CN1693658A - Measuring method of under well oil, gas and water three-phase flow and its device - Google Patents

Abstract

This invention discloses a measuring method of oil, gas, water three-phase flow under well. The feature is that a tube testing segment is used, a heating pole is set at inside diameter, heater and two temperature transducer are set above heating-phase, differential pressure transducer and pressure transducer are set above the round tube testing segment. Pressure and differential pressure of the fluid are tested by pressure transducer and differential pressure transducer when the three-phase flow into the tube testing segment, then the three flux can be got by the heater according to the temperature and heat equilibrium theory. This invention can be used to on-line monitoring of well oil, gas and water, it is stable and reliable, and testing precise is high.

Description

The measuring method of downhole oil, gas, water three-phase flow and device thereof

Technical field

The invention belongs to the Petroleum Production technical field, further relate to a kind of downhole gas, water, oily flow-measuring method and device thereof.

Background technology

Downhole gas, water, oily flow are extremely important parameters for oil well, well testing, production logging, and present existing certain methods is measured the cumulative volume oil mass as turbine flowmeter, and still do not had reliably for the measurement of gas liquid ratio, oil-water ratio, accurately method.Because down-hole pressure is up to more than the 10Mp, and temperature is up to more than 100 degrees centigrade, available flow-measuring method no longer is suitable for the measurement of downhole gas, water, oily flow on many ground, and up to now, the flow measurement of downhole gas, water, oil is still a technical barrier.

Summary of the invention

The objective of the invention is to, the measuring method and the device thereof of a kind of downhole oil, gas, water three-phase flow is provided, this method and device thereof can on-line continuous be measured downhole gas, water, oily flow.To solve the technical barrier that exists in above-mentioned present oil well, well testing, the production logging.

To achieve these goals, the technical scheme that the present invention takes is, a kind of downhole oil, gas, the measuring method of water three-phase flow, it is characterized in that, this method is used a pipe test section, below this test section, be provided with a heating pole, above the heating pole, be provided with heater and two temperature pick ups, above the pipe test section, also be provided with differential pressure pick-up and pressure sensor, downhole oil, gas, water three-phase flow enters this pipe test section, pressure sensor and differential pressure pick-up are measured the pressure and the pressure reduction of fluid, and heater can obtain oil according to the temperature of heating pole and the temperature difference of heat balance principle and two temperature pick up, gas, water three-phase flow.

Realize the device of said method, comprise a pipe test section, oil gas aqueous mixtures flow export is arranged on the pipe test section, it is characterized in that, below this test section, be provided with a heating pole, be provided with heater above the heating pole, the two ends of heater are respectively arranged with first temperature pick up and second temperature pick up, are provided with differential pressure pick-up and pressure sensor above test section, above-mentioned parts are drawn outside the test section respectively, and are connected with a microprocessor.

Method of the present invention and device thereof can be used for the flow on-line measurement of oil well downhole oil, gas, water, have the characteristics stable, reliable, that certainty of measurement is high.

Description of drawings

Fig. 1 is a structural principle schematic diagram of the present invention.

Do the present invention is described in further detail below in conjunction with accompanying drawing and measuring principle.

The specific embodiment

Referring to Fig. 1, device of the present invention uses a pipe test section 1, the below of the internal diameter of this test section 1 is provided with a heating pole 2, is provided with heater 5 above heating pole 2, and the both sides of heater 5 are respectively arranged with first temperature pick up 3 and second temperature pick up 4.Be provided with differential pressure pick-up and 6 pressure sensors 7 above test section 1, above-mentioned parts are drawn outside the test section 1 respectively, and are connected with a microprocessor 8.When downhole oil, gas, water three-phase flow enter this pipe test section, can carry out the measurement of oil, gas, water three-phase flow,

Its measuring method is:

By the pressure P and the pressure differential deltap P of pressure sensor 7 and differential pressure pick-up 6 measurement fluids, pressure differential deltap P is made up of two parts:

ΔP＝ΔP _f+ρ _mgh (1)

In the formula, ρ _mBe oil gas aqueous mixtures density, g is an acceleration of gravity, and h is the differential pressure measurement height, Δ P _fBe frictional resistance pressure reduction; Frictional resistance pressure reduction is:

${\mathrm{\ΔP}}_f=2f\frac{l}{d}{\mathrm{\ρ}}_m{u_m}^2---\left(2\right)$

In the formula, f is a friction factor, and l is for measuring the pressure reduction height, and d is the pipe diameter, ρ _mBe oil gas aqueous mixtures density, u _mBe oil gas aqueous mixtures speed;

Measure the temperature of heating pole 2 again, when oil, gas, water three-phase mixture flowed from lower to upper, heating pole 2 was cooled, its HEAT TRANSFER LAW is:

$\frac{Q_1}{\mathrm{\Δt}\×k_m}=C{\left(\frac{u_m{\mathrm{\ρ}}_m}{{\mathrm{\μ}}_m}\right)}^a{\left(\frac{C_p{\mathrm{\μ}}_m}{k_m}\right)}^b---\left(3\right)$

In the formula, μ _mBe oil gas aqueous mixtures viscosity, u _mBe oil gas aqueous mixtures speed, C _pBe mixture specific heat, k _mBe the mixture coefficient of thermal conductivity, Δ t is the temperature difference between pipe and the fluid, and a, b are constant, Q ₁Heating power for the heating pole.

Wherein, k _m=k _oα _o+ k _wα _w+ k _gα _g(4)

In the formula, α _o, α _w, α _gBe Oil, Water, Gas phase ratio, k _o, k _w, k _gBe the Oil, Water, Gas coefficient of thermal conductivity.

When three-phase oil gas aqueous mixtures flow through heater 5, fluid was heated, and according to heat balance principle, can obtain:

Q ₂＝C _pρ _m×u _m×A×Δt (5)

In the formula, Q ₂Be the heating power of heater, u _mBe oil gas aqueous mixtures speed, A is a circulation area, and Δ t is that (temperature that is temperature pick up 4 is Δ t for temperature difference between temperature pick up 3 and the temperature pick up 4 ₄, the temperature of temperature pick up 3 is Δ t ₃, Δ t=Δ t then ₄-Δ t ₃); And have:

ρ _m＝ρ _oα _o+ρ _wα _w+ρ _gα _g (6)

In the formula, ρ _o, ρ _w, ρ _gBe oil, gas, water density;

The phase ratio summation of oil, gas, water is 1 in addition, that is:

α _o+α _w+α _g＝1 (7)

By the above-mentioned equation of microprocessor 8 simultaneous solutions, can obtain the flow of Oil, Water, Gas.

Claims (3)

1. the measuring method of a downhole oil, gas, water three-phase flow, it is characterized in that, this method is used a pipe test section, below this test section, be provided with a heating pole, on the heating pole, be provided with heater and two temperature pick ups, above the pipe test section, also be provided with differential pressure pick-up and pressure sensor, above-mentioned parts are drawn outside the test section respectively, and be connected with a microprocessor, when downhole oil, gas, water three-phase flow enter this pipe test section, can carry out the measurement of oil, gas, water three-phase flow; Its measurement is carried out according to the following steps:

By the pressure p and the pressure differential deltap p of pressure sensor and differential pressure pick-up measurement fluid, pressure differential deltap p obtains by following formula:

Δp＝Δp _f+ρ _mgh (1)

In the formula, ρ _mBe oil gas aqueous mixtures density, g is an acceleration of gravity, and h is the differential pressure measurement height, Δ p _fBe frictional resistance pressure reduction; Frictional resistance pressure reduction is:

$\mathrm{\Δ}{P}_f=2f\frac{l}{d}{\mathrm{\ρ}}_m{u_m}^2---\left(2\right)$

In the formula, f is a friction factor, and l is a test section pressure reduction height, and d is the pipe diameter, ρ _mBe oil gas aqueous mixtures density, u _mBe oil gas aqueous mixtures speed;

Measure the temperature of heating pole again, when the oil gas water three phase mixture flowed from lower to upper, the heating pole was cooled, its HEAT TRANSFER LAW is:

$\frac{Q_1}{\mathrm{\Δt}\×k_m}=C{\left(\frac{u_m{\mathrm{\ρ}}_m}{{\mathrm{\μ}}_m}\right)}^a{\left(\frac{C_p{\mathrm{\μ}}_m}{k_m}\right)}^b---\left(3\right)$

In the formula, μ _mBe oil gas aqueous mixtures viscosity, u _mBe oil gas aqueous mixtures speed, C _pBe mixture specific heat, k _mBe the mixture coefficient of thermal conductivity, Δ t is the temperature difference between pipe and the fluid, and a, b are constant, Q ₁Heating power for the heating pole;

Wherein, k _m=k _oα _o+ k _wα _w+ k _gα _g(4)

In the formula, α _o, α _w, α _gBe Oil, Water, Gas phase ratio, k _o, k _w, k _gBe the Oil, Water, Gas coefficient of thermal conductivity;

When three-phase oil gas aqueous mixtures flow through heater 5, fluid was heated, and according to heat balance principle, can obtain:

Q ₂＝C _pρ _m×u _m×A×Δt (5)

In the formula, Q ₂Be the heating power of heater, u _mBe oil gas aqueous mixtures speed, A is a circulation area, and Δ t is two temperature differences between the temperature pick up; And have:

ρ _m＝ρ _oα _o+ρ _wα _w+ρ _gα _g (6)

In the formula, ρ _o, ρ _w, ρ _gBe oil, gas, water density;

The phase ratio summation of oil, gas, water is 1 in addition, that is:

α _o+α _w+α _g＝1 (7)

By the above-mentioned equation of microprocessor simultaneous solution, can obtain the flow of Oil, Water, Gas.

2. downhole oil, gas, the measurement mechanism of water three-phase flow, comprise a pipe test section (1), oil gas aqueous mixtures flow export is arranged on the pipe test section, it is characterized in that, internal diameter in this test section (1) below is provided with a heating pole (2), top at heating pole (2) is provided with heater (5), the both sides of heater (5) are respectively arranged with first temperature pick up (3) and second temperature pick up (4), be provided with differential pressure pick-up and (6) pressure sensor (7) in the top of test section (1), above-mentioned parts are drawn respectively outside the test section (1), and are connected with a microprocessor (8).

3. device as claimed in claim 2 is characterized in that, described first temperature pick up (3) and second temperature pick up (4) are identical temperature pick up.