CN1323223C - Device for measuring multiphase fluid of water, sand and air in air well drilling and its method - Google Patents

Abstract

The present invention discloses a device and a method for measuring water, sand and air ejections in an air drilling well. The device comprises an air-liquid-solid separator which is connected to a pipeline of the water, sand and air ejections and a reverse U-shaped pipe, wherein the rising section of the reverse U-shaped pipe is provided with a first differential pressure transducer, the falling section of the reverse U-shaped pipe is provided with a second differential pressure transducer, and the reverse U-shaped pipe is connected with an outlet of the ejection pipeline through a Venturi pipe and a mixer which are arranged on the pipeline. The air-liquid-solid separator is orderly provided with a one-way valve, a pressure meter and a Venturi nozzle which are communicated through the pipeline and the mixer, and the pressure meter, the nozzle of the Venturi pipe, the venturi pipe, the first differential pressure transducer and the second differential pressure transducer are respectively connected with a computer. The nozzle of the Venturi pipe is used for measuring air flow, the air density is corrected by the pressure meter, and the pressure difference of both sides of the reverse U-shaped pipe is measured by the Venturi pipe to obtain the phase ratio of water to sand. The computer simultaneously makes a solution according to a plurality of items of fluid theories, and the volume or the weight flow of the water and the sand can be obtained.

Description

The water of heterogeneous fluid, sand, air measurement mechanism and method thereof in the air drilling

Technical field

The invention belongs to the measuring apparatus of Petroleum Production technical field, relate to a kind of flow-measuring method and device, the water of heterogeneous fluid, sand, air measurement mechanism and method thereof in particularly a kind of air drilling.

Background technology

With the drilling well of air cooling drill bit method is a new technology that is used for natural gas extraction, new method, and this new technology is compared with the mud cools drill bit, has bit speed height, advantage that cost is low.And a key technology using this new method is to the drilling well effluent--the flow of-gas, water, sand is measured, and monitoring is to monitor the geology state in the drilling process at any time.At present also not having effective ways to monitor the flow of gas, water and sand, can only be estimation, measuring and calculating qualitatively, does not also have accurate method to use.Up to the present, also not having both at home and abroad can this gas-liquid-solid three-phase flow of on-line measurement air water sand equipment.Use the method for gas/water/solid-state three-phase flow of sand gas-liquid and instantaneous delivery and the integrated flux that device can be understood gas in the drilling process, water, sand, extremely important meaning is arranged for gas drilling.

Summary of the invention

The objective of the invention is to, the measurement mechanism of a kind of on-line continuous measurement heterogeneous fluid Zhong Shui, sand, air mass flow is provided and provides measuring method.

To achieve these goals, the technical scheme that the present invention takes is: the water of heterogeneous fluid, sand, air measurement mechanism in a kind of air drilling, comprise the solution-air solid separator, it is characterized in that, one end of this solution-air solid separator is connected with the pipeline of heterogeneous fluid, the other end is connected with an inverted U pipe, and there is first differential pressure pickup ascent stage of inverted U pipe, and its descending branch is provided with second differential pressure pickup; Outlet with the effluent pipeline is connected the inverted U pipe with blender by the Venturi tube that is provided with on the pipeline;

Be provided with one-way cock, pressure gauge and Venturi nozzle on the solution-air solid separator successively, and be communicated with blender by pipeline;

Pressure gauge, Venturi tube nozzle, Venturi tube, first differential pressure pickup, second differential pressure pickup also are connected with computer respectively.

The measuring method of above-mentioned measurement mechanism is characterized in that, comprises the following steps:

1) heterogeneous fluid is introduced into the solution-air solid separator, gas and water, sand separation in the solution-air solid separator, gas entered blender after gas upwards flowed through gas unidirectional valve, pressure gauge and Venturi tube nozzle measurement gas flow, and by pressure gauge correction gas density, the gas unidirectional valve only allows gas to flow through, and anti-sealing, sand mixture flow out;

2) water, sand mixture through the ascent stage of inverted U pipe and the differential pressure pickup of descending branch setting, by the pressure differential of these inverted U pipe both sides of Venturi measuring, obtain the phase ratio of water, sand then by the inverted U pipe;

3) computer can obtain the volume or weight flow of water and sand according to the theoretical simultaneous solution of heterogeneous fluid.

The water of heterogeneous fluid, sand, air measurement mechanism and method thereof have solved the difficult problem of pneumatic drill WIH, sand, air effluent flow measurement in the air drilling of the present invention, the certainty of measurement height, data are reliable, and whole measuring process can on-line measurement by computer control.

Description of drawings

Accompanying drawing 1 is a structure principle chart of the present invention.

The present invention is further illustrated below in conjunction with accompanying drawing

The specific embodiment

Referring to accompanying drawing, the measurement mechanism of the water of heterogeneous fluid, sand, air in the air drilling of the present invention, comprise solution-air solid separator 1, one end of this solution-air solid separator 1 is connected with the pipeline of heterogeneous fluid, the other end is connected with an inverted U pipe 4, there is first differential pressure pickup 9 ascent stage of inverted U pipe 4, and its descending branch is provided with second differential pressure pickup 10; Outlet with the effluent pipeline is connected inverted U pipe 4 with blender 6 by the Venturi tube 5 that is provided with on the pipeline;

Be provided with one-way cock 2, pressure gauge 8 and Venturi nozzle 3 on the solution-air solid separator 1 successively, and be communicated with blender 6 by pipeline;

Pressure gauge 8, Venturi nozzle 3, Venturi tube 5, first differential pressure pickup 9, second differential pressure pickup 10 also are connected with computer 7 respectively.

Heterogeneous fluid is introduced into the efficient solution-air solid separator 1 of a cramped construction, and gas and water sand separation gas are upwards flowed through gas unidirectional valve 2, and 2 on valve allows gas to flow through, and anti-sealing sand mixture flows out.Gas is with single-phase flow meter Venturi nozzle 3 measurement gas flows.Pressure gauge 8 is used for revising gas density.

$Q_g=C\·A\·\sqrt{\frac{\mathrm{\Δ\ρ}}{{\mathrm{\ρ}}_g}}---\left(1\right)$

In the formula, C is a discharge coefficient, Q _tFor gas density under the operating mode, revise by pressure p, A is the Venturi nozzle throat area;

Inverted U pipe 4 is used to measure water sand mixture density, when water, sand mixture flow through ascent stage of inverted U pipe (4), measures pressure reduction ρ at two first differential pressure pickups 9 of surveying vertical tube place's ascent stages ₁, second differential pressure pickup 10 of descending branch measures pressure reduction ρ ₂, this pressure reduction is mixture heavy position pressure reduction and friction pressure reduction sum.Its formula is as follows:

Δρ ₁＝ρ _f+Δρ _mgh?(2)

Δ ₂＝Δρ _f-Δρ _mgh?(3)

In the formula, ρ is a water sand mixture density, and h is the differential pressure measurement height, ρ _fBe frictional resistance pressure reduction, ρ _■Be water sand mixture density;

Can obtain by formula (2), (3):

Δρ _m＝(Δρ ₁-Δρ ₂)/2gh?(4)

In addition, Δ ρ _m=k _w* ρ _s+ k _w* ρ _w(5)

In the formula, Ks, Kw are the phase ratio of sand, water, ρ _S,,ρ _sDensity for sand, water.

Because:

k _s+k _w＝1?(6)

Can obtain the phase ratio k of water, sand by formula (5), (6) _w, k _s

The water sand mixture is measured the long-pending flow of water sand body with Venturi tube 5:

$Q_t=C\×S\×\sqrt{\frac{\mathrm{\Δ\ρ}}{{\mathrm{\Δ\ρ}}_m}}---\left(7\right)$

In the formula: Δ ρ is the pressure reduction of differential pressure pickup 9 and differential pressure pickup 10, and C is a discharge coefficient, and S is the throat area of Venturi tube.

Can obtain the volume or weight flow of water and sand by mixture density and water sand mixture volume flow:

Q _w＝k _w×Q _t?(8)

Q _w＝k _s×Q _t?(9)

Whole measuring process is by computer 7 controls and processing, all automations.

Claims (2)

1. water, sand, the air measurement mechanism of heterogeneous fluid in the air drilling, comprise solution-air solid separator (1), it is characterized in that, one end of this solution-air solid separator (1) is connected with the pipeline of water, sand, air effluent, the other end is connected with an inverted U pipe (4), there is first differential pressure pickup (9) ascent stage of inverted U pipe (4), and its descending branch is provided with second differential pressure pickup (10); Inverted U pipe (4) is connected with the outlet of effluent pipeline with blender (6) by the Venturi tube (5) that is provided with on the pipeline;

Be provided with one-way cock (2), pressure gauge (8) and Venturi tube nozzle (3) on the solution-air solid separator (1) successively, and be communicated with blender (6) by pipeline;

Pressure gauge (8), Venturi tube nozzle (3), Venturi tube (5), first differential pressure pickup (9), second differential pressure pickup (10) also are connected with computer (7) respectively.

2. water, sand, the air measuring method of heterogeneous fluid in the air drilling is characterized in that, this method adopts the described device of claim 1, and its measuring method comprises the following steps:

1) heterogeneous fluid is introduced into the solution-air solid separator, gas and water, sand separation in the solution-air solid separator, gas entered blender after gas upwards flowed through gas unidirectional valve, pressure gauge and Venturi tube nozzle measurement gas flow, and by pressure gauge correction gas density, the gas unidirectional valve only allows gas to flow through, and anti-sealing, sand mixture flow out;

2) water, sand mixture through the ascent stage of inverted U pipe and the differential pressure pickup of descending branch setting, by the pressure differential of these inverted U pipe both sides of Venturi measuring, obtain the phase ratio of water, sand then by the inverted U pipe;

3) computer can obtain the volume or weight flow of water and sand according to the theoretical simultaneous solution of heterogeneous fluid.