CN203626623U - Natural gas well annulus protection oil casing with self-sealing capacity - Google Patents
Natural gas well annulus protection oil casing with self-sealing capacity Download PDFInfo
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- CN203626623U CN203626623U CN201320704237.9U CN201320704237U CN203626623U CN 203626623 U CN203626623 U CN 203626623U CN 201320704237 U CN201320704237 U CN 201320704237U CN 203626623 U CN203626623 U CN 203626623U
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Abstract
The utility model relates to a natural gas well annulus protection oil casing with self-sealing capacity. The natural gas well annulus protection oil casing comprises an oil tube, a casing, a separator, a setting ball seat, a side through sliding sleeve, a corrosion and scale inhibitor layer, a seal retarder layer and a liquid covering layer, wherein the oil tube is arranged at the center of the casing pipe; an annulus formed by the oil tube and the casing pipe is filled with the separator, the seal retarder layer, the corrosion and scale inhibitor layer and the liquid covering layer from bottom to top sequentially; the setting ball seat is located in the oil tube and in the position of the delayed sealant layer, the side through sliding sleeve is located on the wall of the oil tube and at the lower end of the corrosion and scale inhibitor layer, and the liquid covering layer is located between a frozen oil layer at the upper part of a well and a wellhead; and the inhibition rate of the oil casing is larger than 98%, the scale inhibiting rate is larger than 95%, the sterilizing rate is 100%, and the deoxygenization rate is 100%.
Description
Technical field
The utility model relates to a kind of natural gas well annular space protection tubing and casing with self sealss ability.
Background technology
Both at home and abroad in gas field development process, for protective casing inwall and oil-pipe external wall are subject to H
2s and CO
2deng corrosion, the normal method adopting has two kinds: the one, possess the hydraulic compression type packer of caulking gum cylinder, and anchor to casing hypomere, expansion packing element is separated the top and the bottom of oil jacket annular space, then tubing and casing upper annulus is injected to efficient protection liquid; The one, the annular space organic inhibitor of regularly annotating.
But the latter's shortcoming is that filling is frequent, it is large that protection effect is affected by pit shaft corrosion factor etc.The former advantage is that sealing effectiveness is better, and degree of protection is high, but under high temperature, condition of high voltage, easily aging after rubber tube and long-time immersion of upper annulus protection liquid.Take conventional acrylonitrile-butadiene rubber as example.In NACE TG086 standard water soluble corrosion inhibitor A, 100 ℃ were soaked after 70 or 168 hours, and hardness, tensile strength etc. all occurs obviously to change, and proves that its sealability is affected.The compound annular protective liquid of Oilfield using is in conjunction with the protected mode of packer set protection oil jacket annular space both at home and abroad for many years, and packing element performance inevitably will reduce on long terms.The packing element life-span is short, leakage is sealed is one of key link affecting reliability of technology.
Polyacrylamide high molecular polymer gel skill is widely used in oilfield chemistry profile control and water plugging technology at present, and it has enough colloid intensity, and has long-time stability, good shear ability etc.In the environment of pit shaft and oil jacket annular space, compliance is stronger, insensitive to factors such as water quality, temperature, pH values.Based on above reason; for packing element life problems, the present invention takes the chemistry take polyacrylamide as main body to become glue to take the mode of action protection packing element of isolating seal not contact the problem that produces sealing performance and decline application life with the corrosion-mitigation scale-inhibition medicament in oil jacket annular space.
Utility model content
The purpose of this utility model is to provide a kind of natural gas well annular space protection tubing and casing with self sealss ability.
Oil pipe and the sleeve pipe of protection gas well, prevent that corrosion from causing cased perforated, and leak under water on outer stratum, or prevent that natural gas from channeling in stratum outward, and protection gas well top tubing string and well head ensure gas well safety in production.
A kind of natural gas well annular space protection tubing and casing with self sealss ability described in the utility model, it comprises: oil pipe, sleeve pipe, separator, setting ball seat, the logical sliding sleeve of side, corrosion inhibiting and descaling agent layer, delay sealant layer, lid liquid layer;
Oil pipe is placed in cover tube hub, the annular space being formed by oil pipe and sleeve pipe is disposed with separator, delay sealant layer, corrosion inhibiting and descaling agent layer and lid liquid layer from the bottom to top, setting ball seat is positioned at oil pipe and postpones sealant layer place, the logical sliding sleeve of side is positioned at corrosion inhibiting and descaling agent layer lower end on tubing wall, between the frozen soil layer and well head of lid liquid layer in aboveground portion.
(1) postponing sealant layer is that polyacrylamide glue forms.
(2) corrosion inhibiting and descaling agent layer is to form containing the aqueous solution of multiple additives.
(3) the liquid-tight degree of cap rock is lower than the liquid-tight degree of first and second segment protect.
(4) postpone sealant layer and corrosion inhibiting and descaling agent interlayer completely not molten altogether, guarantee that layering is obvious
(5) additive is the composite formations of number of chemical preparation such as corrosion inhibiter, scale preventative, bactericide and oxygen scavenger, salt inhibitor, demulsifier.
Polyacrylamide glue is the polyacrylamide of content 0.5～1.2%, the sodium dichromate of content 0.1～0.2%, and the sodium hydrogensulfite of content 0.1～0.4%, all the other form for water stirs.Or the polyacrylamide amine monomers of content 4～12%, content is 0.01～0.05% ammonium persulfate, all the other mix together for water.
Corrosion inhibiter is by one or more compositions of mixtures in ternary quaternary amine, fatty acid amine, quarternary ammonium salt compound, imidazoline, imidazoline salt LCFA, alkyl pyrimidine, thiocarbamide hard soap, and in the aqueous solution, content is 1～5%.
Scale preventative is made up of phosphate, comprises methyl two ethylidene phosphonates, ATMP salt, alkylol phosphoric acid fat sodium salt or one or more compositions.Total two segment protect liquid hold-ups are 0～5%.
Protect the (2) middle oxygen scavenger of liquid by alkali metal sulfite, alkaline-earth metal sulfite, sodium hydrogensulfite, hydrazine, methyl ethyl ketone ester, select one in diethyl dioxide ammonium, and its content is 0～10% of second segment protection liquid total amount.
(2) the middle anti-salt agent of protection liquid, by non-ionic surface active agent, is selected in breaking ethylene glycol, polyethylene glycol and their mixture.Content is second segment protection liquid total amount 0～5%.
Protection liquid (2) in bactericide by the one in secondary amine, quaternary amine, alkyl aldehydes, aryl aldehyde, ethyoxyl hypochlorous acid amine, organic aromatic aldehyde (methylol calcimangite sulfuric acid phosphate).Content is second segment protection liquid total amount 0～5%.
Protection liquid (2) in demulsifier by alkoxyl resin, the one in di-epoxide and alkyl polyols.Its content is second segment protection liquid total amount 0～5%.
Protection liquid (3) in cap rock liquid by artificial lysis hydrocarbon, condensate, one or more in nontoxic silicone oil, mineral wet goods.Its adding amount is enough to fill the whole frozen soil layer degree of depth.
In the present invention, compatibility is good between various additives and between formation fluid, and self sealss plug isolation upper liquid drops to minimum by the sealing on packer rubber tube and mechanical performance impact.Cap rock pendular ring guarantor, nontoxic.
The effect of invention
Anticorrosion, the antiscale for gas well tubing string that described composition forms and stenlizing layer; Isolation upper liquid and packing element layer.In the dark gas well of 3500m, if sleeve pipe is Φ 177.8 × 9.19mm, oil pipe is Φ 62 × 5.51mm, and individual well consumption is 59.27m
3, the total addition of various additives is 5～10%, corrosion inhibition rate > 98%, scale inhibition performance > 95%, sterilizing rate 100%, deoxygenation rate 100%.If sleeve pipe is Φ 139.7 × 7.72mm, oil pipe is Φ 62 × 5.51mm, and individual well consumption is 31.84m
3.
Accompanying drawing explanation
The natural gas well annular space protection oil annular tube structure schematic diagram of Fig. 1 band self sealss ability
In figure: 1 sleeve pipe, 2 packers, 3 oil pipes, 4 corrosion inhibiting and descaling agent layers, 5 postpone sealant layer, 6 lid liquid layers, 7 well head frozen soil layers, 8 sides are led to sliding sleeve, 9 setting ball seats.
The specific embodiment
A kind of natural gas well annular space protection tubing and casing with self sealss ability described in the utility model, it comprises: oil pipe 3, sleeve pipe 1, separator 2, setting ball seat 9, the logical sliding sleeve 8 of side, corrosion inhibiting and descaling agent layer 4, delay sealant layer 5, lid liquid layer 6;
Oil pipe is placed in cover tube hub, the annular space being formed by oil pipe and sleeve pipe is disposed with separator, delay sealant layer, corrosion inhibiting and descaling agent layer and lid liquid layer from the bottom to top, setting ball seat is positioned at oil pipe and postpones sealant layer place, the logical sliding sleeve of side is positioned at corrosion inhibiting and descaling agent layer lower end on tubing wall, between the frozen soil layer 7 and well head of lid liquid layer in aboveground portion.
Claims (1)
1. the protection of the natural gas well annular space with a self sealss ability tubing and casing, it comprises: oil pipe, sleeve pipe, separator, setting ball seat, the logical sliding sleeve of side, corrosion inhibiting and descaling agent layer, delay sealant layer, lid liquid layer; It is characterized in that:
Oil pipe is placed in cover tube hub, the annular space being formed by oil pipe and sleeve pipe is filled with separator, delay sealant layer, corrosion inhibiting and descaling agent layer and lid liquid layer from the bottom to top successively, setting ball seat is positioned at oil pipe and postpones sealant layer place, the logical sliding sleeve of side is positioned at corrosion inhibiting and descaling agent layer lower end on tubing wall, between the frozen soil layer and well head of lid liquid layer in aboveground portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320704237.9U CN203626623U (en) | 2013-11-08 | 2013-11-08 | Natural gas well annulus protection oil casing with self-sealing capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320704237.9U CN203626623U (en) | 2013-11-08 | 2013-11-08 | Natural gas well annulus protection oil casing with self-sealing capacity |
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|---|---|
| CN203626623U true CN203626623U (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320704237.9U Expired - Fee Related CN203626623U (en) | 2013-11-08 | 2013-11-08 | Natural gas well annulus protection oil casing with self-sealing capacity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104033139A (en) * | 2014-06-20 | 2014-09-10 | 中国石油化工股份有限公司 | Corrosion and leakage preventing production pipe column of CO2 oil displacement injection well |
| CN104405301A (en) * | 2014-09-23 | 2015-03-11 | 中国石油天然气股份有限公司 | Freezing and blocking-prevention production pipe column for natural gas well |
-
2013
- 2013-11-08 CN CN201320704237.9U patent/CN203626623U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104033139A (en) * | 2014-06-20 | 2014-09-10 | 中国石油化工股份有限公司 | Corrosion and leakage preventing production pipe column of CO2 oil displacement injection well |
| CN104405301A (en) * | 2014-09-23 | 2015-03-11 | 中国石油天然气股份有限公司 | Freezing and blocking-prevention production pipe column for natural gas well |
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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 |
Granted publication date: 20140604 Termination date: 20211108 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |