CN114654636A - Water-soluble self-lubricating spherical pig and preparation method thereof - Google Patents
Water-soluble self-lubricating spherical pig and preparation method thereof Download PDFInfo
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- CN114654636A CN114654636A CN202210238019.4A CN202210238019A CN114654636A CN 114654636 A CN114654636 A CN 114654636A CN 202210238019 A CN202210238019 A CN 202210238019A CN 114654636 A CN114654636 A CN 114654636A
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- Prior art keywords
- water
- spherical pig
- soluble
- self
- lubricating spherical
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
- B08B9/057—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices being entrained discrete elements, e.g. balls, grinding elements, brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/003—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor characterised by the choice of material
- B29C39/006—Monomers or prepolymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
- B08B2209/027—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces
- B08B2209/04—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces using cleaning devices introduced into and moved along the pipes
- B08B2209/053—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces using cleaning devices introduced into and moved along the pipes being moved along the pipes by a fluid, e.g. by fluid pressure or by suction
Abstract
The invention discloses a water-soluble self-lubricating spherical pig and a preparation method thereof. According to the small-diameter pipeline, a constructor can complete the operation only by operating a single pigging pump and related valves, the operation is simple and convenient, the labor intensity is greatly reduced, the preparation method of the pigging ball is simple, the operation is easy, the cost is low, the small-diameter pipeline is suitable for the pipeline environment which cannot use the mechanical pigging ball for pigging operation, the labor environment can be improved, the requirement for supporting ship and platform resources is reduced, the risk of blocking the pigging operation is reduced, good economic benefits can be obtained, and the purposes of energy conservation, emission reduction, cost reduction and efficiency improvement are achieved.
Description
Technical Field
The invention relates to the technical field of ocean engineering, in particular to a water-soluble self-lubricating spherical pig and a preparation method thereof.
Background
The deep sea oil and gas field is developed by using the underwater production system, so that an expensive offshore oil production platform can be avoided, and a large amount of construction investment is saved. And the underwater production system is less influenced by weather and has strong reliability, so the underwater production system becomes a key technology of the deepwater oil and gas field. In the process of construction, the submarine oil and gas pipeline inevitably carries sand, soil, welding slag, sewage or other impurities. The pigging of the pipeline is therefore an indispensable procedure for the pre-commissioning phase before the subsea production system is put into production.
After pipeline delivery, the submarine pipelines for conveying petroleum and natural gas are all operated continuously. Because certain impurities, condensate and hydrate may exist in the conveyed medium, precipitates are attached to the inner wall of the pipeline, and finally, the pipeline conveying efficiency is reduced, the inner wall of the pipeline is corroded, or equipment such as an instrument valve is blocked. Therefore, the pipeline cleaning operation is an important work in the process of operation and maintenance before the submarine pipeline is put into production. The pipe cleaning operation is to use compressed air or water to push a pipe cleaner to clean impurities, sand, accumulated water and floating rust in the pipeline and to check the passing performance of the pipeline. The selection of the cleaning pig is very critical, and the success or failure of the cleaning operation is directly related.
The pig is the equipment that can remove in order to clear up the residue in pipeline inside, according to the difference of structure and material, can divide into foam ball pig, integral type rubber ball pig and mechanical pig. The foam ball pipe cleaner is made of polyurethane foam as a main material, has the characteristics of high compression rate, large deformation, light weight, simplicity and convenience in use, low cost, strong passing capacity and the like, and is poor in wear resistance and capacity of removing residues on the pipe wall. The integrated rubber ball pipe cleaner is usually made of polyurethane or oil-resistant and wear-resistant chloroprene rubber, has the characteristics of small deformation, good elasticity, easiness in operation, safety in use and the like, and has better sealing capability than a mechanical pipe cleaning ball, but has poorer pipe cleaning capability than the mechanical pipe cleaner. The mechanical pipe cleaner consists of a metal main body (iron or aluminum) and an isolation sealing device for driving the balls to move in the pipeline, has strong cleaning capacity, and is also a main pipe cleaner used in the current pipeline cleaning operation. However, when the mechanical pipe cleaner is used for cleaning the pipeline, monitoring needs to be well implemented, and the problem that the mechanical pipe cleaner is blocked due to deformation of the pipeline is avoided.
Conventional pigging operations are performed on offshore platforms, using deck space to house the barrels. The spherical pig starts from the spherical pig serving barrel, goes down the sea pipe through the vertical pipe and finally receives the spherical pig at the destination; since subsea wellheads are usually located far from offshore platforms or land, there is not enough room to place the launch canister. Therefore, the conventional pipe cleaner is difficult to clean the small-caliber pipeline or the reducing pipeline on the seabed. Or even if a special spherical pig could be used for pigging, the cost of pigging would be very high.
At present, the three conventional pipeline cleaning technologies are mature, and have better economical efficiency and higher efficiency for pipelines with larger calibers. However, in the pipe cleaning operation of the conventional pipeline, the preliminary preparation work is complicated, the installation labor intensity of the temporary ball receiving and sending device is large, the operation is inconvenient, and a perfect pipe cleaning mode is lacked for a small-caliber pipeline (the pipe diameter is less than 102mm) and a reducing pipeline. The risk of ball blocking caused by mechanical pipe cleaning operation is large, and particularly for pipelines in a flexible-rigid pipe combination mode, even if special pipe cleaning operation is used, the risk of blockage of the pipe cleaning ball is still much higher than that of large-diameter pipelines.
Disclosure of Invention
The invention aims to solve the technical problem of how to provide a water-soluble self-lubricating spherical pig and a preparation method thereof, which are suitable for small-diameter pipelines, have good effect of pig cleaning and are not easy to clamp balls.
In order to solve the technical problems, the invention provides a water-soluble self-lubricating spherical pig which is prepared by uniformly mixing a water-soluble polymer, a plasticizer, a super absorbent resin and a defoaming agent and pouring and molding the mixture in a mold according to the pipe diameter.
Further, the weight percentages of the components are as follows:
(1) 1 to 20 percent of water-soluble polymer;
(2) 67% -88% of plasticizer;
(3) 1% -12% of super absorbent resin;
(4) 0.01 to 1 percent of defoaming agent.
Further, the water-soluble polymer is at least one of polyvinyl alcohol, polyvinyl acetate, cellulose and derivatives thereof.
Further, the plasticizer is one or a mixture of more of glycerol, ethylene glycol, diethanolamine and triethanolamine.
Furthermore, the super absorbent resin is one or a mixture of several of low cross-linked sodium polyacrylate, starch grafted polyacrylamide, low cross-linked carboxymethyl cellulose, carboxymethyl cellulose grafted polyacrylamide and hydroxyethyl cellulose grafted polyacrylamide.
Further, the defoaming agent is at least one of polyether modified organosilicon or polysiloxane.
A preparation method of a water-soluble self-lubricating spherical pig comprises the following steps:
(1) dissolving a water-soluble polymer, a super absorbent resin and a defoaming agent in a plasticizer at normal temperature and normal pressure, and fully stirring until the water-soluble polymer, the super absorbent resin and the defoaming agent are completely dissolved and uniformly dispersed;
(2) and (2) pouring the mixture obtained in the step (1) into a mold with the same diameter as the pipe to be cleaned, preserving heat for 5-6 hours at 130 ℃, cooling to room temperature, and taking out the spherical pig to finish the preparation of the self-lubricating spherical pig.
The invention has the technical effects that: (1) the plasticizer is used as a good solvent of the water-soluble polymer, and can fully dissolve the water-soluble polymer to form an elastomer, so that the elasticity and the sealing of the spherical pig are improved; the organic silicon defoaming agent can avoid bubbles generated in the preparation process; when carrying out the dredging pipe operation, the dredging pipe ball can continuously release the plasticizer and play the lubrication action, can effectively prevent that the dredging pipe ball from producing crooked card ball phenomenon even, takes place the volume inflation after super absorbent resin can absorb the residual moisture in the pipeline, can guarantee that the dredging pipe ball has good sealing performance all the time, ensures that the high-efficient completion of dredging pipe work.
(2) The preparation method of the spherical pig provided by the invention is simple, easy to operate and low in cost, and is suitable for pipeline environments in which mechanical spherical pigs cannot be applied to pipeline cleaning operation;
(3) for small-diameter pipelines, construction workers can finish the operation only by operating a single pipe cleaning pump and related valves, the operation is simple and convenient, and the labor intensity is greatly reduced.
(4) The method can improve the labor environment, reduce the requirements on supporting ship and platform resources, reduce the risk of blocking balls in the pigging operation, and obtain good economic benefit so as to achieve the purposes of saving energy, reducing emission, reducing cost and improving efficiency.
(5) The spherical pig provided by the invention can be dissolved in water, can be biodegraded without polluting the environment, and the decomposed substances and the discharge meet the national and local standard of standards in environmental protection without recycling treatment. .
Detailed Description
The present invention is further described with reference to specific examples to enable those skilled in the art to better understand the present invention and to practice the same, but the examples are not intended to limit the present invention.
The invention provides a water-soluble self-lubricating spherical pig and a preparation method thereof, which are implemented specifically as follows:
a water-soluble self-lubricating spherical pig is prepared from water-soluble polymer, plasticizer, high-hydroscopicity resin and defoaming agent through proportional mixing and pouring in mould.
The self-lubricating spherical pig comprises the following components in percentage by weight:
(1) 1 to 20 percent of water-soluble polymer;
(2) 67% -88% of plasticizer;
(3) 1 to 12 percent of super absorbent resin;
(4) 0.01 to 1 percent of defoaming agent.
The water-soluble polymer is at least one of polyvinyl alcohol, polyvinyl acetate, cellulose and derivatives thereof.
The plasticizer is one or more of glycerol, glycol, diethanolamine, and triethanolamine.
The super absorbent resin is one or a mixture of a plurality of low cross-linked sodium polyacrylate, starch grafted polyacrylamide, low cross-linked carboxymethyl cellulose, carboxymethyl cellulose grafted polyacrylamide and hydroxyethyl cellulose grafted polyacrylamide.
The defoaming agent is at least one of polyether modified organic silicon or polysiloxane.
The invention also discloses a preparation method of the water-soluble self-lubricating spherical pig, which comprises the following steps:
(1) dissolving a water-soluble polymer, a super absorbent resin and a defoaming agent in a plasticizer at normal temperature and normal pressure, and fully stirring until the water-soluble polymer, the super absorbent resin and the defoaming agent are completely dissolved and uniformly dispersed;
(2) and (2) pouring the mixture obtained in the step (1) into a mold with the same diameter as the pipe to be cleaned, preserving heat for 5-6 hours at 130 ℃, cooling to room temperature, and taking out the spherical pig to finish the preparation of the self-lubricating spherical pig.
Example one
A water-soluble self-lubricating spherical pig is prepared from polyvinyl alcohol (water-soluble polymer), propanetriol (plasticizer), low-cross-linked sodium polyacrylate (high-hydroscopicity resin), and organosilicon defoaming agent. The preparation method comprises the following steps:
(1) 12kg of polyvinyl alcohol 1788 and 1kg of sodium low-crosslinking polyacrylate were uniformly dispersed in 86.9kg of glycerol at normal temperature and pressure. Stirring at 1000rpm for 10min, and adding 0.1kg silicone defoaming agent dropwise to mix thoroughly.
(2) Pouring the mixture into a mould with the same diameter as the pipe to be cleaned according to the size of the pipe. The incubation was carried out at 130 ℃ for 5 hours. And taking out the spherical pig after cooling to room temperature.
Example two
A water-soluble self-lubricating spherical pig is prepared from polyvinyl alcohol, carboxymethyl cellulose (water-soluble polymer), propanetriol, triethanolamine (plasticizer), low-cross-linked sodium polyacrylate (high-hydroscopicity resin), and organosilicon defoaming agent. The preparation method comprises the following steps:
(1) at normal temperature and pressure, 2488 kg of polyvinyl alcohol, 1kg of sodium carboxymethylcellulose and 1kg of sodium low-crosslinking polyacrylate are uniformly dispersed in 88kg of glycerol and 0.9kg of triethanolamine. Stirring at 1000rpm for 10min, and adding 0.1kg silicone defoaming agent dropwise to mix thoroughly.
(2) Pouring the mixture into a mold with the same diameter as the pipe to be cleaned according to the size of the pipe. The incubation was carried out at 130 ℃ for 5 hours. And taking out the spherical pig after cooling to room temperature.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (7)
1. A water-soluble self-lubricating spherical pig which is characterized in that: the water-soluble polymer, the plasticizer, the super absorbent resin and the defoamer are compounded and mixed uniformly, and the mixture is poured and molded in a mold according to the pipe diameter.
2. The water-soluble self-lubricating spherical pig of claim 1, wherein: the weight percentages of the components are as follows:
(1) 1 to 20 percent of water-soluble polymer;
(2) 67% -88% of plasticizer;
(3) 1 to 12 percent of super absorbent resin;
(4) 0.01 to 1 percent of defoaming agent.
3. The water-soluble, self-lubricating spherical pig of claim 2, wherein: the water-soluble polymer is at least one of polyvinyl alcohol, polyvinyl acetate, cellulose and derivatives thereof.
4. The water-soluble self-lubricating spherical pig of claim 2, wherein: the plasticizer is one or more of glycerol, ethylene glycol, diethanolamine and triethanolamine.
5. The water-soluble self-lubricating spherical pig of claim 2, wherein: the super absorbent resin is one or a mixture of a plurality of low cross-linked sodium polyacrylate, starch grafted polyacrylamide, low cross-linked carboxymethyl cellulose, carboxymethyl cellulose grafted polyacrylamide and hydroxyethyl cellulose grafted polyacrylamide.
6. The water-soluble self-lubricating spherical pig of claim 2, wherein: the defoaming agent is at least one of polyether modified organic silicon or polysiloxane.
7. The preparation method of the water-soluble self-lubricating spherical pig comprises the following steps of:
(1) dissolving a water-soluble polymer, a super absorbent resin and a defoaming agent in a plasticizer at normal temperature and normal pressure, and fully stirring until the water-soluble polymer, the super absorbent resin and the defoaming agent are completely dissolved and uniformly dispersed;
(2) and (2) pouring the mixture obtained in the step (1) into a mold with the same diameter as the pipe to be cleaned, preserving heat for 5-6 hours at 130 ℃, cooling to room temperature, and taking out the spherical pig to finish the preparation of the self-lubricating spherical pig.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210238019.4A CN114654636B (en) | 2022-03-11 | 2022-03-11 | Water-soluble self-lubricating pigging and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210238019.4A CN114654636B (en) | 2022-03-11 | 2022-03-11 | Water-soluble self-lubricating pigging and preparation method thereof |
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| CN114654636A true CN114654636A (en) | 2022-06-24 |
| CN114654636B CN114654636B (en) | 2023-08-18 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048521A (en) * | 1987-06-09 | 1991-01-16 | 株式会社生物世界 | Soft-contact lens |
| US5385688A (en) * | 1993-01-08 | 1995-01-31 | American Polywater Corporation | Antifreeze gel composition for use in a cable conduit |
| CN111604333A (en) * | 2020-05-26 | 2020-09-01 | 李得恩 | Soluble layered pipeline cleaner |
-
2022
- 2022-03-11 CN CN202210238019.4A patent/CN114654636B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048521A (en) * | 1987-06-09 | 1991-01-16 | 株式会社生物世界 | Soft-contact lens |
| US5385688A (en) * | 1993-01-08 | 1995-01-31 | American Polywater Corporation | Antifreeze gel composition for use in a cable conduit |
| CN111604333A (en) * | 2020-05-26 | 2020-09-01 | 李得恩 | Soluble layered pipeline cleaner |
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| Publication number | Publication date |
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| CN114654636B (en) | 2023-08-18 |
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