CN1038067C - Indexing method for oil, gas and water mixed delivery - Google Patents

Abstract

The present invention relates to an indexing method of mixed delivery of oil, gas and water, and the water content is from 5 to 100%. Firstly, pipe diameter is selected to be from 200 to 1500mm under the condition of the gas-liquid ratio within 200%, and the densities of the oil, the gas and the water are set within the density ranges of the oil, the gas and the water; secondly, the density of mixed liquid is sampled and indexed; thirdly, the liquid level height is further calculated by linear densities measured by a radiation source of a vertical axis and a receiver to measure the linear volumes of the oil, the gas and the water by a volumetric flowmeter; finally, pure oil quantity, water quantity and gas quantity are measured by an indexing device for mixed delivery of oil, gas and water, and the indexing device is designed by a functional relationship of the linear densities, the liquid level height the linear volumes, the pipe diameter and the densities of the gas, the oil and the water which are three parameters. The error of the pure oil quantity measured in the measuring method is as small as 2%.

Description

Oil, gas, water mixed delivery grading method

The present invention relates to a kind of finish highly aqueous, gas, water separately metering mix defeated grading method.

In the existing technology, under the high-moisture situation, oil, gas, water mixed delivery grading method are: a, at first directly record moisture signal by instrument, or use formula: $f_w=\frac{{\mathrm{\ρ}}_w({\mathrm{\ρ}}_{\mathrm{ow}}-{\mathrm{\ρ}}_o)}{{\mathrm{\ρ}}_{\mathrm{ow}}({\mathrm{\ρ}}_w-{\mathrm{\ρ}}_o)}$ ρ in the formula _OwFor mixing liquid density, ρ _wBe water-mass density, ρ _wBe oil density, by surveying oil, gas, waterline density value, linear density value ρ _x, come the mixed liquid density p in the replacement formula _Ow, calculate water-retention value f _w, oil mass formula M _o=ρ _OwV _OW(1-f _w) designed measuring apparatus records pure oil mass, yes uses linear density ρ _xReplace mixing liquid density, with linear volume V _xReplace mixing the long-pending V of liquid _Ow, b, the main error of pure oil mass that records like this are: ${\mathrm{\δ}}_{\mathrm{mo}}=\frac{{\mathrm{\δf}}_w}{1-f_w}$ Because water-retention value f _wObtain in the process and replace mixing liquid density, causing the water-retention value error big with linear density, pure oil mass error is big, fuel gauging is inaccurate thereby make, uniting use with worker's densitometer of the highest analyzer of water content of precision and 5/10000ths is that the error of 50% o'clock pure oil mass reaches 12% at vapour-liquid ratio GLR, at vapour-liquid ratio GLR is that 20% o'clock pure oil mass error reaches 11%, when pure liquid state is carried, water cut 〉=95% o'clock, pure oil mass error reaches 10%.

The method that the purpose of this invention is to provide a kind of water cut more accurate pure oil mass of calibration, the water yield and tolerance under the oil of 5-100%, gas, water mixed delivery state.

Key of the present invention is to adopt the measuring method of the irrelevant pure oil mass of a kind of and water-retention value, and concrete measuring method is as follows: a, at first be that to choose caliber d in 200% the time be 200-1500mm in vapour-liquid ratio, at 0.0004-0.0007 ton/rice ³Gas density changing value scope in set gas density ρ _g, at 0.8369-0.8398 ton/rice ³Pure oil density changing value scope in set a ton oil density value ρ _o, at 0.9943-0.9977 ton/rice ³Water-mass density changing value scope in set water-mass density value ρ _w, b, sampling are demarcated and are mixed the liquid density p _Vw, the linear density ρ that c, radiation source 1 and receiver 2 by the vertical-horizontal conduit axis record _x, further pass through basis ${\mathrm{\ρ}}_{\mathrm{ow}}=\frac{d\left({\mathrm{\ρ}}_{x\_}{\mathrm{\ρ}}_g\right)+{\mathrm{\ρ}}_{g}h}{h}$ Calculate liquid level, d, record the long-pending V of oil, gas, waterline gonosome by volume-displacement 3 _x, e, by linear density ρ _x, liquid level h, linear volume V _x, caliber d and gas, oil, water three parameter metric density ρ _g, ρ _o, ρ _wThe funtcional relationship of value $M_o=\frac{h}{d}\·V_x\·{\mathrm{\ρ}}_g\·\frac{h{\mathrm{\ρ}}_x-d({\mathrm{\ρ}}_w-{\mathrm{\ρ}}_g)-h{\mathrm{\ρ}}_g}{h({\mathrm{\ρ}}_w-{\mathrm{\ρ}}_g)}$ $V_g=V_x(1-\frac{({\mathrm{\ρ}}_o-{\mathrm{\ρ}}_g)h}{d({\mathrm{\ρ}}_x-{\mathrm{\ρ}}_g)+{\mathrm{\ρ}}_{g}h})$ $V_w=V_x-V_g-\frac{M_o}{{\mathrm{\ρ}}_g}$ Designed oil, gas, water mixed delivery dividing apparatus 4 record pure oil mass, the water yield and tolerance.

Error by the pure oil mass of this measurement is only relevant with five variablees, i.e. the density p of the high h of liquid level, oil, gas, water _v, ρ _g, ρ _w, and linear volume V _x, in above-mentioned five variablees, the gas density changing value is at 0.0004-0.0007 ton/rice ³Variation range in, pure oil mass variable density value is at 0.8369-0.8398 ton/rice ³Scope in, the variable density value of water is at 0.9943-0.9977 ton/rice ³In the scope, liquid level is high owing to demarcate mixed liquid density p _OwBe constant, thus there is the error of 5mm, so linear volume selects for use 0.2 grade of loading table to have 0.5% error.The error that exploitation carries viscous crude, thin oil, high wet goods complicated factor with fixed attention to cause all is included in the above-mentioned error range, by the error extreme value of getting above-mentioned arbitrary group of five variablees carry out calculating behind 32 error drifts error be 2%, the present invention only uses an oil, gas, water mixed delivery dividing apparatus, save 1 analyzer of water content, and make pure oil mass error and water-retention value irrelevant, thereby overcome it is believed that for a long time in mixing defeated state oil, gas, water can not separately measure and high moisture conveying can not reduce the idea of pure oily error.

Be described in detail technical solution of the present invention below in conjunction with accompanying drawing.

Fig. 1 is pipe element figure of the present invention.

Embodiment 1:

As Fig. 1, oil of the present invention, gas, its special character of water mixed delivery grading method are a, at first are that to choose caliber d at 200% o'clock be 720mm in vapour-liquid ratio, set gas density ρ _gIt is 0.0005 ton/meter ³, set pure oil density value ρ _gIt is 0.8369 ton/meter ³, set water-mass density value ρ _wIt is 0.9943 ton/meter ³.b, sampling is demarcated and is mixed the liquid density p _VwThe linear density ρ that c, radiation source 1 and receiver 2 by the vertical-horizontal conduit axis record _w, further pass through basis ${\mathrm{\ρ}}_{\mathrm{ow}}=\frac{d\left({\mathrm{\ρ}}_{x\_}{\mathrm{\ρ}}_g\right)+{\mathrm{\ρ}}_{g}h}{h}$ Calculate liquid level, d, record the long-pending V of oil, gas, waterline gonosome by volume-displacement 3 _x, e, by linear density ρ _x, liquid level h, linear volume V _x, caliber d and gas, oil, water three parameter metric density ρ _g, ρ _o, ρ _wThe funtcional relationship of value $M_o=-V_x\underset{d}{\overset{h}{{\mathrm{\ρ}}_o}}\frac{h{\mathrm{\ρ}}_w-d\left({\mathrm{\ρ}}_{x\_}{\mathrm{\ρ}}_g\right)-h{\mathrm{\ρ}}_g}{h({\mathrm{\ρ}}_w-{\mathrm{\ρ}}_o)}$ $V_g=V_x(1-\frac{({\mathrm{\ρ}}_x-{\mathrm{\ρ}}_g)h}{d({\mathrm{\ρ}}_x-{\mathrm{\ρ}}_g)+{\mathrm{\ρ}}_{g}h})$ $V_w=V_x-V_g-\frac{M_o}{{\mathrm{\ρ}}_o}$ Designed oil, gas, water mixed delivery dividing apparatus 4 record pure oil mass, the water yield and tolerance.

Pure as calculated oil mass error is 2%.

Embodiment 2:

As Fig. 1, oil of the present invention, gas, its special character of water mixed delivery grading method are a, at first are that to choose caliber d at 200% o'clock be 1500mm in vapour-liquid ratio, set gas density ρ _zIt is 0.0005 ton/meter ³, set pure oil density value ρ _gBe 0.8369 ton/meter, setting water-mass density value ρ is 0.9943 ton/meter ³, b, sampling are demarcated and are mixed the liquid density p _Ow, the linear density ρ that radiation source 1 and the receiver 2 of c. by the vertical-horizontal conduit axis records _x, further pass through basis ${\mathrm{\ρ}}_{\mathrm{ow}}=\frac{d\left({\mathrm{\ρ}}_{x\_}{\mathrm{\ρ}}_g\right)+{\mathrm{\ρ}}_{g}h}{h}$ Calculate liquid level, d, record the long-pending V of oil, gas, waterline gonosome by volume-displacement 3 _x, e, by linear density ρ _x, liquid level h, linear volume V _x, caliber d and gas, oil, water three parameter metric density ρ _g, ρ _o, ρ _wThe funtcional relationship of value $M_o=\frac{h}{d}{V}_x{\mathrm{\ρ}}_o\frac{h{\mathrm{\ρ}}_w-d\left({\mathrm{\ρ}}_{x\_}{\mathrm{\ρ}}_g\right)-h{\mathrm{\ρ}}_g}{h({\mathrm{\ρ}}_w-{\mathrm{\ρ}}_o)}$ $V_g=V_x(1-\frac{({\mathrm{\ρ}}_x-{\mathrm{\ρ}}_g)h}{d({\mathrm{\ρ}}_x-{\mathrm{\ρ}}_g)+{\mathrm{\ρ}}_{g}h})$ $V_w=V_x-V_g-\frac{M_o}{{\mathrm{\ρ}}_o}$ Designed oil, gas, water mixed delivery dividing apparatus 4 record pure oil mass, the water yield and tolerance.

Pure as calculated oil mass error is 1.8%.

Claims (1)

1, a kind of water cut is characterized in that at oil, gas, the water mixed delivery grading method of 5-100%

A, at first to choose caliber d 200% under with interior situation at gas liquid ratio be 200-1500mm, at 0.0004-0.0007 ton/rice ³Gas density changing value scope in set gas density ρ _g, at 0.8369-0.8398 ton/rice ³Pure oil density changing value scope in set pure oil density value ρ _o, at 0.9943-0.9977 ton/rice ³Water-mass density changing value scope in set water-mass density value ρ _w,

B, sampling are demarcated and are mixed the liquid density p _Vw,

The linear density ρ that c, radiation source 1 and receiver 2 by the vertical-horizontal conduit axis record _x, further pass through basis ${\mathrm{\ρ}}_{\mathrm{ow}}=\frac{d\left({\mathrm{\ρ}}_{x\_}{\mathrm{\ρ}}_g\right)t{\mathrm{\ρ}}_{g}h}{h}$ Calculate liquid level, d, record the long-pending V of oil, gas, waterline gonosome by volume-displacement 3 _xE, by linear density ρ _x, liquid level h, linear volume V _x, caliber d and gas, oil, water three parameter metric density ρ _g, ρ _o, ρ _wThe funtcional relationship of value: $M_o-\frac{h}{d}{V}_x{\mathrm{\ρ}}_g\frac{h{\mathrm{\ρ}}_w-d\left({\mathrm{\ρ}}_{x\_}{\mathrm{\ρ}}_g\right)-h{\mathrm{\ρ}}_g}{h({\mathrm{\ρ}}_w-{\mathrm{\ρ}}_o)}$ $V_g-V_k(1-\frac{({\mathrm{\ρ}}_x-{\mathrm{\ρ}}_g)h}{d({\mathrm{\ρ}}_x-{\mathrm{\ρ}}_g)+{\mathrm{\ρ}}_{g}h})$ $V_w=V_x-V_g-\frac{M_o}{{\mathrm{\ρ}}_o}$ Designed oil, gas, water mixed delivery dividing apparatus 4 record pure oil mass, the water yield and tolerance.

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