Detachable multifunctional pilot milling shoe

Abstract

The utility model relates to a detachable multifunctional pilot milling shoe which comprises a milling shoe body and a detachable pilot guide cone, the upper end of the milling shoe body is provided with internal threads used for being connected with a drill collar or a drill rod, the lower end of the milling shoe body is in threaded connection with the detachable pilot guide cone, and a through water hole is formed in the axis from the milling shoe body to the detachable pilot guide cone. According to the detachable multifunctional pilot milling shoe provided by the utility model, fishes in a moving state in a well can be limited and fixed by utilizing the assembled detachable pilot guide cones with different specifications, then the fishes are ground by the wear-resistant material laid on the plane of the lower end of the milling shoe body along with rotation of a drilling tool, and ground scrap iron is brought to the ground through a circulating system, so that the fishes are ground, and the working efficiency is improved. And the milling of the falling fish in an active state is realized. And meanwhile, the steel balls which are uniformly designed and distributed on the outer wall of the milling shoe body play a role in centralizing and friction reducing in the milling process, so that fault accidents that a milling tool is eccentrically worn to damage a sleeve and iron chips are accumulated to block a drill are effectively prevented, and convenience is brought to treatment of underground fallen objects.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and water well milling operations in oil and gas fields, and more specifically to a detachable multifunctional eyelet milling shoe. Background Art

[0002] The pilot shoe is an important technical means for milling free-falling objects in oil and water wells, especially for objects that are difficult to salvage, such as sand control packers, stuck drill pipes, drill collars, etc. Since the fish is long and the pipe string swings greatly, the use of flat-bottomed mills, concave mills, and hollow mills will lead to slow milling footage, eccentric grinding and drilling, casing damage or window opening due to excessive pipe string swing. The treatment effect on active fish is not good, the operability is low, and the success rate is not high. When using pilot shoes, the guide cone cannot be removed, and the pilot milling needs to be frequently processed due to different sizes of fish, resulting in discontinuous construction, increased tool processing costs, and a long wellbore processing cycle. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a detachable multifunctional eyelet grinding shoe, which can greatly improve the safety and success rate of operations and shorten the well occupation period.

[0004] The technical solution adopted by the utility model to solve its technical problems is: constructing a detachable multifunctional pilot eye grinding shoe, comprising a grinding shoe body and a detachable pilot eye guide cone, the upper end of the grinding shoe body is provided with an internal thread for connecting with a drill collar or a drill rod, the lower end of the grinding shoe body is threadedly connected with the detachable pilot eye guide cone, and a penetrating water hole is provided on the axis from the grinding shoe body to the detachable pilot eye guide cone.

[0005] In the above scheme, the water eye is of straight-through type or bypass type.

[0006] In the above scheme, inner holes are evenly distributed on the outer wall of the grinding shoe body, steel balls are embedded in the inner holes, and the diameter of the circumscribed circle formed by the steel balls is larger than the outer diameter of the grinding shoe body.

[0007] In the above solution, the lower end plane of the grinding shoe body is paved with wear-resistant material.

[0008] In the above scheme, an internal thread for connecting with the detachable pilot eye and guide cone thread is provided at the middle part of the lower end of the grinding shoe body.

[0009] The utility model also provides a milling method using the detachable multifunctional eyelet milling shoe, which is used to complete the free-fall milling of oil and water wells, and includes the following steps:

[0010] 1) Select the corresponding size of the removable multifunctional pilot eye grinding shoe according to the inner diameter of the casing and the specifications of the fish drop, including the outer diameter of the grinding shoe body, the outer diameter of the removable pilot eye guide cone, and the size of the water eye;

[0011] 2) Lower the removable multifunctional pilot shoe into the well along with the drilling tool;

[0012] 3) Go down to 3-5m above the fish and start the pump with high displacement and positive circulation to wash the well;

[0013] 4) After the return flow from the wellhead is stable, start the turntable and slowly lower the drilling tool for milling construction;

[0014] 5) Mill 3-5m and lift and lower the movable pipe column once;

[0015] 6) After milling, wash the well with large displacement circulation to clean the debris in the well;

[0016] 7) Remove the milling pipe column.

[0017] The detachable multifunctional eyelet grinding shoe of the utility model has the following beneficial effects:

[0018] 1. The utility model can use the assembled detachable eyelet guide cones of different specifications to limit and fix the fish in the active state in the well. Then, as the drill bit rotates, the YD alloy or other wear-resistant materials laid on the lower surface of the grinding shoe body grind the fallen objects, and the iron filings ground are brought to the ground through the circulation system, so as to achieve effective grinding of the fish in the active state. At the same time, the steel balls evenly distributed on the outer wall of the grinding shoe body play a role in straightening and reducing friction during the grinding process, effectively preventing the occurrence of accidents such as the grinding tool eccentrically wearing and damaging the casing, and the accumulation of iron filings and jamming the drill, which brings convenience to the treatment of the fallen objects in the well.

[0019] 2. The guide cones of different sizes can be replaced according to the inner diameter of the fish cavity, so that one grinding shoe can be used for fish of various specifications, saving tool processing and manufacturing costs. In special circumstances, the guide cone can be removed and used directly as a grinding shoe, saving the tool preparation cycle. The milling method of the utility model is simple to operate and has good milling effect, and can more effectively complete the milling construction of free-falling objects in oil and water wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0021] Figure 1 It is a structural schematic diagram of the utility model of a detachable multifunctional eyelet grinding shoe;

[0022] Figure 2 It is a structural schematic diagram of a detachable multifunctional eyelet grinding shoe body;

[0023] Figure 3 for Figure 2 AA section diagram in;

[0024] Figure 4 for Figure 2 BB cross-section diagram in FIG.

[0025] Figure 5 for Figure 2 Schematic diagram of the CC cross section. DETAILED DESCRIPTION

[0026] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0027] like Figure 1-5 As shown, the utility model detachable multifunctional pilot eye grinding shoe comprises a grinding shoe body 2 and a detachable pilot eye guide cone 4. The upper end of the grinding shoe body is a drill rod internal thread 1, which is used to connect with a drill collar, a drill rod, etc.

[0028] A water hole is provided on the axis of the detachable multifunctional pilot eye grinding shoe from the grinding shoe body 2 to the detachable pilot eye guide cone 4. The water hole can be designed as a straight-through type or a bypass type according to the well conditions. The surface pumped workover fluid is throttled at the water hole to form a pressure difference. The detachable pilot eye guide cone 4 guides the high-impact water flow to impact the top of the fish, and the fish is milled in coordination with the rotation of the pipe string, which greatly improves the milling efficiency.

[0029] There are inner holes evenly distributed on the outer wall of the grinding shoe body 2, and there are steel balls 5 in the holes. The diameter of the circumscribed circle formed by the steel balls 5 is larger than the outer diameter of the grinding shoe body 2. The steel balls 5 play a role in straightening and reducing friction during the grinding and milling process, effectively preventing the grinding and milling tool from damaging the casing due to eccentric grinding, and preventing iron chips from accumulating and jamming the drill.

[0030] The lower surface of the grinding shoe body 2 is paved with YD alloy or other wear-resistant materials 3, and the middle of the lower end is provided with an internal thread, which is threadedly connected with the detachable pilot cone 4. The threaded connection changes the previous welding form, so that the pilot grinding shoe can be connected with a suitable guide cone according to the specifications of the fish in the well, which improves the utilization rate of the tool, reduces the production cost, increases the continuity of construction, and saves the time and expenditure of processing tools.

[0031] The detachable pilot cone 4 can be replaced according to the inner diameter size of the objects in the well to adapt to objects of different sizes. In special circumstances, the pilot cone can be removed and the detachable multifunctional pilot grinding shoe can be used as a hollow grinding shoe or a high-efficiency multi-blade grinding shoe, thereby improving the utilization rate of the tool.

[0032] The utility model also provides a milling method using a detachable multifunctional eyelet milling shoe, which is used to complete the free-fall milling of oil and water wells, and includes the following steps:

[0033] 1) Select the corresponding size of the removable multifunctional pilot eye grinding shoe according to the inner diameter of the casing and the specifications of the fish drop, including the outer diameter of the grinding shoe body, the outer diameter of the removable pilot eye guide cone, and the size of the water eye;

[0034] 2) Lower the removable multifunctional pilot shoe into the well along with the drilling tool;

[0035] 3) Go down to 3-5m above the fish and start the pump with high displacement and positive circulation to wash the well;

[0036] 4) After the return flow from the wellhead is stable, start the turntable and slowly lower the drilling tool for milling construction;

[0037] 5) Mill 3-5m and lift and lower the movable pipe column once;

[0038] 6) After milling, wash the well with large displacement circulation to clean the debris in the well;

[0039] 7) Remove the milling pipe column.

[0040] The utility model can use the assembled detachable eyelet guide cones of different specifications to limit and fix the fish in the active state in the well. Then, as the drill bit rotates, the YD alloy or other wear-resistant materials laid on the lower end plane of the grinding shoe body grind the fallen objects, and the ground iron filings are brought to the ground through the circulation system to achieve the grinding of the fish in the active state. At the same time, the steel balls evenly distributed on the outer wall of the grinding shoe body play a role in straightening and reducing friction during the grinding process, effectively preventing the occurrence of accidents such as eccentric grinding and damage to the casing of the grinding tool and accumulation of iron filings and jamming of the drill, which brings convenience to the treatment of the fallen objects in the well. The guide cones of different sizes can be replaced according to the inner diameter of the fish cavity, so that one grinding shoe can be used for fish of various specifications, saving the cost of tool processing and manufacturing. In special circumstances, the guide cone can be removed and used directly as a grinding shoe, saving the tool preparation cycle. The grinding method of the utility model is simple to operate and has good grinding effect, and can more effectively complete the grinding construction of free-falling objects in oil and water wells.

[0041] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. A detachable multifunctional eyelet grinding shoe, characterized in that: It includes a mill shoe body and a detachable pilot eye guide cone, the upper end of the mill shoe body is provided with an internal thread for connecting to a drill collar or a drill rod, the lower end of the mill shoe body is threadedly connected to the detachable pilot eye guide cone, a penetrating water hole is provided on the axis from the mill shoe body to the detachable pilot eye guide cone, the water hole is a straight-through type or a bypass type, the outer wall of the mill shoe body is evenly distributed with inner holes, steel balls are embedded in the inner holes, the diameter of the circumscribed circle formed by the steel balls is larger than the outer diameter of the mill shoe body, the lower end plane of the mill shoe body is paved with wear-resistant material, and the middle part of the lower end of the mill shoe body is provided with an internal thread for threading connection with the detachable pilot eye guide cone.

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