CN108956413A - Temporary plugging strength performance evaluation method of temporary plugging agent in fracture for oil field fracturing - Google Patents
Temporary plugging strength performance evaluation method of temporary plugging agent in fracture for oil field fracturing Download PDFInfo
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- 238000011156 evaluation Methods 0.000 title claims abstract description 6
- 238000012360 testing method Methods 0.000 claims abstract description 73
- 238000010276 construction Methods 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 58
- 239000003795 chemical substances by application Substances 0.000 claims description 52
- 239000007788 liquid Substances 0.000 claims description 31
- 238000002474 experimental method Methods 0.000 claims description 28
- 239000012530 fluid Substances 0.000 claims description 22
- 230000035699 permeability Effects 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 7
- 230000000994 depressogenic effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 10
- 238000007796 conventional method Methods 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011017 operating method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000013139 quantization Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention relates to the technical field of oil extraction engineering, in particular to a temporary plugging strength performance evaluation method of an in-fracture temporary plugging agent for oilfield fracturing. The method mainly solves the problem that the temporary plugging strength performance of the temporary plugging agent in the crack for oilfield fracturing cannot be systematically, effectively, quantitatively and accurately evaluated by the conventional method. According to basic data of fracturing construction, the temporary plugging of the temporary plugging agent in a fracturing fracture is simulated by adopting a laboratory flow conductivity testing device, and test parameters and an evaluation method corresponding to the temporary plugging strength of the temporary plugging agent in the fracture are provided. The method has the advantages of accurately, objectively and effectively evaluating the temporary plugging strength performance of the temporary plugging agent in the fracture for oil field fracturing.
Description
Technical field
The present invention relates to technical field of oil production engineering, and in particular to a kind of oil field fracturing stitches the temporary stifled intensity of interior diverting agent
Method of evaluating performance.
Background technique
Oil field straight well, horizontal well temporarily block up turnaround fracture, branch stitches in fracturing process, need to realize temporary stall using diverting agent
To, branch's joint stabilizing process measure effect.But current conventional method is to test the anamorphic stretching ability of diverting agent, or clamp using rock core
The closure pressure of device easily-testing diverting agent does not consider that diverting agent is placed into reality in artificial support crack in constructing at the scene
Border situation, the performance of test diverting agent that can not be accurate and effective in pressing crack construction, it is even more impossible to system testing, quantitatively evaluating are temporary
Temporary stifled strength character of the blocking agent in pressure break supporting crack, leads to not the preferred diverting agent type of specific aim.
Summary of the invention
It is an object of the invention to solve the problems, such as background technique, provide can system, effectively, it is quantization, accurate
Evaluating oilfield pressure break stitch in diverting agent temporarily stifled strength character method.
The present invention reaches by following technical solution: a kind of oil field fracturing stitch in the temporary strength character of blocking up of diverting agent comment
Valence method, comprising the following steps:
Step 1: experiment parameter is arranged using laboratory flow conductivity test device；It is specific as follows:
(1) predetermined experimental temperature: temperature value when using fractured well reservoir temperature as displacement；
(2) predetermined clossing pressure: fractured well reservoir clossing pressure is used；
(3) displacement liquid: the base fluid of used fracturing fluid when using fractured well pumping diverting agent；
(4) displacement flowQ: flow 1mL/min is used, is converted as 0.0167cm3/s；
(5) predetermined sanding concentration: according to the reservoir underlying parameter and construction parameter of site operation well, using fracture simulation software
Meyer or StimPlan inverting fracture parameters obtain the sanding concentration of man-made fracture；
Step 2: supporting crack flow conductivity is tested；It is specific as follows:
(1) vernier caliper measurement diversion chamber inner width is usedbLength between (unit cm) and diversion chamber's pressure tapL(unit cm),
With the viscosity of displacement liquid under the predetermined experimental temperature of rheometer measurementμ(unit mPa ﹒ s)；
(2) experiment test is loaded into the case where not filling proppant completion with diversion chamber, moves to experiment test platform, water conservancy diversion
Room is horizontal positioned, uniform load stress, loads displacement sensor at test platform, opens hydraulic pressurization machine and loads closure stress
To 1.0MPa, each position is fitted closely, and displacement meter test panel data are returned to zero, with vernier caliper measurement first time quadrangle height
Degree；
(3) hydraulic press is loaded into closure stress to predetermined clossing pressure, record displacement counts, and utilizes vernier caliper measurement second
Secondary quadrangle height subtracts first time quadrangle height, obtains diversion chamber's deflection under the conditions of predetermined clossing pressure, is averaged note
Forh 1 (unit cm)；
(4) after pressure release, diversion chamber is carried out plus sand is to scheduled sanding concentration, and records original sand thickness with vernier caliperh 2
Diversion chamber is moved to experiment test platform by (unit cm), is forced into 1.0MPa, is loaded displacement sensor and is returned to zero, third
Secondary record quadrangle height；
(5) differential pressure pickup, the inlet/outlet pipeline for connecting diversion chamber, guarantee that each valve is in close state, and open displacement pump pair
Diversion chamber builds the pressure, and displacement pumpage is controlled in 30mL/min, and diversion chamber builds the pressure to 2.0MPa, during which whether checks each pipeline
There is the phenomenon of leakage, if leakage situation occur stops experiment and the diversion chamber that reloads up to no leakage situation immediately；
(6) it opens vacuum pump to evacuate pipeline, evacuated time is greater than 30min, opens displacement pump thereafter, makes crack and pipeline
Saturation testing fluid；
(7) flow conductivity of applied voltage test proppant step by step, it is to be added when being depressed into predetermined clossing pressure, with vernier caliper record the 4th
Secondary quadrangle height and displacement count, and subtract third time quadrangle height, obtain the total deformation under predetermined clossing pressureh 3 (unit
Cm), the thickness of the proppant in diversion chamber under predetermined clossing pressure is calculatedh z (unit cm), formula are as follows:
h z =h 1 +h 2 -h 3
Calculate diversion chamber's overflow section product under predetermined clossing pressureA(unit cm2),A=b*h z ；
(8) flow conductivity test program is opened, typing is carried out to the parameters of this experiment, hereafter switches to experiment testing window
Mouthful, start to test；
(9) the test flow for adjusting constant-flux pump to setting, records inlet average pressure in 30minP 1, liquid outlet average pressureP 2, calculate inlet and liquid outlet and be averaged pressure difference△P(unit kPa)；Formula is as follows:
(10) after the completion of testing, constant-flux pump is closed, opens the gate gurgle valve of hydraulic press, oil pressure is unloaded, dismantles the pipeline of diversion chamber, take
Diversion chamber and the indoor proppant of water conservancy diversion out；
Step 3: calculating the original permeability under predetermined clossing pressure and predetermined sanding concentration conditionsk；Formula is as follows:
In formula:k- original permeability, μm2；
μThe viscosity of displacement liquid, mPa ﹒ s under-predetermined experimental temperature；
Q- displacement flow, cm3/s；
LLength between-diversion chamber pressure tap, cm；
A- diversion chamber overflow section product, cm2；
△P- inlet and liquid outlet are averaged pressure difference, kPa；
Step 4: diverting agent temporarily blocks up strength character test；It is specific as follows:
(1) diverting agent and proppant are inserted in diversion chamber jointly, diverting agent is laid in the middle part of diversion trench, the selection of proppant dosage
Depending on the predetermined sanding concentration of required measurement, the diversion chamber after the completion of loading is moved into experiment test platform, diversion chamber's water
Placing flat；
(2) pressure sensor, the inlet/outlet pipeline of diversion chamber are connected, each valve is in close state.Displacement pump is opened to water conservancy diversion
Room builds the pressure, and displacement pumpage is controlled in 30mL/min, and diversion chamber builds the pressure to 2MPa, during which checks whether each pipeline leaks
Liquid phenomenon, if leakage situation occur should stop testing and reloading diversion chamber immediately；
(3) it opens vacuum pump to evacuate pipeline, evacuated time is greater than 30min, opens displacement pump, is saturated crack and pipeline
Test fluid；
(4) it opens hydraulic pressurization machine and closure stress is loaded to diversion chamber, stop after closure stress rises to predetermined clossing pressure
Pressurization, voltage stabling control are greater than 30min；
(5) preheater and heater, temperature are opened and are set as reservoir temperature, with flow 1mL/min forward direction displacement liquid, observe into
Mouth end pressure variation；
(6) diverting agent breakthrough pressure is tested by the way of pressurizeing step by step, pressure increases step by step according to 15%, pressure stabilizing test
10min continues to be pressurized if not breaking through, until there is continuous liquid outflow in outlet end, illustrates that diverting agent has been broken, records this
When maximum pressure be diverting agent breakthrough pressureP, the as temporary stifled intensity of diverting agent；
(7) after diverting agent breakthrough, continue positive displacement liquid, the permeability after measurement is broken through in 30mink 1 ；
(8) after the completion of testing, constant-flux pump is closed, opens the gate gurgle valve of hydraulic press, oil pressure is unloaded, dismantles the pipeline of diversion chamber, take
Diversion chamber and the indoor proppant of water conservancy diversion out；
Step 5: calculating temporarily stifled rate；Formula is as follows:
In formula:z- temporarily block up rate, %；
k- original permeability, μm2；
k 1 - rear permeability is temporarily blocked up, μm2。
Compared with the prior art the present invention has the following beneficial effects:
The present invention can system, effectively, quantization, accurately evaluation stitch in diverting agent in fracturing fracture it is temporary block up strength character,
To instruct preferred diverting agent, individual well optimization design and site operation.Controllability is strong, easy to operate simple, safe and effective.
Detailed description of the invention: Fig. 1 is YP1-P4 well fracture pattern diagrammatic cross-section in the embodiment of the present invention 1；Fig. 2 is of the invention real
It applies and lays quartz sand in example 1 in flow conductivity test device；Fig. 3 is DCF-1 breakthrough pressure test result in the embodiment of the present invention；
Fig. 4 be in the embodiment of the present invention DCF-1 break through after pressure and permeability test result.
Specific embodiment: the invention will be further described with reference to the accompanying drawings and embodiments: step 1: using real
Room flow conductivity test device is tested, experiment parameter is set:
(1) predetermined experimental temperature: the reservoir temperature range that YP1-P4 well is determined according to YP1 block geothermal gradient is 78 DEG C -89 DEG C,
In view of diverting agent with fracturing fluid injects target zone together in pressing crack construction, due to the heat dissipation and and crack rock of fracturing fluid
Between the modes such as heat exchange, can all cause pit shaft and crack to generate cooling phenomenon, therefore the preferably 60 °C predetermined realities as displacement
Test temperature value；
(2) predetermined clossing pressure: due to diverting agent construct at the scene in be placed into man-made fracture, by external clossing pressure
Extruding, indoors experiment test in, should be taken into account influence of the clossing pressure to diverting agent, according to Daqing oil field site operation survey
Pressure testing cracking, which is released, determines that predetermined clossing pressure is 25.9MPa；
(3) displacement liquid: the base fluid of used fracturing fluid when using fractured well pumping diverting agent；
(4) displacement flowQ: during diverting agent is constructed at the scene, as prepad fluid or load fluid are added into formation fracture together,
Since the device condition of laboratory experiment limits, performance can not be temporarily blocked up by theory of similarity construction simulation discharge capacity, therefore to diverting agent
The selection universal flow 1mL/min of flow, is converted as 0.0167cm in test3/s；
(5) predetermined sanding concentration: the closure in order to really simulate diverting agent in man-made fracture needs to obtain and really manually split
Identical sanding concentration is stitched, using the reservoir underlying parameter and construction parameter of site operation JingYP1-P4Jing, using Meyer software
Inverting fracture parameters, inversion result are shown in Table 1；
From analog result as can be seen that the sanding concentration range in crack is between 1.76kg/m2-4.5kg/m2Between, it is contemplated that it is real
Under the conditions of testing, there are risks of failure for low sanding concentration, therefore high sanding sand concentration is selected to be tested, this experimental selection is predetermined
Sanding concentration is 4.5kg/m2, to guarantee that temporarily stifled strength test is further while meeting true simulation man-made fracture and blocking
Improve experiment success rate；
Step 2: the test of supporting crack flow conductivity obtains original permeability, specific experiment operating procedure is as follows:
(1) vernier caliper measurement diversion chamber inner width is usedbThe length between diversion chamber's pressure tapLRespectively 2cm and 10cm is used
The viscosity of displacement liquid under the predetermined experimental temperature of rheometer measurementμFor 22mPa ﹒ s；
(2) experiment test is loaded into the case where not filling proppant completion with diversion chamber, moves to experiment test platform, guaranteed
Diversion chamber is horizontal positioned, to ensure the uniform load of stress, loads displacement sensor at test platform, opens hydraulic pressurization machine
Closure stress is loaded to 1MPa, guarantees that each position fits closely, displacement meter test panel data is returned to zero, vernier caliper measurement is used
Quadrangle height；
(3) hydraulic press is loaded into closure stress to predetermined clossing pressure 25.9MPa, record displacement counts, and utilizes vernier caliper
Quadrangle height is measured, diversion chamber's deflection under the conditions of predetermined clossing pressure is obtained, is averaged and is denoted ash 1 For 0.12cm；
(4) after pressure release, diversion chamber is carried out plus sand is to scheduled sanding concentration, and records original sand thickness with vernier caliperh 2 For
Diversion chamber is moved to experiment test platform by 0.85cm, is forced into 1MPa, is loaded displacement sensor and is returned to zero, records quadrangle
Highly；
(5) the corresponding differential pressure pickup of connection diversion chamber, inlet/outlet pipeline, guarantee that each valve is in close state, open displacement
Pump builds the pressure to diversion chamber, and displacement pumpage is controlled in 30mL/min, and diversion chamber builds the pressure to 2MPa, during which checks that each pipeline is
It is no the phenomenon of leakage occur, if leakage situation occur should stop testing and reloading diversion chamber immediately；
(6) it after ensuring that each pipeline sealing is intact, opens vacuum pump and pipeline is evacuated, evacuated time 45min is opened thereafter
Displacement pump makes crack and pipeline saturation testing fluid (test fluid is using guanidine matrix liquid)；
(7) it opens hydraulic pressurization machine and closure stress is loaded to diversion chamber, it is to be added when being depressed into predetermined clossing pressure 25.9MPa, with trip
Mark slide calliper rule record quadrangle height and displacement count, and obtain the total deformation under predetermined clossing pressureh 3 For 0.662cm, to obtain
Obtained the thickness of the proppant in diversion chamber under the conditions of predetermined clossing pressureh z 。h z =h 2 -h 3 +h 1 =0.308cm；
Calculate diversion chamber's overflow section product under predetermined clossing pressureA=b*h z =0.616cm2；
(8) flow conductivity test program is opened, typing is carried out to the parameters of this experiment, hereafter switches to experiment testing window
Mouthful, start to test；
(9) the test flow for adjusting constant-flux pump to setting, records inlet average pressure in 30minP 1For 10.546kPa, liquid out
Mouth average pressureP 2For 6.652kPa, calculates inlet and liquid outlet is averaged pressure difference△PFor 3.894kP；Formula is as follows:
(10) after the completion of testing, constant-flux pump is closed, opens the gate gurgle valve of hydraulic press, oil pressure is unloaded, dismantles the pipeline of diversion chamber, take
Diversion chamber and the indoor proppant of water conservancy diversion out；
Step 3: calculating the original permeability under predetermined clossing pressure and predetermined sanding concentration conditionsk；Formula is as follows:
In formula:k- original permeability, μm2；
μThe viscosity 22 of displacement liquid, mPa ﹒ s under-predetermined experimental temperature；
Q- displacement flow 0.0167, cm3/s；
LLength 10, cm between-diversion chamber pressure tap；
A- diversion chamber overflow section product 0.616, cm2；
△P- inlet and liquid outlet are averaged pressure difference 3.894, kPa；
Calculating in clossing pressure value is 25.9MPa, sanding concentration 4.5kg/m2Under the conditions of proppant original permeabilitykIt is 153166
×10-3μm2；
Step 4: diverting agent temporarily blocks up strength character test；
In the original permeability for obtaining proppantkAfterwards, start the temporary stifled performance test experiment of diverting agent DCF-1, specific experiment
Operating procedure is as follows:
(1) the quartz sand proppant of diverting agent DCF-1 and pressure break is inserted in diversion chamber jointly, in order to avoid the circle of diversion trench
Arc end cannot be laid on end to resulting influence, diverting agent, it is desirable that diverting agent is laid in the middle part of diversion trench, and proppant is used
Amount is depending on predetermined sanding concentration.Diversion chamber after the completion of loading is moved into experiment test platform, guarantees that diversion chamber's level is put
It sets, to ensure the crack uniform load of stress pair；
(2) the corresponding pressure sensor of connection diversion chamber, inlet/outlet pipeline, guarantee that each valve is in close state, open displacement
Pump builds the pressure to diversion chamber, and displacement pumpage is controlled in 30mL/min, and diversion chamber builds the pressure to 2MPa, during which checks that each pipeline is
It is no the phenomenon of leakage occur, if leakage situation occur should stop testing and reloading diversion chamber immediately；
(3) it after ensuring that each pipeline sealing is intact, opens vacuum pump and pipeline is evacuated, evacuated time should be greater than 30min,
Displacement pump is opened afterwards, makes crack and pipeline saturation testing fluid；
(4) it opens hydraulic pressurization machine and closure stress is loaded to diversion chamber, when closure stress rises to predetermined clossing pressure 25.9MPa
Stop pressurization afterwards, guarantees that voltage stabling control is greater than 30min；
(5) it opens preheater and heater, temperature is set in 60 °C, fluid is tested with 1mL/min flow forward direction displacement simulation, is seen
Examine inlet pressure change；
(6) diverting agent DCF-1 breakthrough pressure is tested by the way of pressurizeing step by step, uses the method for applied voltage test step by step with 1ml/
Min flow displacement diverting agent, tests the breakthrough pressure of diverting agent, and due to the temporary stifled effect of diverting agent, diversion trench liquid outlet end does not have
There is fluid outflow, liquid outlet end has fluid outflow when pressure reaches 35MPa, illustrates that diverting agent has been broken, therefore temporarily stifled
The breakthrough pressure of agent DCF-1P(temporarily blocking up intensity) is 35MPa；
(7) after diverting agent breakthrough, continue positive displacement and test fluid, liquid outlet fluid flow starts slowly to restore, feed liquor
Mouth pressure value has different degrees of decline.The flow and pressure change for recording inlet and liquid outlet in 30min, according to permeability
Permeability after the determining breakthrough of calculation formula in 30mink 1 , at this timek 1 It is 0.53 × 10-3μm2, after diverting agent is broken, pressure is total
Stable tendency is presented in body, and resume permeability is unobvious；
(8) after the completion of testing, constant-flux pump is closed, opens the gate gurgle valve of hydraulic press, oil pressure is unloaded, dismantles the pipeline of diversion chamber, take
Diversion chamber and the indoor proppant of water conservancy diversion out；
Step 5: calculating temporarily stifled rate.Formula is as follows:
In formula:z- temporarily block up rate, %；
k- original permeability 153166 × 10-3, μm2；
k 1 - temporarily block up rear permeability 0.53 × 10-3, μm2；
It calculates diverting agent DCF-1 and temporarily blocks up ratezIt is 99%.
Table 1 is embodiment YP1-P4 well fracture parameters inversion result
Claims (1)
1. the temporary stifled strength character evaluation method that a kind of oil field fracturing stitches interior diverting agent, it is characterised in that: the following steps are included:
Step 1: experiment parameter is arranged using laboratory flow conductivity test device；It is specific as follows:
(1) predetermined experimental temperature: temperature value when using fractured well reservoir temperature as displacement；
(2) predetermined clossing pressure: fractured well reservoir clossing pressure is used；
(3) displacement liquid: the base fluid of used fracturing fluid when using fractured well pumping diverting agent；
(4) displacement flowQ: flow 1mL/min is used, is converted as 0.0167cm3/s；
(5) predetermined sanding concentration: according to the reservoir underlying parameter and construction parameter of site operation well, using fracture simulation software
Meyer or StimPlan inverting fracture parameters obtain the sanding concentration of man-made fracture；
Step 2: supporting crack flow conductivity is tested；It is specific as follows:
(1) vernier caliper measurement diversion chamber inner width is usedbLength between (unit cm) and diversion chamber's pressure tapL(unit cm),
With the viscosity of displacement liquid under the predetermined experimental temperature of rheometer measurementμ(unit mPa ﹒ s)；
(2) experiment test is loaded into the case where not filling proppant completion with diversion chamber, moves to experiment test platform, water conservancy diversion
Room is horizontal positioned, uniform load stress, loads displacement sensor at test platform, opens hydraulic pressurization machine and loads closure stress
To 1.0MPa, each position is fitted closely, and displacement meter test panel data are returned to zero, with vernier caliper measurement first time quadrangle height
Degree；
(3) hydraulic press is loaded into closure stress to predetermined clossing pressure, record displacement counts, and utilizes vernier caliper measurement second
Secondary quadrangle height subtracts first time quadrangle height, obtains diversion chamber's deflection under the conditions of predetermined clossing pressure, is averaged note
Forh 1 (unit cm)；
(4) after pressure release, diversion chamber is carried out plus sand is to scheduled sanding concentration, and records original sand thickness with vernier caliperh 2 It is (single
Position cm), diversion chamber is moved into experiment test platform, is forced into 1.0MPa, displacement sensor is loaded and returns to zero, third time is remembered
Record quadrangle height；
(5) differential pressure pickup, the inlet/outlet pipeline for connecting diversion chamber, guarantee that each valve is in close state, and open displacement pump pair
Diversion chamber builds the pressure, and displacement pumpage is controlled in 30mL/min, and diversion chamber builds the pressure to 2.0MPa, during which whether checks each pipeline
There is the phenomenon of leakage, if leakage situation occur stops experiment and the diversion chamber that reloads up to no leakage situation immediately；
(6) it opens vacuum pump to evacuate pipeline, evacuated time is greater than 30min, opens displacement pump thereafter, makes crack and pipeline
Saturation testing fluid；
(7) flow conductivity of applied voltage test proppant step by step, it is to be added when being depressed into predetermined clossing pressure, with vernier caliper record the 4th
Secondary quadrangle height and displacement count, and subtract third time quadrangle height, obtain the total deformation under predetermined clossing pressureh 3 (unit
Cm), the thickness of the proppant in diversion chamber under predetermined clossing pressure is calculatedh z (unit cm), formula are as follows:
h z =h 1 +h 2 -h 3
Calculate diversion chamber's overflow section product under predetermined clossing pressureA(unit cm2),A=b*h z ；
Flow conductivity test program is opened, typing is carried out to the parameters of this experiment, hereafter switches to experiment test window,
Start to test；
(9) the test flow for adjusting constant-flux pump to setting, records inlet average pressure in 30minP 1, liquid outlet average pressureP 2, calculate inlet and liquid outlet and be averaged pressure difference△P(unit kPa)；Formula is as follows:
(10) after the completion of testing, constant-flux pump is closed, opens the gate gurgle valve of hydraulic press, oil pressure is unloaded, dismantles the pipeline of diversion chamber, take
Diversion chamber and the indoor proppant of water conservancy diversion out；
Step 3: calculating the original permeability under predetermined clossing pressure and predetermined sanding concentration conditionsk；Formula is as follows:
In formula:k- original permeability, μm2；
μThe viscosity of displacement liquid, mPa ﹒ s under-predetermined experimental temperature；
Q- displacement flow, cm3/s；
LLength between-diversion chamber pressure tap, cm；
A- diversion chamber overflow section product, cm2；
△P- inlet and liquid outlet are averaged pressure difference, kPa；
Step 4: diverting agent temporarily blocks up strength character test；It is specific as follows:
(1) diverting agent and proppant are inserted in diversion chamber jointly, diverting agent is laid in the middle part of diversion trench, the selection of proppant dosage
Depending on the predetermined sanding concentration of required measurement, the diversion chamber after the completion of loading is moved into experiment test platform, diversion chamber's water
Placing flat；
(2) pressure sensor, the inlet/outlet pipeline of diversion chamber are connected, each valve is in close state, and opens displacement pump to water conservancy diversion
Room builds the pressure, and displacement pumpage is controlled in 30mL/min, and diversion chamber builds the pressure to 2MPa, during which checks whether each pipeline leaks
Liquid phenomenon, if leakage situation occur should stop testing and reloading diversion chamber immediately；
(3) it opens vacuum pump to evacuate pipeline, evacuated time is greater than 30min, opens displacement pump, is saturated crack and pipeline
Test fluid；
(4) it opens hydraulic pressurization machine and closure stress is loaded to diversion chamber, stop after closure stress rises to predetermined clossing pressure
Pressurization, voltage stabling control are greater than 30min；
(5) preheater and heater, temperature are opened and are set as reservoir temperature, with flow 1mL/min forward direction displacement liquid, observe into
Mouth end pressure variation；
(6) diverting agent breakthrough pressure is tested by the way of pressurizeing step by step, pressure increases step by step according to 15%, pressure stabilizing test
10min continues to be pressurized if not breaking through, until there is continuous liquid outflow in outlet end, illustrates that diverting agent has been broken, records this
When maximum pressure be diverting agent breakthrough pressureP, the as temporary stifled intensity of diverting agent；
(7) after diverting agent breakthrough, continue positive displacement liquid, the permeability after measurement is broken through in 30mink 1 ；
(8) after the completion of testing, constant-flux pump is closed, opens the gate gurgle valve of hydraulic press, oil pressure is unloaded, dismantles the pipeline of diversion chamber, take
Diversion chamber and the indoor proppant of water conservancy diversion out；
Step 5: calculating temporarily stifled rate；Formula is as follows:
In formula:z- temporarily block up rate, %；
k- original permeability, μm2；
k 1 - rear permeability is temporarily blocked up, μm2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810337167.5A CN108956413A (en) | 2018-04-16 | 2018-04-16 | Temporary plugging strength performance evaluation method of temporary plugging agent in fracture for oil field fracturing |
Applications Claiming Priority (1)
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| CN112858578A (en) * | 2020-07-09 | 2021-05-28 | 中国海洋石油集团有限公司 | Plugging performance evaluation method of in-seam temporary plugging agent for tight gas reservoir hydraulic fracturing |
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| CN114441251A (en) * | 2020-11-05 | 2022-05-06 | 中国石油化工股份有限公司 | Seam temporary plugging effect evaluation device and evaluation method |
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| CN114509314A (en) * | 2020-11-17 | 2022-05-17 | 中国石油化工股份有限公司 | A method for evaluating the effect of temporary plugging in fractures |
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| CN111379537A (en) * | 2020-03-20 | 2020-07-07 | 西南石油大学 | A method for quantitatively evaluating the plugging strength of temporary plugging agents |
| CN111680457A (en) * | 2020-05-27 | 2020-09-18 | 大庆油田有限责任公司 | Numerical simulation method for evaluating plugging effect of plugging agent in fracturing process |
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| CN114459973A (en) * | 2020-10-21 | 2022-05-10 | 中国石油化工股份有限公司 | Evaluation device and evaluation method for temporary plugging strength of temporary plugging agent |
| CN114441320A (en) * | 2020-11-05 | 2022-05-06 | 中国石油化工股份有限公司 | Evaluation device and evaluation method for residual strength of liquid temporary plugging agent |
| CN114441251A (en) * | 2020-11-05 | 2022-05-06 | 中国石油化工股份有限公司 | Seam temporary plugging effect evaluation device and evaluation method |
| CN114441321A (en) * | 2020-11-05 | 2022-05-06 | 中国石油化工股份有限公司 | Evaluation device and evaluation method for residual strength of solid temporary plugging agent |
| CN114441321B (en) * | 2020-11-05 | 2023-09-15 | 中国石油化工股份有限公司 | Device and method for evaluating residual strength of solid temporary plugging agent |
| CN114441320B (en) * | 2020-11-05 | 2023-09-29 | 中国石油化工股份有限公司 | Device and method for evaluating residual strength of temporary plugging agent |
| CN114441251B (en) * | 2020-11-05 | 2023-09-29 | 中国石油化工股份有限公司 | Device and method for evaluating temporary blocking effect of seam |
| CN114509314A (en) * | 2020-11-17 | 2022-05-17 | 中国石油化工股份有限公司 | A method for evaluating the effect of temporary plugging in fractures |
| CN114739884A (en) * | 2022-04-01 | 2022-07-12 | 青岛石大华通科技有限公司 | An intelligent test method for fracturing proppant conductivity |
| CN114739884B (en) * | 2022-04-01 | 2025-03-14 | 青岛石大华通科技有限公司 | Intelligent testing method for conductivity of fracturing proppant |
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