oil/gas Well cement sheath sealing characteristics simulating test device and experimental technique |
| CN104500034B (en) * | 2014-12-29 | 2017-04-12 | 西南石油大学 | Device and method for evaluating influence of pressure change on completeness of cement sheath |
| NO20160763A1 (en) * | 2016-05-06 | 2017-11-07 | Wellguard As | A wellbore system, tool and method |
| CN105909181B (en) * | 2016-05-17 | 2018-04-06 | 太原理工大学 | A kind of heat injection exploitation oil gas well cementation corrugated bushing device |
| CN106522923A (en) * | 2016-11-09 | 2017-03-22 | 中国石油大学(华东) | Oil/gas well cement sheath sealing integrity testing device and method for carrying out evaluation through device |
| CN106499385B (en) * | 2016-12-15 | 2017-09-29 | 中国石油大学(北京) | Device and method for evaluating fracture environment setting of casing integrality |
| CN112145155B (en) * | 2017-02-28 | 2022-04-15 | 中国地质大学（北京） | Experimental method of evaluation device capable of eccentrically testing cementing quality of first interface of well cementation |
| CN107167396A (en) * | 2017-07-05 | 2017-09-15 | 西南石油大学 | Evaluating apparatus and method that working solution temperature shock influences on pit shaft mechanical integrity |
| CN109899000B (en) * | 2017-12-08 | 2020-09-04 | 中国石油化工股份有限公司 | Casing pipe nipple |
| CN108843277A (en) * | 2018-06-19 | 2018-11-20 | 广东石油化工学院 | A kind of exploitation of oil-gas field environment-friendly type oil rig |
| CN109681190B (en) * | 2019-03-07 | 2024-02-20 | 中国海洋石油集团有限公司 | High-temperature high-pressure well cement sheath seal integrity evaluation system |
| CN110500043B (en) * | 2019-08-23 | 2021-06-01 | 中国石油大学(北京) | Well cementation system and casing joint |
| CN111927435B (en) * | 2020-08-26 | 2022-03-25 | 西南石油大学 | High-temperature high-pressure casing cement sheath stratum seal integrity evaluation device and method |
-
2020
- 2020-11-25 CN CN202011337493.XA patent/CN112483008B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5348093A (en) * | 1992-08-19 | 1994-09-20 | Ctc International | Cementing systems for oil wells |
| CN202946041U (en) * | 2012-12-12 | 2013-05-22 | 衡阳华菱钢管有限公司 | Zigzag air-sealed oil well pipe thread joint structure |
| CN209540221U (en) * | 2019-01-21 | 2019-10-25 | 河北盛伟电力工程有限公司 | A kind of trombone slide ferrule structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112483008A (en) | 2021-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109681190B (en) | High-temperature high-pressure well cement sheath seal integrity evaluation system | |
| CN103174409B (en) | A kind of deep water cementing cement sheath packing performance testing device | |
| CN104695927B (en) | Coiled tubing and production tubing combined string fracturing and well completion integrated method | |
| CN204679347U (en) | A kind of drilling fluid pressurization sealing crushing test device | |
| CN102635337B (en) | Rapid gas production method by putting coiled tubing under gas well | |
| CN201460803U (en) | Self-expanding packer when meeting oil and water | |
| CN110593811B (en) | Cement sheath initial stress state monitoring experiment method | |
| CN103470229B (en) | A kind of high flux sand screen sand control assorted column jacket | |
| CN204703876U (en) | Bridge type concentric separate injection pipe column | |
| CN114135249A (en) | Reusable and automatic pressure supplementing gas extraction drilling and sealing system and working method thereof | |
| Zhang et al. | Application of wireline intelligent separate-layer water injection technology in Huabei Oilfield | |
| Chen et al. | Investigation on the Depth of Slip Hanger Teeth Bite into Casing and the Mechanical Properties of Casing under Different Suspension Loads in Ultra-Deep Wells. | |
| CN110578494B (en) | Cement sheath initial stress state monitoring experiment device | |
| CN112483008B (en) | Special-shaped casing and application thereof in preventing gas well annulus pressure | |
| CN111456715A (en) | Oil-gas well cement sheath-brittle stratum interface shear bonding strength testing device and method | |
| CN112443288B (en) | Experimental device for evaluating sealing capacity of two interfaces of well cementation cement sheath | |
| CN202531140U (en) | Double-sealing type hot water drive pipe column for directional well in oil field | |
| CN205297464U (en) | Gas injection well head device | |
| CN204716188U (en) | Handling seat sealed type two group sealing machine packer | |
| CN210798950U (en) | Multi-parameter online monitoring device for deep well casing external annular thin guide pipe | |
| CN113914825B (en) | Oil pipe water-doped steam-injection hollow rod oil extraction integrated pipe column and use method thereof | |
| CN221077712U (en) | Pneumatic pressurized water test device for core drilling of deep hole rope without taking out | |
| CN216381321U (en) | Reusable and automatic pressure supplementing gas extraction drilling and sealing system | |
| CN204877373U (en) | Chemical grouting of stratum shutoff in pit seals and separates device | |
| CN218971153U (en) | Fracturing packer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |