67 results about "Casing string" patented technology

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.

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 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.

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 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.

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”).

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.

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 application provides a self-unblocking drillable floating collar, relates to the technical field of drilling, and is used for full-bore floating casing operation. The floating collar is installed at the bottom of a casing string, realizes the sealing of the bottom of an air section of the floating casing, and prevents the fluid in a well from entering the casing. After the casing is lowered into a designated position in the well, the well mouth is pressed to break the rupture disc, the broken pieces of the rupture disc enter the outer cylinder along with the drilling fluid, the small broken disc pieces normally pass through the filter screen, the large broken disc pieces are concentrated on the bearing screw, the drilling fluid and the small broken disc pieces impact the valve core head, the elastic assembly is in a compressed state, a gap is formed between the valve core head and the valve seat to form a flow channel, the drilling fluid and the small broken disc pieces flow along the flow channel, and when the pump is stopped, the large broken disc pieces slide onto the inner wall of the outer cylinder under the action of gravity, and the floating collar is self-unblocked.

An expandable liner hanger assembly is disclosed that may include a liner hanger body having a radially expandable tubing. The expandable liner hanger assembly may also include a groove formed in a radially outer surface of the liner hanger body, the groove configured to extend circumferentially around the liner hanger body. In addition, the expandable liner hanger assembly may include at least one anchor key having a base portion disposed within the groove. Further, an engagement end of the at least one anchor key may extend radially outward from the groove. The engagement end is configured to engage a casing string to anchor into the casing string in response to expansion of the drilling liner hanger body.

A plug deployable into a wellbore having a casing string includes a sealing element including an outer sealing surface configured to extend outwardly from a central axis of the plug and sealingly press against a casing string when the plug is in the second configuration, and a slip including at least one slip body having a peripheral outer face oriented to face away from the central axis and towards the casing string, and one or more engagement members located on the outer face of the slip body wherein the one or more engagement members are configured to bite into the casing string when the plug is in the second configuration, wherein at least 40% of a total volume of the plug is formed from corrosion-selected materials and at least 30% of the total volume of the plug is formed from corrosion-resistant materials.

Techniques for implementing and / or operating a well system including a rotatable casing hanger and a rotatable running tool. The rotatable casing hanger includes a hanger body, which is to be secured to a casing string; a hanger sleeve secured circumferentially around the hanger body, in which the hanger sleeve is to be landed on another wellhead component; and a hanger bearing assembly disposed axially between the hanger body and the hanger sleeve. The rotatable running tool includes a tool body that defines a tool bore, in which the tool body is to be selectively secured to the hanger body; a tool sleeve secured circumferentially around the tool body to facilitate maintaining centralization of the tool body and, thus, the rotatable casing hanger; and a tool bearing assembly disposed between the tool body and the tool sleeve. 44805447 20 24 22 01 65 27 S ep 2 02 4 A B S T R A C T 2 0 2 4 2 2 0 1 6 5 2 7 2 0 2 4 S e p 4 4 8 0 5 4 4 7 4 / 14 10D M 54 56 12D 60 60 20 15D 42 40 20C 38C 34B 14D FIG. 4 20 24 22 01 65 27 S ep 2 02 4 1 5 D 6 0 5 6 3 4 B 1 4 D 1 2 D 6 0 2 0 4 2 4 0 2 0 C 3 8 C 2 0 2 4 2 2 0 1 6 5 2 7 S e p 2 0 2 4

A plug deployable into a wellbore having a casing string includes a sealing element including an outer sealing surface configured to extend outwardly from a central axis of the plug and sealingly press against a casing string when the plug is in the second configuration, and a slip including at least one slip body having a peripheral outer face oriented to face away from the central axis and towards the casing string, and one or more engagement members located on the outer face of the slip body wherein the one or more engagement members are configured to bite into the casing string when the plug is in the second configuration, wherein at least 40% of a total volume of the plug is formed from corrosion-selected materials and at least 30% of the total volume of the plug is formed from corrosion-resistant materials.

A mechanical dynamic response and safety evaluation method for a corroded oil casing in the gas lift process of an ultra-deep well is characterized in that gas lift transient multiphase flow shaft pressure dynamic response simulation under four working conditions including the moment of valve opening, the moment of gas lift, the moment of valve closing when accumulated liquid is not drained completely and the moment of valve closing when the accumulated liquid is drained completely is carried out; the method comprises the following steps: determining risk point positions, risk working conditions and dynamic pressure distribution rules of an oil casing string, constructing different gas lift parameters, namely maximum pressure charts in an oil casing annulus and an oil pipe, and constructing a three-dimensional mechanical model of a corroded oil casing based on the pressure distribution rules and the risk point positions of the string in a shaft under the risk working conditions; oil casing mechanical behavior simulation under different simulation loads and corrosion depths is carried out, a safety coefficient-oil casing annulus maximum pressure and oil pipe internal maximum pressure chart is constructed by adopting a safety coefficient method, a dynamic pressure and corrosion coupling risk evaluation method is formed, and a basis is provided for ultra-deep well gas lift process optimization and pipe column risk evaluation. The method is suitable for the technical field of natural gas extraction.

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 invention discloses a constant-speed lowering device and method for a through large-diameter vertical hole casing for an underground coal mine. The device mainly comprises hoisting anchor cables circumferentially and uniformly distributed on a top plate of an orifice, an orifice anti-falling device mounted on a bottom plate, a guide head and a multi-strand steel wire rope traction system which are connected with a casing string, and a plurality of independently suspended chain blocks. According to the method, a plurality of chain blocks are manually and synchronously operated to achieve controllable constant-speed lowering of a casing pipe, alternate holding and loosening of an orifice safety slip are utilized, an original segmented traction point resetting step is combined, and operation is cyclically conducted till the target depth is reached. According to the scheme, the technical problems that an underground large-diameter deep hole casing pipe is prone to deflection and difficult to move at a constant speed in the lowering process, and the falling risk exists are effectively solved, and the device has the outstanding advantages of being high in safety, good in stability, controllable in operation, high in adaptability and the like.

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 invention relates to the technical field of casing heads, and discloses an oil field wellhead leakproof casing head which comprises a base, a casing head body, a slip, a slip bowl and a leakproof mechanism, the casing head body is arranged on the base, the slip bowl is arranged in the casing head body, the slip is arranged in the slip bowl, the lower portion of the outer circumferential surface of the slip is a conical surface, and the lower portion of the outer circumferential surface of the slip is a conical surface. The upper portion of the inner wall of the slip bowl is an inner conical surface, the conical surface is connected with the inner conical surface in a matched mode, and the anti-leakage mechanism is arranged on the slip bowl and locks the slip when the slip bears upward pressure in a well. According to the anti-leakage casing head for the wellhead of the oil field, the anti-leakage mechanism is arranged on the slip bowl, and when the pressure between an underground casing string and a surface casing is increased and the lower end of the slip is subjected to upward pressure, the anti-leakage mechanism is started to lock the slip and the slip bowl, so that upward micro displacement of the slip is prevented; the sealing between the slip and the slip seat is failed, and the safety of a wellhead is protected.

An x-ray based cement evaluation tool for measurement of the density of material volumes within single, dual and multiple-casing wellbore environments is provided, the tool including at least an internal length comprising a sonde section, wherein said sonde section further comprises an x-ray source; a radiation shield for radiation measuring detectors; sonde-dependent electronics; and a plurality of tool logic electronics and PSUs, wherein the tool uses x-rays to illuminate the formation surrounding a borehole and a plurality of detectors are used to directly measure the density of the cement annuli and any variations in density within. Detectors used to measure casing standoff such that other detector responses are compensated for tool stand-off and centralization; a plurality of reference detectors is used to monitor the output of the x-ray source, and a shortest-axial offset detector is configured to distribute incoming photons into energy classifications such that photoelectric measurements may be made.

The application provides an in-situ leaching uranium mining process well structure and an implementation method thereof, and relates to the field of in-situ leaching uranium mining.The structure comprises a casing string, the casing string comprising a casing, a filter pipe and a sand setting pipe, the bottom of the sand setting pipe being provided with a first flow-through hole, a grouting cavity being formed in a wellhead when the casing string is used to be arranged in the inside of the wellhead; a subsidy casing, the subsidy casing being fixedly connected to the inner wall surface of the filter pipe, the bottom of the subsidy casing being flush with the bottom of the filter pipe, the top of the subsidy casing being higher than the top of the filter pipe, and a plurality of second flow-through holes being arranged at the top of the subsidy casing, the plurality of second flow-through holes being communicated with the grouting cavity and the first flow-through hole; and a cement slurry detection device, the cement slurry detection device being used to feed back the density value of the overflowed cement slurry at the second flow-through hole.The application can conveniently and accurately position the ore layer section, can reduce the invalid dilution of the leaching agent or the leaching liquid, and can realize the efficient mining of the uranium mine.

This invention relates to an apparatus and process for extracting deep-sea combustible ice using a decompression method, belonging to the field of marine oil and gas resource extraction technology. Its key technical points are: it consists of an extraction platform, wellhead equipment, casing string, production string, downhole desanding system, monitoring system, underwater delivery pipeline, and umbilical cable; employing three-stage sand prevention and two-stage desanding measures, it can effectively prevent and remove sand to ensure stable extraction of combustible ice. Two gas-liquid separators are installed on the production string, namely a string cyclone gas-liquid separator and a packed gas-liquid separator, thereby achieving efficient gas-liquid separation within the well and ensuring more thorough gas-liquid separation. An electric submersible pump is placed below the extraction layer to ensure rapid gas entry into the production string, providing a reliable guarantee for pump intake water and avoiding pump cavitation and idling. The heat generated by the electric submersible pump motor is used to heat the production water to prevent hydrate formation.

A casing string assembly for deployment in a wellbore includes a shoe track provided at a lower end of a casing string that provides a flow path, an annular isolation apparatus arranged uphole from the shoe track and including a radial sealing member operable to expand radially and form a seal within an annulus defined between the casing string and an inner wall of the wellbore, a communication tool and including at least one port that facilitates fluid communication between the flow path and the annulus, the port being selectively opened and closed to permit and restrict fluid flow therethrough, and a first isolation device operable to form a seal within the flow path and thereby isolate the shoe track from the annular isolation apparatus and the communication tool, the first isolation device including a bypass mechanism selectively operable to permit fluid flow through the first isolation device.

The invention discloses a method and system for monitoring the bending degree and the sealing performance of a casing string in an adjacent horizontal well, and relates to the technical field of drilling and completion engineering design and construction.The method comprises the steps that A, a well group is selected; b, a strong magnetic centralizer is put into each completed well for well cementation; c, the magnetic force line distribution condition in the adjacent well-completed straight well sections is obtained through the while-drilling magnetic detection type drilling tool, and position data of the strong magnetic centralizers are calculated; d, the bending degree of the casing strings in the adjacent well-completed straight well sections is calculated, and the sealing performance of the casing strings in the adjacent well-completed straight well sections is judged; e, the step C and the step D are repeated, the bending degree of the casing strings in the adjacent well-completed inclined shaft sections and the horizontal sections is calculated, and the sealing performance of the casing strings in the adjacent well-completed inclined shaft sections and the horizontal sections is judged; and F, the overall bending degree and the overall sealing performance of the casing string in each completed well are comprehensively obtained. The technical problem that the bending degree and the sealing performance of the casing string cannot be effectively monitored is solved.

An improved casing cutter apparatus and method of use are provided for cutting one or more casing strings positioned within a subterranean wellbore during the ‘cut-and-cap’ stage of the wellbore abandonment process. In some embodiments, the apparatus may comprise a cutting attachment operably coupled to at least one mobile power source located at or near the surface of the wellbore.

The application provides a full-bore fracturing sliding sleeve, which comprises an outer cylinder, an upper joint and a lower joint connected to two ends of the outer cylinder respectively, an inner cylinder arranged concentrically in the outer cylinder, the inner cylinder being fixed to the outer cylinder through a first shear pin, and a lower sleeve arranged at a lower end of the inner cylinder, the lower sleeve being fixed to the inner cylinder through a second shear pin, wherein the shear critical value of the second shear pin is greater than that of the first shear pin, the inner cylinder can cooperate with a running tool through the running tool, and the inner cylinder can be driven to shear the first shear pin under the action of pressure difference and then move downward until the lower sleeve is seated on an upper end surface of the lower joint to open the flow passage, the inner cylinder can continue to move downward after shearing the second shear pin under the action of pressure, and the running tool is retracted to pass through the full-bore fracturing sliding sleeve. The application further provides a pipe string and a working method of the full-bore fracturing sliding sleeve.

The invention relates to the technical field of oil and gas field intelligent well completion system tools, and discloses a navigation plug and sliding sleeve system for horizontal well navigation positioning fracturing, which comprises a navigation plug, a plurality of fracturing movable sliding sleeves and a plurality of fracturing fixed sliding sleeves, each of the fracturing movable sliding sleeve and the fracturing fixed sliding sleeve comprises an outer cylinder and a sliding sleeve piston cylinder which is releasably fixed on the outer cylinder through a shear pin, and the sliding sleeve piston cylinders seal sand blasting holes in the outer cylinders in an initial state; the fracturing fixed sliding sleeve further comprises a fixed sliding sleeve step ring. The navigation plug comprises a main body framework, a navigation plug piston cylinder, a rubber cylinder and a control module. The invention aims to solve the technical problems that in the existing horizontal well staged fracturing technology, the fracturing stage number is limited by a mechanical structure, intelligent accurate positioning is lacked, continuous opening of multi-stage fracturing layer sections through one-time delivery cannot be achieved, the operation efficiency is low, and the construction period is long.