An integrated well plugging tool for oil and gas wells

Abstract

The application discloses an oil-gas-water well integrated well sealing tool, and belongs to the technical field of downhole plugging tools.The well sealing tool comprises a first casing, a second casing is fixedly installed at the lower end of the first casing, the inner diameter of the first casing is larger than that of the second casing, an auxiliary assembly is arranged on the first casing, a fixing assembly and a sealing assembly are arranged on the second casing, the fixing assembly can fix the well sealing tool, and under the action of a trapezoidal push plate and a triangular plate, the fixing assembly can actively assist in recovering the fixed sliding plate when the tool is recovered, so that the fixed sliding plate and the well wall are prevented from being engaged and thus cannot be recovered, and the tool cannot be taken out, the limitation on the grouting channel is released after the fixing and sealing of the tool are completed through the arrangement of two pressure release rotating plates, subsequent well sealing operation is facilitated, and the auxiliary assembly can reset the fixing assembly and the sealing assembly in a pressurized mode, so that the damage of the well sealing tool caused by pulling recovery is avoided.

Description

Technical Field

[0001] This invention relates to the field of downhole plugging tools, and in particular to an integrated well-sealing tool for oil, gas and water wells. Background Technology

[0002] Before being inserted into the well, the sealing tool undergoes steps such as well cleaning, borehole cleaning, and scraping. Then, the sealing tool is moved to the designated position and pressurized to fix and seal it. Existing sealing tools have poor stability after fixing and sealing, and are prone to loosening, which can cause the sealing tool to fall off, thus affecting the sealing effect during well sealing.

[0003] Chinese patent application CN112780217A discloses an integrated well sealing tool. Although the above patent can seal the well in one go, it achieves intermittent control by breaking the pin, which is easily affected by the service life and strength of the pin itself. This results in poor stability and high uncontrollability of the tool. Furthermore, it cannot fix the well sealing tool on its own and requires other tools for auxiliary fixation. Therefore, this invention provides an integrated well sealing tool for oil, gas and water wells. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing an integrated well-sealing tool for oil, gas, and water wells. It overcomes the problems of intermittent control achieved by pin breakage, which is easily affected by the lifespan and strength of the pin itself, resulting in poor tool stability, high uncontrollability, and the inability to secure the well-sealing tool independently, requiring auxiliary tools for fixation.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an integrated sealing tool for oil, gas and water wells, comprising a first casing, a second casing fixedly installed at the lower end of the first casing, the inner diameter of the first casing being larger than the inner diameter of the second casing, a fixing component and a sealing component being provided on the second casing, the fixing component comprising a fixing cylinder and a fixing seat fixedly mounted on the second casing, a fixing disc slidably mounted inside the fixing cylinder, a plurality of trapezoidal push plates fixedly mounted on the fixing disc, a plurality of fixing slide plates slidably mounted on the fixing seat, a plurality of short columns fixedly mounted on the outer side of the fixing slide plates, a triangular plate and a trapezoidal auxiliary plate fixedly mounted on the inner side of the fixing slide plates, a triangular groove cooperating with the triangular plate being provided on the trapezoidal push plate, and a sealing component comprising... The device includes a sealing cylinder and three annular push plates. The sealing cylinder is fixedly installed on the second sleeve. A sealing disc is slidably installed inside the sealing cylinder. The annular push plate closest to the sealing disc is fixedly connected to the sealing disc. Two adjacent annular push plates are fixedly connected. A sealing ring is provided between the annular push plate and the second sleeve. The sealing ring is fixedly connected to the corresponding annular push plate and the second sleeve. An auxiliary assembly is provided on the first sleeve. The auxiliary assembly includes an auxiliary cylinder fixedly installed on the first sleeve. An auxiliary disc one and an auxiliary disc two are slidably installed inside the auxiliary cylinder. Four auxiliary push rods are fixedly installed on the auxiliary disc one. Four reset push rods are slidably installed on the auxiliary disc two. There is friction between the reset push rods and the auxiliary disc two.

[0006] Furthermore, the fixing assembly also includes a second covering cylinder fixedly installed on the second sleeve, a second covering plate slidably installed inside the second covering cylinder, a second friction ring plate fixedly installed on the second covering plate, the fixed plate and the second friction ring plate both slidingly engage with the second sleeve, there is friction between the second friction ring plate and the second sleeve, a sealed chamber is formed between the second covering cylinder, the second sleeve and the second covering plate, and a sealed chamber is formed between the fixed cylinder, the second sleeve and the fixed plate.

[0007] Furthermore, four pressure-relieving cylinders are fixedly installed on the side of the fixed circular seat. Both the second covering circular plate and the fixed circular plate are slidably fitted with the pressure-relieving cylinders. A pressure-relieving piston rod is slidably installed inside each pressure-relieving cylinder. A third sleeve is fixedly installed on the fixed circular seat. A pressure-relieving circular plate is slidably installed inside the third sleeve. The pressure-relieving piston rods are all fixedly connected to the pressure-relieving circular plates. There is friction between the pressure-relieving circular plates and the third sleeve. The friction between the pressure-relieving circular plates and the third sleeve is greater than the friction between the second friction ring plate and the second sleeve.

[0008] Furthermore, the sealing assembly also includes a covering cylinder 1 fixedly installed on the second sleeve, a covering disc 1 slidably installed inside the covering cylinder 1, and a sealed chamber formed between the covering cylinder 1, the second sleeve, and the covering disc 1. A sealed chamber is also formed between the sealing cylinder, the second sleeve, and the sealing disc. A friction ring plate 1 is fixedly installed on the covering disc 1. Both the friction ring plate 1 and the sealing disc 1 are slidably fitted with the second sleeve. There is friction between the friction ring plate 1 and the second sleeve. The friction between the friction ring plate 1 and the second sleeve is the same as the friction between the friction ring plate 2 and the second sleeve. There is also friction between the sealing disc 1 and the second sleeve. The friction between the friction ring plate 1 and the second sleeve is greater than the friction between the sealing disc 1 and the second sleeve.

[0009] Furthermore, the second sleeve is provided with four pressure-dividing holes: one, two, three, and four. Pressure-dividing hole one communicates with the sealed chamber formed by the sealing cylinder, the second sleeve, and the sealing plate; pressure-dividing hole two communicates with the sealed chamber formed by the covering cylinder one, the second sleeve, and the covering plate one; pressure-dividing hole three communicates with the sealed chamber formed by the covering cylinder two, the second sleeve, and the covering plate two; and pressure-dividing hole four communicates with the sealed chamber formed by the fixed cylinder, the second sleeve, and the fixed plate.

[0010] Furthermore, a sealed chamber is formed between the first sleeve, the auxiliary cylinder, and the second auxiliary circular plate. Both the first and second auxiliary circular plates are slidably fitted with the second sleeve. The first sleeve has four auxiliary holes that communicate with the sealed chamber formed by the first sleeve, the auxiliary cylinder, and the second auxiliary circular plate. There is friction between the second auxiliary circular plate and the first sleeve. The friction between the second auxiliary circular plate and the first sleeve is greater than the friction between the first friction ring plate and the second sleeve. The friction between the reset push rod and the second auxiliary circular plate is greater than the friction between the second auxiliary circular plate and the first sleeve. Four auxiliary circular blocks are fixedly installed on the side of the second auxiliary circular plate. The first auxiliary circular plate has through holes that mate with the auxiliary circular blocks. The auxiliary circular blocks and the reset push rod are slidably fitted.

[0011] Furthermore, reset push block one and reset push block two are fixedly installed on the reset push rod. Reset push block one and reset push block two are magnetic. Auxiliary push block one and auxiliary push block two are fixedly installed on the auxiliary push rod. Reset push block one is used to push cover plate one to slide, auxiliary push block one is used to push sealing plate to slide, reset push block two is used to push cover plate two to slide, and auxiliary push block two is used to push fixed plate to slide.

[0012] Furthermore, a pressure relief rotating plate is rotatably mounted on the end of the second sleeve, and a torsion spring is provided between the pressure relief rotating plate and the second sleeve. Pressure relief ratchet is fixedly mounted symmetrically on the side of the pressure relief circular plate, and a pressure relief ratchet is rotatably mounted on the side of the pressure relief rotating plate. The pressure relief ratchet and the corresponding pressure relief ratchet constitute a ratchet mechanism.

[0013] Furthermore, exhaust pipes are provided on the auxiliary cylinder, the first covering cylinder, the sealing cylinder, the second covering cylinder, and the fixed cylinder. The annular push plate closest to the first covering cylinder and the sealing cylinder are in sliding fit, and the annular push plate is in sliding fit with the second sleeve.

[0014] The beneficial effects of this invention compared with the prior art are as follows: (1) By setting a fixing component, this invention can fix the well sealing tool, and under the action of the trapezoidal push plate and the triangular plate, when the tool is retrieved, it can actively assist in the retraction of the fixing slide plate, avoiding the fixing slide plate from getting stuck with the well wall and being unable to be retracted, thus preventing the tool from being retrieved. (2) By setting two pressure-relieving rotating plates, this invention can release the restriction on the grouting channel after the tool is fixed and sealed, which facilitates subsequent well sealing operations. (3) By setting an auxiliary component, this invention can reset the fixing component and the sealing component by pressurization, avoiding damage to the well sealing tool caused by pulling and retrieving. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of the second sleeve of the present invention.

[0017] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0018] Figure 4 for Figure 2 A magnified view of a portion of point B in the middle.

[0019] Figure 5 for Figure 2 A magnified view of a portion of point C.

[0020] Figure 6 This is a schematic diagram of the structure of the first sleeve of the present invention.

[0021] Figure 7 for Figure 6 A magnified view of a portion of point D.

[0022] Figure 8 for Figure 6 A magnified view of a portion of point E in the middle.

[0023] Figure 9 for Figure 6 A magnified view of a portion of point F in the middle.

[0024] Figure 10 This is a schematic diagram of the trapezoidal push plate of the present invention.

[0025] Figure 11 for Figure 10A magnified view of a portion of point G in the middle.

[0026] Figure 12 This is a cross-sectional view of the overall structure of the present invention.

[0027] Figure 13 for Figure 12 A magnified view of a portion of point H in the middle.

[0028] Figure 14 for Figure 12 A magnified view of a portion of point I in the middle.

[0029] Figure 15 for Figure 12 A magnified view of a portion of point J.

[0030] Reference numerals: 101-First sleeve; 102-Auxiliary cylinder; 103-Covering cylinder one; 104-Sealing cylinder; 105-Sealing ring; 106-Annular push plate; 107-Covering cylinder two; 108-Fixing cylinder; 109-Fixing seat; 110-Third sleeve; 111-Fixing slide plate; 112-Exhaust pipe; 113-Second sleeve; 114-Sealing plate; 115-Covering plate one; 116-Pressure dividing hole one; 117-Pressure dividing hole two; 118-Auxiliary push block one; 119-Auxiliary push rod; 120-Reset push rod; 121-Reset push block one ; 122-Relief cylinder; 123-Reset push block two; 124-Covering circular plate two; 125-Fixing circular plate; 126-Pressure dividing hole three; 127-Pressure dividing hole four; 128-Friction ring plate two; 129-Friction ring plate one; 130-Relief circular plate; 131-Relief ratchet; 132-Relief piston rod; 133-Auxiliary circular plate one; 134-Auxiliary circular plate two; 135-Auxiliary hole; 136-Auxiliary circular block; 137-Trapezoidal push plate; 138-Triangular plate; 139-Trapezoidal auxiliary plate; 140-Relief ratchet; 141-Relief rotating plate; 142-Auxiliary push block two. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0032] Example: Reference Figures 1-15An integrated sealing tool for oil, gas and water wells includes a first casing 101, a second casing 113 fixedly installed at the lower end of the first casing 101, the inner diameter of the first casing 101 being larger than the inner diameter of the second casing 113, the connection between the first casing 101 and the second casing 113 being arc-shaped, and a fixing assembly provided on the second casing 113, the fixing assembly including a cover cylinder 107, a fixing cylinder 108, and a fixing seat 109 fixedly installed on the second casing 113, a fixing disc 125 slidably installed inside the fixing cylinder 108, a cover disc 124 slidably installed inside the cover cylinder 107, and a friction ring plate 128 fixedly installed on the cover disc 124, the fixing disc 125 and the friction ring plate 128 both slidingly engaging with the second casing 113, the friction ring plate 128 slidingly engaging with the fixing cylinder 108, and friction between the friction ring plate 128 and the second casing 113.

[0033] A sealed chamber is formed between the second covering cylinder 107, the second sleeve 113, and the second covering plate 124. A sealed chamber is also formed between the fixed cylinder 108, the second sleeve 113, and the fixed plate 125. The second sleeve 113 is provided with four pressure-dividing holes 126 and 127. The pressure-dividing holes 126 are connected to the sealed chamber formed by the second covering cylinder 107, the second sleeve 113, and the second covering plate 124. The pressure-dividing holes 127 are connected to the sealed chamber formed by the fixed cylinder 108, the second sleeve 113, and the fixed plate 125.

[0034] Multiple fixed slide plates 111 are slidably mounted on the fixed round base 109. A spring is provided between the fixed slide plate 111 and the fixed round base 109. Multiple short columns are fixedly mounted on the outer side of the fixed slide plate 111. Multiple trapezoidal push plates 137 are fixedly mounted on the side of the fixed round plate 125. A triangular plate 138 and a trapezoidal auxiliary plate 139 are fixedly mounted on the inner side of the fixed round base 109. A triangular groove that cooperates with the triangular plate 138 is provided on the trapezoidal push plate 137.

[0035] Four pressure-relieving cylinders 122 are fixedly installed on the side of the fixed circular seat 109. The second covering circular plate 124 and the fixed circular plate 125 are both slidably engaged with the pressure-relieving cylinders 122. A pressure-relieving piston rod 132 is slidably installed inside each pressure-relieving cylinder 122. A third sleeve 110 is fixedly installed on the side of the fixed circular seat 109. A pressure-relieving circular plate 130 is slidably installed inside the third sleeve 110. The pressure-relieving piston rods 132 are all fixedly connected to the pressure-relieving circular plate 130. There is friction between the pressure-relieving circular plate 130 and the third sleeve 110. The friction between the pressure-relieving circular plate 130 and the third sleeve 110 is greater than the friction between the second friction ring plate 128 and the second sleeve 113.

[0036] The end of the second sleeve 113 is axially symmetrically mounted with a pressure relief plate 141. A torsion spring is provided between the pressure relief plate 141 and the second sleeve 113. One end of the torsion spring is fixedly connected to the pressure relief plate 141, and the other end of the torsion spring is fixedly connected to the second sleeve 113. A pressure relief ratchet 131 is symmetrically fixedly mounted on the side of the pressure relief plate 130. A pressure relief ratchet 140 is rotatably mounted on the side of the pressure relief plate 141. The pressure relief ratchet 140 and the corresponding pressure relief ratchet 131 constitute a ratchet mechanism.

[0037] In the initial position, the two pressure-relieving rotating plates 141 are engaged, and the lower end face of the second sleeve 113 is in contact with the two pressure-relieving rotating plates 141. At this time, the torsion spring between the pressure-relieving rotating plates 141 and the second sleeve 113 is compressed, the pressure-relieving ratchet 131 and the pressure-relieving ratchet 140 are engaged, the cover plate 124 and the fixed plate 125 are both located at the position closest to the first sleeve 101, and the triangular groove of the trapezoidal push plate 137 and the triangular plate 138 are engaged.

[0038] Pressurization is applied to the second sleeve 113 through the upper port of the first sleeve 101. Since the pressure relief plate 141 and the second sleeve 113 are in an engaged state, the lower end of the second sleeve 113 is sealed, thus increasing the pressure inside the second sleeve 113. This pressure increases, pushing the fixed circular plate 125 away from the first sleeve 101 through the pressure dividing hole 127. The fixed circular plate 125 moves relative to the pressure relief cylinder 122. Due to the friction between the friction ring plate 128 and the second sleeve 113, the covering plate 124 cannot move at this time. The movement of the fixed circular plate 125 causes the trapezoidal... Push plate 137 moves away from triangle plate 138, eventually contacting trapezoidal auxiliary plate 139. At this point, trapezoidal push plate 137 detaches and contacts triangle plate 138. Fixed circular plate 125 continues to move, causing trapezoidal push plate 137 to push trapezoidal auxiliary plate 139 away from the axis of second sleeve 113, thus causing fixed slide plate 111 to move away from the axis of second sleeve 113. The spring between fixed slide plate 111 and fixed circular seat 109 is compressed, eventually causing the short column on fixed slide plate 111 to contact the well wall.

[0039] When the fixed circular plate 125 cannot move, pressure continues to be applied to the second sleeve 113 through the first sleeve 101. Under the action of the pressure dividing hole 126, the covering circular plate 124 overcomes the friction between the friction ring plate 128 and the second sleeve 113 and moves away from the first sleeve 101. The covering circular plate 124 slides relative to the pressure relief cylinder 122, that is, it drives the friction ring plate 128 to move away from the first sleeve 101. Finally, the friction ring plate 128 covers the pressure dividing hole 127. At this time, the pressure in the sealed cavity formed by the fixed cylinder 108, the second sleeve 113 and the fixed circular plate 125 will no longer change, that is, the position of the fixed circular plate 125 is locked.

[0040] After the covering disc 124 becomes immobile, pressure continues to be applied to the second disc 113 through the first sleeve 101. Under the action of the pressure dividing hole 126, the auxiliary disc 133 inside the pressure relief cylinder 122 overcomes the friction between the pressure relief disc 130 and the third sleeve 110 and moves away from the first sleeve 101. The pressure relief piston rod 132 slides inside the pressure relief cylinder 122, thus causing the pressure relief disc 130 to move away from the first sleeve 101. Since the pressure relief ratchet 131 and the pressure relief ratchet 140 form a ratchet... The wheel mechanism drives the pressure relief ratchet 140 to rotate, at which point the pressure relief plate 141 cannot rotate, thereby compressing the torsion spring between the pressure relief ratchet 140 and the pressure relief plate 141. This causes the pressure relief shank 131 to disengage and contact the pressure relief ratchet 140. Under the action of the torsion spring between the pressure relief ratchet 140 and the pressure relief plate 141, as well as the torsion spring between the pressure relief plate 141 and the second sleeve 113, the pressure relief ratchet 140 and the pressure relief plate 141 are reset, that is, the pressure relief plate 141 disengages and contacts the lower end face of the second sleeve 113.

[0041] A sealing assembly is provided on the second sleeve 113. The sealing assembly includes a covering cylinder 103, a sealing cylinder 104, and three annular push plates 106. The covering cylinder 103 and the sealing cylinder 104 are fixedly installed on the second sleeve 113. A sealing plate 114 is slidably installed inside the sealing cylinder 104, and a covering plate 115 is slidably installed inside the covering cylinder 103. A friction ring plate 129 is fixedly installed on the covering plate 115. The friction ring plate 129 and the sealing cylinder 104 are in sliding engagement. Both the friction ring plate 129 and the sealing plate 114 are in sliding engagement with the second sleeve 113. There is friction between 129 and the second sleeve 113. The friction between friction ring plate 129 and the second sleeve 113 is the same as that between friction ring plate 128 and the second sleeve 113. There is friction between sealing disc 114 and the second sleeve 113. The friction between friction ring plate 129 and the second sleeve 113 is greater than that between sealing disc 114 and the second sleeve 113. A sealed chamber is formed between covering cylinder 103, the second sleeve 113, and covering disc 115. A sealed chamber is also formed between sealing cylinder 104, the second sleeve 113, and sealing disc 114.

[0042] The annular push plate 106 closest to the sealing circular plate 114 is fixedly connected to the sealing circular plate 114. Two adjacent annular push plates 106 are fixedly connected. A sealing ring 105 is provided between the annular push plate 106 and the second sleeve 113. The sealing ring 105 is fixedly connected to the corresponding annular push plate 106 and the second sleeve 113. The annular push plate 106 closest to the covering cylinder 103 is slidably engaged with the sealing cylinder 104. The annular push plate 106 is slidably engaged with the second sleeve 113.

[0043] The second sleeve 113 is provided with four pressure dividing holes 116 and four pressure dividing holes 117. The pressure dividing holes 116 are connected to the sealed chamber formed by the sealing cylinder 104, the second sleeve 113 and the sealing plate 114. The pressure dividing holes 117 are connected to the sealed chamber formed by the covering cylinder 103, the second sleeve 113 and the covering plate 115.

[0044] In the initial position, the sealing disc 114 and the pressure dividing hole 117 are both located closest to the first casing 101. The short column on the fixed slide plate 111 is in contact with the well wall, that is, the fixed disc 109 is in a fixed state. Pressurization continues to be applied into the second casing 113. Under the action of the pressure dividing hole 116, the sealing disc 114 overcomes the friction between the sealing disc 114 and the sealing cylinder 104 and moves away from the first casing 101. This causes the three annular push plates 106 to move away from the first casing 101, thereby compressing the three sealing rings 105. Finally, the sealing rings 105 contact the well wall, and the annular push plates 106 can no longer move, thus achieving the sealing of the well wall by the sealing rings 105.

[0045] After the sealing disc 114 can no longer move, pressure continues to be applied into the second sleeve 113. Under the action of the pressure dividing hole 117, the covering disc 115 overcomes the friction between the friction ring plate 129 and the second sleeve 113 and moves away from the first sleeve 101. Since the friction between the friction ring plate 128 and the second sleeve 113 is the same as the friction between the friction ring plate 129 and the second sleeve 113, the friction ring plate 128 and the friction ring plate 129 move synchronously, eventually causing the friction ring plate 129 to cover the pressure dividing hole 116. At this time, the pressure in the sealed cavity formed by the sealing cylinder 104, the second sleeve 113, and the sealing disc 114 will no longer change, thus locking the position of the fixed disc 125.

[0046] An auxiliary assembly is provided on the first sleeve 101. The auxiliary assembly includes an auxiliary cylinder 102 fixedly installed on the first sleeve 101. An auxiliary circular plate 133 and an auxiliary circular plate 134 are slidably installed inside the auxiliary cylinder 102. A sealed chamber is formed between the first sleeve 101, the auxiliary cylinder 102, and the auxiliary circular plate 134. Both the auxiliary circular plate 133 and the auxiliary circular plate 134 are slidably engaged with the second sleeve 113. Four auxiliary push rods 119 are fixedly installed on the auxiliary circular plate 133. Four reset push rods 120 are slidably mounted on the auxiliary circular plate 134. There is friction between the reset push rods 120 and the auxiliary circular plate 134, and there is friction between the auxiliary circular plate 134 and the first sleeve 101. The friction between the auxiliary circular plate 134 and the first sleeve 101 is greater than the friction between the friction ring plate 129 and the second sleeve 113. The friction between the reset push rods 120 and the auxiliary circular plate 134 is greater than the friction between the auxiliary circular plate 134 and the first sleeve 101.

[0047] The first sleeve 101 is provided with four auxiliary holes 135. The auxiliary holes 135 are connected to the sealed chamber formed by the first sleeve 101, the auxiliary cylinder 102, and the second auxiliary circular plate 134. Four auxiliary circular blocks 136 are fixedly provided on the side of the second auxiliary circular plate 134. The first auxiliary circular plate 133 is provided with through holes that cooperate with the auxiliary circular blocks 136. The auxiliary circular blocks 136 and the reset push rod 120 are slidably engaged.

[0048] Reset push rod 120 is fixedly mounted with reset push block 121 and reset push block 123. Reset push block 121 and reset push block 123 are magnetic. Auxiliary push rod 119 is fixedly mounted with auxiliary push block 118 and auxiliary push block 142. Reset push block 121 is used to push cover plate 115 to slide. Auxiliary push block 118 is used to push seal plate 114 to slide. Reset push block 123 is used to push cover plate 124 to slide. Auxiliary push block 142 is used to push fixed plate 125 to slide.

[0049] In the initial position, both auxiliary circular plate 133 and auxiliary circular plate 134 are located closest to the second sleeve 113. At this time, auxiliary circular block 136 and auxiliary circular plate 133 are not in contact. The end face of reset push block 123 contacts the side of fixed cylinder 108, the end face of auxiliary push block 142 contacts the inner side of fixed cylinder 108, reset push block 121 contacts the side of sealing cylinder 104, and auxiliary push rod 119 contacts the inner side of sealing cylinder 104.

[0050] When the lower end face of the second sleeve 113 contacts the pressure relief rotating plate 141, pressure is applied into the second sleeve 113, so that when the friction ring plate 129 covers the pressure dividing hole 116 and the friction ring plate 228 covers the pressure dividing hole 427, the covering round plate 115 contacts the reset push block 121, and the reset push block 121 adsorbs and fixes the covering round plate 115. The covering round plate 224 contacts the reset push block 223, and the reset push block 223 adsorbs and fixes the covering round plate 224, thus locking the positions of the reset push block 121 and the covering round plate 224.

[0051] When it is necessary to remove the sealing tool from the well, a steel ball with the same diameter as the inner diameter of the first casing 101 is inserted into the first casing 101 via a ball dropper. The steel ball engages with the arc-shaped surface at the connection between the first casing 101 and the second casing 113. Then, pressure is applied to the first casing 101. Under the action of the steel ball at the connection between the first casing 101 and the second casing 113, the pressure inside the first casing 101 increases. Under the action of the auxiliary hole 135, the auxiliary circular plate 134 overcomes the friction between the auxiliary circular plate 134 and the auxiliary cylinder 102 and moves away from the second casing 113. The friction between the auxiliary circular plate 134 and the reset push rod 120... Under the action, the reset push rod 120 and the auxiliary circular plate 134 move synchronously, which in turn causes the reset push block 121 and the reset push block 123 to move synchronously, so that the covering circular plate 115 and the covering circular plate 124 move, and the friction ring plate 128 and the friction ring plate 129 move synchronously, ultimately causing the auxiliary circular block 136 and the auxiliary circular plate 133 to engage, and the auxiliary circular plate 134 and the auxiliary circular plate 133 to contact. At this time, the friction ring plate 128 falls off from covering the pressure dividing hole 127, the friction ring plate 129 falls off from covering the pressure dividing hole 116, and the end face of the reset push rod 120 contacts the auxiliary cylinder 102.

[0052] Pressurization continues into the first casing 101. As the end face of the reset push rod 120 contacts the auxiliary cylinder 102, the reset push rod 120 cannot move further. Consequently, the auxiliary circular plate 134 moves relative to the reset push rod 120. At this time, the auxiliary circular plate 133 and the auxiliary circular plate 134 move synchronously, which in turn causes the auxiliary push block 118 and the auxiliary push block 142 to move synchronously. The auxiliary push block 118 contacts the sealing circular plate 114, causing the sealing circular plate 114 to move closer to the first casing 101. The auxiliary push block 142 contacts the fixed circular plate 125, causing the fixed circular plate 125 to move closer to the first casing 101. Finally, the sealing circular plate 114 and the fixed circular plate 125 return to their initial positions, thus causing the sealing ring 105 to fall off and contact the well wall.

[0053] When the fixed circular plate 125 moves, the trapezoidal push plate 137 first detaches and contacts the trapezoidal auxiliary plate 139. Then, the triangular groove of the trapezoidal push plate 137 contacts the triangular plate 138. Under the action of the triangular groove of the trapezoidal push plate 137, the triangular plate 138 moves towards the axis of the second sleeve 113, so that the fixed slide plate 111 moves towards the axis of the second sleeve 113, thereby preventing the fixed slide plate 111 from getting stuck with the well wall and unable to detach.

[0054] The auxiliary cylinder 102, the first covering cylinder 103, the sealing cylinder 104, the second covering cylinder 107, and the fixed cylinder 108 are all equipped with exhaust pipes 112, and each exhaust pipe 112 is equipped with a filter screen to prevent soil from entering the interior through the exhaust pipe 112.

[0055] Working principle: First, the first casing 101 is moved to the designated depth of the well, that is, the well sealing tool is moved to the designated position. Then, pressure is applied to the first casing 101 and the second casing 113. Under the action of pressure dividing holes 116, 117, 126, and 127, the fixed circular plate 125 first slides. Under the action of the trapezoidal push plate 137 and the trapezoidal auxiliary plate 139, the fixed sliding plate 111 contacts the well wall, and finally the fixed circular plate 125 can no longer move. At this time, the well sealing tool is fixed under the action of the fixed sliding plate 111. If pressure is applied again, the sealing circular plate 114 slides, that is, the annular push plate 106 slides, and then the three sealing rings 105 are squeezed. The sealing rings 105 contact the well wall, and finally the covering circular plate 115 can no longer move. At this time, under the action of the sealing rings 105, the lower half of the well sealing tool is in a sealed state.

[0056] As pressure continues to be applied, the first covering plate 115 and the second covering plate 124 slide synchronously, eventually causing the first friction ring plate 129 to cover the first pressure dividing hole 116 and the second friction ring plate 128 to cover the fourth pressure dividing hole 127, thus fixing the positions of the sealing plate 114 and the fixed plate 125. The first covering plate 115 contacts the first reset push block 121, and the second covering plate 124 contacts the second reset push block 123, thus fixing the positions of the first covering plate 115 and the second reset push block 123. As pressure continues to be applied, the pressure relief piston rod 132 slides, causing the pressure relief plate 130 to slide. Finally, the pressure relief ratchet 131 falls off and engages with the pressure relief ratchet 140, and the lower end face of the second sleeve 113 falls off and contacts the pressure relief rotating plate 141.

[0057] After completing the above steps, the well sealing tool is installed. Then, grout is injected into the well through the first casing 101 and the second casing 113 to seal the well.

[0058] After well sealing is completed, a steel ball with the same diameter as the inner diameter of the first casing 101 is dropped through the connection between the first casing 101 and the second casing 113. Then, pressure is applied into the first casing 101. Under the action of the auxiliary hole 135, the auxiliary circular plate 134 slides, causing the friction ring plate 128 to fall off and return to its initial position covering the pressure dividing hole 127, and the friction ring plate 129 to fall off and return to its initial position covering the pressure dividing hole 116. The pressure continues to be applied, and the auxiliary circular plate 133 and the auxiliary circular plate... Simultaneously, the second pusher 134 moves, and under the action of the auxiliary pusher 118, the sealing circular plate 114 returns to its initial position, and the sealing ring 105 falls off and contacts the well wall. Under the action of the auxiliary pusher 142, the fixing circular plate 125 returns to its initial position, and the fixing slide plate 111 falls off and contacts the well wall. Under the action of the trapezoidal pusher 137 and the triangular plate 138, the fixing slide plate 111 is prevented from getting stuck with the well wall and unable to fall off. Then the first casing 101 can be taken out as a whole, that is, the well sealing tool can be taken out.

[0059] After the well sealing tool is removed, pressure is applied to the auxiliary cylinder 102, the first covering cylinder 103, the sealing cylinder 104, the second covering cylinder 107, and the fixed cylinder 108 through the exhaust pipe 112, so that each component returns to its initial position. The pressure relief plate 130 and the pressure relief rotating plate 141 are returned to their initial positions manually.

[0060] This invention is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort are within the protection scope of this invention.

Claims

1. An integrated sealing tool for oil, gas and water wells, comprising a first casing (101), a second casing (113) fixedly installed at the lower end of the first casing (101), wherein the inner diameter of the first casing (101) is larger than the inner diameter of the second casing (113), characterized in that: The second sleeve (113) is provided with a fixing component and a sealing component. The fixing component includes a fixing cylinder (108) and a fixing seat (109) fixedly mounted on the second sleeve (113). A fixing circular plate (125) is slidably installed inside the fixing cylinder (108). Multiple trapezoidal push plates (137) are fixedly installed on the fixing circular plate (125). Multiple fixing slide plates (111) are slidably installed on the fixing seat (109). Multiple short columns are fixedly provided on the outer side of the fixing slide plate (111). A triangular plate (138) and a trapezoidal auxiliary plate (139) are fixedly installed on the inner side of the fixing slide plate (111). The trapezoidal push plate (137) is provided with a corresponding triangular plate. (138) The triangular groove of the sealing assembly includes a sealing cylinder (104) and three annular push plates (106). The sealing cylinder (104) is fixedly installed on the second sleeve (113). A sealing disc (114) is slidably installed inside the sealing cylinder (104). The annular push plate (106) closest to the sealing disc (114) is fixedly connected to the sealing disc (114). Two adjacent annular push plates (106) are fixedly connected. A sealing ring (105) is provided between the annular push plate (106) and the second sleeve (113). The sealing ring (105) is fixedly connected to the corresponding annular push plate (106) and the second sleeve (113). The first sleeve (101) is provided with an auxiliary component, which includes an auxiliary cylinder (102) fixedly installed on the first sleeve (101). An auxiliary circular plate one (133) and an auxiliary circular plate two (134) are slidably installed inside the auxiliary cylinder (102). Four auxiliary push rods (119) are fixedly installed on the auxiliary circular plate one (133), and four reset push rods (120) are slidably installed on the auxiliary circular plate two (134). There is friction between the reset push rods (120) and the auxiliary circular plate two (134).

2. The integrated well sealing tool for oil, gas and water wells according to claim 1, characterized in that: The fixing assembly also includes a second covering cylinder (107) fixedly installed on the second sleeve (113). A second covering plate (124) is slidably installed inside the second covering cylinder (107). A second friction ring plate (128) is fixedly installed on the second covering plate (124). The fixed plate (125) and the second friction ring plate (128) are both slidably engaged with the second sleeve (113). There is friction between the second friction ring plate (128) and the second sleeve (113). A sealed chamber is formed between the second covering cylinder (107), the second sleeve (113), and the second covering plate (124). A sealed chamber is also formed between the fixed cylinder (108), the second sleeve (113), and the fixed plate (125).

3. The integrated well sealing tool for oil, gas and water wells according to claim 2, characterized in that: Four pressure-relieving cylinders (122) are fixedly installed on the side of the fixed circular seat (109). The second covering circular plate (124) and the fixed circular plate (125) are both slidably fitted with the pressure-relieving cylinders (122). Pressure-relieving piston rods (132) are slidably installed inside each pressure-relieving cylinder (122). A third sleeve (110) is fixedly installed on the fixed circular seat (109). A pressure-relieving circular plate (130) is slidably installed inside the third sleeve (110). The pressure-relieving piston rods (132) are all fixedly connected to the pressure-relieving circular plate (130). There is friction between the pressure-relieving circular plate (130) and the third sleeve (110). The friction between the pressure-relieving circular plate (130) and the third sleeve (110) is greater than the friction between the second friction ring plate (128) and the second sleeve (113).

4. The integrated well sealing tool for oil, gas and water wells according to claim 3, characterized in that: The sealing assembly further includes a covering cylinder (103) fixedly installed on the second sleeve (113), a covering disc (115) slidably installed inside the covering cylinder (103), a sealed chamber formed between the covering cylinder (103), the second sleeve (113), and the covering disc (115), a sealed chamber formed between the sealing cylinder (104), the second sleeve (113), and the sealing disc (114), a friction ring plate (129) fixedly installed on the covering disc (115), and the friction ring plate (129) and the sealing disc (115) 114) is in sliding fit with the second sleeve (113). There is friction between the first friction ring plate (129) and the second sleeve (113). The friction between the first friction ring plate (129) and the second sleeve (113) is the same as the friction between the second friction ring plate (128) and the second sleeve (113). There is friction between the sealing round plate (114) and the second sleeve (113). The friction between the first friction ring plate (129) and the second sleeve (113) is greater than the friction between the sealing round plate (114) and the second sleeve (113).

5. The integrated well sealing tool for oil, gas and water wells according to claim 4, characterized in that: The second sleeve (113) is provided with four pressure-dividing holes: one (116), two (117), three (126), and four (127). The pressure-dividing hole one (116) is connected to the sealed chamber formed by the sealing cylinder (104), the second sleeve (113), and the sealing plate (114). The pressure-dividing hole two (117) is connected to the sealed chamber formed by the covering cylinder one (103), the second sleeve (113), and the covering plate one (115). The pressure-dividing hole three (126) is connected to the sealed chamber formed by the covering cylinder two (107), the second sleeve (113), and the covering plate two (124). The pressure-dividing hole four (127) is connected to the sealed chamber formed by the fixed cylinder (108), the second sleeve (113), and the fixed plate (125).

6. The integrated well sealing tool for oil, gas and water wells according to claim 5, characterized in that: A sealed chamber is formed between the first sleeve (101), the auxiliary cylinder (102), and the second auxiliary circular plate (134). Both the first auxiliary circular plate (133) and the second auxiliary circular plate (134) are slidably fitted with the second sleeve (113). The first sleeve (101) is provided with four auxiliary holes (135), which communicate with the sealed chamber formed by the first sleeve (101), the auxiliary cylinder (102), and the second auxiliary circular plate (134). There is friction between the second auxiliary circular plate (134) and the first sleeve (101). The friction between 34) and the first sleeve (101) is greater than the friction between friction ring plate 1 (129) and the second sleeve (113). The friction between the reset push rod (120) and the second auxiliary circular plate (134) is greater than the friction between the second auxiliary circular plate (134) and the first sleeve (101). Four auxiliary circular blocks (136) are fixedly provided on the side of the second auxiliary circular plate (134). The first auxiliary circular plate (133) is provided with through holes that cooperate with the auxiliary circular blocks (136). The auxiliary circular blocks (136) and the reset push rod (120) are in sliding cooperation.

7. The integrated well sealing tool for oil, gas and water wells according to claim 6, characterized in that: Reset push rod (120) is fixedly mounted with reset push block one (121) and reset push block two (123). Reset push block one (121) and reset push block two (123) are magnetic. Auxiliary push rod (119) is fixedly mounted with auxiliary push block one (118) and auxiliary push block two (142). Reset push block one (121) is used to push cover plate one (115) to slide. Auxiliary push block one (118) is used to push seal plate (114) to slide. Reset push block two (123) is used to push cover plate two (124) to slide. Auxiliary push block two (142) is used to push fixed plate (125) to slide.

8. The integrated well sealing tool for oil, gas and water wells according to claim 7, characterized in that: The end of the second sleeve (113) is axially symmetrically mounted with a pressure relief plate (141). A torsion spring is provided between the pressure relief plate (141) and the second sleeve (113). A pressure relief ratchet (131) is symmetrically fixedly mounted on the side of the pressure relief plate (130). A pressure relief ratchet (140) is rotatably mounted on the side of the pressure relief plate (141). The pressure relief ratchet (140) and the corresponding pressure relief ratchet (131) constitute a ratchet mechanism.

9. The integrated well sealing tool for oil, gas and water wells according to claim 8, characterized in that: The auxiliary cylinder (102), the first covering cylinder (103), the sealing cylinder (104), the second covering cylinder (107), and the fixed cylinder (108) are all equipped with exhaust pipes (112). The annular push plate (106) closest to the first covering cylinder (103) and the sealing cylinder (104) are in sliding fit. The annular push plate (106) is in sliding fit with the second sleeve (113).

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