Hydraulic anchor with automatic righting effect for oil operation

Abstract

The present application relates to the technical field of oil exploitation, in particular to a hydraulic anchor with automatic righting effect for oil operation, which comprises a hydraulic anchor body and upper and lower connecting heads installed at the top and bottom of the hydraulic anchor body; a top-through hole, a middle-through hole and a bottom-through hole are formed in the side wall of the hydraulic anchor body from top to bottom, and the middle-through hole is centrally arranged; an anchoring assembly is slidably installed in the top-through hole, the middle-through hole and the bottom-through hole. The middle-through hole is horizontally and centrally arranged, and the top-through hole and the bottom-through hole are symmetrically and obliquely arranged, so that the path of the anchoring assembly in the middle-through hole to the downhole pipe wall is relatively short. Therefore, after the water pressure in the hydraulic anchor body is increased, the anchoring assembly in the middle-through hole will be pressed against the downhole pipe wall in advance, so that the axis of the hydraulic anchor body coincides with the axis of the downhole pipe string, thereby righting the hydraulic anchor body and avoiding the anchoring assembly from being fixedly failed due to the inclination of the hydraulic anchor body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil exploitation, in particular to a hydraulic anchor with automatic righting effect for oil operation. BACKGROUND

[0002] The hydraulic anchor is a key tool for fixing the wellbore in oil and gas exploitation, and the anchor jaw is embedded in the casing wall through the hydraulic pressure difference to realize axial anchoring and prevent displacement or bending of the pipe string caused by pressure, temperature or load changes.

[0003] The hydraulic anchor of the prior art is driven by pressure in the anchor pipe, and the anchor jaw on the circumferential surface of the anchor pipe is extended outward and contacted with the casing wall under the action of the hydraulic pressure generated by the internal and external pressure difference, thereby limiting the left and right movement of the hydraulic anchor in the casing and achieving anchoring; after the internal and external pressure difference of the anchor pipe is eliminated, the anchor jaw is reset under the elastic force of the internal reset spring between the baffle and the anchor jaw, and the anchoring is released, for example, the publication number CN221703687U.

[0004] The hydraulic anchor of the prior art has the following technical problems in use,

[0005] Firstly, if the hydraulic anchor is inclined in the wellbore, the anchor jaw may not be uniformly embedded in the casing wall, resulting in unilateral overload. For example, the anchor jaw of the traditional vertical design is prone to breakage or jamming due to local stress concentration in the inclined state.

[0006] Secondly, during use of the hydraulic anchor, oil and impurities and silt in the oil are prone to enter the space where the spring is located through the gap between the baffle and the split groove over time, hindering the spring from resetting, so that the anchor jaw cannot be normally recovered. Therefore, the prior art generally needs to install a sealing element in the gap between the baffle and the split groove, but the sealing element is prone to deformation under pressure in the high-pressure environment in the well for a long time, causing oil to seep into the space where the spring is located and corrode the spring. SUMMARY

[0007] The present application relates to the technical field of oil exploitation, in particular to a hydraulic anchor with automatic righting effect for oil operation.

[0008] The present application relates to the technical field of oil exploitation, in particular to a hydraulic anchor with automatic righting effect for oil operation.

[0009] The utility model provides a kind of hydraulic anchor with automatic righting effect for petroleum operation, it includes hydraulic anchor main part and installs upper connector and lower connector of hydraulic anchor main part top and bottom;The side wall of the hydraulic anchor main part is opened from top to bottom top-placed through-hole, middle-placed through-hole and bottom-placed through-hole, and middle-placed through-hole is in the middle;Top-placed through-hole, middle-placed through-hole and bottom-placed through-hole are opened with clamping groove, anchor assembly is slidably installed in top-placed through-hole, middle-placed through-hole and bottom-placed through-hole, sealing baffle is installed in the inside of clamping groove, sealing baffle is fixed in the inside of clamping groove by fixed pin, the anchor assembly includes anchor jaw, and anchor jaw is opened with accommodating groove, sealing baffle includes stopper, stopper is located in the inside of accommodating groove, and stopper is connected anchor jaw by reset spring;The slope sealing block is installed on the both sides of stopper, and stopper is attached accommodating groove groove wall by slope sealing block.

[0010] As a further scheme of the utility model: the inside of the stopper is opened with three-head hydraulic cavity, three-head hydraulic cavity is composed of top liquid pressing port and bottom two sides liquid outlet, lower pressing rod is installed on the top liquid pressing port of three-head hydraulic cavity, lower pressing plate is installed on the lower pressing rod, and lower pressing plate is connected reset spring.

[0011] As a further scheme of the utility model: push rod is installed on the two sides liquid outlet of three-head hydraulic cavity, slope sealing block is installed on the push rod, and the inside wall of accommodating groove is opened with inside wall slope, and slope sealing block is attached inside wall slope.

[0012] As a further scheme of the utility model: pressing plate spring is installed on the lower pressing plate, and lower pressing plate is connected stopper by pressing plate spring.

[0013] As a further scheme of the utility model: limit slot is clamped near the two sides liquid outlet of three-head hydraulic cavity, limit ring is installed on the push rod, and limit ring is located in the inside of limit slot and slides.

[0014] As a further scheme of the utility model: the top-placed through-hole is opened with inclination, and the top-placed through-hole and bottom-placed through-hole are symmetrically arranged.

[0015] The utility model has the advantages of:

[0016] (1) the utility model is arranged horizontally in the middle by middle-placed through-hole, and the top-placed through-hole and bottom-placed through-hole are symmetrically arranged with inclination, so that the path of anchor assembly in middle-placed through-hole to the pipe wall is relatively short, and thus, when the water pressure in the hydraulic anchor main part rises, the anchor assembly in middle-placed through-hole will press against the pipe wall in advance, so that the axis of the hydraulic anchor main part coincides with the axis of the pipe string, thereby righting the hydraulic anchor main part and avoiding the anchoring failure caused by the inclination of the hydraulic anchor main part.

[0017] As the water pressure in the hydraulic anchor main part rises, the anchor assemblies in the top-placed through-hole and bottom-placed through-hole press against the pipe wall, thereby fixing the pipe string.

[0018] (2) The hydraulic anchor sealing piece is adapted to the high-pressure working environment in the well, when the hydraulic pressure in the hydraulic anchor body slowly rises, the anchor assembly is ejected from the top hole, the middle hole and the bottom hole, at this time, the anchor jaw extrudes the reset spring, the reset spring presses the lower plate and the lower rod, the lower rod presses the hydraulic oil in the three-head hydraulic cavity, the hydraulic oil pushes the push rod and the inclined sealing block on both sides of the three-head hydraulic cavity to move outward, the inclined sealing block is pressed to fit the inclined surface of the inner wall, the seal between the containing groove and the block is reinforced, and the working environment of the high pressure in the well is adapted, the inclined sealing block is prevented from being deformed under the pressure in the high pressure environment in the well, and oil is prevented from seeping into the containing groove.

[0019] (3) When the anchor jaw is recycled, the inclined surface on the inclined sealing block is matched with the inner wall inclined surface on the inner wall of the containing groove, the inner wall inclined surface extrudes the inclined sealing block, the gap between the block and the containing groove is compensated, and the gap between the block and the containing groove is avoided due to slow rebound of the inclined sealing block, oil seeps into the containing groove through the gap and corrodes the reset spring. BRIEF DESCRIPTION OF DRAWINGS

[0020] The application will be further described below with reference to the drawings.

[0021] Figure 1 is a schematic diagram of the overall structure of the application;

[0022] Figure 2 is a schematic diagram of the internal structure of the application;

[0023] Figure 3 is a distribution diagram of the top hole, the middle hole and the bottom hole;

[0024] Figure 4 is a structure comparison diagram of the anchor assembly;

[0025] Figure 5 is a schematic diagram of the connection structure of the anchor assembly and the middle hole;

[0026] Figure 6 is a schematic diagram of the connection structure of the anchor assembly and the sealing baffle;

[0027] Figure 7 is a sectional view of the overall structure of the anchor assembly and the sealing baffle;

[0028] Figure 8 is Figure 7 the enlarged view of the A part of the application.

[0029] In the figure: 1, hydraulic anchor body; 2, upper connector; 3, lower connector; 4, middle through hole; 5, top through hole; 6, bottom through hole; 7, anchor assembly; 701, anchor jaw; 702, containing groove; 703, inner wall slope; 8, sealing baffle; 801, stop block; 802, three-head hydraulic chamber; 803, lower pressing plate; 804, lower pressing rod; 805, pressing plate spring; 806, push rod; 807, slope sealing block; 808, limiting groove; 809, limiting ring; 9, reset spring; 10, clamping groove; 11, fixing pin. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] Please refer to Figures 1-8 As shown in the figure, the present application is a hydraulic anchor for oil operation with automatic righting effect, which comprises a hydraulic anchor body 1 and upper and lower connectors 2 and 3 installed at the top and bottom of the hydraulic anchor body 1; the side wall of the hydraulic anchor body 1 is provided with a top through hole 5, a middle through hole 4 and a bottom through hole 6 from top to bottom, and the middle through hole 4 is in the middle; the top through hole 5, the middle through hole 4 and the bottom through hole 6 are provided with clamping grooves 10, the anchor assembly 7 is slidably installed in the top through hole 5, the middle through hole 4 and the bottom through hole 6, the sealing baffle 8 is installed in the clamping groove 10, and the sealing baffle 8 is fixed in the clamping groove 10 by the fixing pin 11; the anchor assembly 7 comprises an anchor jaw 701, the anchor jaw 701 is provided with a containing groove 702, the sealing baffle 8 comprises a stop block 801, the stop block 801 is located in the containing groove 702, and the stop block 801 is connected to the anchor jaw 701 by the reset spring 9; the stop block 801 is provided with slope sealing blocks 807 on both sides, and the stop block 801 is attached to the groove wall of the containing groove 702 through the slope sealing blocks 807.

[0032] Specifically, the three-head hydraulic chamber 802 is provided in the stop block 801, the three-head hydraulic chamber 802 is composed of a top liquid pressing port and two bottom liquid outlet ports, the lower pressing rod 804 is installed on the top liquid pressing port of the three-head hydraulic chamber 802, the lower pressing plate 803 is installed on the lower pressing rod 804, and the lower pressing plate 803 is connected to the reset spring 9.

[0033] Specifically, the push rod 806 is installed on the two liquid outlet ports of the three-head hydraulic chamber 802, the slope sealing block 807 is installed on the push rod 806, the inner wall slope 703 is formed on the inner wall of the containing groove 702, and the slope sealing block 807 is attached to the inner wall slope 703.

[0034] It should be noted that, first, the anchor assembly 7 in the top-through hole 5, the middle-through hole 4 and the bottom-through hole 6 are of the same specification, and the outer anchor surface of the anchor assembly 7 in the top-through hole 5 and the bottom-through hole 6 is flush with the anchor assembly 7 in the middle-through hole 4, as shown in Figure 3 , to ensure that the anchor assembly 7 uniformly acts on the downhole pipe wall and enhances the stability of the hydraulic anchor body 1. Second, in the initial state, referring to Figures 7-8 , the push rod 806 is not pressed against the inclined sealing block 807, and at this time the inclined sealing block 807 is sealed and fitted to the inner wall inclined surface 703.

[0035] The use of the present application; first, the upper connector 2 and the lower connector 3 are respectively screwed with the pipeline, then water flow is poured into the inside of the hydraulic anchor body 1, and the hydraulic anchor body 1 is placed inside the downhole string; as the hydraulic pressure in the hydraulic anchor body 1 slowly rises, the pressure difference between the inside and outside of the hydraulic anchor body 1 will push the anchor assembly 7 out of the inside of the top-through hole 5, the middle-through hole 4 and the bottom-through hole 6 and extrude and fix it to the downhole pipe wall.

[0036] Specifically, since the middle-through hole 4 is horizontally and centrally arranged, and the top-through hole 5 and the bottom-through hole 6 are symmetrically and obliquely arranged, the path of the anchor assembly 7 inside the middle-through hole 4 to the downhole pipe wall is relatively short, therefore, after the water pressure in the hydraulic anchor body 1 rises, the anchor assembly 7 inside the middle-through hole 4 will be pre-pressed against the downhole pipe wall, promoting the hydraulic anchor body 1 axis to coincide with the downhole string axis, and then righting the hydraulic anchor body 1, avoiding the hydraulic anchor body 1 from tilting and causing the anchor assembly 7 to fail to fix; as the water pressure in the hydraulic anchor body 1 rises, the anchor assembly 7 in the top-through hole 5 and the bottom-through hole 6 is pressed against the downhole pipe wall, and then forms a fixation to the downhole string.

[0037] It should be noted that the sealing element installed between the gap between the stop block 801 and the accommodating groove 702 in the prior art is prone to deformation under high pressure in the downhole environment, causing oil to seep into the inside of the accommodating groove 702 and corrode the return spring 9, resulting in a decrease in the strength and toughness of the return spring 9 and difficulty in recovering the anchor assembly 7.

[0038] In order to adapt to the working environment of the hydraulic anchor sealing element in the downhole high pressure, during the process of slowly increasing the hydraulic pressure in the hydraulic anchor body 1, the anchor assembly 7 is pushed out from the inside of the top-through hole 5, the middle-through hole 4 and the bottom-through hole 6, at this time the anchor jaw 701 extrudes the return spring 9, the return spring 9 presses the lower pressing plate 803 and the lower pressing rod 804, the lower pressing rod 804 presses the hydraulic oil inside the three-head hydraulic chamber 802, the hydraulic oil pushes the push rod 806 and the inclined sealing block 807 on both sides of the three-head hydraulic chamber 802 to move outward, and the inclined sealing block 807 is pressed to fit the inner wall inclined surface 703, thereby reinforcing the sealing between the accommodating groove 702 and the stop block 801, and then adapting to the working environment of the downhole high pressure.

[0039] If the anchor claw 701 needs to be recovered, the water pressure inside the hydraulic anchor body 1 is reduced, the hydraulic pressure inside the hydraulic anchor body 1 is reduced to drive the reset spring 9 to rebound and drive the anchor claw 701 to retract into the middle through hole 4, the pressure of the reset spring 9 acting on the lower pressing plate 803 is reduced, at this time the pressure on the inclined sealing block 807 is removed, the inclined sealing block 807 starts to recover, and due to the long time pressure on the inclined sealing block 807, the rebound speed of the inclined sealing block 807 is reduced, resulting in a gap between the stop block 801 and the containing groove 702 when the anchor claw 701 is recovered, causing oil to seep into the containing groove 702 and corrode the reset spring 9.

[0040] In order to avoid the above situation, the present application is provided with an inclined surface on the inclined sealing block 807 and an inner wall inclined surface 703 on the inner wall of the containing groove 702, which cooperates with the inclined surface on the inclined sealing block 807 to press the inclined sealing block 807 and compensate for the gap between the stop block 801 and the containing groove 702, avoiding the slow rebound of the inclined sealing block 807 and the seepage of oil into the containing groove 702.

[0041] It should be noted that the inner wall inclined surface 703 is inclined, and during the extension of the anchoring assembly 7, the distance between the inner wall inclined surface 703 and the inclined sealing block 807 increases, and the present application controls the inclination angle of the inner wall inclined surface 703 to be within 5°, ensuring that the stroke of the inclined sealing block 807 is greater than the distance change between the inner wall inclined surface 703 and the inclined sealing block 807, so that the inclined sealing block 807 is attached and pressed on the inner wall inclined surface 703.

[0042] Referring to Figures 7-8 , the lower pressing plate 803 is provided with a pressing plate spring 805, and the lower pressing plate 803 is connected to the stop block 801 through the pressing plate spring 805.

[0043] It should be noted that when the anchor claw 701 needs to be recovered, the anchor claw 701 is retracted by the rebound of the reset spring 9, at this time the force of the reset spring 9 acting on the lower pressing plate 803 is reduced, at this time the pressing plate spring 805 gradually rebounds to reset the lower pressing plate 803, and then the pressure of the push rod 806 on the inclined sealing block 807 is removed.

[0044] Referring to Figures 7-8 , the three-way hydraulic chamber 802 is provided with a limiting groove 808 near the liquid outlet on both sides, and the push rod 806 is provided with a limiting ring 809 which slides inside the limiting groove 808.

[0045] It should be noted that the limiting ring 809 is placed inside the limiting groove 808 to limit the push rod 806, avoiding excessive compression of the inclined sealing block 807 by the push rod 806, which causes damage to the inclined sealing block 807.

[0046] Referring to Figures 1-3The top-through hole 5 is obliquely arranged, and the top-through hole 5 and the bottom-through hole 6 are symmetrically arranged.

[0047] It should be noted that the middle-through hole 4 is horizontally and centrally arranged, the top-through hole 5 and the bottom-through hole 6 are symmetrically arranged with the middle-through hole 4 as a reference, and the oblique direction of the top-through hole 5 and the bottom-through hole 6 can be from inside to outside close to the middle-through hole 4 direction or from inside to outside away from the middle-through hole 4 direction.

[0048] The implementation principle of the present application is:

[0049] First, the upper connector 2 and the lower connector 3 are respectively threadedly connected with the pipeline, then water flow is poured into the inside of the hydraulic anchor body 1, and the hydraulic anchor body 1 is placed in the inside of the downhole string; as the hydraulic pressure in the hydraulic anchor body 1 slowly rises, the pressure difference between the inside and outside of the hydraulic anchor body 1 extrudes and fixes the anchoring assembly 7 from the inside of the top-through hole 5, the middle-through hole 4 and the bottom-through hole 6 to the downhole pipe wall.

[0050] Specifically, as the middle-through hole 4 is horizontally and centrally arranged, the top-through hole 5 and the bottom-through hole 6 are symmetrically and obliquely arranged, and the path of the anchoring assembly 7 in the middle-through hole 4 to the downhole pipe wall is relatively short, therefore, after the water pressure in the inside of the hydraulic anchor body 1 rises, the anchoring assembly 7 in the middle-through hole 4 will be pre-pressed against the downhole pipe wall, promoting the axis of the hydraulic anchor body 1 to coincide with the axis of the downhole string, and then righting the hydraulic anchor body 1, avoiding the anchoring assembly 7 from being fixed due to the inclination of the hydraulic anchor body 1; as the water pressure in the inside of the hydraulic anchor body 1 rises, the anchoring assembly 7 in the top-through hole 5 and the bottom-through hole 6 is pressed against the downhole pipe wall, and then forms a fixation to the downhole string.

[0051] It should be noted that the sealing element installed at the gap between the stop block 801 and the accommodating groove 702 in the prior art is easy to be deformed under high pressure in the downhole environment, causing oil to seep into the inside of the accommodating groove 702 to corrode the return spring 9, resulting in the strength and toughness of the return spring 9 being reduced, and the anchoring assembly 7 being difficult to recover.

[0052] In order to adapt to the working environment of the hydraulic anchor sealing element in the downhole high pressure, in the process of slowly rising the hydraulic pressure in the inside of the hydraulic anchor body 1, the anchoring assembly 7 is extruded from the inside of the top-through hole 5, the middle-through hole 4 and the bottom-through hole 6, at this time the anchoring jaw 701 extrudes the return spring 9, the return spring 9 presses the lower pressing plate 803 and the lower pressing rod 804, the lower pressing rod 804 presses the hydraulic oil in the inside of the three-head hydraulic cavity 802, the hydraulic oil pushes the push rod 806 and the inclined sealing block 807 on both sides of the three-head hydraulic cavity 802 to move outward, and the inclined sealing block 807 is pressed to adhere to the inclined surface 703 of the inner wall, so as to reinforce the sealing between the accommodating groove 702 and the stop block 801, and then adapt to the working environment of the downhole high pressure.

[0053] If the anchor claw 701 needs to be recovered, by reducing the water pressure inside the hydraulic anchor body 1, the hydraulic pressure inside the hydraulic anchor body 1 is reduced to drive the reset spring 9 to rebound and drive the anchor claw 701 to retract into the middle through hole 4, the pressure of the reset spring 9 acting on the lower pressing plate 803 is reduced, at this time the pressure on the inclined sealing block 807 is removed, the inclined sealing block 807 starts to recover, because the inclined sealing block 807 has been pressed for a long time, the rebound speed of the inclined sealing block 807 is reduced, resulting in a gap between the stop block 801 and the containing groove 702 when the anchor claw 701 is recovered, causing oil to seep into the containing groove 702 and corrode the reset spring 9;

[0054] In order to avoid the above situation, when the anchor claw 701 is recovered, the inclined surface on the inclined sealing block 807 cooperates with the inner wall inclined surface 703 on the inner wall of the containing groove 702, so that the inner wall inclined surface 703 extrudes the inclined sealing block 807, compensates the gap between the stop block 801 and the containing groove 702, and avoids the oil from seeping into the containing groove 702 due to the slow rebound of the inclined sealing block 807.

Claims

1. A hydraulic anchor for oil operations with automatic righting effect, characterized in that, The utility model provides a water anchor, which comprises a water anchor body (1), an upper connecting head (2) and a lower connecting head (3) installed at the top and bottom of the water anchor body (1); the side wall of the water anchor body (1) is provided with a top through hole (5), a middle through hole (4) and a bottom through hole (6) from top to bottom, and the middle through hole (4) is in the middle; The top through hole (5), the middle through hole (4) and the bottom through hole (6) are provided with a clamping groove (10), the water anchor body (1) is provided with an anchoring assembly (7) which is slidably installed in the top through hole (5), the middle through hole (4) and the bottom through hole (6), the clamping groove (10) is provided with a sealing baffle (8), the sealing baffle (8) is fixed in the clamping groove (10) by a fixing pin (11), the anchoring assembly (7) comprises a fluke (701), the fluke (701) is provided with a containing groove (702), the sealing baffle (8) comprises a stop block (801), the stop block (801) is located in the containing groove (702), and the stop block (801) is connected with the fluke (701) by a return spring (9); The stop block (801) is provided with a beveled sealing block (807) on both sides, and the stop block (801) is attached to the groove wall of the containing groove (702) through the beveled sealing block (807); The stop block (801) is provided with a three-head hydraulic cavity (802) inside, the three-head hydraulic cavity (802) is composed of a top liquid pressing opening and two bottom liquid outlet openings, the top liquid pressing opening of the three-head hydraulic cavity (802) is provided with a lower pressing rod (804), the lower pressing rod (804) is provided with a lower pressing plate (803), and the lower pressing plate (803) is connected with the return spring (9); The top through hole (5) is inclined, and the top through hole (5) and the bottom through hole (6) are symmetrically arranged.

2. The hydraulic anchor for oil exploitation with automatic righting effect according to claim 1, characterized in that, The two liquid outlet openings of the three-head hydraulic cavity (802) are provided with a push rod (806), the push rod (806) is provided with a beveled sealing block (807), the containing groove (702) is provided with an inner wall bevel (703) on the inner wall, and the beveled sealing block (807) is attached to the inner wall bevel (703).

3. The hydraulic anchor for oil exploitation with automatic righting effect according to claim 2, characterized in that, The lower pressing plate (803) is provided with a pressing plate spring (805), and the lower pressing plate (803) is connected with the stop block (801) through the pressing plate spring (805).

4. The hydraulic anchor for oil exploitation with automatic righting effect according to claim 3, characterized in that, The two liquid outlet openings of the three-head hydraulic cavity (802) are provided with a limiting groove (808), the push rod (806) is provided with a limiting ring (809), and the limiting ring (809) is slidably located in the limiting groove (808).

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