CN114592805A - Casing centralizer, sticking and fixing method, casing and casing running method - Google Patents
Casing centralizer, sticking and fixing method, casing and casing running method Download PDFInfo
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- CN114592805A CN114592805A CN202210283308.6A CN202210283308A CN114592805A CN 114592805 A CN114592805 A CN 114592805A CN 202210283308 A CN202210283308 A CN 202210283308A CN 114592805 A CN114592805 A CN 114592805A
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- casing
- strip
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- centralizing
- sleeve
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Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention relates to the technical field of oil extraction equipment, in particular to a casing centralizer, a sticking and fixing method, a casing and a casing running-in method. The casing centralizer provided by the invention comprises a plurality of centralizing strips adhered outside a casing at intervals, wherein the inner sides of the centralizing strips are abutted with the casing, the outer sides of the centralizing strips are abutted with the inner wall of a well hole, and the thickness of the centralizing strips is the same or different, so that the casing centralizer is suitable for various well conditions and the application range of the casing centralizer is expanded. The inner side of the righting strip is provided with a concave cambered surface matched with the sleeve; the outer side of the righting strip is provided with a convex cambered surface matched with the inner wall of the well hole. Compared with the plane, the arrangement of the concave cambered surface can improve the contact area between the casing centralizer and the casing, so that the connection between the high casing centralizer and the casing is more reliable; the setting of convex cambered surface makes the outside and the well inner wall of righting the strip more adaptation, and the more be convenient for cased transfers, plays better righting effect simultaneously for the sheathed tube rate of centering is higher.
Description
Technical Field
The invention relates to the technical field of oil extraction equipment, in particular to a casing centralizer, a sticking and fixing method, a casing and a casing running method.
Background
Along with the rapid development of oil gas development technology, the utilization of oil gas in social life is well guaranteed. After drilling of the oil and gas well is completed, a casing needs to be put in for well cementation operation. Casing centralizers are used to be installed on the outside of a casing and function to centralize the casing. In the process of cementing of a well cementation of an oil and gas well, a casing centralizer is usually installed on a casing string at intervals, so that the center of the casing and the center of a borehole are kept basically consistent, the replacement efficiency of the annulus cement slurry of the borehole can be improved, a uniform cement sheath between the casing and the borehole is ensured, the channeling of the cement slurry is prevented, and the casing jamming accident caused by the pressure difference of the casing is prevented.
In the process of cementing in the well cementation stage, the casing centralizer faces larger impact, so that in order to ensure an ideal centralizing effect, the casing centralizer must not be displaced or fall off, and the impact resistance of the casing centralizer and the reliability of the connection between the casing centralizer and the casing need to be improved as much as possible. In addition, in actual operation, the inner diameter of the drilled well bore is not always consistent everywhere, and for the well bore with non-uniform inner diameter everywhere, if the thickness or the sticking position of the adopted centralizing strip is selected improperly, the outer wall of the centralizing strip at the borehole wall flaring position may not be abutted against the inner wall of the well bore, or the casing is difficult to run, or even difficult to run.
Disclosure of Invention
In order to overcome the above problems or partially solve the above problems, the present invention provides a casing centralizer and a method for adhering and fixing the casing centralizer, so as to improve the reliability of the connection between the casing centralizer and the casing and achieve a better centralizing effect.
The invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a casing centralizer, including a plurality of centralizing strips adhered to the outside of a casing at intervals, where the inner sides of the centralizing strips are abutted to the casing, the outer sides of the centralizing strips are abutted to the inner wall of a wellbore, the thicknesses of the plurality of centralizing strips are the same or different, and the inner sides of the centralizing strips are provided with concave arc surfaces adapted to the casing; and a convex arc surface matched with the inner wall of the well hole is arranged on the outer side of the righting strip.
Based on the first aspect, in some embodiments of the present invention, the two ends of the centering strip along the length direction of the casing are provided with inclined surfaces, and the inclined surfaces are arranged opposite to the casing.
In a second aspect, an embodiment of the present invention provides a method for adhering and fixing, where the casing centralizer is used to implement the following steps in a wind-sheltering, rain-sheltering, dust-free, and sundry-free environment: s1, grinding the surface of the sleeve to improve the roughness of the surface of the sleeve; s2, planning a pasting area of the righting strip on the surface of the sleeve; s3, uniformly coating the adhesive in the planned pasting area; s4, pasting the centering strip in the pasting area, and repeatedly pressing to enable the inner arc surface of the centering strip to be fully contacted with the surface of the sleeve; and S5, after the pasting is finished, placing the sleeve in a wind-shielding, rain-shielding and dust-free environment, and standing for a period of time until the binder is completely cured.
Based on the second aspect, in some embodiments of the present invention, the step S1 includes: removing the anticorrosive and antirust paint coated on the surface of the sleeve, and then polishing the surface of the sleeve by using an electric grinding wheel, a steel wire brush or coarse sand paper.
Based on the second aspect, in some embodiments of the present invention, the step S2 includes: the number of the centralizing strips, the mounting spacing and the mounting position on the casing surface are determined and the attachment area of the centralizing strips is marked at the mounting position.
Based on the second aspect, in some embodiments of the present invention, the step S3 includes: the adhesive is selected and evenly spread in the pasting area and/or on the inner side wall of the righting strip by a brush.
Based on the second aspect, in some embodiments of the present invention, the step S4 includes: the centering strip is aligned to the pasting area, the centering strip is accurately pasted in the pasting area, then the clamping piece is used for fixing, and repeated pressing is carried out, so that the inner side cambered surface of the centering strip is in full contact with the surface of the sleeve.
Based on the second aspect, in some embodiments of the present invention, before the step S1, the method further includes: adopting a pre-trained matching model; acquiring parameter data of a target borehole as input of a matching model, matching the target borehole with a casing and a centralizing strip meeting requirements by the matching model based on the parameter data of the target borehole, and outputting the parameter data of the casing and the centralizing strip; and manufacturing or selecting the casing and the centralizing strip based on the parameter data of the casing and the centralizing strip.
In a third aspect, an embodiment of the present invention provides a casing, including a casing body and a centering strip, where the centering strip is adhered to an outer wall of the casing body by using the above adhering and fixing method.
In a fourth aspect, an embodiment of the present invention provides a casing running method, which is applicable to the casing described above, and plans a running path of the casing based on the parameter data of the target wellbore and the parameter data of the casing and the centralizing bars.
Compared with the prior art, the invention at least has the following advantages and beneficial effects:
in a first aspect, an embodiment of the present invention provides a casing centralizer, including a plurality of centralizing strips adhered to the outside of a casing at intervals, where the inner sides of the centralizing strips are abutted to the casing, the outer sides of the centralizing strips are abutted to the inner wall of a wellbore, and the thicknesses of the plurality of centralizing strips are the same or different, so as to adapt to various wellbore conditions and expand the application range of the casing centralizer. The inner side of the righting strip is provided with a concave cambered surface matched with the sleeve; the outer side of the righting strip is provided with a convex cambered surface matched with the inner wall of the well hole. Compared with the plane, the arrangement of the concave cambered surface can improve the contact area between the casing centralizer and the casing, so that the connection between the high casing centralizer and the casing is more reliable; the setting of convex cambered surface makes the outside and the well inner wall of righting the strip more adaptation, and the more be convenient for cased transfers, plays better righting effect simultaneously for the sheathed tube rate of centering is higher.
In a second aspect, the invention provides a method for sticking and fixing, which adopts the casing centralizer, and implements the following steps in the environment of wind and rain sheltering, no dust and no sundries: s1, grinding the surface of the sleeve to improve the roughness of the surface of the sleeve; s2, planning the pasting area of the centralizing strip on the surface of the sleeve; s3, uniformly coating the adhesive in the planned pasting area; s4, adhering the righting strip in the adhering area, and repeatedly pressing to make the inner arc surface of the righting strip fully contact with the surface of the sleeve; and S5, after the pasting is finished, placing the sleeve in a wind-shielding, rain-shielding and dust-free environment, and standing for a period of time until the binder is completely cured. According to the method for sticking and fixing the casing centralizer, provided by the embodiment of the invention, the casing centralizer is ensured to be in full contact with the surface of the casing and to be firmly and reliably stuck by polishing the surface of the casing, determining a reasonable sticking position, selecting a proper binder and the like.
In a third aspect, a casing is provided, which includes a casing body and a centering strip, wherein the centering strip is adhered to the outer wall of the casing body by the adhering and fixing method. The casing pipe is highly matched with a target borehole, and the standard reaching rate of the cement sheath is improved.
In a fourth aspect, an embodiment of the present invention provides a casing running method, which is applicable to the casing described above, and plans a running path of the casing based on the parameter data of the target wellbore and the parameter data of the casing and the centralizing bars. Through reasonable path planning, the casing can be smoothly put into a borehole, and the running-in speed of the casing is favorably improved.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort. In the drawings:
FIG. 1 is a top view of an embodiment of a casing centralizer;
FIG. 2 is a side view of an embodiment of a casing centralizer;
FIG. 3 is a side view of an embodiment of a casing centralizer;
FIG. 4 is a schematic diagram of an embodiment of a casing centralizer;
FIG. 5 is a schematic diagram of an embodiment of a casing centralizer;
FIG. 6 is a flow chart of steps of a paste fixing method;
FIG. 7 is an axial view of the finished product;
FIG. 8 is a schematic view of a casing in a well in one embodiment of a casing running method;
FIG. 9 is a schematic view of a casing in a well in one embodiment of a casing running method;
fig. 10 is a schematic view of a casing running state in an embodiment of a casing running method.
Icon: 1-a righting strip; 11-a first arc surface; 12-a second arc surface; 13-a groove; 2-a sleeve; 100-well wall; 101-flaring segment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The embodiment of the invention provides a casing centralizer, which comprises a plurality of centralizing strips adhered outside a casing at intervals, wherein the inner sides of the centralizing strips are abutted with the casing, the outer sides of the centralizing strips are abutted with the inner wall of a well hole, and the inner sides of the centralizing strips are provided with first cambered surfaces matched with the casing; and a second cambered surface (shown in figure 1) matched with the inner wall of the borehole is arranged on the outer side of the centralizing strip.
The casing centralizer provided by the embodiment is made of special high polymer resin materials, is manufactured by high-temperature die casting, and has the advantages of small friction force, wear resistance, small torque and corrosion resistance (CO)2And H2S), impact resistance and the like. The inside wall of righting the strip is the concave cambered surface and highly matches with the sleeve pipe, and the outside wall of righting the strip is the cambered surface equally and is equipped with highly matches with the inner wall of well bore, and the crooked direction of first cambered surface and second cambered surface is the same.
Preferably, the two ends of the centralizing strip (i.e. one end of the centralizing strip which is directly impacted in the cementing stage and the other end which is opposite to the end) along the length direction of the casing are provided with inclined planes (as shown in fig. 2), and an acute angle is formed between the inclined planes and the inner side wall of the centralizing strip, and an obtuse angle is formed between the inner side walls of the centralizing strip, namely the inclined planes are arranged back to the casing. Further, the above-mentioned slope is replaced by a curved surface (as shown in fig. 3), so that the impact on the stabilizer bar can be further reduced.
Further, when pasting the righting strip to the sleeve, in order to avoid the inside influence of hand contact to the righting strip to paste the effect, exemplarily, can set up the recess respectively (as shown in fig. 4) in the left and right sides (the direction that is parallel along sheathed tube length direction) of righting strip to when so making things convenient for the user to take the righting strip, provide the impetus for the finger.
Further, slopes/slopes may be provided on both sides of the top of the centralizer strip (as shown in fig. 5) to help cement to slide down during cementing, thereby reducing the cement residue on the top of the centralizer strip.
Example 2
Some embodiments of the present invention provide a method for fixing a patch, specifically:
firstly, adopting a pre-trained matching model;
regarding the training of the matching model, a large amount of test sample data needs to be collected as training samples in the early stage, and continuous updating and optimization of the training samples in combination with actual data samples are needed to improve the accuracy rate after the training is completed.
Acquiring parameter data of a target borehole as input of a matching model, matching the target borehole with a casing and a centralizing strip meeting requirements by the matching model based on the parameter data of the target borehole, and outputting the parameter data of the casing and the centralizing strip;
specifically, the parameter data of the target borehole includes the length and the inner diameter of the borehole and the inner diameter condition of each section in the borehole. The exemplary inner diameter measuring device can collect the data of the well from top to bottom, then the obtained data can be used for constructing a simulation model, the structural state of the well can be more clearly shown, and then the preset inner diameter and outer diameter of the cement sheath are combined to obtain the parameter data of the casing and the centering strip, specifically the diameter length of the casing and the thickness of the centering strip, and the data are output by the matching model.
And manufacturing or selecting the casing and the centralizing strip based on the parameter data of the casing and the centralizing strip.
Based on the data output by the matching model, the user selects or manufactures the corresponding casing and the righting strip by himself to prepare for subsequent pasting.
After the casing pipe and the centralizing strip which are matched with the target borehole are obtained, the following steps are implemented in the environment with wind and rain sheltering, dust free and sundries free (as shown in figure 6):
s1, grinding the surface of the sleeve to improve the roughness of the surface of the sleeve;
specifically, firstly removing the anticorrosive and antirust paint coated on the surface of the sleeve, then polishing the surface of the sleeve by using devices such as an electric grinding wheel, a steel wire brush or coarse sand paper and the like to improve the roughness of the surface, and detecting that the surface roughness Ra of the sleeve is more than or equal to 80 microns by using a portable surface roughness meter, wherein the sleeve is qualified. And then, cleaning the surface of the sleeve by using a cleaning agent to remove dust and dirt on the surface of the sleeve so as to improve the firmness of subsequent bonding.
S2, planning the pasting area of the centralizing strip on the surface of the sleeve;
specifically, the number of the centering bars, the mounting intervals, and the mounting positions on the surface of the sleeve are determined first, the pasting areas of the centering bars are marked at the mounting positions, and the outlines of the pasting areas can be marked by using a painting brush. Illustratively, 3-4 cement pipes can be pasted on each casing pipe according to the phase position of 90 degrees (as shown in figure 7) or 120 degrees, and the pasted position areas are marked, so that the casing pipes are centered, and the quality of the cement sheath is improved. For example, if the wall of the wellbore is relatively uniform, as shown in FIG. 8, 3-4 bars of the same thickness may be used, with the same spacing between the bars. However, if there is a small section of outward expansion on the wall of the borehole, as shown in fig. 9, that is, the diameter of the outward expansion is larger than the diameters of other parts, then i can consider to avoid installing the centering bars in this section, and the casing (here, the casing with the centering bars attached to the outer wall) should pay attention to the direction of casing running in the well during the process of running in the well, so as to avoid rotating the casing as much as possible.
S3, uniformly coating the adhesive in the planned pasting area;
specifically, a proper adhesive is selected, and the adhesive is uniformly coated in the pasting area and/or on the inner side wall of the righting strip by a brush. Regarding the selection of the adhesive, the requirement may be determined according to the materials of the casing centralizer and the casing, in general, the casing is made of metal steel, in this embodiment, the casing centralizer is made of polymer resin, and the adhesive should be a high-strength adhesive capable of effectively adhering two materials with different properties, namely resin and steel, together, so as to ensure the reliability of the connection between the casing centralizer and the casing.
S4, pasting the centering strip in the pasting area, and repeatedly pressing to make the inner arc surface of the centering strip fully contact with the surface of the sleeve;
specifically, the centering strip is aligned to the pasting area, the centering strip is accurately pasted in the pasting area, then the centering strip is fixed through the clamping piece and repeatedly pressed, and the inner side cambered surface of the centering strip is in full contact with the surface of the sleeve.
And S5, after the pasting is finished, placing the sleeve in a wind-shielding, rain-shielding and dust-free environment, and standing for a period of time until the binder is completely cured.
Specifically, after the pasting is completed, the sleeve is placed in a wind-sheltering, rain-sheltering and dust-free environment for solidification, and the solidification time of the glue is generally 2-3 h. And after the glue is completely cured, maintaining the clamping time of the fastener for 24 hours so as to ensure that a better pasting effect is achieved.
Example 3
The embodiment of the invention provides a casing which comprises a casing body and a centralizing strip, wherein the centralizing strip is adhered to the outer wall of the casing body by adopting the adhering and fixing method in the embodiment 2 so as to obtain the casing which is matched with a target borehole. The specific pasting method and the structure of the centering strip are as described in the above embodiment 2 and embodiment 1, and are not described herein again.
Test examples
The compression strength and the shear strength of the casing in the example 3 are measured to reach 30 MPa; the adhesive surface area is 27600mm2, the shearing force is 98.70KN, and the adhesive force required by the casing downhole operation can be better met by adopting the adhesive fixing method provided in the embodiment 2.
Test results on coefficient of friction
Three groups of friction coefficients of the test sample are lower, and the construction of casing running operation can be well met.
Comparative example
The comparison of the technical specifications of the above-mentioned sleeve of example 3 with those of the sleeve made according to the prior art is shown in the following table:
example 4
The present embodiment provides a casing running method, which is applied to the casing in embodiment 3, and plans a running path of the casing based on the parameter data of the target wellbore and the parameter data of the casing and the centralizing strip.
Specifically, the parameter data of the target borehole comprises the length range and the specific position of the outward expansion section, and the parameter data of the casing and the centralizing strip mainly comprises the specific position of the centralizing strip on the casing. In this embodiment, four centralizing bars are used, the phase difference of each centralizing bar is 90 °, as shown in fig. 8, if the borehole wall is relatively uniform, 3-4 centralizing bars with the same thickness can be used, the same interval can be used between the centralizing bars, and when the casing is run down, the casing can be run down in a straight line manner. As shown in fig. 9, if there is a small section of outward expansion on the wall of the borehole, that is, the length of the outward expansion part is not large, then i can consider avoiding installing the centralizing bars in this section at this time, and each centralizing bar can still adopt the same thickness. If a large section of outward expansion exists in the middle of the well wall of the well bore, in order to ensure a good centralizing effect, so that a formed cement sheath has a better centering degree, if a centralizing strip needs to be adhered to the casing corresponding to the outward expansion section and the thickness of the centralizing strip at the position is larger than that of other centralizing strips, the installation position of the centralizing strips, the distance between the centralizing strips and the thickness of the centralizing strips need to be considered, and a reasonable running path needs to be planned to ensure that the casing can be smoothly run in, as shown in fig. 10, if a section of large outward expansion exists on the left side of the well bore, in order to ensure that the centralizing strip of the casing corresponding to the position can be smoothly close to or abutted against the inner wall of the outward expansion section, we need to ensure that the centralizing strip on the other side opposite to the outward expansion section is in a higher position, because the thicker centralizing strip is conveniently and smoothly run in the well, when the cement sheath just starts to run in, the casing body needs to be deviated from the center, the casing body is rotated by the aid of the thicker righting strip when the thicker righting strip is lowered into the outward-expanding section, the casing body is moved to the middle of the well hole, the thick righting strip can be used for assisting judgment by the aid of the centering degree measuring instrument in the process (the casing body does not need to be rotated if the thicker righting strip faces the outward-expanding section at first), and then the casing body is lowered vertically, so that the righting strip on the other side, opposite to the outward-expanding section, is also abutted to the inner wall of the well hole.
In addition, the method of the embodiment is also applicable to horizontal wells.
In summary, the casing centralizer and the adhering and fixing method thereof provided by the embodiments of the present invention have the following beneficial effects:
1. aiming at complex well conditions such as repeated fracturing of a horizontal well, lateral drilling of an old well and the like, the problems that a conventional casing centralizer cannot be fixed, an annular space is small, friction resistance is large, and a casing is difficult to set are easily solved;
2. the casing centralizer is made of high-performance resin materials, and has the characteristics of corrosion resistance (CO2 and H2S), impact resistance and the like.
3. Set up the inclined plane (as shown in figure 2) at the strip of righting along sheathed tube length direction's head and tail both ends (the one end of righting the straight face impact of strip and the other end relative with it in the cementing stage promptly), and constitute the acute angle between this inclined plane and the inside wall of righting the strip, constitute the obtuse angle between the inside wall of righting the strip, the inclined plane sets up to the sleeve pipe dorsad promptly, so, at the cementing in-process, can avoid the impact of the straight face cement of righting the strip, reduce the atress of righting the strip.
4. According to the method for sticking and fixing the casing centralizer, provided by the embodiment of the invention, the adhesive force of the adhesive on the surface of the casing is improved by grinding the surface of the casing; the reasonable sticking position is determined to ensure that the casing has better centering degree when being used in a well; by selecting a proper adhesive, the casing centralizer is ensured to be fully contacted with the surface of the casing and the adhesion is firm and reliable.
5. The casing provided by the embodiment of the invention can be used for dealing with more complex well conditions, and the application range of the adhesive casing centralizer and the casing is expanded.
6. The casing running method provided by the embodiment of the invention can plan a reasonable running path for the casing pasted with the centralizing strips with different thicknesses so as to help the casing to run smoothly.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A casing centralizer comprises a plurality of centralizing strips adhered outside a casing at intervals, wherein the inner sides of the centralizing strips are abutted with the casing, the outer sides of the centralizing strips are abutted with the inner wall of a well hole, the casing centralizer is characterized in that the thicknesses of the plurality of centralizing strips are the same or different, and the inner sides of the centralizing strips are provided with concave arc surfaces matched with the casing; and a convex arc surface matched with the inner wall of the well hole is arranged on the outer side of the righting strip.
2. The casing centralizer of claim 1, wherein the centralizer is configured with chamfers at ends of the casing along a length of the casing, the chamfers facing away from the casing.
3. A method of affixing, characterized in that the casing centralizer according to any of claims 1-2 is used in a wind and rain sheltering, dust-free, debris-free environment to carry out the following steps:
s1, grinding the surface of the sleeve to improve the roughness of the surface of the sleeve;
s2, planning the pasting area of the righting strip on the surface of the sleeve;
s3, uniformly coating the adhesive in the planned pasting area;
s4, pasting the centering strip in the pasting area, and repeatedly pressing to enable the inner arc surface of the centering strip to be fully contacted with the surface of the sleeve;
and S5, after the pasting is finished, placing the sleeve in a wind-shielding, rain-shielding and dust-free environment, and standing for a period of time until the binder is completely cured.
4. The affixing method according to claim 3, wherein said step S1 includes: removing the anticorrosive and antirust paint coated on the surface of the sleeve, and then polishing the surface of the sleeve by using an electric grinding wheel, a steel wire brush or coarse abrasive paper.
5. The affixing method according to claim 3, wherein said step S2 includes: the number of the centralizing strips, the mounting spacing and the mounting position on the casing surface are determined and the attachment area of the centralizing strips is marked at the mounting position.
6. The affixing method according to claim 3, wherein said step S3 includes: the adhesive is selected and evenly spread in the pasting area and/or on the inner side wall of the righting strip by a brush.
7. The affixing method according to claim 3, wherein said step S4 includes: the centering strip is aligned to the pasting area, the centering strip is accurately pasted in the pasting area, then the clamping piece is used for fixing, and repeated pressing is carried out, so that the inner side cambered surface of the centering strip is in full contact with the surface of the sleeve.
8. The affixing method according to claim 3, further comprising, before said step S1:
adopting a pre-trained matching model;
acquiring parameter data of a target borehole as input of a matching model, matching the casing and the centering strip meeting requirements for the target borehole by the matching model based on the parameter data of the target borehole, and outputting the parameter data of the casing and the centering strip;
and manufacturing or selecting the casing and the centering strip based on the parameter data of the casing and the centering strip.
9. A casing comprising a casing body and a stabilizing strip adhered to an outer wall of the casing body by the adhering and fixing method according to claim 8.
10. A casing running method adapted to the casing of claim 9, wherein a running path of the casing is planned based on the parameter data of the target wellbore, the parameter data of the casing and the parameter data of the centralizer.
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| CN202210283308.6A CN114592805A (en) | 2022-03-22 | 2022-03-22 | Casing centralizer, sticking and fixing method, casing and casing running method |
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| CN202210283308.6A CN114592805A (en) | 2022-03-22 | 2022-03-22 | Casing centralizer, sticking and fixing method, casing and casing running method |
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