6results about How to "Improve cementing quality" patented technology

The application discloses a salt-resistant water-non-dispersible material for oil well cement and a preparation method thereof. The salt-resistant water-non-dispersible material for oil well cement comprises the following components in the form of weight parts: 100 parts of N,N-dimethyl acrylamide, 3-6 parts of acrylic acid, 10-20 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-15 parts of a cyclic monomer, 0.1-0.4 parts of a branching agent, 5-15 parts of a cationic monomer, 0.3-3 parts of a crosslinking agent and 400-500 parts of water. The salt-resistant water-non-dispersible material prepared by the application has good salt resistance, can significantly improve the anti-dispersion performance of the cement slurry when used in a salt water and sea water cement slurry system with a NaCl content of 18 wt% or less, and has excellent rheological performance.

This invention belongs to the technical field of cementing devices, specifically relating to a foamed cement slurry cementing device. It aims to solve the problem of uneven foam distribution within the foamed cement slurry that ultimately settles on the wellbore, reducing cementing quality. The invention includes a reinforcement pipe, a delivery pipe, an external wellbore base, a return assembly, a drive assembly, and an injection head. This invention can introduce foamed cement slurry from well sections with higher foam content back into well sections with lower foam content for circulation, thereby ensuring the uniformity of foam distribution and size within the foamed cement slurry during its flow through the delivery pipe and return cavity, thus improving cementing quality.

The present application belongs to the technical field of drilling, and particularly relates to a hydraulic casing centralizer and a use method thereof. The hydraulic casing centralizer comprises an upper joint and a lower joint. A sliding assembly is slidably connected in the upper joint. An operating plate is connected to one end of the sliding assembly facing the lower joint. A centralizing arm is hingedly connected to one end of the lower joint facing the upper joint. The wedge shape on the operating plate matches the wedge shape on the centralizing arm. A hydraulic separation device and a flow channel are arranged on the sliding assembly. Liquid flows into the space between the sliding assembly and the upper joint through the flow channel. The hydraulic separation device drives the operating plate to move towards the centralizing arm according to the pressure setting value. A limiting assembly is arranged between the sliding assembly and the upper joint to limit the position of the operating plate after movement. The operating plate drives the centralizing arm to rotate and support the well wall by using the wedge shape matching the centralizing arm. The centralizer forces the casing string to be centered in the wellbore, thereby improving the cementing quality.

The utility model discloses a reinforced well cementation casing centralizer tool, the main body structure adopts the seamless steel pipe of spring steel, after cutting, the integral main body structure of further processing is formed after the integral processing, the upper sleeve and the lower sleeve of accommodating and sleeving in casing are located in the upper and lower both ends, and the multiple centralizing ribs of longitudinal arrangement between the upper sleeve and the lower sleeve and in the middle part, multiple centralizing ribs are arranged on the outer peripheral surface of upper sleeve and lower sleeve along the circumferential direction of upper sleeve and lower sleeve and are integrally formed connection with upper sleeve and lower sleeve, and the centralizing rib is outwardly inclined from the upper and lower both ends to the axis of casing, and a stress groove is arranged in the middle position of each centralizing rib to increase the reset force after deformation, and the fluid flow channel is formed between the adjacent two centralizing ribs, and the brush is fixed on the outside of upper sleeve and lower sleeve, and the brush is in contact with the well wall to destroy and remove the well wall mud cake. The application can ensure that the casing can smoothly enter the well, and improve the well cementation quality.

This invention discloses a tailpipe cementing annulus pressure-holding tool and its usage method, belonging to the field of tailpipe cementing technology. The tailpipe cementing annulus pressure-holding tool includes: an upper connector, a valve control unit, a valve plate, a valve seat, and a lower connector; the upper connector and the lower connector are fixedly connected; the valve control unit is slidably disposed inside the upper connector and the lower connector, and the valve control unit abuts against the upper connector and the lower connector respectively; one end of the valve control unit abuts against one side wall of the valve plate; the valve plate is rotatably connected to the valve seat; the valve seat is sleeved inside the lower connector, and the outer wall of the valve seat abuts against the inner wall of the lower connector; the valve seat is tubular, with two V-shaped grooves symmetrical about the center of the valve seat on its side wall. The tailpipe cementing annulus pressure-holding tool of this invention has a simple structure, reliable function, and is applicable to tailpipe cementing operations of most casing types, effectively improving cementing quality.

This invention discloses a cement sheath micro-gap pressure testing device, method, data, medium, and application, relating to the field of oil and gas well sealing technology. It includes an outer casing and an inner casing, with the outer casing fitted over the outer side of the inner casing, forming an annular cavity between them; a sealing element that seals the inner cavity of the inner casing; a pressure injection system connected to the inner cavity of the inner casing; a pressure control system connected to the pressure injection system; an acoustic logging tool housed within the inner cavity of the inner casing; a logging control system connected to the acoustic logging tool; a micro-gap size acquisition system; and a data association system. This invention can simulate the generation and evolution process of cement sheath micro-gap under varying downhole pressure conditions, establish a calibration relationship between acoustic response and micro-gap state, and provide experimental basis for evaluating cement sheath sealing integrity and optimizing cementing quality.