CN113153236B - Device and method for jointly replacing shaft by diesel oil and production water - Google Patents
Device and method for jointly replacing shaft by diesel oil and production water Download PDFInfo
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- CN113153236B CN113153236B CN202110493605.9A CN202110493605A CN113153236B CN 113153236 B CN113153236 B CN 113153236B CN 202110493605 A CN202110493605 A CN 202110493605A CN 113153236 B CN113153236 B CN 113153236B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0007—Equipment or details not covered by groups E21B15/00 - E21B40/00 for underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
Abstract
The invention relates to a device and a method for jointly replacing a shaft by diesel oil and production water, wherein the device comprises the following components: the first inlet of the production separator is connected with the outlet of the production wellhead through a production manifold; the crude oil production output system comprises a crude oil output pump, wherein the input end of the crude oil output pump is connected with the oil phase outlet of the production separator, and the output end of the crude oil output pump is connected with an output sea pipe; the production water treatment system comprises a coalescence degassing tank, a first inlet of the coalescence degassing tank is connected with a water phase outlet of the production separator, a water phase outlet of the coalescence degassing tank is connected with a production water sea drainage port, and a shaft displacement system comprises a kill pump and a diesel tank, wherein the input end of the kill pump is connected with an outlet of the diesel tank; and the aeration system comprises an aeration tank, and an outlet of the aeration tank is respectively connected with the second inlet of the production separator and the second inlet of the coalescence degassing tank. The invention can reasonably select the source of the well killing medium according to the number of the production wells of the platform, the well killing diesel oil and the consumption of the production water.
Description
Technical Field
The invention relates to a device and a method for jointly replacing a shaft by diesel oil and production water, in particular to a device and a method for jointly replacing a shaft by diesel oil and production water when an offshore high-solidification crude oil production well stops production for a long time, and belongs to the technical field of offshore oilfield equipment.
Background
In the process of offshore oilfield development, when the production of an oilfield is stopped and an oil well is shut down for a long time aiming at high-condensation-point crude oil, when the temperature of well flow is as low as the freezing point temperature of the crude oil, the crude oil is condensed in a shaft, and the pipe condensation phenomenon occurs, so that the flowing safety guarantee of the shaft and the normal production of the oilfield are greatly influenced. Therefore, for high-coagulation crude oil, when the production is stopped and the shaft is replaced, the offshore platform adopts diesel oil to replace the shaft. For the platform with more production wells, after the platform stops production, a large amount of diesel oil is needed for shaft replacement, and the diesel oil tank capacity design of the platform is often larger, so that the investment of the platform is increased.
Disclosure of Invention
Aiming at the outstanding problems, the invention provides a device and a method for jointly replacing a shaft by diesel oil and production water, the device can reasonably select the source of a kill-job medium according to the number of production wells of a platform and the using amounts of kill-job diesel oil and production water, and has high flexibility.
In order to achieve the purpose, the invention adopts the following technical scheme:
an apparatus for combined diesel and production water displacement of a wellbore comprising:
a production separator having a first inlet connected to an outlet of a production wellhead via a production manifold;
the crude oil production output system comprises a crude oil output pump, wherein the input end of the crude oil output pump is connected with the oil phase outlet of the production separator, and the output end of the crude oil output pump is connected with an output sea pipe;
the production water treatment system comprises a coalescence degassing tank, wherein a first inlet of the coalescence degassing tank is connected with a water phase outlet of the production separator, and a water phase outlet of the coalescence degassing tank is connected with a production water sea drainage port;
a wellbore displacement system comprising a kill pump and a diesel tank, wherein an input end of the kill pump is connected with an outlet of the diesel tank, an output end of the kill pump is connected with the production wellhead through a kill manifold, a first branch line is arranged between the input end of the kill pump and a water phase outlet of the production separator, a second branch line is arranged between the input end of the kill pump and the water phase outlet of the coalescence degasification tank, and the first branch line and the second branch line are configured to switch incoming flows at the inlet of the kill pump;
an aeration system comprising an aeration tank having an outlet connected to the second inlet of the production separator and the second inlet of the coalescing degasser tank, respectively, the aeration tank configured to replenish gas to the production separator and the coalescing degasser tank, maintaining operating pressure.
The device, preferably, the production water treatment system further comprises a production water booster pump and a hydrocyclone, wherein the input end of the production water booster pump is connected with the water phase outlet of the production separator, the output end of the production water booster pump is connected with the inlet of the hydrocyclone, and the water phase outlet of the hydrocyclone is connected with the first inlet of the coalescence degassing tank.
The apparatus preferably further comprises a sump tank, an inlet of the sump tank is connected to the oil phase outlet of the hydrocyclone and the coalescing and degassing tank, respectively, and an outlet of the sump tank is connected to the first inlet of the production separator.
The device, preferably, pit shaft replacement system still includes crane leg diesel tank, the export of crane leg diesel tank with the input of kill-job pump is connected, is provided with the third branch line between the two.
The device is characterized in that a water phase outlet of the production separator is connected with an input end of the kill pump through a detachable quick connector, and a water phase outlet of the coalescence degassing tank is connected with the kill pump through a detachable quick connector.
The device, preferably, still be provided with the test manifold between production wellhead and the production separator, be provided with heterogeneous flowmeter on the test manifold.
The device is characterized in that a choke and a production wing valve are arranged between the production wellhead and the production manifold, and the production wing valve is configured to cut off the production flow after the platform stops.
Based on the device for jointly replacing the shaft by the diesel oil and the production water, the invention also provides an operation method of the device, which comprises the following steps:
1) When the platform is stopped, a shut-off valve between the production manifold and the first inlet of the production separator, a shut-off valve between the oil phase outlet of the production separator and the input of the crude oil export pump, a shut-off valve between the output of the crude oil export pump and the export sea pipe, a shut-off valve between the water phase outlet of the production separator and the first inlet of the coalescence degasser tank, and a shut-off valve between the water phase outlet of the coalescence degasser tank and the production water discharge port are automatically closed correspondingly;
2) Closing a valve between an outlet of the diesel tank and an input of the kill pump, connecting the first branch line between an aqueous phase outlet of the production separator and the input of the kill pump, and closing a first branch valve on the first branch line, connecting the second branch line between an aqueous phase outlet of the coalescing degasser tank and the input of the kill pump, and opening a second branch valve on the second branch line, opening a valve between the aeration system and a second inlet of the coalescing degasser tank, opening a valve between the kill pump outlet and the kill manifold, and opening a valve between the kill manifold and the production wellhead;
3) Activating the kill pump, closing a second branch valve between an aqueous phase outlet of the coalescing degasser tank and an input of the kill pump, closing a valve between the aeration system and a second inlet of the coalescing degasser tank when the liquid level in the coalescing degasser tank drops to a low level;
4) Opening a first branch valve on the first branch pipeline between a water phase outlet of the production separator and an input end of the kill pump, enabling a valve between the gas charging system and a second inlet of the production separator to be in an open state, closing the first branch valve on the first branch pipeline when an oil-water interface in the production separator is reduced to a low liquid level, and closing the valve between the gas charging system and the second inlet of the production separator;
5) Opening a valve between the diesel tank and an input end of the kill pump, and taking into account flow changes between an outlet of the kill pump and the kill manifold, and shutting down the kill pump when replacement of the wellbore is complete.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. according to the invention, after the platform stops production, when the shaft replacement is carried out, two mediums of production water and diesel oil can be selected for the shaft replacement, so that the residual production water on the platform after the platform stops is fully utilized, the consumption of the diesel oil can be saved, the tank capacity of the diesel oil storage tank of the platform is correspondingly reduced, the area of the platform is reduced, and the investment of the platform is reduced.
2. According to the invention, the first branch pipeline between the water phase outlet of the production separator and the inlet of the kill pump is connected by adopting the detachable quick connector, the second branch pipeline between the water phase outlet of the coalescence degassing tank and the inlet of the kill pump is connected by adopting the detachable quick connector, when the platform stops production and needs well shaft replacement, the connection can be quickly carried out, and when the platform is normally produced, the quick connector is detached, so that the safe production can be ensured.
3. The invention can reasonably select the source of the killing medium according to the number of the production wells of the platform and the consumption of the killing diesel oil and the production water, and has high flexibility.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for combined displacement of a wellbore with diesel and production water according to an embodiment of the present invention;
the labels in the figure are as follows:
1-diesel tank; 2-crane leg diesel tank; 3-production of a manifold; 4-testing the manifold; 5-a multiphase flow meter; 6-production separator; 7-crude oil export pump; 8-a coalescing degassing tank; 9-a hydrocyclone; 10-production water booster pump; 11-a sump oil tank; 12-production wellhead; 13-a kill pump; 14-a flow meter; 15-production of wing valves; 16-a kill manifold; 17-a nozzle tip; 18-an inflation tank; 19-a flare system; 20-external transport of sea pipes; 21-sea water discharging port for production water; 22-evacuation system.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer and more complete, the technical solutions of the present invention are described below clearly, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
As shown in fig. 1, the present invention provides a device for combined displacement of a well bore by diesel and production water, comprising the following components: a production separator 6, a first inlet of the production separator 6 being connected to an outlet of the production wellhead 12 via a production manifold 3; the crude oil production output system comprises a crude oil output pump 7, wherein the input end of the crude oil output pump 7 is connected with an oil phase outlet of the production separator 6, and the output end of the crude oil output pump 7 is connected with an output sea pipe 20; the production water treatment system comprises a coalescence degasification tank 8, wherein a first inlet of the coalescence degasification tank 8 is connected with a water phase outlet of a production separator 6, a water phase outlet of the coalescence degasification tank 8 is connected with a production water sea drainage port 21, the shaft replacement system comprises a kill pump 13 and a diesel tank 1, an input end of the kill pump 13 is connected with an outlet of the diesel tank 1, an output end of the kill pump 13 is connected with a production well mouth 12 through a kill manifold 16, a first branch pipeline is arranged between the input end of the kill pump 13 and the water phase outlet of the production separator 6, a second branch pipeline is arranged between the input end of the kill pump 13 and the water phase outlet of the coalescence degasification tank 8, and the first branch pipeline and the second branch pipeline are configured to switch inflow at the inlet of the kill pump 13; an aeration system comprising an aeration tank 18, an outlet of the aeration tank 18 being connected to a second inlet of the production separator 6 and a second inlet of the coalescing degassing tank 8, respectively, the aeration tank 18 being configured to replenish the production separator 6 and the coalescing degassing tank 8 with gas, maintaining the operating pressure. The invention can reasonably select the source of the killing medium according to the number of the production wells of the platform and the consumption of the killing diesel oil and the production water, and has high flexibility.
In a preferred embodiment of the invention, the process water treatment system further comprises a process water booster pump 10 and a hydrocyclone 9, the input of the process water booster pump 10 being connected to the aqueous phase outlet of the process separator 6, the output of the process water booster pump 10 being connected to the inlet of the hydrocyclone 9, the aqueous phase outlet of the hydrocyclone 9 being connected to the first inlet of the coalescing degasser tank 8.
In a preferred embodiment of the invention, a sump tank 11 is also included, the inlet of the sump tank 11 being connected to the oil phase outlet of the hydrocyclone 9 and the coalescing degasser tank 8, respectively, and the outlet of the sump tank 11 being connected to the first inlet of the production separator 6.
In a preferred embodiment of the invention, the wellbore displacement system further comprises a crane leg diesel tank 2, the outlet of the crane leg diesel tank 2 being connected to the input of the kill pump 13, with a third branch line being provided therebetween.
In a preferred embodiment of the invention, the aqueous phase outlet of the production separator 6 is connected to the input of the kill pump 13 by means of a detachable quick coupling, and the aqueous phase outlet of the coalescing degasser tank 8 is connected to the kill pump 13 by means of a detachable quick coupling.
In a preferred embodiment of the invention, a test manifold 4 is also provided between the production wellhead 12 and the production separator 6, the test manifold 4 having a multiphase flow meter 5 disposed thereon.
In a preferred embodiment of the invention, a choke 17 and a production wing valve 15 are arranged between the production wellhead 12 and the production manifold 3, the production wing valve 15 being configured to shut off the production flow after the platform has been stopped.
In a preferred embodiment of the present invention, the gas stored in the aeration tank 18 is an inert gas such as nitrogen, argon, or the like.
In a preferred embodiment of the present invention, a valve is disposed between each two connected components of the device to facilitate control of the movement of fluid between the two components.
Based on the device for combining diesel oil and production water to arrange a shaft, the invention also provides an operation method of the device, which comprises the following steps:
1) When the platform is stopped, a shut-off valve between the production manifold 3 and the first inlet of the production separator 6, a shut-off valve between the oil phase outlet of the production separator 6 and the input end of the crude oil export pump 7, a shut-off valve between the output end of the crude oil export pump 7 and the export sea pipe 20, a shut-off valve between the water phase outlet of the production separator 6 and the first inlet of the coalescence degasser tank 8, and a shut-off valve between the water phase outlet of the coalescence degasser tank 8 and the production water drainage port 21 are automatically closed correspondingly;
2) Closing a valve between an outlet of the diesel tank 1 and an input end of the kill pump 13, connecting a first branch pipeline between a water phase outlet of the production separator 6 and the input end of the kill pump 13, closing the first branch valve on the first branch pipeline, connecting a second branch pipeline between a water phase outlet of the coalescing degasification tank 8 and the input end of the kill pump 13, opening a second branch valve on the second branch pipeline, opening a valve between the aeration system and a second inlet of the coalescing degasification tank 8, and opening a valve between an outlet of the kill pump 13 and the kill manifold 16, and a valve between the kill manifold 16 and the production wellhead 12;
3) Starting the kill pump 13, closing the second branch valve between the outlet of the aqueous phase of the coalescing degassing tank 8 and the input of the kill pump 13, closing the valve between the aeration system and the second inlet of the coalescing degassing tank 8, when the level of liquid in the coalescing degassing tank 8 falls to a low level;
4) Opening a first branch valve on a first branch pipeline between a water phase outlet of the production separator 6 and an input end of the kill pump 13, enabling a valve between the aeration system and a second inlet of the production separator 6 to be in an open state, closing the first branch valve on the first branch pipeline when an oil-water interface in the production separator 6 is reduced to a low liquid level, and closing the valve between the aeration system and the second inlet of the production separator 6;
5) The valve between the diesel tank 1 and the input of the kill pump 13 is opened and the kill pump 13 is shut down when the replacement of the wellbore is complete, taking into account the flow change between the outlet of the kill pump 13 and the kill manifold 16.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. An apparatus for the combined displacement of a wellbore with diesel and production water, comprising:
a production separator (6), a first inlet of the production separator (6) being connected to an outlet of a production wellhead (12) via a production manifold (3);
the crude oil production output system comprises a crude oil output pump (7), wherein the input end of the crude oil output pump (7) is connected with the oil phase outlet of the production separator (6), and the output end of the crude oil output pump (7) is connected with an output sea pipe (20);
production water treatment system comprising a coalesced degassing tank (8), a first inlet of the coalesced degassing tank (8) being connected to an aqueous phase outlet of the production separator (6), an aqueous phase outlet of the coalesced degassing tank (8) being connected to a production water drainage opening (21),
a wellbore displacement system comprising a kill pump (13) and a diesel tank (1), the input of the kill pump (13) being connected to the outlet of the diesel tank (1), the output of the kill pump (13) being connected to the production wellhead (12) by a kill manifold (16), a first branch line being provided between the input of the kill pump (13) and the aqueous phase outlet of the production separator (6), a second branch line being provided between the input of the kill pump (13) and the aqueous phase outlet of the coalescing degasser tank (8), the first branch line and the second branch line being configured to switch the flow at the inlet of the kill pump (13);
aeration system comprising an aeration tank (18), an outlet of said aeration tank (18) being connected to a second inlet of said production separator (6) and a second inlet of said coalescing degassing tank (8), respectively, said aeration tank (18) being configured to replenish said production separator (6) and said coalescing degassing tank (8) with gas, maintaining an operating pressure.
2. The apparatus according to claim 1, wherein the process water treatment system further comprises a process water booster pump (10) and a hydrocyclone (9), an input of the process water booster pump (10) being connected to the aqueous phase outlet of the production separator (6), an output of the process water booster pump (10) being connected to an inlet of the hydrocyclone (9), an aqueous phase outlet of the hydrocyclone (9) being connected to the first inlet of the coalescence degasser tank (8).
3. The apparatus according to claim 2, further comprising a sump tank (11), the inlet of the sump tank (11) being connected to the oil phase outlets of the hydrocyclone (9) and the coalescing degasser tank (8), respectively, the outlet of the sump tank (11) being connected to the first inlet of the production separator (6).
4. The apparatus according to claim 1, wherein the wellbore displacement system further comprises a crane leg diesel tank (2), an outlet of the crane leg diesel tank (2) being connected to an input of the kill pump (13), a third branch line being provided therebetween.
5. The apparatus according to claim 1, characterized in that a detachable quick coupling is used between the water phase outlet of the production separator (6) and the input of the kill pump (13), and a detachable quick coupling is used between the water phase outlet of the coalescing degassing tank (8) and the kill pump (13).
6. An arrangement according to claim 1, characterized in that a test manifold (4) is also arranged between the production wellhead (12) and the production separator (6), the test manifold (4) being provided with a multiphase flow meter (5).
7. The apparatus according to claim 1, characterized in that between the production wellhead (12) and the production manifold (3) there are arranged a choke (17) and a production wing valve (15), the production wing valve (15) being configured to shut off the production flow after the platform has been stopped.
8. A method of operating a device according to any of claims 1 to 7, comprising the steps of:
1) When the platform is stopped, the shut-off valve between the production manifold (3) and the first inlet of the production separator (6), the shut-off valve between the oil phase outlet of the production separator (6) and the input of the crude oil export pump (7), the shut-off valve between the output of the crude oil export pump (7) and the export sea pipe (20), the shut-off valve between the water phase outlet of the production separator (6) and the first inlet of the coalescence degasser tank (8), and the shut-off valve between the water phase outlet of the coalescence degasser tank (8) and the production water drainage port (21) are automatically closed respectively;
2) -closing the valve between the outlet of the diesel tank (1) and the input of the kill pump (13), -connecting the first branch line between the aqueous phase outlet of the production separator (6) and the input of the kill pump (13) and closing the first branch valve on the first branch line, -connecting the second branch line between the aqueous phase outlet of the coalescing degasser tank (8) and the input of the kill pump (13) and opening the second branch valve on the second branch line, -opening the valve between the aeration system and the second inlet of the coalescing degasser tank (8), -opening the valve between the outlet of the kill pump (13) and the kill manifold (16), the valve between the kill manifold (16) and the production wellhead (12);
3) -activating the kill pump (13), closing a second branch valve between the outlet of the aqueous phase of the coalescing degasser tank (8) and the input of the kill pump (13), closing a valve between the aeration system and a second inlet of the coalescing degasser tank (8), when the level of the liquid in the coalescing degasser tank (8) drops to a low level;
4) Opening a first branch valve on the first branch line between a water phase outlet of the production separator (6) and an input end of the kill pump (13), leaving a valve between the gas charging system and a second inlet of the production separator (6) in an open state, closing the first branch valve on the first branch line when an oil-water interface in the production separator (6) falls to a low liquid level, and closing the valve between the gas charging system and the second inlet of the production separator (6);
5) Opening a valve between the diesel tank (1) and the input of the kill pump (13) and taking into account the flow change between the kill pump (13) outlet and the kill manifold (16), and shutting down the kill pump (13) when replacement of the wellbore is complete.
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| CN202110493605.9A CN113153236B (en) | 2021-05-07 | 2021-05-07 | Device and method for jointly replacing shaft by diesel oil and production water |
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| CN202110493605.9A CN113153236B (en) | 2021-05-07 | 2021-05-07 | Device and method for jointly replacing shaft by diesel oil and production water |
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| CN113153236B true CN113153236B (en) | 2022-12-02 |
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