Abstract We study the propagation of a finite‐amplitude elastic pulse in long thin bar Berea sandstone. In previous work, this type experiment has been conducted to quantify classical nonlinearity, based on amplitude growth second harmonic as function distance. To greatly expand that early noncontact scanning 3‐D laser Doppler vibrometer was used track evolution axial component particle velocity over entire surface functions distance and source amplitude. With these new measurements,...

Abstract Various indirect measuring techniques are presently employed for estimating formation strength, which in turn is correlated to drillability and polycrystalline diamond compact (PDC) bit selection. Formation mechanical properties derived from conventional open-hole logs combination with a rigorous assessment of shear wave velocities can be used successfully determine as it pertains best determined unconfined compressive strength the angle internal friction assessment. Rock found...

Abstract In situ stress data plays a vital role in various stages of oil and gas well construction production, such as drilling, completion, stimulation, waste reinjection. But generally, its acquisition does not receive much attention it deserves, some times no attempt is made to collect this significant information. Most the time lack information compensated by guess or indirect related This situation evident from scarcity directly measured fields throughout world. Within Chevron, we have...

Summary Wellbore failure is best simulated in the laboratory by subjecting a model hole to in-situ stresses. A jacketed, thick-walled, hollow cylinder subjected increasing pressure on outer surface until collapse occurs. This provides direct measure of stress required cause that particular formation interval. To extrapolate downhole situation, 3D analytic presented applicable both stability and sanding open wellbores. uses Modified Lade criterion properly accounts for effect intermediate...

Combining the competencies of well engineer and geoscientist from earliest phases exploration is reaping economic benefit for major capital drilling projects (single wells costing at least US$25 million). As geologic geophysical modeling explorationist matures subsurface picture becomes clearer, appropriate design flexibility can be achieved using mechanical Earth model (MEM) technology. This approach to planning particularly beneficial deepwater exploration.

Abstract Wellbore integrity is a critical subject in oil and gas production, CO2 storage. Successful subsurface deposition of various fluids, such as CO2, depends on the storage site. In site, injection wells pre-existing might leak due to over-pressurization, mechanical/chemical degradation, and/or poor cement job, thus reducing sealing capacity Wells that microannuli or fractures order microns are difficult seal with typical workover techniques. We tested novel polymer gelant, originally...

Abstract Kotabatak field, Sumatra, Indonesia is a heavily-faulted field undergoing an aggressive drilling and development campaign. Nine horizontal wells had been drilled with four more planned in 2008. One of the recently experienced well collapse (and sudden productivity decline) after some time on production, cavings being flushed out during coil tubing workover operations. In addition to drilling, feasibility open completions, hydraulic fracturing design sanding onset prediction also...

Abstract Geomechanical modeling is playing an increasingly important role at Saudi Aramco during the earliest phases of field development planning. Field decisions are aided by accurate assessment well design options that closely tied to existing geological and engineering data set using geomechanics technology. Beginning reservoir, completion in highly productive mechanically weak sandstone formations, stronger – less formation intervals must be fracture stimulated produce, depend heavily...

Abstract It is important to understand the effects of introducing thermal changes in subsurface because such alter state stress and, ultimately, behavior formation. Inducing fractures formation may cause injection fluids advance at different rates through reservoir, thereby reducing areal sweep reservoir and overall efficiency a flooding operation. To avoid induced fractures, it necessary maintain water operations below fracturing (breakdown) pressure For these reasons, extremely model cold...

The involvement of the well engineer (WE) competency from<br>the earliest phases exploration is reaping economic benefit<br>for major capital projects (single wells costing at least<br>$25,000,000 US). As geological and geophysical modeling<br>work Explorationists matures subsurface picture<br>becomes clearer, appropriate design flexibility is<br>being achieved using Mechanical Earth Model (MEM)<br>technology. This approach to planning...

The Mont Terri Underground Research Laboratory (MT-URL) and Consortia affords member organizations the opportunity to bridge gap between bench large field scale experiments. At this underground test site, CCP4 (CO2 Capture Project Phase 4) partners, a four company collaboration that includes BP, Chevron, Petrobras Suncor, along with Swiss Topographic Survey (swisstopo) who operates laboratory, are conducting 1) an experiment focuses on mitigation of pressure leakages associated CO2...

Abstract Leakage in carbon storage and hydrocarbon wells continues to be an area of concern the development abandonment reservoirs. Industry need for a leakage remediation sealant that can perform systems beyond capability cement squeezes has driven CO2/pH activated "smart" gel. Exploratory laboratory tests mock field scale well test were performed determine effectiveness smart Control gel particle size distribution was demonstrated through batch synthesis experiments. Microfluidic...

In this letter, we present evidence for a mechanism responsible the nonclassical nonlinear dynamics observed in many cemented granular materials that are generally classified as mesoscopic elastic materials. We demonstrate numerically force chains created within complex grain-pore network of these when subjected to dynamic loading. The interface properties between grains along with sharp and localized increase stress occurring at grain-grain contacts leads reversible decrease macroscopic...

Various indirect measuring techniques are presently employed for estimating formation strength, which in turn is correlated to drillability and polycrystalline diamond compact (PDC) bit selection. Formation mechanical properties derived from conventional open-hole logs combination with a rigorous assessment of shear wave velocities can be used successfully determine as it pertains best determined unconfined compressive strength the angle internal friction assessment. Rock found correlate...

Abstract not provided to SSRN.

Abstract Wellbore failure is best simulated in the laboratory by subjecting a model hole to in-situ stresses. This can be routinely done on available core performing collapse test. test uses hollow cylinder with an outer diameter of 1.5 inches and 0.5 inches. The jacketed sample subjected increasing pressure surface until occurs. provides direct measure stress required cause that particular formation interval. To predict stability sanding, method for applying this measured strength downhole...

Consideration of the full cycle asset development plan from appraisal through abandonment reduces risk missed future opportunities caused by well systems design constraints. For example, reservoir pressure depletion and subsidence can impact borehole stability to extent that complex designs are necessary fully exploit asset. Well placement not only depends on subsiding section, but also reaction overlying geological section must be drilled reach reservoir. land-based operations, consequences...

Click to increase image sizeClick decrease size Additional informationNotes on contributorsMartha Naomi AltMikala L. Rahn, Harvey Goodman and Martha Alt research associate at MPR Associates, Brian Stecher is a social scientist RAND.

The integrity of the cement sheath is crucial part to maintain zonal isolation and prevent unwanted leakage injection fluid for CO2 wells. During lifespan an well, loads arising from multiple processes can affect state stress in wellbore system and, under severe conditions, may induce failure sheath. Different types failure, including debonding (micro-annuli), radial cracking, shear occur throughout life well cause problems dramatically reduces efficiency. MT-URL "Well-Sealing" experiment...

The CO2 Capture Project (CCP) is a unique collaborative technology development program initiated in 2000 with participants from corporations, academia, governments, research institutions, policy makers and individual contractors who came together to advance of new approaches capture store improve efficiencies existing technologies. overall objectives have been deliver major cost reductions for carbon demonstrate that geological storage safe, measurable, verifiable. Since 2000, the CCP...

Summary Understanding the cement hardening process and determining development of state stress in under specific downhole conditions are challenging but fundamental requirements to perform an accurate prediction wellbore integrity. As essential component stress, temporal variation pore pressure is a critical factor that affects occurrence failure. In this study, we present novel laboratory setup measure during representative conditions, including pressure, temperature, water exchange between...

Abstract The integration of core based rock mechanics with the open hole log and seismic geophysics technologies, has created added value through operational costs savings for Chevron's world-wide drilling completion holdings. Early development this integrated technology focused on supplementing measured property data measurements to obtain mechanical estimates throughout horehole. Log derived have lead worldwide use following applications:formation drillability assessment bit optimization...