Method for horizontal well bore drilling on the base of geological investigations

FIELD: well drilling, particularly to provide designed well bore position on the base of geological investigations of drilled rock.

SUBSTANCE: method involves receiving information concerning drilling tool location from well bottom by means of land-based instruments; taking rock drilled out from well bottom after receiving of data by well operation investigations, directional survey and gamma-ray logging; performing geological-petrophysical and lithofacies drilled-out rock analysis; tabulating said analysis results to obtain lithologic-and-petrographic parameter and facies property table; plotting correlation scheme of lithologic-and-facies cut condition referenced to vertical depths with marking the most oil and gas advantageous intervals; controlling well bore path in productive bed to provide drilling tool movement through productive bed. Complex geological-petrophysical and lithofacies drilled out rock analysis includes macro description of rock under binocular, carbonate metering, luminescent-bituminological analysis, documentary photographing referred to vertical depths in white light and ultra-violet radiation; thermal vacuum degassing, petrophysical parameter, namely porosity, mineralogical and volumetric density investigation and determination of oil or gas content in drilled out rock with the use of liquid distillation apparatus.

EFFECT: increased reliability and minuteness of geological information obtained at horizontal well bore bottom and improved accuracy of well navigation by drilling tool directing relatively reservoir bottom and roof.

2 cl, 2 dwg, 1 ex

 

The invention relates to the field of drilling, and in particular to control the position of the barrel in the project reservoir, drilling horizontal wells according to the geological survey drilled rocks.

Modern field seismic geophysical methods to determine the surface the exact location of the geologic object in the thickness of the sedimentary rocks of the earth's crust is not possible. This task is complicated by the subject to the availability of geological objects with different heterogeneity in the structure associated with different facies conditions of formation of rocks in the appropriate geological epoch. To solve the task with greater accuracy allows drilling, i.e. the immediate opening of the geological section of the mining production - well. After receiving information about the depth of the reservoir, there is an opportunity to correct the trajectory of a horizontal well that is used in practice. To increase the extraction of minerals (oil, gas, coal, ores) you must ensure that the transaction trajectory mining well or shaft in the plane of the occurrence of the productive formation. However, to achieve maximum accuracy of the transaction is required to allow for changes as the position of a geological layer at about the tyranny and depth, and lithologic-mineralogical composition of the rocks (see Eeslyamova, Tel. Geological investigations in the drilling process. M: Oil and gas, 1997, s-101).

The known method Postings horizontal wells (see patent RU No. 1572097, date of publ. 1994.11.30, IPC EV 47/02). According to this method are drilling vertical shaft crossing the reservoir, set geophysical marker above the point of location of the cut slope of a trunk, located on the roof of the reservoir, and control the trajectory by measuring the angle and azimuth of the wellbore, carry out wiring horizontal wellbore using a deflecting device.

However, the definition of a cut on the sole lastoperation in terms of occurrence in the earth's crust geological formations, represented by a layer of rocks of a particular lithofacial, petrophysical, mineralogical composition and saturated hydrocarbons or ore minerals of certain physico-technical properties, is extremely difficult. In addition, it requires the drilling of many wells in this area of the field that their trunks cross be the development or study of the formation and will allow you to build a geological model. Obtaining information about the spatial location obtained at the one object in the context of rocks according to this known method, is on the refinement of the predicted geological model according to the geological information obtained in the process of opening strata of rocks by drilling. Obtained a limited amount of source data affects the accuracy of the transaction horizontal wellbore. The disadvantages of the method includes drilling a vertical section of the barrel, which is a time-consuming operation, requiring considerable investment of time and money, and even more costly makes way for the need to further work on grouting vertical section.

There is also known a method of wiring a horizontal wellbore (see patent No. 2263782, publ. 10.11.2005, IPC EV 47/02, G01C 19/00). This method, which is the closest to the proposed invention consists in obtaining ground devices downhole data channel connection with the operational control and management of the transaction. While downhole information displays the position of the whipstock relative to the magnetic Meridian and the magnitude of the azimuthal and Zenith angles obtained from the downhole sensors.

The disadvantage of this method is that, as in previous known method, the transaction is "blind", on a pre-programmed trajectory information, without taking into account changes of the geological section. This may lead to the drilling of squag who are in a predetermined path, but not in unproductive sediments. Another disadvantage is the inaccuracy of the measurements of the angle and azimuth, and a certain degree of error in the calculations the calculation of the trajectory of the horizontal wellbore, which may lead to the transaction horizontal wellbore outside the plane of the productive layer occurrence.

The objective of the proposed invention is a method of wiring the trunk horizontal wells, which takes into account state changes of the geological environment in the context of rocks along strike, depth and lithological composition.

When using the proposed method achieves the following technical result: improving the accuracy and detail of geological information from downhole drilling shaft horizontal wells in real time; improving the accuracy of navigation by focusing position of the drilling tool bit relative to the top and bottom of the formation; the ability to adjust the trajectory of the borehole during drilling; continuous measurement and recording of geological parameters and, consequently, reducing costs and ensuring accurate Postings of the shaft productive stratum.

This technical result is achieved in that in the method of wiring the trunk horizontal wells, glucouse obtaining ground devices information from downhole and control the motion of the drilling tool in a given direction, according to the invention receives data geotechnical studies, including gas-analyzing research gas mixture after degassing drilling mud, select rock, made with slaughter, produce complex geological-petrophysical and lithofacial study of drilled rocks, the results of the study bring to the table lithological and petrophysical parameters and facies properties of the drilled rocks, build a correlation scheme lithofacies status of the section with reference to vertical depths of identifying the most promising for oil and gas geological layers and on the basis of this information, carry out the adjustment of the trajectory of the barrel horizontal wells. This complex geological-petrophysical and lithofacial study drilled from the bottom rocks includes macropaedia breed with a binocular microscope, the study of its carbonate content, conducting luminescent bitumen analysis, photographers who have documented drilled rocks with reference to the depth in normal light and UV radiation, thermal vacuum degassing drilled rocks, study of petrophysical parameters (porosity, Mineralogy, and bulk density), determination of the useful life of fossil fuels. the constituent in rocks using the apparatus distillation of liquid.

Using data geotechnical studies, including gas-analyzing research gas mixture after degassing drilling mud, it is necessary to estimate the location of the horizontal shaft in the context of rocks. When this source of reliable and detailed information for navigating the reservoir are the results of complex geological-petrophysical and lithofacial studies drilled rocks.

The results obtained in studies of the detail section, more detailed dissection on the basis of mineralogical, textural, texture, facies changes, are summarized in table lithological and petrophysical parameters and facial properties, and the construction of correlation diagrams lithofacies section with reference to vertical depths allow you to post the trajectory of the horizontal shaft in the sediments with the best reservoir properties and maximum Neftegazodobycha.

Integrated geological-petrophysical and lithofacial study of drilled rocks (sludge), which includes a fixation as the main characteristics (color, texture, structure, inclusions)and minor (such as shades, fracture, dolomitization, okremnennye and others), allows a more detailed study of lithological the features, up to defining facial features.

The way of the posting of the barrel horizontal wells on the basis of geological studies are presented in the following graphics:

figure 1 - diagram of the position of a borehole in the context of the phase-lithological zones;

figure 2 - correlation diagram for the two wells.

Figure 1 schematically shows a wellbore location I, the trajectory which lies above the oil-water contact II (KSS). In areas of vertical and slanted wiring the trunk I crosses the following zones: 1 zone of sheets of mixed shale and argillaceous limestone, 2 - zone dense limestone, 3 - zone clayey limestone, 4 - zone dense limestone, 5 - zone cavernous fractured limestone, 6 - zone pseudoisotopy algal limestone, 7 - zone coral limestone.

Is the proposed method is as follows.

On previously drilled wells on the basis of preliminary information to produce a selection facies zones with a set of features that characterize each of these areas. Make reference forecast model project horizon and regulations for conducting geological studies on the supposed to the transaction well. On the basis of the received reference-forecasting models are navigation horizontal wellbore in most the e productive part oil packs.

With the specified depth intervals selected samples of rocks, which is divided into several parts, to conduct comprehensive research. One part is directed to macropsinae breed under stereomicroscope, the photographers who have documented in normal and ultravioleta radiation, conduction of carbonatite, conducting luminescent bitumen analysis. The second part is directed to conduct termovakuumnuyu degassing, the study of petrophysical parameters, determination of the content of minerals in the rock using the apparatus distillation of the liquid. The third part is left in the form of samples for detailed laboratory studies and Packed.

The data obtained are entered in the table and build the correlation scheme of geological, geotechnical studies, as well as the directional and gamma logging. On the correlation diagram for the complex of symptoms resulting from studies of sludge, define facial area exposed sediments. Based on the analysis of the correlation circuit determines the presence of a horizontal wellbore relative to the productive formation and observe the tendency of approaching the roof or sole. Take the decision to change (not change) the trajectory of the horizontal wellbore in the section.

Implementation of the proposed with the person posting the horizontal wellbore is illustrated operational conclusions on the well in the interval 3425-3564 m (figure 2). The tracking section of the sludge produced from a depth of 3150 m in the wellbore with a full range of research. After binding to the trunks of wells # 1 and # 2 fields along the roof opening greenish-gray claystone and shoes dark-gray claystone (rapper) was made a permanent change tracking lithological and petrophysical facies data in the interval 3425-3564 m in the wellbore. Integrated binding entry in a pack of 4 dense limestone is defined at a depth 3485 m (rapper), which coincided with the data of gamma logging. In the pack of 4 is allocated conditionally reservoir 3535-3540 m (marker'). Strong bituminization (50%), the increase in the gas content of the solution, tires and collector underneath. Before opening packs of 5 were obtained design data on the estimated depth of the opening packs 5 - 3569 m (reference (C) and continue drilling to a depth 3575 m By the well No. 1, the distance along the barrel from the beginning of high gotpoetry (3461 m) (the rapper In') up to the roof of packs of 5 (rapper With depth 3488 m) is 27 meters as well as the power layers are uniform in size, and before the opening of the roof of the stack 5 in well No. 2 was assumed the same power. Geologists, tracking the drilling process in real time, quickly responded to the changing breakable section. At the opening of the reservoir dense and strong limestone blaumachen good convergence curves ROP in wells # 2 and # 1 (double peak): well # 2 in the interval 3547-3551 m, and in well No. 1 - 3484-3490 m Immediately after a hearty strong limestone mechanical speed has increased dramatically and continued to grow.

In well # 2 distance from the roof conditionally productive formation (rapper', depth 3535 m) to roof packs of 5 (rapper With depth 3549 m) is 14 m, i.e. the difference in capacity is 13 m, the decrease in power of the lower part of the member 4. The drilling of the last ten meters according to the ROP and lithologic-petrographic signs pointed to the entrance to the collector. Was promptly issued a recommendation to stop drilling and flushing to the exit face of the stack. According to the results of geological studies of the sludge from the downhole tutu was concluded that the bottom part of the trunk is already in the stack 5. This information was communicated to the geological survey, where he entered the command at the termination of drilling and preparation of the GIS for the column.

1. The way of the posting of the barrel horizontal wells on the basis of geological research, including obtaining ground devices, the information from the downhole location of the drilling tool and the control trajectory posting trunk on a productive stratum, characterized in that after receiving data, at least, geotechnical investigations, survey, gamma logging, select the rock cuttings from the borehole bottom, produce integrated geological-petrophysical and lithofacial study of drilled rocks, the results of the study bring to the table lithological and petrophysical parameters and facial properties, build correlation scheme lithofacies status of the section with reference to vertical depths of identifying the most promising for oil and gas intervals and make adjustments to the trajectory posting trunk horizontal wells, providing the movement of the drilling tool in a productive reservoir.

2. The method according to claim 1, characterized in that the complex geological-petrophysical and lithofacial study drilled from the bottom rocks includes macropaedia breed under stereomicroscope, carbonatite, fluorescent bitumen analysis, photographers who have documented drilled rocks with reference to a vertical depth in normal light and UV radiation, thermal vacuum degassing, the study of petrophysical parameters, including porosity, Mineralogy, and bulk density, determination of oil or gas in the rock using the apparatus distillation of liquid.



 

Same patents:

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FIELD: orientation and navigation instruments of movable objectives.

SUBSTANCE: the inertial instrument has a gyroscope and an accelerometer installed on a hollow shaft that has ball bearing supports, rotor of the synchronous motor, raster of the optical position sensor installed on a hollow shaft, stator of the synchronous motor, radiator and a light detector of the optical position sensor installed on the instrument body. Pairs of square beams serve as the sensitive elements of the gyroscope and accelerometer, the width of the beams is essentially larger than the height, they are attached to the shaft perpendicularly to the axis of rotation in such a manner that the wider side of the beam for the gyroscope lies in the plane perpendicular to the shaft axis of rotation, and for the accelerometer the narrower side of the beam lies in the plane perpendicular to the shaft axis of rotation. The instrument also comprises two pairs of beams and two rims, the shape of additional pair of beams for the gyroscope is similar to those already available and installed on the shaft perpendicularly to those already available in such a manner that the longitudinal axes of all four beams lie in the same plane, and the narrower sides of the additional beams lie in the plane perpendicular to the axis of rotation, rigidly coupled to the gyroscope beams is rim representing a hollow cylinder, whose height equals the beam width, the additional pair of beams for the accelerometer is similar in shape to the already available ones and installed on the shaft in parallel-succession with the already available ones at a distance equal to the beam width, rigidly coupled to the accelerometer beams is a rim representing a hollow cylinder, whose height is equal to the triple width of the beam.

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19 dwg

FIELD: instrument industry.

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1 cl, 2 dwg

FIELD: navigation.

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EFFECT: enhanced precision.

3 dwg

FIELD: mechanics.

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4 dwg

Gyroscope // 2308680

FIELD: instrument industry.

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FIELD: precision instrument engineering, applicable as a component of navigation systems.

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2 cl, 7 dwg

FIELD: engineering of laser gyroscopes.

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FIELD: electrical engineering and geophysics; electrical machines feeding separate borehole navigation and geophysical instruments in studying bored oil-gas wells.

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FIELD: well drilling, particularly to control directional, horizontal and slightly rising hole making in oil mine inclines.

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2 cl, 2 dwg, 1 ex

FIELD: automatic control systems specially adapted for well drilling operations used for drilling and operation of wells, blast-holes and for other procedures.

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2 dwg

FIELD: technology for researching drill wells, in particular, for determining inclination and direction of drill well.

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2 cl, 3 dwg

FIELD: well tilt measurement, in particular, technology for determining spatial position of well borehole by means of ferro-probe tilt meter.

SUBSTANCE: tilt meter contains triads of mutually orthogonal accelerometers rigidly connected to non-magnetic body as well as triads of mutually orthogonal magnetic field strength indicators. Two indicators are mounted at an angle to longitudinal axis of body and turned relatively to plane formed by longitudinal axis of body and sensitivity axis of third indicator for angle, close to 45°. Third sensor is positioned perpendicularly to longitudinal axis of body. Such positioning of magnetometers allows increasing precision of measurements of spatial position of well borehole.

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1 dwg

FIELD: electric engineering, namely, engineering of autonomous sources of electric power for telemetry systems used during drilling of oil and gas wells with complex spatial trajectory for shaft driving.

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EFFECT: increased specific power of device when all other parameters and conditions remain the same, in particular, in constrained dimensions of drilling column.

3 dwg

FIELD: oil and gas industry, namely well drilling, particularly to determine spatial position of well bores under drilling.

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2 dwg

FIELD: wells, particularly devices to determine slope or direction of oil, gas, geothermal, iron ore and other wells included in directional well drilling systems.

SUBSTANCE: method involves measuring angular velocity by fiber-optic gyroscope and accelerometer installed on rotary panel so that the fiber-optic gyroscope and accelerometer may be installed in at least 8 positions; determining ideal sinusoid parameters, namely amplitudes and initial phases, from measured signals with the use of progressive approximation method; calculating azimuth and zenith angles from the ideal sinusoid parameters. During signal processing systematic error components of sensitive members are compensated.

EFFECT: improved operational capabilities, reduced mass, size and power inputs.

5 cl, 3 dwg

FIELD: well drilling, particularly to control well direction.

SUBSTANCE: device comprises drilling bit, downhole motor with whipstock, whipstock position measuring module, hydraulic orientator and measuring and telemetric module arranged in non-magnetic sub and connected with ground-based reception and processing complex. Whipstock position measuring module comprises body with central flushing orifice on which electrode is arranged. The electrode is located between insulators and is electrically isolated from the body. Electric circuits, measuring sensors, power source and transmission means are installed in the body. Reception and processing means are included in measuring and telemetric module so that the reception and processing means is separated from whipstock position measuring module by electric spacer and is adapted to receive electric signals from whipstock position measuring module transmitter. Accelerometers may be included in measuring sensors of whipstock position measuring module. Whipstock, whipstock position measuring module and hydraulic orientator may be connected one to another by quick-releasable connector, for instance by thread.

EFFECT: increased well quality, possibility to use flexible drilling pipes, namely coiled tubing, for well drilling.

3 cl, 2 dwg

FIELD: survey of boreholes or wells, particularly equipment to control spatial cased or uncased well position during well building.

SUBSTANCE: method involves measuring gravity acceleration projections onto measuring axes of borehole instrument, projections of Earth angular velocity onto corresponding sensitive axes of borehole instrument; measuring borehole instrument standoff angle during continuous movement and rotation thereof about longitudinal axis under the action of twisted logging cable, wherein in the first point of well path azimuth measuring the gyroscope is switched-on in angular velocity sensor mode for well azimuth determination and then gyroscope is switched to angle sensor mode and borehole instrument is switched to continuous motion mode to measure turn angles and then turn angle increment between measurements are determined; subtracting angle of gyroscope drift from Earth rotation from predetermined turn angle increment in X-direction to obtain turn angle increment in X-direction due to well path deviation; refining well path azimuth change in accordance with functional dependence obtained during inclinometer calibration with the use of testing rig; summing turn angle increment and full azimuth magnitude obtained at prior path point stop and performing continuous borehole instrument movement until turn angles reach maximal allowable values; stopping borehole instrument operation; shifting the gyroscope to angular velocity mode and repeatedly determining full well path azimuth value. Device comprises ground-based instrument connected to borehole instrument by cable. The borehole instrument comprises magneto-spherical gyroscope having angle sensors, namely sensors, which measure momentum along two measuring axes. Device also includes serially connected acceleration components generation unit and transmitting apparatus. Two control units to control mode of gyroscope operation are included in borehole instrument. The control units control gyroscope operation in X- and Y-directions and have the first and the second inputs connected to transmitting apparatus output and to control output of magneto-spherical gyroscope correspondingly. Control unit outputs are linked with data inputs of the transmitting apparatus. Each control unit comprises electronic switch, feedback voltage changer, the first and the second voltage summing units, two current sources for two coils of angle sensor, namely momentum sensor, differential amplifier, band-pass filter, phase-sensitive rectifier and integro-differential link. The first inputs of electronic switches are the first inputs of the control units, the second input of electronic switch in X-direction is linked with output of integro-differential link output in Y-direction. The second input of electronic switch in Y-direction is linked with output of integro-differential link output in X-direction. Output of electronic switch if each control unit is linked with summing units inputs through voltage changer. Outputs of summing units are connected with the first inputs of current sources having the second inputs linked with inputs of corresponding angle sensor coils. Angle sensor outputs are connected to inputs of differential amplifier having output connected to phase-sensitive rectifier input. Phase-sensitive rectifier output is connected to integro-differential link input. Phase-sensitive rectifier and integro-differential link outputs are outputs of the control unit, which controls gyroscope mode of operation.

EFFECT: increased accuracy and rate of well path measuring.

2 cl, 3 dwg

FIELD: electrical engineering; power supplied to borehole loads.

SUBSTANCE: proposed generator is characterized in that radial-axial bearing disposed at end of post on one end of stator is built of two bearings, one axial and one radial bearings, with flexible member inserted between part of frame and outer ring of one of these bearings, that additional radial bearing is installed on post at other end of stator, stuffing assembly of stator frame is disposed between end section of its movable part and post, and that it has end seal, annular cavity with radial-end collar and lubricant, as well as impeller, all mounted in tandem from additional bearing on butt-end of frame movable part.

EFFECT: enhanced reliability of generator protection against external adverse impacts.

1 cl, 2 dwg

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