CN203175416U - Improved tubing head for low pressure sour gas well remediation - Google Patents
Improved tubing head for low pressure sour gas well remediation Download PDFInfo
- Publication number
- CN203175416U CN203175416U CN 201320067644 CN201320067644U CN203175416U CN 203175416 U CN203175416 U CN 203175416U CN 201320067644 CN201320067644 CN 201320067644 CN 201320067644 U CN201320067644 U CN 201320067644U CN 203175416 U CN203175416 U CN 203175416U
- Authority
- CN
- China
- Prior art keywords
- head
- tubing head
- oil pipe
- low pressure
- gas well
- 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 - Fee Related
Links
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title description 17
- 238000005067 remediation Methods 0.000 title 1
- 239000002253 acid Substances 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims description 18
- 150000001875 compounds Chemical class 0.000 claims description 8
- 239000002184 metal Substances 0.000 abstract description 12
- 229910052751 metal Inorganic materials 0.000 abstract description 12
- 239000011148 porous material Substances 0.000 abstract 3
- 230000002349 favourable effect Effects 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 23
- 238000004519 manufacturing process Methods 0.000 description 19
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000003921 oil Substances 0.000 description 6
- 241000191291 Abies alba Species 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- WPOOICLZIIBUBM-UHFFFAOYSA-H iron;iron(3+);methyl-dioxido-oxo-$l^{5}-arsane Chemical compound [Fe].[Fe+3].[Fe+3].C[As]([O-])([O-])=O.C[As]([O-])([O-])=O.C[As]([O-])([O-])=O WPOOICLZIIBUBM-UHFFFAOYSA-H 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 239000002341 toxic gas Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Landscapes
- Pipe Accessories (AREA)
Abstract
The utility model provides a be used for prosthetic modified oil pipe head of low pressure acid gas well, this oil pipe head be a hollow joint, and both ends are formed with a ring flange respectively about it, and wherein, the concave seal groove that is equipped with on the inner wall of this oil pipe head, seal groove department inlays and is equipped with a rubber seal, and along radially further forming one notes fat pore on the lateral wall of this oil pipe head, the inner port that should annotate the fat pore is linked together with this seal groove, and its outer port department then is equipped with a sealed end cap, it is filled with sealed fat to annotate the fat pore. The utility model discloses a be used for prosthetic modified oil pipe head of low pressure acid gas well is favorable to protecting oil pipe head, casing head and metal seal between the two, improves well head integrality, is favorable to the safe exploitation acid gas field.
Description
Technical field
The utility model relates to a kind of tubing head structure, especially a kind of improved tubing head for the reparation of low pressure acid gas well.
Background technology
Wellhead assembly is the visual plant of production of hydrocarbons, formed by casing head, tubing head and christmas tree three parts, its effect has three aspects: the one, form a complete oil gas control system with pit shaft, and the 2nd, the flow of the pressure of monitoring production wellhead and adjusting gas well; The 3rd, for various measure operations such as acid fracturing, tests.Not only be subjected to the corrosion of atmosphere and soil owing to wellhead assembly in the oil gas well mining process, and be subjected to erosion and the corrosion of hydraulic oil air-flow, the wellhead assembly of long-term shut-in well then mainly is subjected to the corrosion of atmosphere and soil; If the wellhead assembly of the oldish well of a bite is damaged, just need repair it, guarantee mining operations normally.Existing wellhead assembly recovery technique generally is to repair or change broken parts, if wellhead assembly suffers badly damaged, replaceable new tubing head and christmas tree, but this mode only is applicable to the situation that casing head, tubing head and christmas tree match, can not change original hermetically-sealed construction, not reach the purpose that improves the gas well integrality.If the oil gas well deadline is long, original casing head, tubing head and christmas tree and existingly differ greatly in structure and standard, requirements such as original structure and sealing can not reach existing technical standard and standard, and then existing well head recovery technique is just inapplicable;
Especially sour gas Tanaka, owing to contain hydrogen sulfide and carbon dioxide in the natural gas, they have strong corrosivity and toxic; Longer service time when original wellhead assembly, and there is heavy corrosion and when damaging, the wellhead assembly that need more renew; Casing head can't be changed but the casing head of gas well has been connected one with sleeve pipe, then tubing head and christmas tree can only be changed.Referring to Fig. 1, original wellhead assembly has only the metal sealing at tubing head with casing head, the surplus height of production casing on the CHF face is very limited, if directly utilize existing tubing head to change, then has only metal sealing 13 at tubing head 11 between casing head 12; When there is sour gas in annular space 16 between oil pipe 14 and the production casing 15, it just can invade in the metal seal groove of metal sealing 13 and with steel ring 131 and contact, cause sour gas that steel ring is corroded, may cause well head risk out of control, thereby cause the serious security incident that the hydrogen sulfide toxic gas leaks.Because the raising of the relevant criterion of acid gas well now, the integrality of well head and pit shaft is required stricter, need existing well head recovery technique to improve and improve, so that satisfying, the well head after repairing has the requirement that acid gas well is exploited now.
In view of this, the design people develops a kind of improved tubing head for the reparation of low pressure acid gas well according to the production design experiences of being engaged in this area and association area for many years, in the hope of solving the problem that prior art exists.
The utility model content
The purpose of this utility model is to be to provide a kind of improved tubing head for the reparation of low pressure acid gas well, is conducive to protect tubing head, casing head and the sealing of metal between the two, satisfies the requirement that sour gas neoasozin standard-sized sheet is adopted.
For this reason, the utility model proposes a kind of improved tubing head for the reparation of low pressure acid gas well, this tubing head is a hollow joint, it is formed with a flange respectively in two ends up and down, wherein, be concaved with a seal groove on the inwall of this tubing head, described seal groove place is embedded with a rubber seal, radially further form a greasing duct on the sidewall of this tubing head, the inner port in this greasing duct is connected with the sealing groove, its external port place then is provided with a seal plug, and described greasing is filled with stop-leak compound in the duct.
The improved tubing head that is used for the reparation of low pressure acid gas well that the utility model proposes; by seal groove and rubber seal are set; the external surface of rubber seal and production casing connects airtight mutually when work; thereby form sealing together; avoid metal sealing place between sour gas intrusion tubing head and the casing head; be conducive to protect tubing head, casing head and the sealing of metal between the two (as steel ring); can effectively prevent because sour gas corrodes steel ring, can avoid the well head serious security incident that causes the hydrogen sulfide toxic gas to leak out of control.
The improved tubing head that is used for the reparation of low pressure acid gas well that the utility model proposes, be on the basis of original wellhead assembly structure, the structure of existing tubing head to be improved, in the well head repair process, be formed with sealing between the production casing of tubing head of the present utility model in being located in casing head, so not only satisfy existing wellhead assembly relevant criterion and standard, improve the gas well integrality, and satisfied the requirement that sour gas neoasozin standard-sized sheet is adopted.
Description of drawings
The use reference diagram that Fig. 1 is connected with casing head for existing tubing head.
Fig. 2 is the use reference diagram that tubing head of the present utility model is connected with casing head.
Fig. 3 is the partial enlarged drawing at H place among Fig. 2.
The critical element label declaration:
11 tubing heads, 12 casing heads
13 metals seal 131 steel rings
14 oil pipes, 15 production casings
16 annular spaces, 2 tubing heads
21 flange, 22 seal grooves
23 rubber seal, 24 greasing ducts
25 seal plugs
The specific embodiment
Understand for technical characterictic of the present utility model, purpose and effect being had more clearly, now contrast the description of drawings specific embodiment of the present utility model, wherein, identical parts adopt identical label.
Fig. 2 is the use reference diagram that tubing head of the present utility model is connected with casing head.Fig. 3 is the partial enlarged drawing at H place among Fig. 2.
As Fig. 2, shown in Figure 3, the improved tubing head that is used for the reparation of low pressure acid gas well that the utility model proposes, this tubing head 2 is a hollow joint, it is formed with a flange 21 respectively in two ends up and down, wherein, be concaved with a seal groove 22 on the inwall of this tubing head 2, described seal groove 22 places are embedded with a rubber seal 23, radially further form a greasing duct 24 on the sidewall of this tubing head 2, the inner port in this greasing duct 24 is connected with sealing groove 22, its external port place then is provided with a seal plug 25, is filled with stop-leak compound in the described greasing duct 24.Wherein, as shown in the figure, preferably the inner port in this greasing duct 24 is positioned at the place, middle part of sealing groove 22 bottom lands.
It is to be noted, when well workover, measure the surplus height that production casing stretches out the flange face of casing head upper end earlier, and according to the surplus height of production casing, seal groove of proper height place processing and greasing duct on the tubing head inwall form one rubber seal to utilize sealing groove and rubber seal; And utilize the greasing duct to annotate the stop-leak compound of certain pressure, just can make this rubber seal form the sealing of certain pressure by stop-leak compound.Wherein, can bear at production casing under the condition of greasing pressure, sealing load just equals greasing pressure.In addition, for the seal request that both guarantees the normal exploitation of gas well guarantees that again production casing can bear greasing pressure, the greasing pressure of stop-leak compound (is the greasing pressure P
Annotate) equal 1.25 times of maximum wellhead pressure (P
Max, it can obtain according to calculation of parameter such as gas-bearing formation pressure, buried depth and gas densities), the pressure of greasing simultaneously is not more than the maximum anti-internal pressure (P of production casing
In, it can check in according to the grade of steel wall thickness of production casing in the casing head) 80%, i.e. P
Annotate=1.25P
Max, and P
Annotate≤ 0.8P
In
Referring to Fig. 2, the improved tubing head that is used for the reparation of low pressure acid gas well that the utility model proposes, in concrete enforcement, it is connected and fixed by flange and production tree (not shown) and casing head respectively at two ends up and down, and between the card of the flange of its lower end and the upper surface of casing head, then (this structure is same as the prior art to form the metal sealing by being embedded steel ring, do not giving unnecessary details), and the production casing post in the casing head upwards stretches in the tubing head, and the rubber seal in the seal groove of its external surface and tubing head is relative to seal contact, and forms one rubber seal under the effect of stop-leak compound.If there is sour gas to exist in the annular space between oil pipe and production casing; this rubber seal can stop sour gas to flow downward along the space between production casing and the tubing head; the metal of avoiding sour gas to invade between tubing head and the casing head seals; be conducive to protect tubing head, casing head and steel ring; can improve the wellhead assembly integrality; can effectively prevent because sour gas corrodes steel ring again, thereby avoid the well head serious security incident that causes the hydrogen sulfide toxic gas to leak out of control.
The improved tubing head that is used for the reparation of low pressure acid gas well that the utility model proposes; by seal groove and rubber seal are set; rubber seal and production casing external surface connects airtight mutually when work; add that stop-leak compound forms one rubber seal; be conducive to protect the metal sealing between tubing head and the casing head; improve the integrality of gas well mouth, satisfied the requirement that sour gas neoasozin standard-sized sheet is adopted.
The above only is the schematic specific embodiment of the utility model, is not in order to limit scope of the present utility model.Any those skilled in the art, the equivalent variations of having done under the prerequisite that does not break away from design of the present utility model and principle and modification all should belong to the scope that the utility model is protected.
Claims (1)
1. one kind is used for the improved tubing head that the low pressure acid gas well is repaired, this tubing head is a hollow joint, it is formed with a flange respectively in two ends up and down, it is characterized in that be concaved with a seal groove on the inwall of this tubing head, described seal groove place is embedded with a rubber seal, radially further form a greasing duct on the sidewall of this tubing head, the inner port in this greasing duct is connected with the sealing groove, and its external port place then is provided with a seal plug, and described greasing is filled with stop-leak compound in the duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320067644 CN203175416U (en) | 2013-02-05 | 2013-02-05 | Improved tubing head for low pressure sour gas well remediation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320067644 CN203175416U (en) | 2013-02-05 | 2013-02-05 | Improved tubing head for low pressure sour gas well remediation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203175416U true CN203175416U (en) | 2013-09-04 |
Family
ID=49072131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320067644 Expired - Fee Related CN203175416U (en) | 2013-02-05 | 2013-02-05 | Improved tubing head for low pressure sour gas well remediation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203175416U (en) |
-
2013
- 2013-02-05 CN CN 201320067644 patent/CN203175416U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20220205 |