193 results about "Casing string" patented technology

A method comprises hydraulically fracturing a subterranean formation by introducing a fracturing fluid comprising coke proppant particles and a carrier fluid into the formation, where the carrier fluid has a base viscosity of at most 0.8 centipoise (cP) at 25 degrees Celsius (° C.). A hydrocarbon well comprises a wellbore that extends within a formation, a production casing string that extends within the wellbore, perforation clusters formed within the production casing string, hydraulic fractures formed in the formation proximate to the perforation clusters, and a fracturing fluid comprising coke proppant particles and a carrier fluid within at least a portion of the hydraulic fractures, where the carrier fluid has a base viscosity of at most 0.8 cP at 25° C. Another method comprises providing a carrier fluid having a viscosity of at most 0.8 cP at 25° C. and forming a fracturing fluid comprising the carrier fluid and coke proppant particles.

The invention discloses a sliding sleeve opening and closing claw structure for oil and gas well half-way well cementation and an unlocking method, and belongs to the technical field of oil and gas exploitation, the sliding sleeve opening and closing claw structure comprises a casing string, a sliding sleeve, a slip assembly and an opening and closing claw assembly, an external groove is formed in the inner wall end of the casing string, the sliding sleeve is arranged in the external groove in a sliding mode, and the slip assembly comprises a front slip, a rear slip and a vacant groove; the front slip and the rear slip are coaxially arranged and fixedly connected, a vacant groove is formed between the front slip and the rear slip, and the switch claw assembly is movably arranged in the vacant groove and used for adjusting the position of the sliding sleeve in an external groove. The opening and closing states of the sliding sleeve in the casing string can be synchronously controlled, and when the sliding sleeve is clamped in the casing string, the built-in linkage structure can be used for automatic unlocking, so that the sliding sleeve assembly is prevented from being permanently clamped in the casing string.

A specialized wireline-conveyed collet baffle, adapted for use with a conveying tool, setting tool, and explosive charges, for perforating and fracking a wellbore. The collet baffle like prior art baffles possesses an annular ring for engaging a circumferential annular groove in a casing, but unlike prior art baffles possesses an inner annular hollow ring member which may be actuated by a push rod of a setting tool and slidably repositioned when such annular ring underlies and is engaged with the circumferential groove on a casing sub, thereby retaining the collet baffle in place in the casing string when the conveying tool, setting tool, and explosive charges are subsequently re-positioned uphole. An adapter tool for coupling the collet baffle to a conventional setting tool, a wireline system employing the specialized collet baffle and adapter tool, and a method for perforating and fracking a wellbore are further disclosed.

The angle-adjustable underwater well mouth comprises a high-pressure well mouth, a low-pressure well mouth and a low-pressure well mouth extension sleeve, the high-pressure well mouth and the low-pressure well mouth are positioned and adjusted in direction through a first well mouth spherical pair, and the high-pressure well mouth and the low-pressure well mouth are locked through a locking ring; in the tie-back operation mode, a high-pressure well mouth is connected with a flexible insertion sealing pipe through a high-pressure well mouth thin-wall extension sleeve, a tie-back tail pipe hanger is arranged in a low-pressure well mouth extension sleeve, a guide cylinder is arranged at the upper end of the tie-back tail pipe hanger, and a guide head is arranged at the lower end of the flexible insertion sealing pipe. The flexible insertion sealing pipe can enter the tie-back tail pipe hanger under the guiding action of the guiding head and the guiding cylinder; in the non-tie-back operation mode, the common extension sleeve is connected below the high-pressure wellhead, and the sleeve string is connected below the common extension sleeve. The inclined high-pressure wellhead is adjusted to be approximately vertical as required, so that a service tool, a blowout preventer and a Christmas tree are convenient to mount, the stability of the wellhead is enhanced, and the operation risk is reduced.

A method of sealing leaks in oil and gas wells includes: removing a portion of an inner casing string within a wellbore to access an annulus associated with an area of fluid leakage; filling a first portion of the annulus with a first metal alloy to form a first metal alloy layer; filling a second portion of the annulus with cement to form a cement layer over the first metal alloy layer; and filling a third portion of the annulus with a second metal alloy to form a second metal alloy layer over the cement layer. The first metal alloy layer, the cement layer, and the second metal alloy layer together seal the annulus.

A method includes setting a primary plug within a wellbore flowpath defined through a radially innermost casing string of a plurality of concentric casing strings, operating a laser milling tool within the wellbore flowpath to discharge a laser beam into the wellbore flowpath to thereby mill a window through the radially innermost casing string and radially outward towards a radially innermost cement column of a plurality of respective cement columns surrounding each of the concentric casing strings, discharging an abrasive fluid from an abrasive jetting tool into the wellbore flowpath and cleaning out the radially innermost cement column to expand the window radially, flowing a secondary plug material into the window and the wellbore flowpath above the primary plug, solidifying the secondary plug material to form a solidified secondary plug within the window, and drilling out the solidified secondary plug to restore the wellbore flowpath through the solidified secondary plug.

Disclosed herein is a workflow for evaluating the cement between a casing string and the surrounding formation in a wellbore and for determining casing string eccentricity using sector cement bond log (CBL) data. This method involved using a cement bond logging tool with an extended acquisition time window to capture multiple interface echoes. From this sector CBL data, a data matrix of waveform information is generated, with each row representing waveform data from different azimuthal sectors. Through singular value decomposition, the principal components of the matrix are identified. Subsequent component analysis emphasizes significant components of waveforms. The significant waveform components are then used to model waveforms using local cluster modeling. The method proceeds by analyzing decomposed data to pinpoint cement zones, compute an eccentricity index for casing deviation, and detect cement channels.

The utility model relates to the technical field of well completion and cementing equipment, in particular to a casing centralizer for an optical fiber cable well, and aims to solve the technical problems that in the prior art, due to the fact that the casing centralizer is limited by the fixed outer diameter of rigid design, the casing centralizer is difficult to adapt to different well diameters, and a pipe string is difficult to put down or the centering degree of the casing string is low. The casing centralizer comprises a ring seat assembly and a ball cage made of an elastic material, wherein the ring seat assembly is provided with an optical fiber cable fixing hole. The ring seat assembly comprises a first ring seat and a second ring seat. The first ring base, the ball cage and the second ring base are arranged on the sleeve in a sleeving mode and are sequentially connected in the axis direction of the sleeve. According to the casing centralizer, the variable outer diameter capable of being elastically contracted is generated through the ball cage made of the elastic material, and the casing centralizer abuts against the well wall through elastic deformation of the ball cage so as to automatically adapt to well diameters of different sizes. The technical problems that due to the fact that an existing underground optical fiber cable fastening hoop is limited by the fixed outer diameter of rigid design, the existing underground optical fiber cable fastening hoop is difficult to adapt to different well diameters, and pipe string tripping-in is difficult or the centering degree of a casing pipe string is low are solved.

Disclosed is a rupture disc assembly for use in making a temporary seal in a vessel such as a casing string. The rupture disc assembly may include a rupture disc having a side surface that has a shallow angle taper inward towards a bottom surface of the rupture disc, and a mounting apparatus to support the rupture disc so that the rupture disc forms the temporary seal. When a disc working pressure is applied to a top surface of the rupture disc, engagement / force transmission between the rupture disc and the mounting apparatus produces enough radial compression in the rupture disc due to the shallow angle taper to significantly mitigate or cancel tensile stresses thereby avoiding the rupture disc from breaking. The rupture disc may be configured to break when the rupture disc is subjected to a disc working pressure that is greater than the disc rupture pressure, thereby removing the temporary seal. An axial abutment surface feature may be provided which is configured and operable to limit downward axial movement of the rupture disc relative to said disc support mechanism and thus be operable to restrict the amount of compression said tapered wall surface of said disc support mechanism can exert on said at least a portion of said rupture disc when the top surface of the rupture disc is subjected to said hydraulic pressure within the well.

The invention provides a casing well drilling well cementation-free tubular column and a construction method, the casing well drilling well cementation-free tubular column comprises a casing string, a drill bit is arranged at the lower end of the casing string, and the casing string replaces a drill rod to drive the drill bit to drill; the self-expansion packers are arranged in the axial direction of the casing string at intervals, can expand in the environment of an expanding agent and are fixed in the stratum; wherein the casing pipe string comprises a casing pipe without a coupling. By means of the self-adaptive expansion characteristic of the self-expansion packer, traditional cement well cementation is replaced, packing failure caused by cement performance fluctuation or casing welting is avoided, and the annulus sealing reliability is improved.

The invention discloses a wellhead device which comprises a tension four-way body and a tension casing hanger arranged in a main runner hole of the tension four-way body, and a casing string is connected to the bottom of the tension casing hanger. The tension four-way body is provided with at least two sets of tension mechanisms used for supporting a tension casing hanger and at least two sets of locking mechanisms used for locking the tension casing hanger. A locking groove and a bearing step face are sequentially arranged on the outer circle face of the tension sleeve hanger from top to bottom. The tension mechanism comprises a supporting seat installed on the side portion of the tension four-way body and a supporting rod movably arranged on the supporting seat, and the locking mechanism comprises a locking sleeve installed on the side portion of the tension four-way body and a locking rod movably arranged on the locking sleeve. After casing cement well cementation, the casing hanger is lifted upwards to enable a casing string to generate large axial tension, so that a casing does not vibrate and threads are not loosened when wellhead airflow is output, and the service life of the casing string and the wellhead is prolonged.

The invention discloses a resin well cementation method for a carbon dioxide injection well, which comprises the following steps of: calculating the annulus volume between a small-diameter casing string and an original well casing according to the specification parameters of the casing; a well killing hydraulic well is used, and after well killing is completed, the small-diameter casing string is lowered to the preset depth, and then a well mouth is installed; the method comprises the following steps: injecting a first solution into an annulus between a small-diameter casing string and an original well casing until well killing fluid in the annulus and the small-diameter casing is completely replaced by the first solution; after well killing fluid replacement is completed, a second solution with the same volume as the annulus volume is injected into the small-diameter casing string, the density of the second solution and the density of the first solution are close and both smaller than the density of the well killing fluid, the second solution and the first solution are different in color, and a high-strength carbon dioxide corrosion resistant resin slug is injected into the annulus pump; the technical problem of resin well cementation in the overflow state of the carbon dioxide injection well is solved.

The invention relates to the technical field of petroleum drilling equipment, in particular to a novel eccentric rotating casing guiding shoe and a using method thereof. The eccentric rotating sleeve guide shoe comprises a lower shell, the top of the lower shell is rotationally connected with an upper shell, the bottom of the lower shell is connected with a telescopic sleeve, the bottom of the telescopic sleeve is connected with an eccentric guide head, a plurality of spiral guide strips are arranged on the circumference of the outer side wall of the lower shell at equal intervals, and the inner side wall of the lower shell is connected with a first turbine. The telescopic sleeve comprises an outer cylinder coaxially connected with the lower shell, an inner cylinder coaxially connected with the eccentric guide head and a spring respectively connected with the outer cylinder and the inner cylinder, and a plurality of spiral blades with downward tips and extending towards the eccentric guide head are arranged on the circumference of the outer side wall of the outer cylinder at equal intervals. The reaming efficiency is high, the labor intensity of workers can be reduced, and it can be fully guaranteed that the casing pipe string is smoothly lowered to the preset position.

A system includes a packer sealed against a casing string deployed in the well, production tubing extending through the packer and configured to transport the production fluids to a surface location, and an electric submersible pump connected to the production tubing at a location downhole from the packer. The electric submersible pump is configured to pump the production fluids through the production tubing. The system further comprises a gas activated vent valve installed on the production tubing at a location downhole from the packer and configured to open using a pressure exerted on the gas activated vent valve by the gas and a vent line connected to an outlet of the gas activated vent valve, extending through the packer, and configured to transport the gas from the gas activated vent valve to the surface location when the gas activated vent valve is opened by the gas.

The present disclosure relates to a method and a flow control device for in-situ recovery ('ISR') of metals from an orebody. The method comprises drilling at least one vertical parent well into a formation comprising the orebody, and subsequently, drilling a plurality of lateral wells for performing a blasting operation to create a fractured rock silo within the formation. Next, an ISR drilling operation is carried out within the fractured rock silo by drilling further wells, including injection and production wells. Carrying out an ISR process, where casing strings comprising the flow control device is run into the injection and production wells, where the casing strings within injection wells are for injecting a fluid into each ISR well to dissolve the metal therein, and subsequently collecting a pregnant solution, comprising the dissolved metal, from the orebody via the production well and the casing strings therein.

A system and method for determining the location of a droppable object in a wellbore. The droppable object includes an integrated locating system that detects completion components as the object moves through a casing string. The locating system includes an actuation device that is activated based on detection of the components. When activated, the actuation device exerts a radially directed frictional pressure against the inner wall of the casing string, thereby generating pressure pulse telemetry signals that are detected and analyzed by surface equipment to determine the object's downhole location.

The present application belongs to the technical field of downhole key tools for oil and gas drilling and fracturing, and particularly relates to a casing temporary sealing tool and a temporary sealing method. The casing temporary sealing tool is used for plugging inside a casing string, and comprises a tool mandrel, a center shaft, a sealing structure, a push block, a locking rod, a connecting shaft, a clamping arm structure, a releasing sub and a gapless ring. The center shaft is pushed, and the sawtooth-shaped protrusions on the outer surface of the push block form a first-stage positioning with the casing string, and the sealing structure forms a seal with the casing string. The outer surface of the connecting shaft is provided with the clamping arm structure, and the clamping arm structure cooperates with a groove arranged in the casing string to realize second-stage positioning. The structure of the present application can realize sealing of the casing through cooperation of the sealing structure, the push block and the clamping arm structure. Through the push block and the clamping arm structure, twice positioning and setting are realized, the temporary sealing tool is prevented from slipping and moving, and better setting effect is achieved.

The invention provides a system and computer program for identifying the depth of leaks in well casing strings after receiving temperature-depth data from a thermally conditioned well. Upon receiving the data, the system calculates moving average temperature gradients over a specified length of the casing. It then computes the mean and standard deviation of these gradients to determine a lower control limit (LCL) using a predefined formula. The system identifies leak depths by locating gradients below the LCL. The computer program generates control charts, visual alerts, and detailed reports to facilitate leak detection, offering a streamlined and effective approach to well integrity assessment.

A sliding sleeve valve assembly with a fluid bypass for use in a wellbore. When a downhole section of the casing string is isolated from an uphole section by setting an isolation element in the valve assembly, the fluid bypass can allow allow for the release of hydraulic pressure from the downhole section. The fluid bypass can be open by default, can be opened by exceeding a burst disc rating, or can be opened by shifting the sliding sleeve to the open position. The fluid bypass can provide fluid communication between the downhole section and the uphole section, or between the downhole section and the wellbore annulus. The fluid bypass may be formed by a path that circumvents sealing within the annulus between the sleeve and the housing, or the fluid bypass may be formed by defeating sealing within the annulus between the sleeve and the housing.

The invention relates to the technical field of oil well casing pipe column systems, and provides an anti-corrosion oil well casing pipe column system which is designed and installed to form a first sacrificial anode bent rod and a second sacrificial anode bent rod of a sacrificial anode protector function and is used for solving the problem of local corrosion of a casing pipe. Maintenance and replacement of a first sacrificial anode bent rod and a second sacrificial anode bent rod can be achieved, the anti-corrosion period of an oil well casing pipe column system is prolonged, practicability is better, the service cycle is longer, and the device comprises a main body pipe, an outer connecting pipe sleeve and an inner connecting pipe sleeve. The outer connecting pipe sleeve is fixedly connected to the top end of the main body pipe, internal threads and external threads are arranged in the outer connecting pipe sleeve and outside the inner connecting pipe sleeve respectively, a follow-up sleeving part is installed outside the outer connecting pipe sleeve, a first side through hole and a second side through hole are formed in the main body pipe, a first step pipe is fixedly connected in the first side through hole, and a second step pipe is fixedly connected in the second side through hole. And a second stepped pipe is fixedly connected in the second side through hole.

Methods for using perforating tools and downhole wellbore isolation devices in various combinations and configurations in order to perform downhole perforating and cementing operations. Perforating is performed using at least one mechanical perforating device. Cementing operations can include block squeeze jobs (wherein the casing is selectively perforated and cement slurry is pumped through said perforations) or cement spotting jobs (wherein a predetermined volume of cement is deposited in the inner bore of a casing string to act as a “plug”).

A remotely operable Wellbore Integrity System for large scale monitoring of annular pressure on production wells. The system enhances the integrity of annular casing strings associated with mineral wellbores. The system can be autonomously deployed and has programmable pressure relief valves enabling remote adjustment of the casing pressure.

The utility model discloses a composite material casing pipe lifted and restrained by a lifting rope, which relates to the technical field of oil and gas drilling and comprises composite material pipes, the composite material pipes are quickly connected through quick connectors, and the outer side wall of each composite material pipe is provided with an integrally formed annular support; the lifting ropes can be lifting chains or steel wire ropes, the multiple lifting ropes are annularly distributed on the outer side of the composite material pipe, and the two ends of each lifting rope are connected between every two adjacent quick connecting joints in a tensioning mode; in the well, the lifting ropes are in a tensioned state and bear the hanging load of the casing string, and the composite pipe is restrained within the range defined by the lifting ropes through the multiple lifting ropes; the length of the lifting rope in a tensioned state is elaborately designed, so that the composite material pipe is prevented from being pulled; the plurality of lifting ropes in a tightened state serve as reinforcing steel bars, so that the well cementation quality can be improved; the composite casing pipe is convenient to connect, resistant to corrosion, low in cost and capable of remarkably reducing the well cementation cost.

A system includes an equipment platform, an electro-magnetic defectoscopy tool, a signal emitter, a signal receiver, and a computer processor. The equipment platform is formed in a ring-like shape having an orifice of a size large enough to fit a circumference of the wellhead or the casing string within the orifice. The electro-magnetic defectoscopy tool is mounted to the equipment platform. The signal emitter is located in the electro-magnetic defectoscopy tool and is configured to emit a signal towards the orifice of the equipment platform. The signal receiver is located in the electro-magnetic defectoscopy tool and is configured to receive a reflected signal from the wellhead or the casing string. The computer processor is electronically connected to the signal receiver and is configured to receive and use the reflected signal to determine a condition of the wellhead or the casing string.

An apparatus for use in the oil and gas industry for installation of drilling and production liners and sub-sea casing strings into a borehole through a drilling fluid on a workstring using a running tool with the benefits of surge pressure reduction is disclosed. In an embodiment, a convertible diverter device has a housing with diverting flow path which diverts fluid from its axial passageway to the annular space outside the convertible diverter device, and a closing sleeve, residing within the housing, the closing sleeve having a diverting position and a closed position. In the diverting position, the diverting flow path is not blocked by the closing sleeve, and in the closed position the closing sleeve sealingly blocks the diverting flow path, so only the axial passageway through the housing is accessible for passage of fluid and tools. The closing sleeve is shifted by use of a frangible activation seat, in combination with an activation plug, whereby the frangible activation seat is pulverized after the closing sleeve converts to the closed position. Thereby, the axial passageway is left with an effective internal diameter that may be equal to the internal diameter of the closing sleeve, which may ensure safe passage of fluids and cementing plugs through the converted diverter during casing cementing operations.

A system for designing a casing string for a well. The system comprises a processor, a non-transitory memory, a thermodynamic modeling application stored in the non-transitory memory that, when executed by the processor, models carbon dioxide (CO2) material in the well using a carbon dioxide equation of state (EoS) to determine thermodynamic properties of the CO2 material, and a downhole environment modeling application stored in the non-transitory memory that, when executed by the processor determines temperatures of and pressures at well components at each of a plurality of points of a casing string design based in part on the thermodynamic properties of the CO2 material determined by the thermodynamic modeling application, and provides the temperatures of well components and pressures in the casing string at each of the plurality of points of the casing string to a casing string strength analysis application executing on the computer system.

The invention relates to the technical field of petroleum well completion, in particular to a rolling belt type casing centralizer and a using method. According to the technical scheme, an inner cavity of a centralizer body is a centralizer inner flow channel, multiple sets of rolling belt installation grooves and multiple sets of circulating flow channel grooves are evenly distributed in the outer wall of the centralizer body in the axial direction, a rolling belt circulating block assembly is installed in each rolling belt installation groove, and the rolling belt circulating flow channel grooves are in surface contact with the well wall through the rolling belt circulating block assemblies; and one side of each rolling belt mounting groove is provided with a circulating flow channel groove for liquid to flow up and down when the casing is lifted and lowered. The casing centralizer has the beneficial effects that rolling surface contact is formed through the rolling belt of the annular structure and the well wall, on one hand, the casing centralizing effect is well achieved, on the other hand, damage to a supporting covering film of the soft rock stratum well wall is reduced, and the problem of well wall collapse is avoided; and by arranging the circulating flow channel groove, safety accidents such as induced blowout or blowout caused by up-and-down movement of the casing pipe string can be avoided.

The invention belongs to the technical field of oil and gas exploitation, and particularly relates to a screen pipe, a well entering method, a well washing method and a well completion method. The screen pipe comprises a center pipe, a filter layer and a protection pipe which are sequentially arranged from inside to outside in a sleeved mode, a plurality of through holes are formed in the center pipe, and plugs made of soluble materials are fixed in the through holes in a sealed mode. The screen pipe provided by the invention can enter a well by adopting a floating casing running process, so that the friction resistance is reduced, and the screen pipe can be smoothly run in place.

Methods and systems are disclosed herein. A method may include operating a closed-loop geothermal system (100) disposed in a well (101). The well (101) includes a wellbore (102) penetrating the geothermal heat source (104), a casing string (120), a control valve (125), and a temperature sensor (127). An annulus (107) is formed between the closed-loop geothermal system (100) and the casing string (120). The method includes measuring, using the temperature sensor (127) a first temperature of the geothermal fluid. The method includes opening, when the first temperature is lower than a first predetermined temperature, the control valve (125) in order to discharge geothermal fluid from the annulus (107).

The application discloses a long-acting anchoring tool and method, which comprises an outer protection mechanism, an inner protection mechanism, a well washing mechanism and an anchoring mechanism, wherein the outer protection mechanism comprises a connecting sleeve, a protection cylinder, a sealing sleeve and a starting piston; the inner protection mechanism comprises a pressure transmission piston, an outer cylinder and a lower central pipe, and protection liquid is placed in the inner protection mechanism; the well washing mechanism comprises a well washing sleeve, a well washing spring, an upper piston, a lower piston and a sealing element; and the anchoring mechanism comprises a main body, a spring, an anchor claw and a pressing sheet. The application can effectively improve the service life of the anchoring tool and the reliability of recovery, further reduce the risk of later inspection and replacement, prolong the service life of a matched pipe column, and has important significance for further improving fine separate injection levels of water injection development in old oil fields.