CN115822509A - Rubber combined sleeve for oil and gas development - Google Patents
Rubber combined sleeve for oil and gas development Download PDFInfo
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- CN115822509A CN115822509A CN202210730608.4A CN202210730608A CN115822509A CN 115822509 A CN115822509 A CN 115822509A CN 202210730608 A CN202210730608 A CN 202210730608A CN 115822509 A CN115822509 A CN 115822509A
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Abstract
The invention relates to a rubber combined sleeve for oil and gas development, which comprises a rubber cylinder and a sleeve, wherein the rubber cylinder is sleeved on the outer side wall of the sleeve, a plurality of rubber cutting grooves are formed in the outer side wall of the rubber cylinder, the rubber cutting grooves extend in the direction parallel to the axial direction of the rubber cylinder, the plurality of rubber cutting grooves are arranged at intervals along the circumferential direction of the rubber cylinder, a rubber rib is formed between every two adjacent rubber cutting grooves, and a rubber hole or a rubber groove is formed in at least one rubber rib along the radial direction of the rubber cylinder. According to the invention, the elastic rubber cylinder is additionally arranged outside the sleeve, the rubber combined sleeve is arranged at the high-risk crack/fault sliding position, and in the fracturing process, if the high-risk crack/fault slides, the rubber can absorb the sliding deformation of the crack/fault, so that the inner sleeve is protected from being influenced. Through set up rubber grooving and rubber hole or rubber groove on the lateral wall at the rubber tube, increased the area of contact of rubber tube with grout, guaranteed the water swelling effect of rubber tube.
Description
Technical Field
The invention relates to the technical field of shale oil and gas development, in particular to a rubber combined casing for oil and gas development.
Background
At present, the deformation of the casing pipe in different degrees occurs in the development process of oil field shale oil, so that the fracturing construction cost and difficulty are increased, the number of fracturing stages is reduced, and serious consequences such as low single well yield, short well life cycle and the like are caused.
Engineering technicians provide some casing deformation technical countermeasures, including optimization design of well track, evaluation of casing failure risk, improvement of steel grade and wall thickness of oil reservoir casing, optimization of well cementation quality, adoption of methods of reducing discharge capacity and reducing liquid volume during fracturing and the like, but all of the measures cannot achieve substantial effects. At present, deformation of an oil layer casing pipe during shale gas and shale oil fracturing is the first technical problem which hinders scale development of shale oil gas and the like.
In the process of implementing the invention, the inventor finds that the main factors of shale gas or shale oil producing reservoir casing damage are the following aspects:
the reservoir stratum theory, the cracks and the fault development of the shale gas or the shale oil can induce the fault layer of the shale gas or the shale oil reservoir to generate dislocation in the hydraulic fracturing construction process, and the shearing displacement generated by the stratum dislocation directly acts on the casing pipe to cause the casing pipe to deform.
Due to the limited size of fractures/faults encountered during production of shale gas or shale oil reservoirs. Through field data analysis, the sliding movement amount of the triggered risk crack/fault is in the range of 15-25 mm, only the shearing deformation of the oil reservoir casing is caused, and the shearing of the oil reservoir casing is not caused.
The conventional technology does not understand the occurrence mechanism of shale gas or shale oil reservoir casing damage and does not consider the characteristic that the sliding movement amount of triggered risk cracks/faults is in the range of 15-25 mm, so the traditional technical thought cannot meet the requirement of preventing the reservoir casing damage when the shale gas or shale oil is fractured.
The shale gas and shale oil reservoir has the characteristics of bedding, cracking and fault development, and in the fracturing process, the fracturing fluid enters the developed fault/crack through channels such as the crack/bedding surface, the crack of the contact surface of the cement sheath and the stratum, and the fracturing fluid is directly communicated with the crack/crack, wherein the fracturing fluid mainly enters the developed fault/crack through the channels such as the crack of the crack/bedding surface and the crack of the contact surface of the cement sheath and the stratum, so that the stratum pressure of the developed fault/crack is increased, the friction coefficient of the developed fault/crack surface is reduced, the sliding of the developed fault/crack is triggered, and the damage of an oil layer casing is caused.
In order to prevent the casing deformation problem during fracturing, chengwei et al propose an idea of ' soft-box-steel ', based on the idea, a method for preventing casing deformation by using ' low elastic modulus ' set cement, namely set cement, under the condition that the compressive strength of the set cement meets the requirement, the elastic modulus is as low as possible is proposed, a ' high-strength microbead well cementation process field test is successively carried out on a Wei 204H38-4 well, a Wei 204H18-5 well and a Wei 204H40-3 well in a Wei block high risk area, and the Wei 204H38-4 well is successfully fractured at present without casing deformation.
As the elastic material is added into the well cementation cement, the elastic modulus of the cement stone is reduced, the compressive strength of the cement stone is reduced, the strength is reduced more and more when the addition amount is increased, and the well cementation quality has the requirement of the lowest strength, so that the addition material is limited, and the reduction of the deformation amount of the casing is limited. The method is suitable for the condition of small deformation amount, and other methods are required to be found for the condition of large deformation amount.
Disclosure of Invention
The invention provides a rubber combined casing for oil and gas development, aiming at preventing the casing from deforming caused by fault sliding and improving the overall benefit of shale oil and gas development.
The technical scheme for solving the technical problems is as follows: the utility model provides a rubber combination sleeve pipe for oil gas development, includes rubber cylinder and sleeve pipe, the rubber cylinder cover is established on the sheathed tube lateral wall, a plurality of rubber grooving have been seted up on the lateral wall of rubber cylinder, the rubber grooving is along extending in the axial direction of being on a parallel with the rubber cylinder and is seted up, and is a plurality of the rubber grooving is followed the circumference interval arrangement of rubber cylinder forms the rubber muscle, at least one between two adjacent rubber grooving follow on the rubber muscle radially seted up rubber hole or rubber groove of rubber cylinder.
The invention has the beneficial effects that: according to the invention, the elastic rubber cylinder is additionally arranged outside the sleeve, the rubber combined sleeve is arranged at the high-risk crack/fault sliding position, and in the fracturing process, if the high-risk crack/fault slides, the rubber can absorb the sliding deformation of the crack/fault, so that the inner sleeve is protected from being influenced. According to the invention, the rubber cutting groove and the rubber hole or the rubber groove are formed on the outer side wall of the rubber cylinder, so that the contact area between the rubber cylinder and cement paste is increased, and the water-absorbing expansion effect of the rubber cylinder is ensured. The rubber cutting groove is formed in an extending mode along the direction parallel to the axial direction of the rubber cylinder, so that the friction shearing effect of a well wall on the rubber cylinder in the casing running process is reduced.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the rubber cutting groove penetrates through two ends of the rubber cylinder and is arranged.
The beneficial effect of adopting the further scheme is that: the rubber cutting grooves are arranged to penetrate through the two ends of the rubber cylinder, so that the deformation space of the rubber cylinder is increased.
Further, the rubber rib includes many first rubber muscle and many second rubber muscle, every all be equipped with on the first rubber muscle rubber hole or rubber groove, many first rubber muscle and many second rubber muscle one-to-one interval cross arrangement.
The beneficial effect of adopting the further scheme is that: set up rubber hole or rubber groove through a rubber muscle at interval, make rubber cylinder overall structure evenly stable, after going into the well bottom down, whole also atress is stable.
Furthermore, the rubber ribs are provided with a plurality of rubber holes or rubber grooves which are arranged in a row along the direction parallel to the axial direction of the rubber cylinder.
The beneficial effect of adopting the further scheme is that: the rubber cylinder has stable structure and uniform stress.
Further, the radial thickness of the rubber cylinder is 15-20mm, the circumferential width of the rubber cutting groove along the rubber cylinder is 0-3 mm, the radial depth of the rubber cutting groove along the rubber cylinder is 5-10 mm, and the circumferential width of the rubber rib is 5-20mm.
Specifically, the radial thickness of the rubber cylinder is specifically 15mm, 16mm, 17mm, 18mm, 19mm and 20mm; the circumferential width of the rubber cutting groove along the rubber cylinder is specifically 0mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm and 3mm; the radial depth of the rubber cutting groove along the rubber cylinder is specifically 5mm, 6mm, 7mm, 8mm, 9mm and 10mm; the circumferential width of the rubber rib is specifically 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm.
The beneficial effect of adopting the further scheme is that: the water absorption expansion effect can be ensured while the stress of the rubber cylinder is ensured.
Furthermore, a rubber hole or a rubber groove is formed in the rubber rib at intervals of a preset interval. The preset distance can be 15-25 mm, and specifically can be 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm.
Further, the rubber hole or the rubber groove is a circular hole or a circular groove, and the diameter of the circular hole or the circular groove is 3-15 mm. The diameter of the circular hole or the circular groove can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm.
Further, the rubber tube is made of expanded rubber, and the expansion rate of the expanded rubber is 1-2, and specifically can be 1, 1.2, 1.5, 1.8 and 2.
The beneficial effect of adopting the above further scheme is: the rubber tube is added outside the casing tube, so that the resistance of casing tube running is increased, and in order to reduce the resistance, special water-swelling rubber is considered for use, namely, the rubber tube only absorbs water to swell in the thickening process of the well cementing slurry.
Furthermore, two ends of the sleeve respectively extend out of two ends of the rubber cylinder, and one end of the sleeve is connected with a sleeve coupling.
Further, the length of the rubber cylinder is 7-9 m. The rubber tube may have a length of 7m, 7.5m, 8m, 8.5m, 9m.
Drawings
FIG. 1 is a schematic structural diagram of a rubber composite casing for oil and gas development according to the present invention in a front view;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 isbase:Sub>A schematic cross-sectional view of A-A of FIG. 1;
FIG. 4 is a schematic axial sectional view of the rubber composite casing for oil and gas development according to the present invention;
FIG. 5 is an enlarged view of the portion B in FIG. 4;
FIG. 6 is a schematic diagram illustrating the effect of the thickness of different rubber cylinders on the deformation of the sleeve according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a rubber cylinder; 11. cutting grooves in rubber; 12. a first rubber rib; 13. a second rubber rib; 14. a rubber groove;
2. a sleeve; 3. a casing collar.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 5, the rubber composite sleeve for oil and gas development of this embodiment includes a rubber cylinder 1 and a sleeve 2, the rubber cylinder 1 is sleeved on the outer side wall of the sleeve 2, a plurality of rubber cutting grooves 11 are formed on the outer side wall of the rubber cylinder 1, the rubber cutting grooves 11 extend in a direction parallel to the axial direction of the rubber cylinder 1, the plurality of rubber cutting grooves 11 are arranged along the circumferential direction of the rubber cylinder 1 at intervals, a rubber rib is formed between two adjacent rubber cutting grooves 11, and a rubber hole or a rubber groove 14 is formed on at least one rubber rib along the radial direction of the rubber cylinder. Through increase elastic rubber tube outside the sleeve pipe, at high risk crack/fault slip department, go into the rubber combination sleeve pipe of this embodiment, in the fracturing process, if high risk crack/fault takes place to slide, rubber can absorb the slip deformation of crack/fault to the protection inlayer sleeve pipe is not influenced. According to the invention, the rubber cutting groove and the rubber hole or the rubber groove are formed on the outer side wall of the rubber cylinder, so that the contact area between the rubber cylinder and cement paste is increased, and the water-absorbing expansion effect of the rubber cylinder is ensured. The rubber cutting groove is formed in an extending mode along the direction parallel to the axial direction of the rubber cylinder, so that the friction shearing effect of the well wall on the rubber cylinder in the casing running process is reduced.
As shown in fig. 1, an alternative of the present embodiment is that the rubber grove 11 is disposed through both ends of the rubber tube 1. The rubber cutting grooves are arranged to penetrate through the two ends of the rubber cylinder, so that the deformation space of the rubber cylinder is increased.
As shown in fig. 1 to fig. 3, a preferable scheme of this embodiment is that the rubber rib includes a plurality of first rubber ribs 12 and a plurality of second rubber ribs 13, each of the first rubber ribs 12 is provided with the rubber hole or the rubber groove 14, and the plurality of first rubber ribs 12 and the plurality of second rubber ribs 13 are arranged alternately one by one. Set up rubber hole or rubber groove through a rubber muscle at interval, make rubber cylinder overall structure even stable, after going into the well bottom down, whole also atress is stable.
As shown in fig. 1 to 5, a preferable scheme of this embodiment is that a plurality of the rubber holes or rubber grooves 14 are provided on the rubber rib, and the plurality of the rubber holes or rubber grooves 14 are arranged in a row along a direction parallel to the axial direction of the rubber tube 1. The rubber cylinder has stable structure and uniform stress.
Further, the radial thickness of the rubber cylinder 1 is 15-20mm, the circumferential width of the rubber cutting groove 11 along the rubber cylinder 1 is 0-3 mm, the radial depth of the rubber cutting groove 11 along the rubber cylinder 1 is 5-10 mm, and the circumferential width of the rubber rib is 5-20mm. The water absorption expansion effect can be ensured while the stress of the rubber cylinder is ensured.
Specifically, the radial thickness of the rubber cylinder 1 is specifically 15mm, 16mm, 17mm, 18mm, 19mm and 20mm; the circumferential width of the rubber cutting groove 11 along the rubber cylinder 1 is specifically 0mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm and 3mm; the radial depth of the rubber cutting groove 11 along the rubber cylinder 1 is specifically 5mm, 6mm, 7mm, 8mm, 9mm and 10mm; the circumferential width of the rubber rib is specifically 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm and 20mm.
Furthermore, a rubber hole or a rubber groove 14 is arranged on the rubber rib at intervals of a preset distance. The preset distance can be 15-25 mm, and specifically can be 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm. The rubber hole or the rubber groove 14 is a circular hole or a circular groove, and the diameter of the circular hole or the circular groove is 3-15 mm. The diameter of the circular hole or the circular groove can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm and 15mm.
In a preferred embodiment of this embodiment, the rubber tube 1 is made of an expanded rubber, and the expansion rate of the expanded rubber is 1 to 2, and specifically may be 1, 1.2, 1.5, 1.8, or 2. The rubber tube is added outside the casing tube, so that the resistance of casing tube running is increased, and in order to reduce the resistance, special water-swelling rubber is considered to be selected, namely, the rubber tube only absorbs water to swell in the thickening process of the well cementation cement paste. Specifically, the thickness of the rubber after expansion can be calculated according to the statistical condition of the deformation of the well casing, and then the thickness of the rubber cylinder before expansion can be obtained according to the expansion rate of the rubber. The thickness of the rubber cylinder after expansion needs to reach 20-25mm calculated by the deformation of the field casing of the Luzhou block, and the expansion rate of the processed rubber is 1.5, so that the thickness of the rubber cylinder of the tool is determined to be 15-20mm.
As shown in fig. 1 and 4, both ends of the casing 2 of the present embodiment respectively extend from both ends of the rubber cylinder 1, and a casing collar 3 is coupled to one end of the casing 2.
Further, the length of the rubber tube 1 is 7-9 m. The rubber tube 1 may have a length of 7m, 7.5m, 8m, 8.5m, 9m.
To evaluate the effect of the present invention, numerical simulations were now performed, as shown in fig. 6. The results are as follows: when the rubber cylinder 1 is not used, the deformation amount of the sleeve 2 is 16.6mm. When the thickness of the water-swelling rubber of the rubber cylinder 1 is 5mm, the deformation of the sleeve 2 is 11.1mm; when the thickness of the water-swelling rubber of the rubber cylinder 1 is 10mm, the deformation of the sleeve 2 is 6.44mm; when the thickness of the water-swelling rubber of the rubber cylinder 1 is 15mm, the deformation of the sleeve 2 is 1.64mm; when the thickness of the water-swellable rubber of the rubber tube 1 is 20mm, the deformation amount of the sleeve 2 is 0.01mm. From the analysis of the above calculation results, it can be known that the deformation of the sleeve is reduced with the increase of the thickness of the rubber due to the water absorption expansion of the rubber cylinder, as shown in fig. 6.
By statistically processing well logging data of Weiyuan, changning and Zhaotong blocks, deformation characteristics of the casing are analyzed, and results show that: the shear type casing pipe has deformation over 70%, deformation length (half wavelength) mainly in the range of 1.5-2.5 m and deformation amount (wave crest) mainly in the range of 5-15 mm. Combining the rule of influence of different rubber thicknesses on the deformation of the casing in numerical simulation, the thickness of the water-swelling rubber in the combined casing on site is recommended to be 10mm, the thickness after two times of water-swelling can reach 20-25mm, and the influence on the deformation of the casing can be minimized when the sliding distance of a fault is 30mm or less. The specific parameters of the combined casing are as follows: the outer diameter of the sleeve is 139.7mm, and the wall thickness of the sleeve is 9.17mm; the thickness of the rubber tube is 10mm, the outer diameter of the rubber tube before water absorption is 159.7mm, and the outer diameter of the rubber tube after water absorption is 189.7mm.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The utility model provides a rubber combination sleeve pipe for oil gas development, its characterized in that, includes packing element and sleeve pipe, the packing element cover is established on the sheathed tube lateral wall, a plurality of rubber grooving have been seted up on the lateral wall of packing element, the rubber grooving is seted up along extending in the axial direction of packing element along being on a parallel with, and is a plurality of the rubber grooving is followed the circumference interval arrangement of packing element forms the rubber muscle between two adjacent rubber grooving, at least one follow on the rubber muscle rubber hole or rubber groove have been seted up in the radial of packing element.
2. The rubber combined sleeve for oil and gas development as claimed in claim 1, wherein the rubber cutting groove is arranged through both ends of the rubber barrel.
3. The rubber combined sleeve for oil and gas development of claim 1, wherein the rubber ribs comprise a plurality of first rubber ribs and a plurality of second rubber ribs, each first rubber rib is provided with the rubber holes or the rubber grooves, and the plurality of first rubber ribs and the plurality of second rubber ribs are arranged in a one-to-one interval cross manner.
4. The rubber combined sleeve for oil and gas development of claim 1, wherein the rubber rib is provided with a plurality of rubber holes or rubber grooves, and the plurality of rubber holes or rubber grooves are arranged in a row along a direction parallel to the axial direction of the rubber cylinder.
5. The rubber composite sleeve for oil and gas development of claim 1, wherein the radial thickness of the rubber cylinder is 15-20mm, the circumferential width of the rubber cutting groove along the rubber cylinder is 0-3 mm, the radial depth of the rubber cutting groove along the rubber cylinder is 5-10 mm, and the circumferential width of the rubber rib is 5-20mm.
6. The rubber composite sleeve for oil and gas development of claim 1, wherein the rubber ribs are provided with rubber holes or rubber grooves at intervals of a preset distance.
7. The rubber combined casing for oil and gas development according to claim 1, wherein the rubber hole or the rubber groove is a circular hole or a circular groove, and the diameter of the circular hole or the circular groove is 3-15 mm.
8. The rubber composite sleeve for oil and gas development as claimed in claim 1, wherein the rubber cylinder is made of expanded rubber, and the expansion rate of the expanded rubber is 1-2.
9. The rubber composite casing for oil and gas development of claim 1, wherein two ends of the casing respectively extend out of two ends of the rubber cylinder, and one end of the casing is connected with a casing collar.
10. The rubber composite casing for oil and gas development of claim 1, wherein the length of the rubber cylinder is 7-9 m.
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| CN202210730608.4A CN115822509A (en) | 2022-06-24 | 2022-06-24 | Rubber combined sleeve for oil and gas development |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210730608.4A CN115822509A (en) | 2022-06-24 | 2022-06-24 | Rubber combined sleeve for oil and gas development |
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| CN115822509A true CN115822509A (en) | 2023-03-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117072130A (en) * | 2023-06-25 | 2023-11-17 | 中国石油天然气集团有限公司 | Construction method for reducing internal fluid pressure of natural fracture and sliding sleeve switch tool |
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