Exploration and
appraisal | Theory of reservoir formation in an alkaline lake basin in a sag area | Conglomerate sedimentary model in a sag area. Bimodal high efficiency oil generation model in the source rock of the alkali lake basin. Large area reservoir formation pattern of conglomerate on source in a sag area. | Guide the exploration and deployment
of conglomerate oil field in a sag area and discover a large 10×108 t oil field. |
| Reservoir engineering | Multi-field multi-scale
seepage-flow
theory | The development of tight conglomerate is a multi-scale seepage-flow process from matrix to complex fracture network to wellbore coupled with temperature, pressure, stress and chemical fields. | Guide the optimization of numerical simulation, well testing and production analysis, fracturing and enhanced oil recovery in tight conglomerate oil fields. |
Theory of tridimensional multi-layer
staggered development | Multi-layer system, multi-layer staggered horizontal well pattern. Mixed well pattern, staggered fractures. Forming a coherent stress
field in space. The complex fracture network and multi-scale
coupled seepage field are constructed. Maximum economic
and effective use of reserves. | Guide and optimize the deployment of “best at the first” well pattern with TSSD, multiple factors synergetic optimization, enhanced oil recovery, fracturing-enhanced oil recovery integration, and full life cycle reservoir management. |
Drilling
engineering | Theory of integrated safe and high efficiency drilling | Mechanical stability mechanism of borehole wall in discrete tight
conglomerate. Mechanism of tight conglomerate reservoir protection. Hydrodynamics of complex trajectory annulus under temperature
and pressure coupling. High efficiency rock breaking mechanism
of strong heterogeneous conglomerate. | Guide the integrated design and optimization of drill bits, downhole drilling tool combinations, drilling fluids and drilling operation parameters. At the same time, the safety of drilling is guaranteed and the efficiency is improved through comprehensive optimization. |
Fracturing engineer-
ing | SBEFM theory of tight conglomerate | The mutual-supported structure of gravel is a rock fabric characteristic that is conducive to the formation of complex fracture network, which is different from the stratified fracture/natural fracture of shale. The strong heterogeneity caused by the change of gravel diameter and lithology is also a favorable condition to complicate the fracture network. SBEFM is the most important form to create conglomerate reservoir fracture. | Guide the modeling and evaluation
of fracturing network in tight
conglomerate, fracturing design
and process optimization |
| PFIM theory of in tight conglomerate oilfields | Interwell interference caused by volume fracturing of tight conglomerate has three mechanisms: stress-strain effect type, fluid arrival and connection type, fluid and proppant arrival and connection type. The dynamic changes of seepage field and stress field caused by fracturing can reduce the horizontal stress difference and produce coherent
effects similar to wave field. | Guide well layout and partial collaborative design, fracturing design and fracturing operation optimization of small well spacing stereo development
platform |
| Hydraulic fracture control and manipulate theory in tight conglomerate | Based on the failure mechanism of different types of tight
conglomerate, the transient and local stress fields and pressure
fields from near to far are changed actively to promote the
extension of hydraulic fracture in the desired way. | Guide the design and optimization of hydraulic fracture control technologies such as "Limiting the current, dynamic temporary plugging and diverting in intersegment and segment, temporary plugging and diverting in distal fracture, alternating load or pulse load". Develop high uniformity fracturing technology |