CN105131925A - Packer liquid capable of reducing carbon dioxide corrosion at high temperature under high pressure and preparation method thereof - Google Patents
Packer liquid capable of reducing carbon dioxide corrosion at high temperature under high pressure and preparation method thereof Download PDFInfo
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- CN105131925A CN105131925A CN201510469636.5A CN201510469636A CN105131925A CN 105131925 A CN105131925 A CN 105131925A CN 201510469636 A CN201510469636 A CN 201510469636A CN 105131925 A CN105131925 A CN 105131925A
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- packer fluids
- weighting agent
- packer
- composite salt
- carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/54—Compositions for in situ inhibition of corrosion in boreholes or wells
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/32—Anticorrosion additives
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- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
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Abstract
The invention discloses a packer liquid capable of reducing the carbon dioxide corrosion at a high temperature under a high pressure and a preparation method thereof. The packer liquid is composed of the following components in parts by weight: 100 parts of fresh water, 0.20 to 0.50 part of NaOH, 0.10 to 0.30 part of deoxidant, 1 to 6 parts of corrosion inhibitor, and 10 to 200 parts of composite salt weighting agent; wherein the composite salt weighting agent is prepared by compounding inorganic phosphate and organic phosphonate. The packer liquid is a non-solid phase, and the density can reach 1.60 g/cm3 or more. The packer liquid can tolerate a temperature of 150 DEG C, and is capable of reducing the corrosion of carbon dioxide on tubing in the wells at a high temperature under a high pressure. Furthermore, compatibility between the packer liquid and seawater/stratum produced water is good, and thus the packer liquid can be applied to the well-completion practice on an oil gas well with a high carbon dioxide content at a high temperature under a high pressure.
Description
Technical field
The present invention relates to a kind of working fluid in hp-ht well well-completion practice and preparation method thereof, specifically, be a kind of packer fluids and preparation method thereof reducing the corrosion of High Temperature High Pressure carbon dioxide, belong to technical field of oilfield chemistry.
Background technology
In well-completion practice process, stay the liquid in oil well oil conduit and sleeve pipe or protector string and sand string circular clearance, be called packer fluids or annular protective liquid.The main purpose of packer fluids keeps the fluid column static pressure between top layer or protector string, prevents inside and outside generation pressure difference and jeopardize sleeve pipe.The more important thing is, packer fluids need at the whole production period of oil well, protect top layer and intermediate casing inwall and sand string outer wall not to be corroded.
Usually, the packer fluids adopted are solid free brine, as NaCl, KCl, CaCl
2, CaBr
2, ZnBr
2and HCOONa and HCOOK, need according to different densities, regulate the kind of salt and the concentration of salt, realize the annular space protection under different well condition, such as, need under elevated pressure conditions to use high-density packer fluids.
For High Temperature High Pressure Oil/gas Well, if containing a large amount of CO in Sweet natural gas
2gas, then shaft bottom CO
2dividing potential drop also will inevitably be high, some well CO
2dividing potential drop is up to nearly 30MPa.Although packer fluids are present in annular space, once leap up Lou, then there is CO equally
2gas enters annular space, contacts with packer fluids, greatly will inevitably aggravate the corrodibility of packer fluids.Raw material for preparing density brine packer fluids is generally bromine salt (as CaBr
2, ZnBr
2deng) and formate, due to CaBr
2/ ZnBr
2himself there is very severe corrosive, use in hp-ht well and be restricted, and formate, as HCOOK etc., although itself corrodibility is little, HCOOK salt solution is having CO
2after gas enters, its corrodibility enlarges markedly, thus can not meet the long-term requirement for anticorrosion of packer fluids.Meanwhile, prior art also has and adopts single inorganic phosphate to prepare packer fluids as weighting agent, but its easily and the high seawater of calcium, magnesium ion content or stratum recovered water formed and precipitate.
In prior art, there are not the packer fluids for reducing the corrosion of High Temperature High Pressure carbon dioxide.
Summary of the invention
The object of the invention is for above-mentioned the deficiencies in the prior art, there is provided a kind of and be applicable to High Temperature High Pressure and the packer fluids system of the high oil gas well completion operation of carbon dioxide content, these packer fluids adopt composite salt to increase the weight of, containing organic phosphonate, the corrosion of High Temperature High Pressure carbon dioxide to downhole tubular goods can be reduced, also have simultaneously with seawater and stratum recovered water compatibleness good, the stratum recovered water high with calcium/magnesium ion content contacts and can not form precipitation, thermostability is good, temperature resistance reaches 150 DEG C, and density can reach 1.60g/cm
3above.
Another object of the present invention is the preparation method providing above-mentioned a kind of packer fluids.
For achieving the above object, the present invention takes following scheme: a kind of packer fluids reducing the corrosion of High Temperature High Pressure carbon dioxide, are made up of the component of following weight part: fresh water 100 parts, NaOH0.20-0.50 part, oxygen scavenger 0.10-0.30 part, inhibiter 1-6 part, composite salt weighting agent 10-200 part; Wherein, to be that inorganic phosphate and organic phosphonate are composite form composite salt weighting agent.
Preferably, described composite salt weighting agent is by the inorganic phosphate of 50-95wt% with the organic phosphonate of 5-50wt% is composite forms.
Preferred further, described inorganic phosphate is the one in dipotassium hydrogen phosphate, Tripotassium phosphate, potassium pyrophosphate.
Preferred further, described organic phosphonate is the one in Amino Trimethylene Phosphonic Acid five sodium, hydroxy ethylene diphosphonic acid four sodium, hexanediamine tetramethylene phosphonic acid sylvite, diethylene triamine pentamethylene phosphonic sodium.
In technical solution of the present invention, described oxygen scavenger can be S-WAT or saccharosonic acid.
In technical solution of the present invention, described inhibiter adopts imidazolidine derivatives and alkynol, preferably, can be 1-aminoethyl-1-carboxymethyl-2-17 thiazolinyl imidazolitm chloride quinoline or butynediol.
The preparation method's concrete steps of packer fluids reducing the corrosion of High Temperature High Pressure carbon dioxide of the present invention are as follows: in 100 parts of fresh water, add 0.2-0.5 part NaOH, stirs fully dissolving in 5-20 minute; Add 10-200 part composite salt weighting agent regulating density again, stir and fully dissolve for 30-60 minute; Finally add 0.10-0.30 part oxygen scavenger and 1-6 part inhibiter, stir; Quiescent settling filters and get final product.
In technical solution of the present invention, each component is as follows at the Action Specification in sealing liquid:
(1) oxygen scavenger: oxygen scavenger, for removing the dissolved oxygen in packer fluids, contributes to controlling packer fluids to the corrosion of downhole tubular goods.Oxygen scavenger of the present invention adopts S-WAT, saccharosonic acid etc.;
(2) inhibiter: inhibiter is by stoping packer fluids medium to the corrosion of tubing in metallic surface absorption film-forming, and inhibiter of the present invention adopts imidazolidine derivatives and alkynol, as 1-aminoethyl-1-carboxymethyl-2-17 thiazolinyl imidazolitm chloride quinoline, butynediol etc.;
(3) composite salt weighting agent: for hp-ht well completion, its packer fluids density used also requires high, usually adopts salt solution to increase the weight of, as formate (HCOONa, HCOOK), bromine salt (CaBr
2, ZnBr
2) etc., but at high temperature bromine salt itself just has very strong corrodibility to iron and steel; And formate is owing to having huge legendary turtle cooperation use, the FeCO of solubilized densification
3corrosion product; destroy the formation of protective membrane; pressure is divided also to have very strong corrodibility to iron and steel at high carbon dioxide; the present invention selects inorganic phosphate as weighting agent for this reason; to improve packer fluids density, inorganic phosphate mainly contains dipotassium hydrogen phosphate, Tripotassium phosphate, potassium pyrophosphate, but; adopt the packer fluids that single inorganic phosphate is prepared as weighting agent, the seawater high with calcium, magnesium ion content or stratum recovered water can form precipitation.Select organic phosphonate and inorganic phosphate to carry out composite for this reason, to suppress precipitation to be formed, available organic phosphonate mainly contains Amino Trimethylene Phosphonic Acid five sodium, hydroxy ethylene diphosphonic acid four sodium, hexanediamine tetramethylene phosphonic acid sylvite, diethylene triamine pentamethylene phosphonic sodium etc.
The present invention has following Advantageous Effects relative to prior art:
(1) packer fluids of the present invention are Solid Free, can not card pkr, are convenient to well-completion practice;
(2) packer fluids density of the present invention can reach 1.60g/cm
3above, packer fluids are increased the weight of higher than potassium formate brines;
(3) packer fluids Heat stability is good of the present invention, temperature resistance reaches 150 DEG C;
(4) packer fluids corrodibility of the present invention is little, at CO
2partial pressure value reaches 12.36MPa, temperature more than 150 DEG C, and erosion rate is less than potassium formate brines and increases the weight of packer fluids;
(5) packer fluids of the present invention adopt composite salt to increase the weight of, and containing organic phosphonate, compatibleness is good, contact can not form precipitation with calcium, stratum recovered water that magnesium ion content is high.
Embodiment
Be described in further details the present invention below by embodiment, these embodiments are only used for the present invention is described, do not limit the scope of the invention.
Embodiment 1 prepares packer fluids of the present invention according to the following steps:
(1) composite salt weighting agent preparation: get 850g potassium pyrophosphate, 150g diethylene triamine pentamethylene phosphonic sodium, stirs mixture even, obtained composite salt weighting agent;
(2) packer fluids preparation: add 3gNaOH in 1000g fresh water, stirs and fully dissolves for 5 minutes; Add 940g composite salt weighting agent again, stir and fully dissolve for 30 minutes; Finally add 2g S-WAT oxygen scavenger and 50g1-aminoethyl-1-carboxymethyl-2-17 thiazolinyl imidazolitm chloride quinoline inhibiter, stir, quiescent settling filters, and obtaining density is 1.45g/cm
3packer fluids.
Embodiment 2 prepares packer fluids of the present invention according to the following steps:
(1) composite salt weighting agent preparation: get 800g potassium pyrophosphate, 200g hexanediamine tetramethylene phosphonic acid potassium, stirs mixture even, obtained composite salt weighting agent;
(2) packer fluids preparation: add 2gNaOH in 1000g fresh water, stirs and fully dissolves for 5 minutes; Add 760g composite salt weighting agent again, stir and fully dissolve for 30 minutes; Finally add 2g S-WAT oxygen scavenger and 30g1-aminoethyl-1-carboxymethyl-2-17 thiazolinyl imidazolitm chloride quinoline inhibiter, stir, quiescent settling filters, and obtaining density is 1.25g/cm
3packer fluids.
Embodiment 3 prepares packer fluids of the present invention according to the following steps:
(1) composite salt weighting agent preparation: get 850g potassium pyrophosphate, 150g diethylene triamine pentamethylene phosphonic sodium, stirs mixture even, obtained composite salt weighting agent;
(2) packer fluids preparation: add 5gNaOH in 1000g fresh water, stirs and fully dissolves for 5 minutes; Add 1400g composite salt weighting agent again, stir and fully dissolve for 30 minutes; Finally add 3g S-WAT oxygen scavenger and 50g1-aminoethyl-1-carboxymethyl-2-17 thiazolinyl imidazolitm chloride quinoline inhibiter, stir, quiescent settling filters, and obtaining density is 1.60g/cm
3packer fluids.
1, packer fluids are evaluated with seawater and recovered water compatibleness: the packer fluids that embodiment 1-3 is prepared respectively with seawater and simulate recovered water by volume 1:1 mix, observe precipitation production, replace composite salt weighting agent with by single tetra-sodium sylvite as weighting agent simultaneously, be respectively 1.45g/cm according to embodiment 1-3 compound method preparation density
3, 1.25g/cm
3, 1.60g/cm
3packer fluids contrast, and the results are shown in Table 1.
As can be seen from Table 1, embodiment 1-3 preparation packer fluids, adopt composite salt increase the weight of, containing organic phosphonate, with seawater and recovered water compatibleness good, do not precipitate formation; And adopt the packer fluids that single tetra-sodium sylvite is prepared as weighting agent, then have and precipitate generation in a large number, show that packer fluids and seawater and recovered water compatibleness are poor.
Table 1 packer fluids and seawater and recovered water compatibleness
Note: simulation recovered water is prepared by calcium chloride, wherein Ca
2+concentration is 1000mg/L.
2, packer fluids divide pressure to corrosion of metal evaluation at high temperature high carbon dioxide: the packer fluids of Evaluation operation example 1 and 2 preparation are respectively at CO
2extent of corrosion to material 13Cr steel disc at dividing potential drop 12.36MPa, temperature 150 DEG C, replaces composite salt weighting agent with by potassium formiate as weighting agent simultaneously, is respectively 1.45g/cm according to embodiment 1 and 2 compound method preparation density
3, 1.25g/cm
3packer fluids contrast, and the results are shown in Table 2.
As can be seen from Table 2, the packer fluids that embodiment 1 and 2 is prepared, adopt composite salt to increase the weight of, divide pressure to be starkly lower than to corrosion of metal the packer fluids prepared by potassium formiate at high temperature high carbon dioxide.
Table 2 packer fluids divide pressure to corrosion of metal at high temperature high carbon dioxide
。
Embodiment 4 prepares packer fluids of the present invention according to the following steps:
(1) composite salt weighting agent preparation: get 900g dipotassium hydrogen phosphate, 100g Amino Trimethylene Phosphonic Acid five sodium, stirs mixture even, obtained composite salt weighting agent;
(2) packer fluids preparation: add 2.5gNaOH in 1000g fresh water, stirs and fully dissolves for 10 minutes; Add 100g composite salt weighting agent again, stir and fully dissolve for 35 minutes; Finally add 2.5g saccharosonic acid and 40g butynediol inhibiter, stir, quiescent settling filters, and obtaining density is 1.60g/cm
3packer fluids.
Embodiment 5 prepares packer fluids of the present invention according to the following steps:
(1) composite salt weighting agent preparation: get 500g Tripotassium phosphate, 500g hydroxy ethylene diphosphonic acid four sodium, stirs mixture even, obtained composite salt weighting agent;
(2) packer fluids preparation: add 4gNaOH in 1000g fresh water, stirs and fully dissolves for 15 minutes; Add 2000g composite salt weighting agent again, stir and fully dissolve for 50 minutes; Finally add 1.5g saccharosonic acid oxygen scavenger and 20g1-aminoethyl-1-carboxymethyl-2-17 thiazolinyl imidazolitm chloride quinoline inhibiter, stir, quiescent settling filters, and obtaining density is 1.60g/cm
3packer fluids.
Embodiment 6 prepares packer fluids of the present invention according to the following steps:
(1) composite salt weighting agent preparation: get 600g dipotassium hydrogen phosphate, 400g Amino Trimethylene Phosphonic Acid five sodium, stirs mixture even, obtained composite salt weighting agent;
(2) packer fluids preparation: add 3.5gNaOH in 1000g fresh water, stirs and fully dissolves for 5 minutes; Add 1000g composite salt weighting agent again, stir and fully dissolve for 60 minutes; Finally add 3g S-WAT oxygen scavenger and 60g butynediol inhibiter, stir, quiescent settling filters, and obtaining density is 1.60g/cm
3packer fluids.
Embodiment 7 prepares packer fluids of the present invention according to the following steps:
(1) composite salt weighting agent preparation: get 950g Tripotassium phosphate, 50g hexanediamine tetramethylene phosphonic acid sylvite, stirs mixture even, obtained composite salt weighting agent;
(2) packer fluids preparation: add 4.5gNaOH in 1000g fresh water, stirs and fully dissolves for 20 minutes; Add 500g composite salt weighting agent again, stir and fully dissolve for 40 minutes; Finally add 2g saccharosonic acid and 10g butynediol inhibiter, stir, quiescent settling filters, and obtaining density is 1.60g/cm
3packer fluids.
Claims (8)
1. can reduce packer fluids for High Temperature High Pressure carbon dioxide corrosion, it is characterized in that: be made up of the component of following weight part: fresh water 100 parts, NaOH0.20-0.50 part, oxygen scavenger 0.10-0.30 part, inhibiter 1-6 part, composite salt weighting agent 10-200 part; Wherein, to be that inorganic phosphate and organic phosphonate are composite form composite salt weighting agent.
2. packer fluids according to claim 1, is characterized in that: described composite salt weighting agent is by the inorganic phosphate of 50-95wt% and the organic phosphonate of 5-50wt% is composite forms.
3. packer fluids according to claim 1 and 2, is characterized in that: described inorganic phosphate is the one in dipotassium hydrogen phosphate, Tripotassium phosphate, potassium pyrophosphate.
4. packer fluids according to claim 1 and 2, is characterized in that: described organic phosphonate is the one in Amino Trimethylene Phosphonic Acid five sodium, hydroxy ethylene diphosphonic acid four sodium, hexanediamine tetramethylene phosphonic acid sylvite, diethylene triamine pentamethylene phosphonic sodium.
5. packer fluids according to claim 1, is characterized in that: described oxygen scavenger is S-WAT or saccharosonic acid.
6. packer fluids according to claim 1, is characterized in that: the one in described inhibiter imidazolidine derivatives or alkynol.
7. the packer fluids according to claim 1 or 6, is characterized in that: described inhibiter is 1-aminoethyl-1-carboxymethyl-2-17 thiazolinyl imidazolitm chloride quinoline or butynediol.
8. a preparation method for packer fluids according to claim 1, is characterized in that: concrete steps are as follows: in 100 parts of fresh water, add 0.2-0.5 part NaOH, stirs and fully dissolves for 5-20 minute; Add 10-200 part composite salt weighting agent regulating density again, stir and fully dissolve for 30-60 minute; Finally add 0.10-0.30 part oxygen scavenger and 1-6 part inhibiter, stir; Quiescent settling filters and get final product.
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| CN107603578A (en) * | 2017-07-31 | 2018-01-19 | 中国海洋石油总公司 | A kind of high density low ph value completion fluid exacerbation salt and preparation method thereof |
| CN109085659A (en) * | 2018-06-29 | 2018-12-25 | 中海石油(中国)有限公司湛江分公司 | A kind of integrated heat insulation test liquid for deep water single layer marine riser |
| CN111454709A (en) * | 2019-01-21 | 2020-07-28 | 中国石油化工股份有限公司 | Seawater-based acid system |
| CN111500266A (en) * | 2019-01-30 | 2020-08-07 | 中国石油化工股份有限公司 | Completion fluid composition and application thereof |
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| CN105131925B (en) | 2017-08-29 |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: CNOOC (China) Limited Zhanjiang Branch Patentee after: China Offshore Oil Group Co., Ltd. Co-patentee after: Hubei Hanc New-Technology Co., Ltd. Address before: 100010 China oil tower, 25 Chaoyangmen North Street, Dongcheng District, Beijing Co-patentee before: CNOOC (China) Limited Zhanjiang Branch Patentee before: China National Offshore Oil Corporation Co-patentee before: Hubei Hanc New-Technology Co., Ltd. |
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