Intelligent diversion capacity measuring instrument

DLY120-200Intelligent diversion capacity measuring instrument

1、 The function of the instrument

Fracturing operation is one of the main methods for increasing production and transforming low-permeability oil reservoirs in oilfield production. The increase in production effect of hydraulic fracturing operations is closely related to the conductivity of supporting fractures, which depends on the width of the fractures and the permeability of the supporting agent after fracture closure. Therefore, only by selecting and controlling the quality of different sources of proppants before fracturing operations can the best construction design be ensured. The flow capacity measuring instrument is an instrument used to select and control the quality of different proppants before fracturing operations, and can also evaluate the damage caused by the working fluid (fracturing fluid) to the fracture flow capacity.

2、 Basic Principles of Instruments

The crack flow meter is based onDeveloped according to API standards. It can simulate downhole pressure and temperature under standard experimental conditions to evaluate the flow conductivity of fracture proppants for different pressure fluids, and thus compare the performance of various proppant fracturing fluids. The testing method is as follows:

1. Apply different closing pressures to the testing chamber containing proppant using a hydraulic press to make the proppant in a semi stable state.

2. Inject test fluid into the supporting agent layer, and measure the crack width, pressure difference, etc. under each closing pressure through various sensors and computers at regular intervals.

3. Use Darcy's formula to calculate the permeability and fracture conductivity of the proppant layer, and evaluate the damage caused by pressure fluid to the conductivity.

4. Repeat this process until all required closure pressures and flow rates are evaluated;

5. Heat the testing room to the reservoir temperature and then test the proppant layer.

3、 Instrument system process

This instrument consists of the following components:

1. Linear flow guide chamber (radial flow guide chamber) that meets API standards; Test area 64.5cm²,The upper and lower ends of the proppant can be equipped with rock molds and disassembly tools.

2. Hydraulic press and pressure compensation system;

3. Linear displacement sensor;

4. Experimental liquid displacement system, including displacement pump and storage container, etc;

5. Differential pressure gauge and pressure sensor;

6. Backpressure regulation system;

7. Balance;

8. Heating and temperature control system;

9. Vacuum system;

10. Automatic control system;

11. Data collection and processing system..

The process is shown in the figure (attached below):

4、 Master Technical indicators are required

1. Liquid flow rate range: 0.01～20mL/min

2. Test pressure: maximum 10MPa

3. Operating temperature: Room temperature~200℃； ±1℃

4. Closing pressure: 0-120MPa;

5. Proppant thickness: 0.25～1.27cm；

6. Liquid pressure difference: Δ P (0-10Kp)a）, accuracy0.25%F.S；

7. Gas core pre pressure: P₁（0－100Kpa）、 Post rock pressure: P₂（0-100Kpa)

8. Gas flowmeter range: 0-500ml/min 0-30000ml/min

9. Diversion capacity:0-1200µm²_·cm

10. Penetration rate: 0-3000 µ mm²

11. Displacement: ± 20mm, accuracy ±0.003㎜

12.Working fluids: oil, gas, water, fracturing fluid, etc.

5、 Main technical features

1. The instrument automatically collects parameters such as pressure difference, displacement, flow rate, temperature, etc., and can automatically process the data to calculate the flow capacity under different closure pressures.

After completing the three flow tests of a closed pressure, the instrument can automatically switch to the next closed pressure to continue the experiment.

3. Automatic compensation of closing pressure. If the closing pressure drops due to deformation of the supporting agent or other reasons, the pressure compensation system can automatically compensate and maintain the closing pressure within a certain range of variation.

4. Under closed pressure, three types of flow rates are automatically converted, and after one flow rate is tested, the instrument automatically switches to the next flow rate for testing.

5. Manual and automatic operation functions.

6. It can simulate geological conditions and use rock models instead of steel plates to evaluate the conductivity of proppants

6、 Overview of the various systems that make up the instrument

6.1 Non pulsating flow plunger pump

Model:NP－KX-1020

Flow regulation range:0.01～20mL/minWork pressure:20MPa、 Accuracy:<± 1%, working voltage: 220V± 10%, 50Hz ± 2Hz, power consumption: 75W.

Communication interface with microcomputer, the operation of the pump can be directly controlled by the microcomputer, and the test flow rate can be automatically changed according to the set program during the testing process, achieving automation of the testing process.

6.2 Pressure Damper

Used to absorb pressure fluctuations caused by pump pressure fluctuations. Improve the testing accuracy of pressure difference.

6.3 Preheater

In the experiment requiring heating, in order to ensure that the experiment is carried out at the required temperature, the injected fluid needs to be preheated to ensure that the injected fluid is at the same temperature as the guide chamber. The heating power of this preheater is500W， Temperature control range: room temperature to 180 ℃.

6.4 Diversion chamber

The diversion chamber used for the instrument shall be strictly in accordance withAPI standard specifies the production of linear flow guide chambers and the thickness of the supporting agent filling layer0.25～1.27cmadjustableTest area 64.5cm², maximum load capacity1200KN， The working temperature is 200 ℃, the maximum internal pressure is 10MPa, and the upper and lower pistons, metal plates, and flow chambers are all made of high-strength stainless steel materials, which have a certain degree of corrosion resistance and great pressure resistance, ensuring that no plastic deformation occurs under test pressure. The flow chamber filter screen is made of stainless steel metal powder pressed, with a thickness of3mmThe particle size of the retained particles is smaller than65µm.

6.5 Differential pressure sensor

selectDP1300-A-C-2-S₂Type differential pressure transmitter, its range10Kpa， precision0.2%F·S。 The transmitter is intended for use with liquids or gases.

output:4~20mADC、 Power supply: 24VDC

6.6 Vacuum System

The vacuum system is used to evacuate the gas in the diversion chamber and pipeline, ensuring that the test is carried out under the unidirectional flow of the test liquid and ensuring the stability of the test pressure.

This system consists of oneThe 2XZ-2 rotary vane vacuum pump consists of a vacuum buffer container. The buffer container is made of transparent organic glass, and when saturated water is evacuated, it can be continuously pumped until water appears in the buffer container.

6.7 balance

Choose imported productsBS4202S precision electronic balance.

The maximum range of this balance4200g, accuracy0.01gConnected to a computer with a standard interface number, it can timely collect the amount of discharged liquid and calculate the liquid flow rate.

6.8 Backpressure control system

Used to control the outlet pressure of the diversion chamber, the system mainly consists of a top loading back pressure control valve and a pressure regulating valve. When the outlet pressure of the diversion chamber reaches the top control pressure of the pressure relief valve, the pressure relief valve automatically opens to release pressure, ensuring a constant outlet pressure. The control pressure must be controlled by gas to ensure control accuracy, and the control pressure value is displayed by a pressure gauge.

6.9 hydraulic press

Maximum load:1000KN、 Maximum distance between pressure plates: 300mmPiston diameter:Φ185mmMaximum travel distance:50mmPower consumption 0.75KWPower supply:380Ac 50HzLoading speed:3.54MPa/min.

6.10 Pressure compensation system

It consists of a pressure compensation pump, a pressure transmitter, and a control circuit board. The pressure transmitter continuously measures the actual closing pressure value and compares it with the set closing value. When the closing pressure value is lower than the error standard, the control circuit will automatically start the compensation pump to compensate and maintain the stability of the closing pressure. Another function of the compensation pump is that when the closing pressure needs to rise to the upper stage closing pressure, the compensation pump will automatically increase the pressure and judge.

6.11 displacement meter

adoptGA-10 (5CB-10C) precision digital displacement gauge, which consists of a differential transmitter (LVDT) and an electrical measuring instrument. Electrical measuring instruments consist of electronic measuring circuits and digital panel meters.

Displacement measurement range:0～20mmLinearity<0.05%Resolution:0.003mm.

Sensors have strong anti-interference ability against electrostatic induction and electromagnetic fields.

6.1Gas permeability measurement and pressure regulation system

Used for regulating gas pressure during gas measurement and diversion.

6.13. Choose D07 gas mass flowmeter

Used for precise measurement of gas flow rate, this flowmeter has the advantages of not being inaccurate due to temperature or pressure fluctuations, good repeatability, high accuracy, and fast response time.

Repeatability± 0.2% F.S, accuracy: ± 1% F.S, range: 500mL/min, 3000mL/min

6.14 Pressure transmitter

For measuring the inlet pressure difference of the guide chamber in gas permeation measurement, selectDG1300 type, accuracy: 0.1% F.S, range: 100Kpa, output: 4-20mA, voltage: 24VDC.

6.15 Data Collection Control and Processing System

The system is equipped with a communication adapter cardPCI－8340 、 Communication adapter card MOSA C168/PCI, composed of computer, printer, control, acquisition and processing software.

※ Used for automatic collection:

1.Differential pressure at the inlet and outlet of the diversion chamber;

2. Liquid flow rate;

3. Left and right displacement of the diversion chamber;

4. Inlet and outlet temperatures of the diversion chamber;

5. Compensate for pump pressure;

6.gas flow rate

※ Used for automatic control

1. Automatic flow rate change of the parallel flow pump;

2. Automatic change of closing pressure;

3. Automatic compensation for closing pressure;

※ Used for data processing

1. Diversion capacity;

2. Liquid permeability

3. Draw the relationship curve between each collected parameter and time.

※ Software

Full Chinese interface, flexible operation, convenient and friendly. canWindowsRun under 2000/XP. The input and prompt dialog box has functions such as prompt, self check, alarm, error operation handling, process diagram, etc. Capable of inputting raw data and environmental parameters of proppants, calculating results with various collected parameters, and storing them in disk file format for a long time. Various data tables (including temperature, pressure, flow rate, displacement, permeability, and flow capacity) can be freely generated for test reports or corresponding curves. The relationship curves between different fluids and crack flow capacity under different closure pressures, pressure differentials, temperatures, flow rates, etc., as well as different fluids under different closure pressures, pressure differentials, temperatures, flow rates, etc