47results about How to "Avoid Downhole Accidents" patented technology

The invention discloses a deep hole pre-grouting top plate reinforcement method for a large-mining height working face under special geological conditions. By the method, the phenomenon that local inbreak accidents of a top plate of the large-mining height working face are easy to cause due to the special geological conditions can be avoided, and the problems of poor effect of the conventional cement grout advanced reinforcement of the special geological conditions and high cost of high-polymer shallow part grouting can be solved. The method comprises the following steps of: distributing three lines of drilled holes on a laneway's side from top to bottom in a crossed shape, adjusting the angles of all the drilled holes, and controlling the positions of end holes, so that the effect of multi-point multi-face effective distance reinforcement can be achieved; after each drilled hole is opened, inserting a 108 sleeve pipe into the drilled hole, and solidifying by using grout; when each hole is drilled forward 5 meters, grouting once; after initial setting, cleaning, and drilling the next section continuously, wherein during construction, a short circle is finished after the drilling depth reaches 5 meters; and after solidification, cleaning and continuously drilling until the hole depth reaches the designed depth. The method has the advantages of good reinforcement effect, reasonable parameter, simplicity in construction, low cost and safety and reliability, and is particularly suitable for reinforcing the large-mining height working face under the special geological conditions.

The invention provides a curable low-density leaking stoppage working fluid and a preparation method. The curable low-density leaking stoppage working fluid is prepared from, by weight, 100 parts of G-grade oil well cement, 44-60 parts of slag, 23-67 parts of lightening admixture, 8-12 parts of micro silicon, 0.4-1.2 parts of dispersant, 4-5 parts of fluid loss agent, 0.4 part of retarder, 1 part of fiber, 131-214 parts of water and 0.5 part of foaming agent. The density of the curable low-density leaking stoppage working fluid is 1.20-1.50 g / cm<3>, the curable low-density leaking stoppage working fluid is high in early strength and thixotropy, free of free water and good in system stability, and the technical problem that a curing body cannot be formed due to bridge plug leaking stoppage in a conventional leaking stoppage method and the cement leaking stoppage cutting body difficultly stays at a leaking layer is solved. After leaking stoppage is carried out, the formation pressure bearing capacity at the leaking layer can be improved, and the technical defects of the existing conventional leaking stoppage method are overcome.

The invention specifically relates to an additive composition applicable to viscosity reduction of an oil-based drilling fluid and application thereof, and the oil-based drilling fluid and application thereof. The additive composition is a double block copolymer which is composed of a block A and a block B, wherein the block A is composed of a constitutional unit as shown in a formula (1) which is described in the specification and has a number-average molecular weight of 1500 to 10000, and the block B is composed of a constitutional unit as shown in a formula (2) which is described in the specification. The double block copolymer can be used as a viscosity reducer for the oil-based drilling fluid, especially as a viscosity reducer for a high-density clay-free oil-based drilling fluid; and the double block copolymer can greatly reduce the apparent viscosity and plastic viscosity of the oil-based drilling fluid in high-temperature high-pressure strata while guaranteeing proper shearing force, so drilling speed can be conveniently accelerated and difficulty in well drilling can be reduced.

The invention discloses a casing scraper. The casing scraper is characterized in that the middle of the inner side of an upper connector is fixedly connected with the upper end of the outer side of a body; the middle of the inner side of a lower connector is fixedly connected with the lower end of the outer side of the body; a radially retractable scraping pipe sleeves the body and is positioned between the upper connector and the lower connector, and scraping teeth are arranged on the scraping pipe; the scraping pipe comprises an upper connecting head, a lower connecting head and at least two elastic scraping sheets; the axially retractable elastic scraping sheets which are circumferentially distributed are arranged between the upper connecting head and the lower connecting head in a fixedly connected manner, and each elastic scraping sheet is in the shape of an arch with a high middle and two low sides. The casing scraper has the advantages that the casing scraper comprises a drop-proof connector, the upper portion of the casing scraper is mounted on the lower portion of the lower connector in a threaded manner when the casing scraper is used, a first lower connector with the casing scraper can idle when strings reversely rotate in repeated scraping and string tripping procedures, threaded connection between the first lower connector and the casing scraper can be prevented from being loosened, the casing scraper can be prevented from dropping in service procedures, and the problem of downhole accidents due to the fact that existing scrapers are released and fall into wells can be solved.

The invention relates to a marine drift diameter gauge type drill rod or oil pipe leakage flux detection device and method. The marine drift diameter gauge type drill rod or oil pipe leakage flux detection device is provided with a fishing head and a drift diameter gauge, wherein the drift diameter gauge comprises an excitation coil and a signal acquisition and emission device; the excitation coil is electrified by a lithium battery; the excitation coil is electrically connected to the signal acquisition and emission device; a permanent magnet is arranged between the fishing head and the drift diameter gauge; the magnetic field of the permanent magnet is contrary to the magnetic field of the excitation coil; and the signal acquisition and emission device comprises a leakage flux sensor, an amplification filtering circuit, an A / D (Analog to Digital) conversion circuit, a coder and an electromagnetic wave emitter and is used for acquiring and transmitting flaw signals. The marine drift diameter gauge type drill rod or oil pipe leakage flux detection device has the beneficial effects that the online detection of an oil pipe or a drill rod is realized, the flawed drill rod or the flawed oil pipe is timely rejected; the additional operation cost resulting from drilling troubles caused by descending a well is avoided; and the drill rod or the oil pipe does not need to be transported to the land for detection.

The invention provides a cuttings bed recognition system. The system comprises a cuttings bed recognition device, a signal transmission device, a signal decoding recognition device and a display device. The cuttings bed recognition device is arranged on a drill column and used for collecting cuttings bed information data, a coding rule is used for coding information data, and a coding result is obtained; the signal transmission device receives the coding result, and the coding result is transmitted to the signal decoding recognition device, the signal decoding recognition device is arranged onthe ground and can receive the coding result, according to the coding rule, the coding result is subjected to decoding recognition to obtain a decoding recognition result, and the display device receives the decoding recognition result and displays a cuttings bed simulated diagram according to the decoding recognition result. The cuttings bed recognition system can achieve real-time detection andreal-time processing on the cuttings bed, long-time rotation stop condition of the drill column can be avoided, and the drilling work efficiency is improved.

The invention provides a cuttings bed identification method and a position determination method. The identification method comprises the steps of: arranging a plurality of signal receiving points in awell, determining whether the position of each signal receiving point in the well corresponds to the cuttings bed or drilling liquid according to the time interval between a transmitted detection signal and a received return detection signal, and obtaining a detection result; setting a coding rule, coding the detection result by using the coding rule, and obtaining a coding result; transmitting the coding result to the ground and decoding the coding result, identifying the cuttings bed after decoding, and obtaining a decoding identification result; drawing a cuttings bed simulated diagram according to the diameter of a wellbore and the decoding identification result, and completing the cuttings bed identification. The position determination method comprises determining the position of thecuttings bed in the well according to the position of the signal receiving points. The invention can identify and monitor the condition of the underground cuttings bed in real time, and can optimizedrilling measures according to the obtained cuttings bed simulated diagram, so as to perform the continuous drilling work conveniently.

The invention discloses a metal mine downhole microseismic monitoring system which comprises at least one downhole network multi-channel collector arranged in a roadway of a downhole monitored section. Every downhole network multi-channel collector comprises a plurality of difference input channels for analog signal collection, every difference input channel is respectively connected with a microseismic signal collecting device, every microseismic signal collecting device is fixedly distributed on downhole roadway side walls in different directions, and output ends of the downhole network multi-channel collectors are connected with a ground data receiving processing platform sequentially through a transmission local area network and a concentrator local area network. The metal mine downhole microseismic monitoring system has the advantages of performing microseismic real-time on-line monitoring and analysis, preventing downhole accidents, optimizing blasting and ore falling effect in the recovery process and mastering vibration conditions of surrounding device systems and the like and is suitable for being widely applied to the technical field of microseismic monitoring.

The invention relates to a method for the sidetrack drilling of radial branch well bores through hydraulic jet and a device thereof. The device comprises a first oil pipe and a second oil pipe, wherein the external diameter of the first oil pipe is smaller than the internal diameter of a sleeve arranged inside an oil well; and the end part of the first oil pipe is connected with a deflector. The external diameter of the second oil pipe is smaller than the internal diameter of the first oil pipe; and the second oil pipe is connected with a sidetrack drilling tool carrying out the sidetrack drilling of the radial branch well bores. The external dimensions of the deflector are smaller than the internal diameter of the sleeve; the deflector has a through passage communicated with the top and the side wall; and the sidetrack drilling tool is deflected to the side wall from the top of the deflector via the through passage. The device overcomes well-known defects, can correctly and conveniently fix the deflector at a set stratum position and have a correct drilling position. The device is particularly suitable for the sidetrack drilling of a well with an ultra short radius, can operate conveniently on a ocean platform, thereby avoiding the downhole accidents caused by a downhole tool, effectively shortening the drilling cycle, saving the drilling cost, reducing the labor intensity ofworkers, improving the construction effects and having great market potential.

The invention provides a well mouth operation visualization device, and solves the technical problem of bad underground accidents caused by falling of part of falling fishes into the well mouth againdue to possible cutting off of the falling fishes still in gas production trees during salvaging in the prior art. The device comprises a well mouth camera device; the well mouth camera device at least comprises a mounting base, a camera mechanism and a touch screen; the mounting base is provided with a hollow channel penetrating from one end to the other end; an upper joint and a lower joint arearranged at the two ends of the mounting base; and the camera mechanism is movably mounted in the mounting base. The device can directly help scene operators judge if tool strings pass through such well mouth devices as gas production trees under the condition of not influencing normal well mouth operation, so that the condition of cutting off of the falling fishes caused by wrong closing of wellmouth valves is totally prevented, and the underground accidents are prevented.

The invention belongs to the technical field of mechanical equipment, and particularly provides an electromagnet tripping mechanism capable of quickly hooking and a using method. The electromagnet tripping mechanism comprises a gland, an electromagnet, an overall fixing frame, a cover, a swing rod, an iron core assembly and a hanging plate assembly, wherein the electromagnet and the cover are sequentially connected to the middle of the overall fixing frame from left to right; the iron core assembly horizontally penetrates through the electromagnet from left to right, the right portion of the iron core assembly is connected into the cover, the left end of the iron core assembly and the left end of the electromagnet are connected through the gland, the right end of the iron core assembly is connected with the left portion of the swing rod in a matched mode, the right portion of the swing rod is movably connected with the overall fixing frame in the cover, and the lower portion of the swing rod is connected with the hanging plate assembly in a clamped mode. The problem that in a stall protection device of a trackless rubber-tyred vehicle, a steel wire rope large hook for hooking an intercepting device on the rubber-tyred vehicle cannot be hooked by a single person after falling off is solved, and the large hook can rapidly fall off when needing to fall off.

The invention relates to the technical field of oil recovery in oil fields, and discloses a soluble faucet, which includes a connecting pipe. One side of the cover is movably socketed with a faucet, and the front side of the faucet is welded with a connection block, and a hollow groove is opened on the front side of the connection block, and a limit block is movably socketed on the top side of the hollow groove, One end of the limiting block extends to the inner cavity of the hollow groove, the bottom of one side of the limiting block is fixedly installed with a clamping block located in the inner cavity of the hollow groove, and the bottom of the limiting block is fixedly connected with a spring. The soluble faucet facilitates better connection of the connecting pipe and the faucet through the mutual cooperation between the limit block, the clamping block and the spring, thereby solving the problem that the faucet is fixed with the connecting pipe by welding. The fixed method leads to the problem that it is difficult to replace the faucet when it is damaged, which improves the better connection effect.

The invention discloses an object falling prevention device of a shaft. The object falling prevention device is arranged in a sleeve pipe in the shaft and comprises a back off sub, a short pipe joint, at least one set of sealing rubber barrel and slips. The back off sub, the short pipe joint, the at least one set of sealing rubber barrel and the slips are sequentially connected from top to bottom, in work, a putting-down tool is connected with the back off sub and is used for putting the object falling prevention device of the shaft into a well, the at least one set of sealing rubber barrel and the slips are fixed with the sleeve pipe in an anchoring mode through hitting and pressing, and the back off sub and the short pipe joint are separated. According to the object falling prevention device of the shaft, the slips and the sealing rubber barrel are fixed with the sleeve pipe in the anchoring mode, the object falling prevention device and the sleeve pipe are firmly fixed together, the object falling prevention device can bear large impact force, oil pipes and various underground tools which fall from the upper portion are prevented from falling into an underground horizontal section, underground accidents are avoided, production operation cost is controlled, and the object falling prevention device is simple in structure and convenient to operate.

The invention discloses an underground cable docking device, which comprises a cover body, a commutating and voltage-stabilizing device, a metal cover, a coil, an upper metal post, an upper connection structure, a lower connection structure and a metal base. According to the underground cable docking device, the lower connection structure and the metal base can be connected with a motor of an underground submerged pump through a lower cable and directly put into a well, an upper cable is connected with the upper connection structure and then the upper connection structure and various components connected therewith are put into the well along with the center of a pipeline; the metal cover and the upper metal post generate electromagnetic suction force through electrifying the coil; and furthermore, due to the dead load of the upper cable, the upper connection structure and the components connected with the upper connection structure, the metal base and the bottom of the metal cover are close to each other and are docked and the lower connection structure and the upper connection structure are docked for electric conduction. The upper cable, the upper connection structure and the components connected with the upper connection structure can be put into the well along with the center of the pipeline, so that the cables are prevented from being extruded and damaged by the well wall, and meanwhile, the problem of downhole junks caused by friction with the well wall is solved.

The invention relates to a pump stopping wellhead pressure drop measuring transient well test method after acid fracturing. The method comprises the following steps that (1) pressure data in the whole acid fracturing process are recorded; (2) different fluid displacement data are recorded; (3) a well depth structure and the productive section well diameter are obtained; (4) frictional resistance is obtained; (5) well bottom pressure data in the whole acid fracturing process are simulated; (6) the effective reservoir thickness is gained; (7) the weighted porosity of the effective reservoir porosity is gained; (8) a rock compressibility coefficient is gained; (9) the formation pressure is converted, and the well bottom formation temperature is gained; (10) water saturation is obtained; (11) a water injection pressure drop transient well test analysis model is established; (12) all relevant parameter of the selected analytic model are obtained; and (13) all the parameters are obtained for reservoir evaluation. Through the method, the formation parameters are effectively obtained for reservoir evaluation. The test cost is reduced, the test construction risks are reduced, the individual well yield is not influenced, and the dynamic test data gaining rate is increased.

The invention relates to the technical field of oil field oil recovery, and discloses a soluble water nozzle. The soluble water nozzle comprises a connecting pipe; one side of the connecting pipe is fixedly connected with a fixed sleeve, and the outer surface of the fixed sleeve is movably sleeved with a sealing ring; one side of the fixed sleeve is movably sleeved with a water nozzle, and a connecting block is welded on one side of the front surface of the water nozzle; a hollow groove is formed in one side of the front surface of the connecting block, and one side of the top of the hollow groove is movably sleeved with a limiting block; one end of the limiting block extends into an inner cavity of the hollow groove; a clamping block positioned in the inner cavity of the hollow groove isfixedly mounted at the bottom of one side of the limiting block; and the bottom of the limiting block is fixedly connected with a spring. Through cooperation of the limiting block, the clamping blockand the spring, the soluble water nozzle is convenient for preferable connection of the connecting pipe and the water nozzle, so that the problem of more difficult replacement of the damaged water nozzle caused by a welding fixation mode in the fixing process of the water nozzle and the connecting pipe is solved, and the connecting effect is improved.