OpenPath Sequence diversion stimulation service is the first in the industry to use degradable fibers to suspend multimodal particles—a combination that enables the sequential stimulation of zones and intervals to maximize near-wellbore coverage. Whereas particles alone are not always effective in isolating fractures of various sizes, the addition of fibers bridges the gaps in fractures and creates impermeable temporary plugs that fully dissolve after stimulation operations are completed. Because the diversion method is chemical rather than mechanical, OpenPath Sequence service is effective for both cased and openhole completions.
Sequentially stimulate zones and intervals for improved reservoir contact
OpenPath Sequence service uses the optimal acid identified for a particular reservoir to sequentially stimulate targeted zones and intervals. The service is compatible with conventional acid, an engineered acid designed specifically for OpenPath Sequence service, and our other proprietary acid systems including SXE emulsified acid, VDA viscoelastic diverting acid, and MaxCO3 Acid degradable diversion acid system.
Simplify operations
No specialized equipment is required, streamlining operations and reducing HSE risks as compared with conventional chemical diversion methods.
The OpenPath Sequence* diversion stimulation service improves well production by diverting acid stimulation systems into target zones. The service integrates modeling, a proven near-wellbore diversion system, and an acid system appropriate for reservoir conditions. The diversion system uses a composite pill containing a proprietary blend of degradable fibers and multimodal particles that effectively isolates the specified zone.
Application
The OpenPath Sequence service enables sequential stimulation of zones and intervals in cased hole and openhole completions. It can be used for selective temporary plugging of a region along the wellbore or for uniform distribution of the fluid along the wellbore to maximize wellbore coverage and reservoir contact.
Degradation
After treatment, the proprietary blend of fibers and particles fully degrades within hours or days at temperatures ranging from 130 to 300 degF. No intervention is required to ensure degradation, reducing costs and HSE risks.
Compatibility
OpenPath Sequence service can be used for stimulation treatments with coventional acid; an engineered acid designed specifically for the OpenPath Sequence service; or other proprietary acid systems including SXE* emulsified acid, VDA*
viscoelastic diverting acid, and MaxCO3 Acid* degradable diversion acid system.
APPLICATIONS
1.Acid fracturing and matrix treatments;
2.Conventional and unconventional formations;
3.Cased hole and openhole completions.
BENEFITS
Maximizes well productivity and completion efficiency with an innovative well stimulation technique;
Increases recovery by enabling sequential stimulation of multiple zones.
FEATURES
1.Fiber and multimodal particulate blend provides optimal plugging and diversion;
2.Fully degradable;
3.Suitable for downhole temperatures ranging from 130 to 300 degF[54 to 149 degC];
4.Can withstand differential pressure up to 4,500 psi [31.03 MPa] for acid fracturing or matrix stimulations.
OpenPath Sequence Service Increases Productivity Index More Than 300% for Kuwait Oil Company
Heterogeneous limestone reservoir presents acid stimulation challenge
A multilayer limestone reservoir located in the Sabriyah field of Kuwait is highly heterogeneous with natural fractures and multiple perforation intervals. To attain economical productivity for a vertical well in this reservoir, Kuwait Oil Company required an acid fracturing treatment designed to achieve good fracture conductivity, an extended fracture length, and effective diversion of some of the acid stimulation from the upper section of the formation to the lower section.
OpenPath Sequence service provides effective solution
Schlumberger recommended using OpenPath Sequence service to divert the acid stimulation to the target zones. The service accomplishes diversion through the use of a composite pill made of a proprietary blend of degradable fibers and multimodal particles that provides consistent, effective isolation plugs. Covering multiple reservoir layers in the same stage, the treatment also provides high leakoff control.
The treatment alternated between three acid stimulation stages and two diversion stages of OpenPath Sequence system composite pills to cover all perforation intervals and accomplish diversion from the upper reservoir to the lower reservoir.
Productivity index increases more than 300%
Diversion within the perforated intervals after placement of the OpenPath Sequence system composite pills was indicated by diversion pressures of 500 to 1,600 psi [3.45 to 11.03 MPa] and instantaneous shut-in pressure changes. Effective diversion was also confirmed by injection log data based on stationary spinner and temperature measurements.
Injection logging performed after the prejob injection and after each diversion stage indicated coverage of all perforation intervals. The injection flow profile for the upper reservoir intervals improved 70% after the first diversion stage and more than 150% after the second diversion stage. Injection logging also confirmed fracture initiation and propagation in the lower reservoir after the second OpenPath Sequence service diversion stage.
Production in terms of barrels per day improved by 243% after the treatment was complete. In addition, the productivity index increased more than 300%.
OpenPath Sequence service reduced both the cost and time needed to effectively fracture a very challenging well and opened the door for treating similar wells in the near future.”
——Mohammad Al-OthmanEngineering Unit HeadKuwait Oil Company
石油圈
