CA2341139C - Wellhead production pumping tree - Google Patents
Wellhead production pumping tree Download PDFInfo
- Publication number
- CA2341139C CA2341139C CA 2341139 CA2341139A CA2341139C CA 2341139 C CA2341139 C CA 2341139C CA 2341139 CA2341139 CA 2341139 CA 2341139 A CA2341139 A CA 2341139A CA 2341139 C CA2341139 C CA 2341139C
- Authority
- CA
- Canada
- Prior art keywords
- bore
- connection
- housing
- tree
- tubing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005086 pumping Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000002131 composite material Substances 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000037431 insertion Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 210000003739 neck Anatomy 0.000 description 3
- 210000002445 nipple Anatomy 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 101100126130 Escherichia coli O111:H- insE gene Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/068—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
A monolithic pumping tree combining a bottom connection, production blow-out preventer section, flow tee section and top connection is cast so as to provide an access port extending downwardly through the side wall of the tree from its outer surface, to connect with either the central vertical bore of the tree or its horizontal bottom surface, thereby enabling coiled tubing to be inserted either into the tubing string bore or into the annulus between the tubing and production casing strings.
Description
1 (FIELD OF THE INVENTION
2 The present invention relates to a wellhead component having an
3 access port through which coiled tubing can be inserted into the bore of the
4 tubing string or, alternatively, into the annulus between the tubing string and the production casing of a well.
7 B~4C~CGROUND OF THE INVENTION
8 Canadian patent No. 2,197,584 discloses a wellhead component which 9 is referred to as a composite pumping tree. This pumping tree is shown in Figure 1. It typically is used by incorporating it into a wellhead equipped with 11 a rotary drive assembly for rotating a rod string connected with a downhole 12 rotary or screw pump (seE: Figures 4 and 5).
13 This known pumping tree a comprises a monolithic housing b formed 14 from a single piece of stE:el. It may be forged or cast. The housing has a vertical bore c extending therethrough and comprises:
16 ~ a bottom connection d, which can be studded or flanged or of the 17 threaded ring o~r clamp and hub type. The bottom connection is 18 operative to connect with the top connection of the wellhead tubing 19 head;
~ a production blowout preventer ("BOP") housing section a forming 21 side openings f communicating with the vertical bore c, for receiving 22 the ram components g of a BOP;
23 ~ a flow tee section h forming at least one side opening i 24 communicating with the bore c, for producing well fluid; and 1 ~ a top connection j, preferably studded and internally threaded, for 2 connecting with the stuffing box and frame of a rotary drive 3 assembly for sE:aling and rotating the rod string.
4 The pumping tree a is free of narrow necks and has a substantially consistently thick side wall k.
6 The wellhead as:>embly shown in Figure 1 is commonly used in 7 connection with wells producing heavy oil from a sand formation. With some 8 of these wells it is necessary to periodically insert a small diameter coiled 9 tubing string into the production tubing string bore or into the annulus between the tubing string and the production casing. This may be done, for example, 11 for the purpose of circulating fluid through the well to wash out sand bridges 12 or plugs which have built up downhole. Alternatively, there are also occasions 13 when it may be desirable to run pressure or temperature measuring 14 instruments into the well o~n coiled tubing.
In the past, when a coiled tubing string or instrumentation string was to 16 be run into a well, it was the conventional practice:
17 ~ to unbolt and remove the rotary drive assembly; and 18 ~ then mount a special spool in its place, the spool having one or 19 more angled :>ide ports through which the coiled tubing or instrumentation string could be inserted.
21 This prior practice was time consuming and involved cost. It also 22 produced a relatively highs assembly which a service rig might not correlate 23 with.
2 In accordance with the present invention, a composite pumping tree is 3 modified by providing an access port extending inwardly and downwardly 4 through the side wall from the tree's outer surface to either the vertical bore or to the tree's bottom surface. The access port terminating at the vertical bore 6 makes it possible to insE~rt a coiled tubing string into the bore of the tubing 7 string. The access port terminating at the bottom surface of the tree, when 8 coupled with an opening extending through the tubing string hanger, enables 9 insertion of coiled tubing into the annulus between the production casing and tubing string. Preferably an inlet pipe extends upwardly and outwardly from 11 the access port. The inlet pipe may be a nipple threaded into the access port 12 or it may be integral with the tree. A control valve is mounted to the inlet pipe.
13 The main advantages of the assembly are that:
14 ~ it does away with the need to first remove the bulky rotary drive assembly and then insert a spool, when coiled tubing is to be 16 inserted; and 17 ~ it keeps the access port relatively low, so that the service rig 13 equipment is better able to work with it.
DESCRIPTION OF THE DRAWINGS
21 Figure 1 is a partly cross-sectional side view of a prior art composite 22 pumping tree;
1 Figure 2 is a cros;s-sectional side view of a composite pumping tree in 2 accordance with the invention, equipped with an access port and an inlet pipe 3 for enabling insertion of coiled tubing into the bore of a tubing string;
4 Figure 3 is a cross-sectional side view of a tree equipped with an access port and an inlet pipe for enabling insertion of coiled tubing into the 6 annulus between the tubing and production casing strings;
7 Figure 4 is a cro~~s-sectional side view showing the tree of Figure 2 8 forming part of a wellhead with a string of coiled tubing extending through the 9 access port into the bore of the tubing string; and Figure 5 is a cross-sectional side view showing the tree of Figure 3 11 forming part of a wellhead with a string of coiled tubing extending through the 12 access port into the annulus.
Having reference to the Figures, the composite pumping tree 1 is 16 forged or cast as a monolithic unit formed from a single piece of steel.
The 17 tree 1 comprises a housing 2 having a vertical bore 3 extending therethrough.
18 The housing 2 comprises a bottom connection 4, a BOP housing section 5, a 19 flow tee section 6, a top connection 7 and an access port 8 and inlet pipe 9.
The bottom connection 4 is flanged and studded. It is adapted to 21 connect and seal with the top connection 10 of a tubing head 11 forming part 22 of a conventional pumping wellhead 12 of a well 13. The bottom face 14 of 23 the bottom connection 4 iforms a ring seal groove 15, extending around the 24 vertical bore 3, for receiving a seal ring 16. The body of the connection 4
7 B~4C~CGROUND OF THE INVENTION
8 Canadian patent No. 2,197,584 discloses a wellhead component which 9 is referred to as a composite pumping tree. This pumping tree is shown in Figure 1. It typically is used by incorporating it into a wellhead equipped with 11 a rotary drive assembly for rotating a rod string connected with a downhole 12 rotary or screw pump (seE: Figures 4 and 5).
13 This known pumping tree a comprises a monolithic housing b formed 14 from a single piece of stE:el. It may be forged or cast. The housing has a vertical bore c extending therethrough and comprises:
16 ~ a bottom connection d, which can be studded or flanged or of the 17 threaded ring o~r clamp and hub type. The bottom connection is 18 operative to connect with the top connection of the wellhead tubing 19 head;
~ a production blowout preventer ("BOP") housing section a forming 21 side openings f communicating with the vertical bore c, for receiving 22 the ram components g of a BOP;
23 ~ a flow tee section h forming at least one side opening i 24 communicating with the bore c, for producing well fluid; and 1 ~ a top connection j, preferably studded and internally threaded, for 2 connecting with the stuffing box and frame of a rotary drive 3 assembly for sE:aling and rotating the rod string.
4 The pumping tree a is free of narrow necks and has a substantially consistently thick side wall k.
6 The wellhead as:>embly shown in Figure 1 is commonly used in 7 connection with wells producing heavy oil from a sand formation. With some 8 of these wells it is necessary to periodically insert a small diameter coiled 9 tubing string into the production tubing string bore or into the annulus between the tubing string and the production casing. This may be done, for example, 11 for the purpose of circulating fluid through the well to wash out sand bridges 12 or plugs which have built up downhole. Alternatively, there are also occasions 13 when it may be desirable to run pressure or temperature measuring 14 instruments into the well o~n coiled tubing.
In the past, when a coiled tubing string or instrumentation string was to 16 be run into a well, it was the conventional practice:
17 ~ to unbolt and remove the rotary drive assembly; and 18 ~ then mount a special spool in its place, the spool having one or 19 more angled :>ide ports through which the coiled tubing or instrumentation string could be inserted.
21 This prior practice was time consuming and involved cost. It also 22 produced a relatively highs assembly which a service rig might not correlate 23 with.
2 In accordance with the present invention, a composite pumping tree is 3 modified by providing an access port extending inwardly and downwardly 4 through the side wall from the tree's outer surface to either the vertical bore or to the tree's bottom surface. The access port terminating at the vertical bore 6 makes it possible to insE~rt a coiled tubing string into the bore of the tubing 7 string. The access port terminating at the bottom surface of the tree, when 8 coupled with an opening extending through the tubing string hanger, enables 9 insertion of coiled tubing into the annulus between the production casing and tubing string. Preferably an inlet pipe extends upwardly and outwardly from 11 the access port. The inlet pipe may be a nipple threaded into the access port 12 or it may be integral with the tree. A control valve is mounted to the inlet pipe.
13 The main advantages of the assembly are that:
14 ~ it does away with the need to first remove the bulky rotary drive assembly and then insert a spool, when coiled tubing is to be 16 inserted; and 17 ~ it keeps the access port relatively low, so that the service rig 13 equipment is better able to work with it.
DESCRIPTION OF THE DRAWINGS
21 Figure 1 is a partly cross-sectional side view of a prior art composite 22 pumping tree;
1 Figure 2 is a cros;s-sectional side view of a composite pumping tree in 2 accordance with the invention, equipped with an access port and an inlet pipe 3 for enabling insertion of coiled tubing into the bore of a tubing string;
4 Figure 3 is a cross-sectional side view of a tree equipped with an access port and an inlet pipe for enabling insertion of coiled tubing into the 6 annulus between the tubing and production casing strings;
7 Figure 4 is a cro~~s-sectional side view showing the tree of Figure 2 8 forming part of a wellhead with a string of coiled tubing extending through the 9 access port into the bore of the tubing string; and Figure 5 is a cross-sectional side view showing the tree of Figure 3 11 forming part of a wellhead with a string of coiled tubing extending through the 12 access port into the annulus.
Having reference to the Figures, the composite pumping tree 1 is 16 forged or cast as a monolithic unit formed from a single piece of steel.
The 17 tree 1 comprises a housing 2 having a vertical bore 3 extending therethrough.
18 The housing 2 comprises a bottom connection 4, a BOP housing section 5, a 19 flow tee section 6, a top connection 7 and an access port 8 and inlet pipe 9.
The bottom connection 4 is flanged and studded. It is adapted to 21 connect and seal with the top connection 10 of a tubing head 11 forming part 22 of a conventional pumping wellhead 12 of a well 13. The bottom face 14 of 23 the bottom connection 4 iforms a ring seal groove 15, extending around the 24 vertical bore 3, for receiving a seal ring 16. The body of the connection 4
5 1 forms threaded bolt holes (not shown) for receiving connecting studs 18. The 2 bottom connection 4 en<~bles mounting of the pumping tree 1 to the tubing 3 head 11.
4 The BOP housing section 5 extends up from the bottom connection 4.
As shown, the BOP housing section 5 is contiguous with the bottom
4 The BOP housing section 5 extends up from the bottom connection 4.
As shown, the BOP housing section 5 is contiguous with the bottom
6 connection 4 so that there is no narrowing neck between them. The section 5
7 forms diametrically aligned side openings 19 communicating or connecting
8 with the vertical bore 3. The side openings 19 are internally threaded and
9 formed to receive the rams components 20 of a side-opening production BOP.
The flow tee section 6 extends up from the BOP housing section 5. As 11 shown, the BOP housing section 5 is contiguous with the flow tee section 6 so 12 that there is no narrowing neck between them. The flow tee section 6 forms 13 internally threaded side openings 21 communicating with the vertical bore 3.
14 The side openings 21 form outlet means for tying in to a flow line 60, through which well fluid is produced.
16 A studded top connection 7 extends up from the flow tee section 6.
17 The end face 22 of the top connection 7 forms a ring seal groove 23 for 18 receiving ring seal 26. The body of the top connection 7 is preferably 19 internally threaded and forms threaded bolt holes 24 for receiving studs 25.
The top connection 7 is adapted to seal and connect with stuffing box 27 and 21 frame 28 of a rotary drive assembly 29.
22 The top connection 7 may have a smaller diameter than the main body 23 of housing 2 and therefore forms a shoulder 30 therewith.
1 In one embodiment of the invention, shown in Figure 2, an angled 2 access port 8 extends downwardly and inwardly through the housing side wall 3 43 from the housing's ouster side surface 32, commencing at the shoulder 30, 4 to connect or communicate with the vertical bore 3. A pipe 33 extends upwardly and outwardly from the shoulder 30, to form an extension of the 6 access port 8. The pipe 33 may be formed as part of the casting or forging or 7 may be a separate nipple. The pipe 33 has a studded flanged connection 34 8 at its upper end. The end face 35 of the connection 34 forms a ring seal 9 groove 36 for receiving seal ring (not shown). The body of the connection 34 forms threaded bolt hole:; 37 for receiving studs for attaching the connection 11 34 with a control valve (not shown).
12 As shown in Figure 4, coiled tubing 40 can be inserted through the 13 control valve, pipe 33 and access part 8, to enter the bore 41 of a tubing string 14 42 suspended from the wellhead 12. This can be accomplished without removing the rotary drive assembly 29.
16 In another embodirnent of the invention, shown in Figure 3, an access 17 port 8 extends down, through the housing side wall 43, from the housing's 18 outer side surface 32 and terminates at the bottom end face 14 of the bottom 19 connection 4, inwardly of the seal ring 16. A pipe 33, as previously described, extends up from the acceas port 8. As shown in Figure 5, the access port 8 21 enables coiled tubing 40 t~o extend down through an opening 52 in the tubing 22 string hanger 53, so as to enter the annulus 54 between the tubing string 23 and the production casing string 55.
1 The Figures and description set forth applicants' best modes of the 2 invention. However those skilled in the art will realize that various alterations 3 can be made without altering the substance of the invention. For example, a 4 ring-type connection can be substituted for the studded bottom connection.
The scope of the invention is set forth in the claims now following:
The flow tee section 6 extends up from the BOP housing section 5. As 11 shown, the BOP housing section 5 is contiguous with the flow tee section 6 so 12 that there is no narrowing neck between them. The flow tee section 6 forms 13 internally threaded side openings 21 communicating with the vertical bore 3.
14 The side openings 21 form outlet means for tying in to a flow line 60, through which well fluid is produced.
16 A studded top connection 7 extends up from the flow tee section 6.
17 The end face 22 of the top connection 7 forms a ring seal groove 23 for 18 receiving ring seal 26. The body of the top connection 7 is preferably 19 internally threaded and forms threaded bolt holes 24 for receiving studs 25.
The top connection 7 is adapted to seal and connect with stuffing box 27 and 21 frame 28 of a rotary drive assembly 29.
22 The top connection 7 may have a smaller diameter than the main body 23 of housing 2 and therefore forms a shoulder 30 therewith.
1 In one embodiment of the invention, shown in Figure 2, an angled 2 access port 8 extends downwardly and inwardly through the housing side wall 3 43 from the housing's ouster side surface 32, commencing at the shoulder 30, 4 to connect or communicate with the vertical bore 3. A pipe 33 extends upwardly and outwardly from the shoulder 30, to form an extension of the 6 access port 8. The pipe 33 may be formed as part of the casting or forging or 7 may be a separate nipple. The pipe 33 has a studded flanged connection 34 8 at its upper end. The end face 35 of the connection 34 forms a ring seal 9 groove 36 for receiving seal ring (not shown). The body of the connection 34 forms threaded bolt hole:; 37 for receiving studs for attaching the connection 11 34 with a control valve (not shown).
12 As shown in Figure 4, coiled tubing 40 can be inserted through the 13 control valve, pipe 33 and access part 8, to enter the bore 41 of a tubing string 14 42 suspended from the wellhead 12. This can be accomplished without removing the rotary drive assembly 29.
16 In another embodirnent of the invention, shown in Figure 3, an access 17 port 8 extends down, through the housing side wall 43, from the housing's 18 outer side surface 32 and terminates at the bottom end face 14 of the bottom 19 connection 4, inwardly of the seal ring 16. A pipe 33, as previously described, extends up from the acceas port 8. As shown in Figure 5, the access port 8 21 enables coiled tubing 40 t~o extend down through an opening 52 in the tubing 22 string hanger 53, so as to enter the annulus 54 between the tubing string 23 and the production casing string 55.
1 The Figures and description set forth applicants' best modes of the 2 invention. However those skilled in the art will realize that various alterations 3 can be made without altering the substance of the invention. For example, a 4 ring-type connection can be substituted for the studded bottom connection.
The scope of the invention is set forth in the claims now following:
Claims (3)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS
FOLLOWS:
1. A composite pumping tree for use in a wellhead between a tubing head top connection and the bottom connection of a pump drive and seal assembly, said wellhead supporting a tubing string having a bore and being connected with production casing, whereby the casing cooperates with the tubing string to form an annulus, comprising:
a housing formed from a single piece of steel, said housing forming a vertical bore extending therethrough and having a side wall and an outer side surface, said housing further comprising a bottom connection for connecting with the tubing head top connection, a blow-out preventer housing section forming side openings, communicating with the vertical bore, for receiving the ram components of a blow-out preventer, a flow tee section forming at least one side opening, communicating with the vertical bore, for producing well fluid, a top connection for connecting with the pump drive and seal assembly bottom connection, said housing side wall forming an access port extending inwardly and downwardly therethrough from the housing side surface for connection with the tubing string bore or the annulus.
a housing formed from a single piece of steel, said housing forming a vertical bore extending therethrough and having a side wall and an outer side surface, said housing further comprising a bottom connection for connecting with the tubing head top connection, a blow-out preventer housing section forming side openings, communicating with the vertical bore, for receiving the ram components of a blow-out preventer, a flow tee section forming at least one side opening, communicating with the vertical bore, for producing well fluid, a top connection for connecting with the pump drive and seal assembly bottom connection, said housing side wall forming an access port extending inwardly and downwardly therethrough from the housing side surface for connection with the tubing string bore or the annulus.
2. The pumping tree as set forth in claim 1 wherein:
the access port connects with the vertical bore and therethrough with the tubing string bore.
the access port connects with the vertical bore and therethrough with the tubing string bore.
3. The pumping tree as set forth in claim 1 wherein:
the access port extends to the bottom surface of the pumping tree to enable communication with the annulus.
the access port extends to the bottom surface of the pumping tree to enable communication with the annulus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2341139 CA2341139C (en) | 2001-03-19 | 2001-03-19 | Wellhead production pumping tree |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2341139 CA2341139C (en) | 2001-03-19 | 2001-03-19 | Wellhead production pumping tree |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2341139A1 CA2341139A1 (en) | 2002-09-19 |
| CA2341139C true CA2341139C (en) | 2004-09-14 |
Family
ID=4168640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2341139 Expired - Lifetime CA2341139C (en) | 2001-03-19 | 2001-03-19 | Wellhead production pumping tree |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2341139C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2445443C1 (en) * | 2010-09-14 | 2012-03-20 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Well head fittings |
| RU2494301C1 (en) * | 2012-03-13 | 2013-09-27 | Рафик Хасанович Арифулин | Christmas tree |
-
2001
- 2001-03-19 CA CA 2341139 patent/CA2341139C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2341139A1 (en) | 2002-09-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20210319 |