The “PIK-OFP-FD” equipment complex for assessing reservoir damage by injected fluids, drilling fluids

The PIK-OFP-FD complex is designed to determine filtration, capacitive and electrical core sample properties at reservoir conditions with stationary and non-stationary filtration and allows simulating process fluids impact on bottomhole reservoir zone.

Core holder plungers design provides process fluids pumping along sample end to form a colmatant crust. Core holder is equipped with several differential pressure measurement ports that allow user to evaluate pressure distribution along the core sample (samples column).

High-capacity pumps set provides process fluids continuous circulation. Special containers for process fluids are equipped with mixing system preventing solutions solid phase settling at reservoir conditions.

Base fluid filtration can be performed in both forward and reverse directions. Installation elements can be made of acid-resistant chromium-nickel alloys (Hastelloy C-276) to assess the effectiveness of colmatant crust and core samples acid treatments.

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Benefits/Capabilities:

Drilling fluid filtration through core samples and along core sample end to form a colmatant crust
Drilling fluid filtrate continuous circulation with linear velocities up to 0.5 m / s.
Up to 7 ports built into the core holder for determining differential pressure and resistivity profiles
Filtration process data registration with fluid flow rates, differential pressure and temperature graphical display.

Measured parameters

Phase permeability during two-phase filtration
Process fluids influence study
Absolute effective liquid permeability
Aggressive substance effectiveness (acid and alkaline compositions) affecting permeability of bottomhole reservoir zone.
Open porosity coefficient depending on changes at reservoir conditions
Acidic composition effectiveness when removing colmatant crust
Electrical resistivity

Technical specifications

Hydraulic system

Maximum crimp pressure, MPa	up to 70
Maximum pore pressure, MPa	up to 40
Working substance	· water with salinity up to 300 g / l · oil · drilling fluid and its filtrates · aqueous solutions of acids (acid-resistant): HCl – up to 20%; HF – up to 5%
Fluid-contact parts material	• stainless steel; • Hastelloy-C276 or equivalent (acid resistant)

Drilling fluid supply and circulation system

Pump type	automatic, plunger
Operating mode	• maintaining constant flow rate • maintaining constant pressure
Maintaining pressure accuracy, % (of full scale)	0,5
Maintaining the flow rate accuracy, % (of the current value)	0,5
Maximum working pressure, MPa	40
Linear drilling fluid filtration rate, m / s	up to 0,5

Core holder

Tested core diameter, mm	30 (optionally up to 110 mm)
Tested core length, mm	up to 300
Core sample type	composite
Fluid pumping ability	• in forward direction; • in opposite direction; • along core end to form colmatant crust • modeling solids deposition conditions on well wall
Maximum working crimp pressure, MPa	70
Maximum working pore pressure, MPa	40
Maximum working temperature, °С	up to +150
Saturation control	resistivimetric
Number of differential pressure measurement ports	from 2 to 7
Fluid-contact parts material	stainless steel, Hastelloy-C276 or equivalent (acid resistant)

Temperature maintenance system

Type	trolley heating chamber
Maximum working temperature, °С	+150
Heated elements	core holder, supply tubes, separation tanks

Drilling fluid tanks

Type	with dividing piston
Volume, mm	500/1000/1500
Maximum working pressure, MPa	40
Maximum working temperature, °С	+150
Fluid-contact parts material	stainless steel
Solution stirring	magnetic stirrer

Electrical resistance measurement module

Type	digital resistivity meter
Frequency, kHz	1
Accuracy, %	0,05

PC-based monitoring and control system

Control	pump flow/pressure, temperature, back pressure regulator, automatic valves
Data collection	pressure/differential pressure digital sensors, pumps flow rate, thermocouples, sample electrical resistance