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公开(公告)号：US10947830B2
公开(公告)日：2021-03-16
申请号：US16257254
申请日：2019-01-25
Applicant: China University of Petroleum—Beijing
Inventor： Guangqing Zhang , Yuanxun Nie , Cankun Lin
Abstract: A fracturing method for creating a complex crack network by intermittent fracturing on site, which relates to oil and gas field development, and comprises the following steps: pumping a fracturing fluid into an oil well to enter the reservoir, continuing pumping the fracturing fluid into fractured cracks after a pumping pressure has reached a preset pressure, and stopping pumping the fracturing fluid after a preset condition has been reached; performing under-pressure shut-in for the oil well; stopping the shut-in operation when a signal detecting vehicle cannot receive an obvious microseismic signal in the under-pressure shut-in process; repeating the above three steps multiple times; pumping the fracturing fluid into the oil well to enter the reservoir by the fracturing truck until an amount of the pumped in fracturing fluid reaches a design pump-in liquid amount; pumping a sand-carrying fluid into the oil well to enter the reservoir by means of a sand blending truck and the fracturing truck after the amount of the pumped in fracturing fluid has reached the design pump-in liquid amount, and stopping pumping the sand-carrying fluid after the pumped in sand-carrying fluid has reached a preset sand adding amount.
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公开(公告)号：US20210054254A1
公开(公告)日：2021-02-25
申请号：US17080173
申请日：2020-10-26
Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING
Inventor： YANGCHUAN KE , CHENGCHENG YU
Abstract: The present disclosure provides a drilling fluid lubricant and a preparation method and use thereof. The preparation method includes steps of: 1) mixing styrene and water, then adding a nano-inorganic intermediate, a crosslinking agent and an emulsifier and stirring to obtain a first mixture; 2) under an inert atmosphere, stirring the first mixture to obtain an intermediate emulsion; then heating the intermediate emulsion to 70-85° C., then adding an initiator, keeping temperature and stirring for 7-10 hours to obtain an emulsion of polystyrene nanocomposite with a particle size of 40-90 nm; the emulsion of polystyrene nanocomposite being sequentially subjected to a granulating treatment to obtain polystyrene nanocomposite particles; 3) mixing industrial base oil, polystyrene nanocomposite particles and industrial oleic acid, and stirring evenly at room temperature to obtain the drilling fluid lubricant.
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公开(公告)号：US10921480B2
公开(公告)日：2021-02-16
申请号：US16362590
申请日：2019-03-22
Applicant: CHINA UNIVERSITY OF PETROLEUM—BEIJING
Inventor： Lizhi Xiao , Guangzhi Liao , Zhe Sun , Xin Li , Sihui Luo
IPC: G01V3/32 , E21B47/024 , E21B49/00 , E21B47/002
Abstract: The application provides a downhole three-dimensional scanning nuclear magnetic resonance imaging logging instrument and a probe, an antenna thereof, wherein the antenna comprises: an radio frequency antenna, an orienting device and a rotating device; the radio frequency antenna is fixed on an outer surface of the orienting device, and the orienting device is arranged on a magnet, the rotating device is fixed on the magnet; the rotating device is movably connected to the orienting device; and the rotating device is configured to drive the orienting device to rotate relative to the magnet, such that the radio frequency antenna on the orienting device can be drived to rotate, and echo signals in different directions can be acquired by the radio frequency antenna. The purpose of multi-directional measurement can be achieved, and the overall properties of an undisturbed stratum can be reflected by the applicant.
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公开(公告)号：US10889742B1
公开(公告)日：2021-01-12
申请号：US16887869
申请日：2020-05-29
Inventor： Guancheng Jiang , Yinbo He , Lili Yang , Kai Wang , Tengfei Dong , Xiaohu Quan , Kaixiao Cui , He Shi
Abstract: The present disclosure relates to the technical field of water-based drilling fluid, in particular to a modified polyhistidine suitable for being used as a supramolecular shale inhibitor, a method of preparing the same, and its application in water-based drilling fluids. The modified polyhistidine has a histidine polymerization main chain comprising a structural unit, which is represented by Formula (1) and attached with a modifying group, and the histidine polymerization main chain has a histidine polymerization degree of 6-9. The modified polyhistidine provided by the present disclosure is a degradable biological material and has the advantage of environmental friendliness; when the modified polyhistidine is used as a shale inhibitor, it can take advantage of its supermolecular property to effectively inhibit the hydration expansion of montmorillonite which is the most important expansion mineral in shale, and exhibits excellent inhibition effect and desirable temperature resistance.
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25.发明申请公开(公告)号：US20200370387A1
公开(公告)日：2020-11-26
申请号：US16923429
申请日：2020-07-08
Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING
Inventor： Yanbin WANG , Deli GAO , Jun FANG , Jing ZENG
IPC: E21B33/043 , E21B33/14 , E21B34/04 , E21B23/01 , E21B33/12
Abstract: A casing hanger and annulus sealing device running tool for deepwater drilling and a method for using the same. The running tool includes a spindle connected to a hollow suspension structure via a torque transmission structure, one end of the spindle slidably passes through a hollow piston, the suspension structure rotates with the spindle and slide along the piston, the inner cavity of the torque transmission structure communicates with that of the suspension structure to form a piston cavity; the piston cavity and the piston form a hydraulic piston structure; and one end of the suspension structure away from the torque transmission structure can rotatably hook to and lift upward to release the annulus sealing device, and one end of the piston away from the torque transmission structure can radially expand to hook to the casing hanger and can radially contract to release the casing hanger.
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Patent Agency Ranking
公开(公告)号：US10822913B2
公开(公告)日：2020-11-03
申请号：US16242099
申请日：2019-01-08
Applicant: China University of Petroleum—Beijing
Inventor： Yiqun Zhang , Ya Liu , Gensheng Li , Zhongwei Huang , Huaizhong Shi , Xianzhi Song , Mao Sheng , Lu Ji
Abstract: A plugging and wall reinforcing device and a method of using thereof. The nesting plugging and wall reinforcing device comprises an external slotted metal pipe and an internal nested blasting tool, wherein the slotted metal pipe has spiral slits or straight slits cut on a pipe wall thereof; the nested blasting tool is a mandrel having a surface provided with a plurality of explosive grooves in which explosives are placed; the slotted metal pipe is disposed around the mandrel, with a movable fit therebetween. The present invention can effectively improve the plugging success rate.
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公开(公告)号：US10815253B2
公开(公告)日：2020-10-27
申请号：US16459443
申请日：2019-07-01
Applicant: China University of Petroleum-Beijing
Inventor： Guangjin Chen , Bei Liu , Hai Li , Mingke Yang , Changyu Sun , Wan Chen
IPC: C07F3/06 , C07D235/06 , C07D233/56 , C07F15/06
Abstract: The present invention provides a preparation method for zeolitic imidazolate frameworks. The preparation method comprises: adding a metal carbonate or oxide, an organic ligand to a hydrophilic liquid to obtain a mixture; introducing an acidic gas to reach a reaction pressure of 0.1 MPa to 2.0 MPa, and reacting for a predetermined time; heating to 30° C.-60° C. and vacuuming to obtain the zeolitic imidazolate framework. The present invention also provides a zeolitic imidazolate framework obtained by the above preparation method. The preparation method according to the present invention is environmentally friendly and has a high yield.
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公开(公告)号：US10801302B2
公开(公告)日：2020-10-13
申请号：US16533468
申请日：2019-08-06
Applicant: China University of Petroleum—Beijing
Inventor： Jin Yang , Qishuai Yin , Shanshan Shi
Abstract: The present invention provides an inner start-up tool of a conduit bearing capacity reinforcing device and a using method thereof, the inner start-up tool comprising: an outer cylinder in which a pressure bearing disc is axially movably provided, a lower end of the pressure bearing disc being elastically connected with a balance block, and a first ring block and a second ring block being movably diametrically disposed through a lower cylinder walls of the outer cylinder; a first link mechanism having a first vertical rod and a first horizontal rod rotatably connected to the first vertical rod, the first vertical rod being rotatably connected to the balance block, the first horizontal rod being rotatably connected to the first ring block; a second link mechanism having a second vertical rod and a second horizontal rod rotatably connected to the second vertical rod, the second vertical rod being rotatably connected to the balance block, the second horizontal rod being rotatably connected to the second ring block. The inner start-up tool of the conduit bearing capacity reinforcing device and the using method thereof according to the present invention can be used for efficiently operating the conduit bearing capacity reinforcing device, is simple in structure and convenient in use.
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公开(公告)号：US20200278069A1
公开(公告)日：2020-09-03
申请号：US16870830
申请日：2020-05-08
Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING
Inventor： Yi Xiong , Da Yu , Kunpeng Zhao
Abstract: The disclosure provides a pipeline deformation detection PIG, including: a detection body and a foam body; the detection body is arranged in the foam body, and the detection body includes: a pressure sensing element; and the pressure sensing element includes: a pressure sensor and a pressure coupling unit. The detection body of the pipeline deformation detection PIG of the present disclosure is provided in the foam body, the inner side surface of the pressure coupling unit is in contact with the force receiving surface of the pressure sensor, and the outer side surface is in contact with the inner wall of the pipeline to be detected, the pressure coupling unit can translate the pipeline deforms into pressure according to coupling deformation, and meanwhile solve the stuck problem of the existing detection PIG in a large deformation pipeline.
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公开(公告)号：US20200181478A1
公开(公告)日：2020-06-11
申请号：US16212529
申请日：2018-12-06
Applicant: CHINA UNIVERSITY OF PETROLEUM - BEIJING
Inventor： LIZHI XIAO , INFANT RAJ , GUANGZHI LIAO
Abstract: The invention provides a modified MoS2 nano material and a preparation method thereof. The modified MoS2 nanomaterial is comprised of a hydrophilic MoS2 nanosheet linked with hydrophobic alkyl amine chain, the hydrophobic alkyl amine chain is provided by an alkylamine compound. The modified MoS2 nano material provided by the invention can be formulated into a nanofluid i.e. oil-displacement agent at a lower concentration, and is applied to the tertiary recovery in oil recovery, thereby greatly reducing the environmental pollution in the tertiary recovery, reducing the cost and improving the oil recovery.
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