49results about How to "Reduced risk of stuck pipe" patented technology

The invention discloses a pulsating two-way impactor. The pulsating two-way impactor comprises a shell power mechanism and an impact mechanism, wherein the impact mechanism includes a coupling, a central shaft, a spring, a sliding sleeve and an impact valve, and the central shaft There is a radial bypass hole connected with the upper and lower annular grooves built in the housing. The lower part of the central shaft forms an axial sliding fit connection with the impact valve through a spline group. The impact valve and the spring above it are arranged in the lower annular groove of the housing. Inside, the sliding sleeve is arranged on the impact valve, and the lower end of the impact valve forms an impact fit with the inner convex edge of the lower annular groove of the housing. The pulsating two-way impactor can simultaneously produce the dual effects of axial impact and torsional impact. The combination of axial impact and torsional impact can not only induce axial vibration of the drill string, reduce frictional resistance during sliding drilling, reduce the risk of drill sticking due to differential pressure, and increase The pressure on bit can weaken the impact of decompression, and can increase the instantaneous cutting force of the drill bit to prevent stick-slip vibration. It also has the advantages of simple structure, convenient operation, convenient installation, safety and reliability.

The invention relates to a method and special tool for sand flushing, and belongs to the technical field of well repairing work. The method and special tool for sand flushing are suitable for sand flushing construction of a pitshaft of an oil-gas well. The special tool for sand flushing comprises an outer pipe and a sand flushing inner pipe. The outer pipe is formed by sequentially connecting an oil pipe, a suspension pup joint and a rotary outer cylinder in a threaded mode. The sand flushing inner pipe is formed by sequentially connecting a sealing pup joint, a flushing pipe, a rotary inner cylinder and a drill bit in a threaded mode. According to the method and special tool for sand flushing, the annular space between the flushing pipe and the outer pipe is sealed through the sealing pup joint, a sand flushing fluid circulating channel between the outer pipe and the sand flushing inner pipe is established, and direct-circulating and reverse-circulating sand flushing construction in the sliding state of the flushing pipe is achieved; and rotating power for matching between the outer pipe and the ground is transmitted through the rotary inner cylinder and the rotary outer cylinder, the sand flushing drill bit is driven to rotate, and thus the rotary-drilling sand flushing construction requirement under a complex well condition is met.

The invention provides a horizontal well rapid water exploration method. A screwed plug is connected with a Y211 packer, the upper end of the Y211 packer is connected with a screen pipe, and the upper end of the screen pipe is connected with an oil pipe. The upper end of the oil pipe is connected with an oil-well pump. According to the golden section principle, horizontal well packer setting position layouts with different spraying point numbers are established, and the setting position of the Y211 packer is determined from the layouts. According to the water containing fluctuation judgment rules, the pumping and sucking results are diagnosed, the spraying point water breakthrough possibility of the upper end or the lower end of the Y211 packer is excluded, and the like, the suspected water breakthrough spraying point range is decreased step by step till the water breakthrough spraying points are determined finally. According to the horizontal well rapid water exploration method, through upward lifting and downward putting for setting and unsetting, airtightness is good; the pumping and sucking liquid quantity of every time is the liquid quantity of the spraying points of the upper portion of the packer, and the problem that in single-section testing, the low liquid quantity is large in water containing fluctuation and difficult in dereferencing is solved; a down-hole testing pipe string structure is simple, reliable in overall performance, low in cost and small in drilling jamming risk; and the diagnosis method is scientific and reasonable, section-by-section testing is not needed, the water exploration speed is high, the period is short, and the cost is low.

The invention relates to a rotary type hydraulic jet cutting sleeve tool and a construction method thereof. The rotary type hydraulic jet cutting sleeve tool comprises an upper joint (1), a rotary sleeve (5), an outer sleeve (7) and a rotary head (9); one end of the upper joint (1) is connected with an oil pipe (18), the other end of the upper joint (1) is sleeved with the rotary sleeve (5) and inserted into the outer sleeve (7), the rotary sleeve (5) penetrates through the outer sleeve (7) and is inserted into the rotary head (9), the rotary sleeve (5) is connected with the outer sleeve (7) through a bearing, and the rotary sleeve (5) and the rotary head (9) are fixedly connected through screws. According to the rotary type hydraulic jet cutting sleeve tool, the sand-carrying liquid withdifferent pressure and displacement is injected into a well mouth, the rotary head of the hydraulic cutting sleeve tool is driven to rotate so as to complete operation of the hydraulic cutting sleeveand the well cementation cement ring, and the rotary type hydraulic jet cutting sleeve tool has the advantages of being high in hydraulic cutting efficiency, small in chip particle size, easy to return, small in drilling risk, free of application of drilling pressure and the like.

The invention provides a method for preparing elastic graphite. The preparation method includes the following steps: using petroleum coke and petroleum pitch as raw materials, crushing the raw materials, mixing and kneading them and molding them at one time; crushing the raw materials after molding them at one time, and adding them to facilitate kneading The secondary molding is completed after the auxiliary materials are used; high-temperature graphitization roasting is carried out at a temperature of 1900°C-2700°C; the elastic graphite raw material is obtained after crushing and screening; the elastic graphite raw material is added to the mixer for mixing, and the fineness is qualified. Package. The advantages and positive effects of the present invention are: the elastic graphite prepared by the present invention is used to prevent the leakage of porous and fractured formations in water-based or oil-based mud systems, and to help seal porous and wide-cracked formations for water Or oil-based mud leak-proof design.

The invention discloses an oil well pipe cleaning and sand flushing integrated device. The device comprises a shunt nipple, a shunt packer, a double-layer pipe body, a pipe scraper and a sand flushing nipple which are mutually communicated and are each of a double-layer pipe structure; the pipe cleaning and sand flushing method comprises the steps that the pipe scraper is opened, the shunt packer is recovered, the device is placed down in an oil well casing, a well cleaning fluid is injected into casing annulus, and pipe cleaning and well cleaning are completed; after the sand surface position is determined, the pipe scraper is recovered, and the shunt packer is subjected to setting; a sand cleaning fluid is injected into the casing annulus, and the bottom of a well is flushed through positive pressure sand flushing or negative pressure sand flushing; finally, the shunt packer is upset, and pulling out of the hole is conducted. According to the oil well pipe cleaning and sand flushing integrated device, pipe cleaning and sand flushing operation can be achieved at a time, for formation leakage, both positive pressure sand flushing and negative pressure sand flushing can be conducted, the risk of sticking operation is reduced, the pipe cleaning and sand flushing operation efficiency is improved, the well-completion operation cycle is shortened, and the well-completion operation cost is reduced.

The present invention discloses a device and a method for a releasing capability test of a K344 packer under a condition of repeat reconstruction of a horizontal well. The test device comprises a plugwith a pull ring, a test oil tube, an oil tube striking hole, a simulation sleeve, a first plug, a spacing ring, a piston, an annular striking hole, an orifice, a K344 packer, an explosion liquid exit channel and a second plug. The plug with the pull ring is connected with the test oil tube, and the oil tube striking hole, the orifice and the explosion liquid exit channel are arranged on the testoil tube; the spacing ring is arranged at the inner side of the simulation sleeve; the first plug is provided with an oil tube fixing device and fitting screws; and the piston can transversely move,and contact surfaces of an inner wall and an outer wall are sealed by employing seal rings. The test method provided by the invention can simulate a releasing capability of the K344 packer when upperand lower ends of a rubber sheet of the K344 packer have a large differential pressure after repeat reconstruction of a horizontal well, the test device is simple in structure and low in cost, and a test result is reliable.