Non-pulling-out large-displacement borehole cleaning drilling tool for extended reach well

Abstract

The utility model belongs to the technical field of well drilling tools, and discloses a non-pulling-out large-displacement well hole cleaning drilling tool for a large-displacement well, which comprises a drilling rod main body, a plurality of cleaning holes are formed in the drilling rod main body, and a bypass valve assembly used for controlling drilling fluid to be discharged through the cleaning holes or the bottom end of the drilling rod main body is arranged in the drilling rod main body. Drilling fluid can be controlled to be discharged through the cleaning hole or the bottom end of the drilling rod body by arranging the bypass valve assembly in the drilling rod body, when the drilling fluid displacement needs to be increased to clean a borehole, the bypass valve assembly is opened to enable the drilling rod body to be short-circuited, then the drilling fluid is directly discharged through the cleaning hole, and the drilling fluid displacement for well washing is increased; on one hand, the purpose of efficiently cleaning a well hole is achieved, on the other hand, the bypass valve assembly can be repeatedly used, the bypass valve assembly is closed after well washing is completed, and drilling can be continued.

Description

Technical Field

[0001] This utility model relates to the field of drilling tools technology, specifically a large-displacement wellbore cleaning tool for extended reach wells that does not require drilling. Background Technology

[0002] During drilling, the drilling tools typically consist of drill pipe, power drill string, and drill bit. Drilling fluid is ejected from the drill bit through the drilling tools, carrying drill cuttings back to the surface to clean the wellbore. In extended reach wells, cuttings are primarily transported by tumbling. Because the gravitational component of the annular return velocity decreases with increasing well inclination, the drilling fluid's cuttings-carrying capacity is significantly reduced, causing cuttings to deposit on the lower wellbore in the annulus, easily forming cuttings beds. Furthermore, the drilling fluid experiences significant pressure loss within the power drill string, further reducing its cleaning effect and increasing the risk of stuck pipe accidents. The usual solution is to trip the drill string, remove the power drill string, and run it back down to increase the drilling fluid flow rate to clean the wellbore, a time-consuming and labor-intensive process. Utility Model Content

[0003] The purpose of this invention is to provide a large-displacement wellbore cleaning tool for extended reach wells that does not require drilling, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a large-displacement well cleaning tool for high-capacity wells without drilling, comprising a drill pipe body, wherein a plurality of cleaning holes are provided on the drill pipe body, and a bypass valve assembly for controlling the discharge of drilling fluid through the cleaning holes or the bottom end of the drill pipe body is provided inside the drill pipe body.

[0005] Preferably, the bypass valve assembly includes a sleeve with several outlet holes corresponding to the cleaning holes. A conveying sleeve is fitted inside the sleeve with several flow-limiting holes. An annular groove is formed on the inner circumferential surface of the sleeve, and several drainage pipes are formed on the top of the inner wall of the annular groove. An adjusting element is provided inside the sleeve, and the conveying sleeve is moved up and down by the adjusting element so that the flow-limiting holes are connected to the outlet holes or drainage pipes respectively.

[0006] Preferably, the adjusting component includes an upper sleeve, which is slidably connected to a fixed sleeve via multiple sliders. The fixed sleeve is fixedly connected to the upper sleeve. A lower sleeve is inserted into the fixed sleeve via three slots. The lower sleeve is provided with three limiting plates corresponding to the slots. The bottom end of the fixed sleeve is provided with a Z-shaped guide groove for guiding the limiting plates. The bottom end of the lower sleeve is provided with a fixing ring. The bottom of the inner circumference of the sleeve is provided with a connecting ring. Multiple elastic posts are provided between the connecting ring and the fixing ring. The bottom of the inner circumference of the conveying sleeve is provided with a limiting ring, on which a ball is placed.

[0007] Preferably, the top of the limiting plate has an acute angle structure, and the bottom of the upper sleeve is provided with a plurality of guide grooves. When the limiting plate is located in the slot, the top of the acute angle structure on the limiting plate corresponds to the inclined side of the groove.

[0008] Preferably, the drill pipe body is composed of multiple tubular components connected end-to-end by threads.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] By installing a bypass valve assembly inside the drill pipe body, the drilling fluid pressure can be used to control the discharge of drilling fluid through the cleaning hole or the bottom of the drill pipe body. When it is necessary to increase the drilling fluid discharge rate to clean the wellbore, the bypass valve assembly is opened to short-circuit the drill pipe body, and then the drilling fluid is discharged directly through the cleaning hole, thereby increasing the drilling fluid discharge rate for well washing. This achieves two goals: firstly, to efficiently clean the wellbore; and secondly, the bypass valve assembly can be reused. After well washing is completed, the bypass valve assembly is closed, and drilling can continue. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0013] Figure 3 This is an exploded view of the bypass valve assembly of this utility model;

[0014] Figure 4 This is a structural cross-sectional view of the bypass valve assembly in the well-washing state of this utility model.

[0015] Figure 5 This is a cross-sectional view of the bypass valve assembly in the drilling state of this utility model.

[0016] In the picture:

[0017] 1. Drill pipe body; 2. Cleaning hole; 3. Bypass valve assembly; 301. Sleeve; 302. Liquid outlet hole; 303. Conveying sleeve; 304. Flow limiting hole; 305. Upper sleeve; 306. Slider; 307. Fixed sleeve; 308. Slot; 309. Z-shaped guide groove; 310. Lower sleeve; 311. Guide tooth groove; 312. Limiting plate; 313. Fixing ring; 314. Connecting ring; 315. Elastic column; 316. Ball; 317. Limiting ring; 318. Annular groove; 319. Drainage pipe. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-5 This utility model provides a technical solution:

[0020] like Figure 1 and Figure 2 As shown, a high-displacement wellbore cleaning tool for extended reach wells includes a drill pipe body 1, which is composed of multiple tubular components connected end-to-end by threads. Several cleaning holes 2 are provided on the drill pipe body 1. A bypass valve assembly 3 is installed inside the drill pipe body 1 to control the discharge of drilling fluid through the cleaning holes 2 or the bottom of the drill pipe body 1. The drilling fluid pressure controls the discharge through the cleaning holes 2 or the bottom of the drill pipe body 1. When it is necessary to increase the drilling fluid discharge to clean the wellbore, the bypass valve assembly 3 is opened to short-circuit the drill pipe body 1, and then the drilling fluid is directly discharged through the cleaning holes 2, increasing the drilling fluid discharge for well cleaning. This achieves two goals: firstly, efficient wellbore cleaning; and secondly, the bypass valve assembly 3 is reusable. After well cleaning is completed, the bypass valve assembly 3 is closed, and drilling can continue.

[0021] like Figure 3 As shown, the bypass valve assembly 3 includes a sleeve 301, on which several outlet holes 302 corresponding to the cleaning holes 2 are opened. A conveying sleeve 303 is sleeved inside the sleeve 301, on which several flow-limiting holes 304 are opened. The flow-limiting holes 304 are respectively connected to the several outlet holes 302. An annular groove 318 is opened on the inner circumferential surface of the sleeve 301. Several drainage pipes 319 are opened on the top of the inner wall of the annular groove 318. The bottom end of the several drainage pipes 319 is connected to the channel in the drill rod body 1. An adjusting component is provided inside the sleeve 301. The conveying sleeve 303 is moved up and down by the adjusting component, so that the flow-limiting holes 304 are respectively connected to the outlet holes 302 or the drainage pipes 319.

[0022] Specifically, such as Figure 5 As shown, the flow-limiting hole 304 is located at the bottom of the delivery sleeve 303. When the drill pipe body 1 is drilling, the upper part of the delivery sleeve 303 blocks the liquid outlet hole 302 on the sleeve 301. The drilling fluid enters the annular groove 318 through the flow-limiting hole 304 on the delivery sleeve 303, and then enters the drill pipe body 1 again through the discharge pipe 319. Finally, it is discharged through the drill bit at the bottom of the drill pipe body 1.

[0023] like Figure 4As shown, when it is necessary to increase the drilling fluid discharge rate to clean the wellbore, the flow restriction hole 304 on the delivery sleeve 303 coincides with the outlet hole 302 on the sleeve 301. When the drilling fluid enters the delivery sleeve 303, it enters the outlet hole 302 through the flow restriction hole 304 and is finally discharged directly through the cleaning hole 2, thereby increasing the drilling fluid discharge rate for well washing and achieving the purpose of efficiently cleaning the wellbore.

[0024] Furthermore, in order to control the up-and-down movement of the delivery sleeve 303 by utilizing the pressure of the drilling fluid, the adjusting component includes an upper sleeve 305. The upper sleeve 305 is slidably connected to a fixed sleeve 307 via multiple sliders 306. The fixed sleeve 307 is fixedly connected to the sleeve 301. The fixed sleeve 307 is inserted into a lower sleeve 310 via three slots 308. The lower sleeve 310 is provided with three limiting plates 312 corresponding to the slots 308. The bottom end of the fixed sleeve 307 is provided with a Z-shaped guide groove 309 for guiding the limiting plates 312. The bottom end of the lower sleeve 310 is provided with a fixing ring 313. The bottom of the inner circumferential surface of the sleeve 301 is provided with a connecting ring 314. Multiple elastic pillars 315 are provided between the connecting ring 314 and the fixing ring 313. The bottom of the inner circumferential surface of the delivery sleeve 303 is provided with a limiting ring 317, on which a ball 316 is placed.

[0025] Furthermore, the top of the limiting plate 312 has an acute angle structure, and the bottom of the upper sleeve 305 is provided with several guide grooves 311. When the limiting plate 312 is located in the slot 308, the top of the acute angle structure on the limiting plate 312 corresponds to the inclined side of the groove 311.

[0026] Specifically, during normal drilling without the need for well washing, the drilling fluid sequentially passes through the drill pipe body 1, sleeve 301, delivery sleeve 303, upper sleeve 305, lower sleeve 310, flow restrictor 304, annular groove 318, and discharge pipe 319, ultimately exiting through the bottom of the drill pipe body 1. This ensures the maximum flow rate of the drilling fluid. When well washing is required, a ball 316 is inserted into the drill pipe body 1. Guided by the drill pipe body 1 and sleeve 301, the ball 316 lands on the limiting ring 317 within the delivery sleeve 303. Then, the pump is turned on to deliver the drilling fluid. The fluid applies pressure to the ball 316, causing the delivery sleeve 303 to push the lower sleeve 310 downward. Guided by the toothed groove 311, the top of the limiting plate 312 passes over the bottom of the Z-shaped guide groove 309, and under the elastic force of the elastic column 315, the limiting plate 312 is inserted into the slot 308. At this time, the flow limiting hole 304 on the delivery sleeve 303 coincides with the liquid outlet hole 302 on the sleeve 301. When the drilling fluid enters the delivery sleeve 303, it enters the liquid outlet hole 302 through the flow limiting hole 304 and is finally discharged directly through the cleaning hole 2, thereby increasing the drilling fluid discharge rate for well washing and achieving the purpose of efficient well cleaning.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-displacement wellbore cleaning tool for extended reach wells, comprising a drill pipe body (1), characterized in that, The drill pipe body (1) is provided with several cleaning holes (2), and a bypass valve assembly (3) is provided inside the drill pipe body (1) to control the drilling fluid to be discharged through the cleaning holes (2) or the bottom of the drill pipe body (1); The bypass valve assembly (3) includes a sleeve (301), on which a plurality of outlet holes (302) corresponding to the cleaning hole (2) are provided. A conveying sleeve (303) is sleeved inside the sleeve (301), on which a plurality of flow-limiting holes (304) are provided. An annular groove (318) is provided on the inner circumferential surface of the sleeve (301), and a plurality of drainage pipes (319) are provided on the top of the inner wall of the annular groove (318). An adjusting member is provided inside the sleeve (301), and the conveying sleeve (303) is moved up and down by the adjusting member so that the flow-limiting holes (304) are connected to the outlet holes (302) or the drainage pipes (319) respectively.

2. The drilling tool for cleaning large-displacement wells without drilling out of a large-displacement well, as described in claim 1, is characterized in that... The adjusting component includes an upper sleeve (305), which is slidably connected to a fixed sleeve (307) via multiple sliders (306). The fixed sleeve (307) is fixedly connected to the sleeve (301). A lower sleeve (310) is inserted into the fixed sleeve (307) via three slots (308). The lower sleeve (310) is provided with three limiting plates (312) corresponding to the slots (308). The bottom end of the fixed sleeve (307) has an opening. A Z-shaped guide groove (309) is used to guide the limiting plate (312). A fixing ring (313) is provided at the bottom end of the lower sleeve (310). A connecting ring (314) is provided at the bottom of the inner circumferential surface of the sleeve (301). A plurality of elastic columns (315) are provided between the connecting ring (314) and the fixing ring (313). A limiting ring (317) is provided at the bottom of the inner circumferential surface of the conveying sleeve (303). A ball (316) is placed on the limiting ring (317).

3. The drilling tool for cleaning large-displacement wells without drilling out of a large-displacement well, as described in claim 2, is characterized in that... The top of the limiting plate (312) has an acute angle structure, and the bottom of the upper sleeve (305) is provided with several guide grooves (311). When the limiting plate (312) is located in the slot (308), the top of the acute angle structure on the limiting plate (312) corresponds to the inclined side of the groove (311).

4. The drilling tool for cleaning large-displacement wells without drilling out of a large-displacement well, as described in claim 1, is characterized in that... The drill pipe body (1) is made up of multiple tubular parts connected by threads at both ends.

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