CN203223203U - Hanging packer for open hole completion pipe string - Google Patents

Abstract

The utility model relates to the technical field of oil and gas field open hole horizontal well multi-section fracture, in particular to a hanging packer for an open hole completion pipe string. The hanging packer for the open hole completion pipe string is composed of a center pipe, an upper guiding ring, a glued dowel, an upper clamping tile, an upper cone, a cutting dowel, an outer back band, an inner back band, an upper rubber sleeved check ring, a rubber barrel bearing ring, a rubber barrel, an upper rubber sleeve check ring, a lower cone, a lower clamping tile, a locking ring, a locking ring sleeve, an upper piston, an O-shaped ring, a splitting ring sleeve, a splitting ring, a lower piston, an upper setting sleeve, a lower setting sleeve, a lower guiding ring and a lower connector. The hanging packer for the open hole completion pipe string is mainly applied to open hole horizontal well multi-section fracture, the anchoring performance is reliable, the packer can resist high temperature and high pressure and reliably seal a large-scale casing pipe, and the maximum inner drift diameter can ensure that 20 fracture balls can pass through the packer to achieve maximization of the number of fractured layers.

Description

A Suspension Packer for Open Hole Completion String

technical field

The utility model relates to the technical field of multi-stage fracturing of open-hole horizontal wells in oil and gas fields, in particular to a suspension packer for an open-hole completion pipe string.

Background technique

The open-hole horizontal well multi-layer fracturing technology is an advanced well completion technology and one of the important production stimulation measures for the development of low-pressure and low-permeability oil and gas reservoirs. low merit. Open hole completion can better realize oil and gas drainage in the entire horizontal section, and this technology has been widely used abroad. Horizontal open-hole multi-stage fracturing is currently the main technical method for shale gas fracturing in North America.

Open-hole horizontal well multi-stage fracturing technology generally uses open-hole packers to isolate in stages. According to the needs of shale gas reservoir development, a packer is used to divide the horizontal well section into several sections. During hydraulic fracturing, the sliding sleeve at the end of the horizontal section is a pressure-opening sliding sleeve, and the other sliding sleeves are opened by throwing a ball. The second stage at the end of the horizontal section began to throw balls step by step for targeted fracturing construction.

In the open-hole fracturing completion string, the hanging packer must not only suspend the entire liner string, but also ensure its temperature and pressure resistance in the casing of the vertical well section, so as to achieve the purpose of hanging the liner weight and sealing. The spacer needs to maintain the largest internal diameter so that as many frac balls as possible can pass through the frac ball to maximize the number of fractured layers.

However, the product performance of ordinary packers cannot meet the requirements of hanging the liner, sealing the large-size casing and maintaining the maximum internal diameter. For this reason, a new type of suspension packer suitable for the vertical section of the completion string in open-hole horizontal wells has been developed to make it more practical in the staged fracturing of open-hole horizontal wells.

Contents of the invention

The purpose of the utility model is to overcome the above-mentioned shortcomings, and provide a suspension packer for open hole well completion strings, which has reliable anchoring performance, ensures that the packer can withstand high temperature and high pressure, can reliably seal large-size casing, and has the largest internal passage. The diameter can ensure that the number of fracturing layers is maximized through 20 fracturing balls.

In order to achieve the above technical purpose, the utility model provides a solution: a suspension packer for an open hole well completion string, including a central pipe and a rubber sleeve arranged on the central pipe, wherein the lower end of the central pipe is connected to the lower end of the central pipe. The joints are threaded and fixed with fastening pins; the whole connected by the center pipe and the lower joint is equipped with an upper guide ring, an upper slip, an upper cone, an upper outer back ring, an upper inner back ring, and a lower joint from top to bottom. Inner back ring, lower outer back ring, lower cone, lower slips, lock ring sleeve, upper piston, split ring sleeve, split ring, lower piston, upper set cover, lower set cover and lower guide ring; the upper guide The ring is threaded with the center pipe and fixed with pins; the upper slip and the upper cone are axially sleeved on the center pipe, one end of the upper slip contacts the upper guide ring and the step of the center pipe, and the other end contacts the upper cone , the upper cone is fixed on the central tube by shearing pins; there is a retaining ring between the central tube and the rubber tube, the retaining ring is in the middle of the rubber tube and is sealed with the central tube with an "O" ring, and the rubber tube The two ends are respectively inserted into the upper inner back ring, lower inner back ring, upper outer back ring, and lower outer back ring to form a rubber cartridge assembly. The rubber cartridge assembly is set on the central tube, and the upper outer back ring is in contact with the upper cone. The lower cone and the lower slips are axially sleeved on the center tube, one end of the lower cone is in contact with the lower outer backing ring and fixed on the center tube through shear pins; the lock ring sleeve is connected with the center tube through a lock ring, and The shear pin and the center tube are fixed, and the upper end surface of the lock ring sleeve is in contact with the end surface of the lower slip; the upper piston and the center tube are connected in a sliding and sealed manner through an "O" ring; the split ring sleeve and the lower piston are connected through a split The ring is fixed on the central tube, and the lower piston seals the central tube through the "O" ring; the upper setting sleeve is threadedly connected with the upper piston, and the upper setting sleeve, upper piston and lower piston all slide through the "O" ring and the central tube Sealed connection; the lower set cover is threadedly connected with the upper set cover, and the lower set cover, the upper set cover and the lower joint are all in sliding and sealed connection; the lower guide ring is threaded with the central pipe and fixed with pins.

Moreover, the central pipe has a radial first pressure transmission hole and a second pressure transmission hole, the first pressure transmission hole is located between the upper piston and the split ring sleeve, and the second pressure transmission hole is located between the upper setting sleeve and the lower joint between.

Moreover, the upper end of the central pipe is a horse-tooth button internal thread structure.

Moreover, the upper cone cooperates with the upper slip cone surface, and the lower cone cooperates with the lower slip cone surface.

Moreover, an upper rubber sleeve retaining ring and a lower rubber sleeve retaining ring are arranged between the upper inner back ring and the lower inner back ring of the rubber cartridge assembly; the upper outer back ring and the upper inner back ring of the rubber cartridge assembly A soft metal ring backing ring is formed, and the lower outer backing ring and the lower inner backing ring of the rubber cartridge assembly form a soft metal ring backing ring.

Moreover, a rubber cartridge retaining ring is arranged in the middle of the rubber cartridge, and an "O" ring is provided in the middle of the inner hole of the rubber cartridge retaining ring, which supports the center of the rubber cartridge to facilitate the expansion of the rubber cartridge. The cartridge retaining ring is cast iron.

Moreover, the part of the central tube that is in contact with the lock ring sleeve is provided with a serrated thread that guides the lock ring sleeve to go up, and can only go up, but not down.

Moreover, the lock ring adopts a single-slit internal and external tooth structure, and the lock ring sleeve is fixed in the notch groove of the lock ring by shear pins. The lock ring transmits pressure with the lock ring sleeve, goes up and locks the pressure on the center tube.

Moreover, the split ring is composed of an open C ring or two pieces of C rings.

Moreover, the two ends of the "O" ring that are slidingly and sealingly connected with the center pipe by the upper setting sleeve, the upper piston and the lower piston have "O" ring back rings, which can achieve good sliding sealing performance. The "O" ring backing is made of PTFE.

Two hydraulic cylinders and two pistons are installed in the suspension packer for the open hole completion pipe string of the utility model. When the packer is lowered to the design level, the two-stage piston is driven to cut off the lock ring sleeve by pressing inside the pipe. The shearing pin moves upward at the same time, squeezes the sealing rubber tube, breaks the slips and occludes the casing, and the lock ring locks the pressure to achieve reliable anchoring and sealing. This tool ensures that the packer is resistant to high temperature and high pressure, and can reliably seal large-size casings. The maximum internal diameter can ensure the maximum number of fracturing layers through 20 fracturing balls.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is an enlarged view of part A in Fig. 1 .

Fig. 3 is an enlarged view of part B in Fig. 1 .

Fig. 4 is an enlarged view of part C in Fig. 1 .

Among them, 1. Center tube, 2. Upper guide ring, 3. First fastening pin, 4. Upper slip, 5. Upper cone, 6. First shear pin, 7. Upper outer back ring, 8. Upper inner back ring, 9. Upper rubber sleeve retaining ring, 10. Rubber sleeve retaining ring, 11. First "O" ring, 12. Rubber sleeve, 13. Lower rubber sleeve retaining ring, 14. Lower inner back ring , 15, the lower outer back ring, 16, the lower cone, 17, the lower slip, 18, the lock ring, 19, the second fastening pin, 20, the lock ring sleeve, 21, the second shear pin, 22, the upper Piston, 23, second "O" ring, 24, third "O" ring, 25, "O" ring back ring, 26, split ring sleeve, 27, split ring, 28, lower piston, 29, Last set cover, 30, the third staring at pin, 31, set cover under, 32, lower guide ring, 33, lower joint, 34, the first pressure transmission hole, 35, the second pressure transmission hole.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

This embodiment provides a suspension packer for an open-hole completion string, including a center pipe 1 and a rubber sleeve 12 arranged on the center pipe 1. As shown in FIG. 1 , the lower end of the center pipe 1 and the lower joint 33 Threaded connection, and fixed with pins to prevent loosening; the whole connected by the central tube 1 and the lower joint 33 is equipped with the upper guide ring 2, the upper slip 4, the upper cone 5, and the upper outer back ring 7 in sequence from top to bottom , Upper inner back ring 8, lower inner back ring 14, lower outer back ring 15, lower cone 16, lower slips 17, lock ring sleeve 20, upper piston 22, split ring sleeve 26, split ring 27, lower piston 28 , the upper set cover 29, the lower set cover 31 and the lower guide ring 32; the upper guide ring 2 is threadedly connected with the central pipe 1 and is fixed and anti-loose with the first fastening pin 3; the upper slip 4 and the upper cone 5 is axially sleeved on the center tube 1, one end of the upper slip 4 contacts the upper guide ring 2 and the step of the center tube, and the other end contacts the upper cone 5, and the upper cone 5 is fixed on the center tube 1 by the first shear pin 6 Above; there is a retaining ring 10 between the central tube 1 and the rubber tube 12, the retaining ring 10 is in the middle of the rubber tube 12 and is sealed with the central tube 1 with the first "O" ring 11, and the rubber tube 12 is two The upper inner back ring 8, the lower inner back ring 14, the upper outer back ring 7, and the lower outer back ring 15 are inserted into the upper inner back ring 8 and the lower outer back ring 15 respectively to form a rubber cartridge assembly. The upper cone 5 is in contact, the lower cone 16 and the lower slip 17 are axially sleeved on the central tube 1, and one end of the lower cone 16 is in contact with the lower outer back ring 15 and fixed on the central tube 1 by the first shear pin 6 The lock ring sleeve 20 is connected to the central tube 1 through the lock ring 18, and is fixed and anti-rotated by the second shear pin 21 and the central tube 1, and the upper end surface of the lock ring sleeve 20 is in contact with the end surface of the lower slip 17; The piston 22 is connected to the central tube 1 through a second "O" ring 23 for sliding sealing; the split ring sleeve 26 and the lower piston 28 are fixed on the central tube 1 through the split ring 27, and the lower piston 28 is passed through the second "O" "Ring 23 seals the center tube 1; the upper set cover 29 is threadedly connected with the upper piston 22, and the upper set cover 29, upper piston 22 and lower piston 28 are all slidably sealed with the center tube 1 through the second "O" ring 23 connection; the lower set cover 31 is threadedly connected with the upper set cover 29, and the lower set cover 31, the upper set cover 29, and the lower joint 33 are all connected to the sliding seal through the third "O" ring 24; the lower guide The ring 32 is threadedly connected with the central pipe 1 and fixed and anti-loosening with the third fastening pin 30 .

Further, the central pipe 1 has a radial first pressure transmission hole 34 and a second pressure transmission hole 35, the first pressure transmission hole 34 is located between the upper piston 22 and the split ring sleeve 26, the second pressure transmission hole 35 Located between the upper set cover 29 and the lower joint 33.

Further, the upper end of the above-mentioned central pipe 1 has a horsetooth internal thread structure, which is convenient for the feeding of the suspension packer and the tie-back of the production string.

Further, the above-mentioned upper cone 5 is matched with the upper slip 4 with a tapered surface, and the lower cone 16 is matched with the lower slip 17 with a tapered surface.

Further, an upper rubber sleeve retaining ring 9 and a lower rubber sleeve retaining ring 13 are provided between the upper inner back ring 8 and the lower inner back ring 14 of the rubber cartridge assembly.

Further, the upper outer back ring 7 and the upper inner back ring 8 of the rubber cartridge assembly constitute a soft metal ring back; the lower outer back ring 15 and the lower inner back ring 14 of the rubber cartridge assembly constitute a soft metal ring back lock up.

Further, the middle part of the above-mentioned rubber cylinder 12 is provided with a rubber cylinder retaining ring 10 made of cast iron material, and a first "O" ring 11 is provided in the middle of the inner hole of the rubber cylinder retaining ring 10, which supports the core of the rubber cylinder to facilitate the glue The barrel expands.

Further, the part of the central tube 1 that is in contact with the lock ring sleeve 20 is provided with a serrated thread that guides the lock ring sleeve 20 to go upward, and only allows the lock ring sleeve 20 to go upward.

Further, the above-mentioned lock ring 18 adopts a single-cut internal and external tooth structure, and the lock ring sleeve 20 is fixed in the cutout groove of the lock ring 18 through the second pin 19, so as to prevent the lock ring sleeve 20 from going up. Rotate in the ring sleeve 20. The lock ring 18 transmits pressure along with the lock ring sleeve 20, goes up and locks the pressure on the central tube 1 .

Further, the above-mentioned split ring 27 is composed of an open C-ring or two C-rings for fixing the lower piston 28 .

Further, both ends of the third "O" ring 24 have "O" ring backing rings 25 made of polytetrafluoroethylene. The two ends of the third "O" ring 24 are equipped with "O" ring back rings 25 to achieve good sliding sealing performance.

The working principle of the utility model is: use the matching intubation tube or ball seat to form a seal at the inner hole of the packer, pressurize from the oil pipe, and the liquid passes through the first pressure transmission port and the second pressure transmission port of the suspension packer in the The upper piston 22 and the upper set cover 29 produce an axial upward thrust, which acts on the lock ring sleeve 20, and when the starting pressure is reached, the second shear pin 21 on the lock ring sleeve 20 drives the lock ring 18 to move upward together, and the upward movement squeezes the lower card. The shoe 17, the lower slip 17 transmits the force to the lower cone 16, and when it reaches a certain force value, the first shear pin 6 on the lower cone 16 is cut off, and the lower cone 16 squeezes the rubber cylinder 12 and the upper cone 5 upwards, reaching Cut off the first shear pin 6 on the upper cone 5 with a certain force, the lower cone 16 presses the upper slip 4 upward, the upper slip 4 breaks and bites the casing, the rubber tube 12 continues to expand, and the lower slip 17 continues upward After going up to a certain extent, the rubber tube 12 expands to seal the casing, and the lower slip 17 bites the casing to complete the setting; at the same time, the locking ring 18 inside the packer locks the setting force to maintain the seat seal between the slips and the rubber sleeve .

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements or deformations can also be made, these improvements or Deformation should also be regarded as the protection scope of the present utility model.

Claims (10)

1. A suspension packer for an open-hole well completion string, comprising a center pipe and a rubber sleeve arranged on the center pipe, characterized in that: the lower end of the center pipe is threadedly connected with the lower joint, and is fixed with fastening pins ; The whole connected by the center pipe and the lower joint is equipped with an upper guide ring, an upper slip, an upper cone, an upper outer back ring, an upper inner back ring, a lower inner back ring, a lower outer back ring, and a lower inner back ring from top to bottom. cone, lower slips, lock ring sleeve, upper piston, split ring sleeve, split ring, lower piston, upper set cover, lower set cover and lower guide ring; The pin is fixed; the upper slip and the upper cone are axially sleeved on the center tube, one end of the upper slip is in contact with the upper guide ring and the step of the center tube, and the other end is in contact with the upper cone, and the upper cone is fixed on the On the central tube; there is a retaining ring between the central tube and the rubber tube, the retaining ring is in the middle of the rubber tube and is sealed with the central tube with an "O" ring, and the two ends of the rubber tube are respectively inserted into the upper inner back ring, The lower inner back ring, upper outer back ring, and lower outer back ring constitute the rubber cartridge assembly, which is set on the central tube, the upper outer back ring is in contact with the upper cone, and the lower cone and the lower slip axially sleeve On the central tube, one end of the lower cone is in contact with the lower outer back ring and fixed on the central tube by a shear pin; The upper end surface of the ring sleeve is in contact with the end surface of the lower slip; the upper piston and the center pipe are connected in a sliding and sealed manner through an "O" ring; the split ring sleeve and the lower piston are fixed on the center pipe through the split ring, and the lower piston passes through the The "O" ring seals the central tube; the upper setting sleeve is threadedly connected with the upper piston, and the upper setting sleeve, upper piston and lower piston are all sliding and sealed with the central tube through the "O" ring; the lower setting sleeve is connected to the upper The setting sleeve is threadedly connected, and the lower setting sleeve, the upper setting sleeve, and the lower joint are all in sliding and sealed connection; the lower guide ring is threaded with the central pipe and fixed with fastening pins. 2. A hanging packer for open hole completion string according to claim 1, characterized in that: the central pipe has a first radial pressure transmission hole and a second pressure transmission hole, the first pressure transmission hole The pressure hole is located between the upper piston and the split ring sleeve, and the second pressure transmission hole is located between the upper setting sleeve and the lower joint. 3. A suspension packer for open hole completion string according to claim 1, characterized in that: the upper end of the central pipe is a horsetooth internal thread structure. 4. A suspension packer for open hole completion string according to claim 1, characterized in that: the upper cone cooperates with the upper slip cone surface, and the lower cone cooperates with the lower slip cone surface. 5. A suspension packer for open hole completion string according to claim 1, characterized in that: an upper rubber bushing is set between the upper inner back ring and the lower inner back ring of the rubber cartridge assembly Ring and lower rubber sleeve retaining ring; the upper outer back ring and upper inner back ring of the rubber cartridge assembly constitute a soft metal ring back ring, and the lower outer back ring and lower inner back ring of the rubber cartridge assembly form a soft metal ring Ring back ring. 6. A suspension packer for open hole completion string according to claim 1 or 5, characterized in that: a rubber sleeve retaining ring is arranged in the middle of the rubber sleeve, and the inner portion of the rubber sleeve retaining ring is There is an "O" ring in the middle of the hole, and the retaining ring of the rubber cylinder is made of cast iron. 7. The suspension packer for open hole completion string according to claim 1, characterized in that: the part of the center pipe in contact with the lock ring sleeve is provided with a serrated thread that guides the lock ring sleeve to go upward. 8. A hanging packer for open hole completion string according to claim 7, characterized in that: the lock ring adopts a single-cut inner and outer tooth structure, and the lock ring sleeve is fixed on the lock ring by shear pins. in the notch. 9. A suspension packer for open hole completion string according to claim 1, characterized in that: the split ring is composed of an open C ring or two C rings. 10. A suspension packer for open hole completion string according to claim 1, characterized in that: the upper set sleeve, the upper piston and the lower piston are connected to the center pipe by two "O" rings which are slidingly and sealingly connected to each other. The end has an "O" ring backing which is made of PTFE.

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