CN2394225Y - Automatic oil metering and gas testing device for single well - Google Patents

Abstract

The utility model discloses an automatic oil metering and gas testing device for single well, which comprises a separating pot main body, wherein, both sides of the upper part of the separating pot main body are respectively provided with mixing fluid inlet valves, exhaust valves and gas flow meters, and the bottom of the separating pot main body is provided with a liquid discharging valve. The lower side part of the separating pot is provided with a differential pressure transmitter, and the high pressure chamber and the low pressure chamber of the differential pressure transmitter are communicated with the separating pot by a metal guide pipe, and a guide pipe with a liquid level meter is horizontally arranged above the differential pressure transmitter and is respectively connected with the separating pot and a guide pipe of the low pressure chamber of the differential pressure transmitter which respectively outputs signals to a computer. The utility model has the characteristics of speediness and exactness, and can automatically meter the oil production, the gas production, the liquid production and the moisture percentage of a single-mouth well.

Description

The automatic gauge gas metering device of novel individual well

The utility model is the automatic gauge gas metering device of novel individual well that the petroleum metering station is used.

At present, domestic each petroleum metering station all adopts glass tube oil gauge survey gas metering separator that individual well is carried out gauge gas metering, artificial chemical examination crude oil water content need be aided with this device gauge gas metering and just production fluid amount and oil offtake can be conversed, because the sample of getting can not indicate the profit component ratio of experiment crude water mixed liquor, therefore production fluid amount, oil offtake and the water percentage that converses be out of true all, error is big, labour intensity is big, the cycle is long, can not satisfy production, management expectancy.

The purpose of this utility model provides the automatic gauge gas metering device of a kind of novel individual well, and it can measure production fluid amount, water percentage, oil offtake and the gas production rate of individual well automatically, accurately, fast, no longer needs manually to chemically examine water percentage.

For achieving the above object, technical solution of the present utility model is finished like this: the automatic gauge gas metering device of novel individual well, comprise the separating tank main body, a mixed flow inlet valve and a vent valve are housed respectively at an upper portion thereof, gas flow is housed behind the vent valve to be taken into account separating tank bottom a tapping valve is housed, the differential pressure transmitter high-low pressure chamber of side wall arrangement, be communicated with separating tank by conduit, top by described differential pressure transmitter, be horizontally disposed with the metal catheter that has liquid level gauge, its two ends are connected to respectively on separating tank and the differential pressure transmitter low-pressure cavity conduit, send into computing machine by the differential pressure transmitter output signal.

The advantage that the utility model is had compared to existing technology is: original glass tube oil gauge is surveyed the differential pressure transmitter that the glass tube linker of gas metering separator is changed system into 10KPa, and by level the metal tube have liquid level gauge is installed and is connected with the conduit of differential pressure transmitter respectively, rise to liquid level gauge conduit place when separating tank level, liquid flows into the low-pressure cavity of differential pressure transmitter immediately, link to each other with computing machine by differential pressure transmitter, the data that provide with differential pressure transmitter and certain digital model have automatically, accurately, measure the production fluid amount of single port oil well fast, water percentage, oil offtake.

Description of drawings is as follows:

Fig. 1 is the structural representation of the automatic gauge gas metering device of novel individual well.

Below in conjunction with accompanying drawing embodiment this novel structure and duty is made specific description.

By shown in Figure 1, the automatic gauge gas metering device of novel individual well, it comprises a separating tank main body 1, the inlet valve 8 of a gas liquid mixture that is connected with individual well is installed above the separating tank main body, be higher than gas liquid mixture inlet valve 8 places on separating tank main body top a vent valve 2 and gas meter 3 are installed, after being installed in drain tap 2, in the separating tank bottom tapping valve 7 is housed, at the outside differential pressure transmitter 6 of separating tank main body 1 downside, the low-pressure cavity of differential pressure transmitter 6 communicates with separating tank top inner chamber with metal tube, high pressure chest contacts with liquid phase in the separating tank, the 50cm place installation one horizontal metal conduit 5 that has liquid level gauge 4 communicates with the metal catheter of differential pressure transmitter 6 low-pressure cavity above separating tank skin differential pressure transmitter 6, the other end communicates with separating tank main body 1 inner chamber, and the output signal of differential pressure transmitter 6 is sent into computing machine.

The automatic gauge gas metering device of novel individual well duty: before measuring gas liquid mixture inflow entrance valve 8 cuts out, open tapping valve 7 and vent valve 2, with the liquids and gases emptying in the separating tank main body 1, close tapping valve 7 then, open gas liquid mixture inflow entrance valve 8, the gas-liquid mixture fluid of individual well oil is flowed in the separating tank main body 1.Rock gas separates the back and flows away through gas meter 3 by vent valve 2 from fluid-mixing, oil-water mixture is in the accumulation of separating tank main body 1 bottom, and before liquid level arrived differential pressure transmitter 6B place, differential pressure transmitter 6 pressure at two ends equated, differential pressure is zero, and the computing machine output signal is constant.After liquid level arrived the B place, pressure readings began to increase, and it is T that computing machine is write down the moment that begins to increase ₁And its homodyne is pressed reading D ₁Along with the increase that flows into separating tank liquid, liquid level raises, and differential pressure transmitter 6 readings continue to increase.When liquid level rises to liquid level gauge aperture 4, there is liquid to flow into the low-pressure cavity of differential pressure transmitter 6 immediately, it is the moment T of liquid level when rising to A at this moment that the reading D of differential pressure transmitter output descends suddenly ₂, T ₂The previous reading D of time difference pressure transmitter ₂And the weight of mixing fluid column between A, the B is directly proportional.

If the distance that A, B are 2 is H, it is a certain value to a certain definite device, obviously the weight of fluid column should with D ₂With D ₁The difference direct ratio.That is:

W _MixH=K (D ₂-D ₁)

In the formula:

W _MixWeight density for mixed liquor

K is scale-up factor (a device constant)

The K value can be by mixed liquor be determined during for pure water

If:

W _OilWeight density for crude oil

W _WaterWeight density for water

P _OilOil content for mixed liquor

P _WaterWater percentage for mixed liquor

Then:

W _Mix=W _OilP _Oil+ W _WaterP _Water

P _Oil+ P _Water=1

W _MixH=K (D ₂-D ₁)

Separating system of equations can get:

If:

Then:

P _Water=K ₁(D ₂-D ₁)-K ₂

To a certain definite device H and K value is known definite value, W _Oil, W _WaterCan determine by physics or chemical method a certain oil well, therefore to the P of a certain oil well _WaterValue can be by D ₂, D ₁Be worth definitely fully, and then can obtain P _Oil

The available following formula of production fluid amount calculates: $Q=\frac{\mathrm{SH}}{T_1-T_2}$

In the formula:

Q is the volume liquid measure

S is the separating tank cross-sectional area

T ₁For measuring zero-time

T ₂For measuring the termination time

Oil offtake is:

Q _Oil=1-P _Water

Gas production rate is:

This device is to measurement of water ratio mistake≤± 2%, production fluid amount error≤± 0.5%, oil offtake error≤± 2%.

Claims (1)

1, the automatic gauge gas metering device of a kind of novel individual well, comprise the separating tank main body, a mixed flow inlet valve and a vent valve are housed respectively at an upper portion thereof, gas flow is housed behind the vent valve to be taken into account separating tank bottom a tapping valve is housed, the differential pressure transmitter high-low pressure chamber of side wall arrangement, be communicated with separating tank by conduit, it is characterized in that top by differential pressure transmitter (6), be horizontally disposed with the metal catheter (5) that has liquid level gauge (4), its two ends are connected to respectively on separating tank (1) and differential pressure transmitter (6) the low-pressure cavity conduit, send into computing machine by differential pressure transmitter (6) output signal.