The technical contributions highlighted this year focus on matrix stimulation of carbonate and unconventional reservoirs. Matrix stimulation encompasses pumping processes used to improve the connection between the wellbore and the reservoir. They are effective in a wide range of lithologies and have been successful in most types of completions—cased and open hole, horizontal and vertical, simple and complex, injectors and producers. Wells are matrix stimulated during completion and to remove production- or injection-induced impairment. The defining characteristic of matrix stimulation is the use of chemical systems to dissolve material in the near-wellbore region pumped below pressures that propagate reservoir fractures. Three papers are presented in this feature, and several others are referenced for the interested reader.
One of the papers, SPE 168198, “The First Visualization of Acid Treatments on Carbonates With 3D Nuclear-Magnetic-Resonance Imaging,” provides a detailed description of the application of cutting-edge technology to image acid-induced wormholes in carbonates. While this technology is new, it offers the promise of quantifying the effect of wormholes on near-wellbore flow to a degree that has not been possible until now. (See also SPE 171699, “NMR as a Characterization Tool for Wormholes: The Complete Picture.”)
While the industry has focused on fracture stimulation of unconventional reservoirs, SPE 173640, “Monitoring Acid-Stimulation Treatments in Naturally Fractured Reservoirs With Slickline Distributed-Temperature Sensing,” demonstrates the value of matrix stimulation in a shale reservoir. It is a good example with some excellent data on distributed-temperature-sensing profile monitoring, and it shows how naturally fractured reservoirs, which have generally been a challenge for stimulation, can be addressed. Distributed-temperature-sensing technology continues to develop, and a number of papers have been presented in the past year describing new capabilities and interpretation methods. (See, for example, SPE 173686, “Optimization of Matrix Acidizing With Fluids Diversion in Real Time Using Distributed-Temperature Sensing and Coiled Tubing”; SPE 172546, “Setting a New Milestone in Carbonate Matrix Stimulation With Coiled Tubing”; and SPE 171021, “First Installation of Efficient and Accurate Multilaterals-Stimulation Technology in Carbonate Oil Application.”)
The stimulation process can also be improved by applying classical concepts from reaction engineering and other disciplines. Paper SPE 171766, “Challenge of Acidizing Horizontal Wells in Tight Carbonate Reservoirs: Weak Acid and Nonacid Alternatives,” is an excellent example. The lesson is to look in both directions, back to the technical basics and forward to embrace new technologies.
Recommended Additional Reading
SPE 171699 NMR as a Characterization Tool for Wormholes: The Complete Picture by Yaser Al-Duailej, King Fahd University of Petroleum and Minerals, et al.
SPE 173686 Optimization of Matrix Acidizing With Fluids Diversion in Real Time Using Distributed-Temperature Sensing and Coiled Tubing by Eber Medina, Pinnacle, et al.
SPE 171021 First Installation of Efficient and Accurate Multilaterals-Stimulation Technology in Carbonate Oil Application by Kevin Rice, Fishbones, et al.
Lee Morgenthaler, SPE, Senior Staff Production Chemist, Shell
01 June 2015
Coiled Tubing With Real-Time-Measurement Tools Helps Overcome Stimulation Problems
The treatment in a deepwater, frac-packed well with fiber-optic-equipped coiled tubing (CT) and a rotating, hydraulic high-pressure jetting tool achieved successful stimulation of a 500-ft-long frac-packed zone after several previous failures using different techniques.
Monitoring of Matrix Acidizing by Use of Resistivity Measurements
This paper describes the testing of a novel concept based on resistivity measurements to monitor acid-stimulation operations.
Novel Coiled-Tubing Perforation Technique and Stimulation in Carbonate Gas Well
This paper discusses a novel approach to abrasive perforating, including the first-ever use of an acid-soluble abrasive material and ending with CT-jetting-assisted nitrified stimulation.
15 January 2018
16 January 2018
11 January 2018
11 January 2018
12 January 2018