Individual Drilling Bit Design and Optimization in Mahu Area

Zhang, Wenbo; Dang, Wenhui; Chen, Weifeng; Zhang, Yingjin

doi:10.1051/matecconf/201712805017

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…In order to establish the relationship between rock mechanics and acoustic transit time, firstly-according to the theory of elastic waves-dynamic elastic modulus and dynamic Poisson's ratio values are obtained using longitudinal and shear wave acoustic transit time logging data and density logging data. The calculation model is shown in Formulas ( 4) and ( 5) [18].…”

Section: Modeling Of Geological Drillability Parametersmentioning

confidence: 99%

Study and Application of Rock Drilling Resistance Characteristics in the Jiyang Depression Formation

Ma,

Cheng,

Zhu

2024

Processes

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In response to the unclear drilling resistance characteristics of rocks in the Ji’yang Depression, low drilling efficiency of PDC drill bits, and difficulties in drill bit selection, this study selected rock samples from different depths in the area for indoor drilling resistance analysis testing. Based on logging data, a prediction model was established for drilling resistance characteristics parameters of the strata in the area, and a graph of drilling resistance characteristic parameters of the rocks in the area was drawn. The study showed that the uniaxial compressive strength of the strata rocks was 50–110 MPa, with a hardness of 500–1300 MPa, a plasticity coefficient ranging from 1 to 2, a rock drillability grade of 8–20, and an abrasiveness index of 5–20. Combining the analysis of on-site drilling bit failures, PDC drill bits adapted to the strata in the area were selected, and the mechanical drilling speed of the selected bits reached 12.58 m/h, successfully drilling through the target layer. The above research results are of guiding significance for understanding the reasons for the difficulty of drilling into the Jiyang Depression strata and for improving mechanical drilling speed and drill bit selection in this area.

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Section: Modeling Of Geological Drillability Parametersmentioning

confidence: 99%

Study and Application of Rock Drilling Resistance Characteristics in the Jiyang Depression Formation

Ma,

Cheng,

Zhu

2024

Processes

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“…According to the analysis of the structure, material, and debris migration law of the bridge plug in the well, combined with wellhead pressure and gas-oil ratio, the high-pressure plug-in well control conditions and tool string combination are clarified to form a safe, The first well flushing tool string structure is shown below. applicable bridge plug drilling and grinding process plan and supporting technology [23].…”

Section: Design New Well Flush Tools To Ensure Operation Safetymentioning

confidence: 99%

Volume Fracturing Technology Application in the World's Largest Conglomerate Oil Field, Northwest of China

Yang

Gong

et al. 2020

Int. J. Petrol. Technol.

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One billion-ton super large oil field of Mahu is the largest oil and gas exploration achievement in China in recent years and has become the most realistic replacement area for increasing reserves and production in China as the world's largest conglomerate oil field till now. According to the complex reservoir-forming conditions in Mahu Sag, poor reservoir property, strong heterogeneity, and large sand body span, hydraulic fracturing in this area was facing serious challenges in fracture initiation and proppant placement. It has deepened the concept of volume fracturing technology and improved the effect of reconstruction; advanced chemicals to optimize replacement and reduce costs; tackled key perforation bridge plug with production technology to improve the level of operation according to 5 year’s stimulation experiences. The volume fracturing series technologies have been widely applied in 11 blocks and 97 wells in Mahu, including most of the exploration, evaluation, and development areas. For the tight conglomerate oil reservoir of Mahu, the fracturing and producing effects accompanied by economic development have been realized and effectively promoted, thus the average cumulative production increased by 37.5% per year.

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Finite-element simulation of PDC drill bit’s operational stress-strain state

Pryhorovska¹,

Pryhorovskyi²

2020

Visnyk TNTU

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The article presents finite-element simulation results of the PDC drill bit's operational stressstrain state in order to determine the most stressed and deformed areas in drill bit's operation. Operational stressstrain state of drill bit definition is important because external diameter of the drill bit is the main operation parameter; and drill bit external diameter decreasing is a cause of drill bit failure. There were simulated operations of PDC drill bit with welded blades and a solid drill bit. The authors used the Ansys Workbench (academic license version) to specify the biggest deformation areas. They are the welding joint areas and thread area. The authors considered the dependence of stresses and strains in these areas on the thickness of a welding joint. We can conclude that bits with welded blades are more prone to external diameter deformation; they have worse performance. This fact stipulates requirements for technology improvement of manufacturing these types of bits.

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Individual Drilling Bit Design and Optimization in Mahu Area

Cited by 3 publications

References 3 publications

Study and Application of Rock Drilling Resistance Characteristics in the Jiyang Depression Formation

Study and Application of Rock Drilling Resistance Characteristics in the Jiyang Depression Formation

Volume Fracturing Technology Application in the World's Largest Conglomerate Oil Field, Northwest of China

Finite-element simulation of PDC drill bit’s operational stress-strain state

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