CN111022015B - Horizontal well open hole staged fracturing pipe column well descending device - Google Patents
Horizontal well open hole staged fracturing pipe column well descending device Download PDFInfo
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- CN111022015B CN111022015B CN201811178917.5A CN201811178917A CN111022015B CN 111022015 B CN111022015 B CN 111022015B CN 201811178917 A CN201811178917 A CN 201811178917A CN 111022015 B CN111022015 B CN 111022015B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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Abstract
The invention discloses a horizontal well open hole staged fracturing pipe column well descending device which comprises a core pipe, a rotary driving ring and a rotary outer sleeve, wherein the core pipe is arranged on the rotary driving ring; the core pipe is axially connected to the fracturing string, and a section of driving thread is arranged on the periphery of the core pipe; the axial length of the rotary driving ring is smaller than the height of the driving thread section on the core pipe, the inner wall of the rotary driving ring is provided with a thread structure matched with the driving thread on the core pipe, the rotary driving ring is connected to the driving thread section of the core pipe in a thread structure, and the rotary driving ring generates circumferential rotation in the linear displacement motion of the core pipe; the periphery of the rotating outer sleeve is provided with a spiral diversion trench, the rotating outer sleeve is movably sleeved on the periphery of the core pipe and corresponds to the position of the driving thread section on the core pipe, so that the rotating driving ring is positioned between the rotating outer sleeve and the core pipe, the rotating outer sleeve is provided with a stopping structure meshed with the rotating driving ring, and the rotating driving ring meshed together drives the rotating outer sleeve to generate circumferential rotation motion.
Description
Technical Field
The invention relates to a guiding (or assisting) device (or tool) for an open hole staged fracturing string of a horizontal well during well descending.
Background
Although the open hole staged completion technology has certain technical and economic advantages in the development of low-permeability oil and gas reservoirs, the problems of downhole resistance of the preset fracturing string of the horizontal well are more obvious due to the phenomena of necking and block dropping of open hole well sections in different degrees, once the downhole resistance occurs midway in the process of the fracturing string, the treatment means is extremely limited, the fracturing string cannot be normally put in place, and thus the occurrence of production zones and other well control risks is lost.
At present, for the downhole of an open hole staged fracturing pipe column of a horizontal well, the technical difficulty of casing pipe downhole is mainly reduced by three downhole auxiliary tools in China and abroad so as to improve the throughput.
The first type of the tool is a centralizer tool with balls, the friction resistance of a fracturing string in the well descending process is reduced by means of rolling friction of the balls on the centralizer, the technology has a centralizing effect on the fracturing string, but the technology is poor in adaptability in an open hole well wall and poor in stability and reliability.
The second is a turbine auxiliary tool, the drill bit is driven to rotate through throttling pressure difference of an inlet and an outlet, the technology can only be arranged at the tail end of a casing, the fracturing string is not righted, and the packer of the well completion fracturing string is easily accidentally set due to rotation of a pressure difference driving mode, so that secondary risks are generated, and the technology is not suitable for segmented well completion of an open hole packer.
And the third is a screw auxiliary tool, which is similar to a turbine auxiliary tool, and drives a drill bit to rotate through throttling pressure difference of an inlet and an outlet, and the screw auxiliary tool can only be arranged at the tail end of a casing, has no centralization effect on a fracturing string, and is not suitable for staged completion of open hole packers because the packer of the well completion fracturing string is easily accidentally set due to rotation of a pressure difference driving mode and has secondary risks.
In summary, the conventional auxiliary downhole tool specially used for the open hole staged fracturing string of the horizontal well is still in a technical blank state, and based on the actual operation condition requirements of a construction site and the technical problems of the conventional fishing tool in the using process, a downhole auxiliary tool which is simple in structure, convenient to operate, stable and reliable in operation and has the functions of righting and milling the well wall needs to be researched and developed.
Disclosure of Invention
The technical purpose of the invention is as follows: aiming at the particularity of the horizontal well open hole staged completion technology and the defects of the prior art, the horizontal well open hole staged fracturing pipe column well descending device is simple in structure, convenient to operate, stable and reliable in operation and capable of centralizing and milling the well wall.
The technical scheme adopted by the invention for realizing the technical purpose is that the downhole device of the horizontal well open hole staged fracturing string is used for assisting the downward placement of the open hole staged fracturing string in the horizontal well, and comprises:
-a core tube axially connected to the fracturing string, the core tube having a section of drive thread formed on its periphery;
-a rotary drive ring, the axial length of which is less than the height of the driving thread section on the core tube, the inner wall of the rotary drive ring being provided with a thread structure matching the driving thread on the core tube, the rotary drive ring being connected to the driving thread section of the core tube in a thread structure, the rotary drive ring producing a circumferential rotation during the linear displacement action of the core tube;
the outer sleeve is movably sleeved on the outer periphery of the core tube and corresponds to the position of the driving thread section on the core tube, so that the rotary driving ring is positioned between the rotary outer sleeve and the core tube, the rotary outer sleeve is provided with a braking structure meshed with the rotary driving ring, and the rotary driving ring meshed together drives the rotary outer sleeve to generate circumferential rotation motion.
As one of the preferable schemes, the inner wall of the rotating outer sleeve is of a step surface structure, and a stopping structure corresponding to the bottom end surface of the rotating driving ring is arranged on the step surface of the inner wall of the rotating outer sleeve. Furthermore, a detent ring is connected to the inner wall step surface of the rotating outer sleeve through a pin key, a plurality of ratchets are arranged on the top surface of the detent ring in the circumferential direction, a plurality of ratchets are arranged on the bottom end surface of the rotating driving ring in the circumferential direction, and the ratchets on the bottom end surface of the rotating driving ring are matched with the ratchets on the top surface of the detent ring and can be meshed with the ratchets in the up-down direction.
As one of the preferable schemes, the rotating outer sleeve mainly comprises an upper cylinder section and a lower cylinder section, the inner diameter of the upper cylinder section is larger than that of the lower cylinder section, the lower inner wall of the upper cylinder section is connected to the upper outer wall of the lower cylinder section in a threaded structure, and the top end face of the lower cylinder section forms a step structure on the inner wall of the upper cylinder section. Furthermore, a spiral diversion trench is formed in the periphery of the lower barrel section.
Preferably, a plurality of friction balls projected from an outer circumferential wall surface of the rotating sleeve are attached to the rotating sleeve.
Preferably, a plurality of guide ribs are formed on the inner wall of the rotary drive ring in a radially outward protruding manner along the height direction, each guide rib is provided with a thread structure matched with the drive thread on the core tube, and the rotary drive ring is connected to the drive thread section of the core tube through the thread structures on the plurality of guide ribs. Further, a plurality of guide ribs on the inner wall of the rotary driving ring are uniformly distributed in the circumferential direction.
Preferably, a sealing bush is connected to an inner wall of the rotating outer sleeve, the sealing bush is located between the rotating outer sleeve and the core tube and above the rotating drive ring, and the sealing bush seals an annular space between the core tube and the rotating outer sleeve.
Preferably, the upper end of the core tube is connected with an upper joint.
The beneficial technical effects of the invention are as follows:
1. the horizontal well casing string is formed by a simple structure, can be arranged at any end part of a packer of a horizontal well open hole staged fracturing string, and can play a role in righting the fracturing string in a normal state, when the fracturing string is lowered into the well and meets resistance, a downward axial displacement load can be converted into circumferential rotation torque at a resistance part, so that the well wall is milled while the fracturing string is righted, and good well-opening characteristics are realized, the characteristics can be repeatedly carried out along with the lifting and pressing of a core pipe, the operation is convenient, the operation is stable and reliable, the practicability is high, the passing capacity of the horizontal well open hole staged complex fracturing string is effectively improved, and the technical blank of assisting a lowering tool of the horizontal well open hole staged fracturing string is filled;
2. the rotary outer sleeve structure not only ensures the specific displacement of the rotary driving ring on the core pipe, but also can effectively ensure the reliable braking combination with the rotary driving ring, thereby improving the stability and the reliability of the operation, which is more prominent and obvious particularly under the action of the braking ring;
3. the rotary outer sleeve structure and the braking ring structure are beneficial to reducing the technical difficulty of manufacturing and assembling forming, so that the forming structure is simplified and is convenient to maintain;
4. the friction ball structure on the rotary outer sleeve is beneficial to reducing the friction resistance of the well and improving the centralizing effect;
5. the rotary driving ring structure not only ensures the stable and reliable matching of the rotary driving ring structure and the core pipe, but also effectively ensures the reliable braking of the rotary driving ring structure and the rotary outer sleeve; in addition, the sealing bush of the invention can effectively prevent sundries from invading into the annular space between the core tube and the rotating outer sleeve, thereby ensuring the stable operation of the rotating driving ring on the core tube.
Drawings
Fig. 1 is a schematic view of the structure of the present invention in a depressed state.
Fig. 2 is a schematic structural diagram of the present invention in the lifted state.
The reference numbers in the figures mean: 1-a core tube; 2 — a rotational drive ring; 3, a guide rib; 4, feeding a barrel section; 5, a lower cylinder section; 6, upper joint; 7-sealing the bushing; 8-a detent ring.
Detailed Description
The present invention relates to a guiding (i.e., assisting) device (or tool) for an open hole staged fracturing string of a horizontal well during downhole operation, and the main technical content of the present invention will be described in detail with reference to a plurality of embodiments. The contents of the present invention are described in detail and specifically in embodiment 1 with reference to the drawings in the specification, that is, fig. 1 and fig. 2, and other embodiments are not separately depicted in the drawings, but the main structure of the embodiments can still refer to the drawings of embodiment 1. It is expressly noted here that the drawings of the present invention are schematic and have been simplified in unnecessary detail for the purpose of clarity and to avoid obscuring the technical solutions that the present invention contributes to the prior art.
Example 1
Referring to fig. 1 and 2, the present invention is used for assisting the lowering of an open hole staged fracturing string in a horizontal well, and comprises a core pipe 1, a rotary driving ring 2 and a rotary outer sleeve.
The lower end of the core pipe 1 is axially connected to a packer of the fracturing string, the upper end of the core pipe 1 is connected with an upper joint 6, and the core pipe 1 is connected with an oil pipe in the fracturing string through the upper joint 6. The periphery of the upper part of the core pipe 1 is provided with a section of inwards concave annular structure, the inner concave annular wall is provided with a driving thread to form a driving thread section, and due to the matching relation of the driving thread section and the upper joint 6, the upper end of the driving thread section on the core pipe 1 is blocked by the upper joint 6, so that a section of inwards concave driving thread structure is formed on the axial periphery of the core pipe 1.
The axial length of the rotary driving ring 2 is less than the height of the driving thread section on the core tube 1, and the inner diameter of the body of the rotary driving ring 2 is greater than the outer diameter of the driving thread section of the core tube 1, preferably matching the outer diameter of the body of the core tube 1. Two guide convex ridges 3 are formed on the inner wall of the rotary driving ring 2 in a radial outward protruding mode along the height direction, the two guide convex ridges 3 are uniformly distributed on the inner periphery of the rotary driving ring 2, and the inner diameter formed by the two guide convex ridges 3 is matched with the outer diameter of the driving thread section of the core tube 1; the aforesaid each guiding convex rib 3 is provided with a thread structure matching with the driving thread on the core tube 1, and the rotary driving ring 2 is connected on the driving thread section of the core tube 1 by the thread structure on the two guiding convex ribs 3. The rotary drive rings 2 assembled together in this configuration are capable of producing a circumferential rotary motion in the linear displacement motion of the core tube 1. The bottom end surface of the rotary driving ring 2 is provided with a plurality of ratchets along the circumference.
The rotary outer sleeve mainly comprises an upper cylinder section 4 and a lower cylinder section 5, the inner diameter of the upper cylinder section 4 is larger than that of the lower cylinder section 5, the inner diameter of the upper cylinder section 4 is larger than the outer diameter of the body of the core pipe 1 and is also slightly larger than the outer diameter of the rotary driving ring 2, and the inner diameter of the lower cylinder section 5 is matched with the outer diameter of the body of the core pipe 1; a plurality of ball mounting holes are formed in the radial direction of the upper cylinder section 4, the ball mounting holes are distributed along the axial direction of the upper cylinder section 4 in a staggered manner, a plurality of friction balls are mounted in each ball mounting hole, and the outermost friction ball extends outwards from the outer end of the corresponding mounting hole, so that a bulge is formed on the peripheral wall surface of the upper cylinder section 4; the periphery of the lower cylinder section 5 is provided with a spiral diversion trench. The lower inner wall of the upper cylinder section 4 is connected with the upper outer wall of the lower cylinder section 5 in a threaded structure, and the top end surface of the lower cylinder section 5 forms a step structure on the inner wall of the upper cylinder section 4. The top end face of the lower cylinder section 5, namely the inner wall step face of the rotating outer sleeve, is connected with a detent ring 8 in a pin key mode, the inner diameter of the detent ring 8 is matched with the outer diameter of the core tube 1 body, a plurality of ratchets are arranged on the top face of the detent ring 8 in the circumferential direction, the ratchet structure on the top face of the detent ring 8 is matched with the ratchet structure on the bottom end face of the rotating driving ring 2, and in the downward moving process of the rotating driving ring 2, the ratchet structure on the bottom end face of the rotating driving ring 2 can be meshed with the ratchet structure on the top face of the detent ring 8 in the up-down direction. The rotary outer sleeve of the structure is movably sleeved on the periphery of the core tube 1 and corresponds to the position of the driving threaded section on the core tube 1, so that the rotary driving ring 2 is positioned between the rotary outer sleeve and the core tube 1, and of course, the assembly structure of the rotary outer sleeve on the core tube 1 does not limit the circumferential rotation action of the rotary driving ring 2.
In order to ensure a reliable displacement of the rotary drive ring 2 on the core tube 1, a sealing bush 7 is connected to the inner wall of the upper barrel section 4 of the rotary outer sleeve, which sealing bush 7 is located between the rotary outer sleeve and the core tube 1 and above the rotary drive ring 2, the sealing bush 7 sealing off the annular gap between the core tube 1 and the rotary outer sleeve.
The working process of the invention is as follows:
under normal conditions, the present invention is able to centralize the fracturing string;
when the fracturing string is put into the well and is blocked, the core pipe 1 is subjected to downward axial displacement load to drive the rotary driving ring 2 in circumferential rotation to move downwards, the rotary driving ring 2 moving downwards to the position of the braking ring 8 is meshed with the braking ring 8, and due to the fixed connecting structure of the braking ring 8 and the rotary outer sleeve and the movable assembling structure of the rotary outer sleeve and the core pipe 1, the rotary driving ring 2 in circumferential rotation drives the rotary outer sleeve to rotate circumferentially due to the axial downward displacement of the core pipe 1, and the rotary outer sleeve in circumferential rotation can perform milling treatment on the well wall while strengthening the fracturing string, so that good well-opening characteristics are realized;
when the core tube 1 is axially displaced downwards to a position where it cannot drive the rotary driving ring 2 to rotate circumferentially, the core tube 1 is lifted upwards to separate the rotary driving ring 2 from the detent ring 8, while the rotary jacket remains static, and the rotary driving ring 2 rotates downwards during the lifting of the core tube 1, so as to form a driving force capable of driving the rotary jacket to rotate next time;
-reciprocating the core tube 1 down and up according to the operating conditions.
Example 2
The invention is used for assisting the lowering of an open hole staged fracturing string in a horizontal well and comprises a core pipe, a rotary driving ring and a rotary outer sleeve.
The lower end of the core pipe is axially connected to a packer of the fracturing string, the upper end of the core pipe is connected with an upper joint, and the core pipe is connected with an oil pipe in the fracturing string through the upper joint. The upper periphery of the upper part of the core pipe is provided with a section of inwards concave annular structure, the inner concave annular wall is provided with a driving thread section to form a driving thread section, and the upper end of the driving thread section on the core pipe is blocked by an upper joint due to the matching relation of the driving thread section and the upper joint, so that a section of inwards concave driving thread structure is formed on the axial periphery of the core pipe.
The axial length of the rotary driving ring is less than the height of the driving thread section on the core tube, and the inner diameter of the body of the rotary driving ring is greater than the outer diameter of the driving thread section of the core tube, preferably matched with the outer diameter of the body of the core tube. Two guide convex ridges are formed on the inner wall of the rotary driving ring in a radial outward protruding mode along the height direction, the two guide convex ridges are uniformly distributed on the inner periphery of the rotary driving ring, and the inner diameter formed by the two guide convex ridges is matched with the outer diameter of the driving thread section of the core pipe; the rotary driving ring is connected to the driving thread section of the core tube through the thread structures on the two guiding convex edges. The rotary drive rings assembled together in this configuration are capable of producing a circumferential rotary motion in the linear displacement motion of the core tube. The bottom end surface of the rotary driving ring is circumferentially provided with a plurality of ratchets.
The inner wall of the rotating outer sleeve is of a step surface structure, the inner diameter of the upper part of the step surface is larger than the inner diameter of the lower part of the step surface, the inner diameter of the upper part of the step surface is larger than the outer diameter of the body of the core pipe and is also slightly larger than the outer diameter of the rotating driving ring, and the inner diameter of the lower part of the step surface is matched with the outer diameter of the body of the core pipe. A plurality of ball mounting holes have been seted up to the upper portion of rotatory overcoat footpath, and these ball mounting holes are arranged along the axial direction of rotatory overcoat and the height is straggly, install many friction balls in every ball mounting hole, and the friction ball of outermost end outwards extends from the mounting hole outer end that corresponds to form protrudingly at the periphery wall on rotatory overcoat upper portion. Spiral guide grooves are formed in the periphery of the lower portion of the rotating outer sleeve. The inner wall step surface of the rotating outer sleeve is connected with a braking ring in a pin key mode, the inner diameter of the braking ring is matched with the outer diameter of the core tube body, a plurality of ratchets are arranged on the top surface of the braking ring in the circumferential direction, the ratchet structure on the top surface of the braking ring is matched with the ratchet structure on the bottom end surface of the rotating driving ring, and the ratchet structure on the bottom end surface of the rotating driving ring can be meshed with the ratchet structure on the top surface of the braking ring in the up-down direction in the moving-down process of the rotating driving ring. The rotary outer sleeve of the structure is movably sleeved on the periphery of the core pipe and corresponds to the position of the driving threaded section on the core pipe, so that the rotary driving ring is positioned between the rotary outer sleeve and the core pipe.
In order to ensure reliable displacement of the rotary drive ring on the core tube, a sealing bush is connected to the inner wall of the rotary outer sleeve, the sealing bush is arranged between the rotary outer sleeve and the core tube and above the rotary drive ring, and the sealing bush seals an annular gap between the core tube and the rotary outer sleeve.
The working process of the invention is as follows:
under normal conditions, the present invention is able to centralize the fracturing string;
when the fracturing string is put into the well and is blocked, the core pipe is subjected to downward axial displacement load to drive the rotating driving ring in circumferential rotation to move downwards, the rotating driving ring which moves downwards to the position of the braking ring is meshed with the braking ring, and due to the fixed connection structure of the braking ring and the rotating outer sleeve and the movable assembly structure of the rotating outer sleeve and the core pipe, the rotating driving ring in circumferential rotation drives the rotating outer sleeve to rotate circumferentially due to the axial downward displacement of the core pipe, and the rotating outer sleeve in circumferential rotation can perform milling treatment on the well wall while having a function of righting the fracturing string, so that good well-penetrating characteristics are realized;
when the core tube is axially and downwards displaced to a position where the core tube cannot drive the rotating driving ring to rotate circumferentially, the core tube is lifted up to separate the rotating driving ring from the detent ring, the rotating outer sleeve is kept static, and the rotating driving ring is rotated and reset during the lifting up of the core tube so as to form a driving force capable of driving the rotating outer sleeve for the next time;
-reciprocating the core tube down and up according to the operating conditions.
Example 3
The invention is used for assisting the lowering of an open hole staged fracturing string in a horizontal well and comprises a core pipe, a rotary driving ring and a rotary outer sleeve.
The lower end of the core pipe is axially connected to a packer of the fracturing string, the upper end of the core pipe is connected with an upper joint, and the core pipe is connected with an oil pipe in the fracturing string through the upper joint. The upper periphery of the upper part of the core pipe is provided with a section of inwards concave annular structure, the inner concave annular wall is provided with a driving thread section to form a driving thread section, and the upper end of the driving thread section on the core pipe is blocked by an upper joint due to the matching relation of the driving thread section and the upper joint, so that a section of inwards concave driving thread structure is formed on the axial periphery of the core pipe.
The axial length of the rotary driving ring is less than the height of the driving thread section on the core tube, and the inner diameter of the body of the rotary driving ring is greater than the outer diameter of the driving thread section of the core tube, preferably matched with the outer diameter of the body of the core tube. Two guide convex ridges are formed on the inner wall of the rotary driving ring in a radial outward protruding mode along the height direction, the two guide convex ridges are uniformly distributed on the inner periphery of the rotary driving ring, and the inner diameter formed by the two guide convex ridges is matched with the outer diameter of the driving thread section of the core pipe; the rotary driving ring is connected to the driving thread section of the core tube through the thread structures on the two guiding convex edges. The rotary drive rings assembled together in this configuration are capable of producing a circumferential rotary motion in the linear displacement motion of the core tube. The bottom end surface of the rotary driving ring is circumferentially provided with a plurality of ratchets.
The inner wall of the rotating outer sleeve is of a step surface structure, the inner diameter of the upper part of the step surface is larger than the inner diameter of the lower part of the step surface, the inner diameter of the upper part of the step surface is larger than the outer diameter of the body of the core pipe and is also slightly larger than the outer diameter of the rotating driving ring, and the inner diameter of the lower part of the step surface is matched with the outer diameter of the body of the core pipe. A plurality of ball mounting holes have been seted up to the upper portion of rotatory overcoat footpath, and these ball mounting holes are arranged along the axial direction of rotatory overcoat and the height is straggly, install many friction balls in every ball mounting hole, and the friction ball of outermost end outwards extends from the mounting hole outer end that corresponds to form protrudingly at the periphery wall on rotatory overcoat upper portion. Spiral guide grooves are formed in the periphery of the lower portion of the rotating outer sleeve. And a plurality of ratchets used for braking are arranged on the circumferential direction of the inner wall step surface of the rotating outer sleeve, the ratchet structure is matched with the ratchet structure on the bottom end surface of the rotating driving ring, and the ratchet structure on the bottom end surface of the rotating driving ring can be meshed with the ratchet structure on the step surface of the rotating outer sleeve in the up-down direction in the downward moving process of the rotating driving ring. The rotary outer sleeve of the structure is movably sleeved on the periphery of the core pipe and corresponds to the position of the driving threaded section on the core pipe, so that the rotary driving ring is positioned between the rotary outer sleeve and the core pipe.
In order to ensure reliable displacement of the rotary drive ring on the core tube, a sealing bush is connected to the inner wall of the rotary outer sleeve, the sealing bush is arranged between the rotary outer sleeve and the core tube and above the rotary drive ring, and the sealing bush seals an annular gap between the core tube and the rotary outer sleeve.
The working process of the invention is as follows:
under normal conditions, the present invention is able to centralize the fracturing string;
when the fracturing string is put into the well and is blocked, the core pipe is subjected to downward axial displacement load to drive the rotating driving ring in circumferential rotation to move downwards, the rotating driving ring moving downwards to the ratchet structure on the step surface of the rotating outer sleeve is meshed with the rotating outer sleeve, due to the movable assembly structure of the rotating outer sleeve and the core pipe, the rotating driving ring in circumferential rotation drives the rotating outer sleeve to rotate in circumferential direction due to the axial downward displacement of the core pipe, and the rotating outer sleeve in circumferential rotation can perform milling treatment on the well wall while having a function of righting the fracturing string, so that good well-passing characteristics are realized;
when the core tube is axially displaced downwards to a position where the core tube cannot drive the rotating driving ring to rotate circumferentially, the core tube is lifted upwards to separate the rotating driving ring from the rotating outer sleeve, the rotating outer sleeve is kept static, and the rotating driving ring rotates in the process of lifting the core tube to form a driving force capable of driving the rotating outer sleeve for the next time;
-reciprocating the core tube down and up according to the operating conditions.
Example 4
The invention is used for assisting the lowering of an open hole staged fracturing string in a horizontal well and comprises a core pipe, a rotary driving ring and a rotary outer sleeve.
The lower end of the core pipe is axially connected to a packer of the fracturing string, the upper end of the core pipe is connected with an upper joint, and the core pipe is connected with an oil pipe in the fracturing string through the upper joint. The upper periphery of the upper part of the core pipe is provided with a section of inwards concave annular structure, the inner concave annular wall is provided with a driving thread section to form a driving thread section, and the upper end of the driving thread section on the core pipe is blocked by an upper joint due to the matching relation of the driving thread section and the upper joint, so that a section of inwards concave driving thread structure is formed on the axial periphery of the core pipe.
The axial length of the rotary driving ring is smaller than the height of the driving thread section on the core tube, the inner diameter of the rotary driving ring is matched with the outer diameter of the driving thread section of the core tube, and the outer diameter of the rotary driving ring is larger than the outer diameter of the core tube. The inner wall of the rotary driving ring is provided with a thread structure matched with the driving thread on the core pipe, and the rotary driving ring is connected to the driving thread section of the core pipe in a thread structure. The rotary drive rings assembled together in this configuration are capable of producing a circumferential rotary motion in the linear displacement motion of the core tube. The outer edge of the bottom end surface of the rotary driving ring is circumferentially provided with a plurality of ratchets.
The rotating outer sleeve mainly comprises an upper cylinder section and a lower cylinder section, the inner diameter of the upper cylinder section is larger than that of the lower cylinder section, the inner diameter of the upper cylinder section is larger than the outer diameter of the body of the core pipe and is also slightly larger than that of the rotating driving ring, and the inner diameter of the lower cylinder section is matched with the outer diameter of the body of the core pipe; a plurality of ball mounting holes are formed in the radial direction of the upper barrel section, the ball mounting holes are distributed in a staggered manner along the axial direction of the upper barrel section, a plurality of friction balls are mounted in each ball mounting hole, and the outermost friction ball extends outwards from the outer end of the corresponding mounting hole, so that a bulge is formed on the peripheral wall surface of the upper barrel section; the periphery of the lower cylinder section is provided with a spiral diversion trench. The inner wall of the lower part of the upper cylinder section is connected with the outer wall of the upper part of the lower cylinder section in a threaded structure, and the top end surface of the lower cylinder section forms a step structure on the inner wall of the upper cylinder section. The top end face of the lower cylinder section, namely the inner wall step face of the rotating outer sleeve, is connected with a pulling ring in a pin key mode, the inner diameter of the pulling ring is matched with the outer diameter of the core pipe body, a plurality of ratchets are arranged on the top face of the pulling ring in the circumferential direction, the ratchet structure on the top face of the pulling ring is matched with the ratchet structure on the bottom end face of the rotating driving ring, and in the downward moving process of the rotating driving ring, the ratchet structure on the bottom end face of the rotating driving ring can be meshed with the ratchet structure on the top face of the pulling ring in the up-down direction. The rotary outer sleeve of the structure is movably sleeved on the periphery of the core pipe and corresponds to the position of the driving threaded section on the core pipe, so that the rotary driving ring is positioned between the rotary outer sleeve and the core pipe.
In order to ensure the reliable displacement of the rotating driving ring on the core tube, the inner wall of the upper barrel section of the rotating outer sleeve is connected with a sealing bush, the sealing bush is positioned between the rotating outer sleeve and the core tube and above the rotating driving ring, and the sealing bush seals an annular space gap between the core tube and the rotating outer sleeve.
The working process of the invention is as follows:
under normal conditions, the present invention is able to centralize the fracturing string;
when the fracturing string is put into the well and is blocked, the core pipe is subjected to downward axial displacement load to drive the rotating driving ring in circumferential rotation to move downwards, the rotating driving ring which moves downwards to the position of the braking ring is meshed with the braking ring, and due to the fixed connection structure of the braking ring and the rotating outer sleeve and the movable assembly structure of the rotating outer sleeve and the core pipe, the rotating driving ring in circumferential rotation drives the rotating outer sleeve to rotate circumferentially due to the axial downward displacement of the core pipe, and the rotating outer sleeve in circumferential rotation can perform milling treatment on the well wall while having a function of righting the fracturing string, so that good well-penetrating characteristics are realized;
when the core tube is axially and downwards displaced to a position where the core tube cannot drive the rotating driving ring to rotate circumferentially, the core tube is lifted up to separate the rotating driving ring from the detent ring, the rotating outer sleeve is kept static, and the rotating driving ring is rotated and reset during the lifting up of the core tube so as to form a driving force capable of driving the rotating outer sleeve for the next time;
-reciprocating the core tube down and up according to the operating conditions.
The above examples are intended to illustrate the invention, but not to limit it; although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the present invention may be modified from the embodiments described above or substituted for some of the technical features, and such modifications or substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a horizontal well bore hole staged fracturing tubular column device that descends well, the device that descends well is used as the transfer of guide bore hole staged fracturing tubular column in the horizontal well which characterized in that, the device that descends well includes:
-a core tube (1), wherein the core tube (1) is axially connected to the fracturing string, and a section of driving thread is arranged on the periphery of the core tube (1);
-a rotary drive ring (2), the axial length of the rotary drive ring (2) being smaller than the height of the drive thread section on the core pipe (1), the inner wall of the rotary drive ring (2) being provided with a thread structure matching the drive thread on the core pipe (1), the rotary drive ring (2) being connected to the drive thread section of the core pipe (1) in a thread structure, the rotary drive ring (2) producing a circumferential rotation in the linear displacement action of the core pipe (1);
-a rotating outer sleeve, wherein the periphery of the rotating outer sleeve is provided with a spiral diversion trench, the rotating outer sleeve is movably sleeved on the periphery of the core pipe (1) and corresponds to the position of the driving thread section on the core pipe (1), so that the rotating driving ring (2) is positioned between the rotating outer sleeve and the core pipe (1), the rotating outer sleeve is provided with a braking structure meshed with the rotating driving ring (2), and the rotating driving ring (2) meshed together drives the rotating outer sleeve to generate circumferential rotation motion.
2. The horizontal well open hole staged fracturing string downhole device according to claim 1, wherein the inner wall of the rotary outer sleeve is of a step surface structure, the braking structure is arranged on the step surface of the inner wall of the rotary outer sleeve, and the braking structure corresponds to the bottom end surface of the rotary driving ring (2).
3. The horizontal well open hole staged fracturing string downhole device according to claim 2, wherein the braking structure comprises a braking ring (8), a plurality of ratchets are arranged on the top surface of the braking ring (8) in the circumferential direction, the braking ring (8) is connected to the inner wall step surface of the rotating outer sleeve by a pin key, a plurality of ratchets are arranged on the bottom end surface of the rotating driving ring (2) in the circumferential direction, and the ratchets on the bottom end surface of the rotating driving ring (2) are matched with the ratchets on the top surface of the braking ring (8) and can be meshed with the ratchets on the top and bottom directions.
4. The horizontal well open hole staged fracturing string descending device according to claim 1, 2 or 3, wherein the rotary outer sleeve mainly comprises an upper cylinder section (4) and a lower cylinder section (5), the inner diameter of the upper cylinder section (4) is larger than that of the lower cylinder section (5), the inner wall of the lower part of the upper cylinder section (4) is connected to the outer wall of the upper part of the lower cylinder section (5) in a threaded structure, and the top end face of the lower cylinder section (5) forms a step surface structure on the inner wall of the upper cylinder section (4).
5. The horizontal well open hole staged fracturing string descending device according to claim 4, wherein the helical diversion trench is opened on the periphery of the lower barrel section (5).
6. The horizontal well open-hole staged fracturing string descending device according to claim 1, 2 or 3, wherein a plurality of friction balls protruding from the outer peripheral wall surface of the rotating outer sleeve are mounted on the rotating outer sleeve.
7. The horizontal well open hole staged fracturing string descending device according to claim 1 or 3, characterized in that a plurality of guiding ribs (3) are formed on the inner wall of the rotary driving ring (2) in a radially outward protruding manner along the height direction, each guiding rib (3) is provided with the thread structure matched with the driving thread on the core pipe (1), and the rotary driving ring (2) is connected to the driving thread of the core pipe (1) through the thread structures on the plurality of guiding ribs (3).
8. The horizontal well open hole staged fracturing string descending device according to claim 7, wherein the plurality of guiding ridges (3) on the inner wall of the rotary driving ring (2) are uniformly distributed in the circumferential direction.
9. The horizontal well open hole staged fracturing string descending device according to claim 1, wherein a sealing bush (7) is connected to the inner wall of the rotating outer sleeve, the sealing bush (7) is located between the rotating outer sleeve and the core pipe (1) and above the rotating driving ring (2), and the sealing bush (7) seals an annular space between the core pipe (1) and the rotating outer sleeve.
10. The horizontal well open hole staged fracturing string descending device is characterized in that an upper joint (6) is connected to the upper end of the core pipe (1).
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| CN201811178917.5A CN111022015B (en) | 2018-10-10 | 2018-10-10 | Horizontal well open hole staged fracturing pipe column well descending device |
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| CN201811178917.5A CN111022015B (en) | 2018-10-10 | 2018-10-10 | Horizontal well open hole staged fracturing pipe column well descending device |
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| CN111022015A CN111022015A (en) | 2020-04-17 |
| CN111022015B true CN111022015B (en) | 2021-09-24 |
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| CN201650257U (en) * | 2010-05-12 | 2010-11-24 | 中国石油集团西部钻探工程有限公司克拉玛依钻井工艺研究院 | Variable-diameter release type running tool |
| CA2751928C (en) * | 2010-09-09 | 2018-12-11 | Raymond Hofman | Self-orientating fracturing sleeve and system |
| CN201843531U (en) * | 2010-10-28 | 2011-05-25 | 中国石油集团渤海钻探工程有限公司 | Friction and torque reducing tool |
| CN202157772U (en) * | 2011-06-23 | 2012-03-07 | 中国石油天然气股份有限公司 | Packer dismantling and twisting device for oil well |
| CN202745765U (en) * | 2012-05-28 | 2013-02-20 | 中国石油天然气集团公司 | Rotary short joint |
| CN103015906B (en) * | 2012-12-24 | 2015-06-24 | 中国石油化工股份有限公司 | Drag reduction short joint of drilling tool |
| CN103291235B (en) * | 2013-06-08 | 2015-07-08 | 四机赛瓦石油钻采设备有限公司 | Tool for sending hydraulic packer into well |
| CN103321588B (en) * | 2013-07-17 | 2015-09-09 | 濮阳市东昊机械电子有限公司 | Sealing on-off connector |
| BR112016022323A2 (en) * | 2014-03-27 | 2017-08-15 | Slurry Solutions Inc | POSITIVE CEMENT PLACING TOOL |
| CN105696949A (en) * | 2014-11-25 | 2016-06-22 | 中国石油化工股份有限公司 | Moving type rotary centering guide |
| CN104790893A (en) * | 2015-02-12 | 2015-07-22 | 中国海洋石油总公司 | Feeding tool assembly for suspending packer used for horizontal well multi-sectional fracture |
| CN205605133U (en) * | 2016-04-20 | 2016-09-28 | 东营百华石油技术开发有限公司 | Oil field downhole tool position regulator |
| CN206503574U (en) * | 2017-02-23 | 2017-09-19 | 中石化石油工程技术服务有限公司 | Ball type centralizer |
| CN207033364U (en) * | 2017-07-01 | 2018-02-23 | 济源华新石油机械有限公司 | A kind of drilling string stabilizer for slowing down jarring |
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