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Cutting Mechanism Study of an Innovative Non-Planar Cutter PDC Bit and Its Field Application
Ning Li,
Xueqing Teng,
Hongtao Liu,
Duanrui Zhang,
Bo Zhou,
Li Zhao,
Renqing He,
Jinsong Guo
Issue:
Volume 8, Issue 3, May 2020
Pages:
53-57
Received:
16 April 2020
Accepted:
7 May 2020
Published:
28 May 2020
Abstract: Tarim Kuqa tight sandstone reservoir is overlaid with extreme thick conglomerate, which has high compressive strength, strong heterogeneity and poor drill ability, resulting in low drilling ROP and less bit drilling footage. Through research study and analysis of PDC bit failure and wear modes, this paper described the development of an innovative non-planar PDC bit through cutting mechanism study and lab testing verification. When drilling through the strong homogeneity formation, it will still be surface contact between the non-planar cutter and the rock and therefore the rock-breaking mechanism is still the conventional shearing fracturing; When drilling through the heterogeneity formation, the convex ridges will generate the linear contact with the hard rock and the mechanical stress will be accumulated at the conglomerate surface to initially create the cracking and then break the rock with composite cutting mechanism of shearing and crushing to improve the rock breaking efficiency. Experimental results also showed that the non-planar cutter delivers several folds of impact resistance improvement over conventional cutter. The bit was successfully field tested in ultra-thick conglomerate layer in the Kuqa foreland thrust belt of the Tarim basin. The field test tripled bit footage and doubled ROP comparing to same intervals and formation in offset wells. It demonstrated the broader prospect of the non-planar PDC technology in conglomerate and highly heterogeneous applications.
Abstract: Tarim Kuqa tight sandstone reservoir is overlaid with extreme thick conglomerate, which has high compressive strength, strong heterogeneity and poor drill ability, resulting in low drilling ROP and less bit drilling footage. Through research study and analysis of PDC bit failure and wear modes, this paper described the development of an innovative ...
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Difficulties and Technical System in the Field of High Temperature and High Pressure
Peng Xuan,
Zhou Wei,
Li Jia,
Peng Xiaodong,
Wang Yongbiao
Issue:
Volume 8, Issue 3, May 2020
Pages:
58-67
Received:
10 May 2020
Accepted:
4 June 2020
Published:
28 June 2020
Abstract: The field of high temperature and high pressure is a key area of oil and gas exploration and development in China in the future, and it is also a very rich area of oil and gas resources. Unlike conventional oil and gas fields, high-temperature and high-pressure oil and gas fields are characterized by high-pressure systems, overlapping sand bodies and more complex gas-water modes. How to effectively predict the pressure, clear the distribution of sand and water, guide the smooth implementation of drilling operations, reasonable development plan is a key step. The authors analyze the reservoir in detail from pre-drilling pressure modeling technique, reservoir fluid fine identification and reservoir formation mechanism respectively. Finally, the Dongfang M gas field has a good effect after drilling, and the output and production capacity are all over expectations, especially for the development effect of low permeability breaking the ceiling of traditional low permeability reservoir development, and form a high temperature and high pressure implementation technology system to guide the subsequent development of similar areas.
Abstract: The field of high temperature and high pressure is a key area of oil and gas exploration and development in China in the future, and it is also a very rich area of oil and gas resources. Unlike conventional oil and gas fields, high-temperature and high-pressure oil and gas fields are characterized by high-pressure systems, overlapping sand bodies a...
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Production of Electricity from Flared Associated Gas as a Strategy for Reduction of Environmental Pollutions in Oil and Gas Sector (A Case Study of Niger Delta)
Mathew Chidube Udechukwu,
Ubanozie Julian Obibuike,
Anthony Chemazu Igbojionu,
Stanley Toochukwu Ekwueme
Issue:
Volume 8, Issue 3, May 2020
Pages:
68-74
Received:
28 February 2020
Accepted:
28 June 2020
Published:
13 July 2020
Abstract: The flaring of associated gas has become a global challenge. Aside the financial implication resulting from associated gas flaring, the environmental consequences are enormous and poses great threats to humans and the underlying ecosystem. The environmental implication is the degradation of the ecosystem resulting to loss of ecological lives, emergence of sicknesses, air, water and land pollution, release of poisonous gases that hamper human habitation, release of greenhouse gases resulting to global warming, severe respiratory diseases like asthma, bronchitis have been linked to flaring of associated gas in the host communities. The goal of the world health organization to completely eradicate gas flaring by 2030 has forced many countries to make laws that favour the utilization of associated gas and the further development of gas projects. Costly gas projects have undergone technological improvement, miniaturization and scaling to become portable and profitable ventures. In this paper, we propose means of utilising and monetising the flared associated gas in generation of electricity by a method known as gas-to-wire, this is the process of generating electricity from natural gas at or near the proximity of the field. The produced electricity is supplied to nearby host communities while surplus is supplied to the main electricity grid. Izombe production sites have been taken for case study. The turbine system used is a combined cycle gas turbine with a daily gas feedrate of 40MMscfd. The technical and economic parametres relative to the project are analyzed and discussed. The project promises a potential solution to the Nigeria electricity problem by diversification of electricity production and distribution and reduction in over-reliance on national grid.
Abstract: The flaring of associated gas has become a global challenge. Aside the financial implication resulting from associated gas flaring, the environmental consequences are enormous and poses great threats to humans and the underlying ecosystem. The environmental implication is the degradation of the ecosystem resulting to loss of ecological lives, emerg...
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