A milling and salvaging window opening incline device

Abstract

The present invention is a sleeve milling and salvaging type window opening bevel, comprising a bevel body, a slider salvaging mechanism and a plug, wherein the slider salvaging mechanism comprises a first tube body, wherein at least two first mounting grooves are provided on the inner wall of the first tube body, and a radial hole is provided at the bottom of each first mounting groove. A radially movable block is embedded in each first mounting groove. A conical slider, a second spring and a lower spring seat are sleeved in the first tube body from top to bottom in sequence, wherein an outer conical surface is formed on the upper end of the conical slider, an inner inclined surface matching the outer conical surface is formed on the inner wall of the block, and the lower spring seat is fixed to the first tube body. A first through hole is provided on the side wall of the first tube body, and a first protective cover is sleeved and fixed on the outer side of the first tube body, and the middle part of the conical slider passes through the first through hole and is fixed to the first protective cover. The sleeve milling and salvaging type window opening bevel of the present invention can effectively reduce the risk of easy blockage of the salvaging mechanism and improve the salvaging reliability of the window opening bevel.

Description

Technical Field

[0001] The invention relates to the technical field of drilling tools in the petroleum industry, and in particular to a milling and fishing type window opening whipstock. Background Art

[0002] Multi-branch wells are wells drilled at different depths in a main wellbore to exploit oil layers at different depths. This technology can increase the oil drainage area, increase oil well production, and reduce the cost of reservoir development. Branch well technology is generally considered to be one of the advanced technologies with broad development prospects that uses drilling technology to increase oil and gas well recovery rates, turn difficult-to-use reserves into usable reserves, and further improve the economic benefits of oil and gas wells.

[0003] Opening a window on the main wellbore casing is an important process in branch well operations. The window opening tools mainly include window opening whipstock, window opening milling cone, drilling tools and fishing tools. During the window opening operation, first insert the plug of the window opening whipstock into the positioning tool located in the main wellbore casing and lock it; then lower the window opening milling cone, and under the guidance and support of the inclined body of the window opening whipstock, the window opening milling cone completes the window opening of the main wellbore casing and side-drills to form a pilot branch wellbore; then lower the drilling tool, and under the guidance of the inclined body of the window opening whipstock, send the drilling tool into the pilot branch wellbore to continue drilling and carry out branch wellbore drilling operations; after completing the branch wellbore drilling, use the fishing tool to remove the window opening whipstock from the well to facilitate subsequent construction such as the lowering of the completion tool.

[0004] Among them, using the milling salvage tool to perform milling is an important way to salvage the window opening whipstock. The structure of the commonly used milling salvage tool is as follows: Figure 1 As shown, it includes a salvage pipe body 01 and a sleeve milling head 02 connected to the lower end of the salvage pipe body 01. A shoulder 011 with a reduced diameter is formed downward on the inner wall of the lower end of the salvage pipe body 01. During sleeve milling, the sleeve milling head 02 can be used to grind off the corresponding parts on the window opening whipstock, and the shoulder 011 can be used to clamp the corresponding parts that pop out of the window opening whipstock, thereby achieving salvage. However, during the sleeve milling process, due to the influence of debris sedimentation and accumulation during window opening, drilling or milling, the salvage mechanism on the window opening whipstock often becomes stuck due to blockage, and the debris cannot be effectively flushed out during the flushing operation, so that the corresponding parts cannot be smoothly ejected and are stuck on the shoulder 011 due to being stuck, resulting in the failure of the salvage operation. In addition, during the flushing operation, deeper positions cannot be flushed and the position of the sleeve milling machine is limited. When the debris sedimentation and accumulation are serious, even if the shoulder 011 can clamp the corresponding pop-up parts on the window opening bevel device, it may be stuck due to the serious accumulation of debris at the bottom and cannot be smoothly pulled out.

[0005] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes a milling and salvaging window opening inclinometer to overcome the defects of the prior art. Summary of the invention

[0006] The object of the present invention is to provide a milling and salvaging window opening whipstock, which can effectively reduce the risk of clogging of the salvaging mechanism and improve the salvaging reliability of the window opening whipstock.

[0007] The object of the present invention is achieved in this way. A sleeve milling and salvaging window opening whipstock comprises a bevel body, a slider salvaging mechanism and a plug connected in sequence from top to bottom; the slider salvaging mechanism comprises a first vertically arranged tube body, the inner wall of the first tube body is provided with at least two first mounting grooves evenly spaced along its circumference, and the bottom of each first mounting groove is provided with a radial hole; a radially movable clamping block is embedded in each first mounting groove, a first spring is sandwiched between the outer walls at both ends of the clamping block and the bottom of the first mounting groove, and the middle part of the clamping block is passed through the radial hole; in the first tube body and located A conical slider, a second spring and a lower spring seat are sequentially sleeved below the clamping block from top to bottom, an outer conical surface is formed on the upper end of the conical slider, an inner inclined surface matching the outer conical surface is formed on the inner wall of the clamping block and abuts against the outer conical surface, and the lower spring seat is fixed to the first tube body; a first through hole is opened on the side wall of the first tube body and below the first mounting groove, a first protective cover is sleeved and fixed on the outer side of the first tube body, two ends of the first protective cover are respectively located above the first mounting groove and below the first through hole, and the middle part of the conical slider passes through the first through hole and is fixed to the first protective cover.

[0008] In a preferred embodiment of the present invention, each block includes a first block and a second block extending outward from the middle of the outer side of the first block, and the axial length of the second block along the first tube body is smaller than the axial length of the first block; a first spring is respectively sandwiched between the outer side of the upper end and the outer side of the lower end of the first block and the bottom of the first mounting groove, the second block is inserted into the radial hole, and an inner bevel is formed on the inner wall of the first block.

[0009] In a preferred embodiment of the present invention, at least two second through holes are spaced apart along the circumference of the side wall of the first tube body, a first retaining ring is fixed at each second through hole, the first retaining ring and the second through hole constitute a first mounting groove, and the inner ring portion of the first retaining ring constitutes a radial hole.

[0010] In a preferred embodiment of the present invention, the conical slider includes a conical block, a limit block and an upper spring seat which are arranged in sequence from top to bottom, an outer conical surface is formed on the upper outer wall of the conical block, the limit block passes through the first through hole and is fixed to the first protective cover, and the lower end surface of the limit block can abut against the lower side hole wall of the first through hole, and the two ends of the second spring respectively abut against the upper spring seat and the lower spring seat.

[0011] In a preferred embodiment of the present invention, a groove connected to the first through hole is provided on the side wall of the first tube body and below the first through hole, and the lower end of the limit block extends downward to form a convex plate, which is inserted into the groove and fixedly connected to the first protective cover.

[0012] In a preferred embodiment of the present invention, the limit block is fixedly connected to the first protective cover by a first screw, and the upper end and the lower end of the first protective cover are fixedly connected to the first tube body by a second screw.

[0013] In a preferred embodiment of the present invention, an annular groove is formed on the inner wall of the lower end of the first tube body, a retaining ring is embedded in the annular groove, and the lower end of the lower spring seat abuts against the retaining ring.

[0014] In a preferred embodiment of the present invention, an anti-chip leather cup is sleeved between the slider salvaging mechanism and the plug, and the opening of the anti-chip leather cup is arranged upward.

[0015] In a preferred embodiment of the present invention, a redundant salvage mechanism is also connected between the slider salvage mechanism and the plug, and the redundant salvage mechanism includes a second tube body, and an anti-chip leather cup is sleeved on the outer side of the upper end of the second tube body; at least two second mounting grooves are arranged on the outer wall of the second tube body and below the anti-chip leather bowl at intervals along its circumference, and a radially movable spring block is embedded in each second mounting groove, and a third spring is clamped between the spring block and the second mounting groove; a second protective cover is sleeved and fixed on the outer side of the second tube body and at a position corresponding to the second mounting groove, and the outer side of the spring block can abut against the second protective cover.

[0016] In a preferred embodiment of the present invention, the spring block includes a first spring block and a second spring block extending outward from the middle part of the outer side of the first spring block, and the axial length of the second spring block along the second tube body is smaller than the axial length of the first spring block; the second mounting groove includes a first stepped hole and a second stepped hole whose apertures decrease successively from the outside to the inside along the radial direction of the second tube body, a second retaining ring is fixed in the first stepped hole, and the second spring block is inserted in the second retaining ring; the outer sides of the upper end and the lower end of the first spring block can abut against the second retaining ring, and the third spring abuts between the first spring block and the bottom of the second mounting groove.

[0017] In a preferred embodiment of the present invention, the second mounting groove also includes a third step hole located on the inner side of the second step hole along the radial direction of the second tube body, and the aperture of the third step hole is smaller than the aperture of the second step hole; an embedding groove is opened on the inner side of the first spring block, and the inner and outer sides of the third spring are respectively embedded in the third step hole and the embedding groove.

[0018] In a preferred embodiment of the present invention, the upper outer side of the first elastic block is an inclined surface, and the lower outer side thereof is a flat surface, and the flat surface can abut against the second protective cover.

[0019] In a preferred embodiment of the present invention, the beveled body includes a columnar body, an outer bevel is formed on the upper side of the columnar body, and a plurality of groups of color straighteners are arranged at intervals along the axial direction of the side wall of the columnar body, each group of color straighteners includes at least one radially protruding color straightening block, and each color straightening block is filled with a colored liquid.

[0020] In a preferred embodiment of the present invention, a receiving groove is opened on the side wall of the columnar body corresponding to the position of each color-developing straightening block, each color-developing straightening block is embedded and fixed in the receiving groove, and the outer side of the color-developing straightening block protrudes from the outer wall of the columnar body, and a storage sealed cavity is formed between the inner side of the color-developing straightening block and the bottom of the receiving groove, and the colored liquid is filled in the storage sealed cavity.

[0021] As described above, the window opening bevel in the present invention is provided with a slider salvage mechanism. After the first protective cover is milled off, since there is basically no gap between the block and the radial hole, the size of the first through hole is relatively large, and the debris can be effectively flushed out during the flushing operation. There is basically no accumulation of debris at these two places and the block will not get stuck. Under the elastic force of the second spring, the cone slider can be pushed upward, and the block can be effectively ejected through the cooperation of the outer conical surface of the cone slider and the inner inclined surface of the block, ensuring that the shoulder can effectively clamp the block when the sleeve milling salvage tool is lifted. Therefore, by utilizing the cooperation of the cone slider, the second spring and the block, the ejection of the block can be effectively ensured by pushing the block through the cone slider, effectively reducing the risk of easy blockage of the slider salvage mechanism, and improving the reliability of the window opening bevel salvage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0023] Figure 1 : It is a structural diagram of a sleeve milling salvage tool in the prior art.

[0024] Figure 2 : A schematic structural diagram of the milling and salvaging type window opening incline provided by the present invention.

[0025] Figure 3 : A schematic structural diagram of the slider salvage mechanism provided by the present invention.

[0026] Figure 4 : A schematic structural diagram of the first tube body provided by the present invention.

[0027] Figure 5 : A schematic diagram of the structure of the card block provided by the present invention.

[0028] Figure 6 : A schematic structural diagram of the redundant salvage mechanism provided by the present invention.

[0029] Figure 7 : A schematic diagram of the structure of the bullet block provided by the present invention.

[0030] Figure 8 : A schematic structural diagram of the color developing and straightening block provided by the present invention.

[0031] Description of Figure Numbers:

[0032] 01. Salvage the pipe body; 011. Shoulder clamping; 02. Milling head;

[0033] 1. Inclined body;

[0034] 2. Color developing straightener; 21. Color developing straightening block; 211. Storage tank;

[0035] 3. Slider salvage mechanism;

[0036] 31, first tube body; 311, first mounting groove; 3111, radial hole; 312, first through hole; 313, first retaining ring; 314, groove; 315, ring groove;

[0037] 32, card block; 321, first card block; 322, second card block; 323, slot;

[0038] 33. First spring;

[0039] 34, cone slider; 341, cone block; 342, limit block; 3421, convex plate; 343, upper spring seat;

[0040] 35. Second spring;

[0041] 36. Lower spring seat;

[0042] 37, first protective cover; 371, first screw; 372, second screw;

[0043] 38. retaining ring;

[0044] 4. Anti-chip leather bowl;

[0045] 5. Redundant salvage mechanism;

[0046] 51. second tube body; 511. second mounting groove; 512. second retaining ring;

[0047] 52, spring block; 521, first spring block; 522, second spring block; 523, embedded groove;

[0048] 53. Third spring;

[0049] 54, second protective cover; 541, third screw;

[0050] 6. Plug. DETAILED DESCRIPTION

[0051] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0052] like Figures 2 to 8 As shown, this embodiment provides a milling and salvaging type window opening incline device, including an inclined surface body 1, a slider salvaging mechanism 3 and a plug 6 connected in sequence from top to bottom.

[0053] The slider salvage mechanism 3 includes a first tube body 31 arranged vertically, and at least two first mounting grooves 311 are evenly spaced along the circumference of the inner wall of the first tube body 31, and a radial hole 3111 is formed at the bottom of each first mounting groove 311. A radially movable block 32 is embedded in each first mounting groove 311, and a first spring 33 is sandwiched between the outer walls at both ends of the block 32 and the bottom of the first mounting groove 311, and the middle of the block 32 is penetrated in the radial hole 3111. A cone slider 34, a second spring 35 and a lower spring seat 36 are sequentially sleeved from top to bottom in the first tube body 31 and below the block 32, and an outer conical surface is formed at the upper end of the cone slider 34, and an inner inclined surface matching the outer conical surface is formed on the inner wall of the block 32, and abuts against the outer conical surface, and the lower spring seat 36 is fixed to the first tube body 31. A first through hole 312 is provided on the side wall of the first tube body 31 and below the first mounting groove 311. A first protective sleeve 37 is fixedly mounted on the outer side of the first tube body 31. Two ends of the first protective sleeve 37 are respectively located above the first mounting groove 311 and below the first through hole 312. The middle part of the conical slider 34 passes through the first through hole 312 and is fixed to the first protective sleeve 37.

[0054] Specifically, the upper end of the first tube body 31 can be Figure 3 and Figure 4 The structure shown in the figure is a solid structure, but it can also be a hollow structure. The number of the first mounting grooves 311 is determined according to the needs. For example, in this embodiment, two first mounting grooves 311 are symmetrically provided. The cross-sectional shape of the middle part of the block 32 along the radial direction of the first tube body 31 matches the shape of the radial hole 3111, and there is basically no gap between the two. The above-mentioned first through hole 312 is mainly to facilitate the fixation of the cone slider 34 and the first protective cover 37. Generally, only one first through hole 312 is provided, and other numbers can also be provided according to the needs. This embodiment is only for illustration. The size of the entire slider salvage mechanism 3 can be made larger, and the size of the first through hole 312 can also be made larger, so that the debris can be basically flushed out during the flushing operation.

[0055] When in use, the window opening bevel is lowered into the designated position in the well and its plug 6 is inserted and fixed on the positioning tool located in the main wellbore casing and locked. Generally, a retaining spring is provided on the plug 6, which can be fixed in the slot of the positioning tool to achieve locking. The structure of the plug 6 and the positioning tool and the locking of the two are prior art and will not be described in detail here. After that, the window opening milling cone is lowered first, and then the drilling tool is lowered. The window opening milling cone and the drilling tool can be lowered to the position of the inclined surface body 1 respectively, and the outer inclined surface of the inclined surface body 1 is used to provide lateral force for the window opening milling cone or the drilling tool, so as to successively form a pilot branch wellbore and a branch wellbore. After completing the drilling of the branch wellbore, use Figure 1 The milling and salvaging tool shown in the figure is used to salvage the window whipstock. The structure of the milling and salvaging tool is the prior art. Generally, the inner diameter of the milling head 02 is required to be slightly larger than the outer diameter of the first tube body 31 and smaller than the outer diameter of the first protective cover 37. The outer diameter of the milling head 02 is slightly smaller than the inner diameter of the casing.

[0056] Before salvaging, one end of the first spring 33 rests on the bottom of the first mounting groove 311, and the other end rests on the outer sides of the two ends of the block 32, so as to press the block 32 against the cone slider 34, so that the block 32 is in a retracted state. When salvaging, the entire sleeve milling salvage tool is sleeved on the outer side of the window opening bevel and lowered downward. Since some debris will be generated during sleeve milling, the sleeve milling salvage tool will be lowered while flushing when in use. When it is lowered to the position of the slider salvage mechanism 3, after the sleeve milling head 02 mills off the first protective cover 37, the middle part of the cone slider 34 is released from the fixation with the first protective cover 37, and the cone slider 34 moves upward under the action of the second spring 35. Under the action of the outer conical surface, the block 32 will be pushed out to overcome the pressure of the first spring 33, so that the sleeve milling salvage tool can clamp the block 32 when it is lifted, and then pull out the window opening bevel, so as to achieve smooth salvage.

[0057] Therefore, the window opening whipstock in this embodiment is provided with a slider salvage mechanism 3. After the first protective cover 37 is milled off, since there is basically no gap between the block 32 and the radial hole 3111, the size of the first through hole 312 is relatively large, and the debris can be effectively flushed out during the flushing operation, and the debris will basically not accumulate at these two places and become stuck; under the elastic force of the second spring 35, the cone slider 34 can be pushed upward, and the block 32 can be effectively ejected through the cooperation of the outer conical surface of the cone slider 34 and the inner inclined surface of the block 32, ensuring that the shoulder 011 of the sleeve milling salvage tool can effectively clamp the block 32 when it is lifted. Therefore, by utilizing the cooperation of the cone slider 34, the second spring 35 and the block 32, the ejection of the block 32 can be effectively ensured by pushing the block 32 through the cone slider 34, effectively reducing the risk of easy blocking of the slider salvage mechanism 3, and improving the reliability of the window opening whipstock.

[0058] In a specific implementation, in order to facilitate the processing and installation of the card block 32, as shown in FIG. Figures 3 to 5 As shown, each block 32 includes a first block 321 and a second block 322 extending outward from the middle of the outer side of the first block 321. The axial length of the second block 322 along the first tube body 31 is less than the axial length of the first block 321. A first spring 33 is respectively sandwiched between the outer side of the upper end and the outer side of the lower end of the first block 321 and the bottom of the first mounting groove 311. The second block 322 is inserted into the radial hole 3111, and an inner bevel is formed on the inner wall of the first block 321. At least two second through holes are spaced apart along the circumference of the side wall of the first tube body 31. A first retaining ring 313 is fixed at each second through hole. The first retaining ring 313 and the second through hole constitute the first mounting groove 311, and the inner ring portion of the first retaining ring 313 constitutes the radial hole 3111.

[0059] The cross-sectional shape of the block 32 along the radial direction of the first tube body 31 can be circular, square or other shapes, as long as the second block 322 can match the shape of the radial hole 3111, so that the second block 322 can slide in the radial hole 3111. Generally, the first retaining ring 313 is welded and fixed to the first tube body 31. It can be understood that the first retaining ring 313 has a certain curvature as a whole, and can constitute a part of the tube wall of the first tube body 31 after being installed in the second through hole and welded and fixed. Generally, a slot 323 is opened on the outer side of the upper end and the outer side of the lower end of the first block 321, and the inner side end of the first spring 33 is embedded in the slot 323.

[0060] Further, in order to facilitate the processing and installation of the cone slider 34, as Figure 3 As shown, the conical slider 34 includes a conical block 341, a limit block 342 and an upper spring seat 343 which are arranged in sequence from top to bottom. An outer conical surface is formed on the outer wall of the upper end of the conical block 341. The limit block 342 passes through the first through hole 312 and is fixed to the first protective cover 37. The lower end surface of the limit block 342 can abut against the lower side hole wall of the first through hole 312. The two ends of the second spring 35 respectively abut against the upper spring seat 343 and the lower spring seat 36.

[0061] In order to facilitate the fixation of the limiting block 342 and the first protective cover 37, as shown in FIG. Figure 3 and Figure 4 As shown, a groove 314 communicating with the first through hole 312 is provided on the side wall of the first tube body 31 and below the first through hole 312 . The lower end of the limit block 342 extends downward to form a convex plate 3421 . The convex plate 3421 is inserted into the groove 314 and fixedly connected to the first protective cover 37 .

[0062] Among them, the number of the grooves 314, the convex plates 3421 and the first through holes 312 is the same, and one is provided for each in this embodiment. Generally, the limit block 342 is fixedly connected to the first protective cover 37 by a first screw 371 (specifically, the convex plate 3421 is fixedly connected to the first protective cover 37 by a first screw 371), and the upper end and the lower end of the first protective cover 37 are fixedly connected to the first tube body 31 by a second screw 372. During salvage, when the first protective cover 37 is milled off, the limit block 342 will push the conical block 341 upward under the action of the second spring 35, and then push the clamping block 32 to extend outward.

[0063] Furthermore, in order to facilitate fixing of the lower spring seat 36 , an annular groove 315 is formed on the inner wall of the lower end of the first tube body 31 , a retaining ring 38 is embedded in the annular groove 315 , and the lower end of the lower spring seat 36 abuts against the retaining ring 38 .

[0064] Generally, a longitudinal cutout is provided on the side wall of the retaining ring 38, so that the retaining ring 38 has a certain elasticity, and the entire retaining ring 38 is in a squeezed state when installed in the annular groove 315, which is convenient for installation. The lower end of the lower spring seat 36 abuts against the retaining ring 38 under the action of the first spring 33, thereby achieving fixed limit of the lower spring seat 36.

[0065] Furthermore, in order to avoid the serious accumulation of debris at the bottom, which may cause the salvage tool to be unable to smoothly lift the window beveler, such as Figure 2 As shown, an anti-chip leather cup 4 is sleeved between the slider fishing mechanism 3 and the plug 6, and the opening of the anti-chip leather cup 4 is arranged upward.

[0066] In this way, the anti-chip leather cup 4 can reduce the debris settled in the annulus below it, and can effectively wash away the debris on the anti-chip leather cup 4 during the flushing operation, effectively ensuring that after the clamping block 32 is clamped by the clamping shoulder 011 of the sleeve milling and salvage tool, it can be more smoothly lifted out, preventing the situation of being stuck due to serious accumulation of debris below. Generally, in order to reduce the resistance when lifting the sleeve milling and salvage tool, the sleeve milling and salvage tool will be lowered to the position of the anti-chip leather cup 4, the anti-chip leather cup 4 will be milled off, and then lifted up.

[0067] In actual use, in order to prevent the above-mentioned slider salvage mechanism 3 from failing, the success of the salvage is further ensured. Figure 2 and Figure 6As shown, a redundant salvage mechanism 5 is also connected between the slider salvage mechanism 3 and the plug 6, and the redundant salvage mechanism 5 includes a second tube body 51, and the anti-chip leather bowl 4 is sleeved on the outer side of the upper end of the second tube body 51. At least two second mounting grooves 511 are arranged at intervals along the circumference of the outer wall of the second tube body 51 and below the anti-chip leather bowl 4, and a radially movable spring block 52 is embedded in each second mounting groove 511, and a third spring 53 is sandwiched between the spring block 52 and the second mounting groove 511. A second protective cover 54 is sleeved and fixed on the outer side of the second tube body 51 and at a position corresponding to the second mounting groove 511, and the outer side of the spring block 52 can abut against the second protective cover 54.

[0068] Generally, the upper end of the second protective cover 54 is fixedly connected to the second tube body 51 by a third screw 541, and the lower part of the second protective cover 54 can cover the second mounting groove 511. In the initial state, the spring block 52 is pressed against the second protective cover 54 by the third spring 53. During salvage, when the sleeve milling tool is lowered to the position of the redundant salvage mechanism 5, after the sleeve milling head 02 mills off the second protective cover 54, the spring block 52 pops outward under the action of the third spring 53, so that the sleeve milling salvage tool can clamp the spring block 52 when the clamping shoulder 011 is lifted, thereby pulling out the window opening whipstock.

[0069] Generally, the redundant salvage mechanism 5 is relatively smaller in size than the slider salvage mechanism 3 described above. Since the anti-chip leather cup 4 can basically block the chips and basically flush out the chips during the flushing operation, there are basically or very few chips at the position of the redundant salvage mechanism 5. After the second protective cover 54 is milled off, the position of the bullet block 52 will not be stuck, so that the bullet block 52 can be ejected smoothly. The entire redundant salvage mechanism 5 can be regarded as an auxiliary backup for the slider salvage mechanism 3. When the slider salvage mechanism 3 has a problem and the block 32 does not extend, the redundant salvage mechanism 5 can also be used to achieve effective salvage.

[0070] In actual operation, when the sleeve milling and salvage tool is lowered, the first protective cover 37 and the anti-chip leather cup 4 can be milled off first, and then directly lifted. If the shoulder 011 of the sleeve milling and salvage tool can effectively clamp the block 32, it can be directly lifted up to achieve salvage; if it is found that the shoulder 011 cannot clamp the block 32 at this time, it may be because the block 32 is not effectively extended. The sleeve milling and salvage tool can be further lowered to mill off the second protective cover 54, and then lifted upward so that its shoulder 011 is clamped on the ejected block 52 to achieve salvage. Of course, in actual operation, the first protective cover 37, the anti-chip leather cup 4 and the second protective cover 54 can also be milled off in sequence when the sleeve milling and salvage tool is lowered, and then lifted upward so that its shoulder 011 is clamped on the ejected block 52 to achieve salvage. The specific operation method can be determined according to needs, and this embodiment is only for example. Therefore, by providing the slider salvage mechanism 3 and the redundant salvage mechanism 5, the risk of salvage failure due to debris blockage can be effectively reduced, thereby greatly improving the success rate of salvage.

[0071] Furthermore, in order to facilitate the limiting of the elastic block 52 when it is extended, as shown in FIG. Figure 6 and Figure 7 As shown, the spring block 52 includes a first spring block 521 and a second spring block 522 extending outward from the middle of the outer side of the first spring block 521, and the axial length of the second spring block 522 along the second tube body 51 is less than the axial length of the first spring block 521. The second mounting groove 511 includes a first stepped hole and a second stepped hole whose apertures decrease from the outside to the inside in the radial direction of the second tube body 51, and a second retaining ring 512 is fixed in the first stepped hole, and the second spring block 522 is inserted in the second retaining ring 512. The outer side of the upper end and the outer side of the lower end of the first spring block 521 can abut against the second retaining ring 512, and the third spring 53 abuts between the first spring block 521 and the bottom of the second mounting groove 511.

[0072] The cross-sectional shape of the spring block 52 along the radial direction of the second tube body 51 can be circular, square or other shapes, as long as the second spring block 522 can match the shape of the inner ring of the second retaining ring 512, so that the second spring block 522 can slide in the second retaining ring 512. Generally, the second retaining ring 512 is welded and fixed to the second tube body 51. It can be understood that the second retaining ring 512 has a certain curvature as a whole, and can constitute a part of the tube wall of the second tube body 51 after being installed in the first stepped hole and welded and fixed. When in use, when the second protective cover 54 is milled off and the spring block 52 pops outward under the action of the third spring 53, the second retaining ring 512 can limit the spring block 52.

[0073] Generally, the second mounting groove 511 further includes a third stepped hole located inside the second stepped hole along the radial direction of the second tube body 51, and the aperture of the third stepped hole is smaller than the aperture of the second stepped hole. An embedding groove 523 is provided inside the first spring block 521, and the inner side and outer side of the third spring 53 are respectively embedded in the third stepped hole and the embedding groove 523.

[0074] In addition, when installing the second protective cover 54, it is generally inserted from top to bottom. When the sleeve milling and salvage tool is lowered, the second protective cover 54 needs to be milled off and then lifted up. Therefore, in order to facilitate the installation of the second protective cover 54 and the smooth lowering of the sleeve milling and salvage tool, the upper outer side of the first spring block 521 is an inclined surface, and the lower outer side is a plane, which can be against the second protective cover. The inclined direction of the inclined surface is inclined from the upper part of the first spring block 521 to the direction in which the radial dimension of the plane gradually increases from top to bottom. In this way, the second protective cover 54 or the sleeve milling and salvage tool can be smoothly pressed over the spring block 52 and smoothly lowered by using the inclined surface.

[0075] Furthermore, the above-mentioned inclined surface body 1 mainly plays the role of providing lateral force for the window milling cone or drilling tool, such as Figure 2 As shown, the inclined body 1 includes a columnar body, and an outer inclined surface is formed on the upper side of the columnar body. When the milling and salvage tool is lowered to the position of the slider salvage mechanism 3, its rotation speed, drilling pressure and milling process parameters need to be adjusted accordingly. The error is large if the position is judged only based on the well depth. Therefore, in order to more accurately judge the milling position, a plurality of color centralizers 2 are arranged at intervals along the axial direction of the side wall of the columnar body. Each group of color centralizers 2 includes at least one radially protruding color centralizer block 21, and each color centralizer block 21 is filled with a colored liquid.

[0076] It can be understood that each group of color centralizers 2 corresponding to the position where no outer bevel is formed on the columnar body can include a plurality of color centralizer blocks 21 evenly spaced along its circumference; for the position where the outer bevel is formed, each group of color centralizers 2 may be provided with one or two color centralizer blocks 21 according to the specific position of the outer bevel. The specific number is determined according to actual needs, and this embodiment is only for example.

[0077] The colored color filled in the color straightening blocks 21 at the same axial position of the columnar body is the same, and the colored color filled in the color straightening blocks 21 at different axial positions is different. When the casing milling salvage tool is lowered to the position of the corresponding color straightening block 21, it will be milled away. At this time, the colored liquid stored in the color straightening block 21 will flow into the flushing liquid and circulate to the ground. By observing the color of the colored liquid mixed with the flushing liquid, the casing milling position can be accurately judged. It is simple and convenient, which is conducive to optimizing the operation parameters and improving the casing milling efficiency. At the same time, the outer diameter of each color straightening block 21 is basically equal to the inner diameter of the casing, and its outer wall is basically close to the inner wall of the casing, which can also play a certain straightening role.

[0078] Furthermore, in order to facilitate processing and installation, as Figure 2 and Figure 8 As shown, a receiving groove is opened on the side wall of the columnar body corresponding to the position of each color-developing straightening block 21, and each color-developing straightening block 21 is embedded and fixed in the receiving groove, and the outer side of the color-developing straightening block 21 protrudes from the outer wall of the columnar body, and a storage sealed cavity is formed between the inner side of the color-developing straightening block 21 and the bottom of the receiving groove, and the colored liquid is filled in the storage sealed cavity.

[0079] A storage groove 211 is provided on the inner side of the color developing and straightening block 21, and the above-mentioned storage sealed cavity is formed between the storage groove 211 and the bottom of the receiving groove. Generally, the color developing and straightening block 21 is fixed to the side wall of the columnar body by a fourth screw. During installation, the colored liquid can be added to the storage groove 211, and the notch of the storage groove 211 is placed upward and the color developing and straightening block 21 is fixed to the columnar body.

[0080] The above are only exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A milling and salvaging window opening whipstock, characterized in that: It includes a ramp body, a slider salvage mechanism and a plug which are sequentially connected from top to bottom; The slider salvage mechanism comprises a first tube body arranged vertically, at least two first installation grooves are evenly spaced along the circumference of the inner wall of the first tube body, and a radial hole is formed at the bottom of each first installation groove; a radially movable clamping block is embedded in each first installation groove, a first spring is sandwiched between the outer walls at both ends of the clamping block and the bottom of the first installation groove, and the middle part of the clamping block is penetrated in the radial hole; A cone slider, a second spring and a lower spring seat are sequentially sleeved in the first tube body and below the clamping block from top to bottom, an outer conical surface is formed on the upper end of the cone slider, an inner inclined surface matching the outer conical surface is formed on the inner wall of the clamping block and abuts against the outer conical surface, and the lower spring seat is fixed to the first tube body; a first through hole is opened in the side wall of the first tube body and below the first mounting groove, a first protective sleeve is sleeved and fixed on the outer side of the first tube body, two ends of the first protective sleeve are respectively located above the first mounting groove and below the first through hole, and the middle part of the cone slider passes through the first through hole and is fixed to the first protective sleeve; An anti-chip leather cup is sleeved between the slider salvaging mechanism and the plug, and the opening of the anti-chip leather cup is arranged upward; A redundant salvage mechanism is also connected between the slider salvage mechanism and the plug, and the redundant salvage mechanism includes a second tube body, and the anti-chip leather cup is sleeved on the outer side of the upper end of the second tube body; at least two second mounting grooves are arranged on the outer wall of the second tube body and below the anti-chip leather cup along the circumferential direction thereof, and a radially movable spring block is embedded in each of the second mounting grooves, and a third spring is sandwiched between the spring block and the second mounting groove; a second protective cover is sleeved and fixed on the outer side of the second tube body and at a position corresponding to the second mounting groove, and the outer side of the spring block can abut against the second protective cover; The elastic block includes a first elastic block and a second elastic block extending outward from the middle of the outer side of the first elastic block, the axial length of the second elastic block along the second tube body is smaller than the axial length of the first elastic block; the second mounting groove includes a first stepped hole and a second stepped hole whose apertures decrease from the outside to the inside in the radial direction of the second tube body, a second retaining ring is fixed in the first stepped hole, and the second elastic block is inserted in the second retaining ring; the outer side of the upper end and the outer side of the lower end of the first elastic block can abut against the second retaining ring, and the third spring abuts between the first elastic block and the bottom of the second mounting groove; The second mounting groove also includes a third stepped hole located on the inner side of the second stepped hole along the radial direction of the second tube body, and the aperture of the third stepped hole is smaller than the aperture of the second stepped hole; an embedding groove is opened on the inner side of the first spring block, and the inner and outer sides of the third spring are respectively embedded in the third stepped hole and the embedding groove; the outer side of the upper part of the first spring block is an inclined surface, and the outer side of the lower part is a plane, which can abut against the second protective cover.

2. The milling and salvaging window opening whipstock according to claim 1, characterized in that: Each of the blocks includes a first block and a second block extending outward from the middle of the outer side of the first block, wherein the axial length of the second block along the first tube body is smaller than the axial length of the first block; the first spring is respectively sandwiched between the outer side of the upper end and the outer side of the lower end of the first block and the bottom of the first mounting groove, the second block is inserted into the radial hole, and the inner inclined surface is formed on the inner wall of the first block.

3. The milling and salvaging window opening whipstock according to claim 2, characterized in that: At least two second through holes are spaced apart along the circumference of the side wall of the first tube body, a first retaining ring is fixed at each of the second through holes, the first retaining ring and the second through hole constitute the first mounting groove, and the inner ring portion of the first retaining ring constitutes the radial hole.

4. The milling and salvaging window opening whipstock according to claim 1, characterized in that: The conical slider includes a conical block, a limit block and an upper spring seat which are arranged in sequence from top to bottom, the outer conical surface is formed on the outer wall of the upper end of the conical block, the limit block passes through the first through hole and is fixed to the first protective cover, and the lower end surface of the limit block can abut against the lower side hole wall of the first through hole, and the two ends of the second spring respectively abut against the upper spring seat and the lower spring seat.

5. The milling and salvaging window opening whipstock according to claim 4, characterized in that: A groove communicating with the first through hole is provided on the side wall of the first tube body and below the first through hole. The lower end of the limit block extends downward to form a convex plate. The convex plate is inserted into the groove and fixedly connected to the first protective cover.

6. The milling and salvaging window opening whipstock according to claim 4, characterized in that: The limiting block is fixedly connected to the first protective cover by a first screw, and the upper end and the lower end of the first protective cover are fixedly connected to the first tube body by a second screw.

7. The milling and salvaging window opening whipstock according to claim 1, characterized in that: An annular groove is formed on the inner wall of the lower end of the first tube body, a retaining ring is embedded in the annular groove, and the lower end of the lower spring seat abuts against the retaining ring.

8. The milling and salvaging window opening whipstock according to claim 1, characterized in that: The inclined body includes a columnar body with an outer inclined surface formed on the upper side of the columnar body. A plurality of groups of color straighteners are arranged at intervals along the axial direction on the side wall of the columnar body. Each group of the color straighteners includes at least one radially protruding color straightening block, and each of the color straightening blocks is filled with a colored liquid.

9. The milling and salvaging window opening whipstock according to claim 8, characterized in that: A receiving groove is provided on the side wall of the columnar body at a position corresponding to each of the color-developing straightening blocks. Each of the color-developing straightening blocks is embedded and fixed in the receiving groove, and the outer side of the color-developing straightening block protrudes from the outer wall of the columnar body. A storage sealed cavity is formed between the inner side of the color-developing straightening block and the bottom of the receiving groove, and the colored liquid is filled in the storage sealed cavity.

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