246 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 relates to the technical field of petroleum drilling, in particular to an internally-throwing ball type whipstock for petroleum drilling and a using method.The internally-throwing ball type whipstock for petroleum drilling comprises a whipstock body, the bottom of the whipstock body is connected with an anchoring pipe column, the bottom of the anchoring pipe column is connected with a sealing and pressing pipe column, and the bottom of the sealing and pressing pipe column is connected with a sealing and pressing device. The bottom of the pressure sealing tubular column is connected with a liquid injection connector or a packer. The pressure sealing ball is internally designed in the pressure sealing tubular column, the wireless gyroscope and the pressure sealing ball can be tripped into a well along with the whole set of tubular column, the working steps are simplified, the working efficiency is improved, and the working time and the working cost are reduced by avoiding the tedious lowering and lifting process of a wired gyroscope.

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 method includes drilling a wellbore into a subsurface using a drill bit and, for each of a plurality of depths of the drill bit in the wellbore, detecting, at each of a plurality of receiver stations located along a fiber optic cable disposed behind a casing string within the wellbore, a seismic signal created by the drill bit drilling the wellbore, sending an optical signal generated by the detection of the seismic signal from each of the plurality of receiver stations to an interrogator, sorting, using a computer processor, the optical signals by receiver station, and determining, using the computer processor, a seismic velocity using first breaks picked from the sorted optical signals.

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.

The invention provides a rubber plug testing device and a testing method.The rubber plug testing device comprises a testing sleeve, a sealing plate and a first rubber plug short section, a rubber plug is arranged in the first rubber plug short section, and the first rubber plug short section is arranged at the first end of the testing sleeve and connected with the testing sleeve in a sealed mode; the first side portion of the sealing plate is sealed with the end face, away from the test sleeve, of the first rubber plug short section, and displacement liquid can enter the first rubber plug short section through the sealing plate and drive the rubber plug to move in the test sleeve in the axis direction of the rubber plug. According to the invention, the wear state and the sealing state of the rubber plug in a long-distance moving process in a casing string can be truly simulated, and guidance is provided for evaluating the sealing performance and the wear degree of the rubber plug used in an actual well completion construction process.

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.

Disclosed herein are systems and methods of determining cement integrity behind a casing string using acoustic signals in the field of well drilling and completions. Specifically, the systems and methods evaluate the interface between cement and formation and / or cement-second casing and determine the thickness of the cement. Data are processed to determine annular compression wave velocities in a cased well using a semblance method or by stacking the amplitude of the leaked A0 mode energy that has reflected from the cement-formation or cement-second casing interface. The annular compression wave velocity is necessary to convert time domain images of the annulus into radial distance domain images for better interpretation of annular conditions. A semblance method is used to determine a velocity estimate for the annulus and annular thickness. The semblance method is used for all depths and azimuths to create detailed radial distance domain images of the annulus in cased wells.

The invention belongs to the technical field of gas well drilling and completion pipe evaluation, and particularly relates to a sleeve thread fatigue sealing evaluation test device and method under the simulated horizontal well environment. The device is organically composed of a large-size test tube, a connecting piece, a first plug, a test sleeve, a coupling, a sliding sleeve, a centralizing ring, a second plug, an electric pressure test pump, a first acting part, a second acting part and a third acting part. By means of the device and method, the tonnage and frequency data of safe lowering of the horizontal well casing can be obtained, the purpose of safe lowering of the casing on site is achieved, the risk of lowering sealing failure of the horizontal well casing is effectively reduced, and the repair cost of sealing failure of a casing string is greatly reduced.

The present invention relates to the technical field of drilling tools, specifically to a floating coupling device, including a coupling body; the coupling body is cylindrical with an installation cavity that is transparent from top to bottom, and a pressure differential sleeve is fixedly installed on the upper part of the installation cavity of the coupling body through a pin hole and a shear pin, and the pressure differential sleeve is cylindrical with a larger upper part and a smaller lower part. The present invention forms a temporary barrier in the casing, the casing column below the sliding circular plate is filled with air, and the casing column above the sliding circular plate is filled with drilling fluid, thereby increasing the buoyancy of the casing column below the sliding circular plate, so that the lower casing string is in a floating state during the casing lowering process. After the casing string reaches a predetermined position, the sliding sleeve and the sliding circular plate cut off the shear pin and move downward, so that the drilling fluid of the upper casing enters the lower casing, making it easier to lower the casing string, effectively reducing the resistance of the casing lowering, and improving the working efficiency of the casing lowering and the cementing quality.

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.

A method for detecting leaks in a casing involves running a fiber-optic distributed temperature sensing cable into a well casing to obtain at least one trace in real time. The method includes thermally conditioning the well by inert gas injection and utilizing a trace to calculate moving average temperature gradients at predetermined intervals, determine the mean and standard deviation of these gradients, and establish a lower control limit based on the mean and standard deviation. By identifying any moving average temperature gradient below the lower control limit, the method enables the determination of the depth associated with leaks in the casing.

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.

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 generally include (A) a rupture disc having a side surface having a shallow taper inward towards a bottom surface of the rupture disc (B) an actuating mechanism including (i) an outer sled having an inner supporting surface forming a taper complimentary to the shallow taper of the side surface, (ii) an inner sled disposed within the outer sled and having a support shoulder to support the bottom surface of the rupture disc and (iii) a securing mechanism and (C) a housing to house the rupture disc and actuating mechanism.

A wireless system for monitoring downhole parameters in a well, in which the walls are cased with metal tube string, comprises a downhole transceiver arrangement lowered into the well and a transceiver mounted on the wellhead. One input or output of the wellhead transceiver is connected to the metal structure of the wellhead, and the second input or output is connected to the grounding device. A downhole transceiver arrangement comprises a contact element for electrical contact with a casing string, downhole instrument module, downhole pumping equipment or tubing electrically isolated from the string of casing metal tubes using at least one centralizer. The downhole instrument module comprises a dielectric insert, measuring sensors, control devices, receiving and transmitting device, and is designed to receive or transmit a signal from or to a transceiver located on the wellhead. This ensures that the operating modes of wells are monitored and optimized.

The present invention relates to the technical field of cementing equipment, and is an integrated isolation type drilling-free cementing tool, comprising a housing, a sleeve, a rubber cylinder, a positioning mechanism, shear pins, and a vertically arranged center tube. The present invention has a reasonable and compact structure, and the center tube is lowered into a predetermined position in the well together with the casing string. After the first-level cementing collision pressure is completed, the casing continues to be pressurized. When the spacer moves downward to the set position, the positioning mechanism fixes the spacer and the housing together. At this time, the rubber cylinder expands outward, and the expanded outer diameter reaches the maximum value. When the pressure reaches the maximum pressure-bearing value of the bursting disc, the bursting disc ruptures, and the inside of the casing and the annulus form a circulation channel to perform the second-level cementing. The present invention can realize the expansion sealing of the rubber cylinder only through a sleeve, and the positioning mechanism can form a positioning effect on the sleeve, and the sleeve cannot move up and down. The inside and outside of the integrated isolation type drilling-free cementing tool are still two independent working systems, which will not be connected in series, greatly improving the success rate of the tool.

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.

Disclosed herein are systems and methods of determining cement integrity behind a casing string using acoustic signals in the field of well drilling and completions. Specifically, the systems and methods evaluate the interface between cement and formation and / or cement-second casing and determine the thickness of the cement. Data are processed to determine annular compression wave velocities in a cased well using a semblance method or by stacking the amplitude of the leaked A0 mode energy that has reflected from the cement-formation or cement-second casing interface. The annular compression wave velocity is necessary to convert time domain images of the annulus into radial distance domain images for better interpretation of annular conditions. A semblance method is used to determine a velocity estimate for the annulus and annular thickness. The semblance method is used for all depths and azimuths to create detailed radial distance domain images of the annulus in cased wells.