Integral water plugging pipe column suitable for plugging shale gas horizontal well
阅读说明:本技术 一种适应页岩气水平井封堵的整体式堵水管柱 (Integral water plugging pipe column suitable for plugging shale gas horizontal well ) 是由 管斌 程永红 程忱 徐兴权 于 2019-10-29 设计创作,主要内容包括:本发明公开了一种适应页岩气水平井封堵的整体式堵水管柱,其包括从上至下依次连接的油管、助座器、可钻封隔器及可溶堵塞芯子,所述助座器的最下端通过坐封推筒及可溶扶正套与可钻封隔器相连,在坐封推筒及可溶扶正套形成的筒形结构内设有丢手机构,所述丢手机构上端与助座器的中心管相连,下端与可钻封隔器相连,当可溶扶正套及可溶堵塞芯子溶解后,通过在液压丢手可实现助座器与封隔器的分离。本发明管柱耐温耐压性能高、能够利用一趟管柱实现液压坐封坐卡、堵水生产,解除时候先液压丢手,取出小直径助座器,然后钻铣相对短且易钻封隔器,恢复套管原通径,使用安全可靠,提高了施工效率。(The invention discloses an integral water plugging pipe column suitable for plugging a shale gas horizontal well, which comprises an oil pipe, a seat booster, a drillable packer and a soluble plugging core which are sequentially connected from top to bottom, wherein the lowest end of the seat booster is connected with the drillable packer through a setting push cylinder and a soluble centralizing sleeve, a releasing mechanism is arranged in a cylindrical structure formed by the setting push cylinder and the soluble centralizing sleeve, the upper end of the releasing mechanism is connected with a central pipe of the seat booster, the lower end of the releasing mechanism is connected with the drillable packer, and when the soluble centralizing sleeve and the soluble plugging core are dissolved, the separation of the seat booster and the packer can be realized through hydraulic releasing. The tubular column has high temperature resistance and pressure resistance, can realize hydraulic setting, setting and blocking and water plugging production by utilizing one-trip tubular column, firstly releases hydraulic pressure when relieving, takes out the small-diameter seat aid, then drills and mills the packer which is relatively short and easy to drill, recovers the original drift diameter of the casing, is safe and reliable to use, and improves the construction efficiency.)
1. The utility model provides an integral water shutoff tubular column of adaptation shale gas horizontal well shutoff, its includes from last oil pipe, the seat ware of helping, the packer that can bore and soluble core that blocks up that connects gradually down, its characterized in that: the seat aid is boosted through a multi-stage hydraulic piston structure, each stage of hydraulic piston structure comprises a central pipe and a piston sleeve, the lowest end of the seat aid is connected with a drillable packer through a setting push cylinder and a soluble centralizing sleeve, hydraulic pressure enters a corresponding piston cavity through a pressure transfer hole in the central pipe, a lower stage hydraulic piston structure and the setting push cylinder are pushed under the action force of set pressure difference, then the drillable packer is set, a releasing mechanism is arranged in a cylindrical structure formed by the setting push cylinder and the soluble centralizing sleeve, the upper end of the releasing mechanism is connected with the central pipe of the seat aid, the lower end of the releasing mechanism is connected with the drillable packer, and after the soluble centralizing sleeve and the soluble plugging core are dissolved, the seat aid can be separated from the packer through hydraulic releasing.
2. The integral water plugging tubular column adapted for plugging shale gas horizontal wells according to claim 1, wherein: the outer diameter of the insoluble part of the seat aid is smaller than the outer diameter of the drillable packer and larger than the outer diameter of the tubing coupling, and the outer diameter of the soluble centralizer is larger than the outer diameter of the drillable packer.
3. The integral water shutoff string adapted for plugging shale gas horizontal wells according to claim 1 or 2, wherein: the releasing mechanism comprises a releasing central pipe, a supporting sleeve connected with the lower end of the releasing central pipe through a releasing pin, a setting push cylinder sleeved outside the releasing central pipe, and a claw-type locking finger arranged between the supporting sleeve and the setting push cylinder, wherein the lower end of the claw-type locking finger is connected with an internal thread sleeve, a claw of the claw-type locking finger is hermetically pressed in a locking groove at the upper end of the internal thread sleeve through the supporting sleeve, the internal thread sleeve is fixedly connected with the drillable packer, a radial pressure relief channel is arranged on the supporting sleeve, when the supporting sleeve goes down, a side pressure relief channel is formed between the supporting sleeve and the claw-type locking finger, pressure relief is carried out through the side pressure relief channel and the radial pressure relief channel, and the lower end of the setting push cylinder is connected with the drillable packer through a soluble centering sleeve.
4. The integral water shutoff tubular column adapted for plugging shale gas horizontal wells according to claim 3, wherein: the inside sealed face of back taper that is equipped with of the upper end of supporting the cover, the lower extreme stretches into in the center tube that can bore the packer to can slide rather than it.
5. The integral water shutoff tubular column adapted for plugging shale gas horizontal wells according to claim 3, wherein: the claw type lock finger comprises an upper section, a terminal and a lower section, the upper end of the claw type lock finger is in sealed configuration with the central tube, the middle section and the lower end of the claw type lock finger form a plurality of lock fingers which are circumferentially arranged, the lower end of the claw type lock finger is connected with the internal thread sleeve through right-handed threads, an inner groove with the inner diameter gradually increased is arranged in the middle section of the claw type lock finger, the inner groove is located below the releasing pin, and when the supporting sleeve falls into the inner groove downwards, the supporting sleeve.
6. The integral water shutoff tubular column adapted for plugging shale gas horizontal wells according to claim 5, wherein: an annular gap is arranged between the internal thread sleeve and the supporting sleeve, and the upper end of the internal thread sleeve is provided with a locking groove which is connected with a locking finger on the claw type locking finger in a sealing way.
7. The integral water shutoff tubular column adapted for plugging shale gas horizontal wells according to claim 3, wherein: the outer wall of the upper end of the support sleeve is provided with a flange, the flange is in sealing connection with the claw-type lock finger, and the radial pressure relief channel comprises an upper pressure relief opening arranged below the flange and a lower pressure relief opening arranged below the support sleeve.
8. The integral water shutoff string adapted for plugging shale gas horizontal wells according to claim 7, characterized in that: the upper pressure relief port is a support sleeve milling groove, and the lower pressure relief port is a support sleeve cutting groove.
9. The integral water shutoff string adapted for plugging shale gas horizontal wells according to claim 1 or 2, wherein: the drillable packer comprises a central lock tooth pipe, wherein an upper lock tooth sleeve, an upper slip component, a rubber cylinder, a shoulder guard component and a lower slip component are sequentially arranged outside the central lock tooth pipe, the upper lock tooth sleeve is matched with a ratchet wheel lock ring, an internal thread sleeve is connected with the central lock tooth pipe, and a soluble blocking core is hermetically connected with the lower end part of the central lock tooth pipe.
10. The integral water shutoff string adapted for plugging shale gas horizontal wells according to claim 9, characterized in that: the internal thread sleeve is connected and sealed with the conical thread of the central lock gear pipe, and the upper lock gear sleeve is fixed with the milling groove pin of the internal thread sleeve.
Technical Field
The invention relates to a water plugging pipe column for shale gas development, in particular to an integral water plugging pipe column suitable for plugging a shale gas horizontal well.
Background
Aiming at the water outlet of the upper part of the shale gas horizontal well, a tubular column is adopted for water shutoff, namely, an oil pipe is connected with a permanent packer to be clamped and sealed below a water outlet section, and the oil pipe is used as a production channel. But in view of the current relatively low international oil and gas prices, the search for lower cost, efficiency and risk strings is the primary direction of consideration for domestic oil and gas enterprises. The adoption of mechanical setting can not meet the requirement, and the main tubular columns for water plugging of gas production wells at home and abroad at present are as follows: 1. the oil pipe is connected with a seat aid and a permanent packer, the packer is set to a designed depth, the packer is released after hydraulic setting, the pipe column is lifted out, then the pipe column with the insertion pipe is set, the pipe column with the insertion pipe is inserted into the permanent packer to complete the well, and the insertion pipe can be rotated, unscrewed and replaced. 2. The oil pipe is connected with a permanent packer, and after the permanent packer is put in, the permanent packer is directly hydraulically set and clamped, and a ball seat is punched for production. The hydraulic piston of the permanent packer is positioned below a rubber sleeve slip, the upper part of the rubber sleeve is connected with a rotatable tripping insertion pipe, and the insertion pipe can be replaced. These two hydraulic permanent packers are not suited for shale gas horizontal wells: 1. shale gas wells are usually operated under pressure instead of killing, for example, in the first operation mode, the cost of two times of pipe columns without pressing is lower than 30 ten thousand, if the shale gas wells are pressed under pressure, the cost of one time is over 200 thousand, the cost of two times is close to 500 thousand, and for the cost, petroleum enterprises are difficult to satisfy. 2. The second kind is one time to accomplish the tubular column of setting and setting the completion of block, its hydraulic piston is located below the packing element slips, and permanent packer all adopts integral slips, reliable shoulder outburst prevention mechanism, and its setting thrust needs great power, inquiry data, and there is single-stage piston also to have multistage piston mechanism in the existing market, and single-stage piston probably will encroach more internal diameters and improve piston area, nevertheless no matter that kind of mode, and this kind of structure still needs salvage when finally drilling and milling to the piston, and the construction risk is great. It is relatively difficult to salvage objects with irregular fish tops and non-rotation prevention in the horizontal section. In addition, the rotation back-off and disengagement mode adopted by the insertion pipe is not beneficial to releasing in the horizontal section under-pressure operation.
The invention provides a technical scheme of a tubular column capable of safely and reliably blocking water outlet at the upper part of a shale gas horizontal well. The pipe column has high temperature resistance and pressure resistance, can realize hydraulic setting, blocking and water plugging production by utilizing the pipe column once, firstly releases hydraulic pressure when releasing, takes out the small-diameter seat assisting device, then drills and mills the packer which is relatively short and easy to drill, and recovers the original drift diameter of the casing pipe.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an integral water plugging tubular column suitable for plugging a shale gas horizontal well, which can realize hydraulic setting, setting and blocking production by utilizing a tubular column once, firstly release hydraulic pressure when releasing, take out a small-diameter seat aid, then drill and mill a relatively short and easily drilled packer, recover the original drift diameter of a casing pipe, and greatly improve the construction efficiency.
The technical scheme adopted by the invention is as follows: the utility model provides an integral water shutoff tubular column of adaptation shale gas horizontal well shutoff, its includes from last oil pipe, the seat ware of helping, the packer that can bore and soluble core that blocks up that connects gradually down, its characterized in that: the packer-aid device is boosted by a plurality of stages of hydraulic pistons, each stage of hydraulic piston comprises a central pipe and a piston sleeve, the lowest end of the packer-aid device is connected with a drillable packer through a setting push cylinder and a soluble centralizing sleeve, hydraulic pressure enters a corresponding piston cavity through a pressure transmission hole in the central pipe, a lower-level piston structure and the setting push cylinder are pushed under the action force of set pressure difference, so that the drillable packer is set, a releasing mechanism is arranged in a cylindrical structure formed by the setting push cylinder and the soluble centralizing sleeve, the upper end of the releasing mechanism is connected with the central pipe of the packer-aid device, the lower end of the releasing mechanism is connected with the drillable packer, and after the soluble centralizing sleeve and the soluble plugging core are dissolved, the separation of the packer-aid device and the packer can be realized through the hydraulic releasing mechanism.
According to the technical scheme, the outer diameter of the insoluble part of the seat aid is smaller than the outer diameter of the drillable packer and larger than the outer diameter of the tubing coupling, so that the soluble centralizer can be conveniently pulled out after being released, the outer diameter of the soluble centralizer is larger than the outer diameter of the drillable packer, the soluble centralizer plays a role in centralization and impact resistance in the process of going down a well, the packer is prevented from being set in advance, and normal water plugging production can be automatically dissolved within a period of time.
According to the technical scheme, the releasing mechanism comprises a releasing central pipe, a supporting sleeve connected with the lower end of the releasing central pipe through a releasing pin, a setting push cylinder sleeved outside the releasing central pipe, and a claw-type locking finger arranged between the supporting sleeve and the setting push cylinder, wherein the lower end of the claw-type locking finger is connected with an internal thread sleeve, a claw of the claw-type locking finger is hermetically pressed in a locking groove at the upper end of the internal thread sleeve through the supporting sleeve, the internal thread sleeve is fixedly connected with the drillable packer, a radial pressure relief channel is arranged on the supporting sleeve, when the supporting sleeve goes down, a side pressure relief channel is formed between the supporting sleeve and the claw-type locking finger, pressure relief is carried out through the side pressure relief channel and the radial pressure relief channel, and the lower end of the setting push cylinder is connected with the drillable packer through a soluble centering sleeve.
According to the technical scheme, the inverted cone-shaped sealing surface is arranged inside the upper end of the support sleeve, and the lower end of the support sleeve extends into the center tube of the drillable packer and can slide relative to the center tube.
According to the technical scheme, the claw type lock finger comprises an upper section, a terminal and a lower section, the upper end is in sealed configuration with the central tube, the middle section and the lower end form a plurality of lock fingers which are circumferentially arranged, the lower end is connected with the internal thread sleeve through right-handed threads, an inner groove with the gradually increased inner diameter is arranged in the middle section, the inner groove is located below the releasing pin, and when the supporting sleeve falls into the inner groove downwards, the supporting sleeve can be hung.
According to the technical scheme, an annular gap is arranged between the internal thread sleeve and the supporting sleeve, and the upper end of the internal thread sleeve is provided with a locking groove which is connected with a locking finger on the claw type locking finger in a sealing manner.
According to the technical scheme, the outer wall of the upper end of the supporting sleeve is provided with a flange, the flange is in sealing connection with the claw-type lock finger, and the radial pressure relief channel comprises an upper pressure relief opening arranged below the flange and a lower pressure relief opening arranged below the supporting sleeve.
According to the technical scheme, the upper pressure relief port is a support sleeve milling groove, and the lower pressure relief port is a support sleeve slotting.
According to the technical scheme, the drillable packer comprises a central lock tooth pipe, wherein an upper lock tooth sleeve, an upper slip component, a rubber cylinder, a shoulder protecting component and a lower slip component are sequentially arranged outside the central lock tooth pipe, the upper lock tooth sleeve is matched with a ratchet wheel lock ring, an internal thread sleeve is connected with the central lock tooth pipe, and a soluble blocking core is hermetically connected with the lower end part of the central lock tooth pipe.
According to the technical scheme, the internal thread sleeve is connected and sealed with the conical thread of the central lock gear pipe, and the upper lock gear sleeve is fixed with the milling groove pin of the internal thread sleeve.
The beneficial effects obtained by the invention are as follows:
1. the tubular column has high temperature resistance and pressure resistance, can realize hydraulic setting, setting and blocking and water plugging production by utilizing the tubular column once, firstly releases hydraulic pressure when relieving, takes out the small-diameter seat aid, then drills and mills the packer which is relatively short and easy to drill, recovers the original drift diameter of the casing, is safe and reliable to use, and greatly improves the construction efficiency.
2. The claw type lock finger of the releasing mechanism adopts claw type conical right screw to be mutually embedded and connected with the internal thread sleeve, the non-releasing state is maintained under the support of the support sleeve, the threaded connection type mutual embedding surface is large, the depth is shallow, the releasing is reliable, and the connection strength is high.
3. The slotting type pressure relief channel is adopted, so that production gas carrying sand grains are effectively prevented from entering the releasing mechanism, and the releasing reliability is improved.
Drawings
Fig. 1 is a structural diagram of an integral water shutoff pipe column of the invention.
FIG. 2 is a block diagram of the invention showing the integral configuration of a landing aid and drillable packer (two separate blocks).
Fig. 3 is a schematic view of a pressure relief channel of the release mechanism of the present invention.
Fig. 4 is a schematic view of a groove milling structure of the support sleeve of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1-4, the present embodiment provides an integral water plugging string suitable for plugging shale gas horizontal wells, which comprises an oil pipe, a mandrel 1, a
The seat aid is a multi-stage piston mechanism, each stage of piston mechanism comprises a central pipe 6 and a piston sleeve 5 which are sequentially connected inside and outside, and the lower end of the multi-stage piston is sequentially connected with a setting push cylinder 8 and a soluble centralizing
The releasing mechanism comprises a releasing central tube 7, a supporting
In this embodiment, an inverted conical sealing surface is arranged inside the upper end of the
In this embodiment, the claw-
An annular gap is arranged between the
The outer wall of the upper end of the
The soluble centralizing
The drillable packer is processed by high-strength nodular cast iron and aluminum alloy. The drillable packer comprises a central latch tooth pipe 23, an upper
During construction, the pipe column is sealed through the soluble plugging
The method specifically comprises the following steps: the tubular column is lowered to the designed depth, under the sealing condition of the
When the clamping state of the pipe column needs to be relieved, a phi 50.8mm steel ball 9 is thrown into the releasing mechanism, falls into a sealing inclined plane with the minimum inner diameter of 50mm of the releasing mechanism, and drops suddenly when the pressure is up to the pressure, the supporting
When drilling and milling, because prevent changeing the slips down of catch 25 fastening, keep the structure when drilling and milling and prevent changeing, when drilling and milling to preventing changeing catch 25 department, surplus and not hard up throw off, can adopt the formula of can backing off to drag for lance or strong magnetism to salvage, perhaps adopt to push to the artificial shaft bottom, because the lower clutch sets up two closed angles, but the artificial shaft bottom of anchoring prevents to rotate, is convenient for continue to bore and mill.
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