CN117646613A

CN117646613A - Rubber ring sealing soluble bridge plug and system

Info

Publication number: CN117646613A
Application number: CN202311476921.0A
Authority: CN
Inventors: 张勇; 张国田; 王兴燕; 胡志燕; 陈省身; 赵贺谦; 王方明; 李兴杰; 陈晓军; 王瑞霄; 张立刚; 李明健
Original assignee: China National Petroleum Corp; CNPC Engineering Technology R&D Co Ltd; Beijing Petroleum Machinery Co Ltd
Current assignee: China National Petroleum Corp; CNPC Engineering Technology R&D Co Ltd; Beijing Petroleum Machinery Co Ltd
Priority date: 2023-11-08
Filing date: 2023-11-08
Publication date: 2024-03-05

Abstract

The invention discloses a rubber ring sealing soluble bridge plug and a system. The soluble bridge plug comprises: the conical surface body, the sealing component, the anchoring block and the lower joint; the conical surface body is provided with a first conical surface, the anchoring block is provided with a second conical surface matched with the first conical surface, the sealing component is provided with a third conical surface matched with the first conical surface, the sealing component and the anchoring block are sequentially sleeved on the conical surface body, and the anchoring block is connected with the lower joint; the seal assembly is used for sealing the annular space between the conical surface body and the sleeve pipe, and comprises: a baffle ring, a sealant ring and a limit hoop which are sleeved on the conical surface body in sequence; the sealant ring is made of a soluble elastic material, and the conical surface body, the anchoring block, the lower joint, the baffle ring and the limiting hoop ring are made of a soluble metal material; the sealant ring includes: the sealing device comprises a rubber ring body, a sealing groove arranged on the inner wall of the rubber ring body, a plurality of sealing bosses arranged on the outer wall of the sealing rubber ring, and sealing bosses arranged on two sides of the sealing groove. The bridge plug setting effect can be improved while the bridge plug structure is simplified.

Description

Rubber ring sealing soluble bridge plug and system

Technical Field

The invention relates to the technical field of oil and gas drilling and fracturing, in particular to a rubber ring sealing soluble bridge plug and a system.

Background

The bridge plug plays a role in sealing an oil-gas well in drilling operation, and has the characteristics of few construction procedures, accurate clamping and sealing positions, large fracturing scale and the like. In the petroleum industry, bridge plugs are commonly used to effect procedures such as packing. The soluble bridge plug is a novel layering and sectionally reforming tool for shale gas fracturing, which is developed on the basis of cast iron drillable bridge plugs and composite drillable bridge plugs, and can realize complete dissolution of the bridge plug body by means of the temperature of a shaft and a certain mineralization liquid environment after fracturing is completed, so that the full-drift diameter production of the shaft is ensured, and the method has the advantages of low comprehensive cost, short production time, reduction of operation risk and realization of secondary reformation.

The soluble bridge plugs commonly used at present are mainly soluble bridge plugs with a sol barrel sealing structure and soluble bridge plugs with a metal sealing structure. The bridge plug with the sol barrel structure has a complex structure, the sealing can be realized by extruding the deformation of the glue barrel, the setting and bearing effects of the annular sleeve are good, but the volume of the glue barrel is large, the dissolution rate of the soluble glue barrel after the fracturing construction is finished is slow, and more residues are dissolved, so that drilling and grinding well dredging operation is needed to avoid influencing the production of flowback; and the number of sections of the horizontal well staged fracturing construction is gradually increased, the number of the soluble bridge plugs which are put in is correspondingly increased, and fragments which are remained by dissolution of the sol barrel are piled up at the bottom of the well, so that the construction is complex in the well dredging process easily, and the operation period and the cost are increased. The metal sealing structure soluble bridge plug has a simple structure, the whole structure is formed by processing magnesium alloy, the drift diameter is large, the dissolution speed is high, and the bridge plug of the metal sealing structure is easy to crush and deform due to poor stability of the metal sealing ring, so that the bridge plug of the metal sealing structure is difficult to seal a sleeve with a large annulus, the bearing capacity is poor, and the sleeve applicability and the pressure-resistant stability have certain defects.

Disclosure of Invention

In view of the above, the inventors of the present application have devised improvements in sealing structure bridge plugs and metal sealing structure soluble bridge plugs in combination with the needs of the actual situation to provide a rubber ring sealing soluble bridge plug and system that overcomes or at least partially solves the above problems.

The embodiment of the invention provides a rubber ring sealing soluble bridge plug, which comprises the following components: the conical surface body, the sealing component, the anchoring block and the lower joint;

the conical surface body is provided with a first conical surface, the anchoring block is provided with a second conical surface matched with the first conical surface, the sealing component is provided with a third conical surface matched with the first conical surface, the sealing component and the anchoring block are sequentially sleeved on the conical surface body, and the anchoring block is connected with the lower joint;

the seal assembly is used for sealing an annulus between the conical surface body and the sleeve, and comprises: the baffle ring, the sealant ring and the limiting hoop are sequentially sleeved on the conical surface body along the large diameter end to the small diameter end of the conical surface body;

the sealant ring is made of a soluble elastic material, and the conical surface body, the anchoring block, the lower joint, the baffle ring and the limiting hoop are made of a soluble metal material;

the sealant ring includes: the sealing ring comprises a rubber ring body, and a sealing groove arranged on the inner wall of the rubber ring body, wherein a plurality of sealing bosses are arranged on the outer wall of the sealing rubber ring, and the sealing bosses are arranged on two sides of the sealing groove.

In an alternative embodiment, the maximum width of the rubber ring body is 10-30mm;

the maximum thickness of the sealing rubber ring is 10mm-20mm, and the maximum thickness of the sealing boss is 1mm-3mm.

In an alternative embodiment, the maximum outer diameter of the sealing boss is less than 0.2-1mm of the maximum outer diameter of the lower joint.

In an alternative embodiment, the maximum width of the sealing groove is 1/2-3/5 of the maximum width of the rubber ring body;

the radial distance between the bottom of the sealing groove and the outer wall of the rubber ring body is not less than 5mm.

In an alternative embodiment, the soluble elastomeric material is a soluble polymeric material.

In an alternative embodiment, the soluble metal of the limiting hoop is a soluble metal with 20% -30% of elongation, and one end of the limiting hoop is provided with a step hole for being matched with an annular groove of an anchoring block so as to connect the limiting hoop with the anchoring block;

an annular groove is formed in the outer wall of the limiting hoop ring, and the annular groove can be used for placing a sealing ring;

the maximum width of the annular groove is 1/5-1/3 of the maximum width of the limit hoop, and the depth of the annular groove 61 is not less than 1/2 of the maximum width of the annular groove.

In an alternative embodiment, one end of the conical surface body is provided with a conical hole;

the outer wall of the large diameter end of the conical surface body is provided with a plurality of blind holes along the circumferential direction, and/or the inner wall of the conical surface body is provided with a plurality of through-flow grooves along the axial direction for contacting with fluid.

In an alternative embodiment, the diameter of the blind hole is 8-16mm, the depth is 15-20mm, and the radial distance between the bottom of the blind hole and the inner wall of the conical surface body is not less than 5mm.

In an alternative embodiment, the radial distance of the bottom of the launder from the first conical surface of the conical surface body is not less than 8mm.

In an alternative embodiment, a guiding groove is arranged on the end face of the anchoring block, and correspondingly, a guiding boss matched with the guiding groove is arranged on the lower joint so as to limit the anchoring block in the circumferential direction;

and the second conical surface of the anchoring block is provided with a first latch close to one end of the lower joint, and correspondingly, the outer surface of the small-diameter end of the conical surface body is provided with a second latch matched with the first latch so as to limit the anchoring block through the cooperation of the first latch and the second latch.

In an alternative embodiment, the inner bore of the lower joint is provided with a release thread to be connected with a release mandrel by the release thread;

and a plurality of tight thread holes are arranged on the lower joint and are used for installing set screws so as to limit the releasing mandrel through the set screws.

In an alternative embodiment, the elastomeric ring seal of the present embodiment of the invention may further comprise: the sealing ball is used for sealing the conical hole of the conical surface body;

the sealing ball is a ball body formed by connecting two hollow hemispheres through threads, a sealing ring is arranged on the contact surface of the two hollow hemispheres, and the wall thickness of the sealing ball is 5-10mm.

Based on the same inventive concept, the embodiment of the invention also provides a rubber ring sealing soluble bridge plug system, which comprises: releasing the mandrel, pushing the cylinder and the rubber ring sealing soluble bridge plug;

the releasing mandrel is connected with the lower joint through releasing threads, and the releasing mandrel is radially limited through a set screw;

the pushing cylinder is abutted with the step of the conical surface body.

In an alternative embodiment, the releasing mandrel is provided with a central runner, and one end of the releasing mandrel, which is close to the pushing cylinder, is provided with a plurality of radial overflow holes communicated with the central runner along the circumferential direction;

The circumference of the pushing cylinder is provided with a plurality of through holes, so that the well bottom fluid flows through the through holes and flows into the central flow passage through the radial holes and then flows out.

The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:

according to the rubber ring sealing soluble bridge plug provided by the embodiment of the invention, the sealing assembly is a combined wedge-shaped sealing structure formed by overlapping the elastic sealing rubber ring, the rigid baffle ring and the limiting hoop, the elastic sealing rubber ring is greatly deformed after being compressed, the rigid baffle ring and the limiting hoop are high in strength and good in temperature resistance, and the baffle ring and the limiting hoop are used for carrying out bidirectional support and protection on the sealing rubber ring in the setting process, so that the sealing pressure bearing capacity of the soluble bridge plug is improved; because the deformation of the elastic sealing glue ring is larger, the compression resistance is better, compared with the existing metal sealing ring sealing structure, the reliability is improved, the sealing glue ring is more suitable for sealing large annular casings, and the sealing bearing capacity of the soluble bridge plug and the applicability of the casings are improved; and be provided with seal groove structure on the seal gum ring inner wall, in the setting process, the seal gum ring is along conical surface expansion and compress gradually, under the two-way spacing effect of spacing hoop and baffle ring, seal groove is packed by extrusion, seal gum ring and conical surface body contact part tighten up, the outer circle middle part is protruding, can form the sealed face of certain width when contacting with the sleeve pipe inner wall, thereby can further improve the deflection of seal gum ring, and combine the sealed boss structure that sets up on the outer wall can reduce required seal gum ring size when further strengthening seal gum ring's sealed effect, compare in current can sol section of thick bamboo bridging plug structure, the residue when dissolving has been reduced the packing element, the speed of dissolving has been improved, guarantee the quick general oil gas well of a general oil gas well, put into production, reduce construction cycle and economic cost, and because spacing hoop is in bridging plug setting or pressure-bearing process, the required holding power of seal gum ring is provided for, under the required size reduction of seal gum ring, can reduce spacing hoop and take place fracture or inhomogeneous supporting ring, and then the problem of sealing position poor to the sealing position appears in order to seal ring to seal.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.

The technical scheme of the invention is further described in detail through the drawings and the embodiments.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. Wherein the dotted line and the dashed line in the drawing are auxiliary lines.

In the drawings:

FIG. 1 is a schematic diagram of a rubber ring seal soluble bridge plug in an embodiment of the invention;

FIG. 2 is a cross-sectional view of a sealant ring of an embodiment of the present invention with the sealant ring sealing a soluble bridge plug;

FIG. 3 is a front cross-sectional view of a retainer structure for a rubber ring sealed soluble bridge plug in accordance with an embodiment of the present invention;

FIG. 4 is a right side view schematically illustrating a retainer structure for a rubber ring sealed soluble bridge plug in accordance with an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a conical surface of a rubber ring sealed soluble bridge plug in an embodiment of the present invention;

FIG. 6 is an enlarged view of a portion of a second latch of a cone of a rubber ring sealed soluble bridge plug in accordance with an embodiment of the present invention;

FIG. 7 is a schematic view of an anchoring segment of a rubber ring sealed soluble bridge plug;

FIG. 8 is a schematic view of the lower joint structure of the rubber ring sealed soluble bridge plug;

FIG. 9 is a schematic view of a sealing ball structure of a rubber ring sealing soluble bridge plug according to an embodiment of the present invention;

FIG. 10 is a partial block diagram of the operational state of the setting anchor of a rubber ring sealed soluble bridge plug in an embodiment of the present invention;

FIG. 11 is a schematic illustration of a push-tube structure of a rubber ring sealed soluble bridge plug in an embodiment of the present invention;

fig. 12 is a schematic diagram of a releasing mandrel of a rubber ring sealed soluble bridge plug in an embodiment of the invention.

Reference numerals illustrate:

1. pushing a cylinder; 2. releasing the mandrel; 3. a conical surface body; 4. a baffle ring; 5. a sealant ring; 6. a limit hoop; 7. an anchor block; 8. anchoring teeth; 9. a hoop; 10. a lower joint; 11. tightly fixing the threaded hole; 12. a sealing ball; 13. a sleeve;

21. radial overflow holes; 22. a central flow passage; 31. a blind hole; 32. a flow trough; 33. a second latch; 34. a tapered bore; 51. a rubber ring body; 52. sealing the boss; 53. sealing the groove; 61. an annular groove; 71. a mounting hole; 72. a guide groove; 73. a first latch, 101, a guide boss; 110. and a through hole.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

The inventor of the application finds that as the bridge plug rubber cylinder of the sealing structure of the sol cylinder is large in volume, the dissolution rate of the sol cylinder is low after the fracturing construction is finished, more residues are dissolved, drilling and grinding well dredging operation is often needed, and the influence on flowback production is avoided; the number of sections of the horizontal well staged fracturing construction is increased gradually, the number of the soluble bridge plugs which are put in is increased correspondingly, fragments of soluble residues can be accumulated at the bottom of the well, construction is complex in the well dredging process easily, and the operation period and cost are increased; the bridge plug of the metal sealing structure has the advantages of high dissolution speed, limited effective packing time, relatively high requirement on working conditions, and poor stability and easy crushing deformation of the metal sealing ring, so that the bridge plug of the metal sealing structure has certain defects of poor pressure bearing capacity, sleeve applicability and pressure-resistant stability for the sleeve with large annular space.

The existing soluble bridge plug also adopts an expansion type soluble cylinder sealing structure, the structure completely depends on the elastic expansion of the soluble cylinder and is axially extruded to realize sealing, and as the hardness of the soluble rubber material is relatively low and the temperature adaptability is not strong, the pressure bearing capacity and the temperature resistance under the well are relatively poor, and in order to meet the sealing requirement of the bridge plug, a plurality of check rings are usually required to be arranged at the lower end of the soluble cylinder for supporting protection; in the bridge plug setting or bearing process, a plurality of stacked check rings often break or deform unevenly, so that the situation that the rubber cylinder is not supported in place and the sealing and bearing effects are poor occurs.

In view of the foregoing, and in combination with the needs of practical situations, the inventors of the present application have improved a sealing structure bridge plug and a metal sealing structure soluble bridge plug, and have proposed embodiments of the present invention to provide a rubber ring sealing soluble bridge plug and a system that overcome or at least partially solve the foregoing problems. It should be noted that, in the embodiment of the present invention, an end of the bridge plug, which is close to the wellhead during the lowering process, is referred to as an upper end, and an end of the bridge plug, which is far from the wellhead, is referred to as a lower end.

The rubber ring sealing soluble bridge plug provided by the embodiment of the invention, referring to fig. 1, 2 and 10, comprises: conical surface body 3, sealing component, anchoring block 7 and lower joint 10;

the conical surface body 3 is provided with a first conical surface, the anchoring block 7 is provided with a second conical surface matched with the first conical surface, the sealing component is provided with a third conical surface matched with the first conical surface, the sealing component and the anchoring block 7 are sequentially sleeved on the conical surface body 3, and the anchoring block 7 is connected with the lower joint 10;

the seal assembly is used for sealing the annulus between the conical surface body 3 and the sleeve 13, and comprises: a baffle ring 4, a sealant ring 5 and a limiting hoop 6 which are sequentially sleeved on the conical surface body 3 along the large diameter end to the small diameter end of the conical surface body 3;

the sealant ring 5 is made of a soluble elastic material, and the conical surface body 3, the anchoring block 7, the lower joint 10, the baffle ring 4 and the limiting hoop ring 6 are made of a soluble metal material;

The sealant ring 5 includes: the sealing ring comprises a rubber ring body 51, a sealing groove arranged on the inner wall of the rubber ring body 51, a plurality of sealing bosses 52 arranged on the outer wall of the sealing rubber ring 5, and the sealing bosses 52 arranged on two sides of the sealing groove.

According to the rubber ring sealed soluble bridge plug provided by the embodiment of the invention, the sealing assembly is a combined wedge-shaped sealing structure formed by overlapping the elastic sealing rubber ring 5, the rigid baffle ring 4 and the limiting hoop ring 6, the elastic sealing rubber ring 5 is greatly deformed after being compressed, the rigid baffle ring 4 and the limiting hoop ring 6 are high in strength and good in temperature resistance, and the sealing rubber ring 5 is supported and protected in a bidirectional manner by the baffle ring 4 and the limiting hoop ring 6 in the setting process, so that the sealing pressure bearing capacity of the soluble bridge plug is improved; because the deformation of the elastic sealing glue ring 5 is larger, the compression resistance is better, compared with the existing metal sealing ring sealing structure, the reliability is improved, the sealing glue ring is more suitable for sealing the large annular sleeve 13, and the sealing bearing capacity of the soluble bridge plug and the applicability of the sleeve 13 are improved; and be provided with seal groove structure on the seal gum ring 5 inner wall, in the setting process, seal gum ring 5 expands along the circular conical surface and compresses gradually, under spacing hoop 6 and the two-way spacing effect of keeping off ring 4, seal groove is pressed and filled, seal gum ring 5 is tightened up with conical surface body 3 contact portion, the outer circle middle part is protruding, can form the sealed face of certain width when contacting with sleeve pipe 13 inner wall, thereby can further improve the deflection of seal gum ring 5, and combine the sealed boss 52 structure that sets up on the outer wall can reduce required seal gum ring 5 size when further reinforcing seal gum ring 5's sealed effect, compare in current soluble cylinder bridging structure, residue when dissolving has been reduced the packing element, the speed of dissolving has been improved, guarantee unconventional oil gas well's quick open well, put into production, reduce construction cycle and economic cost, and because spacing hoop 6 is in bridging setting or pressure-bearing process, required support force for seal gum ring 5 is provided, under the circumstances that seal gum ring 5 required support force also reduces correspondingly in the size reduction, can reduce seal hoop 5's required support force and take place the fracture and can take place in order to seal ring 5 evenly or the poor sealing effect, the problem of sealing ring is not bearing in the sealing process occurs.

Further, with the sealant ring 5, an effective seal cannot be achieved if its size is too small. When the size of the sealing rubber ring 5 is too large, the overall length of the bridge plug can be increased, so that the dissolution speed of the bridge plug can be influenced, and meanwhile, when the size of the sealing rubber ring 5 is too large, the overall strength and the pressure-bearing stability of the sealing rubber ring 5 can be weakened; thus, alternatively, the maximum width of the glue ring body 51 of the sealing glue ring 5 may be 10-30mm; the maximum thickness of the sealing rubber ring 5 is 10mm-20mm, the maximum thickness of the sealing boss 52 is 1mm-3mm, it is to be noted that the maximum width of the rubber ring body 51 is the maximum axial dimension of the rubber ring body 51, the maximum thickness of the sealing rubber ring 5 is the thickness of the maximum outer diameter of the sealing boss 52, and the maximum thickness of the sealing boss 52 is the radial distance between the outer wall of the rubber ring body 51 and the maximum outer diameter of the sealing boss 52. The dimensions of the width, thickness, etc. of the sealant ring 5 are not particularly limited in the embodiment of the present invention, and may be selected according to the size of the annulus between the bridge plug and the casing 13; specifically, the larger the annulus between the bridge plug and the sleeve 13, the larger the volume of the rubber ring is required, and the larger the width and thickness of the sealing rubber ring 5 are required, so that the sealing area (sealing band) with enough length can be realized when the annulus is larger, and the soluble bridge plug can bear enough pressure on the basis of establishing effective sealing.

In an alternative embodiment, the maximum outer diameter of the sealing boss 52 is less than 0.2-1mm of the maximum outer diameter of the lower joint 10, and in general, in the bridge plug design, the outer circle of the lower joint 10 is usually the largest part of the whole bridge plug, so that the maximum outer diameter of the sealing boss 52 is less than the maximum outer diameter of the lower joint 10, and the sealing rubber ring 5 can be ensured not to directly rub against the wall of the sleeve 13 during the process of lowering the bridge plug to cause damage to the sealing rubber ring 5.

In an alternative embodiment, the maximum width of the seal groove is 1/2 to 3/5 of the maximum width of the glue ring body 51; the radial distance between the bottom of the sealing groove and the outer wall of the rubber ring body 51 is not less than 5mm, so that the strength of the sealing rubber ring 5 is ensured, and the sealing rubber ring 5 achieves larger deformation as much as possible; the sealing groove can be an annular groove with a trapezoid shape, a semicircular shape, a triangular shape and the like; the maximum width of the seal groove is the maximum length of the seal groove along the axial direction; the bottom of the sealing groove is an end face close to one end of the outer diameter of the sealing rubber ring 5; in the setting process, the sealing rubber ring 5 expands along the conical surface and gradually compresses, under the bidirectional limiting action of the limiting hoop ring 6 and the baffle ring 4, the sealing groove is extruded and filled, the contact part of the sealing rubber ring 5 and the conical surface body 3 is tightened, the middle part of the outer circle is convex, and a sealing surface with a certain width can be formed when the sealing rubber ring contacts with the inner wall of the sleeve 13, so that initial sealing is established.

Further, the soluble elastic material of the sealant ring 5 is an elastic material that can be self-taught or dissolved in a liquid at a certain temperature, for example, it can be: the sealing rubber ring 5 can be formed by pressing soluble polymer materials such as soluble rubber or soluble polyurethane through a special forming tool or a grinding tool, an inner hole is of a wedge-shaped annular structure, the inner hole is matched with the first conical surface of the conical surface body 3, the sealing rubber ring 5 can be expanded and deformed along the conical surface of the conical surface body 3 under the action of axial force, and finally is wedged into an annular space between the conical surface body 3 and the inner wall of the sleeve 13, so that the sealing rubber ring is a key part of the annular space between the sealing sleeve 13 and the conical surface body 3.

Optionally, referring to fig. 1, the whole of the limiting hoop 6 in the embodiment of the present invention is in a wedge-shaped annular structure, the inner hole is a conical surface, one side of the limiting hoop 6 is attached to the sealant ring 5, the other side is matched with the anchor block 7, specifically, one end of the limiting hoop 6 is provided with a step hole for being matched with an annular groove arranged at one end of the anchor block 7 so as to connect the limiting hoop 6 with the anchor block 7; and the anchor block 7 can be hooped, so that the limit function of the anchor block 7 is achieved. The limiting hoops 6 simultaneously play a role in providing reliable supporting protection for the sealing glue ring 5, and reduce the possibility that the sealing glue ring 5 is additionally deformed (excessively deformed) or crushed to lose sealing capability under the action of certain temperature and pressure. The whole structure of the limiting hoop 6 gradually narrows from the outer circle end to the end close to the conical surface body 3, namely the left end face and the right end face of the limiting hoop 6 are inclined planes, and are respectively contacted with the sealant ring 5 and the anchoring block 7.

Optionally, the right end face of the limiting hoop 6 is perpendicular to the first conical surface of the conical surface body 3, the taper of the first conical surface is consistent with the taper of one end, close to the limiting hoop 6, of the anchoring block 7, on one hand, the maximum component force of upward expansion of the limiting hoop 6 along the conical surface can be achieved, and on the other hand, when the anchoring block 7 expands along the conical surface body 3, the limiting hoop 6 is better pushed to expand and deform. The left end face of the limiting hoop 6 is in contact with the sealing rubber ring 5, on one hand, the expansion deformation of the limiting hoop 6 is considered, the structural design with wide outer circle and narrow inner circle is adopted, the deformation of the limiting hoop 6 is more facilitated, on the other hand, the limiting and wrapping effects on the sealing rubber ring 5 can be achieved in the process of pushing the sealing rubber ring 5 to deform, and in the pressure-bearing process after the deformation and expansion of the sealing assembly, the supporting effect of the conical surface is better than that of the plane; wherein the angle for the left end face of the spacing clip 6 may generally be selected to be 5-30 deg.. The left side face of the limiting hooping ring 6 can be further provided with a clamping groove for partially embedding the sealing glue ring 5 into the end face of the limiting hooping ring 6, and a special process can be adopted for positioning the sealing glue ring 5 and the limiting hooping ring 6 together to form a metal and rubber combined sealing ring.

Furthermore, the limiting hoops 6 need to ensure a certain ductility while ensuring enough supporting force to the sealant ring 5, and the specific size setting of the limiting hoops can be determined according to metal materials with different extensibility; preferably, the soluble metal of the limiting hoop 6 is a soluble metal with 20% -30% of elongation, so that the limiting hoop 6 ensures certain strength of elongation; the material of the limiting hoop ring 6 can also be a metal material with the elongation rate less than or equal to 20%, at this time, the width of the limiting hoop ring 6 should not exceed 15mm, otherwise, the limiting hoop ring 6 is easy to break in the radial expansion process, the integrity of the limiting hoop ring 6 is damaged, the supporting effect on the sealant ring 5 is affected, and the auxiliary sealing effect is lost.

Optionally, referring to fig. 1, an annular groove 61 may be further disposed on the outer wall of the limiting hoop 6, where the annular groove 61 may be used to place a sealing ring; the maximum width of the annular groove 61 is 1/5-1/3 of the maximum width of the limit hoop 6, and the depth of the annular groove 61 is not less than 1/2 of the maximum width of the annular groove. Specifically, the annular groove 61 provided on the outer wall of the limiting collar 6 may have an inverted triangle shape, a dovetail shape, a U shape, a rectangular shape, a semicircular shape, etc., which is not particularly limited in the embodiment of the present invention. When the limit hoop 6 slides and expands along the conical surface of the conical surface body 3, the annular groove 61 is arranged, so that the extension force required by radial expansion of the limit hoop 6 can be reduced, and the deformability of the limit hoop 6 can be improved; and under certain conditions, an O-shaped sealing ring can be arranged in the annular groove 61 to play a role in auxiliary sealing, so that the integral sealing effect of the soluble bridge plug is further improved.

Alternatively, referring to fig. 3 and 4, the baffle ring 4 of the sealing assembly is in a wedge-shaped annular structure, and specifically can be formed by attaching two wedge-shaped rings, an inner hole of the baffle ring 4 is a conical surface, one side of the baffle ring 4 is attached to the sealant ring 5, and the inner hole is matched with the first conical surface of the conical surface body 3, so that the protection effect on the sealant ring 5 is achieved, and an upper support is provided for deformation of the sealant ring 5. The baffle ring 4 can be processed by adopting a ductile soluble metal material, and is embedded into the annular space between the conical surface body 3 and the inner wall of the sleeve 13 after being radially expanded under the action of axial setting force, so that rigid pre-seal is formed, and fluid at the upper end of the bridge plug is blocked. The U-shaped grooves are formed in the inner side of the circumference of the sealing ring, after the sealing ring 4 is radially expanded, the sealing ring can be broken at the U-shaped grooves to form a C-shaped ring, so that the decomposition of the setting force in the setting process is reduced, the acting force distributed by the sealing rubber ring 5 in the setting process is increased, the deformation of the sealing rubber ring 5 can be increased, and more effective sealing is realized.

Wherein, the inner hole of the baffle ring 4, the inner hole of the sealing ring and the inner hole of the limit hoop 6 jointly form a third conical surface.

Alternatively, referring to fig. 5, the conical surface body 3 is in a conical structure, one end of the conical surface body 3 is provided with a conical hole 34, and the taper degree of the conical hole 34 can be 30 ° -45 °, so that the sealing ball 12 is pumped to the position of the conical hole 34 of the bridge plug and then is tightly attached to the conical hole 34 to establish sealing in the downhole operation process of the bridge plug.

A plurality of blind holes 31 are circumferentially arranged on the outer wall of the large diameter end of the conical surface body 3, and/or a plurality of through-flow grooves 32 are axially arranged on the inner wall of the conical surface body 3 for contacting with fluid.

The blind hole 31 and the overflow groove 32 are mainly used for increasing the contact area with fluid in a well and accelerating the dissolution speed of the conical surface body 3, so that the diameter and depth of the blind hole 31 can be increased as much as possible on the basis of ensuring the strength of the conical surface body 3 when the size of the blind hole 31 and the overflow groove 32 are arranged. Alternatively, the diameter of the blind hole 31 may be 8-16mm, the depth may be 15-20mm, and the radial distance of the bottom of the blind hole 31 from the inner wall of the cone 3 is not less than 5mm. The radial distance of the bottom of the overflow groove 32 from the first conical surface of the conical surface body 3 is not less than 8mm, the overflow groove 32 can be an annular groove with a trapezoid shape, a rectangular shape, a U shape, a V shape and the like, and the size settings of the overflow grooves 32 can be the same or different, when the sizes of the overflow grooves 32 are set to be different, the groove width and the groove depth of the overflow groove 32 can be gradually reduced from the large diameter end to the small diameter end of the conical surface body 3, and the size of the overflow groove 32 can be specifically adjusted according to the actual construction pressure, so that the strength of the conical surface body 3 can meet the requirement of underground operation.

In an alternative embodiment, the anchoring block 7 is in a split structure, and is integrally wedge-shaped after being arranged on the conical surface body 3, that is, the anchoring block 7 comprises a plurality of anchoring split blocks, the number of the anchoring split blocks can be specifically selected according to actual needs, and the number of the anchoring split blocks can be generally selected to be 6-12. The inner hole of each anchoring block is provided with a conical surface, and the angle of the inner hole is the same as that of the lower conical surface of the conical surface body 3; referring to fig. 7, the anchoring block 7 is provided with a step at one end close to the sealing assembly, the outer wall of the other end is provided with a mounting groove, and a plurality of anchoring sub-blocks are hooped into a circular whole by the cooperation of a hooping ring 9 arranged in the mounting groove and a step hole arranged at one end of the hooping ring during assembly; when the anchor blocks 7 are expanded along the conical surface body 3 by axial force, the hoops 9 are broken, the anchor blocks 7 are separated, and the anchor blocks 7 are radially expanded while further moving along the conical surface body 3 until the anchor blocks 7 are close to the inner wall of the sleeve 13.

Alternatively, referring to fig. 7, a guiding groove 72 is provided on an end surface of the anchor block 7, and correspondingly, referring to fig. 8, a guiding boss adapted to the guiding groove 72 is provided on the lower joint 10 to limit the anchor block 7 in the circumferential direction; that is, the guiding boss arranged on the end face of the lower joint 10 is in plug-in fit with the guiding groove 72 arranged on the anchoring block 7, so as to fix the circumferential position of the anchoring block 7, and the anchoring block 7 can be uniformly expanded radially along the preset direction without unbalanced load in the setting process, so that the anchoring block 7 can be uniformly anchored on the inner wall of the sleeve 13 finally, and the anchoring block 7 provides uniform thrust for the limiting hoop 6 and the sealant ring 5.

Further, referring to fig. 1 and 5, a first latch is provided at one end of the second conical surface of the anchor block 7 near the lower joint 10, and correspondingly, a second latch 33 adapted to the first latch is provided on the outer surface of the small diameter end of the conical surface body 3, so as to limit the anchor block 7 through the cooperation of the first latch and the second latch 33; specifically, the first latch and the second latch 33 may be multiple saw-tooth steps, and play roles in locking and anti-slip after the anchor block 7 is tightly attached to the conical surface body 3; fig. 6 is a partial enlarged view of the second latch 33. The inner hole at the small end of the conical surface body 3 can be further provided with a chamfer, so that the axial trafficability of the releasing mandrel 2 in the conical surface body 3 is improved.

Referring to fig. 1, in the lower connector 10 of the soluble bridge plug of the present embodiment, optionally, a plurality of blind holes 31 may be disposed on the circumference of the outer wall of the lower connector 10, so as to increase the contact area between the liquid and the body of the lower connector 10, and increase the dissolution rate. The end of the lower joint 10 far away from the conical surface body 3 can be provided with a large conical surface with a certain angle, so as to play a role in guiding the bridge plug.

The inner hole of the lower joint 10 is provided with a releasing thread so as to be connected with the releasing mandrel 2 through the releasing thread; when the releasing mandrel 2 transmits a certain axial pulling force, the releasing thread of the lower joint 10 can be sheared and broken, so that the releasing setting of the bridge plug is realized. The design of the screw thread can meet the connection of the releasing mandrel 2 and the initial state of the small joint, and can shear the releasing under the action of a certain releasing force when the underground setting is carried out; the type of the releasing thread can be selected arbitrarily, such as trapezoidal threads, triangular threads and the like, the specific size of the releasing thread is required to be determined according to the bridge plug structural design, the releasing force is mainly determined by calculating parameters such as the yield strength of materials, the width of tooth roots, the number of turns and the like, and the releasing force is verified through a shear test, and the releasing force range is generally: 120kN-180kN.

The soluble bridge plug provided by the embodiment of the invention adopts the releasing thread to shear and release, has a simpler and stable structure, and can flexibly adjust the screwing length of the thread according to actual needs to adjust the hand loss force.

Further, a plurality of tight thread holes 11 are formed in the lower connector 10 and are used for installing set screws to limit the releasing mandrel 2 through the set screws, so that the releasing mandrel 2 and the bridge plug are prevented from rotating relatively, and the functions of looseness prevention and back-off prevention are achieved. Wherein the number of set screws may be set to 1-4.

Further, referring to fig. 7, the outer circle of each flap anchoring block of the soluble bridge plug according to the embodiment of the present invention is provided with a plurality of mounting holes 71, the number of which may be generally 3-6, for embedding the anchoring teeth 8, and the anchoring teeth 8 are mainly used for gradually biting into the inner wall of the sleeve 13 under the action of axial force, so as to realize firm anchoring of the anchoring block 7. The distribution of the anchoring teeth 8 on each anchoring block can be particularly distributed on the outer surface of the anchoring block 7 in a mode of a straight line, a triangle, a rectangle, a diamond and the like according to the different quantity of the anchoring teeth 8.

Optionally, the rubber ring sealing soluble bridge plug provided by the embodiment of the invention further includes: a sealing ball 12, wherein the sealing ball 12 is used for sealing the conical hole 34 of the conical surface body 3;

Specifically, the sealing ball 12 is spherical and is made of instant material, and the diameter of the sealing ball is specifically determined by the inner diameter of the conical surface body 3; after the bridge plug is sealed underground, the sealing ball 12 is finally stuck in the conical hole 34 at the large-diameter end of the conical surface body 3 to play roles in plugging the inner hole of the bridge plug and sealing, the diameter of the sealing ball 12 is 1.25 times larger than that of the small-diameter end of the conical hole 34 of the conical surface body 3, and the contact point between the sealing ball 12 and the conical hole 34 of the conical surface body 3 is distributed near the central position of the conical hole 34 along the axial direction as far as possible when the bridge plug is arranged, so that the front end anti-rotation groove of the conical surface body 3 is avoided.

Further, the sealing ball 12 may be a solid metal ball, or a combined hollow ball, or a ball formed by combining soluble metal and soluble rubber, preferably, the structure of the sealing ball 12 is as shown in fig. 9, the sealing ball 12 may be a ball formed by connecting two hollow hemispheres through threads, and the contact surface of the two hollow hemispheres is provided with a sealing ring, so that the sealing ball 12 is provided with a hollow structure, and the sealing ball 12 can be quickly dissolved on the surface after the fracturing construction operation is completed, and the soluble ball is disintegrated to restore the inner hole channel of the bridge plug; wherein the wall thickness of the sealing ball 12 may be 5-10mm; the specific wall thickness of the sealing ball 12 can be calculated and determined according to different construction pressures and the material strength of the sealing ball 12 so as to ensure that the sealing ball 12 has enough strength to ensure that the sealing ball 12 cannot be crushed and deformed in the bridge plug setting process.

According to the rubber ring sealing soluble bridge plug provided by the embodiment of the invention, as the bridge plug is anchored and pressed by setting in the underground, the bridge plug is released by providing a certain setting force through a standard setting tool on a bridge plug lowering tool string and is set at a designated position in the sleeve 13, the anchoring block 7 radially expands and sticks to the inner wall of the sleeve 13, and the anchoring teeth 8 bite into the inner wall of the sleeve 13 to form initial anchoring; and then in the fracturing construction process, as the pressure in the shaft continuously rises, the anchoring teeth 8 further bite into the inner wall of the sleeve 13 at the moment, and the anchoring state of the bridge plug is kept stable. Thus, when the bridge plug is operated downhole, several key elements are: on one hand, the bridge plug can be smoothly released, separated from the setting tool, and forms initial anchoring and setting at the appointed position of the bottom hole casing 13; on the other hand, the bridge plug has certain sealing bearing capacity and effective bearing time under the conditions of certain temperature and mineralization degree at the bottom of the well; namely, in the fracturing construction process, under the action of certain temperature and pressure, the sealing pressure-bearing stability and anchoring reliability of the bridge plug can meet the actual technological requirements.

The operation process of the rubber ring sealing soluble bridge plug of the embodiment of the invention can be as follows:

Releasing setting of bridge plugs: referring to fig. 1, the components of the bridge plug are assembled and fixed on the releasing mandrel 2 in sequence, the left ends of the releasing mandrel 2 and the pushing cylinder 1 are respectively connected with a standard setting tool through threads, and the pushing cylinder 1 axially compresses the left end face of the conical surface body 3 by adjusting the screwing distance, so that the tight fit of the components between the conical surface body 3 of the bridge plug and the lower joint 10 is ensured.

When the setting tool works, axial thrust can be provided for the push cylinder 1, the push cylinder 1 moves axially, and under the action of the conical surface body 3 and the lower joint 10, the baffle ring 4, the sealing rubber ring 5, the limiting hoop ring 6 and the anchoring block 7 on the circumference of the conical surface body 3 have a trend of expanding along the first conical surface of the conical surface body 3, and under the action of the first conical surface, part of axial force is converted into radial force, and when the axial thrust reaches a certain value, the hoop ring 9 for hooping the anchoring block 7 is broken, and then all parts of the bridge plug expand rapidly until the bridge plug is completely abutted against the inner wall of the sleeve 13, so that the setting position of the bridge plug is locked. And after the bridge plug is locked, further under the action of axial force provided by the setting tool, the releasing threads of the lower joint 10 are sheared and pulled off instantaneously by the axial pressure applied to the releasing mandrel 2, so that releasing setting of the bridge plug is completed. At this time, the anchoring teeth 8 bite into the inner wall of the sleeve 13 by a small amount, and initial anchoring of the bridge plug is established; the baffle ring 4, the sealant ring 5 and the limiting hoops 6 are expanded to an annulus between the conical surface body 3 and the sleeve 13 along the conical surface under the action of the anchoring block 7, so as to form initial sealing; after wedging the annular space between the conical surface body 3 and the inner wall of the sleeve 13, the anchoring block 7 is mutually meshed with the zigzag step at the upper end of the conical surface body 3 through the zigzag step of the inner conical surface of the anchoring block, so that the locking of the position of the anchoring block is realized.

Sealing bearing of bridge plug: referring to the schematic of the bridge plug set anchor operating condition shown in fig. 10; the bridge plug completes initial anchoring and setting at a designated position in the well; after the locking of each component is completed; according to the fracturing construction process requirements, a sealing ball 12 is thrown in from a wellhead, and the sealing ball 12 is continuously pumped to a sealing conical surface position at the upper end of a conical surface body 3 of a well bottom bridge plug, so that setting is completed, an inner hole of the bridge plug is plugged, and integral plugging of a shaft in a sleeve 13 is realized. In the fracturing construction process, the anchoring teeth 8 further bite into the inner wall of the sleeve 13 along with the continuous rising of the pressure in the shaft, so that the bridge plug is stably anchored; and the sealing rubber ring 5 is further compacted, under the supporting protection effect of the baffle ring 4 and the limiting hoop ring 6, the sealing rubber ring 5 is in a state of being more compacted and tighter in theory, the rubber ring can deform to the greatest extent, and the sealing rubber ring is tightly attached to the sleeve 13, so that effective initial sealing is realized; thereby establishing effective sealing in the shaft and completing the bearing and fracturing construction operation for a certain time.

Rapid dissolution of bridge plug: after the fracturing construction operation is completed, the bridge plug can be automatically and rapidly dissolved under the condition of a certain temperature and mineralization degree at the bottom of the well; the components of the bridge plug body can be separated from the inner wall of the sleeve 13 along with dissolution time; eventually dissolving completely into a fine powdery residue. And the higher the bottom hole temperature and the mineralization degree, the faster the dissolution speed and the shorter the complete dissolution time.

According to the rubber ring sealing soluble rubber ring provided by the embodiment of the invention, the sealing component can move and expand on the conical surface body 3 until the sealing component is embedded into the annular control gap between the conical surface body 3 and the inner wall of the sleeve 13, so that wedge-shaped sealing is formed, a reliable sealing belt is realized, under the action of pressure, the sealing ring 4 and the limiting hoop 6 support and protect the sol barrel in a bidirectional manner, and the outer circle of the limiting hoop 6 is provided with a sealing groove structure, so that auxiliary sealing is formed.

It should be noted that, for bridge plugs, there are many dimensions, defined by an outer diameter, for example, bridge plugs having various types of outer diameters of 110mm, 105mm, 103mm, or 98mm, and the bridge plug of each type is designed with some differences, so some details regarding the bridge plug structure may be adjusted according to the overall dimension, which is not particularly limited in the embodiments of the present invention.

The embodiment of the invention provides a rubber ring sealing soluble bridge plug for the technical field of underground key tools for petroleum and natural gas drilling and fracturing, the soluble bridge plug is improved on the structure of a bridge plug with an all-metal sealing structure, a sealing assembly is formed by overlapping an elastic sol ring, a rigid baffle ring 4 and a limiting hoop ring 6 into a combined wedge-shaped sealing structure, the elastic sol ring is greatly deformed after being compressed, can be tightly attached to the wall of a sleeve 13 after being deformed, and has strong adaptability to the sleeve 13, and the rigid baffle ring 4 and the limiting hoop ring 6 have high strength and good temperature resistance; the sealing component can move and expand on the conical surface body 3 until the sealing component is embedded into the annular control gap between the conical surface body 3 and the inner wall of the sleeve 13 to form wedge-shaped sealing, a reliable sealing belt is realized, the stop ring 4 and the limiting hoop ring 6 form bidirectional support and protection on the sol barrel, and the outer circle of the limiting hoop ring 6 is provided with an annular groove structure to form auxiliary sealing. Thereby increasing the stability of the large annular sealing and the capability of bearing high temperature, high pressure and high mineralization, the size range of the application sleeve is wide, the size of the sol ring is smaller than that of the sol cylinder, and the dissolution residues are less, so that the construction period and the economic cost are fundamentally reduced.

Based on the same inventive concept, the embodiment of the present invention further provides a rubber ring sealing soluble bridge plug system, as shown in fig. 1, including: the releasing mandrel 2, the pushing cylinder 1 and the rubber ring sealing soluble bridge plug are arranged;

the releasing mandrel 2 is connected with the lower joint 10 through releasing threads, and the releasing mandrel 2 is radially limited through a set screw;

the pushing cylinder 1 is abutted against the step of the conical surface body 3.

Specifically, referring to fig. 11 and 12, the releasing mandrel 2 is provided with a central flow passage 22, and one end of the releasing mandrel 2, which is close to the pushing cylinder 1, is provided with a plurality of radial overflow holes 21 communicated with the central flow passage 22 along the circumferential direction; the circumference of the push cylinder 1 is provided with a plurality of through holes so that the well bottom fluid flows through the through holes, flows into the central flow passage 22 through the radial holes and flows out.

Referring to fig. 12, the releasing mandrel 2 is in a long rod shape, the upper end of the releasing mandrel is provided with an external thread which can be connected with a standard setting tool when the bridge plug is put down in the well, the releasing mandrel is provided with a conical step which can be matched with a conical hole 34 of the conical surface body 3, the lower end of the releasing mandrel is provided with an external thread which is connected with the releasing of an inner hole of the lower joint 10, the outer circle of the lower end of the thread is provided with a 4-8 groove, and a set screw arranged on the lower joint 10 can be tightly fixed in the groove to prevent the mandrel from rotating.

The end, close to the pushing cylinder 1, of the releasing mandrel 2 is provided with a plurality of radial overflow holes 21 communicated with a central flow passage 22 along the circumferential direction; specifically, the number of the radial overflow holes 21 may be set to 2 to 4, and the radial overflow holes 21 may be uniformly arranged along the circumferential direction of the releasing mandrel 2.

Referring to fig. 11, the push cylinder 1 is in a thin-walled cylinder shape, the lower end face is abutted against the large end step face of the conical surface body 3, and an annular space is kept to be matched between the inner hole of the push cylinder 1 and the outer diameter of the step face of the conical surface body 3, wherein the annular space is usually not less than 0.5mm; the upper end (the end far away from the conical surface body 3) of the push cylinder 1 is provided with an internal thread which can be connected with a standard setting tool when the bridge plug is put down in the well, and is used for transmitting the axial load of the setting tool and acting on the conical surface body 3. The number of the through holes arranged on the circumference of the push cylinder 1 can be set to be 2-4, the through holes are used for circulating well bottom fluid, the fluid can sequentially flow through the radial overflow holes 21 and the central flow passage 22 at the upper end of the releasing mandrel 2 from the through holes on the outer circle of the push cylinder 1, so that pressure is relieved under complex working conditions such as upwarp well-band displacement setting, and the like, the situation that the bridge plug is difficult to form a seal with the sleeve 13 due to overlarge pressure during bridge plug setting is avoided, and the bridge plug setting reliability is improved.

The specific manner in which the various modules perform the operations in relation to the dual slip soluble bridge plug system of the above embodiments has been described in detail in relation to the dual slip soluble bridge plug embodiments and will not be described in detail herein.

It should be understood that the specific order or hierarchy of steps in the processes disclosed are examples of exemplary approaches. Based on design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus the following claims are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate preferred embodiment of this invention.

The foregoing description includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, as used in the specification or claims, the term "comprising" is intended to be inclusive in a manner similar to the term "comprising," as interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A rubber ring sealed dissolvable bridge plug comprising: the conical surface body, the sealing component, the anchoring block and the lower joint;

2. The elastomeric ring seal dissolvable bridge plug of claim 1, wherein the maximum width of said elastomeric ring body is from 10mm to 30mm;

3. The elastomeric ring seal soluble bridge plug of claim 2, wherein the maximum outer diameter of said sealing boss is less than 0.2-1mm of the maximum outer diameter of said lower adapter.

4. The elastomeric ring seal soluble bridge plug of claim 3 wherein the maximum width of the seal groove is 1/2 to 3/5 of the maximum width of the elastomeric ring body;

5. The elastomeric ring seal soluble bridge plug of claim 1, wherein said soluble elastomeric material is a soluble polymeric material.

6. The elastomeric seal soluble bridge plug of claim 1, wherein the soluble metal of the spacing clip is a soluble metal having an elongation of 20% to 30%, one end of the spacing clip being provided with a stepped hole for mating with an annular groove of an anchor block to connect the spacing clip to the anchor block;

the maximum width of the annular groove is 1/5-1/3 of the maximum width of the limit hoop, and the depth of the annular groove is not less than 1/2 of the maximum width of the annular groove.

7. The rubber ring sealed soluble bridge plug of claim 1, wherein one end of the cone is provided with a cone hole;

8. The elastomeric ring seal soluble bridge plug of claim 7, wherein the blind hole has a diameter of 8-16mm and a depth of 15-20mm, and wherein the bottom of the blind hole is at a radial distance of no less than 5mm from the inner wall of the cone.

9. The elastomeric ring seal soluble bridge plug of claim 7, wherein the radial distance of the bottom of the flow channel from the first conical surface of the conical body is not less than 8mm.

10. The rubber ring sealed soluble bridge plug of claim 1, wherein a guiding groove is arranged on the end face of the anchoring block, and correspondingly, a guiding boss matched with the guiding groove is arranged on the lower joint so as to limit the anchoring block in the circumferential direction;

11. A rubber-annular sealed soluble bridge plug according to any of claims 1 to 10, wherein the internal bore of the lower sub is provided with a release thread to connect with a release mandrel by means of the release thread;

12. The elastomeric ring seal soluble bridge plug of claim 7, further comprising: the sealing ball is used for sealing the conical hole of the conical surface body;

13. A rubber ring sealed dissolvable bridge plug system, comprising: releasing the mandrel, pushing the cartridge and the rubber ring sealed dissolvable bridge plug of any one of claims 1-11;

the pushing cylinder is abutted with the step of the conical surface body.

14. The elastomeric ring seal soluble bridge plug system of claim 13, wherein the release mandrel is provided with a central flow passage, and wherein one end of the release mandrel adjacent to the push barrel is provided with a plurality of radial overflow holes in the circumferential direction in communication with the central flow passage;

The circumference of the pushing cylinder is provided with a plurality of through holes so that well bottom fluid flows through the through holes and flows into the central flow passage through the radial holes and then flows out.