CN213039254U - Chemical agent injection system of deepwater underwater wellhead - Google Patents
Chemical agent injection system of deepwater underwater wellhead Download PDFInfo
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- CN213039254U CN213039254U CN202020483971.7U CN202020483971U CN213039254U CN 213039254 U CN213039254 U CN 213039254U CN 202020483971 U CN202020483971 U CN 202020483971U CN 213039254 U CN213039254 U CN 213039254U
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Abstract
The utility model discloses a chemical agent injection system of a deepwater underwater well mouth, which comprises an agent storage tank, a high-pressure pump set, a plurality of low-pressure pump sets and a plurality of injection pipelines for connecting oil pipes of a plurality of underwater well mouths; the high-pressure pump set and each low-pressure pump set are connected in parallel between the medicament storage tank and a corresponding injection pipeline; before chemical agents are injected, the high-pressure pump set is used for displacing the gas column in the injection pipeline; and after the gas column is displaced, injecting the chemical medicament in the medicament storage tank into the oil pipe through the injection pipeline through the low-pressure pump set. The utility model discloses a chemical agent injection system of well head under deep water, through a high-pressure pump package and the cooperation of a plurality of low pressure pump package, high-pressure pump package can regard as high pressure displacement pump, can accomplish the gas column displacement and the medicament injection of a plurality of underwater well heads in the gas field, has also reduced the operation degree of difficulty on the spot when reducing the cost input.
Description
Technical Field
The utility model relates to an oil gas exploitation engineering technical field especially relates to a chemical agent injection system of deep water underwater well head.
Background
In the process of exploiting deep water oil and gas fields, an underwater production system is generally adopted for exploitation, and because formation water contains higher-concentration scale forming ions such as calcium ions, magnesium ions, carbonate radicals, sulfate radicals and the like, and the deep water oil and gas fields generally belong to high-temperature and ultrahigh-temperature wells, original chemical balance is damaged due to changes of pressure, temperature or water components to generate scale, so that oil pipes are blocked, and the yield of the oil and gas fields is influenced. Meanwhile, in order to ensure the fluidity safety of the whole production system, the influence factors of the sea-pipe hydrate also need to be considered. It can be seen that in order to protect equipment and pipelines, it is very necessary to inject chemicals (scale inhibitors, methanol, ethylene glycol, etc.) into the development wells of deep water gas fields.
In order to reduce the cost input as much as possible, the hydrostatic column pressure is fully utilized to reduce the operating pressure of the pump when the injection pump is configured, and particularly, the injection depth of a chemical agent injection system below a mud surface is about thousands of meters, so that the chemical agent can be injected into a shaft with dozens of megapascals only by configuring an injection pump with a few megapascals on a platform in theoretical calculation.
Since the downhole injection valve is generally installed in a complete set with the tubing, it is difficult to maintain, and for this reason, the injection valve is provided with a plurality of check valves to prevent gas channeling, increasing the life of the injection valve. However, in the actual operation process, the injection valves all have gas channeling phenomena to different degrees, so that a gas column exists in the chemical injection pipeline, and when the chemical injection system is restarted, a hydrostatic column cannot be normally established, so that the chemical cannot be injected to the bottom of the well. In order to solve the problem, there are two common methods at present, one is to lease a high-pressure injection pump before each start to displace a gas column in a pipeline, and restart a medicament injection system after a normal hydrostatic column pressure is established, and the other is to design a chemical medicament injection pump as a high-pressure injection pump directly without considering the hydrostatic column at the beginning of the design. The first approach increases the operational difficulty and risk in the field, and the second approach increases the cost by several times.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in providing a convenient operation, the chemical agent injection system of the deep water underwater well head that reduces the cost and drops into.
The utility model provides a technical scheme that its technical problem adopted is: the chemical agent injection system comprises an agent storage tank, a high-pressure pump set, a plurality of low-pressure pump sets and a plurality of injection pipelines connected with oil pipes of a plurality of underwater well heads; the high-pressure pump set and each low-pressure pump set are connected in parallel between the medicament storage tank and a corresponding injection pipeline;
before chemical agents are injected, the high-pressure pump set is used for displacing the gas column in the injection pipeline; and after the gas column is displaced, injecting the chemical medicament in the medicament storage tank into the oil pipe through the injection pipeline through the low-pressure pump set.
Preferably, the chemical agent in the agent storage tank is injected into the oil pipe through the injection line by the high pressure pump set when the low pressure pump set is out of order.
Preferably, the high pressure pump set comprises a high pressure pump, a first high pressure line connected between an inlet of the high pressure pump and a medicament reservoir, a second high pressure line connected between an outlet of the high pressure pump and an injection line, and a first isolation valve disposed on the second high pressure line.
Preferably, the second high pressure line has a plurality of branch lines, each branch line being connected in parallel with a corresponding one of the low pressure pump groups to a corresponding injection line; each branch pipeline is provided with the first isolation valve.
Preferably, the low pressure pump set comprises a low pressure pump, a first low pressure line connected between an inlet of the low pressure pump and a medicament reservoir, a second low pressure line connected between an outlet of the low pressure pump and an infusion line, a second isolation valve provided on the second low pressure line.
Preferably, the chemical agent injection system further includes a pressure monitor and a flow rate detector provided on the injection line.
Preferably, the chemical injection system further comprises a check valve and a chemical injection valve provided on the injection line; the check valve is positioned at one end of the medicament injection valve away from the oil pipe.
Preferably, the pressure monitors comprise a first pressure monitor and a second pressure monitor; the first pressure monitor and the flow detector are sequentially positioned between the check valve and the medicament injection valve; the second pressure monitor is positioned at one end of the medicament injection valve close to the oil pipe.
The utility model has the advantages that: through a high-pressure pump group and a plurality of low pressure pump group cooperation, the high-pressure pump group can regard as high pressure displacement pump, can accomplish the gas column displacement and the medicament injection of a plurality of underwater well heads in the gas field, has also reduced the operation degree of difficulty on-the-spot when reducing the cost input.
In addition, the high-pressure pump set can be used for breaking the injection valve rupture disc at the beginning of use, can be used for gas column displacement in daily operation, and simultaneously the designed injection flow of the high-pressure pump can meet the requirement of simultaneously injecting all wells, so that the high-pressure pump can be used as a standby pump of other low-pressure pumps.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic view of a connection structure of a chemical injection system of a deepwater underwater wellhead according to an embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the chemical injection system of a deepwater subsea well according to an embodiment of the present invention includes a chemical storage tank 10, a high pressure pump set 20, a plurality of low pressure pump sets 30, and a plurality of injection lines 40 connecting oil pipes 1 of a plurality of subsea wells.
Wherein each low pressure pump unit 30 is connected to the tubing 1 of the underwater wellhead via an injection line 40, and the high pressure pump unit 20 and each low pressure pump unit 30 are connected in parallel between the chemical tank 10 and a corresponding injection line 40. The high pressure pump set 20 and the plurality of low pressure pump sets 30 can form a plurality of parallel connection relations, each parallel connection relation corresponds to one injection pipeline 40 and one underwater wellhead, and therefore the high pressure pump set 20 can be used as a common high pressure pump pipeline for injecting medicaments into the plurality of underwater wellheads, and investment of equipment and cost is reduced.
With this chemical injection system, the gas column in the corresponding injection line 40 is displaced by the high-pressure pump unit 20 before the injection of the chemical is performed. After the gas column is displaced, the chemical agent in the agent tank 10 is injected into the oil pipe 1 through the injection line 40 by the low pressure pump set 30. Wherein, when the low pressure pump unit 30 is repaired, the chemical agent in the agent tank 10 is injected into the oil pipe 1 through the injection line 40 by the high pressure pump unit 20. It can be seen that the high-pressure pump unit 20 is not only used for gas-column displacement before medicament injection, but also can be used as a backup pump of the low-pressure pump unit 30, so that the number of the low-pressure pumps is greatly reduced, and the cost investment is further reduced.
Specifically, in the chemical agent injection system of the present invention, the high pressure pump unit 20 includes a high pressure pump 21, a first high pressure line 22 connected between an inlet of the high pressure pump 21 and the chemical agent tank 10, a second high pressure line 23 connected between an outlet of the high pressure pump 21 and the injection line 40, and a first isolation valve 24 disposed on the second high pressure line 23. The first isolation valve 24 is used to control the on-off between the high-pressure pump 21 and the injection line 40.
The second high pressure line 23 may have a plurality of branch lines 231 corresponding to the plurality of low pressure pump groups 30, and each branch line 231 is connected to a corresponding injection line 40 in parallel with a corresponding one of the low pressure pump groups 30. Further, a first isolation valve 24 is provided on each branch line 231 to control the connection/disconnection between the high-pressure pump 21 and the corresponding injection line 40.
Each low pressure pump group 30 may include a low pressure pump 31, a first low pressure line 32 connected between an inlet of the low pressure pump 31 and the medicament reservoir 10, a second low pressure line 33 connected between an outlet of the low pressure pump 31 and the injection line 40, and a second isolation valve 34 provided on the second low pressure line 33. The second low pressure lines 33 of the plurality of low pressure pump stacks 30 are connected in parallel with a branch line 231 of the high pressure pump stack 20 to an injection line 40, and each injection line 40 is connected to a tubing 1 of a subsea wellhead.
The pressure design for the high pressure pump stack 20 and the low pressure pump stack 30 is specified below:
the design pressure of the high-pressure pump 21 is (injection point pressure + line pressure drop) × design error coefficient;
the design pressure of the low-pressure pump 31 is (injection point pressure-hydrostatic column pressure + line pressure drop) x design error factor.
In the injection point pressure, the injection point is a medicament injection point of an underwater wellhead, the injection point pressure is the pressure in a shaft at the position of the medicament injection point, and the injection point pressure can be searched according to a shaft pressure profile of the underwater wellhead into which the medicament is required to be injected. The line pressure drop is the pressure drop of the injection line 40. The hydrostatic column pressure is obtained by calculation according to the density of the chemical agent and the injection depth thereof. Designing an error coefficient to reduce the difference between theory and practice, wherein a calculated value obtained before multiplying the coefficient is pure theory, and multiplying the error coefficient to reduce the error between the theory and practice so as to reduce the error between the design and practice; in the utility model, the design error coefficient can be 1.1-1.5. In addition, according to the conditions of the respective underwater wellheads, the design pressure of the high-pressure pump 21 and the design pressure of the low-pressure pump 31 may be respectively added with a margin of 50bar based on the above calculated values to eliminate errors and the like.
Further, the chemical injection system of the present invention further includes a pressure monitor, a flow detector 43, a check valve 44, and a chemical injection valve 45 provided on the injection line 40. The check valve 44 is located on the end of the medicament injection valve 45 remote from the tubing 1.
The pressure monitor is used for monitoring real-time pressure; the flow rate detector 43 is used to monitor the injected flow rate; check valve 44 is used to prevent bottom hole pressure blow-back; the chemical injection valve 45 serves as a chemical isolation valve and controls the opening and closing of the injection line 40.
In this embodiment, the pressure monitor includes a first pressure monitor 41 and a second pressure monitor 42. The first pressure monitor 41 and the flow rate detector 43 are sequentially located between the check valve 44 and the chemical injection valve 45; a second pressure monitor 42 is located on the end of the drug injection valve 45 near the tubing 1.
The chemical injection system of the present invention further comprises a bottom injection valve 50, and the injection pipeline 40 is connected to the oil pipe 1 through the bottom injection valve 50.
Referring to fig. 1, in the chemical injection of the deepwater underwater wellhead using the chemical injection system, the chemical injection method may include the following steps:
s1, isolating the low pressure pump set 30 from the injection line 40, displacing the gas column in the injection line 40 by the high pressure pump set 20.
The high pressure pump set 20 and the corresponding low pressure pump set 30 are selected according to the underwater wellhead into which the chemical agent is to be injected. The second isolation valve 34 on the low pressure pump set 30 is closed, disconnecting the low pressure pump set 30 from the fill line 40. The first isolation valve 24 on the high pressure pump set 20 is opened to communicate the medicament reservoir 10, the high pressure pump 21 and the infusion line 40. The high-pressure pump 21 is activated and the high-pressure pump 21 displaces the gas column in the injection line 40 at its design pressure.
S2, isolating the high pressure pump set 20 and the injection line 40, injecting the chemical agent in the agent storage tank 10 into the oil pipe 1 through the injection line 40 by the low pressure pump set 30, thereby injecting the chemical agent into the underwater wellhead.
After the gas column displacement is completed in the above step S1, the first isolation valve 24 on the high-pressure pump group 20 is closed, and the communication of the high-pressure pump 21 with the injection line 40 is disconnected. The low pressure pump 31 of the low pressure pump group 30 is activated to inject the chemical agent in the agent tank 10 into the oil pipe 1 through the injection line 40 at its designed pressure.
When the low pressure pump stack 30 is taken out of service, the failed low pressure pump stack 30 is isolated from the injection line 40, communicating the high pressure pump stack 20 with the injection line 40. The high pressure pump set 20 is started, and the chemical agent in the agent storage tank 10 is injected into the oil pipe 1 through the injection pipeline 40 by the high pressure pump set 20, so that the chemical agent injection is ensured to be normally carried out.
In addition, when the chemical injection system of the present invention is initially applied, the high-pressure pump 21 is first used to puncture the rupture disk on the chemical injection valve 45 and then normal chemical injection operation is performed without the need of an external pump for rupture. The low pressure pump stack 30 and the injection line 40 are isolated when a rupture disc breakdown occurs.
When the downhole chemical agent is restarted after stopping injecting, if gas flees into the injection pipeline 40, the low-pressure pump 31 cannot inject normally, and at this time, the high-pressure pump set 20 and the injection pipeline 40 can be led to open: the first isolation valve 24 is opened and the second isolation valve 34 is closed, starting the high pressure pump 21. Stopping the high pressure pump 21 after the flow detector 43 has stable flow, observing the pressure of the first pressure monitor 41 and the second pressure monitor 42, and conducting the low pressure pump set 30 and the injection pipeline 40 when the pressure drops to the operating pressure of the low pressure pump 31 and is leveled: second isolation valve 34 is opened, first isolation valve 24 is closed, and low pressure pump 31 is activated to inject chemical downhole, while high pressure pump 21 is used as a displacement gas column.
The utility model discloses in, because high-pressure pump package 20 can form a plurality of parallelly connected relations with a plurality of low-pressure pump packages 30 among the chemical agent injection system, consequently in same gas field, it is parallelly connected with a plurality of low-pressure pump packages 30 in proper order through high-pressure pump package 20, can carry out gas displacement, operations such as medicament injection to a plurality of underwater well mouths in proper order, can also carry out rupture disk breakdown operation to a plurality of underwater well mouths in proper order through high-pressure pump package 20, very big reduction the configuration of low-pressure pump quantity, the input of cost has been reduced.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (7)
1. A chemical agent injection system of a deepwater underwater wellhead is characterized by comprising an agent storage tank, a high-pressure pump set, a plurality of low-pressure pump sets and a plurality of injection pipelines connected with oil pipes of a plurality of underwater wellheads; the high pressure pump set and each of the low pressure pump sets are connected in parallel between the medicament reservoir and a corresponding one of the infusion lines.
2. A chemical agent injection system according to claim 1, wherein the high pressure pump group comprises a high pressure pump, a first high pressure line connected between an inlet of the high pressure pump and a chemical agent reservoir, a second high pressure line connected between an outlet of the high pressure pump and an injection line, a first isolation valve provided on the second high pressure line.
3. A chemical agent injection system according to claim 2, wherein said second high-pressure line has a plurality of branch lines, each of said branch lines being connected in parallel with a corresponding one of said low-pressure pump sets to a corresponding one of said injection lines; each branch pipeline is provided with the first isolation valve.
4. A chemical agent injection system according to claim 1, wherein the low pressure pump group comprises a low pressure pump, a first low pressure line connected between an inlet of the low pressure pump and a chemical agent reservoir, a second low pressure line connected between an outlet of the low pressure pump and an injection line, a second isolation valve provided on the second low pressure line.
5. The chemical agent injection system according to any one of claims 1 to 4, further comprising a pressure monitor and a flow rate detector provided on the injection line.
6. The chemical injection system of claim 5, further comprising a check valve and a medicament injection valve disposed on the injection line; the check valve is positioned at one end of the medicament injection valve away from the oil pipe.
7. The chemical agent injection system of claim 6, wherein the pressure monitor comprises a first pressure monitor and a second pressure monitor; the first pressure monitor and the flow detector are sequentially positioned between the check valve and the medicament injection valve; the second pressure monitor is positioned at one end of the medicament injection valve close to the oil pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020483971.7U CN213039254U (en) | 2020-04-03 | 2020-04-03 | Chemical agent injection system of deepwater underwater wellhead |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020483971.7U CN213039254U (en) | 2020-04-03 | 2020-04-03 | Chemical agent injection system of deepwater underwater wellhead |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111456684A (en) * | 2020-04-03 | 2020-07-28 | 中海石油深海开发有限公司 | Chemical agent injection system and method for deepwater underwater wellhead |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111456684A (en) * | 2020-04-03 | 2020-07-28 | 中海石油深海开发有限公司 | Chemical agent injection system and method for deepwater underwater wellhead |
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