Offshore oilfield polymer viscosity measuring device

Abstract

The utility model discloses an offshore oilfield polymer viscosity measuring device which comprises a mother liquor control mechanism arranged on a mother liquor pipeline, a water injection control mechanism arranged on a water injection pipeline and a detection loop connected with a main loop in parallel, the mother liquor control mechanism comprises a mother liquor regulating valve and a mother liquor flowmeter; the water injection control mechanism comprises a water injection regulating valve and a water injection flowmeter; a main loop high-pressure valve is arranged on the main loop; the detection loop comprises a loop inlet pipeline, a loop outlet pipeline and a detection pipeline communicated with the loop inlet pipeline and the loop outlet pipeline; the loop inlet pipeline is provided with a loop inlet valve; the loop outlet pipeline is provided with a loop outlet valve; and one end of the detection pipeline is connected with the viscometer. According to the utility model, when the polymer solution is injected at high pressure for production, the viscosity of the flowing polymer solution and the viscosity of the static polymer solution are detected on line under the condition of not stopping production, and the measurement requirement of the polymer solution is met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to polymer viscosity measurement technical field, concretely relates to a kind of offshore oilfield polymer viscosity measuring device. BACKGROUND

[0002] During the injection of polymer solution into wellhead in offshore oilfield, the viscosity of polymer solution needs to be measured, usually a sampler is installed on high-pressure flow process, and the viscosity of polymer solution is measured in laboratory after sampling. During sampling, the viscosity is reduced due to pressure change, and the viscosity is also reduced due to oxidation reaction of the sample taken after contacting with oxygen, so the offline viscosity measurement is inaccurate.

[0003] In order to accurately measure the viscosity of polymer solution and eliminate the influence of pressure reduction and dissolved oxygen on viscosity, an online viscosity device for polymer solution applied to offshore oilfield platform is urgently needed to accurately understand the viscosity of injected polymer solution and provide accurate data support for oil reservoir development. UTILITY MODEL CONTENT

[0004] The utility model is proposed to solve the problems in the prior art, and aims to provide a kind of offshore oilfield polymer viscosity measuring device.

[0005] The utility model is implemented through the following technical solutions:

[0006] A kind of offshore oilfield polymer viscosity measuring device, including the mother liquor control mechanism being arranged on mother liquor pipeline, the water injection control mechanism being arranged on water injection pipeline and the detection loop being connected with main loop in parallel;The mother liquor control mechanism includes mother liquor regulating valve and mother liquor flowmeter;The water injection control mechanism includes water injection regulating valve and water injection flowmeter;Main loop high pressure valve is arranged on the main loop;The detection loop includes loop inlet pipeline, loop outlet pipeline and detection pipeline communicated with loop inlet pipeline and loop outlet pipeline;Loop inlet valve is arranged on the loop inlet pipeline;Loop outlet valve is arranged on the loop outlet pipeline;Sampler is arranged in the middle section of detection pipeline, and one end of detection pipeline is connected with viscosimeter.

[0007] In the above technical solution, the outlet of the mother liquor pipeline and the water injection pipeline is communicated with the inlet of the static mixer, the outlet of the static mixer is communicated with the inlet of the main loop, and the outlet of the main loop is communicated with the wellhead unit.

[0008] In the above technical solution, the mother liquor flowmeter is arranged on one side close to the main loop;The water injection flowmeter is arranged on one side close to the main loop.

[0009] In the above technical solution, the detection loop is arranged in parallel with the main loop high pressure valve.

[0010] In the above technical solution, the connection end of the loop inlet pipe to the main loop is located at the inlet end of the main loop high-pressure valve; the connection end of the loop outlet pipe to the main loop is located at the outlet end of the main loop high-pressure valve.

[0011] In the above technical solution, the viscometer has a built-in temperature detection function.

[0012] In the above technical solution, the offshore oilfield polymer viscosity measuring device also includes a control mechanism, which includes a host computer and a PLC unit that are electrically connected to each other.

[0013] In the above technical solution, the mother liquor regulating valve, mother liquor flow meter, water injection regulating valve, water injection flow meter and viscometer are all electrically connected to the control mechanism.

[0014] The beneficial effects of this utility model are:

[0015] This invention provides an online viscosity measurement device for injecting polymer solutions used in offshore oilfield flooding into wellheads. It can detect the viscosity of the polymer solution during high-pressure injection and at rest online without interrupting production, thus meeting the requirements for polymer solution measurement and achieving the goal of understanding the true viscosity of the polymer and guiding reservoir development. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] in:

[0018] 1. Mother liquor pipeline; 2. Mother liquor regulating valve; 3. Mother liquor flow meter; 4. Water injection pipeline; 5. Water injection regulating valve; 6. Water injection flow meter; 7. Static mixer; 8. Loop inlet valve; 9. Main circuit high-pressure valve; 10. Sampler; 11. Loop outlet valve; 12. Viscometer; 13. Wellhead unit.

[0019] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 As shown, a polymer viscosity measuring device for offshore oil fields includes a mother liquid control mechanism installed on the mother liquid pipeline 1, a water injection control mechanism installed on the water injection pipeline 4, and a detection loop connected in parallel with the main circuit.

[0022] The mother liquor control mechanism comprises a mother liquor regulating valve 2 and a mother liquor flowmeter 3.

[0023] The water injection control mechanism comprises a water injection regulating valve 5 and a water injection flowmeter 6.

[0024] The main circuit is provided with a main circuit high-pressure valve 9.

[0025] The detection circuit is provided in parallel with the main circuit high-pressure valve 9, and comprises a circuit inlet pipeline, a circuit outlet pipeline and a detection pipeline in communication with the circuit inlet pipeline and the circuit outlet pipeline; the circuit inlet pipeline is provided with a circuit inlet valve 8, and the connection end of the circuit inlet pipeline with the main circuit is arranged at the inlet end of the main circuit high-pressure valve 9; the circuit outlet pipeline is provided with a circuit outlet valve 11, and the connection end of the circuit outlet pipeline with the main circuit is arranged at the outlet end of the main circuit high-pressure valve 9.

[0026] A sampler 10 is arranged at the middle section of the detection pipeline, and one end of the detection pipeline is connected with a viscometer 12.

[0027] The viscometer 12 has a temperature detection function, and the measured viscosity value and temperature value are transmitted to a PLC unit and an upper computer, so that the viscosity and temperature are realized in real time display, recording and inquiry.

[0028] The outlets of the mother liquor pipeline 1 and the water injection pipeline 4 are in communication with the inlet of a static mixer 7, the outlet of the static mixer 7 is in communication with the inlet of the main circuit, and the outlet of the main circuit is in communication with a wellhead unit 13.

[0029] The offshore oilfield polymer viscosity measuring device further comprises a control mechanism, the control mechanism comprises an upper computer and a PLC unit which are electrically connected with each other; the mother liquor regulating valve 2, the mother liquor flowmeter 3, the water injection regulating valve 5, the water injection flowmeter 6 and the viscometer 12 are electrically connected with the control mechanism, so that the on-line detection of the viscosity is realized, and the automatic adjustment and control of the viscosity are guided. The connection between the upper computer, the PLC unit and each valve, flowmeter and viscometer adopts a conventional electric control connection mode.

[0030] Working principle of the utility model:

[0031] Viscosity measurement under polymer flow:

[0032] Opening the loop inlet valve 8, then opening the loop outlet valve 11, the mixed polymer solution enters the detection loop, and after stabilizing for one minute, the loop outlet valve 11 is closed, then the loop inlet valve 8 is closed, the polymer solution in the detection loop is static, the viscometer 12 measures the viscosity value and temperature value of the static polymer solution, and the PLC unit collects the polymer viscosity and temperature; the upper computer displays and records the polymer viscosity and temperature; sampling is carried out from the sampling port, and the rotating viscometer is used to measure in the laboratory, so that the sampling and measurement function is realized.

[0033] Polymer solution viscosity measurement under static state:

[0034] Opening the loop inlet valve 8, then opening the loop outlet valve 11, the mixed polymer solution enters the detection loop, and after stabilizing for one minute, the loop outlet valve 11 is closed, then the loop inlet valve 8 is closed, the polymer solution in the detection loop is static, the viscometer 12 measures the viscosity value and temperature value of the static polymer solution, and the PLC unit collects the polymer viscosity and temperature; the upper computer displays and records the polymer viscosity and temperature; sampling is carried out from the sampling port, and the rotating viscometer is used to measure in the laboratory, so that the sampling and measurement function is realized.

[0035] The polymer flooding technology development and on-site application of the offshore heavy oil field can be expanded according to the implementation requirements and technical indexes of the reservoir scheme, such as increasing the number of wellheads and expanding the number of collected data.

[0036] The online viscosity measurement process is adopted to realize online measurement of the viscosity of the polymer solution; the mother liquor regulator and the water injection regulating valve are used to adjust the mother liquor flow and the water injection flow, so that the viscosity of the polymer solution is adjusted; the PLC control system and the upper computer are used to realize automatic adjustment of the polymer viscosity; and the upper computer system is used to realize process monitoring and viscosity data recording and inquiry.

[0037] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection, it can be mechanical connection, or electrical connection, it can be direct connection, or indirect connection through intermediate medium, or internal connection of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0038] The applicant declares that the above description is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and it should be understood by those skilled in the art that any changes or replacements within the technical scope disclosed by the present application can be easily thought out by any person skilled in the art, and all of them fall within the protection scope and disclosure scope of the present application.

Claims

1. An offshore oilfield polymer viscosity measurement apparatus, characterised in that: The device comprises a mother liquor control mechanism arranged on a mother liquor pipeline (1), a water injection control mechanism arranged on a water injection pipeline (4), and a detection loop in parallel with a main loop; the mother liquor control mechanism comprises a mother liquor regulating valve (2) and a mother liquor flowmeter (3); the water injection control mechanism comprises a water injection regulating valve (5) and a water injection flowmeter (6); the main loop is provided with a main loop high-pressure valve (9); the detection loop comprises a loop inlet pipeline, a loop outlet pipeline, and a detection pipeline in communication with the loop inlet pipeline and the loop outlet pipeline; the loop inlet pipeline is provided with a loop inlet valve (8); the loop outlet pipeline is provided with a loop outlet valve (11); a sampler (10) is arranged at the middle section of the detection pipeline, and one end of the detection pipeline is connected with a viscometer (12).

2. The offshore oilfield polymer viscosity measurement apparatus of claim 1, wherein: The outlets of the mother liquor pipeline (1) and the water injection pipeline (4) are in communication with the inlet of a static mixer (7), the outlet of the static mixer (7) is in communication with the inlet of the main loop, and the outlet of the main loop is in communication with a wellhead unit (13).

3. The offshore oilfield polymer viscosity measurement apparatus of claim 1, wherein: The mother liquor flowmeter (3) is arranged on the side close to the main loop; and the water injection flowmeter (6) is arranged on the side close to the main loop.

4. The offshore oilfield polymer viscosity measurement apparatus of claim 1, wherein: The detection loop is arranged in parallel with the main loop high-pressure valve (9).

5. The offshore oilfield polymer viscosity measurement apparatus of claim 1, wherein: The connection end of the loop inlet pipeline with the main loop is arranged at the inlet end of the main loop high-pressure valve (9); and the connection end of the loop outlet pipeline with the main loop is arranged at the outlet end of the main loop high-pressure valve (9).

6. The offshore oilfield polymer viscosity measurement apparatus of claim 1, wherein: The viscometer (12) has a temperature detection function.

7. The offshore oilfield polymer viscosity measurement apparatus of claim 1, wherein: The offshore oilfield polymer viscosity measuring device further comprises a control mechanism, and the control mechanism comprises an upper computer and a PLC unit which are electrically connected with each other.

8. An offshore oilfield polymer viscosity measurement apparatus according to claim 7, characterised in that: The mother liquor regulating valve (2), the mother liquor flowmeter (3), the water injection regulating valve (5), the water injection flowmeter (6), and the viscometer (12) are electrically connected with the control mechanism.

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