Acid fracturing completion
PETRONOC offers an integrated solution for acid pressure completion throughout the entire process, focusing on the stimulation and transformation of carbonate and sandstone reservoirs. Our services integrate international advanced technologies with local operation experience, which can increase the production of a single well by 50% to 300%.
I. Core Technology System
Intelligent acid system
• PN-ACID series retarding acids (Temperature resistance 160 ° C /320 ° F)
Self-directed acid (VDA) enables the homogenization modification of non-uniform reservoirs
• Nanoscale acid-rock reaction inhibitor (slows down reaction rate by 40%)
Crack monitoring technology
• Microseismic monitoring (positioning accuracy ±5m)
Real-time inversion of temperature fields in distributed optical fibers (DTS/DAS)
Tracer monitoring assesses the contribution rate of each layer segment
Numerical simulation platform
• FracProPT 3D crack propagation simulation
• Geomechanical modeling (in-situ stress field analysis accuracy over 90%)
Ii. Specialized Craftsmanship
Process type | Applicable conditions | Production increase effect | Typical cases |
Multi-stage alternating acid pressing | Thick-layer heterogeneous reservoirs | Output has increased by 2 to 5 times | The Khurais oilfield in Saudi Arabia |
Closed acidification | Natural fractured strata | The diversion capacity has been increased by 8 times | The Mabrouk oilfield in Oman |
Acid pressing - gravel filling | The demand for sand control of loose sandstone | The overall increase in production was 180% | The Rumaila oilfield in Iraq |
Ultra-deep well acid pressure | Well depth > 6000 meters, temperature > 150℃ | The construction success rate is 100% | Bab oil Field in the United Arab Emirates |
Iii. Work Ability Matrix
Iv. Quality Control System
Material control
The purity of the main agent of the acid solution is ≥99.5%
The additive has been certified by ISO 13503
On-site QC testing (pH value, viscosity, corrosion inhibition rate)
Construction standards
The error of the pump injection program is less than ±2%
• Test the pipeline pressure to 1.5 times the working pressure
HSE management complies with OSHA standards
Effect evaluation
• Pressure drop analysis (to obtain the fracture's flow conductivity)
Production logging (PLT) quantifies the contributions of each layer
• 3-month follow-up parameter adjustment service
V. Typical Operation Procedures
Reservoir diagnosis stage (3-5 days)
Core tests (acid dissolution rate, stress sensitivity)
Secondary interpretation of logging data
• Small-scale Test Fracturing (DFIT
Scheme design stage (2-3 days)
• Preferred type of acid solution
• Construction scale simulation
• Economic assessment (ROI prediction)
On-site implementation stage (1-3 days)
• Wellbore preparation (well flushing, pipe scraping)
• Acid solution mixing (real-time density monitoring)
• Graded pump injection (including pre-liquid/replacement liquid)
Return exhaust management stage (5-7 days)
• Pressure control and return exhaust (0.5-1.0MPa/d reduction)
Residual acid treatment (neutralization to pH=6-8)
Vi. Cases of Technological Breakthroughs
The renovation project of Well NC-174 in Liberia
• Challenge
The reservoir temperature is 148℃
The permeability difference amounts to two orders of magnitude
• Innovative solutions:
◦ Temperature-activated self-turning acid is adopted
Real-time monitoring of temperature field changes through optical fibers
• Achievements:
The daily oil production has increased from 85bbl to 420bbl
The validity period lasts for 36 months
Vii. Equipment List
• 2000-type fracturing pump truck (Working pressure 103MPa)
• Continuous mixing device (liquid preparation accuracy ±0.5%)
• High-pressure manifold system (6"-10kpsi grades)
• Downhole memory pressure gauge (temperature resistance 175℃)
Viii. Service Area
Covering the major carbonate oil fields in the Middle East:
• Arab-D reservoir in Saudi Arabia
• Thamama Group from the United Arab Emirates
The Iraqi Mishrif team
• Oman Shuaiba Group