scholarly journals Experimental Investigation of Force Response, Efficiency, and Wear Behaviors of Polycrystalline Diamond Rock Cutters

2019 ◽  
Vol 9 (15) ◽  
pp. 3059 ◽  
Author(s):  
Huaping Xiao ◽  
Shuhai Liu ◽  
Kaiwen Tan
Keyword(s):  
Cutting Force ◽  
Oil And Gas ◽  
Drilling Fluid ◽  
Polycrystalline Diamond ◽  
Friction Angle ◽  
Rake Angle ◽  
Oil And Gas Exploration ◽  
Drilling Technology ◽  
Air Drilling ◽  
Dry Conditions

Polycrystalline diamond compact (PDC) cutters are the most extensively used tool for rock drilling in superdeep oil and gas exploration, in which the air drilling technology without drilling fluid is highly promoted. This study examined the performance of PDC cutters in air drilling, including their friction angle, cutting force, specific energy, and wear behaviors, using a home-made testing apparatus and a commercial tribometer. It also investigated the dependence of cutting force on cutting depth and back rake angle. Results obtained in both dry conditions and in drilling fluid media were compared, and a tentative explanation to the observed differences was brought about by these two environments.

Mathematical Modeling and Analysis of Riser Gas Unloading Problem

2018 ◽  
Author(s):  
Raj Kiran ◽  
Saeed Salehi
Keyword(s):  
Oil And Gas ◽  
Numerical Models ◽  
Drilling Fluid ◽  
Extensive Study ◽  
Integrated System ◽  
Modeling And Analysis ◽  
Oil And Gas Exploration ◽  
Water Based ◽  
Point Pressure ◽  
Comparative Results

Pushing the boundaries of oil and gas exploration and development to new frontiers have led to exposure and more significant uncertainties, which necessitates robust strategies and techniques. With the increasing water depth, longer risers, and harsh pressure and temperature conditions; the risk of riser gas getting undetected get bigger. The lack of an integrated system to anticipate the controlling parameters at the choke below the BOP constrains the tackling operations and exacerbate the side effects of oil and gas well blowouts. This leads to an urgent need for an extensive study to address the riser gas unloading (RGU) events. This study encompasses the development of a robust model that can characterize the effect of different parameters such as temperature, mud types, back pressure, and solubility in RGU events. It also presents comparative results of oil-based and water-based mud systems, using a novel tool based on analytical and numerical models. The analytical model is constructed using combined gas law, heat transfer mechanism, and gas solubility and bubble point pressure concepts. Results suggest that the oil-based mud (OBM) takes more time for gas unloading in comparison to the water-based mud. Also, a significant deviation was observed in unloading patterns while considering temperature effect. For the drilling fluid without temperature consideration, the gas unloading occur in a smaller span of time and at a higher depth. Overall, this paper will demonstrate the effect of different parameters affecting the gas unloading in the riser, and present a comparative study of different parameters using an analytical which can be used in the field to get an idea of gas prior to any response for abnormality.

Theoretical and Experimental Studies of Internal Cuttings Removal Bit

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
Tong Cao ◽  
Kaian Yu ◽  
Wenxing Li ◽  
Xuyue Chen ◽  
Hongwu Zhu
Keyword(s):  
Oil And Gas ◽  
Drilling Fluid ◽  
Structural Parameters ◽  
Cone Angle ◽  
Experimental Studies ◽  
Polycrystalline Diamond ◽  
Screw Conveyor ◽  
Rotating Speed ◽  
Positive Effects ◽  
Two Samples

Abstract The oil and gas exploration without rig (also known as badger exploration) is a novel exploration technology that removes the need for fixed rig drilling, bringing with it the promise of huge savings in terms of time and money and its low impact on the environment. The implementation of this technology is an autonomous exploration tool, which can drill into rock using an electrically powered bit to loosen and crush the formation ahead of it, and crushed cuttings is moved through the device and deposited in the space behind it. Because there is no drilling fluid in badger drilling, a new way of transporting cuttings is urgently needed. In this paper, a new kind of bit named internal cuttings removal (ICR) bit is developed for badger exploration, and it can not only drill rock but also collect and transport cuttings to the bit behind through the inner cavity of the bit. Compared with the common polycrystalline diamond compact (PDC) bit, the junk slots are removed, but the helical blades and screw conveyor are added on the ICR bit. Theoretically, the two effects of rotating helical blades on cuttings moving are studied, based on the conditions of low and high rotating speed, respectively. Moreover, the rate of cuttings removal of the ICR bit is given in formulas, and in order to ensure the cuttings is removed from bottomhole timely, and the maximum permissible rate of penetration (ROP) of the ICR bit is proposed. Finally, two samples of the ICR bit with different structural parameters were built and tested in dry and wet rock drilling experiments, and experimental results show that the ICR bit can achieve the expected goal of ICR, but wet cuttings has a significant influence on the performance of the ICR bit. By comparing the drilling results of two bits, it can be found that the concave blade surface, a small number of blades, and small inner cone angle have the positive effects on the cuttings removal of the ICR bit. The above work is helpful for the development and implementation of badger exploration technology.

Phase Inversion of Complex Fluids With Implications to Drilling Fluids

2019 ◽  
Author(s):  
Gilles Numkam ◽  
Babak Akbari
Keyword(s):  
Energy Demand ◽  
Phase Inversion ◽  
Nonionic Surfactants ◽  
Oil And Gas ◽  
Drilling Fluid ◽  
Drilling Fluids ◽  
Extreme Temperatures ◽  
Immiscible Liquids ◽  
Oil And Gas Exploration ◽  
Oil In Water

Abstract Global energy demand continues to drive oil and gas exploration in increasingly challenging environments. The extreme temperatures and pressures drilling fluids are subjected to require optimum design of their rheology. Among the numerous components used in the design of drilling fluids are surfactants. Surfactants play an important role in the emulsification of immiscible liquids as well as the alteration of cuttings wettability to facilitate transport to the surface. Nonionic surfactants, depending on their chemical group allow the inversion of oil-in-water emulsions (O/W) to water-in-oil (W/O) and vice-versa depending on the direction of temperature change. In this study, emulsion-suspension samples were prepared with different nonionic surfactants at Oil:Water ratios of 50:50 and 60:40. The mechanical properties of the samples was assessed using a scientific rheometer at temperatures ranging from 0–90 °C. Phase inversion from oil-in-water to water-in-oil was observed for samples stabilized by polyoxyethylene oleyl ether surfactants. Build up in the apparent viscosity of the samples was observed following phase inversion, mainly resulting from the formation of nanosized dispersed water droplets. Findings in the study highlighted the possibility of obtaining different drilling fluid types during downhole circulation, thereby paving a path for the design optimization of drilling fluids used in offshore operations.

scholarly journals Stability Analysis in Determining Safety Drilling Fluid Pressure Windows in Ice Drilling Boreholes

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3378
Author(s):  
Han Zhang ◽  
Dongbin Pan ◽  
Lianghao Zhai ◽  
Ying Zhang ◽  
Chen Chen
Keyword(s):  
Stability Analysis ◽  
Oil And Gas ◽  
Drilling Fluid ◽  
Fluid Pressure ◽  
Failure Criteria ◽  
Borehole Wall ◽  
Polar Regions ◽  
Borehole Stability ◽  
Oil And Gas Exploration ◽  
The Stability

Borehole stability analysis has been well studied in oil and gas exploration when drilling through rock formations. However, a related analysis of ice borehole stability has never been conducted. This paper proposes an innovative method for estimating the drilling fluid pressure window for safe and sustainable ice drilling, which has never been put forward before. First, stress concentration on a vertical ice borehole wall was calculated, based on the common elastic theory. Then, three failure criteria, the Mogi–Coulomb, teardrop, and Derradji-Aouat criteria, were used to predict the stability of the ice borehole for an unbroken borehole wall. At the same time, fracture mechanics were used to analyze the stable critical pressure for a fissured wall. Combining with examples, our discussion shows how factors like temperature, strain rate, ice fracture toughness, ice friction coefficient, and fracture/crack length affect the stability of the borehole wall. The results indicate that the three failure criteria have similar critical pressures for unbroken borehole stability and that a fissured borehole could significantly decrease the safety drilling fluid pressure window and reduce the stability of the borehole. The proposed method enriches the theory of borehole stability and allows drillers to adjust the drilling fluid density validly in ice drilling engineering, for potential energy exploration in polar regions.

Relative Significance of Multiple Parameters on the Mechanical Specific Energy and Frictional Responses of Polycrystalline Diamond Compact Cutters

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Babak Akbari ◽  
Stefan Z. Miska
Keyword(s):  
Specific Energy ◽  
Polycrystalline Diamond ◽  
Friction Angle ◽  
Rake Angle ◽  
Fractional Factorial ◽  
Depth Of Cut ◽  
Relative Significance ◽  
Mechanical Specific Energy ◽  
Wellbore Pressure ◽  
Polycrystalline Diamond Compact

A high pressure single polycrystalline diamond compact (PDC) cutter testing facility was used to investigate the effect of five factors on PDC cutter performance on Alabama marble. The factors include: depth of cut (DOC), rotary speed, back rake angle, side rake angle, and confining (wellbore) pressure. The performance is quantified by two parameters: mechanical specific energy (MSE) and friction angle. Fractional factorial design of experiments methodology was used to design the experiments, enabling detection of potential interactions between factors. Results show that, in the range tested, the only statistically significant factor affecting the MSE is DOC. In other words, DOC's influence is predominant and it can mask the effect of all the other factors. These results could have applications in real time pore pressure detection. Further, the results show that back rake angle is the most statistically significant factor in friction angle. Side rake angle and depth of cut also affect the friction angle, but in a relatively unimportant manner. The MSE–DOC behavior is explained and modeled by cutter edge–groove friction and the circular cutter shape. It is speculated that high cutter edge friction overwhelms the actual cutting process. A comparison of five currently present models in the literature with these results is presented and the conclusion is that the future PDC cutter models should digress from the traditional shear failure plane models.

Development of the Natural Vegetable Gum Drilling and Completion Fluids System for Industrial Intelligent Application

2012 ◽  
Vol 443-444 ◽  
pp. 241-245
Author(s):  
Feng Xia Li ◽  
Guang Cheng Jiang ◽  
Zheng Ku Wang ◽  
Mao Rong Cui ◽  
Wen Hua Li
Keyword(s):  
Oil And Gas ◽  
Drilling Fluid ◽  
Petroleum Industry ◽  
Raw Material ◽  
Free Fluid ◽  
Main Concern ◽  
Oil And Gas Development ◽  
Fluid System ◽  
Oil And Gas Exploration ◽  
Completion Fluids

To ensure the fluids selected to drill and complete the well would simplify the operation for the oil and gas development in the petroleum industry, a natural vegetable gum drilling and completion fluids system is developed for the industrial intelligent application. As the system combines the advantage of the drilling fluid and completion fluid, it need not change the two different fluids during the operation, which is beneficial to the intelligent operation. In addition, the formulation of the proposed system has mainly taken the environment factor into consideration as the environmental protection has become main concern before the implementation of the oil and gas exploration. An extensive laboratory work of the natural vegetable gum drilling and completion fluids system is carried out, including the formulation study of the detailed system and the corresponding performance evaluation. In the system, the vegetable gum is chosen as raw material and TLJ-1 is optimally selected as the major treatment agent in the natural vegetable gum drilling and completion fluid system. The LV-CMC, polyglycol and QS-2 are taken as the auxiliary treatment agents for the system. And the three formulations, i. e. the solids-free fluid system, the low-solids fluid system and the weighting fluid system have been presented in this paper. The laboratory analysis has demonstrated that the prosperities of the system are proper for the industrial intellectual application, with the temperature resistance capability of 315 ℉.

Nano-SiO2/hydroxyethyl cellulose nanocomposite used for 210 °C sedimentation control of petroleum drilling fluid

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hao Wang ◽  
Ming Li ◽  
Jie Wu ◽  
Ping Yan ◽  
Gang Liu ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Drilling Fluid ◽  
Polymer Chains ◽  
Hydroxyethyl Cellulose ◽  
Cellulose Derivatives ◽  
Test Results ◽  
Natural Polymers ◽  
Excellent Thermal Stability ◽  
Temperature Resistance ◽  
Oil And Gas Exploration

Abstract Cellulose derivatives are widely applied in the field of oil and gas exploration. However, this kind of natural polymers always shows poor temperature resistance due to their organic nature. To improve the temperature resistance of hydroxyethyl cellulose (HEC), inorganic nano-SiO2 was introduced onto HEC polymer chains through the silylation coupling technique. And Fourier transform infrared spectrum (FTIR), X-ray photoelectron spectrum (XPS), and thermogravimetic analysis (TGA) were used to analyze the nanocomposite. As a result, nano-SiO2 particle is chemically coupled onto hydroxyethyl cellulose molecule, and nano-SiO2/hydroxyethyl cellulose nanocomposite (RJ-HEC) shows excellent thermal stability comparing with HEC polymer. In experiment, thermal aging tests were utilized, and test results suggest that nano-SiO2/hydroxyethyl cellulose (RJ-HEC) nanocomposite can be utilized as thickening agent of water-based drilling fluid, which shows improved rheology stability at 210 °C and excellent salt (NaCl) tolerance.

scholarly journals Synthesis and Performance Evaluation of a New Deoiling Agent for Treatment of Waste Oil-Based Drilling Fluids

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Pingting Liu ◽  
Zhiyu Huang ◽  
Hao Deng ◽  
Rongsha Wang ◽  
Shuixiang Xie
Keyword(s):  
Oil Recovery ◽  
Oil Content ◽  
Oil And Gas ◽  
Drilling Fluid ◽  
Drilling Fluids ◽  
Waste Oil ◽  
Oil And Gas Exploration ◽  
Treatment Conditions ◽  
Complex Process ◽  
And Performance

Oil-based drilling fluid is used more and more in the field of oil and gas exploration. However, because of unrecyclable treating agent and hard treatment conditions, the traditional treating technologies of waste oil-based drilling fluid have some defects, such as waste of resource, bulky equipment, complex treatment processes, and low oil recovery rate. In this work, switchable deoiling agent (SDA), as a novel surfactant for treatment of waste oil-based drilling fluid, was synthesized by amine, formic acid, and formaldehyde solution. With this agent, the waste oil-based drilling fluid can be treated without complex process and expensive equipment. Furthermore, the agent used in the treatment can be recycled, which reduces waste of resource and energy. The switch performance, deoiling performance, structural characterization, and mechanisms of action are studied. The experimental results show that the oil content of the recycled oil is higher than 96% and more than 93% oil in waste oil-based drilling fluid can be recycled. The oil content of the solid residues of deoiling is less than 3%.

scholarly journals Dual gradient drilling: a pilot test of decanter centrifuge for CAPM technology

2021 ◽  
pp. 70-79
Author(s):  
R. I. Ganiev ◽  
◽  
Luc Deboer ◽  
A. H. Agliullin ◽  
R. A. Ismakov ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Offshore Drilling ◽  
Oil And Gas Exploration ◽  
Deepwater Drilling ◽  
Well Design ◽  
Managed Pressure Drilling ◽  
Drilling Technology ◽  
Different Depths ◽  
Dual Gradient ◽  
Decanter Centrifuge

The article is about problem of drilling deepwater oil and gas wells that consists in complicating and increasing cost of their well design due to narrowing mud window at different depths. The authors analyse drilling technology developed and applied in practice of offshore drilling with a dual gradient drilling, which allows drilling significant intervals without overlapping an intermediate casing string. Based on analysis of these technologies and taking into account their disadvantages the authors proposed and tested a new drilling technology of dual gradient drilling with placement of all necessary innovative equipment on drilling platform. Keywords: managed pressure drilling; deepwater drilling; offshore drilling; dual gradient drilling; riser; oil and gas exploration in sea.

The history of UGS Strachocina investment as an example of success achieved by cooperation between a western company and Polish oil and gas companies

Nafta-Gaz ◽  
2021 ◽  
Vol 77 (11) ◽  
pp. 760-764
Author(s):  
Bogdan Filar ◽  
◽  
Mariusz Miziołek ◽  
Mieczysław Kawecki ◽  
Marek Piaskowy ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Drilling Fluid ◽  
Horizontal Wells ◽  
Gas Storage ◽  
Natural Fracture ◽  
Horizontal Section ◽  
Well Completion ◽  
Working Volume ◽  
Drilling Technology ◽  
Fluid Losses

In 2006 Oil and Gas Institute, Underground Gas Storage Department was given the task of designing the UGS Strachocina working volume, production and injection rates enlargement. Gas storage Strachocina is located in the south eastern part of Poland, near Sanok. The UGS Department ran some analysis before that date, which gave us the answer that the old vertical well technology would not be enough to achieve investment success. We knew that we needed to use horizontal well technology in which we had no experience at all. At that time there were only a few horizontal wells drilled in Poland. We decided to start cooperation with the company Baker Hughes, and asked them to help us to design the drilling technology and well completions. We knew that we needed to drill 8 horizontal wells in difficult reservoir conditions. Based on Baker Hughes’ recommendations, the EXALO Polish drilling company’s experience and the Institute’s knowledge of storage reservoir geology, the trajectories of 8 new wells were designed. Working with Baker Hughes, we designed the well completion based on expandable filters, the second time this type of completion technology had been used in the world at that time. During drilling, we were prepared for drilling fluid losses because of the extensive Strachocina reservoir’s natural fracture system. The investment was in doubt during the drilling of the first two horizontal wells because of huge drilling fluid losses and the inability of drilling the horizontal section length as designed. We lost 4000 cubic metres of drilling fluid in a one single well. During the drilling of the 2nd well, we asked Baker Hughes to help us to improve the drilling technology. Our partners from Baker Hughes prepared the solution in 3 weeks, and so we were able to use this new technology on the 3rd well drilled. It turned out that we could drill a longer horizontal section with less drilling fluid loss. The paper will show the idea of the project, the team building process, the project problems solved by the team, decisions made during the UGS Strachocina investment and the results. It will show how combining “western” technology and experience with “eastern” knowledge created a success story for all partners.

Sign in / Sign up

Export Citation Format

Share Document