CN116575872A - Casing centralizer and production method thereof - Google Patents
Casing centralizer and production method thereof Download PDFInfo
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- CN116575872A CN116575872A CN202310843760.8A CN202310843760A CN116575872A CN 116575872 A CN116575872 A CN 116575872A CN 202310843760 A CN202310843760 A CN 202310843760A CN 116575872 A CN116575872 A CN 116575872A
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- sleeve
- semicircular ring
- sleeve body
- groove
- inner connecting
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- 230000007704 transition Effects 0.000 claims abstract description 22
- 230000000712 assembly Effects 0.000 claims abstract description 9
- 238000000429 assembly Methods 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 239000000853 adhesive Substances 0.000 claims description 17
- 230000001070 adhesive effect Effects 0.000 claims description 17
- 238000001746 injection moulding Methods 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 238000007789 sealing Methods 0.000 description 5
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- 239000000463 material Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
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- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2725—Manifolds
Abstract
The application discloses a casing centralizer and a production method thereof, in particular to the technical field of downhole tools in oil fields, and the casing centralizer comprises a casing body and centralizing assemblies distributed along the length direction of the casing body, wherein the centralizing assemblies comprise plastic parts and sleeves, the sleeves are sleeved on the casing body, annular spaces are arranged between the sleeves and the casing body, a plurality of hole groups are arranged on the sleeves, the plastic parts comprise outer positioning blocks, inner connecting parts positioned in the annular spaces and transition structures positioned in the hole groups of each group, the outer positioning blocks are fixedly connected with the inner connecting parts through the transition structures, and the inner connecting parts are fixedly connected with the casing body; the sleeve is provided with an axial limiting structure with the sleeve body, the inner connecting part is fixedly connected with the sleeve body in an initial state, and the centralizing assembly can rotate along the circumferential direction of the sleeve body after the connection between the inner connecting part and the sleeve body is disconnected. The beneficial effects are that: solves the technical problem that the traditional centralizer is difficult to drop due to overlarge dragging pressure.
Description
Technical Field
The application relates to the technical field of downhole tools in oil fields, in particular to a casing centralizer and a production method thereof.
Background
In the oil extraction and drilling process, after the open hole drilling construction is finished, a sleeve is inserted into the open hole well, and then concrete is poured between the annular outer wall of the sleeve and the blank wall of the open hole well, so that a reliable oil extraction channel can be constructed.
The centralizer is a positioning device arranged outside the casing pipe, and has the function of ensuring good concentricity between the casing pipe after being lowered and the open hole well so as to ensure the uniformity of concrete filling. In the prior art, the centralizer mainly has two structural forms, please refer to the following two prior art documents:
structural form one, for example: CN115427658A discloses a centralizer with variable rigidity, the whole centralizer is shaped as a steel cage, and the circumference is provided with an arc-shaped protruding part, when in use, the centralizer is directly sleeved on the circumference of a sleeve, and after the centralizer is lowered into the well, concentric positioning is realized by means of the arc-shaped protruding part.
Structural form two, for example: CN114592805a discloses a casing centralizer, a pasting and fixing method, a casing and a casing running method, and the centralizer described in the document is in a bar-shaped block structure, and is directly and uniformly pasted outside the casing when in use.
After the centralizer is installed downhole, a certain radial abutment force with the borehole wall should be required to ensure casing concentricity and good impact resistance. Because of the radial abutment force, drag pressure, i.e. excessive friction force, often occurs when the casing is lowered, thereby causing difficult or failed running of the casing. The above two types of centralizers commonly used in the prior art have the technical problem.
Disclosure of Invention
In view of the above, the application provides a casing centralizer, which aims to solve the technical problem of difficult lowering caused by overlarge dragging pressure.
In order to achieve the above purpose, the technical scheme of the application is as follows:
the utility model provides a sleeve pipe centralizer, includes the sleeve pipe body and follows sleeve pipe body length direction array distributes's righting subassembly, its key lies in: the centralizing assembly comprises a plastic part and a sleeve, wherein the sleeve is sleeved on a sleeve body, an annular space is formed between the sleeve and the sleeve body, a plurality of hole groups are formed in the sleeve, the plastic part comprises an outer positioning block, an inner connecting part positioned in the annular space and transition structures positioned in the hole groups, the outer positioning block is fixedly connected with the inner connecting part through the transition structures, and the inner connecting part is fixedly connected with the sleeve body;
the sleeve is provided with an axial limiting structure with the sleeve body, the inner connecting part is fixedly connected with the sleeve body in an initial state, and the centralizing assembly can rotate along the circumferential direction of the sleeve body after the connection between the inner connecting part and the sleeve body is disconnected; the outer positioning blocks on the centralizing assemblies are sequentially arranged in the circumferential direction of the sleeve body.
Preferably, the centralizing assembly further comprises fixing rings corresponding to the upper end and the lower end of the sleeve, the upper end and the lower end of the sleeve are sleeved on the corresponding fixing rings in a rotatable mode, the fixing rings are fixedly arranged on the sleeve body, the inner connecting portion is of an arc-shaped sheet structure and is adhered to the sleeve body, the transition structure is a screw, and the outer positioning block is fixedly connected with the inner connecting portion through at least two transition structures.
Preferably, the fixing ring is fixed on the sleeve body in an adhesive, welding or riveting mode.
Preferably, the outer positioning block, the inner connecting portion and the transition structure are integrally injection molded, the plastic part has elasticity, the inner connecting portion is of a cylindrical structure, when the outer positioning block receives friction resistance, the sleeve body is screwed, and the inner side surface of the inner connecting portion can slide relative to the annular groove.
Preferably, the sleeve comprises a first semicircular ring and a second semicircular ring which are arranged just right, wherein the inner sides of the upper end and the lower end of the first semicircular ring are respectively provided with a first arc-shaped positioning protrusion formed along the outline direction of the first semicircular ring, the inner sides of the upper end and the lower end of the second semicircular ring are respectively provided with a second arc-shaped positioning protrusion formed along the outline direction of the second semicircular ring, the ends of the first arc-shaped positioning protrusions and the second arc-shaped positioning protrusions are respectively provided with a connecting hole, and the first semicircular ring and the second semicircular ring are locked into a whole through threaded fasteners penetrating through the connecting holes.
Preferably, a sliding gap is arranged between the first arc-shaped positioning protrusion and the second arc-shaped positioning protrusion and the groove wall of the annular groove.
Preferably, the number of the hole groups is three, one group is arranged at the middle position of the first semicircular ring, the other two groups are symmetrically arranged on the second semicircular ring, the connecting holes are arranged along the tangential direction of the sleeve, and key grooves are formed in the positions, close to the ends of the outer positioning blocks, of the sleeve body.
Preferably, each group of holes comprises an upper round hole positioned at the upper part of the sleeve, a lower round hole positioned at the lower part of the sleeve, and strip-shaped holes distributed between the upper round hole and the lower round hole.
Preferably, the strip-shaped holes are distributed in two rows alternately.
Preferably, the outer positioning block is constructed in a long bar structure, and guide inclined planes are arranged at the outer sides of the upper end and the lower end of the outer positioning block.
In order to install the plastic component in the casing centralizer, the application also provides a production method of the casing centralizer, which is characterized by comprising the following steps:
s1: preparing the sleeve body, the first semicircular ring and the second semicircular ring, wherein the number of the first semicircular ring and the second semicircular ring is consistent with the number of annular grooves on the sleeve body;
s2: the first semicircular ring and the second semicircular ring are fixedly sleeved on the circumference of the annular groove of the sleeve body by using a threaded fastener;
s3: preparing an injection mold; the injection mold comprises an upper mold and a lower mold, wherein the upper end of the lower mold is provided with a lower positioning groove and lower avoidance grooves positioned at two ends of the lower positioning groove, the lower positioning groove is matched with the first semicircular ring, the lower end of the upper mold is provided with an upper positioning groove and upper avoidance grooves positioned at two ends of the upper positioning groove, and the upper positioning groove is matched with the second semicircular ring; an injection molding runner communicated with an upper positioning groove is arranged in the upper die, a downward concave forming groove is formed in the lower surface of the lower positioning groove, and the forming groove is matched with the outer positioning block; the lower surface of the lower positioning groove is provided with a positioning convex column which is matched with the connecting hole;
s4: placing the first semicircular ring in a lower positioning groove of a lower die, sleeving a corresponding connecting hole on a positioning convex column, and then closing the upper die downwards, so that the upper positioning groove covers the second semicircular ring; at this time, the two ends of the sleeve body are positioned in the upper avoidance groove and the lower avoidance groove;
s5: pouring molten plastic into the injection molding runner until the annular space, the hole group and the molding groove are filled with the molten plastic;
s6: after cooling and preserving heat for a certain time, the upper die is opened upwards, and the sleeve body, the first semicircular ring, the second semicircular ring and the plastic part which are solidified into a whole are taken out.
Preferably, a rectangular key block which is matched with the key groove is arranged at the bottom of the lower avoidance groove.
Preferably, the injection molding runner comprises a main runner and a first sub-runner communicated with the main runner, two ends of the first sub-runner are respectively communicated with a second sub-runner and a third sub-runner, pouring ports are formed in two end parts of the second sub-runner and the third sub-runner, the pouring ports at two ends of the second sub-runner correspond to two upper round holes of the second semicircular ring, and the pouring ports at two ends of the third sub-runner correspond to two lower round holes of the second semicircular ring.
Compared with the prior art, the application has the beneficial effects that:
1. by adopting the casing centralizer provided by the application, for a single-group centralizing assembly, only one external positioning block is rubbed with the hole wall, so that the friction resistance is greatly reduced, and the casing lowering difficulty is reduced.
2. The inner connecting part is connected to the surface of the sleeve body by adopting an adhesive process, when the dragging pressure is too large and the friction resistance causes incapability of further pipe descending, the sleeve can be actively and repeatedly screwed, the adhesive force of the surface of the inner connecting part is broken through, the inner side surface of the inner connecting part slides relative to the annular groove, and the plastic part integrally moves relative to the sleeve body. The plastic part moves in the state, and the position relation between the outer positioning block and the well wall of the open hole well can be changed, so that the original stress state is broken, the possibility that the outer positioning block passes downwards can be effectively improved through continuous attempts, and the technical problem that the centralizer is difficult to drop or fails due to overlarge dragging pressure is solved.
3. The inner connecting part can also be fixed on the surface of the sleeve body in an elastic plastic expanding mode, when the dragging pressure is overlarge, the sleeve is actively and repeatedly screwed, and the inner side surface of the inner connecting part can also slide relative to the annular groove, namely, the plastic part and the sleeve body can relatively move. Likewise, the plastic part moves in the state, so that the position relation between the outer positioning block and the open hole well wall can be changed, the original stress state is broken, the possibility that the outer positioning block passes downwards can be effectively improved by continuously twisting the sleeve, and the technical problem that the centralizer is difficult to drop or fails due to overlarge dragging pressure is solved.
4. The sleeve adopts split type structural design and the arrangement mode of corresponding holes on the first semicircular ring and the second semicircular ring, can ensure the injection molding of plastic parts in the mold, can greatly simplify the development and design difficulty of the injection mold, and has the advantages of ingenious structural design, strong adaptability, low application cost, high feasibility and the like.
5. By adopting the production method of the casing centralizer, provided by the application, and combining with the structural design characteristics of the centralizer, the plastic part can be molded on the casing centralizer in a relatively simple and efficient injection molding mode, and the production method has good injection molding quality.
Drawings
FIG. 1 is a schematic view of the structure of a casing centralizer of the application (plastic part 3 is integrated on casing body 1 by injection molding);
FIG. 2 is an enlarged schematic view of a portion of the casing centralizer of FIG. 1;
FIG. 3 is a partially exploded view of the casing centralizer of FIG. 1;
FIG. 4 is a partial cross-sectional view of the casing centralizer of FIG. 1;
fig. 5 is a schematic illustration of the injection molding of a plastic part 3 in an injection mold B;
FIG. 6 is a cross-sectional view of the injection mold B of FIG. 5;
fig. 7 is a schematic structural view of the upper die 4;
fig. 8 is a schematic structural view of the lower die 5;
FIG. 9 is a cross-sectional view taken along line C-C of FIG. 6;
FIG. 10 is a sectional view taken along D-D in FIG. 6;
FIG. 11 is a sleeve centralizer of a second construction of the application;
FIG. 12 is a partially exploded view of the casing centralizer of FIG. 11;
FIG. 13 is a cross-sectional view of the casing centralizer of FIG. 11;
in the figure: A. a righting assembly; b. An injection mold; 1. A sleeve body; 1a, an annular groove; 1b, key slot; 2. a sleeve; 2a, a first semicircle ring; 2b, a second semicircular ring; 2a1, a first arc-shaped positioning protrusion; 2b1, a second arc-shaped positioning protrusion; 3. a plastic part; 3a, an outer positioning block; 3a1, a guiding slope; 3b, an inner connecting part; 3c, a transitional structure; 4. an upper die; 4a, an upper positioning groove; 4b, upper avoiding grooves; 4c, injection molding flow channels; g. a main runner; h. a first sub-flow path; i. A second shunt; j. a third sub-flow path; m, pouring the mouth; f. rectangular key blocks; 5. a lower die; 5a, a lower positioning groove; 5b, a lower avoidance groove; 5c, a forming groove; 7. a sealing gasket; 9. a support table; 9a, carrier rollers; 10. a fixing ring; a. a connection hole; b. A threaded fastener; c. a sliding gap; d. a convex column; e. An annular space; k. a set of holes; k1, upper round holes; k2, a lower round hole; k3, bar-shaped holes.
Detailed Description
The application is further described below with reference to examples and figures.
First embodiment as shown in fig. 1, a casing centralizer is structured to include a casing body 1 and a number of centralizer assemblies a. As can be seen by referring to fig. 3 and 4, the sleeve body 1 is provided with an annular groove 1a, the centralizing assembly a comprises a plastic component 3 and a sleeve 2, the sleeve 2 is formed by encircling a first semicircular ring 2a and a second semicircular ring 2b which are arranged right opposite to each other, the annular groove 1a is sleeved with the sleeve 2, an annular space e is formed between the sleeve 2 and the annular groove 1a, and a plurality of groups of holes k distributed in a circumferential array are formed in the sleeve 2. Referring to fig. 3 and 4 again, the plastic part 3 is composed of an integrally formed outer positioning block 3a, an inner connecting portion 3b and a transition structure 3c, in this embodiment, the inner connecting portion 3b is a cylindrical structure, which is located in an annular space e between the sleeve 2 and the annular groove 1a, the number of the transition structures 3c is consistent with that of the hole groups k, and is embedded in each hole group k in a one-to-one correspondence manner, and the number of the outer positioning blocks 3a is one, which is formed at the outer end of one of the transition structures 3 c.
As shown in fig. 1, the centering assemblies a are arrayed along the length direction of the casing body 1, and the outer positioning blocks 3a on the centering assemblies a are sequentially arranged in the circumferential direction of the casing body 1, that is, in the length direction of the casing body 1, a phase angle exists between two adjacent outer positioning blocks 3 a. In this embodiment, the outer positioning blocks 3a on each centralizing assembly a are sequentially arranged at intervals of 120 ° in the circumferential direction of the casing body 1, that is, the phase angle between two adjacent outer positioning blocks 3a is 120 °. When the casing body 1 is lowered into the open hole well, the three groups of centralizing assemblies A can be concentrically positioned, and only one outer positioning block 3a of the centralizing assemblies A has hole wall friction, so that friction resistance is greatly reduced, and the casing lowering difficulty is reduced.
The plastic part 3 has elasticity as a whole, and in an initial state, the inner connecting part 3b and the transition structure 3c can be quite stably kept in the sleeve 2, and the outer positioning block 3a can well position and support the wall of the open hole well and has radial abutting force meeting the requirement. On the other hand, when the drag pressure is too large and the pipe cannot be further pulled down due to the friction resistance, since the inner connecting portion 3b is made of plastic and has elasticity, the sleeve body 1 can be actively and repeatedly screwed, so that the inner side surface of the inner connecting portion 3b slides relative to the annular groove 1a, that is, the plastic part 3 and the sleeve body 1 are relatively moved. The plastic part 3 moves in the state, so that the position relation between the outer positioning block 3a and the open hole well wall can be changed, the original stress state is broken, the possibility that the outer positioning block 3a passes downwards can be effectively improved through continuous try, and the technical problem that the centralizer is difficult to drop or fails due to overlarge dragging pressure is solved.
As shown in fig. 2, the outer positioning block 3a is configured in a long bar-shaped structure, and the outer sides of the upper and lower ends thereof are provided with guide inclined surfaces 3a1, so that the trafficability of the outer positioning block 3a can be further improved.
For convenient assembly, sleeve 2 comprises first semicircle ring 2a and second semicircle ring 2b, can see from figure 3 that the inboard at both ends about first semicircle ring 2a all is equipped with along its fashioned first arc location arch 2a1 of profile direction, and the inboard at both ends about second semicircle ring 2b all is equipped with along its fashioned second arc location arch 2b1 of profile direction, and the tip of first arc location arch 2a1 and second arc location arch 2b1 all is equipped with connecting hole a, through twisting screw fastener b to connecting hole a in can with first semicircle ring 2a and second semicircle ring 2b lock complete set section of thick bamboo 2. As can be seen from fig. 4, after the first semicircular ring 2a and the second semicircular ring 2b are installed, a sliding gap c is formed between the first arc-shaped positioning protrusion 2a1 and the second arc-shaped positioning protrusion 2b1 and the groove wall of the annular groove 1a, and when the sleeve body 1 is screwed, the gap can ensure the integral movement formed by the sleeve 2 and the plastic part 3, so that rigid interference is avoided.
Referring to fig. 3, in this embodiment, the number of the hole groups k is three, the three hole groups k are uniformly distributed, the included angle between two adjacent groups is 120 °, one group is disposed at the middle position of the first semicircle 2a, and the other two groups are symmetrically disposed on the second semicircle 2 b. When the plastic sleeve is applied, the transition structures 3c are embedded in the three groups of holes k, and although only one group of transition structures 3c are integrally connected with the outer positioning block 3a, the other two groups of transition structures 3c are reversely embedded in the sleeve 2, so that the connection strength of the plastic part 3 on the sleeve body 1 can be integrally improved.
In this embodiment, each hole group k includes an upper circular hole k1 located at an upper portion of the sleeve 2, a lower circular hole k2 located at a lower portion of the sleeve 2, and strip-shaped holes k3 distributed between the upper circular hole k1 and the lower circular hole k2, and the strip-shaped holes k3 are alternately distributed in two rows. The connecting hole a is arranged along the tangential direction of the sleeve 2, and the sleeve body 1 is provided with key grooves 1b at positions close to the end parts of the outer positioning blocks 3 a.
Due to the special way in which the plastic part 3 is mounted, the plastic part 3 can only be molded onto the sleeve 2 and the sleeve body 1 by means of injection molding. By arranging a group of holes k on the first semicircular ring 2a and two groups of holes k on the second semicircular ring 2b, the plastic part 3 can be conveniently injection molded in the mold, and the second embodiment is referred to as an embodiment II. In addition, the specific arrangement mode of the hole group k, the arrangement direction of the connecting holes a and the arrangement of the key grooves 1b can be helpful to ensure the quality and the precision of the injection molding of the plastic part 3. Please refer to the second embodiment.
In a second embodiment, based on the casing centralizer of the first embodiment, the present application proposes a production method for manufacturing the casing centralizer of the first embodiment, and the technical difficulty of the method is how to injection mold the plastic component 3 in the casing centralizer. The method specifically comprises the following steps:
s1: the sleeve body 1, the first semicircular ring 2a and the second semicircular ring 2b are prepared, and the number of the first semicircular ring 2a and the second semicircular ring 2b is consistent with the number of the annular grooves 1a on the sleeve body 1. The sleeve body 1, the first semicircular ring 2a and the second semicircular ring 2b are all metal parts, and are preferably finished by adopting a machining means.
S2: the first semicircular ring 2a and the second semicircular ring 2b are fixedly sleeved on the circumference of the annular groove 1a of the sleeve body 1 by using the threaded fastener b.
S3: preparing an injection mold B; the injection mold B includes an upper mold 4 and a lower mold 5. As can be seen from fig. 8, the upper end of the lower die 5 is provided with a lower positioning groove 5a and lower avoidance grooves 5b positioned at two ends of the lower positioning groove 5a, the lower positioning groove 5a is matched with the first semicircular ring 2a, the lower surface of the lower positioning groove 5a is provided with a forming groove 5c which is concave downwards, the forming groove 5c is matched with the outer positioning block 3a, and the lower surface of the lower positioning groove 5a is provided with a positioning convex column d which is matched with the connecting hole a. As can be seen from fig. 7, an upper positioning groove 4a and an upper avoiding groove 4b positioned at two ends of the upper positioning groove 4a are arranged at the lower end of the upper die 4, the upper positioning groove 4a is matched with the second semicircular ring 2b, and an injection molding runner 4c communicated with the upper positioning groove 4a is arranged inside the upper die 4.
S4: as shown in fig. 5 to 8, the first semicircular ring 2a is placed in the lower positioning groove 5a of the lower mold 5, and the corresponding connecting hole a is fitted over the positioning boss d, and at this time, the annular space e, the hole groups k on the first semicircular ring 2a and the second semicircular ring 2b, and the molding groove 5c are communicated with each other, and a casting chamber corresponding to the plastic member 3 is formed. The upper mold 4 is then clamped downward such that the upper positioning groove 4a covers the second semicircular ring 2 b. After the mold is closed, the injection runner 4c corresponds to any hole of one group k of holes on the second semicircular ring 2 b.
S5: molten plastic is poured into the injection runner 4c until the molten plastic fills the pouring chamber formed by the annular space e, the hole group k and the molding groove 5 c.
S6: after the plastic part 3 is solidified and formed in the pouring cavity, the upper die 4 is opened upwards, and the sleeve body 1, the first semicircular ring 2a, the second semicircular ring 2b and the plastic part 3 which are solidified into a whole are taken out.
Thus, the manufacture of a righting assembly a is completed. The above steps S1-S6 are then repeated to produce the desired number of centralizers A for the casing. Further, for convenience of continuous manufacture, a rectangular key block f corresponding to the key groove 1b is arranged at the bottom of the lower avoidance groove 5 b. Because the key groove 1b corresponds to the outer positioning block 3a beside, the key groove 1b is matched with the rectangular key block f, and the outer positioning blocks 3a on each centralizing assembly A can be continuously manufactured according to the phase angle of 120 degrees, so that the injection molding production efficiency is improved, and the accuracy of the phase angle of 120 degrees is ensured.
Likewise, please refer to fig. 3 and 8, the connecting hole a is arranged along the tangential direction of the sleeve 2, after the first semicircle ring 2a is placed in the lower positioning groove 5a, the 4 connecting holes a can be vertically arranged and just sleeved on the four positioning convex columns d vertically arranged, so that the positioning effect can be achieved, the hole group k in the middle of the first semicircle ring 2a can be guaranteed to correspond to the forming groove 5c, and the product pouring efficiency and quality are improved.
Referring to fig. 6, 7, 9 and 10, the injection molding runner 4c includes a main runner g and a first sub-runner h communicated with the main runner g, two ends of the first sub-runner h are respectively communicated with a second sub-runner i and a third sub-runner j, two end parts of the second sub-runner i and the third sub-runner j are respectively provided with a pouring opening m, the pouring opening m at two ends of the second sub-runner i corresponds to two upper round holes k1 of the second semicircular ring 2b, and the pouring opening m at two ends of the third sub-runner j corresponds to two lower round holes k2 of the second semicircular ring 2 b. So design, four pouring mouths m just in time correspond with four round holes on the second semicircle ring 2b, not only can promote and pour efficiency, and four pouring mouths m are for the upper and lower direction symmetry setting of plastics part moreover, help promoting the product quality after the molten plastic cooling, have better homogeneity.
In this embodiment, the lower avoidance groove 5b and the lower positioning groove 5a are semicircular grooves and are concentrically arranged, and the upper positioning groove 4a and the upper avoidance groove 4b are also semicircular grooves and are concentrically arranged. After the sleeve centralizer is placed in the die, because a sliding gap c is formed between the first semicircular ring 2a and the second semicircular ring 2b and the groove wall of the annular groove 1a, the concentric arrangement can play a role in self-aligning, and the sleeve body 1, the sleeve 2 and the plastic part 3 are ensured to have good coaxiality after injection molding.
As shown in fig. 7 and 8, the lower avoidance groove 5b and the upper avoidance groove 4b are respectively provided with a sealing gasket 7, and the sealing gaskets 7 are graphite sealing parts, so that the design can prevent molten plastics from overflowing, and the sealing gaskets can resist high temperature and have longer service life.
As shown in fig. 5, in order to prevent the mold clamping from being affected by the cantilever force generated by the excessive length of the sleeve during the injection molding of the mold, support tables 9 are disposed on both sides of the injection mold B in the present embodiment, and carrier rollers 9a are provided on the support tables 9.
Referring to fig. 11 and 12, the application further provides a casing centralizer with a second structure, which comprises a casing body 1 and a centralizing assembly a distributed along the length direction of the casing body 1, wherein the centralizing assembly a comprises a plastic part 3 and a sleeve 2, as can be seen from fig. 13, the sleeve 2 is sleeved on the casing body 1, an annular space e is formed between the sleeve 2 and the casing body 1, a hole group k is arranged on the sleeve 2, the plastic part 3 comprises an outer positioning block 3a, an inner connecting part 3b positioned in the annular space e and a transition structure 3c positioned in the hole group k, the outer positioning block 3a is fixedly connected with the inner connecting part 3b through the transition structure 3c, and the inner connecting part 3b is fixedly connected with the casing body 1; the sleeve 2 and the sleeve body 1 are provided with an axial limiting structure, in an initial state, the inner connecting part 3b is fixedly connected with the sleeve body 1, and after the connection between the inner connecting part 3b and the sleeve body 1 is disconnected, the righting assembly A can rotate along the circumferential direction of the sleeve body 1.
In this embodiment, the righting component a further includes a fixing ring 10 disposed at the upper and lower ends of the corresponding sleeve 2, the fixing ring 10 is an axial limiting structure, the upper and lower ends of the sleeve 2 are rotatably sleeved on the corresponding fixing ring 10, the fixing ring 10 is fixedly sleeved on the sleeve body 1, the inner connecting portion 3b is an arc-shaped sheet structure, the arc-shaped sheet structure is adhered to the sleeve body 1, the transition structure 3c is a plastic screw or a metal screw, and the outer positioning block 3a is locked on the inner connecting portion 3b through three screws. The outer positioning block 3a and the inner connecting portion 3b are made of resin.
Because the inner connecting part 3b is connected to the surface of the sleeve body 1 by adopting an adhesive process, the plastic part 3 can be very stably kept in the sleeve 2 in an initial state, and the outer positioning block 3a can well position and support the well wall of an open hole well and has a radial abutting force meeting the requirement. When the dragging pressure is too large and the pipe cannot be further pulled down due to friction resistance, the sleeve body 1 can be actively and repeatedly screwed, the adhesive force of the surface of the inner connecting portion 3b is broken through, the inner side surface of the inner connecting portion 3b slides relative to the annular groove 1a, and the plastic part 3 rotates along the circumferential direction of the sleeve body 1. The plastic part 3 moves in the state, so that the position relation between the outer positioning block 3a and the open hole well wall can be changed, the original stress state is broken, the possibility that the outer positioning block 3a passes downwards can be effectively improved through continuous try, and the technical problem that the centralizer is difficult to drop or fails due to overlarge dragging pressure is solved.
In a fourth embodiment, the application provides a production method for manufacturing the casing centralizer according to the third embodiment, and the technical difficulty of the method is how to integrally assemble the plastic component 3 on the outer side of the casing body 1. The method specifically comprises the following steps:
step one: the surface treatment of the sleeve body 1 removes the anti-corrosion and rust-proof paint on the surface of the sleeve body 1, and the sleeve body is polished by an electric grinding wheel, a steel wire brush or coarse sand paper and the like, so that the surface roughness is improved, and the sleeve body is wiped by a cleaning agent to clean the bonding surface, so that the bonding firmness is improved.
Step two: the inner connecting portion 3b of the arc-shaped sheet structure is adhered to the surface of the sleeve body 1.
Step three: the sleeve 2 is sleeved on the sleeve body 1, the inner connecting part 3b is clamped between the sleeve 2 and the sleeve body 1, and two fixing rings 10 are respectively assembled at the upper end and the lower end of the sleeve 2 in a bonding, welding or riveting mode.
Step four: the outer positioning block 3a is locked to the inner connecting portion 3b by three screws.
Step five: after the assembly is completed, the sleeve is placed in a wind-shielding, rain-shielding and dust-free environment for curing, and the curing time of the glue is generally 2-3 hours. And after the glue is completely solidified, the clamping time of the special tool is kept for 24 hours, so that a better pasting effect is ensured.
In the second step, a binder is selected, and in this embodiment, a high-strength adhesive suitable for adhering the resin of the inner connecting portion 3b and the steel of the sleeve body 1 is selected, so that two materials with different properties of the resin and the steel can be effectively adhered together. The adhesive consists of two components, namely a main adhesive and a curing agent, wherein the main adhesive and the curing agent are fully and uniformly mixed according to a specified proportion when in use, and the adhesive is used up within a specified usable time, and the residual adhesive is not reused.
In the second step, the mixed adhesive is smeared on the surface of the treated sleeve body 1, and the smearing force is uniform; then the inner connecting part 3b is put on the surface of the sleeve body 1 coated with the adhesive, repeatedly pressed, the material is ensured to be fully contacted with the surface, and clamped by a special tool, so that the firm adhesion is achieved.
The technical application prospect of adopting an adhesive process to set the centralizing structure comprises the following steps:
1. aiming at complex well conditions such as repeated fracturing of a horizontal well, sidetracking of an old well and the like, the conventional casing centralizer is difficult to fix, has small annular space, large friction resistance and casing running, and the like, and the adhesive casing centralizer can effectively solve the problems and improve the well cementation quality;
2. by combining the complex well bore condition, the special centralizer structure design and the optimization of special high-performance resin materials and high-strength high-temperature binders have the advantages of small friction force, wear resistance, small torque and CO resistance 2 And H 2 S corrosion, impact resistance and other characteristics, so that the casing can be ensured to smoothly enter the well;
3. the indoor loading test shows that the compressive strength of the adhesive casing centralizer reaches 30MPa, the shearing force can reach 98.70kN, and the casing underground operation requirement can be completely met.
Finally, it should be noted that the above description is only a preferred embodiment of the present application, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the application as defined in the appended claims.
Claims (12)
1. The utility model provides a sleeve pipe centralizer, includes sleeve pipe body (1) and follows sleeve pipe body (1) length direction array distribution's righting subassembly (A), its characterized in that: the centralizing assembly (A) comprises a plastic part (3) and a sleeve (2), wherein the sleeve (2) is sleeved on the sleeve body (1), an annular space (e) is formed between the sleeve (2) and the sleeve body (1), a plurality of hole groups (k) are formed in the sleeve (2), the plastic part (3) comprises an outer positioning block (3 a), an inner connecting part (3 b) positioned in the annular space (e) and transition structures (3 c) positioned in the hole groups (k), the outer positioning block (3 a) is fixedly connected with the inner connecting part (3 b) through the transition structures (3 c), and the inner connecting part (3 b) is fixedly connected with the sleeve body (1);
an axial limiting structure is arranged between the sleeve (2) and the sleeve body (1), the inner connecting part (3 b) is fixedly connected with the sleeve body (1) in an initial state, and the centralizing assembly (A) can rotate along the circumferential direction of the sleeve body (1) after the connection between the inner connecting part (3 b) and the sleeve body (1) is disconnected;
the outer positioning blocks (3 a) on the centralizing assemblies (A) are sequentially arranged in the circumferential direction of the sleeve body (1).
2. The casing centralizer of claim 1, wherein: the centering component (A) further comprises fixing rings (10) which are arranged at the upper end and the lower end of the corresponding sleeve (2), the upper end and the lower end of the sleeve (2) are sleeved on the corresponding fixing rings (10) in a rotatable mode, the fixing rings (10) are fixedly arranged on the sleeve body (1), the inner connecting part (3 b) is of an arc-shaped sheet structure and is adhered to the sleeve body (1), the transition structure (3 c) is a screw, and the outer positioning block (3 a) is fixedly connected with the inner connecting part (3 b) through at least two transition structures (3 c).
3. The casing centralizer of claim 2, wherein: the fixing ring (10) is fixed on the sleeve body (1) in an adhesive, welding or riveting mode.
4. The casing centralizer of claim 1, wherein: the outer positioning block (3 a), the inner connecting portion (3 b) and the transition structure (3 c) are integrally injection molded, the plastic part (3) has elasticity, the inner connecting portion (3 b) is of a cylindrical structure, when the outer positioning block (3 a) receives friction resistance, the sleeve body (1) is screwed, and the inner side surface of the inner connecting portion (3 b) can slide relative to the annular groove (1 a).
5. The casing centralizer of claim 4, wherein: the sleeve (2) comprises a first semicircular ring (2 a) and a second semicircular ring (2 b) which are arranged right opposite to each other, wherein the inner sides of the upper end and the lower end of the first semicircular ring (2 a) are respectively provided with a first arc-shaped positioning protrusion (2 a 1) formed along the outline direction of the first semicircular ring, the inner sides of the upper end and the lower end of the second semicircular ring (2 b) are respectively provided with a second arc-shaped positioning protrusion (2 b 1) formed along the outline direction of the second semicircular ring, the end parts of the first arc-shaped positioning protrusions (2 a 1) and the second arc-shaped positioning protrusions (2 b 1) are respectively provided with a connecting hole (a), and the first semicircular ring (2 a) and the second semicircular ring (2 b) are locked into a whole through threaded fasteners (b) penetrating through the connecting holes (a).
6. The casing centralizer of claim 5, wherein: a sliding gap (c) is formed between the first arc-shaped positioning protrusion (2 a 1) and the second arc-shaped positioning protrusion (2 b 1) and the groove wall of the annular groove (1 a).
7. The casing centralizer of claim 5, wherein: the number of the hole groups (k) is three, one group is arranged at the middle position of the first semicircular ring (2 a), the other two groups are symmetrically arranged on the second semicircular ring (2 b), the connecting holes (a) are arranged along the tangential direction of the sleeve (2), and key grooves (1 b) are formed in the positions, close to the end parts of the outer positioning blocks (3 a), of the sleeve body (1).
8. The casing centralizer of claim 7, wherein: each group of holes (k) comprises an upper round hole (k 1) positioned at the upper part of the sleeve (2), a lower round hole (k 2) positioned at the lower part of the sleeve (2), and strip-shaped holes (k 3) distributed between the upper round hole (k 1) and the lower round hole (k 2).
9. The casing centralizer of claim 8, wherein: the strip-shaped holes (k 3) are distributed alternately in two rows.
10. A method of manufacturing the casing centralizer of claim 8, comprising the steps of:
s1: preparing the sleeve body (1), a first semicircular ring (2 a) and a second semicircular ring (2 b), wherein the number of the first semicircular ring (2 a) and the second semicircular ring (2 b) is consistent with the number of annular grooves (1 a) on the sleeve body (1);
s2: the first semicircular ring (2 a) and the second semicircular ring (2 b) are fixedly sleeved on the circumference of the annular groove (1 a) of the sleeve body (1) by using a threaded fastener (b);
s3: preparing an injection mold (B); the injection mold (B) comprises an upper mold (4) and a lower mold (5), wherein a lower positioning groove (5 a) and a lower avoidance groove (5B) are formed in the upper end of the lower mold (5), the lower avoidance groove (5B) is formed in the two ends of the lower positioning groove (5 a), the lower positioning groove (5 a) is matched with the first semicircular ring (2 a), an upper positioning groove (4 a) and an upper avoidance groove (4B) are formed in the lower end of the upper mold (4), the upper avoidance groove (4B) is formed in the two ends of the upper positioning groove (4 a), and the upper positioning groove (4 a) is matched with the second semicircular ring (2B); an injection molding runner (4 c) communicated with an upper positioning groove (4 a) is arranged in the upper die (4), a downward concave forming groove (5 c) is formed in the lower surface of the lower positioning groove (5 a), and the forming groove (5 c) is matched with the outer positioning block (3 a); the lower surface of the lower positioning groove (5 a) is provided with a positioning convex column (d) which is matched with the connecting hole (a);
s4: placing the first semicircular ring (2 a) in a lower positioning groove (5 a) of a lower die (5), sleeving a corresponding connecting hole (a) on a positioning convex column (d), and then closing the upper die (4) downwards, so that the upper positioning groove (4 a) covers the second semicircular ring (2 b); at this time, two ends of the sleeve body (1) are positioned in the upper avoidance groove (4 b) and the lower avoidance groove (5 b);
s5: pouring molten plastic into the injection runner (4 c) until the annular space (e), the hole group (k) and the forming groove (5 c) are filled with the molten plastic;
s6: after cooling and preserving heat for a certain time, the upper die (4) is opened upwards, and the sleeve body (1) and the first semicircular ring (2 a), the second semicircular ring (2 b) and the plastic part (3) which are solidified into a whole are taken out.
11. The production method according to claim 10, characterized in that: rectangular key blocks (f) which are matched with the key grooves (1 b) are arranged at the bottoms of the lower avoidance grooves (5 b).
12. The production method according to claim 11, characterized in that: injection runner (4 c) are including main runner (g) and with the first subchannel (h) of main runner (g) intercommunication, first subchannel (h) both ends communicate respectively has second subchannel (i) and third subchannel (j), the both ends tip of second subchannel (i) and third subchannel (j) all is equipped with pours mouth (m), and wherein, pouring mouth (m) at second subchannel (i) both ends corresponds with two round holes (k 1) on second semicircle ring (2 b), and pouring mouth (m) at third subchannel (j) both ends corresponds with two round holes (k 2) down of second semicircle ring (2 b).
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