CN104637363A - Fracturing and acidizing simulating and training system and simulating method - Google Patents

Abstract

The invention discloses fracturing and acidizing simulating and training system and a simulating method. The system comprises a control system, a liquid storage tank model, a tank-combining pipe-converging model, a high/low-pressure pipe-converging model, a sand concentrator model, a wax ball pipe-converging model, a liquid nitrogen truck model, a surface active agent pump model and a fracturing well head, wherein the control system comprises a teacher console, a three-dimensional projection system, a fracturing truck remote console, a fracturing truck local console, a sand mixing truck remote console and a sand mixing truck local console; the three-dimensional projection system is connected with an image fusion machine; all the consoles are connected with a parameter computer through RS232 (recommend standard 232) communication interfaces. The fracturing and acidizing simulating and training system has the beneficial effects that a simulation practical training platform of fracturing and acidizing technology is built, so that a theoretical teaching requirement is met, simulation practical training operation of practice is also provided; a site scene is displayed in a big screen projection way, and high-simulation site sound effect is combined, so that a trainee is more familiar with site equipment, error operation is reduced, the training effect is improved, and the training cost and the maintenance cost are reduced.

Description

Fracture acidizing stimulating and training system and analogy method

Technical field

The present invention relates to a kind of fracture acidizing stimulating and training system and analogy method.

Background technology

Fracture acidizing is mainly used in the Oil/gas Well in the comparatively dark or hyposmosis district of extent of congestion, and acid filling pressure is higher than the fracture acidizing of oil (gas) layer parting pressure, and people's custom is referred to as acid fracturing.Acidifying hydraulic pressure is the increasing yield and injection measure that domestic and international oil field LIMESTONE RESERVOIR extensively adopts.Important completion means now are started to become.Well fracturing acidizing treatment relates to multiple appliance arrangement, and complicated operation is dangerous, and any link goes wrong all may affect operation quality, even causes the accident, for country and people bring great loss.Therefore, train operating personnel and be familiar with operation relevant knowledge and professional skill is particularly important.But nearly all fracture acidizing apparatus is all distributed in field, training can not be put into scene, iff relying on conventional classroom instruction or laboratory operation, lack visual understanding, training is difficult to get a desired effect.

Patent No. CN202018748U discloses a kind of novel fracture acidizing simulator, adopts the form such as control desk and animation, simulates the technological process of fracture acidizing intuitively, vividly, realistically.But the technological process of simulation is single, can operating personnel limited, the inadequate system of training operation is comprehensive, and therefore teaching efficiency can not reach comprehensive and efficient requirement.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, a kind of fracture acidizing stimulating and training system and analogy method are provided, build the simulation training platform of a fracture acidizing technology, adopt the forms such as multiple long-range, local control desk and animation, vividly, all kinds of training operations related in fracture acidizing process are simulated realistically, with large screen projection mode display scene scene, in conjunction with the on-the-spot audio of high emulation, student is allowed to have cognition on the spot in person, improve practical competence, reduce maloperation, enhancement training effect, reduce training and maintenance cost.

The object of the invention is to be achieved through the following technical solutions: a kind of fracture acidizing stimulating and training system, it comprises control system, fluid reservoir model, and tank manifold model, high-low pressure manifold model, sand concentrator model, wax bulb remittance model, liquid nitrogen car model, surfactant/pump model and fracture well head, described control system comprises teacher's control desk, ring curtain projection system, fracturing truck remote console, the local control desk of fracturing truck, truck-mounted blender remote console, the local control desk of truck-mounted blender, described teacher's control desk comprises Parameters Computer, main control computer, image computer, image co-registration machine, printer, Parameters Computer, main control computer, image computer is connected by LAN (Local Area Network), and printer is connected with main control computer, and image co-registration machine is connected with graphic computer, and ring curtain projection system is connected with image co-registration machine, fracturing truck remote console, the local control desk of fracturing truck, truck-mounted blender remote console is connected with Parameters Computer respectively by RS232 communication with the local control desk of truck-mounted blender,

The local control desk of described fracturing truck remote console, fracturing truck local control desk, truck-mounted blender remote console and truck-mounted blender includes PLC, STM8S controller, front ends operable input equipment and front end output display unit; Front ends operable input equipment comprises multiple switch, button, valve, and front end output display unit comprises pilot lamp, tensimeter and thermometer; Front ends operable input equipment is connected with PLC, front end output display unit is connected with STM8S controller, being provided with the state data acquisition module for gathering on off state, button value and valve opening in PLC, in STM8S controller, being provided with the output control module for controlling the display of pilot lamp, tensimeter and thermometer;

Described main control computer is provided with for according on off state, button value and valve opening data, is gone out the computing module of equipment Working state data, mobility status data in LED status, tensimeter data, thermometer data, virtual scene by calculated with mathematical model;

The on-the-spot outdoor scene and the virtual of equipment working condition described graphic processor is provided with for presenting simulation according to equipment Working state data in virtual scene presents module.

The ring curtain that described ring curtain projection system comprises microphone, stereophony, power amplifier, projector and matches with projector.

Adopt PPI bus communication between described PLC, between described STM8S controller, adopt CAN communication.

Described PLC, between STM8S controller and Parameters Computer by RS232 agreement exchange data.

Fracture acidizing analogy method, comprises the following steps:

S1, control system switch on power, and main control computer brings into operation primary control program, graphic computer display graphics program;

S2, main control computer send hardware initialization data by PLC as operating console;

S3, graphic computer send figure initialization data by PLC as operating console;

S4, read operation deck valve gated data and pushbutton data;

S5, judge that operation is whether correct, if so, then carry out S6, if not, system provides garbled voice prompting;

S6, main control computer are subject to valve data and pushbutton data, calculate flow, pressure, density according to mathematics physics model;

The parameters such as outflow, pressure, density are sent to graphic computer, the on-the-spot outdoor scene of graphics processing computer according to these data display simulations, the working condition of equipment by S7, main control computer;

The parameters such as outflow, pressure, density are returned to PLC by S8, main control computer, and PLC controls the result of calculation that hardware components display main control computer corresponding on each operator's console sends;

S9, judge that operation is whether correct, if so, then terminate program, if not, return S4.

Described mathematics physics model calculates and comprises following algorithm:

(1) calculating of fracturing liquid frictional resistance: in essence, falls resistance than the performance of different rheological properties in frictional resistance being exactly Newtonian fluid and non-Newtonian fluid;

The concept of resistance ratio is fallen:

$\mathrm{\σ}=\frac{{\left({\mathrm{\ΔP}}_f\right)}_p}{{\left(\mathrm{\Δ}{P}_f\right)}_0}$

In formula: (Δ P _f) ₀for the friction loss of clear water, MPa; (Δ Pf) _pfor of the fracturing fluid friction loss, MPa;

The friction loss of clear water can calculate with classical hydraulics Reynolds number and coefficient of friction resistance relation:

(ΔP _f) ₀＝1.385*10 ⁶*D ^-4.8*Q ^1.8*H

In formula: D is the internal diameter of pressure break oil pipe, mm; Q is construction fracturing liquid infusion discharge capacity, m ³/ min; H is tubing length, m;

Falling resistance is fracturing liquid mean flow rate v, thickener concentration C than σ _hPG, proppant concentration C _pfunction, be typically expressed as

δ＝f(v、C _HPG、C _p)

In conjunction with actual conditions, show that the calculating rule-of-thumb relation hindering ratio falls in following practicality and HPG fracturing liquid:

$\begin{array}{c}\ln \frac{1}{\mathrm{\δ}}=2.38-1.1525*{10}^{-4}*\frac{D^2}{Q}-0.2819*{10}^{-4}{C}_{\mathrm{HPG}}\frac{D^2}{Q}--0.1639\ln \frac{C_{\mathrm{HPG}}}{0.11983}-\\ 2.3372*{10}^{-4}*C_p{e}^{\left(\frac{0.11983}{C_{\mathrm{HPG}}}\right)}\end{array}$

In formula: C _pfor the concentration of propping agent, kg/m^3; C _hPGfor the concentration of viscosifying agent HPG, kg/m^3;

(2) spearhead frictional resistance calculates:

$\ln \frac{1}{\mathrm{\δ}}=2.049951-1.1525*{10}^{-4}\frac{D^2}{Q}-0.28194*{10}^{-4}{C}_{\mathrm{HPG}}\frac{D^2}{Q}-0.1639\ln \frac{C_{\mathrm{HPG}}}{0.11983}$

(3) sand-carrying agent frictional resistance calculates:

$\begin{array}{c}\ln \frac{1}{\mathrm{\δ}}=2.049951-1.1525*{10}^{-4}*\frac{D^2}{Q}-0.2819*{10}^{-4}{C}_{\mathrm{HPG}}\frac{D^2}{Q}--0.1639\ln \frac{C_{\mathrm{HPG}}}{0.11983}-3.015*\\ 10^{-4}*C_p{e}^{\left(\frac{0.11983}{C_{\mathrm{HPG}}}\right)}\end{array}$

(4) bottom-hole pressure method:

For the feature of pressing crack construction process, set up wellhead pressure conversion bottomhole wellbore pressure model:

P _wf＝P _wh+P _h-ΔP _wb-ΔP _perf-ΔP _near

In formula: P _wf, P _wh, P _hbe respectively as well pressure, wellhead pressure and fracturing liquid hydrostatic force, MPa; Δ P _wb, Δ P _perf, Δ P _nearbe respectively pit shaft frictional resistance, perf frictional resistance and nearly well bending friction, MPa;

Pit shaft frictional resistance:

$\begin{array}{c}\ln \frac{1}{\mathrm{\δ}}=2.38-\frac{D^2}{Q}*1.154*10^{-4}-\frac{G{D}^2}{Q}*2.838*{10}^{-5}-0.1639\ln \left(8.347G\right)-e^{\frac{0.1198}{G}}*\\ 2.336*{10}^{-4}P\end{array}$

In formula: G, P are respectively the mass concentration of HPG viscosifying agent and propping agent, kg/m^3; Q is for injecting discharge capacity, m^3/min; D is pipe aperture, mm;

Can be obtained by above formula and fall resistance ratio, then according to engineering fluid mechanics correlation theory, obtain pipeline clear water frictional resistance, and then obtain mulling liquid pipeline frictional resistance (i.e. pit shaft frictional resistance) in fracturing process;

Perf frictional resistance:

$\mathrm{\Δ}{P}_{\mathrm{perf}}=\frac{0.0002\mathrm{Q\ρ}}{{10}^6{n}^2{d}^4{c}^2}$

Wherein,

n＝DENh

$\mathrm{\ρ}=\frac{{\mathrm{\ρ}}_1+{\mathrm{\ρ}}_t{C}_c}{1+\frac{{\mathrm{\ρ}}_t{C}_c}{{\mathrm{\ρ}}_B}}$

In formula: ρ is fluid density, kg/m^3; N is eyelet number; D is eye diameter, m; C is eyelet coefficient of flow; DEN is Kong Mi, hole/m; H is the limited thickness of opening of construction interval, m; ρ ₁for base fluid density, kg/m^3; ρ _tfor proppant volume density, kg/m^3; ρ _sfor propping agent pseudodensity, kg/m^3; C _cfor sand ratio;

Nearly well bending friction:

ΔP _entry＝k _pQ ^α+k _nQ ^β＝k _zQ ^γ

In formula: Δ P _entryfor entry friction, MPa; k _p, k _n, k _zbe respectively the perforation coefficient of friction resistance, immediate vicinity of wellbore bending friction coefficient and the matching coefficient of friction resistance; α, beta, gamma is fitting coefficient.

The beneficial effect of technical solution of the present invention: fracture acidizing stimulating and training system builds the simulation training platform of a fracture acidizing technology, theory teaching requirement can be met, the simulation training operation put into practice and start can be provided again, with large screen projection mode display scene scene, in conjunction with the on-the-spot audio of high emulation, make student more familiar to field apparatus, improve practical competence and professional skill, reduce maloperation, enhancement training effect, reduce training and maintenance cost.The present invention can give training following items and impart knowledge to students: be connected acid fracturing surface pipeline real training; Acid fracturing surface pipeline pressure testing real training; Acid fracturing ground interview circulation real training; Acid fracturing tries compacted instruction; The different fracturing string of assembly; Acid fracturing truck operation real training; Truck-mounted blender operation real training; All kinds of instrument dismounting training of acid fracturing; Acid fracturing tank connects training; The analysis of acid fracturing failure; Acid fracturing instrument detects.

Accompanying drawing explanation

Fig. 1 is the structural representation of control system of the present invention;

Fig. 2 is software module flowchart of the present invention;

Embodiment

Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited to the following stated.

As shown in Figure 1, a kind of fracture acidizing stimulating and training system, it comprises control system, fluid reservoir model, and tank manifold model, high-low pressure manifold model, sand concentrator model, wax bulb remittance model, liquid nitrogen car model, surfactant/pump model and fracture well head, described control system comprises teacher's control desk, ring curtain projection system, fracturing truck remote console, the local control desk of fracturing truck, truck-mounted blender remote console, the local control desk of truck-mounted blender, described teacher's control desk comprises Parameters Computer, main control computer, image computer, image co-registration machine, printer, Parameters Computer, main control computer, image computer is connected by LAN (Local Area Network), printer is connected with main control computer, image co-registration machine is connected with graphic computer, ring curtain projection system is connected with image co-registration machine, fracturing truck remote console, the local control desk of fracturing truck, truck-mounted blender remote console is connected with Parameters Computer respectively by RS232 communication with the local control desk of truck-mounted blender,

The local control desk of described fracturing truck remote console, fracturing truck local control desk, truck-mounted blender remote console and truck-mounted blender includes PLC, STM8S controller, front ends operable input equipment and front end output display unit; Front ends operable input equipment comprises multiple switch, button, valve, and front end output display unit comprises pilot lamp, tensimeter and thermometer; Front ends operable input equipment is connected with PLC, front end output display unit is connected with STM8S controller, being provided with the state data acquisition module for gathering on off state, button value and valve opening in PLC, in STM8S controller, being provided with the output control module for controlling the display of pilot lamp, tensimeter and thermometer;

Described main control computer is provided with for according on off state, button value and valve opening data, is gone out the computing module of equipment Working state data, mobility status data in LED status, tensimeter data, thermometer data, virtual scene by calculated with mathematical model;

The on-the-spot outdoor scene and the virtual of equipment working condition described graphic processor is provided with for presenting simulation according to equipment Working state data in virtual scene presents module.

The ring curtain that described ring curtain projection system comprises microphone, stereophony, power amplifier, projector and matches with projector.

Adopt PPI bus communication between described PLC, between described STM8S controller, adopt CAN communication.

Described PLC, between STM8S controller and Parameters Computer by RS232 agreement exchange data.

As shown in Figure 2, fracture acidizing analogy method, comprises the following steps:

S1, control system switch on power, and main control computer brings into operation primary control program, graphic computer display graphics program;

S2, main control computer send hardware initialization data by PLC as operating console;

S3, graphic computer send figure initialization data by PLC as operating console;

S4, read operation deck valve gated data and pushbutton data;

S5, judge that operation is whether correct, if so, then carry out S6, if not, system provides garbled voice prompting;

S6, main control computer are subject to valve data and pushbutton data, calculate flow, pressure, density according to mathematics physics model;

The parameters such as outflow, pressure, density are sent to graphic computer, the on-the-spot outdoor scene of graphics processing computer according to these data display simulations, the working condition of equipment by S7, main control computer;

The parameters such as outflow, pressure, density are returned to PLC by S8, main control computer, and PLC controls the result of calculation that hardware components display main control computer corresponding on each operator's console sends;

S9, judge that operation is whether correct, if so, then terminate program, if not, return S4.

Described mathematics physics model calculates and comprises following algorithm:

(1) calculating of fracturing liquid frictional resistance: in essence, falls resistance than the performance of different rheological properties in frictional resistance being exactly Newtonian fluid and non-Newtonian fluid;

The concept of resistance ratio is fallen:

$\mathrm{\σ}=\frac{{\left({\mathrm{\ΔP}}_f\right)}_p}{{\left(\mathrm{\Δ}{P}_f\right)}_0}$

In formula: (Δ P _f) ₀for the friction loss of clear water, MPa; (Δ P _f) _pfor of the fracturing fluid friction loss, MPa; The friction loss of clear water can calculate with classical hydraulics Reynolds number and coefficient of friction resistance relation:

(ΔP _f) ₀＝1.385*10 ⁶*D ^-4.8*Q ^1.8*H

In formula: D is the internal diameter of pressure break oil pipe, mm; Q is construction fracturing liquid infusion discharge capacity, m ³/ min; H is tubing length, m; Falling resistance is fracturing liquid mean flow rate v, thickener concentration C than σ _hPG, proppant concentration C _pfunction, be typically expressed as

δ＝f(v、C _HPG、C _p)

In conjunction with actual conditions, show that the calculating rule-of-thumb relation hindering ratio falls in following practicality and HPG fracturing liquid:

$\begin{array}{c}\ln \frac{1}{\mathrm{\δ}}=2.38-1.1525*{10}^{-4}*\frac{D^2}{Q}-0.2819*{10}^{-4}{C}_{\mathrm{HPG}}\frac{D^2}{Q}--0.1639\ln \frac{C_{\mathrm{HPG}}}{0.11983}-\\ 2.3372*{10}^{-4}*C_p{e}^{\left(\frac{0.11983}{C_{\mathrm{HPG}}}\right)}\end{array}$

In formula: C _pfor the concentration of propping agent, kg/m^3; C _hPGfor the concentration of viscosifying agent HPG, kg/m^3;

(2) spearhead frictional resistance calculates:

$\ln \frac{1}{\mathrm{\δ}}=2.049951-1.1525*{10}^{-4}\frac{D^2}{Q}-0.28194*{10}^{-4}{C}_{\mathrm{HPG}}\frac{D^2}{Q}-0.1639\ln \frac{C_{\mathrm{HPG}}}{0.11983}$

(3) sand-carrying agent frictional resistance calculates:

$\begin{array}{c}\ln \frac{1}{\mathrm{\δ}}=2.049951-1.1525*{10}^{-4}*\frac{D^2}{Q}-0.2819*{10}^{-4}{C}_{\mathrm{HPG}}\frac{D^2}{Q}--0.1639\ln \frac{C_{\mathrm{HPG}}}{0.11983}-3.015*\\ 10^{-4}*C_p{e}^{\left(\frac{0.11983}{C_{\mathrm{HPG}}}\right)}\end{array}$

(4) bottom-hole pressure method:

For the feature of pressing crack construction process, set up wellhead pressure conversion bottomhole wellbore pressure model:

P _wf＝P _wh+P _h-ΔP _wb-ΔP _perf-ΔP _near

In formula: P _wf, P _wh, P _hbe respectively bottomhole wellbore pressure, wellhead pressure and fracturing liquid hydrostatic force, MPa, Δ P _wb, Δ P _perf, Δ P _nearbe respectively pit shaft frictional resistance, perf frictional resistance and nearly well bending friction, MPa;

Pit shaft frictional resistance:

$\begin{array}{c}\ln \frac{1}{\mathrm{\δ}}=2.38-\frac{D^2}{Q}*1.154*10^{-4}-\frac{G{D}^2}{Q}*2.838*{10}^{-5}-0.1639\ln \left(8.347G\right)-e^{\frac{0.1198}{G}}*\\ 2.336*{10}^{-4}P\end{array}$

In formula: G, P are respectively the mass concentration of HPG viscosifying agent and propping agent, kg/m^3; Q is for injecting discharge capacity, m^3/min; D is pipe aperture, mm;

Can be obtained by above formula and fall resistance ratio, then according to engineering fluid mechanics correlation theory, obtain pipeline clear water frictional resistance, and then obtain mulling liquid pipeline frictional resistance (i.e. pit shaft frictional resistance) in fracturing process;

Perf frictional resistance:

$\mathrm{\Δ}{P}_{\mathrm{perf}}=\frac{0.0002\mathrm{Q\ρ}}{{10}^6{n}^2{d}^4{c}^2}$

Wherein,

n＝DENh

$\mathrm{\ρ}=\frac{{\mathrm{\ρ}}_1+{\mathrm{\ρ}}_t{C}_c}{1+\frac{{\mathrm{\ρ}}_t{C}_c}{{\mathrm{\ρ}}_B}}$

In formula: ρ is fluid density, kg/m^3; N is eyelet number; D is eye diameter, m; C is eyelet coefficient of flow; DEN is Kong Mi, hole/m; H is the limited thickness of opening of construction interval, m; ρ ₁for base fluid density, kg/m^3; ρ _tfor proppant volume density, kg/m^3; ρ _sfor propping agent pseudodensity, kg/m^3; C _cfor sand ratio;

Nearly well bending friction:

ΔPentry＝k _pQ ^α+k _nQ ^β＝k _zQ ^γ

In formula: Δ P _entryfor entry friction, MPa; k _p, k _nk _zbe respectively the perforation coefficient of friction resistance, immediate vicinity of wellbore bending friction coefficient and the matching coefficient of friction resistance; α, beta, gamma is fitting coefficient.

The principle of work of technical solution of the present invention: control system switches on power, teacher's main control computer runs primary control program, control figure Computer display graphic package, PLC starts to the pilot lamp on operation model platform, tensimeter, thermometer sends data, valve opening and button state on circle collection table top simultaneously, PLC is connected with main control computer by serial ports, after main control computer receives valve and button state, the state of pilot lamp is gone out according to calculated with mathematical model, manometric data, the data of thermometer, the Working state data of equipment in virtual scene, mobility status data.

The result of calculation that the data back of the state of the pilot lamp calculated, manometric data, thermometer sends to the hardware components display main control computer that PLC, PLC control correspondence on each operator's console by main control computer.Main control computer simultaneously by the equipment Working state data in the virtual scene calculated, send to graphics processing computer, the on-the-spot outdoor scene of graphics processing computer according to these data display simulations, the working condition of equipment.

Claims (6)

1. a fracture acidizing stimulating and training system, is characterized in that: it comprises control system, fluid reservoir model, and tank manifold model, high-low pressure manifold model, sand concentrator model, wax bulb remittance model, liquid nitrogen car model, surfactant/pump model and fracture well head, described control system comprises teacher's control desk, ring curtain projection system, fracturing truck remote console, the local control desk of fracturing truck, truck-mounted blender remote console, the local control desk of truck-mounted blender, described teacher's control desk comprises Parameters Computer, main control computer, graphic computer, image co-registration machine, printer, Parameters Computer, main control computer, image computer is connected by LAN (Local Area Network), and printer is connected with main control computer, and image co-registration machine is connected with graphic computer, and ring curtain projection system is connected with image co-registration machine, fracturing truck remote console, the local control desk of fracturing truck, truck-mounted blender remote console is connected with Parameters Computer respectively by RS232 communication interface with the local control desk of truck-mounted blender,

The local control desk of described fracturing truck remote console, fracturing truck local control desk, truck-mounted blender remote console and truck-mounted blender includes PLC, STM8S controller, front ends operable input equipment and front end output display unit; Front ends operable input equipment comprises multiple switch, button, valve, and front end output display unit comprises pilot lamp, tensimeter and thermometer; Front ends operable input equipment is connected with PLC, front end output display unit is connected with STM8S controller, PLC is provided with the state data acquisition module for gathering on off state, button value and valve opening, is provided with the output control module for controlling the display of pilot lamp, tensimeter and thermometer in STM8S controller;

Described main control computer is provided with for according on off state, button value and valve opening data, is gone out the computing module of equipment Working state data, mobility status data in LED status, tensimeter data, thermometer data, virtual scene by calculated with mathematical model;

The on-the-spot outdoor scene and the virtual of equipment working condition described graphic processor is provided with for presenting simulation according to equipment Working state data in virtual scene presents module.

2. a kind of fracture acidizing stimulating and training system according to claim 1, is characterized in that: the ring curtain that described ring curtain projection system comprises microphone, stereophony, power amplifier, projector and matches with projector.

3. a kind of fracture acidizing stimulating and training system according to claim 1, is characterized in that: adopt PPI bus communication between described PLC, adopts CAN communication between described STM8S controller.

4. a kind of fracture acidizing stimulating and training system according to claim 3, is characterized in that: described PLC, between STM8S controller and Parameters Computer by RS232 agreement exchange data.

5. fracture acidizing analogy method, is characterized in that: comprise the following steps:

S1, control system switch on power, and main control computer brings into operation primary control program, graphic computer display graphics program;

S2, main control computer send hardware initialization data by PLC as operating console;

S3, graphic computer send figure initialization data by PLC as operating console;

S4, read operation deck valve gated data and pushbutton data;

S5, judge that operation is whether correct, if so, then carry out S6, if not, system provides garbled voice prompting;

S6, main control computer are subject to valve data and pushbutton data, calculate flow, pressure, density according to mathematics physics model;

The parameters such as outflow, pressure, density are sent to graphic computer, the on-the-spot outdoor scene of graphics processing computer according to these data display simulations, the working condition of equipment by S7, main control computer;

The parameters such as outflow, pressure, density are returned to PLC by S8, main control computer, and PLC controls the result of calculation that hardware components display main control computer corresponding on each operator's console sends;

S9, judge that operation is whether correct, if so, then EOP (end of program); If not, then S4 is returned.

6. fracture acidizing analogy method according to claim 5, is characterized in that: mathematics physics model calculates and comprises following algorithm:

(1) calculating of fracturing liquid frictional resistance: in essence, falls resistance than the performance of different rheological properties in frictional resistance being exactly Newtonian fluid and non-Newtonian fluid;

The concept of resistance ratio is fallen:

In formula: (Δ P _f) _ofor the friction loss of clear water, MPa; (Δ P _f) _pfor of the fracturing fluid friction loss, MPa;

The friction loss of clear water can calculate with classical hydraulics Reynolds number and coefficient of friction resistance relation:

(ΔP _f) _o＝1.385*10 ⁶*D ^-4.8*Q ^1.8*H

In formula: D is the internal diameter of pressure break oil pipe, mm; Q is construction fracturing liquid infusion discharge capacity, m ³/ min; H is tubing length, m;

Falling resistance is fracturing liquid mean flow rate v, thickener concentration C than σ _hPG, proppant concentration C _pfunction, be typically expressed as

δ＝f(v、C _HPG、C _P)

In conjunction with actual conditions, show that the calculating rule-of-thumb relation hindering ratio falls in following practicality and HPG fracturing liquid:

In formula: C _pfor the concentration of propping agent, kg/m^3; C _hPGfor the concentration of viscosifying agent HPG, kg/m^3;

(2) spearhead frictional resistance calculates:

(3) sand-carrying agent frictional resistance calculates:

(4) bottom-hole pressure method:

For the feature of pressing crack construction process, set up wellhead pressure conversion bottomhole wellbore pressure model:

P _wf＝P _wh+P _h-ΔP _wb-ΔP _perf-ΔP _near

In formula: P _wf, P _wh, P _hbe respectively bottomhole wellbore pressure, wellhead pressure and fracturing liquid hydrostatic force, MPa; Δ P _wb, Δ P _perf, Δ P _nearbe respectively pit shaft frictional resistance, perf frictional resistance and nearly well bending friction, MPa;

1. pit shaft frictional resistance

In formula: G, P are respectively the mass concentration of HPG viscosifying agent and propping agent, kg/m^3; Q is for injecting discharge capacity, m^3/min; D is pipe aperture, mm;

Can be obtained by above formula and fall resistance ratio, then according to engineering fluid mechanics correlation theory, obtain pipeline clear water frictional resistance, and then obtain mulling liquid pipeline frictional resistance in fracturing process, i.e. pit shaft frictional resistance;

2. perf frictional resistance

Wherein

n＝DENh

In formula: ρ is fluid density, kg/m^3; N is eyelet number; D is eye diameter, m; C is eyelet coefficient of flow; DEN is Kong Mi, hole/m; H is the limited thickness of opening of construction interval, m; ρ ₁for base fluid density, kg/m^3; ρ _tfor proppant volume density, kg/m^3; ρ _sfor propping agent pseudodensity, kg/m^3; C _cfor sand ratio;

3. nearly well bending friction

ΔP _entry＝k _pQ ^α+k _nQ ^β＝k _zQ ^γ

In formula: Δ P _entryfor entry friction, MPa; k _p, k _n, k _zbe respectively the perforation coefficient of friction resistance, immediate vicinity of wellbore bending friction coefficient and the matching coefficient of friction resistance; α, beta, gamma is fitting coefficient.