CN112280550B - Self-foaming pipe cleaning drainage ball for gathering pipeline and preparation method thereof - Google Patents
Self-foaming pipe cleaning drainage ball for gathering pipeline and preparation method thereof Download PDFInfo
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- CN112280550B CN112280550B CN202011320149.XA CN202011320149A CN112280550B CN 112280550 B CN112280550 B CN 112280550B CN 202011320149 A CN202011320149 A CN 202011320149A CN 112280550 B CN112280550 B CN 112280550B
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/92—Compositions for stimulating production by acting on the underground formation characterised by their form or by the form of their components, e.g. encapsulated material
Abstract
The invention provides a self-foaming clear pipe drain ball for a gathering and transportation pipeline, wherein the interior of the self-foaming clear pipe drain ball is a mixture of a surfactant and an auxiliary agent, and a time-delay coating is arranged on the surface of the self-foaming clear pipe drain ball. The self-foaming clear pipe drainage ball for the gathering and conveying pipeline can effectively clean the retained water in the gathering and conveying pipeline, so as to reduce the entering pressure, reduce the times of emptying for draining liquid and increase the production of natural gas. Compared with the traditional plastic pigging ball, the pigging ball is dissolved in water without recovery, thereby greatly reducing accidents caused by the fact that the pigging ball is clamped in a pipeline.
Description
Technical Field
The invention belongs to the technical field of natural gas production increase, and particularly relates to the technical field of self-foaming foam drainage products for cleaning pipes in a natural gas gathering pipeline.
Background
In the middle and later stages of gas field development, formation pressure is reduced, fracturing, acidizing and other operations are carried out by side and bottom water propulsion, and no matter a hypertonic reservoir or a hypotonic reservoir is adopted, all water-producing gas wells can finally generate bottom liquid accumulation when a gas reservoir is exhausted. Various methods are adopted to eliminate the bottom hole effusion, wherein the foam drainage method is widely applied because of low cost, easy construction and no influence on the production of gas wells, so that gas-water mixtures produced by the gas wells are conveyed to a gas collecting station by adopting a dendritic pipe network for separation and purification treatment.
In order to reduce the development cost of natural gas and simplify the ground engineering facilities and management difficulty, most of domestic gas field wellhead are not provided with gas-liquid separators, but most of gas field ground gathering and transportation pipelines are buried and laid horizontally or in a small fluctuation state, gas-water mixture produced by a foam exhaust well is in the ground gathering and transportation pipeline due to the action of gravity and low disturbance, gas and water are layered, foam is broken, the action of gas and water is obviously reduced, accumulated liquid in the gathering and transportation pipeline is gradually increased, and the ground gathering and transportation difficulty of a foam drainage gas production well is greatly increased; especially in winter, as the liquid content in the gathering and transportation pipeline is more, the pipeline is easy to be frozen and blocked, and the normal production of natural gas is seriously affected; in addition, solid phase impurities in the natural gas gathering and transportation pipeline can influence the normal transportation of the natural gas.
In order to solve the above problems, in the prior art, a spherical pig is adopted, for example, a long-distance gas pipeline machinery spherical pig of cn20192068573. X, and there are many places where cleaning and draining of pipelines are tried by using spherical pig made of corrosion-resistant neoprene, however, the spherical pig is easy to be blocked to cause accidents, and the throwing and recycling are troublesome. In order to solve the problem of blocking of the spherical pig, the patent CN201110046730.1 discloses a repeated foaming device for a collecting and conveying pipeline of a foam drainage gas production well, and provides a device for re-foaming accumulated liquid in the collecting and conveying pipeline so as to smoothly convey the accumulated liquid in the pipeline to a gas collecting station for separation treatment. However, the foaming agent is used in the device, the foaming agent has the problem that floating is difficult to control in the adding and using processes, and a large amount of active agent in the upper laminated liquid is rapidly discharged when the active agent does not fully play a role, so that the liquid filling mode has the characteristics of short acting time and low efficiency, and the maximization of resource utilization cannot be realized.
Conventional foam-bar products also include solid foam-bar bars and foam-volleyball. When the foam discharging rod is applied to a conveying pipeline with a complex structure, particularly in a high-inclination and small-angle turning pipeline, the condition that the long-strip-shaped foam discharging rod is blocked halfway can occur, the long-strip-shaped foam discharging rod cannot enter a liquid accumulation section, the foam discharging effect is affected, the foam discharging ball is rapidly dissolved, and the foaming time is difficult to control.
Disclosure of Invention
Based on the technical problem that the prior art lacks of products for foam drainage of a gathering pipeline, which causes difficult water drainage of the gathering pipeline, the invention provides a self-foaming pipe cleaning drainage ball for the pipeline and a preparation method thereof, and based on the particularity of the gathering pipeline, products different from the pipeline foam drainage ball are developed so as to adapt to the condition that most of gathering and conveying pipelines on the ground of a gas field are laid in a buried mode and are in a horizontal or small fluctuation state, and the invention can effectively clean the retained water in the gathering pipeline so as to reduce the pressure of entering a station.
The invention provides a self-foaming pipe cleaning drainage ball for a gathering and transporting pipeline, wherein the inside of the self-foaming pipe cleaning drainage ball is a mixture of a surfactant and an auxiliary agent, and a time delay coating is arranged on the surface of the self-foaming pipe cleaning drainage ball.
Further, the surfactant and adjuvant mixture of the present invention contains a foaming agent, a foam stabilizer, a self-foaming active, a breaking agent and a lubricating release agent.
In the invention, the self-foaming type pipe cleaning drainage ball comprises 15-25 parts of foaming agent, 5-15 parts of foam stabilizer, 60-80 parts of self-foaming active substance, 3-6 parts of cracking agent and 4-6 parts of lubricating release agent according to parts by weight.
Further, the foaming agent is a 1:1 mixture of a nonionic surfactant and an anionic surfactant, the foam stabilizer is a nonionic surfactant, the self-foaming active substance is a 3:2 mixture of solid acid and sodium bicarbonate, the cracking agent is sodium chloride, the lubricating release agent is sodium benzoate, and the delay coating is polyethylene glycol.
Preferably, the nonionic surfactant is fatty alcohol polyoxyethylene ether and derivative salt substances thereof, the anionic surfactant is sodium dodecyl sulfonate, the foam stabilizer is dodecyl glucoside, the solid acid of the self-foaming active substance is one or a mixture of several organic acids, and the thickness of the time-lapse coating is 0.5-1.5mm.
Further preferably, the nonionic surfactant of the present invention is fatty alcohol polyoxyethylene ether sulfate.
The invention also provides a method for preparing the self-foaming clear pipe drainage ball for the gathering and transportation pipeline, which comprises the following steps:
(1) And (3) preparation of a main agent: after fully mixing the foaming agent and the foam stabilizer, adding the self-foaming active mixture, the cracking agent and the lubricating release agent, fully drying and uniformly mixing.
(2) Preparing a foam volleyball: putting the main agent prepared in the step (1) into a spherical extrusion die, starting pressurizing, discharging the pressure in the die when the oil pressure reaches 8-12 Mpa, taking out the foam volleyball, melting polyethylene glycol at high temperature, spraying the polyethylene glycol on the surface of the foam volleyball, and cooling to room temperature to obtain the self-foaming clear pipe drain ball.
Further, the main agent is prepared by fully mixing 15% of foaming agent raw materials with 10% of foam stabilizer, adding 67% of self-foaming active mixture, 3% of cracking agent and 5% of lubricating release agent, fully drying and uniformly mixing.
Further, the foam volleyball is prepared by placing a main agent weighing a certain weight into a spherical extrusion die, starting pressurization, discharging the pressure in the die when the oil pressure reaches 10Mpa, taking out the foam volleyball, melting polyethylene glycol at a high temperature of 100 ℃, spraying the polyethylene glycol on the surface of the foam volleyball, and cooling to room temperature to obtain the self-foaming clear pipe drain volleyball.
By implementing the technical scheme of the invention, the following beneficial effects can be achieved:
(1) The self-foaming clear pipe drainage ball for the gathering and conveying pipeline provided by the invention can automatically react in the produced water with the mineralization degree of 15 ten thousand and the condensate oil content of 10%, and the water is converted into foam and is discharged along with the airflow, so that the effect of removing the retained water in the pipeline is achieved.
(2) The self-foaming clear pipe drainage ball for the gathering and conveying pipeline can effectively clean the retained water in the gathering and conveying pipeline, so as to reduce the entering pressure, reduce the times of emptying for draining liquid and increase the production of natural gas. Compared with the traditional plastic pigging ball, the pigging ball is dissolved in water without recovery, thereby greatly reducing accidents caused by the fact that the pigging ball is clamped in a pipeline.
Drawings
FIG. 1 is a graph showing the reaction time of the coating thickness versus the bulb.
Figure 2 shows a product diagram of the invention.
FIG. 3 shows a diagram of the measuring cylinder of the invention measuring the foam height.
Detailed Description
The present invention will be described with reference to the embodiments shown in fig. 1 to 3, but the present invention is not limited to the following embodiments.
The materials used in the embodiment of the invention are as follows: fatty alcohol polyoxyethylene ether, sodium dodecyl sulfonate, dodecyl glucoside, tartaric acid, oxalic acid, citric acid, maleic acid, sodium bicarbonate, sodium chloride, potassium chloride, sodium benzoate and polyethylene glycol can be purchased through public channels, and equipment and instruments adopted in the process are all common equipment in the field.
All materials, reagents and equipment selected for use in the present invention are well known in the art, but are not limiting of the practice of the invention, and other reagents and equipment known in the art may be suitable for use in the practice of the following embodiments of the invention.
The following examples further illustrate the invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, procedures, or conditions of the present invention without departing from the spirit and nature of the invention are intended to be within the scope of the present invention.
Embodiment one: preparation method of self-foaming clear pipe drainage ball for gathering and transporting pipeline
The invention provides a method for preparing a self-foaming clear pipe drainage ball for a gathering and transportation pipeline, which comprises the following steps:
(1) And (3) preparation of a main agent: after fully mixing the foaming agent and the foam stabilizer, adding the self-foaming active mixture, the cracking agent and the lubricating release agent, fully drying and uniformly mixing.
(2) Preparing a foam volleyball: putting the main agent prepared in the step (1) into a spherical extrusion die, starting pressurizing, discharging the pressure in the die when the oil pressure reaches 8-12 Mpa, taking out the foam volleyball, melting polyethylene glycol at high temperature, spraying the polyethylene glycol on the surface of the foam volleyball, and cooling to room temperature to obtain the self-foaming clear pipe drain ball.
In the experiment, the invention also adopts the steps of discharging the pressure in the mould when the oil pressure reaches 10Mpa, taking out the foam volleyball, melting polyethylene glycol at a high temperature of 100 ℃, spraying the polyethylene glycol on the surface of the foam volleyball, and cooling to room temperature.
Embodiment two: self-foaming pipe cleaning drainage ball for gathering pipeline
The self-foaming type pipe cleaning drainage ball for the gathering and conveying pipeline is characterized in that the inside of the self-foaming type pipe cleaning drainage ball is a mixture of a surfactant and an auxiliary agent, and a time delay coating is arranged on the surface of the self-foaming type pipe cleaning drainage ball.
The mixture of the surfactant and the auxiliary agent in the self-foaming type pipe cleaning drainage ball comprises a foaming agent, a foam stabilizer, a self-foaming active substance, a cracking agent and a lubricating release agent, and the delay coating adopts polyethylene glycol.
The best formulation of this example is: the foaming agent adopts a mixture of nonionic surfactant and anionic surfactant in a ratio of 1:1, the foam stabilizer adopts nonionic surfactant, the self-foaming active substance adopts a 3:2 mixture of solid acid and sodium bicarbonate, the cracking agent adopts sodium chloride, the lubricating release agent adopts sodium benzoate, and the delay coating adopts polyethylene glycol.
The formulation used for the specific experiments is shown in table 1 below:
table 1: formula of self-foaming pipe cleaning drainage ball for gathering pipeline
The foaming agent of the invention mainly acts to reduce the surface tension of water, so that the accumulated liquid in the pipeline can be foamed.
The conventional foaming agent, namely conventional betaine, is adopted in the invention, but experiments show that although the foaming amount of the betaine is slightly larger than that of fatty alcohol polyoxyethylene ether (AEO), the half life is shorter (the half life of the betaine foam in site water is 5-8min, and the half life of the AEO is 8-12min, but the foam stability is insufficient), and the requirement that the pipeline is finally carried out along with long-distance transportation of air flow after the pipeline effusion is changed into foam cannot be met. The sodium dodecyl sulfonate has the advantages of maximum foaming capacity in clear water, good foaming performance and highest foam height which is about 1.5 times that of betaine and AEO, but has very high defoaming rate in field water containing condensate oil, but has the defects of incapability of being used singly, and the sodium dodecyl sulfonate has a half life of 2-3min after being compounded with other foaming agents. Through multiple experiments, the foaming requirement and the half-life requirement can be met when the fatty alcohol-polyoxyethylene ether and the sodium dodecyl sulfonate are compounded, especially when the fatty alcohol-polyoxyethylene ether and the sodium dodecyl sulfonate 1:1, the effect is best when the foaming agent is compounded, and after the foaming agent is added into the foam stabilizer, the half life period of the foaming agent in oil-containing field water can reach more than one hour.
The foam stabilizer and the foaming agent are compatible to improve the performance, and have the capability of enhancing the foam stability, the permeability, the cleaning performance and the hard water resistance.
The self-foaming active material mainly has the function of enabling the cleaning pellets to quickly generate chemical reaction after encountering effusion, generating a large amount of carbon dioxide gas and converting the effusion in the pipe into foam.
The rupture agent mainly aims at accelerating dissolution of the foam volleyball at the effusion.
The lubricating release agent is mainly used for reducing friction force between the foam volleyball and the die, so that the product is easy to release and the molding difficulty is reduced.
The time-delay coating mainly has the effects of increasing the structural strength of the pigging ball, increasing the moving distance of the pigging ball in the pipeline, preventing premature reaction before the pigging ball reaches the accumulated liquid, increasing or reducing the polyethylene glycol spraying thickness according to the length of the field pipeline, and enabling the thickness of the time-delay coating to be 0.5-1.5mm.
Embodiment III: self-foaming pipe cleaning drainage ball performance experiment for gathering pipeline
1. Foam quality experiment
The test shows that the foaming component in the foam volleyball with the same quality and the foam stick powder of commercial products are stirred in an on-site water sample by a GJ-2000 high-speed stirrer (2 g,9000 revolutions, 1 min), and the data are shown in Table 2.
TABLE 2 foaming comparison experiment
| Foam-bar product | Height of foaming | Half-life of foam |
| Petrochemical group | 400ml | 11min 20s |
| Sichuan ban Teng | 380ml | 10min 50s |
| Chengdu Ji | 380ml | 13min 10s |
| Spherical pig foaming agent | 360ml | More than 100min |
According to experimental results, compared with a plurality of commercial foam products, the composite surfactant in the foam ball can generate dense foam in an on-site pipeline water sample, has long half-life period, and is suitable for long-distance movement of liquid carrying in a pipeline.
2. Time delay coating experiment
The product is coated with a soluble time-delay coating, the coating increases the structural strength of the product, can prevent the water vapor in the pipeline from prematurely reacting with the internal structure, and can control the reaction time of the foam volleyball by controlling the thickness of the coating, wherein the thickness of the coating and the reaction time of the foam volleyball are shown in the figure 1 of the specification.
In the experiment, the vertical free falling fragmentation height of polyethylene glycol which is not sprayed is less than 25cm, the strength is increased along with the spraying thickness, the spraying thickness is 1cm, and the vertical fragmentation height can be increased to 40cm.
3. On-site pipeline pitching experiment
The ball is thrown into a gathering pipeline through remote automatic ball throwing equipment on site, and 1 ball is thrown every two hours. According to the feedback result of the field experiment of the two gas production plants in the Changqing, the pressure of the natural gas entering the station is firstly increased briefly and then gradually decreased within one week of continuous ball throwing, so that the movement of the effusion in the pipeline along with the throwing of the pigging is illustrated, and the effusion is finally taken out of the pipeline.
4. The product performance test of the invention adopts the balance, the caliper, the stopwatch, the measuring cylinder and other test instruments to comprehensively detect the product performance, and the test structure is shown in the following figure 3.
TABLE 3 parameters of the products of the invention
| Quality of | 75g |
| Diameter of | 48mm |
| Time required for complete dissolution of the interior | 25min |
| Minimum liquid carrying amount | 200ml |
| Foam height (measuring cylinder) | 12 times of initial liquid level |
The present invention may be better implemented as described above, and the above examples are merely illustrative of preferred embodiments of the present invention and not intended to limit the scope of the present invention, and various changes and modifications made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the present invention without departing from the spirit of the design of the present invention.
Claims (6)
1. The self-foaming type clear pipe drainage ball for the gathering and delivery pipeline is characterized in that the inside of the self-foaming type clear pipe drainage ball is a mixture of a surfactant and an auxiliary agent, and a time delay coating is arranged on the surface of the self-foaming type clear pipe drainage ball; the mixture of the surfactant and the auxiliary agent in the self-foaming type pipe cleaning drainage ball comprises the following substances in parts by mass: 15-25 parts of foaming agent, 5-15 parts of foam stabilizer, 60-80 parts of self-foaming active substance, 3-6 parts of cracking agent and 4-6 parts of lubricating release agent;
the foaming agent is a mixture of fatty alcohol polyoxyethylene ether or a derivative thereof and sodium dodecyl sulfonate in a mass ratio of 1:1, the foam stabilizer is dodecyl glucoside, the self-foaming active substance is a mixture of solid acid and sodium bicarbonate in a mass ratio of 3:2, the cracking agent is sodium chloride, the lubricating release agent is sodium benzoate, and the delay coating is polyethylene glycol.
2. Self-foaming clear pipe drain ball for gathering lines as claimed in claim 1, characterized in that the solid acid of the self-foaming active is one or a mixture of several organic acids, the thickness of the time-lapse coating is 0.5-1.5mm.
3. The self-foaming clear pipe drain ball for a gathering line as recited in claim 1, wherein the derivative of the fatty alcohol-polyoxyethylene ether is a sulfate type substance of the fatty alcohol-polyoxyethylene ether.
4. A method of preparing a self-foaming clear pipe drain ball for a gathering line as defined in any one of claims 1 to 3, comprising the steps of:
(1) And (3) preparation of a main agent: fully mixing a foaming agent and a foam stabilizer, adding a self-foaming active mixture, a cracking agent and a lubricating release agent, fully drying and uniformly mixing;
(2) Preparing a foam volleyball: putting the main agent prepared in the step (1) into a spherical extrusion die, starting pressurizing, discharging the pressure in the die when the oil pressure reaches 8-12 Mpa, taking out the foam volleyball, melting polyethylene glycol at high temperature, spraying the polyethylene glycol on the surface of the foam volleyball, and cooling to room temperature to obtain the self-foaming clear pipe drain ball.
5. The method for preparing a self-foaming clear pipe drain ball for a gathering and transporting pipeline according to claim 4, wherein the preparation of the self-foaming clear pipe drain ball is characterized in that a certain weight of main agent is weighed into a spherical extrusion die, pressurization is started, when the oil pressure reaches 10Mpa, the pressure in the die is removed, the foam drain ball is taken out, polyethylene glycol is melted at a high temperature of 100 ℃ and then sprayed on the surface of the foam drain ball, and the foam drain ball is cooled to room temperature, so that the self-foaming clear pipe drain ball is obtained.
6. Use of a self-foaming clear pipe drain ball as defined in claims 1-3 in a gathering line drain pig operation.
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| CN115651625A (en) * | 2022-10-08 | 2023-01-31 | 成都华阳兴华化工有限公司 | Film-coated solid foam scrubbing agent and preparation method thereof |
| CN116355607B (en) * | 2023-03-22 | 2024-03-19 | 陕西延长石油（集团）有限责任公司 | Delayed composite foaming agent for fracturing and preparation method and construction method thereof |
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