CN113944439A - Plugging body, underground plugging system and plugging method - Google Patents

Abstract

The invention relates to a plugging body, an underground plugging system and a plugging method. The utility model provides a plugging body, includes the shutoff section, is equipped with the support section on the shutoff section, and the hollow structure of support section for having a blind end supports the outer wall of section and is the conical surface, and the blind end is located the tip of the centrum that the conical surface formed, supports the inner wall of the outer wall adaptation ball seat of section. By adopting the plugging body, the supporting section of the plugging body is of a hollow structure, so that the time for forming a full-bore shaft can be reduced, the delay of the production time of an oil well is avoided, and a channel meeting the production requirement can be provided for the oil-gas well earlier. Compared with the fracturing ball in the prior art, the plugging body can enter the inner channel of the ball seat to be plugged, surface plugging is achieved, the plugging effect is better, the plugging body can support the ball seat from the inner wall of the ball seat and plug the inner channel of the ball seat, the bearing capacity of the ball seat in a well can be improved, and the plugging effect of the plugging body on the ball seat is improved.

Description

Plugging body, underground plugging system and plugging method

Technical Field

The invention relates to the technical field of downhole tools in the petroleum and gas industry, in particular to a plugging body, a downhole plugging system and a plugging method.

Background

The prior art downhole plugging systems include fracturing balls (soluble metal, polymeric or insoluble composite and engineering plastic balls) and ball seats, or fracturing balls and bridge plugs. The bridge plug and the ball seat are widely applied to well bore packing for fracturing modification and acidification of oil and gas wells. In the construction of fracturing reconstruction, it is a common practice to set a ball seat or a bridge plug at a designated position of a downhole sleeve by a cable or a hydraulic setting tool, then pump a fracturing ball to plug an internal passage of the ball seat or the bridge plug set in the well, perforate the inside of the sleeve above the setting position, and perform fracturing reconstruction after the setting tool is lifted out. After the above operations are completed, a full bore wellbore needs to be formed: if the ball seat or the bridge plug is of a soluble structure and the fracturing ball is of a soluble structure, the fracturing ball can be dissolved by itself until the sleeve forms a full path to meet the requirements of flowback and production; if the ball seat or the bridge plug in the well is of an insoluble structure or the fracturing ball is of an insoluble structure, the ball seat or (and) the fracturing ball needs to be drilled and ground, and residues after drilling and grinding are circularly discharged out of the well to form a shaft with a full drift diameter.

The existing bridge plug is provided with an upper slip anchoring mechanism, a lower slip anchoring mechanism and a sealing rubber cylinder, and the structure is complex. Existing ball seats typically have a cone, seals (e.g., rubber cartridges, packing rings, etc.), slips, and a lower sub. The existing tee is shown in figure 1: the sealing ring comprises a cone 1, a sealing ring 2, a slip 3 and a lower joint 4, wherein the outer wall of the cone 1 is a conical surface, and a channel which is axially arranged is arranged in the cone 1; the sealing ring 2 and the slips 3 are sequentially sleeved on the cone 1 from left to right; the left end of the slip 3 is abutted against the right end of the sealing ring 2; the left end of the lower joint 4 is abutted against the right end of the slip 3. The existing fracturing ball is shown in fig. 2: the fracturing ball comprises a fracturing ball body 9, wherein the fracturing ball body 9 is spherical and is used for plugging an opening at one end of the ball seat with the large inner diameter of the cone 1 in a matching manner.

Use the above-mentioned downhole plugging system: the ball seat is firstly set in an underground sleeve, then the fracturing ball is put into the sleeve, and the plugging section 9 of the fracturing ball is plugged at the opening at the end with the large inner diameter of the cone 1, so that plugging is realized. However, in specific construction, the existing underground plugging system is found to have the following defects:

1. the fracturing ball in the prior art is thrown at the opening at the end with the large inner diameter of the cone 1, and can only block the opening of the internal channel of the ball seat to form line blocking, namely the fracturing ball is contacted with the inner wall of the cone 1 to form a line, and the whole channel is not blocked, so that the blocking effect is poor. The existing fracturing ball body 9 is of a solid structure, needs a large amount of dissolution time or a large amount of drilling and grinding and cleaning time after drilling and grinding, leads to overlong time for forming a full-bore shaft, and is easy to delay the production time of an oil well.

2. The ball seat of the existing underground plugging system has more structural members, so that the processing is more complicated; when the underground plugging system is used for plugging, more components are left underground, the whole length is longer, the components are not convenient to dissolve underground or clear from the well, so that more underground residues are left, and an underground sleeve is easy to plug; the influence of the dissolution rate of the ball seat easily influences the construction of an oil well, and delays the production time of the oil well; except that, all need certain thickness because of cone 1, sealing ring 2 and slips 3, cause the inside passageway size of ball seat less, be unfavorable for liquid flowback in the well, cause fracturing fluid or impurity flowback inefficiency in the well, and then influence the output increasing effect of oil.

Disclosure of Invention

The invention aims to: the plugging body is provided aiming at the problems that in the prior art, a fracturing ball can only plug an opening of an internal channel of a ball seat to form a line plugging, the plugging effect is poor, and the prior fracturing ball is of a solid structure and needs a large amount of dissolution time or a large amount of drilling and grinding and cleaning time after drilling and grinding, so that a full-bore shaft is formed too long, and the production time of an oil well is easily delayed.

When used, downhole plugging systems for the prior art exist: the underground components are more, the whole length is longer, the underground dissolution or the cleaning from the well is not convenient, so that more underground residues are generated, and the underground sleeve is easy to block; the influence of the dissolution rate of the ball seat easily influences the construction of an oil well, delays the production time of the oil well and increases the cost; besides, the channel inside the ball seat is small in size, so that the backflow of liquid in the well is not facilitated, the backflow efficiency of fracturing fluid or impurities in the well is low, and the yield increasing effect of oil is further influenced; and the plugging effect of the internal channel of the fracturing ball seat of the fracturing ball is not good, and the fracturing ball is difficult to remove in the process of forming the full-bore shaft, so that the underground plugging system and the plugging method are provided.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a plugging body, includes the shutoff section, be equipped with the support section on the shutoff section, the hollow structure of support section for having a blind end, the outer wall of support section is the conical surface, the blind end is located the tip of the centrum that the conical surface formed, the inner wall of the outer wall adaptation ball seat of support section.

The plugging section comprises a supporting section which is of a hollow structure, wherein the plugging body can adopt the following structure: the component is soluble, and the hollow structure is communicated with the outside. The structure can increase the contact area of the plugging body and well fluid in the sleeve and improve the dissolution rate of the plugging body. At the moment, only one end of the supporting section can be communicated with the outside, and the other end of the supporting section needs to be in a closed state and is used for fracturing the ball seat. The plugging body can also adopt: the member is soluble and the hollow structure is a closed space. The interior of the hollow structure in such a structure may be used for placement of sensors or chemicals. Such as a well with a chemical agent, to help speed the dissolution of the block. Or the dissolution time of the plugging body is controlled by the carried chemical agent, so that a full-drift-diameter shaft is convenient to form. The temperature sensor can be carried to go into the well together, the actual temperature of the plugging position of the ball seat can be collected, and the dissolution time of the position of the plugging body in the well can be estimated conveniently. The plugging body can also adopt: an insoluble member. The structure can reduce the drilling and grinding volume of the plugging body and reduce the drilling and grinding difficulty of the plugging body. Further reducing the drilling and grinding time of the plugging body and the time for clearing after drilling and grinding. By adopting the plugging body, the time for forming the full-drift-diameter shaft can be reduced. Meanwhile, the delay of the production time of the oil well is avoided, and a channel meeting production requirements can be provided for the oil and gas well earlier. Moreover, compared with the fracturing ball in the prior art, the plugging body can enter the inner channel of the ball seat for plugging, so that surface plugging is realized, and the plugging effect is better. And the blocking body can support the ball seat from the inner wall of the ball seat and block the inner passage of the ball seat. Therefore, the bearing capacity of the ball seat in the well is improved, and the plugging effect of the plugging body on the ball seat is improved.

Preferably, the plugging section further comprises a guide section connected with the closed end of the support section, the outer wall of the guide section is a conical surface, and the axial gradient of the outer wall of the guide section is greater than the axial gradient of the outer wall of the support section.

The guide section is connected to the smaller one end of shutoff body external diameter, the guide section plays the guide effect. The blocking body is used for assisting in guiding the blocking body, so that the supporting section with the cavity structure inside can more easily enter the ball seat for blocking. The guide section is solid construction, and its volume ratio the volume of support section is littleer, can with the focus of the shutoff body is gathered at the guide section of the shutoff body. The outer wall of the guide section is a conical surface, so that medium resistance can be better resisted, the plugging body can be guided and inserted into the ball seat conveniently, and the plugging body can better plug the ball seat.

Preferably, one end of the supporting section, which is far away from the closed end, is provided with a straight cylinder section, the straight cylinder section and the plugging section are integrated components, and an internal cavity of the straight cylinder section is communicated with an internal cavity of the supporting section.

The straight cylinder section is used for limiting the direction of the plugging body in the process of entering the sleeve and plugging the ball seat, so that the phenomena of overturning, shifting and the like of the plugging body in the underground sleeve are avoided, the plugging safety of the plugging body is improved, and the failure of plugging the ball seat by the plugging body is avoided; and the inner cavity of the straight cylinder section is communicated with the inner cavity of the supporting section, so that the storage space of the plugging body carrying the medicine or the sensor can be increased. And the straight cylinder section with the shutoff section formula component as an organic whole, promptly the shutoff body formula component as an organic whole makes the wholeness of the shutoff body is better, and can improve the bearing capacity of the shutoff body, is convenient for the shutoff body blocks up the ball seat in the sleeve in the pit, improves the shutoff body is right the shutoff quality that the ball seat blocked up.

Preferably, the outer wall of the support section is provided with at least one groove arranged along the circumferential direction, and a sealing ring or a sealing belt is arranged in the groove in a matching manner.

Through setting up at least one edge the recess that the support section outer wall circumference set up, can with the adaptation in the sealing strip or the sealing washer of recess are installed in the recess, and then when the inner passage of shutoff body shutoff ball seat, sealing strip or sealing washer can assist the sealing the ball seat, reinforcing the shutoff effect of shutoff body to the ball seat.

A downhole plugging system comprising a cartridge and a plugging body as described in any of the above;

the clamping seat comprises an integrated section hoop, the integrated section hoop can form sealing with the inner wall of the underground sleeve and is anchored on the inner wall of the underground sleeve, a channel is axially arranged on the integrated section hoop, and the shape and the size of the inner wall of the integrated section hoop are respectively matched with the shape and the size of the outer wall of the supporting section.

The function of the holder is the same as that of the ball holder of the prior art, and the structure of the holder is similar to that of the existing ball holder. The integral joint hoop has a sealing function and an anchoring function, can form sealing with the inner wall of the underground sleeve, and can be anchored on the inner wall of the underground sleeve. The inner wall of the joint hoop is a conical surface, which means that the inner diameter of the joint hoop gradually decreases from one end of the joint hoop far away from the lower joint to the other end. This configuration facilitates the support and sealing of the sealing segment from within the integral joint band, such as: the integral joint band includes a plastically deformable member. The plastic deformation member means that it can maintain its shape without springing back after being subjected to expansion deformation by force. The inner wall of the plastic deformation component is a conical surface, and slip teeth are arranged on the outer wall of the plastic deformation component. The two ends of the plastic deformation component are extruded by the setting tool matched with the lower joint of the clamping seat, and a conical component which can extend into the plastic deformation component for supporting is arranged on the setting tool. The conical member causes the plastically deformable member to expand and deform radially outwardly to effect a seal. Meanwhile, the slip teeth anchor the integrated section hoops on the inner wall of the sleeve to realize setting. The clamping seat can still be set on the inner wall of the sleeve by removing a cone structure of a ball seat in the prior art and adopting an integrated section hoop with an anchoring function and a sealing function. Meanwhile, the integrated section hoop can be matched with a plugging body to realize the plugging function of the underground plugging system. The plugging body can reduce the time for forming the full-bore shaft, avoid delaying the production time of an oil well, and provide a channel for meeting production for the oil-gas well earlier. Compared with the fracturing ball in the prior art, the plugging body can enter the inner part of the inner channel of the integrated joint hoop for plugging, so that surface plugging is realized, and the plugging effect is better. And the plugging body can support the integrated section hoop from the inner wall of the integrated section hoop and plug the inner channel of the integrated section hoop. The plugging body can improve the pressure bearing capacity of the integrated section hoop in the well, and improve the plugging effect of the integrated section hoop. And the structure of the clamping seat is less, namely the structure of the plugging system is less, and the processing is convenient. Because the plugging system has fewer structures, the plugging system can be operated to plug the sleeve more conveniently during plugging, and the safety and the reliability are higher. After the plugging is completed, the structure left in the underground sleeve is less, so that a full-drift-diameter shaft is convenient to form, and a channel meeting the production requirement is provided for the oil-gas well earlier. Because the material of the clamping seat is not limited, when the soluble clamping seat is adopted, the plugging system can be dissolved conveniently, and the dissolving time of the underground plugging system can be shortened. When the insoluble clamping seat is adopted, the plugging system can be conveniently removed from the well after drilling and grinding. Further, delay of the production time of the oil well is avoided, construction cost is saved, residues in the well can be reduced, and blockage of the sleeve is avoided. Under the condition that the inner diameter of the underground sleeve is fixed, the wall thickness of the clamping seat is thinner because a cone structure is removed, so that the size of an internal channel of the clamping seat is larger, well fluid can flow conveniently, and the well fluid is favorable for flowing back. The method has the advantages of high impurity flowback efficiency of fracturing fluid or well, and further improvement of yield increase effect of oil and gas. Simultaneously, the plugging section of the plugging body can be thickened, the plugging body is improved, and the integrated joint hoop supporting capacity is improved.

Preferably, the integral type section hoop includes sealing ring and slips, the slips includes slip seat and a plurality of slips tooth, the slip seat with the sealing ring is the plastic deformation component, the slip seat with sealing ring formula component as an organic whole, slip seat one end is equipped with sealing ring, the other end are equipped with the lower clutch.

The slip teeth are arranged in slip tooth grooves in the outer wall of the slip seat.

The integral joint band includes slips and a sealing ring that includes the sealing and anchoring functions of existing ball seats. The sealing ring and the slip seat of the slip are both plastic deformation components, which means that the sealing ring and the slip seat can keep shapes and do not rebound after being subjected to stress expansion deformation, and the integral joint hoop can be ensured to be stably sealed with the inner wall of the sleeve. Because of slip seat and sealing ring formula component as an organic whole just be plastic deformation's component, along with two terminal surfaces of integral type section hoop receive the relative effort extrusion, the sealing ring with the slip seat all can receive extrusion expansion deformation. The outer wall of the sealing ring can be attached to the inner wall of the underground sleeve, and the sealing function of the integrated joint hoop is achieved. And meanwhile, the integrated joint hoop is anchored on the inner wall of the underground sleeve by the slip teeth of the slip to finish setting. The clamping seat removes the cone structure of the existing ball seat, and simultaneously forms the slip and the sealing ring into an integral joint hoop, namely, two components of the integral joint hoop and a lower joint are reserved. When setting, a setting mechanism is needed to limit the expansion direction of the integrated joint hoop so that the integrated joint hoop expands and deforms outwards along the radial direction. Such as: and a supporting structure on the setting tool is adopted to support the inside of the integrated section hoop. The lower connector is separated from the integrated joint hoop after setting, and then the plugging body plugs the internal channel of the integrated joint hoop. After plugging is completed, an integrated joint hoop, a plugging body and a lower joint separated from the plugging body are left in the well, so that fewer structural members are left in the well.

Preferably, one end of the slip seat, which is provided with the lower joint, is provided with a plurality of toothed plates, and a gap is formed between every two adjacent toothed plates and is arranged along the axial direction of the slip seat.

The shape and the size of clearance make according to actual design condition for the standard the pinion rack can be opened, the slips tooth anchoring of being convenient for is in sleeve inner wall in the pit, satisfies promptly the anchoring function of integral type festival hoop. The stress capacity of the integrated section hoop should be met, the integrated section hoop is prevented from being damaged, and the sealing function of the integrated section hoop is guaranteed. When the integral type section hoop received the extrusion power at both ends and acted, the pinion rack that slips seat had gapped one end can the atress expand, makes the better anchoring of the slips tooth on the slips seat outer wall at sleeve inner wall in the pit. Simultaneously the slip seat other end terminal surface can be even transmit axial force to the sealing ring, avoid the sealing ring is destroyed.

Preferably, the clearance contains clearance bottom and clearance neck, the clearance bottom is the stress hole, the clearance neck is the bar groove, the stress hole with bar groove intercommunication, the opening setting in bar groove is being close to the one end of lower clutch, the width of clearance neck is less than the width of clearance bottom.

The gap between two adjacent toothed plates comprises a gap bottom part close to the sealing ring and a gap neck part close to the lower joint. The bottom of the gap is provided with the stress hole which is used for avoiding the clamping shoe seat from being damaged due to concentrated stress. The clearance neck is the bar groove, and its opening setting is being close to the one end of lower clutch is convenient for when receiving lower clutch butt force the expansion of pinion rack. And the normal anchoring work of the slips, namely the normal anchoring work of the joint hoops is ensured.

Preferably, all the stress holes are uniformly distributed along the circumferential direction of the slip seat, so that the stress holes can uniformly distribute the stress along the circumferential direction of the slip seat, and the slip seat is prevented from being damaged due to concentrated stress.

Preferably, the stress hole is a kidney-shaped hole, a regular polygon hole, an ellipse or a circular hole. And the stress hole is conveniently processed by adopting a regular shape. Of course, the dimensions of the above shapes are determined according to actual design conditions, and other shapes and structures capable of reducing the stress concentration of the slip bowl can be adopted. When adopting waist shape hole, the one end opening intercommunication in the long limit in waist shape hole and bar groove, promptly the clearance is equivalent to T type groove structure, the opening of the pinion rack of being convenient for, and then satisfies the anchoring ability of integral type festival hoop. And the width of the waist-shaped hole along the axial direction of the integrated section hoop can be adjusted according to the actual stress condition, so that the integral stress of the integrated section hoop is met. Thereby avoiding the integral type section hoop to be destroyed, and then satisfying the sealing ability and the anchoring ability of integral type section hoop.

Preferably, the width of the gap neck is 3-5mm, and the width of the gap bottom is 3-5 times of the width of the gap neck.

The slip seat uses the clearance of above-mentioned design value, and the clearance bottom can be better avoid the slip seat to concentrate because of the atress and destroy, and the pinion rack that the clearance neck can make things convenient for on the slip seat simultaneously expandes, and the slips of being convenient for is anchored in telescopic inner wall in the pit.

Preferably, the blocking body, the slip seat, the sealing ring and the lower joint are all soluble components, the blocking seat and the blocking body are made of the soluble components, and when a full-drift-diameter shaft is formed, the blocking seat and the blocking body do not need to be removed from the shaft, and the blocking seat and the blocking body only need to be dissolved in liquid with corresponding mineralization degree in the shaft. The construction is more convenient, and the formation of the full-drift-diameter shaft refers to the process of dissolving the clamping seat and the plugging body matched with the clamping seat to plug the underground sleeve together or drilling and grinding the clamping seat and the plugging body and removing the clamping seat and the plugging body from the well.

Preferably, the slip seat and the sealing ring are both members with the elongation percentage of 14-40%.

The sealing ring and the slip seat are both made of high-elongation materials or conforming materials, and the high-elongation means that the elongation is between 14% and 40%. Because the invention adopts the high-elongation component, the sealing ring and the slip seat can generate enough deformation, thereby realizing the sealing of the clamping seat.

Preferably, the slip bowl and the sealing ring are both magnesium alloy members or other soluble metals which can reach the elongation percentage range of 14% -40%, and the soluble metals refer to metals which can be dissolved in liquid with corresponding salinity, so that the slip bowl and the sealing ring can be dissolved conveniently.

Preferably, the slip teeth are of a columnar structure, an included angle between the outer end faces of the slip teeth and the axis of the slip seat is 10-60 degrees, and the outer end faces of the slip teeth are back to the end, provided with the toothed plate, of the slip seat.

The outer end face is the face opposite to the groove bottom face of the slip tooth groove on the slip tooth, and the face and the axis of the slip seat form an inclined plane, so that the contact area between the slip tooth and the sleeve is reduced, the capability of the slip tooth to be extruded into the sleeve is enhanced, and the anchoring capability of the soluble integral slip is better.

Preferably, the slip seat comprises 4-12 toothed plates, and the toothed plates are uniformly provided with 2-6 slip tooth grooves.

Preferably, all the slip tooth grooves on each tooth plate are axially arranged along the slip bowl.

The number of the slip teeth can be changed according to the stress and the design requirement. Will the slips tooth socket evenly sets up on the pinion rack, promptly the slips tooth evenly sets up on the pinion rack, works as when the pinion rack atress opens, the better anchoring of slips tooth is gone into in the sleeve, and the anchoring effect of slips is better.

Preferably, the slip teeth are ceramic or ceramic-metal components.

Preferably, the sealing ring is provided with at least one circle of sealing ring or sealing belt, and the sealing ring and the sealing belt are used for auxiliary sealing.

A method of plugging comprising employing a downhole plugging system as described in any of the above;

the plugging method of the underground plugging system comprises the following steps: and (3) extending the plugging section of the plugging body into the set integrated section hoop, so that the outer wall of the plugging section is abutted against the inner wall of the integrated section hoop, and plugging the channel in the integrated section hoop by the plugging section, thereby completing underground plugging.

The underground sleeve is plugged by the plugging method, and the plugging body is operated to enter the inside of the set integrated joint hoop for plugging so as to assist the integrated joint hoop in bearing pressure. The plugging well bed that can be stable improves shutoff construction safety nature, guarantees that fracturing transformation operation construction safety goes on.

Preferably, before the plugging step, a setting step is further included;

the setting step comprises a recyclable expansion cone used for setting a clamping seat of the underground plugging system, the recyclable expansion cone comprises a push cylinder, one end of the push cylinder is connected with a setting cylinder, the outer wall of one end, far away from the push cylinder, of the setting cylinder is used for being matched and abutted against the inner wall of the integrated joint hoop, an adaptive joint and a releasing rod are axially arranged in the push cylinder, one end of the releasing rod is connected with one end of the adaptive joint, and the other end of the releasing rod is used for being connected with the lower joint of the clamping seat;

the setting step comprises the following steps:

the method comprises the following steps: one end of the handle losing rod penetrates through the integrated joint hoop and is detachably connected to the lower joint, and the setting barrel abuts against the inner wall of the integrated joint hoop;

step two: the recyclable expansion cone and the clamping seat are conveyed to a designated setting position in the sleeve together;

step three: applying an acting force to the adapter joint out of the well, and simultaneously applying an acting force to the setting barrel in the well by using the pushing barrel, so that the integrated joint hoop moves along the outer wall of the setting barrel, the integrated joint hoop is deformed until the outer wall of the integrated joint hoop contacts the inner wall of the sleeve, and the integrated joint hoop is anchored on the inner wall of the sleeve until the lower joint is separated from the releasing rod and the lower joint is separated from the integrated joint hoop;

step four: and recovering the recoverable expansion cone, and finishing the setting construction.

The underground sleeve is plugged by the plugging method. Through the operation but recovery type expansion cone is set and is sealed the cassette, but recovery type expansion cone's a setting section of thick bamboo can support the integral type festival hoop from integral type festival hoop inside, and the bulging deformation who ties the integral type festival carries on spacingly, makes the integral type festival hoop radially outwards bulging deformation. Can be stable will integral type festival hoop is set and is sealed in telescopic assigned position department in the pit, guarantees that later stage shutoff body can be safe carry out the shutoff to integral type festival hoop.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. by adopting the plugging body, the supporting section of the plugging body is of a hollow structure, so that the time for forming a full-bore shaft can be reduced, the delay of the production time of an oil well is avoided, and a channel meeting the production requirement can be provided for the oil and gas well earlier. Compared with the fracturing ball in the prior art, the plugging body can enter the inner channel of the ball seat for plugging, so that surface plugging is realized, and the plugging effect is better. And the plugging body can support the ball seat from the inner wall of the ball seat and plug the internal channel of the ball seat, so that the bearing capacity of the ball seat in the well can be improved, and the plugging effect of the plugging body on the ball seat can be improved. And the guide section of the plugging body is conical, and the guide section is of a solid structure, and the volume of the guide section is smaller than that of the supporting section. The gravity center of the plugging body is gathered at the guide section of the plugging body, the conical guide section can better resist medium resistance, the plugging body is convenient to guide and insert into the internal channel of the ball seat, and the plugging body can better plug the ball seat.

2. By adopting the underground plugging system, the lower joint is reserved and the integrated joint hoop with the anchoring function and the sealing function is adopted after the cone of the ball seat in the prior art is removed from the clamping seat, so that the clamping seat can still be seated on the inner wall of the sleeve. Meanwhile, the integral joint hoop can be matched with a plugging body to realize the plugging function of the underground plugging system. And the structure of the clamping seat is less, namely the structure of the plugging system is less, and the processing is convenient. Because the plugging system has fewer structures, the plugging system can be operated to plug the sleeve more conveniently during plugging, and the safety and the reliability are higher. After the plugging is completed, the structure left in the underground sleeve is less, so that a full-drift-diameter shaft is convenient to form, and a channel meeting the production requirement is provided for the oil-gas well earlier. Because the material of the clamping seat is not limited, if a soluble clamping seat is adopted, the plugging system is convenient to dissolve, and the dissolving time of the underground plugging system can be reduced. When the insoluble clamping seat is adopted, the plugging system can be conveniently removed from the well after drilling and grinding. Further avoiding delaying the production time of the oil well and saving the construction cost. And can reduce the residue in the pit, avoid the sleeve to block up. Under the condition that the inner diameter of the underground sleeve is fixed, the wall thickness of the clamping seat is thinner and the size of the internal channel of the clamping seat is larger due to the fact that the cone structure is removed. The well fluid is convenient to flow, the well fluid is favorable for flowback, and the efficiency of flowback of the impurities in the fracturing fluid or the well is high. Simultaneously, the plugging section of the plugging body can be thickened, the plugging body is improved, and the integrated joint hoop supporting capacity is improved.

3. The integrated joint hoop is an integral structure of a slip and a sealing ring. The sealing ring and the slip seat of the slip are both plastic deformation members, and the sealing ring and the slip seat are integrated members, so that the sealing ring and the slip seat can synchronously expand and deform and can not rebound. And then can realize the sealed function and the anchoring function of cassette, be convenient for sit and seal the cassette. And the sealing ring and the slips are integrally formed, so that the structure of the clamping seat is simpler, and the processing is more convenient.

4. According to the plugging method, the recoverable expansion cone is used for setting and sealing the clamping seat. The seat of recoverable formula inflation awl is sealed a section of thick bamboo and can be followed the integral type and economize the hoop inside and support, and the bulging deformation who economizes the hoop to the integral type carries on spacingly. Make the radial outward bulging deformation of integral type festival hoop, can be stable with the integral type festival hoop is set and is sealed at telescopic assigned position department in the pit, guarantees that later stage shutoff body can be safe carry out the shutoff to integral type festival hoop. The integral type festival that gets into through the operation shutoff body seals by seat is inside to be carried out the shutoff, assists the integral type festival hoop pressure-bearing, and shutoff well bed that can be stable improves shutoff construction security, guarantees that fracturing transformation operation construction safety goes on.

Drawings

FIG. 1 is a schematic view of a ball holder according to the prior art;

fig. 2 is a schematic structural view of a fracturing ball in the prior art.

FIGS. 1-2 illustrate: 1-cone; 2-a sealing ring; 3-slips; 4-lower joint; 9-fracturing the ball body.

FIG. 3 is a front view of the block piece of example 1;

FIG. 4 is a first cross-sectional view A-A of FIG. 3;

FIG. 5 is a second cross-sectional view A-A of FIG. 3;

FIG. 6 is a mating view of the occluding body and the integral node band after occlusion in example 2;

fig. 7 is a cross-sectional view at B-B in fig. 6.

Fig. 8 is a perspective view of the cartridge described in embodiment 2;

fig. 9 is a front view of the cartridge described in embodiment 2;

FIG. 10 is a cross-sectional view taken at C-C of FIG. 9;

FIG. 11 is a schematic structural view of a recoverable expansion cone described in example 3;

fig. 12 is a cross-sectional view taken at D-D in fig. 11.

FIGS. 3-12 illustrate: 2-a sealing ring; 21-sealing tape; 23-a one-piece joint hoop; 3-slips; 31-a slip bowl; 311-toothed plate; 32-slip teeth; 33-clearance; 331-bottom of gap; 332-gap neck; 4-lower joint; 5-a push cylinder; 6-fitting a joint; 7-throwing the hand lever; 8-setting the cylinder; 9-plugging section; 91-a support section; 911-groove; 92-a guide section; 10-straight cylinder section; 101-end cap.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

The embodiment provides a plugging body, referring to fig. 3 to 5, which includes a plugging section 9, a supporting section 91 is disposed on the plugging section 9, the supporting section 91 is a hollow structure having a closed end, an outer wall of the supporting section 91 is a conical surface, the closed end is located at a small end of a cone formed by the conical surface, and the outer wall of the supporting section 91 is adapted to an inner wall of the ball seat.

The plugging body is used for fracturing the internal channel of the ball seat, and can adopt a soluble component or an insoluble component. When a soluble member is used, the plug needs to be dissolved when forming a full bore wellbore. When the insoluble component is adopted, the plugging body needs to be drilled and ground when the full-bore shaft is formed, so that the plugging body is drilled and ground into slag, and the slag is removed from the shaft through the backflow of well fluid. By adopting the plugging body, the supporting section 91 of the plugging body is of a hollow structure, so that the time for forming a full-bore shaft can be reduced, the delay of the production time of an oil well is avoided, and a channel meeting the production requirement can be provided for the oil and gas well earlier. And the shutoff body looks like the fracturing ball of prior art, and its inside that can get into the internal passage of ball seat carries out the shutoff, and the outer wall through support section 91 is the conical surface and the conical surface inner wall adaptation of ball seat, has realized face shutoff, and the shutoff effect is better. And after plugging, well fluid enters the hollow structure of the plugging body, the plugging body can support the ball seat from the inner wall of the ball seat and plug the internal channel of the ball seat, the pressure bearing capacity of the ball seat in the well can be improved, and the plugging effect of the plugging body on the ball seat is improved.

This example illustrates a soluble block. See, in particular, FIGS. 3-5. The blocking body comprises a right blocking section 9 and a left straight cylindrical section 10. The straight cylinder section 10 is used for limiting the trend of the plugging body in the process of entering the sleeve and plugging the ball seat, avoiding the phenomena of overturning, shifting and the like of the plugging body in the sleeve in the pit, improving the plugging safety of the plugging body and avoiding the failure of the plugging body in plugging the ball seat. In this embodiment, the plugging section 9 and the left straight section 10 are larger than the inner diameter of the casing to be plugged. For example, in a downhole casing with a casing diameter of 127 mm, the total length of the plugging section 9 and the left straight section 10 is set to 140 mm, ensuring that the plugging body does not turn over and shift inside the casing. The plugging section 9 comprises a supporting section 91 and a guiding section 92 connected to the right end of the supporting section 91, the straight cylinder section 10 is arranged at one end of the guiding section 92 far away from the plugging section 9, the guiding section 92 is of a solid structure, and the supporting section 91 is of a hollow structure. That is, the inside of the supporting section 91 has a cavity, and the internal cavity of the straight cylinder section 10 is communicated with the internal cavity of the supporting section 91, so that the storage space of the blocking body carrying the medicine or the sensor can be increased. The internal cavity of the straight cylinder section 10 may or may not be closed after communicating with the internal cavity of the support section 91. When closed, as shown in fig. 5, an end cover 101 is used to block the opening at the left end of the straight cylinder section 10. The end cap 101 may be used to block the opening at the left end of the supporting section 91, so as to close only the inner cavity of the supporting section 91, which is not shown in the figure. The closed cavity may be used for storing a container for placing sensors or chemicals, such as: the closed cavity carries chemical agents to go down the well together, which is helpful for accelerating the dissolution of the plugging system in the well or controlling the dissolution time of the plugging body, wherein the chemical agents comprise solid acidic chemicals such as citric acid, oxalic acid or sulfamic acid. Or the plugging body is carried with a temperature sensor to be put into the well, so that the actual temperature of the plugging position of the ball seat can be collected, and the dissolution time of the plugging body at the position in the well can be estimated conveniently. When the cavity of the supporting section 91 is not closed after being communicated with the cavity of the straight cylinder section 10, as shown in fig. 4, the area of the plugging body contacting well fluid can be increased, and the dissolution rate of the plugging body is increased. Meanwhile, well fluid enters the hollow structure of the plugging body, the plugging body can support the ball seat from the inner wall of the ball seat and plug the internal channel of the ball seat, the pressure bearing capacity of the ball seat in the well can be improved, and the plugging effect of the plugging body on the ball seat is improved.

The outer wall of the support section 91 is tapered as shown in fig. 3. Indicate its external diameter along the axial from a left side to a right side and reduce gradually, the outer wall adaptation butt of the support section 91 of being convenient for in the inner wall of ball seat makes the shutoff body can support the inner passage of ball seat and shutoff ball seat from the inner wall of ball seat, can improve the bearing capacity of ball seat in the well to improve the shutoff effect of shutoff body to the ball seat. And the outer wall of support section 91 is equipped with at least one recess 911 along the circumference setting, and the inside recess 911 is used for the adaptation to set up sealing washer or sealing band 21. In the embodiment, taking the sealing strip 21 as an example, two grooves 911 are formed in the outer wall of the support section 91, and one sealing strip 21 is disposed in each groove 911, as shown in fig. 7, the sealing strip 21 plays a role in assisting sealing. The outer wall of the guide section 92 is a conical surface, the plugging section of the support section 91 is connected with the guide section 92, and the gradient of the outer wall of the guide section 92 along the axial direction is greater than or equal to the gradient of the outer wall of the support section 91 along the axial direction. The guide section 92 is of a solid structure and can gather the center of gravity of the plugging body on the central axis of the plugging body. The gravity center of the plugging body is gathered at the guide section 92 of the plugging body, and the conical guide section 92 can better resist medium resistance, so that the plugging body can be guided and inserted into the ball seat conveniently. In a preferred embodiment, the straight tube section 10 and the plugging section 9 are an integral member, that is, the plugging body is an integral member, in this embodiment, the plugging body is an integrally formed member. The integrated forming member enables the integrity of the plugging body to be better, the strength is higher, the bearing capacity of the plugging body can be improved, the plugging body can conveniently plug the ball seat in the underground sleeve, and the plugging quality of the underground plugging system is improved.

Example 2

The present embodiment provides a downhole plugging system, see fig. 3-10, comprising a cartridge and a plugging body as in embodiment 1;

the cassette includes that integral type festival hoop 23, integral type festival hoop 23 can form sealed and anchoring in sleeve inner wall in the pit with sleeve inner wall in the pit, and integral type festival hoop 23 is equipped with the passageway along the axial, and the shape and the size of integral type festival hoop 23 inner wall adapt to respectively in the shape and the size of support section 91 outer wall.

Wherein the integral joint hoop 23 has a sealing function and an anchoring function, and can form a seal with the inner wall of the downhole sleeve and can be anchored on the inner wall of the downhole sleeve. The inner wall of the integral joint hoop is a conical surface, which means that the inner diameter of the integral joint hoop is gradually reduced from one end of the integral joint hoop 23 far away from the lower joint 4 to the other end, so that the plugging section 9 can be conveniently supported and plugged from the inside of the integral joint hoop 23. The integral joint band 23 is a plastically deformable member. The plastic deformation component can keep the shape without springback after being subjected to stress expansion deformation, the inner wall of the plastic deformation component is a conical surface, the outer wall of the plastic deformation component is provided with slip teeth 32, and the two ends of the plastic deformation component are extruded by matching the setting tool with the lower joint 4 of the clamping seat. The setting tool is provided with a conical member which can extend into the plastic deformation member for supporting, and the plastic deformation member can be limited to expand and deform outwards along the radial direction, so that sealing is realized. And meanwhile, the slip teeth 32 anchor the integrated joint hoop 23 on the inner wall of the sleeve to realize setting. Wherein the setting tool can adopt a recoverable expansion cone as shown in figures 11-12.

In this embodiment, referring to fig. 8-10, the integral joint hoop 23 includes a sealing ring 2 and a slip 3, the slip 3 includes a slip seat 31 and a plurality of slip teeth 32, wherein the slip teeth 32 are disposed in grooves of the slip teeth 32 on the outer wall of the slip seat 31, both the slip seat 31 and the sealing ring 2 are plastic deformation members, the slip seat 31 and the sealing ring 2 are integral members, and in this embodiment, the integral members are formed by integral molding. The slip bowl 31 is located between the sealing ring 2 and the lower joint 4. Specifically, the lower joint 4 is also provided with an internal channel along the axial direction, and the internal channel of the lower joint 4 is communicated with the internal channel of the integrated joint hoop 23. The left end of the lower joint 4 is provided with a protrusion which can be snapped into the internal channel of the integral joint hoop 23. The left end surface of the lower joint 4 is in contact with the right end surface of the slip seat 31 in a fitting manner. The plastic deformation component can keep the shape without springback after expansion deformation, and ensures that the integrated joint hoop 23 can keep stable sealing with the inner wall of the sleeve. Along with two terminal surfaces of integral type festival hoop 23 receive relative action extrusion, sealing ring 2 and slip seat 31 all can receive extrusion expansion deformation, make the outer wall of sealing ring 2 can paste tight sleeve inner wall in the pit, realize integral type festival hoop 23's sealed function. And meanwhile, the slip teeth 32 of the slips 3 anchor the integrated joint hoop 23 on the inner wall of the underground sleeve to finish setting. In a preferred embodiment, at least one ring of sealing ring or sealing tape 21 is provided on the sealing ring 2, and both the sealing ring and the sealing tape 21 are used for auxiliary sealing, and in this embodiment, the sealing tape 21 is taken as an illustration.

Wherein, the lower joint 4, the sealing ring 2, the slip seat 31 and the plugging body can all adopt soluble materials. Alternatively, the lower joint 4, the sealing ring 2, the slip bowl 31 and the blocking body are all made of an insoluble material or an insoluble composite material. In the process of forming the full-bore shaft after the clamping seat is set and then is blocked by the blocking body: when the cartridge and the blocking body are both made of soluble materials, the cartridge has a shorter dissolution time and less residue because the structural members of the cartridge are less compared to those of the ball seats of the prior art. When the cassette adopts insoluble material or insoluble combined material to make, the cassette need be bored and worn away, and the structure that because of the cassette compares in prior art ball seat structure still less, the cassette bores and grinds the time faster, and salvages or the reverse drainage time is shorter in following the well, is convenient for clear away in the well.

Specifically, the present embodiment exemplifies a soluble cartridge and a soluble block. In this embodiment, the lower joint 4 and the plugging body of the card seat are both made of soluble metal. Such as: the aluminum alloy or the magnesium alloy is adopted, and can be metal which can be dissolved in liquid with corresponding degree of mineralization, and can also be other soluble non-metallic materials. Wherein, the seal ring 2 and the slip seat 31 are both members with the elongation percentage between 14 percent and 40 percent. The material comprises a metal component, a nonmetal component or a composite component, and can meet the plastic deformation of the sealing ring 2 and the slip seat 31, and ensure that the sealing ring 2 does not rebound after deformation. And ensures that the slips 3 are able to anchor the seal ring 2 in a given position. Such as a member made of a high elongation metal. In this embodiment, the slip bowl 31 and the seal ring 2 are both plastically deformable magnesium alloy members or other soluble metals that can achieve an elongation in the range of 14% to 40%. Soluble metal means a metal that is soluble in a liquid of the corresponding degree of mineralization.

Specifically, as shown in fig. 6 to 10, the right end of the slip bowl 31 has 8 tooth plates 311, each tooth plate 311 is provided with 3 slip tooth grooves, all slip tooth grooves on each tooth plate 311 are axially arranged along the slip bowl 31, the three slip tooth grooves are arranged in a triangular shape, and one slip tooth 32 is arranged inside each slip tooth groove. The slip teeth 32 are of a columnar structure, and the included angle between the outer end faces of the slip teeth 32 and the axis of the slip seat 31 is 10-60 degrees. The outer end face of the slip teeth 32 faces away from the end of the slip bowl 31 where the toothed plate 311 is located. The outer end surface is the surface of the slip tooth 32 opposite the groove bottom surface of the slip spline. The surface has an inclined angle with the axis of the slip bowl 31 to form an inclined surface, which reduces the contact area between the slip teeth 32 and the sleeve, enhances the ability of the slip teeth 32 to squeeze into the sleeve, and makes the anchoring ability of the soluble integral slip 3 better. Of course, the number of slip teeth 32 may vary depending on the force and design requirements. The slip tooth grooves are uniformly formed in the toothed plate 311, namely the slip teeth 32 are uniformly formed in the toothed plate 311, when the toothed plate 311 is stressed to be opened, the slip teeth 32 are anchored into the sleeve well, and the anchoring effect of the slip 3 is good.

A gap 33 is formed between two adjacent tooth plates 311, and the gap 33 is arranged along the axial direction of the slip bowl 31. Specifically, the gap 33 includes a gap bottom 331 and a gap neck 332, and the gap bottom 331 is a stress hole. The stress holes are kidney-shaped holes, regular polygon holes, oval or circular holes. In this embodiment, the stress hole is exemplified by a circular hole, and the gap neck 332 is a strip-shaped groove. The left end opening intercommunication in circular shape stress hole and bar groove, the right-hand member opening setting in bar groove is in the one end that is close to lower clutch 4. The width of the gap neck 332 is less than the width of the gap bottom 331. Specifically, the width of the gap neck 332 is 3-5mm, and the width of the gap bottom 331 is 3-5 times the width of the gap neck 332. The cartridge remains the lower joint 4 and adopts the integral joint hoop 23 with anchoring and sealing functions by removing the conical structure of the ball seat in the prior art, still being able to seat the cartridge on the inner wall of the sleeve. Meanwhile, the integral joint hoop 23 can be matched with a plugging body to realize the plugging function of the underground plugging system, as shown in fig. 6-7, when the plugging body is used for plugging the integral joint hoop 23, the integral joint hoop is the same as the existing ball seat in the plugging embodiment 1. The support section 91 of the plugging body is of a hollow structure, so that the time for forming a full-bore shaft can be reduced, the delay of the production time of an oil well is avoided, and a channel meeting the production requirement can be provided for the oil and gas well earlier. And the shutoff body looks like the fracturing ball of prior art, and its inside that can get into integral type festival hoop 23's inner passage carries out the shutoff, has realized the face shutoff, and the shutoff effect is better. The blocking body can support the integral type festival hoop 23 and the inner channel of shutoff integral type festival hoop 23 from the inner wall of integral type festival hoop 23, can improve the bearing capacity of integral type festival hoop 23 in the well to improve the blocking effect of the blocking body to integral type festival hoop 23.

Compared with the existing underground plugging, the clamping seat structure has fewer parts, namely, the plugging system has fewer structures, and is convenient to process. Meanwhile, the plugging system has fewer structures, so that the plugging system is more convenient to operate to plug the sleeve during plugging, and the safety and the reliability are higher. After the plugging is completed, the structure left in the underground sleeve is less, so that a full-drift-diameter shaft is convenient to form, and a channel meeting the production requirement is provided for the oil-gas well earlier. Because the material of the clamping seat is not limited, if the soluble clamping seat is adopted, the plugging system is convenient to dissolve, and the dissolving time of the underground plugging system can be reduced. When the insoluble clamping seat is adopted, the plugging system can be conveniently removed from the well after drilling and grinding. Further, delay of the production time of the oil well is avoided, construction cost is saved, residues in the well can be reduced, and blockage of the sleeve is avoided. Under the certain circumstances of sleeve internal diameter in the pit, because remove the cone structure, the wall thickness of cassette is thinner, and the size of the inside passage of cassette is bigger, is convenient for well liquid to flow and does benefit to well liquid and flowback, makes fracturing fluid or well impurity flowback efficient. Meanwhile, the plugging section 9 of the plugging body can be thickened, the supporting capacity of the plugging body on the integrated joint hoop 23 is improved, and the plugging safety of the plugging system is improved.

Example 3

The present embodiment provides a method of plugging, see fig. 3-12, comprising employing a downhole plugging system as in embodiment 2; the method comprises the steps of setting and plugging:

specifically, the clamping seat is assembled at first, and the assembled clamping seat is as shown in fig. 8, so that the assembly time of the clamping seat can be saved and the construction time can be saved due to fewer structural members of the clamping seat.

And then executing a setting step, wherein the setting step comprises a recyclable expansion cone used for setting a clamping seat of the underground plugging system, the recyclable expansion cone comprises a push cylinder 5, one end of the push cylinder 5 is connected with a setting cylinder 8, the outer wall of one end, far away from the push cylinder 5, of the setting cylinder 8 is used for adapting to the inner wall of the butt integral joint hoop 23, an adapting joint 6 and a releasing rod 7 are arranged in the push cylinder 5 along the axial direction, and one end of the releasing rod 7 is connected with one end of the adapting joint 6, and the other end of the releasing rod is used for connecting the lower joint 4 of the clamping seat.

Specifically, the steps are executed firstly: the recyclable expansion cone is assembled, and the assembled recyclable expansion cone is shown in fig. 11.

Then the following steps of the setting step are performed:

the method comprises the following steps: one end of the throwing rod 7 penetrates through the integrated joint hoop 23 and is detachably connected to the lower joint 4, and the setting cylinder 8 is abutted against the inner wall of the integrated joint hoop 23, so that the matching end of the setting cylinder 8 and the integrated joint hoop 23 can play a guiding function, and the recyclable expansion cone and the clamping seat can be conveniently assembled;

step two: the recyclable expansion cone and the clamping seat are conveyed to a designated setting position in the sleeve together to prepare for setting the clamping seat;

step three: applying an acting force to the adapting joint 6 to the outside of the well, and simultaneously applying an acting force to the setting barrel 8 to the inside of the well by using the pushing barrel 5; that is to say, when producing the pulling force outside the well to lower clutch 4, promote the inside of setting section of thick bamboo 8 butt integral type festival hoop 23 through pushing ram 5, to the thrust of integral type festival hoop 23 application in the well, at this moment under the relative effort of lower clutch 4 and setting section of thick bamboo 8 to integral type festival hoop 23, the one end that setting section of thick bamboo 8 kept away from pushing ram 5 can also form the holding power to the inner wall of integral type festival hoop 23, the inflation direction of restriction integral type festival hoop 23 can avoid integral type festival hoop 23 to be destroyed, avoid sealing ring 2 and slips 3 to be destroyed promptly, can guarantee the setting safety of cassette. At the moment, the integral joint hoop 23 moves along the outer wall of the setting barrel 8, so that the integral joint hoop 23 deforms until the outer wall of the sealing ring 2 of the integral joint hoop 23 contacts the inner wall of the sleeve, and the slip teeth 32 of the slip 3 of the integral joint hoop 23 are anchored on the inner wall of the sleeve until the lower joint 4 is separated from the hand-throwing rod 7 and the lower joint 4 is separated from the integral joint hoop 23;

step four: retrieve recoverable formula inflation awl, sit and seal a section of thick bamboo 8 and can follow the same back-off well of a push-off cylinder 5, can carry out recycle, the sleeve only sits at the integral type section hoop 23 of sleeve inner wall and the lower clutch 4 that drops the shaft bottom in the pit this moment, sits and seals the construction and accomplish.

After the seat sealing construction of the card seat is completed, executing a sealing step: and (3) extending the plugging section 9 of the plugging body into the set integrated joint hoop 23, so that the outer wall of the plugging section 9 is abutted against the inner wall of the integrated joint hoop 23, and plugging the channel in the integrated joint hoop 23 by the plugging section 9, thereby completing the downhole plugging.

In this embodiment, the state of the plugging section 9 after plugging the integral joint band 23 is shown in fig. 6 to 7. In this embodiment, the plugging body comprises a straight cylinder section 10 and a plugging section 9, the radial outer diameter of the straight cylinder section 10 is larger than the inner size of the integral type joint hoop 23, and the plugging section 9 comprises a supporting section 91 and a guiding section 92. The guide section 92 of the plugging body is arranged at the lower end, then the plugging body is put into a downhole sleeve, the center of gravity of the plugging body is located on the central line of the plugging body, the center of gravity is located at the guide section 92, one end of the guide section 92 and one end of the supporting section 91 of the plugging body, which are close to the guide section 92, can stably enter the integrated joint hoop 23, the outer wall of the supporting section 91 of the plugging section 9 is tightly attached to the inner wall of the integrated joint hoop 23, and plugging is achieved.

Adopt this embodiment shutoff method to carry out the shutoff to the sleeve in the pit, through operation recoverable formula expansion cone setting cassette, the setting section of thick bamboo 8 of recoverable formula expansion cone can support from integral type festival hoop 23 is inside, carries on spacingly to the expansion deformation of integral type festival hoop 23, makes integral type festival hoop 23 radially outwards expansion deformation. Can be stable set the integrated section hoop 23 at telescopic assigned position department in the pit, guarantee that later stage shutoff body can be safe carry out the shutoff to integrated section hoop 23. The plugging body is operated to enter the inside of the set integrated section hoop 23 for plugging, the integrated section hoop 23 is assisted to bear pressure, the plugging well layer can be stabilized, the plugging construction safety is improved, and the safe implementation of the fracturing modification operation construction is ensured.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (12)

1. The utility model provides a plugging body, its characterized in that includes shutoff section (9), be equipped with support section (91) on shutoff section (9), support section (91) for having the hollow structure of a blind end, the outer wall of support section (91) is the conical surface, the blind end is located the tip of the centrum that the conical surface formed, the inner wall of the outer wall adaptation ball seat of support section (91).

2. The block body according to claim 1, characterized in that the blocking section (9) further comprises a guide section (92) connected with the closed end of the support section (91), the outer wall of the guide section (92) is conical, and the gradient of the outer wall of the guide section (92) in the axial direction is greater than the gradient of the outer wall of the support section (91) in the axial direction.

3. The occlusion body according to claim 2, characterized in that the end of the support section (91) remote from the closed end is provided with a straight cylinder section (10), the straight cylinder section (10) and the occlusion section (9) are an integral component, and the inner cavity of the straight cylinder section (10) is communicated with the inner cavity of the support section (91).

4. The occlusion body according to any of claims 1 to 3, characterized in that the outer wall of the support section (91) is provided with at least one circumferentially arranged groove (911), the interior of the groove (911) being adapted to provide a sealing ring or band (21).

5. A downhole plugging system comprising a cartridge and a plugging body according to any of claims 1-4;

the clamping seat comprises an integrated section hoop (23), the integrated section hoop (23) can form sealing with the inner wall of the underground sleeve and is anchored on the inner wall of the underground sleeve, a channel is axially arranged on the integrated section hoop (23), and the shape and the size of the inner wall of the integrated section hoop (23) are respectively matched with the shape and the size of the outer wall of the supporting section (91).

6. A downhole plugging system according to claim 5, wherein the integrated joint hoop (23) comprises a sealing ring (2) and a slip (3), the slip (3) comprises a slip bowl (31) and a number of slip teeth (32), the slip bowl (31) and the sealing ring (2) are both plastically deformable members, the slip bowl (31) and the sealing ring (2) are integrated members, one end of the slip bowl (31) is provided with the sealing ring (2) and the other end is provided with a lower joint (4).

7. Downhole plugging system according to claim 6, wherein the end of the slip bowl (31) provided with the lower sub (4) has several toothed plates (311), and wherein between two adjacent toothed plates (311) there is a gap (33), said gap (33) being arranged in the axial direction of the slip bowl (31).

8. Downhole plugging system according to claim 7, wherein the gap (33) comprises a gap bottom (331) and a gap neck (332), the gap bottom (331) being a stress hole, the gap neck (332) being a strip groove, the stress hole and the strip groove communicating, the opening of the strip groove being arranged at an end near the lower joint (4), the width of the gap neck (332) being smaller than the width of the gap bottom (331).

9. The downhole plugging system of claim 8, wherein the stress apertures are kidney apertures, regular polygon apertures, oval apertures, or circular apertures.

10. A downhole plugging system according to any of the claims 6-9, wherein the slip bowl (31) and the sealing ring (2) are members having an elongation between 14% and 40%.

11. A method of plugging comprising using the downhole plugging system of any of claims 6-10;

the plugging method of the underground plugging system comprises the following steps: and (3) extending the plugging section (9) of the plugging body into the set integrated section hoop (23), enabling the outer wall of the plugging section (9) to abut against the inner wall of the integrated section hoop (23), plugging the channel in the integrated section hoop (23) by the plugging section (9), and completing underground plugging.

12. The occlusion method of claim 11, further comprising, prior to the occluding step, a setting step;

the setting step comprises a recyclable expansion cone used for setting a clamping seat of the underground plugging system, the recyclable expansion cone comprises a push cylinder (5), one end of the push cylinder (5) is connected with a setting cylinder (8), the outer wall of one end, far away from the push cylinder (5), of the setting cylinder (8) is used for being matched and abutted against the inner wall of the integrated joint hoop (23), an adaptive joint (6) and a releasing rod (7) are axially arranged in the push cylinder (5), one end of the releasing rod (7) is connected with one end of the adaptive joint (6), and the other end of the releasing rod is used for being connected with the lower joint (4) of the clamping seat;

the setting step comprises the following steps:

the method comprises the following steps: one end of the throwing handle rod (7) penetrates through the integrated joint hoop (23) and is detachably connected to the lower joint (4), and the setting barrel (8) abuts against the inner wall of the integrated joint hoop (23);

step two: the recyclable expansion cone and the clamping seat are conveyed to a designated setting position in the sleeve together;

step three: applying an uphole force to the adapter (6) while applying an uphole force to the setting cylinder (8) using the pusher (5), moving the integral joint hoop (23) along the outer wall of the setting cylinder (8), deforming the integral joint hoop (23) until its outer wall contacts the inner wall of the sleeve and anchoring the integral joint hoop (23) to the inner wall of the sleeve until the lower joint (4) is disconnected from the thrower lever (7) and the lower joint (4) is disconnected from the integral joint hoop (23);

step four: and recovering the recoverable expansion cone, and finishing the setting construction.

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