92 results about "Depth in a well" patented technology

The invention is a method which surveys the coagulation status and its relevant time of annular cement under high pressure and high temperature, while simulating different depths and static conditions. It is adaptive to activities such as petroleum well and gas well reinforcement, squeezing cement, pouring cement seal and leakage repairing. The invention provides with the ability of surveying starting and ending time of different coagulation periods, in cement liquor under high temperature and high pressure, by surveying the variation of heat released by cement hydrating. First pre-heat the kettle to a experiment temperature, then put in it with a cup filled with prepared cement liquor in a reactor, seal reactor and increase the pressure to experiment value after the temperature is stable both outside and inside; initiate data processing system so to record the temperature variation automatically with a computer; finally figure out the coagulation starting and ending time by time-temperature curve line. The problem that surveying is difficult under high temperature and high pressure, is resolved with the invention which is adopted with the indirect contacting continuous survey of temperature variation.

The invention provides a pinnate branch well sidetracking and completion integration device and method using a coiled tubing carrying sieve tubes. The technical scheme relates to such devices as a tubing anchor, a diverter, the coiled tubing, a sieve tube separating device and a jet bit. The method comprises the steps of tripping in a tubing provided with the anchor and the diverter after the casing cementing of a main horizontal well section; tripping in the coiled tubing carrying the sieve tubes from the inside of the tubing after setting the direction and anchoring the tubular column; using abrasive jet flow to perform window sidetracking; when the sidetracking reaches the designed well depth of branch well holes, separating the sieve tubes from the separating device and leaving the sieve tubes in the branch well holes through ball throwing and pressure building in the coiled tubing; taking the coiled tubing from the well hole at the same time; performing the window sidetracking and ball throwing separation after adjusting the well depth and the direction of the tubing again. Thus, the drilling and completion integration process using the coiled tubing carrying the sieve tube for sidetracking is completed.

The invention discloses a petroleum drilling well depth measuring system and method. The system comprises a winch sensor, a pressure sensor, a hanging load sensor, a laser range finder, a field controller and a monitoring operation terminal. According to the method, the laser range finder is fixed on a large hook during system initial assembly debugging, the large hook is controlled by a winch to move vertically, the onsite controller records the displacement value of the laser range finder and the ring number of the winch in real time to form the corresponding relation between the value of each ring and the displacement value, and the height value of the large hook is read automatically according to the ring number value program of the winch during normal during normal well drilling. In the drilling process, a hydraulic power tong pressure sensor transmits signals to indicate unfastening or fastening and the corresponding hanging load value change, a controller judges whether a drill pipe enters or leaves through the program, and the height change values of the large hook is accumulated to obtain the well depth and the drill bit position value. The system and method overcomes the shortcoming that the traditional measuring mode is in accurate in measurement or complex in measurement work and inconvenient to operate, and is capable of accurately measuring the well depth and the drill bit position and capable of displaying the well depth data in real time without manual operation.

The invention relates to a portable automatic measuring instrument and a measuring method for ground water level and well depth, and belongs to the technical field of special equipment for monitoringground water level and well depth. One end of a measuring line (24) is wound on a main line wheel (49); and the other end of the measuring line (24) passes between a length counter sensor (22) and a line conveying wheel (50), and is connected with a measuring probe (25) through a first measuring line guide hole (23) and then a second measuring line guide hole (51) at the bottom of the shell. The measuring line (24) is composed of a measuring line insulating layer (26), a first lead wire (27), and a second lead wire (28); and the measuring line insulating layer (26) is arranged outside the first lead wire (27) and the second lead wire (28). According to the portable automatic measuring instrument and the measuring method for ground water level and well depth, the measurement for the water level and the well depth are integrated, so that the measurement is greatly simplified, the labor intensity is relieved, the errors that may be caused by artificial sensations in the well depth measurement are eliminated, and the accuracy of the measurement data is greatly improved.

The invention relates to the technical field of natural gas exploitation and in particular relates to a building method and an application of a three parameter-gas well drainage gas recovery technology optimizing model. A difficulty of rapid selection of drainage gas recovery technology for water-producing gas well is solved. The building method comprises steps of first, collecting production parameters of a water-producing gas well of a gas field, then calculating different daily gas production of a given oil pipe aperture and natural gas critical liquid carrying flow under a water-gas ratio at different well depths, drawing out natural gas critical liquid carrying flow curves (a,b) of maximum and minimum oil pipe apertures on daily gas production, water-gas ratio and well depth three-dimensional model, and drawing out a curve (c) with liquid production amount being 95m<3> on the three-dimensional model. The natural gas critical liquid carrying flow calculated by the method meets on-site production condition in a better way; and the building method is advantaged by quick determination of gas well drainage gas recovery technology based on simple parameters such as daily gas production, water-gas ratio and the well depth.

The invention discloses a while-drilling multi-parameter analysis-based oil-gas-water identification method. The method comprises the steps that chromatography signals of oil-gas-water in a reservoir stratum are acquired while drilling so that chromatograms are obtained; the cross-correlation function of the oil-gas-water chromatography on a continuous shaft depth and a standard chromatography and water-oil-gas characteristic parameters are obtained according to the chromatograms; and the cross-correlation function is subjected to Fourier inversion to obtain cross-correlation coefficients of any two chromatograms, and reservoir stratums or depths corresponding to the oil-gas-water chromatography signals are identified according to the changing direction of upper-and-lower-layer oil-gas-water features which are reflected by the amplitudes of the cross-correlation coefficients. According to the while-drilling multi-parameter analysis-based oil-gas-water identification method, gasometry chromatography is characterized in that the position of each component is known qualitatively after separation, and the chromatograms are regarded as spectrograms for analogy-analysis and calculation of correlations among the chromatograms and the three characteristic parameters representing the oil-gas-water features; reservoir stratum fluid features can be effectively identified; and the method especially has a very good effect for aquosity.

The invention relates to a method for correcting the depth trace of self-adapting well drilling, in particular to a new method for correcting the well depth trace of the well drilling, which belongs to the technical field of measurement well drilling. The method comprises the following steps: firstly, obtaining correction coefficients (K1, K2, K3, ... Kn) according to the variations of coded disc counts and the variations of a drilling tool corresponding to each layer of wire ropes of a winch; secondly, training the correction coefficients with observed well depth, and dividing the variance of observed values and measured values into three regions, wherein each region corresponds to zero, big and small fuzzy numbers, and each fuzzy number corresponds to weighting coefficients k1, k2 and k3; and thirdly, counting the variations of the correction coefficients simultaneously to obtain the variation trend Va of the correction coefficients. The trained correction coefficients can make the variations of the correction coefficients automatically trend to influences on the correction coefficients by various factors; and the depth of the well drilling measured by the method trends to the precision gradually, the measuring errors are attenuated quickly, and the errors generated by initial depth correction and error corrections of the correction coefficients caused by introducing error observed values are eliminated effectively.

The invention discloses a method for extracting coal bed gas under wells through the alternate cooling and heating function, and belongs to the technical field of unconventional oil and gas production. The method comprises the steps that (1) vertical well drilling is carried out from the ground, a well pattern is arranged, the wells are drilled till a coal layer, the number of the wells is largerthan or equal to 2, at least on well in the arranged well pattern is a work well, and the other wells are adopted as gas extraction and production wells; (2), a heat source is input into the coal layers from the work well, the temperature of the heat source is adjusted to range from 380 DEG C to 450 DEG C, the coal layer is heated, and when the temperature of the coal layer is larger than or equalto 350 DEG C, heating is stopped; (3), liquid nitrogen is injected into the coal layer through the work well, the injection amount of the liquid nitrogen is determined according to different geological conditions and coal body features, and after the liquid nitrogen is vaporized, refrigeration is finished; and (4), the step 2 and the step 3 are repeated many times, the coal layer is located in analternate work state all the time, and coal layer gas is extracted in the gas extraction and production wells. According to the method, coal layer gas extraction can be effectively carried out, and the coal layer gas extraction speed and the extraction rate are increased.

The invention discloses a multi-point oriented coring system and a method for drill core. The system includes: a rope coring part, an underground orientation device, a searching tube orientation unit, a PC machine and a software kit, a printer, a ground winch and a deep measurement system. The invention also discloses a multi-point oriented coring method for drill core which includes steps as follows: confirming the drill core position and a corresponding relationship relative to magnetic north orientation in a same time according with a real-time clock of a drill core orientation instrument and a real-time clock of the underground deep device, accordingly, calculating the inner drill core orientation of the whole coring pipe correctly.

The invention relates to a method for designing a safety drilling fluid density window during shale formation drilling. The method specifically comprises the following steps: testing crustal stress, formation pore pressure and the like; transforming a borehole rectangular coordinate system, a geostress coordinate system and a geodetic coordinate system; calculating each stress component of the well walls caused by geostress and drilling fluid pressure in the borehole; transforming effective stress of each stress component on the well walls in the borehole rectangular coordinate system into aneffective stress form in a borehole polar coordinate system; deducing mechanical laws of tensile and compressive shear failure occurring in wall rock during shale drilling, namely calculating the pressure of drilling fluid in the borehole when tensile and compressive shear failure occurs at different positions of the wall along the circumferential direction of the borehole, and respectively determining the converted drilling fluid density corresponding to the fracture pressure and collapse pressure; summarizing the converted drilling fluid density corresponding to the fracture pressure and collapse pressure at all well depths on the interval of interest of a target well, and drawing the safety drilling fluid density window. According to the method disclosed by the invention, the design result of the safety drilling fluid density window is true and reliable.

At least one of a DX geothermal refrigeration system design, a reverse-cycle DX geothermal heat pump system design, a DX geothermal cooling mode only system design, and a DX geothermal heating mode only system design, which utilize the sub-surface geology with a grouted well as a heat sink in the cooling/refrigeration mode, and as a heat source in the heating mode; with an optional air-source high level heat sink for use in the refrigeration mode; with optional multiple sub-surface larger sized vapor refrigerant lines, as well as with a super-efficient vacuum insulation design for relevant sub-surface refrigerant transport tubing, and with an optional specially designed electronic expansion valve.

The invention discloses a method and device for measuring downhole formation fluid pressure. The device comprises ground equipment and downhole apparatus, wherein the downhole apparatus is connected with the ground equipment; the ground equipment comprises a vertical pipe, a three-way pipe is installed on the vertical pipe, a pressure sensor is installed at the position of the three-way pipe, thepressure sensor is connected with a wireless pressure sensor main machine through a data line, the wireless pressure sensor main machine is connected with a sucker antenna, the sucker antenna is in signal connection with a wireless transceiver, and the wireless transceiver is connected with a data processing meter; and the downhole apparatus comprises a thrust assembly, and a thrust module and a probe module are installed on the thrust assembly. According to the method and device for measuring the downhole formation fluid pressure, the magnitude of different thrust force is set according to different well depths, when shallow well measurement is carried out, the energy consumption of the downhole apparatus can be reduced, and meanwhile, the risk of pressure damage to the well wall due to too large thrust force is reduced; and when deep well measurement is carried out, the thrust force is reasonably increased to enable the seal between a sealing probe and a well wall mud cake to be reliable, the influence of annulus pressure on formation fluid is reduced, and thus the accuracy of the measurement is improved.

The invention discloses a design method for the strength of a casing string. The method includes the steps of determining the steel grade and wall thickness of the first section of a casing, determining the length of the first section of the casing tripping in a well, carrying out internal pressure strength check on the first section of the casing, computing the length of the first section of the casing tripping in the well, and designing the second section of the casing, the third section of the casing and the like according to the steps until the designed casing reaches the well depth. The design method can be successfully applied to the strength design for the casing strings, the design method and process are simple, and the design cost is greatly reduced.

The invention discloses a confining liquid system beneficial for the stability of a barefoot well wall of a high temperature and high pressure well. The confining liquid system is prepared from the following components in parts by weight: 100 parts of fresh water, 10-20 parts of sodium bentonite, 2-4 parts of potassium chloride, 5-7 parts of caustic soda, 2-4 parts of low-viscosity polyanionic cellulose, 2-6 parts of a high temperature-resistant filtrate reducer, 10-20 parts of organic resin, 6-8 parts of a diluent, 7-9 parts of sulfonated lignite, 30-40 parts of sulfonated gilsonite, 2-4 parts of calcium oxide and 1-300 parts of barite. The confining liquid system is relatively good in rheological property, low in filter loss property and well in wall stability, and the problem that an electrical logging tool encounters resistance due to the situation that visual and thick mud cakes easily form on the well wall as the open hole section is exposed to well mud for a long time in the electrical logging operation period during the process of high temperature and high pressure well drilling can be solved; the confining liquid is applicable to the high temperature and high pressure well with the temperature of 150-220 DEG C, the long-term stability can reach 3 days, and the confining liquid has no special demand for well depth and is good in adaptability.

The invention relates to an oil and gas well completion temporary plugging lining pipe, which is used for the under-balanced well completion after under-balanced drilling, belonging to the field of whole process under-balanced drilling well completion snubbing manufacturing technology. Based on the characteristic that temporary plugging agent can melt under high temperature, the invention designs an oil and gas well completion temporary plugging lining pipe which has an upper joint and a lower joint, and is equipped with through sieve pores with temporary plugging agent inside on the pipe body, solves the problem that a tail pipe is perforated in the prior art, resulting in tail pipe deformation, and is in an unfixed state in a well, bringing in trouble to subsequent works, the sieve pores of the temporary plugging lining pipe are processed on the ground, thus the temporary plugging lining pipe has the characteristics of convenient process and deformation improbability, a different binder can be selected in accordance with a different well depth to implement temporary plugging, after the lining pipe is put in the well, the temporary plugging agent can melt slowly when the temperature in the well reaches to a preset value, thus a temporary lining pipe having sieve pores can be obtained.

The invention discloses a system, a device and a method for realizing the operation protection of a logging winch. The system comprises a depth monitoring system and a winch operation control device, wherein the depth monitoring system is used for comparing a detected instant well depth with a preset well depth and outputting an alarm signal to the winch operation control device if a comparison result is less than a threshold value; and the winch operation control device is used for controlling the logging winch to operate at a low speed by a preset low-speed control signal according to the input alarm signal. In the invention, correlation is established between a power system of the existing logging winch and the depth monitoring system, so that the automatic speed reduction protection of the operation of the winch and the safety protection of an instrument carried on the logging winch are realized. Moreover, part properties of a two-way variable displacement pump can be controlled according to the design requirement and an electro-hydraulic proportion, and a lifting or descending operation speed after the speed of the winch is automatically reduced is set in a certain range.

The invention discloses a brine drilling and exploiting system and a method for dynamic cleaning and salt deposition resisting in a closed cycle mode. The drilling system comprises a brine exploiting well (1), a brine diving electromotor (2), a screening pipe (3), a brine diving pump (4), a well inner pipe (5), a well opening pipe fixing steel channel (6) and a well opening pipe (7). A salt resisting brine mud fixing well table (15) and a well lid steel plate (16) are arranged at a well opening, and a support lifting device (17) for overhauling a brine sucking device is arranged on the upper portion of the well lid steel plate (16). The screening pipe (3) is located on the inner side of the bottom well wall of the brine exploiting well (1). The well opening pipe (7) is located at the position, close to the inner side of the well wall, of the salt resisting brine mud fixing well table (15), and the #-shaped well opening pipe fixing steel channel (6) is welded to the position below the well opening pipe. The brine diving pump (4) is fixedly arranged at the position with a certain depth in a well, and a fresh water pipe (8) extends into the well from the ground. A closed cycle dynamic cleaning method is adopted, deposited salt at an impeller and a runner can be dissolved through passing fresh water or lose adhesive force and is finally discharged from a water outlet pipe (9) to be discharged together with collected brine, and therefore stable exploitation of high-concentration and supersaturation brine in the deep portion can be achieved.

The invention relates to a method for designing cannon well depths based on microlog and non-seismic data. The method comprises the steps that the well depths are initially designed, the surface structure is surveyed in a non-seismic mode, an interpretation profile map of the surface structure is obtained, the depths of all exciting points are spread and drawn in the map, the adjusted exciting depths and the lengths of explosive columns are added, and the comprehensively-designed cannon well depths are obtained. The method for designing the cannon well depths based on the microlog and the non-seismic data can compensate for the defect that the density of the microlog is relatively low, after the non-seismic comprehensive surface survey is implemented, it can be ensured that the exciting points of seismic cannons are located in favorable exciting layers, so that it is ensured that the explosive exciting energy can effectively spread towards the underground deep layer, and an effective mean is provided for obtaining effective deep layer seismic reflection signals, improving the seismic effect and solving the problem of a deep layer structure. Due to the fact that the number of drilling wells in seismic exploration is huge, and the operation of reducing the exciting depth in a sand and mud layer to the reasonable small depth also has obvious economic significance on lowering the seismic exploration cost.

The invention discloses a logging method of an ultrasonic logger system. An underground gauge of the ultrasonic logger system is of a cylinder shape, m ultrasonic transducers with included angles of theta are evenly distributed at the bottom of the underground gauge, the underground gauge is perpendicularly hung in a well by a cable, the cable is connected with a logging winch by a depth gauge, the logging winch is connected with a well workstation, and the well workstation is connected with a printer. The underground gauge is dropped perpendicularly by the depth gauge, the underground gauge measures the well diameter, the depth gauge measures the dropping length of the cable to obtain the well depth data, and the well diameter data and the well depth data are transmitted to the well workstation. The logging method includes that the well workstation processes the received well diameter data by means of quadratic Bezier curve, or rational quadratic Bezier curve fitting horizontal section algorithm to obtain a well diameter which can correctly reflect the actual shape of a horizontal section.

The invention provides a method and system for designing the depth of a seismic source excitation well. The method includes the steps of S1, obtaining the maximum designed depth of the excitation well in an exploration region; S2, obtaining seismic data of the exploration region in a micro-logging mode; S3, extracting a set of seismic data in the seismic data according to a preset rule, and arranging the extracted seismic data according to the micro-logging excitation depth order to form an excitation seismic data record; S4, carrying out frequency spectrum analysis on the excitation seismic data record to obtain the frequency bandwidth of the excitation seismic data; S5, selecting the micro-logging well depth, meeting a preset amplitude, frequency bandwidth and adjacent channel waveform coincidence requirement, in the excitation seismic data record to serve as an optimal seismic source excitation segment. By means of the method and system, the reasonable seismic source excitation well depth can be obtained through design in a complex earth surface region, the seismic source excitation effect can be improved, and the signal to noise ratio of collected seismic data can be improved.

The invention provides an installation structure and installation method of an earthquake electromagnetic disturbance sensor. According to the method, a deep well is adopted for installation, an observation well is dug in an observation station, the inclination of the well is smaller than 5 degrees, a totally closed metal or nonmetal magnetic-free casing pipe is adopted, the electromagnetic disturbance sensor is vertically installed at the proper position within 1000 meters of the well depth, a locating base used for supporting the gravity of the electromagnetic disturbance sensor and a horizontal adjusting device used for adjusting the electromagnetic disturbance sensor to keep horizontal are arranged, a swinging ring is fixed to the top of the sensor and used for placing the sensor into the well and fixing the sensor, signals monitored by the sensor are sent to ground equipment through a signal cable, a cement well table is built at a well mouth, and a cement cover is additionally arranged for protection. According to the installation structure and installation method of the earthquake electromagnetic disturbance sensor, the structure is simple, implementation is easy, cost is low, and the floor space is small; interference of a high-voltage power transmission system, a rail transit system, large electric equipment, a metalloid pipeline system and a metalloid pipeline changing a surface electrical property structure, man-made interference and the like can be avoided effectively.