102results about How to "Increase the encounter rate" patented technology

The invention belongs to the field of oil and gas field exploration, discloses novel technology for volume fracturing of a compact oil reservoir, and particularly relates to a sectioned multi-cluster synchronous volume fracturing technology for double horizontal wells. The technology is characterized by including the steps of synchronous fracturing selection, synchronous fracturing well selection, multi-section and multi-cluster perforation position determination, synchronous fracturing construction and synchronous fracturing effect evaluation. In the technology, cracks are impelled to turn by means of interference among the cracks, thereby realizing complicated netted cracks and effectively modifying the compact oil reservoir.

The invention relates to a method for gas extraction through a bedding directional long drill hole traversing working face in a broken and soft coal seam. According to the method, through an air screwmotor directional drilling technology, the bedding gas extraction long drill hole is constructed in a tunneled roadway on one side of the working face of the coal seam, and the drill holes penetratesthrough a to-be-tunneled roadway on the other side of the working face to the position, within the control range of 15-20 m, of the outer side of the roadway; and after the drill hole is completed, adrill tool is lifted up, an open-close type guiding drill bit and a drill rod with a large through hole are put down, then a hole protection screen pipe is put down through the center of the drill rod, then the drill rod is lifted up, the screen pipe stays in the hole, and then a gas extraction pipeline is connected for gas pre-extraction. An air screw motor directional drilling method is adoptedin the gas treatment technology so that the drilling depth of bedding extraction of the broken and soft coal seam and the coal seam drilling-encounter rate can be greatly increased, invalid footagesare reduced in quantity, meanwhile the drill hole coverage range is ensured, the purpose of gas pre-extraction outburst elimination of the stope face and the to-be-tunneled roadway is achieved, and safe tunneling of the coal seam roadway and safe extraction of coal extraction work face are ensured.

The invention discloses a universal method for forecasting in-target situation of guide drilling. The universal method includes: on the basis of survey data of last two survey points of a real drilling trajectory, calculating trajectory characteristic parameters of unsurveyed sections; calculating trajectory parameters of a well bottom point on the basis of the trajectory characteristic parameters of the unsurveyed sections of the real drilling trajectory; establishing coordinate transformation relations between a general target plane equation as well as a target coordinate system and a wellhead coordinate system; according to a landing-controlled anticipating guide drilling technology, determining a borehole trajectory model and the trajectory characteristic parameters of a forecasting trajectory and establishing a coordinate equation of the forecasting trajectory; establishing and calculating a constraint equation of the forecasting trajectory to acquire well section length of the forecasting trajectory; calculating the in-target location and judging whether a target is in place or not and forecasting the in-target direction. By the universal method, the target-in location and the target-in direction can be forecast, and the universal method is applicable to different well types like directional wells and horizontal wells even to special formed target sections and various drilling modes like sliding guide drilling, rotating guide drilling and composite guide drilling.

The invention discloses a deep horizontal well drilling track regulating method, which comprises the following steps of: before the drilling of a drilling well, using an adjacent well speed field for predicting the main formation limit depth of the drilling well; before the drilling to a target layer, virtualizing the drilling well into a pilot well; obtaining the actual formation limit depth of the drilling well and a quarto well logging curve while drilling; correcting the deep formation limit at the main formation depth obtained before the drilling according to the obtained actual formation limit depth, and obtaining a corrected marking layer depth; performing the putting into a seismic profile according to the obtained quarto well logging curve in accordance with the marking layer so as to reverse the speed field of the drilling well; predicting the depth of the target layer of the drilling well according to the speed field of the drilling well; and regulating the drilling track set in the last time if the difference of the current predicted depth of the target layer and the depth of the target layer predicted in the last time is greater than the preset deviation threshold. The method has the advantages that the Yuanba horizontal well track optimization and regulation are effectively guided, and the effective reservoir drilling ratio is improved.

The invention discloses a remote real-time tracking method for a well path, which relates to the technical field of real-time tracking of a wellbore path of a petroleum drilling well. The method of the invention comprises the following steps: remotely transmitting the wellbore path (LWD/MWD) measured in real time on the field, real-time measured data when drilling, well top coordinate data, well deflection data, stratum data, lithological profile data and stratigraphic dip data to a base server, reading the data from a database of the base server, generating a real-time well deflection path tracking chart according to an established mathematical model, and issuing synchronously through Web. The invention excludes the influence of adverse factors of complex geologic structure, obscure stratigraphic dip, thin objective target reservoir and the like, can accurately shoot the target point according to design, and obviously improves the exploratory development effect of a horizontal well.

The invention discloses a method for judging carbonatite hole crack growth characteristics. The method comprises the following steps: a) processing three-dimensional seismic data and performing breakage explanation and position tracking; b) utilizing seismic data to forecast effective reservoir thickness and effective reservoir porosity; c) analyzing reservoir lithology, reservoir space type, filled degree of hole crack reservoir and change rule of the filled degree of hole crack reservoir along longitudinal direction and horizontal direction; d) while confirming boundary, researching connectivity of reservoir along the longitudinal direction and horizontal direction, inter-well connectivity and oil-gas-water boundary; e) establishing regional oil and gas reservoir profile and unit oil and gas reservoir profile according to fault line, tectonic line, fluid line, pinch-out line and phase-change line, depicting, dividing a developing unit and drawing a developing unit and oil bearing area graph. According to the method provided by the invention, the drilling rate of the reservoir is increased, the leading comprehensive success rate of exploration and development drilling in China is achieved and single-well high yield and stable yield are achieved.

Disclosed is a drilling tool assembly used for directional hole-forming underground a coal mine and provided with an air screw motor and construction method. The drilling tool assembly comprises a directional drill bit, the air screw motor, a lower non-magnetic drill rod, a wireless electromagnetic wave measurement while drilling short section, an upper non-magnetic drill rod, a middle drill rod and a blower which are connected in sequence. The drilling tool assembly can carry out composite drilling and sliding directional drilling for construction: when composite drilling is conducted, the air screw motor drives the directional drill bit to crush rocks in rotatably, meanwhile, the middle drill rod rotates to drive the air screw motor to rotate, boring mud at the bottom of a hole is discharged from the bottom of the hole by compressed air along an annular gap, and the middle drill rod can be used for auxiliary slagging; and when sliding directional drilling is conducted, the middle drill rod does not rotate, the directional drill bit is driven by the air screw motor driven by the compressed air to rotate to crush rocks, and the track of the hole is controlled by changing the elbow orientation of the air screw motor. Thus, according to the drilling tool assembly used for directional hole-forming underground the coal mine and provided with the air screw motor and construction method, the drilling depth of a soft coal seam and the coal seam drilling-encounter rate can be improved greatly, and the drilling gas extraction effect is improved.

The invention provides a well-to-seismic integration based horizontal well geosteering modeling method. The method includes a step 1 of collecting adjoining well data and three-dimensional seismic data in a small range of a working zone; a step 2 of performing stratum comparison according to the collected working zone adjoining well data and dividing into small layers; a step 3 of establishing a working zone three-dimensional digital geologic body by utilizing a common Kriging interpolation method according to the adjoining well layering data; a step 4 of cutting a two-dimensional profile mapfrom the three-dimensional geologic body along a well body track; a step 5 of cutting a two-dimensional profile along the well body track after treatment of three-dimensional seismic data by utilizinga time-depth relation in the working zone and performing overlapping display on the two-dimensional profile and the stratum model cut from the three-dimensional geologic body; a step 6 of adjusting the stratum body according to a form of an event of the seismic section so as to enable the stratum model form to fit the form of the seismic event. By adopting the method provided by the invention, the construction description precision and the reservoir predication accuracy are improved and a sound technique guarantee is provided for horizontal well geosteering.

The invention provides a compaction-correction-based isochronous stratigraphic interface tracking and contrasting method. The compaction-correction-based isochronous stratigraphic interface tracking and contrasting method comprises the following steps: step one, selecting a well with a clear mark layer and a clear research layer section as a standard well, taking the well as reference well for building a connecting-well section, and then flatly drawing the tops of the mark layers of the standard well and the well to be researched to build an isochronous standard reference surface; step two, estimating the ancient restoration thickness of destination bedded sandstone and mudstone; and step three, determining the isochronous stratigraphic interface of the well position to be layered according to the isochronous standard reference surface determined in the step one and the ancient restoration thickness of destination bedded sandstone and the mudstone estimated in the step two. Through the compaction-correction-based isochronous stratigraphic interface tracking and contrasting method, the practical restoration thickness of the sandstone and the mudstone can be judged through the differential compaction effect of the sandstone and the mudstone, so that the influence of the sandstone and the mudstone on the differential compaction effect can be eliminated; the accurate identification and contrast of the isochronous interface can be finally achieved.

The invention discloses a seismic inversion method and device. The method comprises the steps that according to wave impedance curves of all drilled wells in a research block, it is judged that inversion is feasible, and a wave impedance value of a while-drilling point is obtained in the process of logging while drilling; according to the wave impedance curves and the wave impedance value of the while-drilling point, statistics is performed on wave impedance probability distribution curves of the research block; inversion is performed according to the wave impedance probability distribution curves to obtain an inversion result; a wave impedance value of a next while-drilling point is obtained, and statistics is continued to be performed on the wave impedance probability distribution curves of the research block until the drilling process is completed. According to the seismic inversion method and device, inversion accuracy can be improved. Furthermore, a hole drift angle is adjusted according to the inversion result, and the drill encounter rate of a reservoir of a horizontal well is increased.

The invention discloses a water jet dense comb-shaped hole drilling type to-be-tunneled roadway coal seam gas outburst elimination backing pump treatment method which comprises the following steps: I,constructing orientated long drilling holes; II, constructing water jet dense comb-shaped holes; III, sealing holes, and extracting and exploring gases. By adopting the method, very small radius water jet dense comb-shaped branched holes are constructed in a bottom plate of a to-be-tunneled roadway in an underground coal mine, hole drilling depths of single branch holes are reduced, the number ofbranch holes is greatly increased, the coal layer permeation improvement and gas extracting and discharge effects of the orientated long drilling holes are improved, the purpose of to-be-tunneled roadway coal seam gas backing pump outburst elimination can be achieved, and safe tunneling of a coal seam roadway is ensured.

A multistage cuttings discharge air-screw motor for underground coal mine drilling comprises a connector, a motor assembly, a universal shaft assembly, and a transmission shaft assembly; the motor assembly inputs compressed air for rotation driving, the universal shaft assembly and the transmission shaft assembly transmit power, a single-bend outer pipe of the universal shaft assembly can provide directional drilling, and the motor assembly is provided with a continuous right-handed spiral groove; when rotating, the screw motor stirs depositing cuttings, assisting air in discharging the cuttings out of a borehole; multistage cuttings discharge is achieved by adding two sets of reverse bypass holes, and it is ensured that the motor can still normally rotate to discharge powder when a bit blocks at the bottom of the borehole or cuttings accumulate at the bottom; by providing a one-way valve, high-pressure gas is avoided carrying the cuttings reversely into the motor, causing damage to the motor. The multistage cuttings discharge air-screw motor is used with an underground while-drilling measuring system in the construction of long boreholes along an underground coal mine broken-soft coalbed, cuttings discharge effect can be improved, intra-borehole resistance is decreased, construction safety is ensured, and construction depth of boreholes along underground coal mine broken-soft coalbeds and coalbed drilling catching ratio are increased.

The invention belongs to the field of horizontal well logging guiding technologies, and discloses a horizontal well target layer dynamic modeling method while drilling. The method is mainly characterized in that before landing, the dip angle, in a profile, of a target layer is firstly calculated; then the drilling thickness of the target layer is calculated according to the depth of the top surface of the target layer to be drilled; with the lithology, the electrical property, gas logging and other longitudinal change characteristics, in an adjacent well, of the target layer as reference, the longitudinal position, in the layer, of a drill bit is judged while drilling, an upper boundary line and a lower boundary line of the target layer are reverse calculated with the position of the drill bit, target layer dynamic modeling while drilling is achieved, and track design in a next step is carried out according to a latest deduction model. Through calibration, correction and deduction carried out on the form of the target layer by information while drilling, the horizontal well target layer dynamic modeling method while drilling achieves dynamic fine depiction of the target layer, improves prediction accuracy, guides fining adjustment and control over a track, guides the drill bit to effectively penetrate through the target layer, and finally improves the drilling catching rate.

The invention provides a carbonate reservoir interpretation method and an interpretation template establishment method. The interpretation template establishment method comprises the steps that a interpretation template of a carbonate reservoir under low frequency and/or medium frequency and/or high frequency is established; low-frequency and/or medium-frequency and/or high-frequency condition elastic parameter test results of cores with different porosities in a target layer of a work area under different oil saturation degrees are acquired; the low frequency is consistent with earthquake dominant frequency, the medium frequency is consistent with logging frequency, and the high frequency is consistent with stratum ultrasonic testing frequency; the low-frequency and/or medium-frequency and/or high-frequency condition elastic parameter test results of the cores with different porosities under different oil saturation degrees are projected into a coordinate system of which the coordinate axes represent longitudinal and transverse wave parameter ratio and longitudinal wave impedance; and a query chart of longitudinal and transverse wave parameter ratio values and longitudinal wave impedance values of the cores with different porosities and different oil saturation degrees under low-frequency and/or medium-frequency and/or high-frequency conditions is established, where the querychart is the interpretation template of the carbonate reservoir under the low-frequency and/or medium-frequency and/or high-frequency conditions.

The invention discloses a method for identifying and comparing stratums by using an element comparison relationship. The method comprises the following steps of collecting element logging data of a well adjacent to a drilled well, and calculating the relative content of each element logging; establishing an element stability index curve of the adjacent well; obtaining element logging data in welldrilling through element logging work in well drilling, calculating an element stability index in well drilling, summarizing and concluding morphological characteristics of the element stability indexin well drilling and summarizing quantitative characteristics; comparing the element stability index morphological characteristics and quantitative characteristics of the drilling well and the adjacent well, and identifying the drilling position of the drilling well; and judging the drilling condition of a target stratum of the drilled well, and forming stratum position description of the drilledstratum. According to the method, data fitting is carried out by using data in an element logging technology to form a method for stratum identification and comparison by using the element comparisonrelationship, and the method is mainly used for on-site exploration and development of oil and gas fields.

The invention relates to the technical field of short frontal distance from target point horizontal well drilling processes, in particular to a coal-bed gas well short frontal distance from target point horizontal well integration process method. According to the coal-bed gas well short frontal distance from target point horizontal well integration process method, window sidetracking can be carried out in a minimum casing pipe of five and a half inches (the outer diameter is 139.7 mm and the inner diameter is 124 mm), new well hole drilling can be carried out, and the adaptability is wide; theangle building hole rate ranges from 0.4-1 degrees/m, and the effective footage is saved; the drilling construction is combined with geosteering, and the coal seam landing accuracy and the drilling ratio are improved; clean water is used for horizontal section well drilling construction, and the reservoir pollution is avoided; the length of a horizontal section is larger than 200 m, and a coal seam control area is enlarged; a well completion pipe string adopts a hanger, a steel casing pipe and a ball activated sliding sleeve, the well completion well cementation is carried out, an annulus below the hanger is sealed, the support is provided for follow-up transformation while a well wall is supported; and the reservoir transformation is combined with a fracturing technology, an oil and gaschannel is enlarged, and the single well yield is increased.

A method for increasing the drilling rate of a tight oil reservoir of a horizontal well comprises the steps that 1, lithofacies indexes are calculated; 2, calculating the sandstone density of the tight oil reservoir; 3, calculating the physical property index of the tight oil reservoir; 4, calculating the oil content index of the tight oil reservoir; step 5, creating a tight oil reservoir comprehensive evaluation index calculation model; step 6, establishing a three-dimensional geological model of the tight oil reservoir; step 7, geoderivation is carried out based on the tight oil reservoir three-dimensional geologic model; 8, updating and correcting the three-dimensional geologic model of the tight oil reservoir in real time, and guiding the drilling direction according to the updated andcorrected three-dimensional geologic model to improve the drilling rate of the tight oil reservoir of the horizontal well; the geological model provided by the invention is closer to real geologicalcharacteristics, and the drilling rate of the tight oil reservoir is further improved.

The invention discloses a track while drilling control method of a shali shale oil horizontal well. The track control while drilling method includes the following steps that (1) an optimal synthetic seismic trace is determined, and according to the seismic velocity of the sweet spot section the horizontal well, a seismic sweet spot time window is generated; (2) a standard logging response curve atthe sweet spot section is established by using the corresponding form of a well log of a known well, and a prediction logging curve is generated according to a designed track of the shale oil horizontal well; and (3) in the process of while drilling, according to a real-time logging curve, and in reference to a logging absolute value and the variation amplitude of a marker bed section, a track while drilling is adjusted in time. The track while drilling control method has the beneficial effects that (1) in the case of human intervention, a more accurate time-depth relationship is established;(2) on the basis of time-depth relationship establishment, the seismic profile position of the top and bottom of a sweet spot is calculated, the sweet spot time window is determined, and during drilling, the track while drilling is optimized by projecting the position of a drill bit in real time; and (3) a formation standard logging curve of the area is established by using the known well and theformation dip angle, the track is adjusted in time, and the reservoir drilling rate is increased.

The invention discloses a method and a device for controlling the wellbore trajectory of a stepped horizontal well, which belong to the field of oilfield exploitation. The method includes the following steps: acquiring the depth of a target oil reservoir, the change of the dip angle of the target reservoir, the fault distance of a fault and the relative positions of fault plates according to the seismic data; and by starting from the development well location of the target oil reservoir, continuously adjusting the drilling direction of the drill bit to complete the drilling of a straight section, a first horizontal section, a stepped section and a second horizontal section of the stepped horizontal well. The depth of the target oil reservoir, the fault distance of the fault and the relative positions of the fault plates on the two sides of the fault can be acquired in advance according to the seismic data. Therefore, the drilling distance and direction can be adjusted directly in the process of drilling according to the data acquired in advance, the drill bit can enter the target oil reservoir accurately and enter the second horizontal section of the target oil reservoir from the first horizontal section of the target oil reservoir, and the control accuracy of the wellbore trajectory of the stepped horizontal well is improved.