Centralizing device for petroleum well cementation

Abstract

The utility model relates to the technical field of petroleum well cementation, in particular to a centralizing device for petroleum well cementation, which comprises a positioning mechanism for positioning a sleeve and a rolling mechanism for reducing friction force between the centralizing device and a well wall, and the rolling mechanism is mounted on the outer side of the positioning mechanism. By arranging the rolling mechanism, when the positions of the balls need to be adjusted, fixation above the lifting sleeve is relieved, the fixing bolt is loosened, the lifting sleeve is driven to ascend along the guide rod, when the lifting sleeve ascends to the corresponding position, the insertion rod is separated from the fixing rod, fixation of the fixing rod is relieved, and the fixing bolt is screwed to fix the lifting sleeve. And then the corresponding fixing rods are moved out of the through holes in the fixing frame and inserted into new through holes again, after the positions of the balls are adjusted, the fixing bolts are loosened, the lifting sleeve restores to the original position under the action of gravity, the fixing rods are fixed again, and finally the fixing bolts are tightened, and fixation above the lifting sleeve is restored again.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well cementing, in particular to a centralizing device for oil well cementing. Background Art

[0002] At present, in the cementing operation of oil and gas wells such as oil and natural gas, the common practice is to first drill a wellbore, then insert a casing into the wellbore, and then inject cement slurry into the casing, so that the cement slurry gushes out from the bottom of the casing and then returns upward along the annular space of the casing, so that the cement slurry fills the annular space between the casing and the well wall, and forms a cement ring after solidification to complete the cementing operation. During this process, it is necessary to ensure that the casing is centered in the wellbore and the deviation is minimized as much as possible, so a centralizer is required.

[0003] Publication No. (CN219081512U) discloses a drill pipe elastic centralizer for drilling tools. When the centralizer is lowered into the wellhead, the friction force on the well wall can be reduced by the rolling of the balls, and it is more convenient and fast during lowering. Among them, the centralizer can change the position of the balls at will under the action of the arc groove. When replacement is needed, only loosen the nut, and then manually adjust the position of the mounting plate. Under the action of the arc groove, the balls can always be kept in a normal working state. After the adjustment is completed, manually tighten the nut again. When the positions of multiple balls need to be adjusted, the above adjustment method takes a long time and the adjustment efficiency is relatively low, which needs to be improved. Content of the Utility Model

[0004] The purpose of the utility model is to provide a centralizing device for oil well cementing in order to solve the above problems.

[0005] The utility model realizes the above purpose through the following technical solutions:

[0006] A centralizing device for oil well cementing includes a positioning mechanism for positioning the casing, and further includes a rolling mechanism for reducing the friction force between the device and the well wall. The rolling mechanism is installed outside the positioning mechanism;

[0007] The rolling mechanism includes a fixed frame, a fixed rod is arranged inside the fixed frame, a fixing plate is installed at one end of the fixed rod, balls are installed on the fixing plate, a fixing component is installed on the fixed frame, the fixing component includes a guide rod, a lifting sleeve is arranged outside the guide rod, a lifting block is fixed on the lifting sleeve, a lifting plate is fixed on the lifting block, an insertion rod is fixed below the lifting plate, and a fixing bolt is installed inside the lifting sleeve.

[0008] Preferably, the positioning mechanism includes a connecting rod, and positioning rings are fixed above and below the connecting rod.

[0009] Preferably, a reinforcing mechanism is installed on the rolling mechanism. The reinforcing mechanism includes a threaded ring, a threaded rod is installed inside the threaded ring, and a knob is fixed above the threaded rod.

[0010] Preferably, the number of connecting rods is four, and the positioning ring is welded to the connecting rods.

[0011] Preferably, the lifting sleeve is slidably connected to the guiding rod, and the inserting rod is welded to the lifting plate.

[0012] Preferably, the knob is welded to the threaded rod, and the knob is made of stainless steel.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] By providing a rolling mechanism, when it is necessary to adjust the positions of a plurality of balls, release the fixation above the lifting sleeve and loosen the fixing bolt, drive the lifting sleeve to rise along the guiding rod, and the lifting block, the lifting plate and the inserting rod will rise accordingly. When the lifting sleeve rises to the corresponding position, the inserting rod is separated from the fixing rod, and the fixation of the fixing rod is released. Tighten the fixing bolt to fix the lifting sleeve, then move the corresponding fixing rod out of the through hole on the fixing frame and re-insert it into a new through hole. After the positions of all the balls are adjusted, loosen the fixing bolt. Under the action of gravity, the lifting sleeve descends along the guiding rod. When the lifting sleeve returns to its original position, the fixing rod is fixed again. Finally, tighten the fixing bolt and restore the fixation above the lifting sleeve. By adopting the above method, the positions of a plurality of balls can be quickly adjusted, effectively improving the adjustment efficiency. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 is a schematic structural view of a centralizer for oil well cementing according to the present utility model;

[0017] Figure 2 is a front view of a centralizer for oil well cementing according to the present utility model;

[0018] Figure 3 is a schematic structural view of the positioning mechanism of a centralizer for oil well cementing according to the present utility model;

[0019] Figure 4 is an enlarged schematic structural view of the fixing plate in a centralizer for oil well cementing according to the present utility model;

[0020] Figure 5 is an enlarged schematic structural view of the lifting block in a centralizer for oil well cementing according to the present utility model.

[0021] The description of the reference numerals is as follows:

[0022] 1. Positioning mechanism; 101. Connecting rod; 102. Positioning ring; 2. Rolling mechanism; 201. Fixed frame; 202. Fixed plate; 203. Ball; 204. Fixed rod; 205. Guide rod; 206. Lifting sleeve; 207. Lifting block; 208. Lifting plate; 209. Insertion rod; 210. Fixed bolt; 3. Reinforcement mechanism; 301. Threaded ring; 302. Threaded rod; 303. Knob. Detailed implementation manners

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0025] The present utility model will be further described below with reference to the drawings:

[0026] As Figures 1 - 5 shown, a centralizer for oil well cementing includes a positioning mechanism 1 for positioning the casing, and further includes a rolling mechanism 2 for reducing the friction between the device and the well wall, and the rolling mechanism 2 is installed outside the positioning mechanism 1.

[0027] In the present utility model, the positioning mechanism 1 includes a connecting rod 101 and a positioning ring 102. The positioning ring 102 is fixed above and below the connecting rod 101. The number of connecting rods 101 is four, and the positioning ring 102 is welded to the connecting rod 101. After the device is installed, the casing can be inserted into the positioning ring 102, so that the casing is just located at the center position of the drilling.

[0028] In the present utility model, the rolling mechanism 2 includes a fixing frame 201, a fixing plate 202, a ball 203, a fixing rod 204, a guiding rod 205, a lifting sleeve 206, a lifting block 207, a lifting plate 208, an inserting rod 209, and a fixing bolt 210. The fixing rod 204 is arranged inside the fixing frame 201. The fixing plate 202 is installed at one end of the fixing rod 204. The ball 203 is installed on the fixing plate 202. The guiding rod 205 is installed on the fixing frame 201. The lifting sleeve 206 is arranged outside the guiding rod 205. The lifting block 207 is fixed to the lifting sleeve 206. The lifting plate 208 is fixed to the lifting block 207. The inserting rod 209 is fixed below the lifting plate 208. The fixing bolt 210 is installed inside the lifting sleeve 206. The lifting sleeve 206 is slidably connected to the guiding rod 205, and the inserting rod 209 is welded to the lifting plate 208. When the positions of multiple balls 203 need to be adjusted, release the fixation above the lifting sleeve 206 and loosen the fixing bolt 210, drive the lifting sleeve 206 to rise along the guiding rod 205. The lifting block 207, the lifting plate 208, and the inserting rod 209 will rise accordingly. When the lifting sleeve 206 rises to the corresponding position, the inserting rod 209 is separated from the fixing rod 204, and the fixation of the fixing rod 204 is released. Tighten the fixing bolt 210 to fix the lifting sleeve 206, then remove the corresponding fixing rod 204 from the through hole on the fixing frame 201 and re-insert it into a new through hole. After the positions of multiple balls 203 are all adjusted, loosen the fixing bolt 210. Under the action of gravity, the lifting sleeve 206 descends along the guiding rod 205. When the lifting sleeve 206 returns to its original position, the fixing rod 204 is fixed again. Finally, tighten the fixing bolt 210 and restore the fixation above the lifting sleeve 206 again. By using the above method, the positions of multiple balls 203 can be adjusted quickly, effectively improving the adjustment efficiency.

[0029] In the present utility model, a strengthening mechanism 3 is installed on the rolling mechanism 2. The strengthening mechanism 3 includes a threaded ring 301, a threaded rod 302, and a knob 303. The threaded rod 302 is installed inside the threaded ring 301, and the knob 303 is fixed above the threaded rod 302. The knob 303 is welded to the threaded rod 302, and the material of the knob 303 is stainless steel. The threaded ring 301, the threaded rod 302, and the knob 303 cooperate together to strengthen the lifting sleeve 206, thus further improving the stability of the lifting sleeve 206.

[0030] In the above structure: When it is necessary to adjust the positions of multiple balls 203, rotate the knob 303 forward. The knob 303 drives the threaded rod 302 to rotate. The rotating threaded rod 302 rises under the action of the threaded ring 301. When the threaded rod 302 rises to the corresponding position, loosen the knob 303. The fixation above the lifting sleeve 206 is released. Loosen the fixing bolt 210 and drive the lifting sleeve 206 to rise along the guide rod 205. The lifting block 207, the lifting plate 208 and the insertion rod 209 rise accordingly. When the lifting sleeve 206 rises to the corresponding position, the insertion rod 209 separates from the fixed rod 204, and the fixation of the fixed rod 204 is released. Tighten the fixing bolt 210 to fix the lifting sleeve 206. Then move the corresponding fixed rod 204 out of the through hole in the fixing frame 201 and re-insert it into a new through hole. After the positions of multiple balls 203 are all adjusted, loosen the fixing bolt 210. The lifting sleeve 206 descends along the guide rod 205 under the action of gravity. When the lifting sleeve 206 returns to its original position, the fixed rod 204 is fixed again. Finally, tighten the fixing bolt 210 and restore the fixation above the lifting sleeve 206 again. After the positions of the balls 203 are adjusted, install the device at the wellhead. After the device is installed, insert the casing into the positioning ring 102. After the casing is installed, grout can be injected into the drilling.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A straightening device for oil well cementing, comprising a positioning mechanism (1) for positioning a casing, characterized in that: It also includes a rolling mechanism (2) for reducing the friction between the device and the well wall, wherein the rolling mechanism (2) is installed outside the positioning mechanism (1); The rolling mechanism (2) comprises a fixing frame (201), a fixing rod (204) is arranged on the inner side of the fixing frame (201), a fixing plate (202) is mounted on one end of the fixing rod (204), a ball (203) is mounted on the fixing plate (202), a fixing component is mounted on the fixing frame (201), the fixing component comprises a guide rod (205), a lifting sleeve (206) is arranged on the outer side of the guide rod (205), a lifting block (207) is fixed on the lifting sleeve (206), a lifting plate (208) is fixed on the lifting block (207), an insert rod (209) is fixed below the lifting plate (208), and a fixing bolt (210) is mounted on the inner side of the lifting sleeve (206).

2. The oil well cementing straightening device according to claim 1, characterized in that: The positioning mechanism (1) comprises a connecting rod (101), and a positioning ring (102) is fixed above and below the connecting rod (101).

3. The oil well cementing straightening device according to claim 2, characterized in that: A reinforcement mechanism (3) is installed on the rolling mechanism (2), and the reinforcement mechanism (3) comprises a threaded ring (301), a threaded rod (302) is installed inside the threaded ring (301), and a knob (303) is fixed above the threaded rod (302).

4. The oil well cementing straightening device according to claim 2, characterized in that: The number of the connecting rods (101) is four, and the positioning ring (102) is welded to the connecting rods (101).

5. The oil well cementing straightening device according to claim 1, characterized in that: The lifting sleeve (206) is slidably connected to the guide rod (205), and the insertion rod (209) is welded to the lifting plate (208).

6. The oil well cementing straightening device according to claim 3, characterized in that: The knob (303) is welded to the threaded rod (302), and the knob (303) is made of stainless steel.

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