A new circular pneumatic punch for geological exploration well drilling

1985 ◽  
Vol 21 (2) ◽  
pp. 151-154 ◽  
Author(s):  
A. D. Kostylev ◽  
B. B. Danilov ◽  
B. N. Smolyantiskii ◽  
Yu. N. Syryamin ◽  
D. I. Kogan ◽  
...  
Keyword(s):  
Pneumatic Punch ◽  
Geological Exploration ◽  
Well Drilling ◽  
Exploration Well

scholarly journals The application of VOI method to shape a strategy of additional exploration

2021 ◽  
Vol 6 (3) ◽  
pp. 61-70
Author(s):  
Konstantin S. Grigoryev ◽  
Andrey V. Roshchin ◽  
Kseniya S. Telnova ◽  
Rinat M. Valiev ◽  
Alexey M. Stolnikov ◽  
...  
Keyword(s):  
Probabilistic Models ◽  
Optimal Placement ◽  
Well Drilling ◽  
Exploration Strategy ◽  
Geological Modelling ◽  
Information Method ◽  
Exploration Drilling ◽  
Early Exploration ◽  
Necessary And Sufficient ◽  
Exploration Well

Background. An optimal exploration strategy creates a significant share in value of project on exploration stage. The paper describes an example of solving the following tasks: determining the feasibility of additional exploration drilling; evaluating the value of drilling of one or more exploration wells; determining the optimal placement for exploration wells and drilling order. Authors presenting the modification of VoI (Value of Information) method and its application. Materials and methods. Complex probabilistic models were created summarizing main uncertainties and limitations, both geological, technical and technological. At the first stage three equiprobable geological concepts were made. For each concept probabilistic geological modelling was proceeded and then realizations corresponding to values of reserves P10, P50, and P90 were selected. Further, detailed production forecasts and economic estimates were performed. The analysis used the well pad and the corresponding area for exploration drilling as a unit of calculation. In the article the authors introduced the concept of remaining uncertainty. Application of modified VoI method allowed to form ‘dynamic’ (i.e. depending on exploration wells drilling order) range of areas for additional exploration which provide the best decrease of remaining uncertainty. An additional exploration strategy has been formed, which includes the necessary and sufficient number of wells and their drilling order. A decision tree was created depending on the success or failure of each subsequent exploration well. Results. The use of the modified VoI approach made it possible to achieve the objectives and obtain economical estimates, all of which combined to facilitate the adoption of decisions. As a result, a program for two exploration well drilling was created which would reduce the uncertainty by 90% from its initial value. Conclusions: The adopted VoI method could be applied to fields at the stage of additional exploration as well as to fields at early exploration stage to develop an exploration drilling strategy.

scholarly journals PRODUÇÃO DE METANO DE CARVÃO MINERAL EM BACIAS DE CARVÃO MOÇAMBICANAS: UMA ENERGIA ALTERNATIVA VIÁVEL

2020 ◽  
Vol 39 (1) ◽  
pp. 245-252
Author(s):  
Aniceto Elcidio Alves MACIE ◽  
Drielli PEYERL ◽  
Edmilson Moutinho dos SANTOS ◽  
Denise de La Corte BACCI
Keyword(s):  
Coalbed Methane ◽  
Energy Demand ◽  
Alternative Energy ◽  
Calorific Value ◽  
Coal Basin ◽  
Well Drilling ◽  
Production And Consumption ◽  
The Government ◽  
Exploration Well

The present study analyzed the potential of coalbed methane (CBM) generation as a viable alternative energy source of production in the Mozambican coal basins considering the geology, the properties of the coal and the respective potentialities. It should be noted that one of the most important coal bearing sedimentary successions in the world occurs in the Moatize-Minjova coal basin, Mozambique. In the analysis of the rank of the types of coal suitable for the production of CBM, the most recommended are the coal or bituminous type that has high levels of CO2, high calorific value and higher concentration of gas, however, this quality is found in the Moatize-Minjova coal basin. Exploration well drilling data collected by the company ETA STAR Mozambique and analyzed by specific laboratory tests, such as: physical-chemical, mineralogical, geochemical and petrography analyzes, facilitated the knowledge of the geology and the economic viability of the reservoir with a view to determination of the quality and volume of gas contained in the layers of coal as a viable source of energy in the country. Thus, it is anticipated that the result of the pioneer study carried out by the Company ETA STAR Mozambique indicates that this coal basin of Moatize has qualities to generate the coalbed methane. It is also emphasized that the other five coal basins present in the region due to the presented geological characteristics probably have an economically feasible potential for production. In this way, the exploration of the CBM would be a preponderant solution to answer the problematic of the energy demand for the national consumption. However, in order to exploit the CBM's potential in the country, the Government of Mozambique could introduce a specific CBM policy to legally guide the research, exploration, production and consumption of methane gas contained in the coal layers Mozambican.

First Look-Ahead VSP Guided Salt Dome Island Exploration Well Drilling in the UAE

2021 ◽  
Author(s):  
Muhammad Waqas ◽  
Abdulla Saad Alkobaisi ◽  
Ashraf Yahia ◽  
William H Borland ◽  
Muhammad Atif Nawaz
Keyword(s):  
Structural Model ◽  
Survey Design ◽  
Gravity Data ◽  
Seismic Profile ◽  
Salt Dome ◽  
Reverse Fault ◽  
Well Drilling ◽  
Look Ahead ◽  
Zero Offset ◽  
Exploration Well

Abstract An exploration well offshore UAE, which was the first of it's kind, was planned to be drilled from an island and within salt dome. Well planning was based on a structural model that was estimated using coarse 2D surface seismic (with no line crossing planned well location) and gravity measurements. This model, therefore, had a large uncertainty as to the salt location and geometry. Concerns of potential drilling hazards associated with salt required utilizing the ability of borehole seismic to look-ahead of bit to image salt and direct the well such that it would be sufficiently far away from salt face. Pre-job survey planning was first made assuming salt face to the northwest (based on gravity data) of wellhead and that the well would remain outside the salt. To ensure the well remains close, but not too close, Vertical Seismic Profile (VSP) was planned to include Salt Proximity Survey. Just prior to spudding, a surface core indicated salt was, in fact, southeast of wellhead, thus changing the objectives of VSP from locating how far away the well was from salt, to how soon will it exit salt. After survey modeling for four possible scenarios, Look-ahead Zero-Offset and Offset VSPs were acquired using vibroseis at the island, at each of four casing points and rapidly processed to guide drilling next sections. In the 26" section, the well started drilling in salt and there was concern that there would be problems with casing design if the well did not exit salt before 4000 ft. A Zero-Offset and Offset VSP were shot for reflection imaging off the salt face. The survey indicated the salt face was approaching the well but at low rate (due to dip) to ensure an exit before 4000 ft. The well was deviated southeast and it exited the salt at 3620 ft. In the 17.5" section, a second run of Zero-Offset and Offset VSP were acquired indicating the salt face was still moving away from the well toward the northwest. In the 12.25" section, a third set of Zero-Offset and Offset VSP was shot. This survey confirmed the salt face was moving continually northwest and it was suggested the well deviate northwest to remain closer to salt. A large reverse fault was also clearly imaged and confirmed by drilling. In the 8.5" section, the well was drilled northwest at high angle as could be tolerated until it was TDed below target formation "A". The final set of Zero-Offset and Offset VSP results showed the salt was, at the level of formation "A", farther northwest than could be imaged by these VSP. There has been little to no experience of drilling salt dome islands in Abu Dhabi. This paper demonstrated how look-ahead VSP guided exploration well drilling in the salt dome island. Out-of-the-box survey design and rapid turnaround processing successfully aided in imaging location of the salt face and allowed casing points to be made without having to plug back and sidetrack. Once out of the salt, VSP allowed the well to be drilled closer to salt without re-entering it.

Deep Directional Electromagnetic Technique Improves Well-Drilling Efficiency

2021 ◽  
Vol 73 (10) ◽  
pp. 51-52
Author(s):  
Chris Carpenter
Keyword(s):  
Real Time ◽  
Oil And Gas ◽  
Asia Pacific ◽  
Well Testing ◽  
Well Drilling ◽  
Carbonate Formation ◽  
Look Ahead ◽  
Well Efficiency ◽  
Interval Coverage ◽  
Exploration Well

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 202265, “Leap of Faith From Conventional to EM Look-Ahead: A Game-Changing Technology To Improve Well Efficiency,” by Muhamad Yanuar Mahardi, Hendarsyah Hendarsyah, and Kharisma Endarmoyo, PT Pertamina, et al., prepared for the 2020 SPE Asia Pacific Oil and Gas Conference and Exhibition, originally scheduled to be held in Perth, Australia, 20–22 October. The paper has not been peer reviewed. The structure in the Matindok block in Central Sulawesi operated by Pertamina has proven producible gas reserves in the Minahaki formation. One of the main challenges in this area is the low resolution of seismic data, leading to a high depth uncertainty. The complete paper describes a technology developed to meet these challenges with the capability to map and detect lithology changes ahead of the bit in real time. Geological Background A first exploration well, PEP-001, was drilled in 2018. The structure has a Miocene carbonate buildup play, and the target reservoir is the M pinnacle carbonate reef. The PEP-001 well was planned to set the 9⅝-in. casing point above the top of the M formation. Offset wells did not show any clear markers in the thick shale above the M formation that could have been used for log correlation. In previously drilled offset wells, correlation was performed convention-ally by examination of cutting samples and on drilling breaks. However, when Well PEP-001 was drilled, no apparent drilling break was observed. By the time cuttings reached the surface, the bit had drilled into 20 m of the M formation. Because the casing covered most of the upper carbonate formation, openhole logging and well-testing data were not acquired to delineate the target formation optimally. The second exploration well, PEP-002, was planned with an objective of setting 9⅝-in. casing approximately 5 m above the top of M to acquire full-interval coverage of coring, openhole wireline logging, and well testing. This information was critical for optimal reservoir delineation to allow for accurate reserves calculation and future development. Conventional correlation methods have proven insufficient for casing point placement. The presence of limestone stringers in offset wells within proximity of the top of M presented an additional challenge. The stringers could have been misinterpreted as the main carbonate body, if interpretation were based solely on cutting samples. Real-Time Electromagnetic (EM) Look-Ahead Technology

Application of geomechanical modeling for well drilling on the Kosukhinskoye field

2018 ◽  
pp. 41-45
Author(s):  
O.V. Grachev ◽  
◽  
D.V. Malyutin ◽  
A.A. Pimenov ◽  
T.R. Yalaev ◽  
...  
Keyword(s):  
Well Drilling
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