Reviews of submersible container designs and recommendations for use
(information for specialists when choosing equipment is advisory in nature).
Containers have a number of advantages over other types of control (use of UDR, periodic treatments, injection of liquid reagents into the annulus, etc.) with complications in wells. Currently, several types of designs of submersible well containers and their filling (reagent) from different manufacturers have appeared on the market. Let's try to figure them out.
The main criteria in choosing products are the reliability of the equipment and its compliance with the desired result for the specialist.
The main criteria in choosing products are the reliability of the equipment and its compliance with the desired result for the specialist.
Regarding the reagent itself, there are two main groups of reagents: a solid reagent based on the use of a mixture of a carrier substance with the active base of the inhibitor and a reagent that consists entirely of the active base of the inhibitor (the third option is a reagent that consists of a liquid reagent inside membranes (encapsulated reagent) , is not considered because there is insufficient data on its effectiveness).
1. A solid reagent based on the use of a mixture of a carrier substance with an active inhibitor base. In this case, it is useful for a specialist to find out the content of the carrier substance in the reagent (percentage of the content of the total weight of the reagent), since the carrier substance itself is not an inhibitor and does not combat the well problem in any way (ballast), so as not to buy supposedly a lot of reagent in large quantities. container, but in fact the working inhibitor will not be enough to achieve the result.
From the point of view of adequate operation of the reagent, it is desirable to correlate the operating parameters of the carrier substance with the parameters of the well (pipeline) where the container will be used. For example, if the carrier substance is declared to be bitumen or bottoms of amine production or something else also with a low melting point, then it is recommended to compare the temperature at the place of use of the container (reservoir temperature, possible heating from the ESP) with the melting point of the carrier substance, since the carrier substance , as a rule, should dissolve slowly, releasing the active inhibitor base, rather than quickly melting, briefly releasing the active inhibitor base, which is not useful for downhole equipment.
2. A reagent that consists entirely of the active inhibitor base. It does not have the disadvantages of the above reagents with a carrier substance and the disadvantages of liquid membrane-type reagents (encapsulated reagent).
From the point of view of adequate operation of the reagent, it is desirable to correlate the operating parameters of the carrier substance with the parameters of the well (pipeline) where the container will be used. For example, if the carrier substance is declared to be bitumen or bottoms of amine production or something else also with a low melting point, then it is recommended to compare the temperature at the place of use of the container (reservoir temperature, possible heating from the ESP) with the melting point of the carrier substance, since the carrier substance , as a rule, should dissolve slowly, releasing the active inhibitor base, rather than quickly melting, briefly releasing the active inhibitor base, which is not useful for downhole equipment.
2. A reagent that consists entirely of the active inhibitor base. It does not have the disadvantages of the above reagents with a carrier substance and the disadvantages of liquid membrane-type reagents (encapsulated reagent).
According to the design of submersible well containers:
1. When choosing between an adjustable and unregulated container, it is definitely recommended to choose an adjustable one, since the removal of the reagent from the container can be adjusted to the parameters of the well and thereby ensure the required effective dosage.
2. When choosing a disposable or reusable container, on the one hand, it is clear that the reusable one has the advantage of reusable housing, which, by the way, is also limited by the requirements for the permissible number of running operations of tubing and couplings. But on the other hand, it is necessary to analyze the following points:
2. When choosing a disposable or reusable container, on the one hand, it is clear that the reusable one has the advantage of reusable housing, which, by the way, is also limited by the requirements for the permissible number of running operations of tubing and couplings. But on the other hand, it is necessary to analyze the following points:
2.1 When assessing reliability: It must be taken into account that replaceable capsules/cartridges have been added to the tubing container body. When choosing equipment, a specialist should take into account the reliability of all elements of the container, including the capsule/cartridge. For example, some manufacturers offer replaceable capsules/cartridges made of polyethylene terephthalate with lids made of low-density polyethylene, which cannot withstand temperatures above 65 degrees Celsius during prolonged use, which must be taken into account in comparison with operating conditions. In this case, our company always strengthens or replaces vulnerable components with metal so that containers with all its elements work properly under the required well parameters.
2.2 From the point of view of achieving the desired result, the specialist must take into account that the reagent in the container cannot be replaced during the operation of the well, which means that it is necessary to place the maximum possible amount of reagent in the container, taking into account, of course, the permissible load on the pump. Here it is necessary to pay attention that one meter of a disposable container can contain several times more inhibitor than one meter of a reusable one. This is explained by the fact that the ratio (conventionally per one meter of container length) of the volume of inhibitor in a disposable container to the volume of inhibitor in a reusable container is equal to the ratio of the square of the internal diameter of a section of a disposable container to the square of the internal diameter of a replaceable capsule of a reusable container (this indisputable rule of geometry applies to containers of any manufacturer). That is, when operating or purchasing a container, you need to understand that, for example, in one meter of a disposable container made of tubing 89 with an internal diameter of a section of 76 mm, there is 2.6 times more inhibitor than in one meter of a reusable container made of tubing 89 with replaceable standard capsules made of polyethylene terephthalate with an internal capsule diameter of 47 mm (that is, 4 disposable sections will replace in this case more than 10 reusable sections).
2.2 From the point of view of achieving the desired result, the specialist must take into account that the reagent in the container cannot be replaced during the operation of the well, which means that it is necessary to place the maximum possible amount of reagent in the container, taking into account, of course, the permissible load on the pump. Here it is necessary to pay attention that one meter of a disposable container can contain several times more inhibitor than one meter of a reusable one. This is explained by the fact that the ratio (conventionally per one meter of container length) of the volume of inhibitor in a disposable container to the volume of inhibitor in a reusable container is equal to the ratio of the square of the internal diameter of a section of a disposable container to the square of the internal diameter of a replaceable capsule of a reusable container (this indisputable rule of geometry applies to containers of any manufacturer). That is, when operating or purchasing a container, you need to understand that, for example, in one meter of a disposable container made of tubing 89 with an internal diameter of a section of 76 mm, there is 2.6 times more inhibitor than in one meter of a reusable container made of tubing 89 with replaceable standard capsules made of polyethylene terephthalate with an internal capsule diameter of 47 mm (that is, 4 disposable sections will replace in this case more than 10 reusable sections).
As for determining the length of the container (the specialist’s choice of the number of sections) to solve a certain problem in the well, you should adhere to the following recommendations, but do not forget the load limit at the suspension point:
1. To bring a well into production mode after repairs, drilling, hydraulic fracturing, where short-term operation of a container with a reagent against scale deposits is required, a container, preferably adjustable, with a reagent that consists entirely of the active inhibitor base, of the following length is sufficient:
When using a container with a solid reagent based on the use of a mixture of a carrier substance with an active inhibitor base, it is necessary to determine in advance the suitability of the carrier substance for the operating temperature conditions, and take into account the volume of useful inhibitor in the reagent (divide the footage of the disposable container by the proportion of the content of the useful inhibitor base in reagent).
2. For the minimum required container operation, it is advisable to use an adjustable reagent container that consists entirely of the active inhibitor base, the following length:
When using a container with a solid reagent based on the use of a mixture of a carrier substance with an active inhibitor base, it is necessary to determine in advance the suitability of the carrier substance for the operating temperature conditions, and take into account the volume of useful inhibitor in the reagent (divide the footage of the disposable container by the proportion of the content of the useful inhibitor base in reagent).
3. For stable and efficient operation of the container, it is necessary to use an adjustable container with a reagent that consists entirely of the active inhibitor base, the following length:
It is questionable to recommend the use of: 20.8 - 26 meters of a reusable container of 89 tubing or a container with a solid reagent based on the use of a mixture of a carrier substance with an active inhibitor base.
4. To operate the container at: high flow rates, very intense problems or for a long period of time, you need to use an adjustable reagent container that consists entirely of the active inhibitor base of the following length:
- 2 - 4 meters of disposable container from 89 tubing
- 3 - 6 meters of disposable container from 73 tubing
- 5.2 – 10.4 meters of reusable container made of 89 tubing.
When using a container with a solid reagent based on the use of a mixture of a carrier substance with an active inhibitor base, it is necessary to determine in advance the suitability of the carrier substance for the operating temperature conditions, and take into account the volume of useful inhibitor in the reagent (divide the footage of the disposable container by the proportion of the content of the useful inhibitor base in reagent).
2. For the minimum required container operation, it is advisable to use an adjustable reagent container that consists entirely of the active inhibitor base, the following length:
- 4 - 8 meters of disposable container from 89 tubing
- 6 - 12 meters of disposable container from 73 tubing
- 10.4 – 20.8 meters of reusable container from 89 tubing.
When using a container with a solid reagent based on the use of a mixture of a carrier substance with an active inhibitor base, it is necessary to determine in advance the suitability of the carrier substance for the operating temperature conditions, and take into account the volume of useful inhibitor in the reagent (divide the footage of the disposable container by the proportion of the content of the useful inhibitor base in reagent).
3. For stable and efficient operation of the container, it is necessary to use an adjustable container with a reagent that consists entirely of the active inhibitor base, the following length:
- 8 - 10 meters of disposable container from 89 tubing
- 12 - 15 meters of disposable container from 73 tubing
It is questionable to recommend the use of: 20.8 - 26 meters of a reusable container of 89 tubing or a container with a solid reagent based on the use of a mixture of a carrier substance with an active inhibitor base.
4. To operate the container at: high flow rates, very intense problems or for a long period of time, you need to use an adjustable reagent container that consists entirely of the active inhibitor base of the following length:
- 10 - 18 meters of disposable container from 89 tubing
- 15 - 27 meters of disposable container from 73 tubing
- use not recommended:
- 26 - 47 meters of reusable container of 89 tubing or a container with a solid reagent based on the use of a mixture of a carrier substance with an active inhibitor base.
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© L-Reagent LLC, 2001-2024
© L-Reagent LLC, 2001-2024
LLC "L-Reagent"
Russia, 614107, Perm, Uralskaya Street, 69
Russia, 614107, Perm, Uralskaya Street, 69
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