A ccus continuous coiled tubing injection wellhead

Abstract

The present application relates to petroleum, natural gas exploitation carbon dioxide flooding process technical field, it is a kind of CCUS coiled tubing injection wellhead device, including split slip, cone seat flange, I-flange, first sealing packing, second sealing packing, first pressure cap and second pressure cap, the lower end of I-flange and the upper end of cone seat flange are sealed and installed together, the inner hole of I-flange and the inner hole of cone seat flange are communicated up and down;The inner hole upper portion of cone seat flange is the taper hole of wide top and narrow bottom, split slip for being set on the outside of coiled tubing is arranged in the taper hole, split slip includes two pieces of slip piece distributed along circumference and outside adapts taper hole.This application has reasonable structure, the coiled tubing is gripped by split slip in the present application, and the suspension reliability of coiled tubing is good, double sealing is realized by first sealing packing and second sealing packing, and the sealing reliability is good, whether sealing is reliable can be tested by the setting of pressure test channel and annular cavity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon dioxide flooding technology for oil and gas exploitation, and is a CCUS coiled tubing injection wellhead device. BACKGROUND

[0002] With the development of CCUS technology, carbon dioxide flooding technology has been vigorously developed. This technology needs to inject carbon dioxide gas from the ground to the downhole to achieve the purpose of energy driving oil. Compared with ordinary pipe columns, coiled tubing has the advantage of good sealing performance due to its continuous characteristics, and thus is applied in the center of carbon dioxide flooding technology.

[0003] In the CCUS coiled tubing injection technology, the coiled tubing first needs to carry a large-diameter tool into the well. After the tool is lowered to the predetermined position, the coiled tubing string cannot be moved up and down. At this time, the coiled tubing needs to be clamped and suspended without cutting the pipe string. This requires that the suspension device can pass through the large-diameter tool and realize its suspension function without cutting the pipe string. After the pipe string is suspended, the annular space between the coiled tubing string and the casing needs to be sealed to isolate the production channel. In addition, it is also necessary to detect the sealing effectiveness. The existing tubing hanger has poor suspension reliability and poor sealing reliability when applied to the suspension of the coiled tubing. SUMMARY

[0004] The present application provides a CCUS coiled tubing injection wellhead device, which overcomes the shortcomings of the prior art and effectively solves the problem of poor suspension reliability and poor sealing reliability of the existing tubing hanger.

[0005] The technical scheme of the present application is realized by the following measures: a CCUS coiled tubing injection wellhead device, comprising split slips, a conical seat flange, an I-shaped flange, a first sealing packing, a second sealing packing, a first pressure cap and a second pressure cap, the lower end of the I-shaped flange and the upper end of the conical seat flange are sealingly installed together, and the inner hole of the I-shaped flange and the inner hole of the conical seat flange are in communication; the upper part of the inner hole of the conical seat flange is a tapered hole with a wide upper part and a narrow lower part, and the split slips for being sleeved outside the coiled tubing are arranged in the tapered hole, the split slips comprise two slip pieces distributed along the circumference and adapted to the tapered hole on the outside, the upper part of each slip piece is provided with a semicircular annular outer ring, the upper inner wall of the tapered hole corresponding to the position of the outer ring is provided with an outer ring groove, the outer ring is located in the outer ring groove, the outer ring is provided with a through hole penetrating from top to bottom, and the bottom wall of the outer ring groove corresponding to the position of the through hole is provided with a threaded counterbore, a first tapping bolt is threadedly connected in the threaded counterbore, and the upper end of the first tapping bolt is threadedly connected with a first locking nut penetrating through the through hole; the inner side of the upper part of the I-shaped flange is sequentially provided with a first ring groove and a second ring groove from top to bottom, the second ring groove is provided with the first sealing packing for being sealingly sleeved outside the coiled tubing, the first ring groove is fixedly installed with the first pressure cap for pressing the first sealing packing, the inner side of the upper part of the first pressure cap is sequentially provided with a third ring groove and a fourth ring groove from top to bottom, the fourth ring groove is provided with the second sealing packing for being sealingly sleeved outside the coiled tubing, and the fourth ring groove is fixedly installed with the second pressure cap for pressing the second sealing packing; the inner wall of the first pressure cap corresponding to the position between the first sealing packing and the second sealing packing is provided with a pressure test channel penetrating from the inside to the outside, and the outer end of the pressure test channel and the annular cavity formed between the upper outer side of the first pressure cap and the upper inner wall of the first ring groove are in communication.

[0006] The following is a further optimization or / and improvement of the above-mentioned invention scheme:

[0007] The upper inner side of each slip piece can be provided with a semicircular annular inner ring groove, the inner wall of the slip piece corresponding to the lower side of the inner ring groove is provided with a protruding tooth, and a plurality of vertical fine grooves are arranged on the slip piece corresponding to the lower side of the outer ring in the circumferential direction, and the lower end of the fine groove extends to the bottom end of the slip piece.

[0008] The outer side of the first pressure cap can be stepped with a large upper part and a small lower part, the first ring groove is stepped and adapted to the outer side of the first pressure cap, and the lower outer side of the first pressure cap and the lower inner wall of the first ring groove are threadedly connected together.

[0009] The upper and lower sides of the first sealing packing can be respectively provided with a first grommet, and the upper and lower sides of the second sealing packing can be respectively provided with a second grommet.

[0010] The conical seat flange and the I-shaped flange can be fixedly installed together by a second tapping bolt and a second locking nut, and a sealing ring is pressed between the top of the conical seat flange and the bottom of the I-shaped flange.

[0011] The bottom of the conical seat flange and the top of the I-shaped flange can be respectively provided with a sealing ring.

[0012] The structure of the application is reasonable, the split slip holds the coiled tubing, the suspension reliability of the coiled tubing is good, the double sealing is realized through the first sealing packing and the second sealing packing, the sealing reliability is good, the test sealing reliability can be realized through the setting of the pressure test channel and the annular cavity, in addition, the split slip is set in split, after the coiled tubing is put into the well, it is installed into the conical hole, thus, it will not hinder the large diameter tool into the well, and it is not necessary to cut the coiled tubing column, the application has the advantages of convenient installation, good suspension reliability, good sealing reliability, facilitating the large diameter tool into the well and not cutting the coiled tubing column. BRIEF DESCRIPTION OF DRAWINGS

[0013] ATTACHED Figure 1 It is the front view structure schematic diagram of the best embodiment of the application.

[0014] ATTACHED Figure 2 It is the top view structure schematic diagram of the split slip in the best embodiment of the application.

[0015] ATTACHED Figure 3 It is the perspective view of the split slip in the best embodiment of the application.

[0016] ATTACHED Figure 4 It is the perspective view of the slip piece in the best embodiment of the application.

[0017] The codes in the drawings are as follows: 1 is a conical seat flange, 2 is an I-shaped flange, 3 is a first sealing packing, 4 is a second sealing packing, 5 is a first pressure cap, 6 is a second pressure cap, 7 is a conical hole, 8 is a slip piece, 9 is an outer ring table, 10 is an outer ring groove, 11 is a first tapping screw bolt, 12 is a first locking nut, 13 is a pressure test channel, 14 is an annular cavity, 15 is an inner ring groove, 16 is a fine slot, 17 is a first grommet, 18 is a second grommet, 19 is a second tapping screw bolt, 20 is a second locking nut, 21 is a sealing ring, 22 is a through hole, 23 is a convex tooth, and 24 is a coiled tubing. DETAILED DESCRIPTION

[0018] The application is not limited by the following embodiments, and the specific implementation mode can be determined according to the technical scheme of the application and the actual situation.

[0019] In the application, in order to facilitate the description, the relative position relationship of each component is described according to the layout mode of the drawings attached to the specification, such as the position relationship of front, back, top, bottom, left, right and the like is determined according to the layout direction of the drawings attached to the specification. Figure 1

[0020] The application will be further described in combination with the embodiments and the drawings:​

[0021] As attached Figures 1-4 As shown, the CCUS coiled tubing injection wellhead assembly includes split slips, a tapered flange 1, an H-beam flange 2, a first sealing packing 3, a second sealing packing 4, a first pressure cap 5, and a second pressure cap 6. The lower end of the H-beam flange 2 and the upper end of the tapered flange 1 are sealed together, and the inner bore of the H-beam flange 2 and the inner bore of the tapered flange 1 are vertically connected. The upper part of the inner bore of the tapered flange 1 is a truncated cone hole 7, which is wider at the top and narrower at the bottom. The truncated cone hole 7 is provided with a split slip for fitting onto the outside of the coiled tubing 24. The split-type slip includes two slip pieces 8 distributed circumferentially and whose outer sides are adapted to the frustum-shaped hole 7. Each slip piece 8 has a semi-circular outer ring platform 9 on its upper outer side. The upper inner wall of the frustum-shaped hole 7 corresponding to the position of the outer ring platform 9 has an outer ring groove 10. The outer ring platform 9 is located in the outer ring groove 10. The outer ring platform 9 has a through hole 22 that runs vertically through it. The bottom wall of the outer ring groove 10 corresponding to the position of the through hole 22 has a threaded countersunk hole. The threaded countersunk hole is threadedly connected to a first threaded bolt. 11, and the upper end of the first threaded bolt 11 passes through the through hole 22 and is threadedly connected to the first locking nut 12; the upper inner side of the I-beam flange 2 is provided with a first annular groove and a second annular groove from top to bottom. The second annular groove is provided with a first sealing packing 3 for sealing the outer side of the continuous tubing 24. The first annular groove is fixedly installed with a first pressure cap 5 for pressing the first sealing packing 3. The upper inner side of the first pressure cap 5 is provided with a third annular groove and a fourth annular groove from top to bottom. The fourth annular groove is provided with a second sealing packing 4 for sealing the outer side of the continuous tubing 24. The fourth annular groove is fixedly installed with a second pressure cap 6 for pressing the second sealing packing 4. The inner wall of the first pressure cap 5, corresponding to the position between the first sealing packing 3 and the second sealing packing 4, is provided with a test pressure channel 13 that runs through the inside and outside. The upper outer side of the first pressure cap 5 and the upper inner wall of the first annular groove form an annular cavity 14 that is closed at the bottom and open at the top. The outer end of the test pressure channel 13 is connected to the annular cavity 14.

[0022] Specifically, the first compression cap 5 is threadedly connected to the I-shaped flange 2, the lower end of the first compression cap 5 abutting against the upper end of the first sealing packing 3, the second compression cap 6 is threadedly connected to the first compression cap 5, the lower end of the second compression cap 6 abutting against the upper end of the second sealing packing 4, the included angle between the generatrix of the conical hole 7 and the vertical direction is 8 degrees, the outer ring 9 and the slip 8 are integrally arranged, in use, first, the cone seat flange 1 is installed on the top of the wellhead tubing head, then the coiled tubing 24 carrying the seat seal cutter is lowered to the bottom of the well to the predetermined position, at this time, the coiled tubing 24 is fixed in position at the wellhead, then the two slips 8 are installed in the conical hole 7 and are sleeved on the coiled tubing 24, a special tool is used to knock down the slip 8, because the conical hole 7 is wide at the top and narrow at the bottom, as the slip 8 continuously descends along the conical hole 7, the slip 8 continuously clamps the coiled tubing 24, after knocking into position, the lower end of the first threaded bolt 11 is threadedly connected to the threaded counterbore through the through hole 22, and the first locking nut 12 is threadedly connected to the upper end of the first threaded bolt 11, thereby locking the slip 8 to ensure that the coiled tubing 24 does not move upward, then the I-shaped flange 2 is fixedly installed on the top of the cone seat flange 1, and then the first sealing packing 3, the first compression cap 5, the second sealing packing 4 and the second compression cap 6 are sequentially installed, at this time, the first sealing packing 3 and the second sealing packing 4 are sleeved on the outside of the coiled tubing 24 to realize double sealing, thereby realizing reliable suspension and sealing of the coiled tubing 24, in addition, a closed annular chamber is formed between the outer wall of the coiled tubing 24, the first sealing packing 3, the second sealing packing 4 and the inner wall of the first compression cap 5, the inner end of the pressure test channel 13 and the annular chamber are communicated, the outer end of the pressure test channel 13 and the annular cavity 14 are communicated, after the top of the I-shaped flange 2 and the upper flange of the Christmas tree are fixedly installed together, the annular cavity 14 and the pressure test structure in the upper flange of the Christmas tree are communicated, thereby the sealing reliability can be tested. In the present application, the coiled tubing 24 is clamped by the split slip, the suspension reliability of the coiled tubing 24 is good, double sealing is realized by the first sealing packing 3 and the second sealing packing 4, the sealing reliability is good, the sealing reliability can be tested by the arrangement of the pressure test channel 13 and the annular cavity 14, in addition, the split slip is arranged in a split manner, after the coiled tubing 24 is lowered into the well, it is installed in the conical hole 7, thereby not only not hindering the large-diameter tool from being lowered into the well, but also not needing to cut the coiled tubing 24 string.

[0023] The above embodiments can be further optimized or / and improved according to actual needs:

[0024] As shown in the accompanying drawings Figures 1-4As shown, the inner wall of the slip pad 8 at the position corresponding to the lower side of the inner ring groove 15 is provided with a protruding tooth 23, and the slip pad 8 is provided with a plurality of vertical fine grooves 16 along the circumference at the position corresponding to the lower side of the outer ring platform 9, and the lower end of the fine groove 16 extends to the bottom end of the slip pad 8. The bottom of the special tool for knocking down the slip pad 8 is a semicircular ring shape matched with the inner ring groove 15, so that when the slip pad 8 is knocked down, the bottom of the special tool is seated on the bottom wall of the inner ring groove 15, the top of the special tool is knocked down, the force is transmitted to the bottom wall of the inner ring groove 15, and then the slip pad 8 is moved downward to continuously hold the coiled tubing 24; by providing the protruding tooth 23, the friction between the slip pad 8 and the coiled tubing 24 is large when the slip pad 8 holds the coiled tubing 24, which can effectively prevent the relative displacement between the two; because the taper hole 7 is wide at the top and narrow at the bottom, the deformation amount of the slip pad 8 increases as it moves downward, and the fine groove 16 provides space for the deformation of the slip pad 8, ensuring that the inner diameter of the slip pad 8 can continuously decrease as it moves downward along the taper hole 7, thereby holding the coiled tubing 24. Specifically, in this embodiment, the slip pad 8 is provided with two vertical fine grooves 16 along the circumference at the position corresponding to the lower side of the outer ring platform 9.

[0025] As shown in the accompanying drawings, Figure 1 The outer side of the first pressure cap 5 is stepped from large at the top to small at the bottom, the first ring groove is stepped to match the outer side of the first pressure cap 5, and the lower outer side of the first pressure cap 5 and the lower inner wall of the first ring groove are threadedly connected together. The outer side of the first pressure cap 5 includes a first upper circumferential surface, a first stepped surface, and a first lower circumferential surface, the first stepped surface is connected to the first upper circumferential surface and the first lower circumferential surface, the first lower circumferential surface is provided with connecting threads, the inner wall of the first ring groove includes a second upper circumferential surface, a second stepped surface, and a second lower circumferential surface, the second stepped surface is connected to the second upper circumferential surface and the second lower circumferential surface, the second lower circumferential surface is provided with connecting threads, the first lower circumferential surface and the second lower circumferential surface are threadedly connected together, the first stepped surface is seated on the second stepped surface, the diameter of the first upper circumferential surface is smaller than the diameter of the second upper circumferential surface, thereby forming an annular cavity 14 with a closed bottom and an open top between the first upper circumferential surface and the second upper circumferential surface.

[0026] As shown in the accompanying drawings, Figure 1 The upper and lower sides of the first sealing packing 3 are respectively provided with a first gasket ring 17, and the upper and lower sides of the second sealing packing 4 are respectively provided with a second gasket ring 18.

[0027] As shown in the accompanying drawings, Figure 1As shown, the conical seat flange 1 and the I-shaped flange 2 are fixedly installed together through the second tapping bolt 19 and the second locking nut 20, and the sealing ring 21 is tightly pressed between the top of the conical seat flange 1 and the bottom of the I-shaped flange 2. Specifically, the upper and lower ends of the second tapping bolt 19 are respectively threadedly connected with the second locking nut 20. In the installation and use, first, the bottom of the conical seat flange 1 and the top of the wellhead tubing head are fixedly installed together through the second tapping bolt 19 and the second locking nut 20, then the second locking nut 20 at the upper end of the second tapping bolt 19 is unscrewed, the I-shaped flange 2 is aligned and installed to the top of the conical seat flange 1, at this time, the second tapping bolt 19 is arranged in the bolt installation hole of the I-shaped flange 2, and the second locking nut 20 is screwed on the upper end of the second tapping bolt 19, thereby the top of the conical seat flange 1 and the bottom of the I-shaped flange 2 are fixedly installed together, and through the sealing ring 21, the sealing connection between the conical seat flange 1 and the I-shaped flange 2 is realized.

[0028] As shown in the accompanying drawings, Figure 1 The bottom of the conical seat flange 1 and the top of the wellhead tubing head are sealingly connected, and the top of the I-shaped flange 2 and the bottom of the upper flange of the Christmas tree are sealingly connected.

[0029] The above technical features constitute the best embodiment of the present application, which has strong adaptability and best implementation effect, and unnecessary technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A CCUS coiled tubing injection wellhead device, characterized in that... The system includes a split slip, a tapered flange, an H-beam flange, a first sealing packing, a second sealing packing, a first pressure cap, and a second pressure cap. The lower end of the H-beam flange and the upper end of the tapered flange are sealed together, and the inner bores of the H-beam flange and the tapered flange are vertically connected. The upper part of the inner bore of the tapered flange is a truncated cone hole, wider at the top and narrower at the bottom. A split slip is installed inside the truncated cone hole for fitting onto the outside of the coiled tubing. The split slip includes two slip pieces distributed circumferentially and whose outer sides are adapted to the truncated cone hole. Each slip piece has a semi-circular outer ring platform on its upper outer side. An outer ring groove is provided on the upper inner wall of the truncated cone hole corresponding to the position of the outer ring platform. The outer ring platform is located within the outer ring groove, and a through hole is provided on the outer ring platform. A threaded countersunk hole is provided on the bottom wall of the outer ring groove corresponding to the position of the through hole. A first threaded bolt is threaded into the countersunk hole, and the first threaded bolt... The upper end is threaded through the through hole and connected to the first locking nut; the upper inner side of the I-beam flange is provided with a first annular groove and a second annular groove from top to bottom. The second annular groove is provided with a first sealing packing for sealing the outside of the coiled tubing. The first annular groove is fixedly installed with a first pressure cap for pressing the first sealing packing. The upper inner side of the first pressure cap is provided with a third annular groove and a fourth annular groove from top to bottom. The fourth annular groove is provided with a second sealing packing for sealing the outside of the coiled tubing. The fourth annular groove is fixedly installed with a second pressure cap for pressing the second sealing packing. The inner wall of the first pressure cap, corresponding to the position between the first and second sealing packings, is provided with a test pressure channel that runs through both inside and outside. The upper outer side of the first pressure cap and the upper inner wall of the first annular groove form an annular cavity that is closed at the bottom and open at the top. The outer end of the test pressure channel is connected to the annular cavity.

2. The CCUS coiled tubing injection wellhead device according to claim 1, characterized in that... Each of the cladding pieces has a semi-circular inner ring groove on its upper inner side. The inner wall of the cladding piece corresponding to the lower side of the inner ring groove has protruding teeth. The cladding piece corresponding to the lower side of the outer ring platform has several vertical fine slots along the circumference, with the lower end of the fine slots extending to the bottom of the cladding piece.

3. The CCUS coiled tubing injection wellhead device according to claim 1 or 2, characterized in that... The outer side of the first pressure cap is stepped, wider at the top and narrower at the bottom. The first annular groove is stepped and adapted to the outer side of the first pressure cap. The lower outer side of the first pressure cap and the lower inner wall of the first annular groove are threaded together.

4. The CCUS coiled tubing injection wellhead device according to claim 1 or 2, characterized in that... The first sealing packing has a first gasket on its upper and lower sides respectively, and the second sealing packing has a second gasket on its upper and lower sides respectively.

5. The CCUS coiled tubing injection wellhead device according to claim 3, characterized in that... The first sealing packing has a first gasket on its upper and lower sides respectively, and the second sealing packing has a second gasket on its upper and lower sides respectively.

6. The CCUS coiled tubing injection wellhead device according to claim 1, 2, or 5, characterized in that... The tapered flange and the I-beam flange are fixed together by a second threaded bolt and a second locking nut, and a sealing ring is pressed between the top of the tapered flange and the bottom of the I-beam flange.

7. The CCUS coiled tubing injection wellhead device according to claim 3, characterized in that... The tapered flange and the I-beam flange are fixed together by a second threaded bolt and a second locking nut, and a sealing ring is pressed between the top of the tapered flange and the bottom of the I-beam flange.

8. The CCUS coiled tubing injection wellhead device according to claim 4, characterized in that... The tapered flange and the I-beam flange are fixed together by a second threaded bolt and a second locking nut, and a sealing ring is pressed between the top of the tapered flange and the bottom of the I-beam flange.

9. The CCUS coiled tubing injection wellhead device according to claim 1, 2, 5, 7, or 8, characterized in that... Sealing rings are provided at the bottom of the tapered flange and at the top of the I-beam flange.

10. The CCUS coiled tubing injection wellhead device according to claim 3, characterized in that... Sealing rings are provided at the bottom of the tapered flange and at the top of the I-beam flange.

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