CN113338831A - Method for logging well by taking core and sampling in same position - Google Patents

Abstract

The invention discloses a method for logging by taking core and sampling in situ, which comprises the steps of lowering an underground instrument to a target layer, and determining a first point position on a well wall; performing one of the two operation contents of coring and sampling on the first point location; and performing another operation content on the first point. The invention relates to the field of well logging, and provides an in-situ coring sampling well logging method, which can realize an in-situ coring sampling technology, namely coring and sampling points are positioned at the same depth and the same direction, the obtained fluid is purer, and the obtained stratum real objects can be mutually proved.

Description

Method for logging well by taking core and sampling in same position

Technical Field

The invention relates to the field of well logging, in particular to an orthotopic coring sampling well logging method.

Background

The stratum testing and sampling technology and the stratum borehole wall coring technology are two important well logging technologies in exploration and development, are core technologies of exploration and development of complex oil and gas reservoirs, can quickly and directly identify and evaluate the complex oil and gas reservoirs, improve exploration finding rate, and are indispensable technologies for accurately evaluating reservoirs.

Under the prior art system, the well wall coring and the stratum testing belong to two different well logging sequences, two series of instruments which are completely incompatible are required to be used for completing two series of well logging operations, and the instruments need to be lifted and lowered for many times, so that the operation service process has long time of occupying a platform wellhead, the risk of sticking and clamping of the underground instruments is increased, the operation strength is high, and particularly in the deep water field, the factors cause the operation thrust to rise greatly. The pressure measurement sampling is used as secondary operation, the time spent in the operation is long, when coring is needed, the formation characteristics change along with the change of time, the obtained rock core cannot effectively reflect the real formation characteristics, and the formation needs to be evaluated according to a large amount of data of cable testing and data of well drilling and logging. When different series of wells are put down for multiple times, the cores and formation fluids with the same detection degree are difficult to obtain, and the underground posture of the instrument cannot be guaranteed, so that the cores and the formation fluids at the same point can not be obtained at present.

Disclosure of Invention

The embodiment of the invention provides an orthotopic coring sampling well logging method, which comprises the following steps:

lowering the downhole instrument to a target layer, and determining a first point position on a well wall;

performing one of the two operation contents of coring and sampling on the first point location;

and performing another operation content on the first point.

In one possible design, the length of the downhole tool is adjusted in the wellbore before another operation is performed on the first point, so that a module of the downhole tool performing another operation corresponds to the first point.

One possible design is to center the downhole tool in the wellbore before adjusting the length of the downhole tool in the wellbore.

One possible design would be to push the downhole tool against the borehole wall before coring and sampling.

One possible design would be to first sample the first point, shorten the instrument length in the wellbore, and then core the first point.

In one possible design, the downhole tool probe module seats the borehole wall for pre-testing, pressure measurement, and then pumping formation fluids during sampling.

According to one possible design, after another operation content is carried out on the first point, the length of the underground instrument is adjusted again, N second point positions are determined on the well wall in sequence, and coring and sampling are carried out on the N second point positions.

The method for logging by using the homotopic coring sampling can realize the homotopic coring sampling technology, namely, coring and sampling points are positioned at the same depth and the same direction, the obtained fluid is purer, and the obtained stratum real objects can be mutually proved.

According to the method for logging by using the homotopic coring sampling, sampling and coring are completed by one-time well descending, so that the well head occupation time is reduced, the operation cost is saved, and the operation safety is greatly improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic diagram of the steps of a method for in-situ coring sampling well logging according to an embodiment of the present invention;

FIG. 2 is a first schematic diagram of a logging system according to an embodiment of the invention;

FIG. 3 is a second schematic diagram of a logging system according to an embodiment of the invention;

FIG. 4 is a schematic view of a first sub in FIG. 1;

FIG. 5 is a schematic diagram of an upper section of the first sub of FIG. 4 in a receiving state;

FIG. 6 is a schematic drawing of a mid-section of the first sub of FIG. 4 in a retracted state;

FIG. 7 is a schematic diagram of a lower section of the first sub in a retracted state in FIG. 4;

FIG. 8 is a schematic illustration of the substrate of FIG. 4;

FIG. 9 is a first fragmentary schematic view of the first sub of FIG. 4;

FIG. 10 is a second fragmentary view of the first sub of FIG. 4;

FIG. 11 is a fragmentary view of the base of FIG. 8;

FIG. 12 is a schematic sectional view taken along line A-A in FIG. 11;

FIG. 13 is a schematic view of the coring module of FIG. 4 in a drill state;

FIG. 14 is a schematic diagram of the coring module of FIG. 4 shown disassembled;

FIG. 15 is a schematic view of a coring state of the coring module of FIG. 4;

FIG. 16 is a schematic view of the support module of FIG. 4;

FIG. 17 is a schematic view of the downhole tool of FIG. 2 in a sample state;

FIG. 18 is a schematic illustration of the downhole tool coring condition of FIG. 2;

FIG. 19 is a schematic diagram of a method for performing an in-situ coring well logging in accordance with another embodiment of the present invention;

FIG. 20 is a schematic illustration of a downhole tool operation according to yet another embodiment of the present invention.

Reference numerals: 100-base body, 101-upper joint, 102-mounting groove, 103-lower joint, 104-second mounting cavity, 105-first mounting cavity, 106-mounting notch, 107-hydraulic control section, 108-probe section, 109-coring section, 110-first hydraulic cavity, 111-second hydraulic cavity, 112-base body suction section, 113-first channel, 114-second channel, 115-special-shaped end cover, 116-connecting channel, 117-branch channel, 118-sampling channel, 119-first unfreezing pushing arm, 120-upper pushing arm, 121-second unfreezing pushing arm, 122-auxiliary pushing arm, 200-probe module, 201-probe, 202-hydraulic cylinder, 203-suction channel, 204-retracting hydraulic cylinder, 205-first piston, 205-second piston pushing arm, 206-second piston, 300-coring module, 301-drill bit, 302-motor component, 303-cable, 304-drilling rod, 305-push rod, 306-spacer mechanism, 307-core storage barrel, 308-fixing plate, 309-sliding plate, 310-second beam, 311-core-folding reset component, 312-first beam, 313-guide rail groove, 314-slider, 315-convex column, 316-mounting shaft, 317-cable joint, 400-hydraulic integrated mechanism, 500-first short section, 600-telescopic module, 700-support module, 701-support arm, 800-ground equipment, 801-system bus, 900-downhole instrument, 901-control module, 902-detection module, 903-drive module, 904-push against assembly, 905-sample suction analysis module.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The current pressure measurement and sampling operation takes long time, when coring is needed, the formation characteristics change along with the change of time, and the obtained rock core can not effectively reflect the real formation characteristics. In the existing situation, when different series of wells are repeatedly drilled, cores and formation fluids with the same depth are difficult to obtain, and the underground postures of the instrument cannot be guaranteed, so that no homotopic coring sampling well logging technology exists at present.

Referring to fig. 1 to 18, a method for performing an orthotopic sampling well logging according to an embodiment of the present invention includes: and (3) lowering the downhole instrument 900 to a target layer, determining a first point on the well wall, then performing one of two operation contents of coring and sampling on the first point, and then performing the other operation content on the first point to finish the logging process. Therefore, the logging method can realize an in-situ coring sampling technology, namely coring and sampling points are positioned at the same depth and the same direction, the obtained fluid is purer, and the obtained stratum real objects can be mutually proved.

The method mainly comprises two operation contents, namely sampling and coring, wherein the sequence of the two operation contents can be reversed, and the length of the downhole instrument 900 needs to be adjusted in a shaft in the time period between the two operation contents, so that a module for performing the later operation contents corresponds to a first point position. Before adjusting the length of the downhole tool 900 in the wellbore, the downhole tool 900 needs to be centered in the wellbore to stably extend and retract.

The method for performing the above-mentioned in-situ coring sampling well logging needs to rely on the well logging system shown in fig. 2 to 18, which includes a downhole tool 900 capable of being lowered into a wellbore, the downhole tool 900 includes a control module 901, a support module 700, a telescopic module 600, a coring module 300, and a probe module 200, wherein the coring module 300 and the probe module 200 are integrated on a first sub 500 for coring and setting the wall of the wellbore. The probe module 200 and the coring module 300 are vertically arranged in the length direction of the first short section 500 and are arranged in the circumferential direction of the first short section 500 in an identical position. In addition, a pushing assembly 904 is provided on the first sub 500 for pushing the downhole tool 900 against the borehole wall. The support module 700 is configured to position the downhole tool 900 in a depth direction of the wellbore. The telescopic module 600 is arranged to be telescopic along the depth direction of the shaft so as to lift or lower the first short section 500. The control module 901 is configured to control the actions of the support module 700, the telescoping module 600, the coring module 300, the probe module 200, and the pushing assembly 904. Therefore, the downhole instrument of the logging system integrates functional modules required by coring and sampling, coring and sampling can be completed by one-time downhole, the length of the downhole instrument is obviously shortened compared with that of the conventional instrument, the operation cost is saved, and meanwhile, the operation safety is greatly improved.

As shown in fig. 2 and 3, the logging system further includes surface equipment 800, and the surface equipment 800 is located on the surface and connected to the control module 901 through a system bus 801 to supply power to the downhole tool 900 and communicate with the downhole tool 900. The surface equipment 800 has processing software which can be responsible for decoding processing of downhole information and modulation and transmission of surface commands, and the surface equipment 800 has a display screen and an operation panel which can display downhole information and issue surface commands. The system bus 801 is responsible for the transmission of downhole information and command information. The downhole instrument 900 also includes a sample pump analysis module 905, the sample pump analysis module 905 being disposed in communication with the probe module 200 through the sampling passage 118 for pumping and analyzing fluids of the formation. Additionally, the downhole tool 900 has a detection module 902, the detection module 902 including a plurality of sensors that detect the status of each module. The control module 901 may be responsible for collecting and packaging signals of downhole sensors and sending the signals to the surface equipment 800, and may also send commands to the surface equipment down and execute the commands. Meanwhile, the downhole instrument 900 comprises a driving module 903, the control module 901 is electrically connected with the driving module 903 to control the driving module 903 to act, and the output end of the driving module 903 is respectively connected with the supporting module 700, the telescopic module 600, the coring module 300, the probe module 200 and the pushing assembly 904 to provide power. Therefore, the control module 901 can send a signal to the driving module 903, and the driving module 903 can drive the corresponding module according to the received signal, so that the control module 901 can control the actions of other modules.

First, the downhole tool 900 is typically made up of several sub-sections connected together, which serve as the base unit for the downhole tool, and the modules described above are also provided on the respective sub-sections, as for the first sub 500, on which the functional modules for coring and sampling are integrated, as shown in fig. 3 to 6, the first nipple 500 has a base body 100 integrally formed, and a probe module 200, a coring module 300 and a hydraulic integration mechanism 400 mounted on the base 100, wherein the hydraulic integrated mechanism 400, the probe module 200 and the coring module 300 are sequentially arranged from top to bottom, the hydraulic integrated mechanism 400 is used as one of the components of the driving module 903, the output end of the hydraulic integrated mechanism 400 is respectively connected with the probe module 200 and the coring module 300, the hydraulic integration mechanism 400 is configured to provide power for extension and retraction of the probe module 200, as well as for movement, inversion, and coring of the coring module 300. From this, this first nipple joint will be got probe module 200 integration of module 300 and sample usefulness on a nipple joint, and it can cover most reservoir thickness, can shorten the length of instrument in the pit again by a wide margin, reduce cost, the security improves. The substrate 100 cannot be further separated in the longitudinal direction. As shown in fig. 4 and 5, the base body 100 includes a hydraulic control section 107, a probe section 108, and a core section 109, which are connected in sequence, and the hydraulic control section 107, the probe section 108, and the core section 109 are respectively provided with a first installation cavity 105, an installation cavity 102, and a second installation cavity 104, which can provide installation spaces for a hydraulic integrated mechanism 400, a core module 300, and the like. In addition, the first installation cavity 105 and the second installation cavity 104 are provided with openings, the base body 100 is provided with a detachable cover plate corresponding to the respective openings, the openings are closed, and the outer surface of the cover plate can be matched with the surface of the base body 100, so that the whole short section is cylindrical. For connecting with other short joints, the top end of the pilot section 107 is provided with an upper joint 101, and the bottom end of the coring section 109 is provided with a lower joint 103.

The mounting groove 102 extends in the axial direction of the base 100, vertically penetrates the probe segment 108, and communicates the first mounting cavity 105 and the second mounting cavity 104. As shown in fig. 9 to 12, the probe module 200 is mounted on the probe segment 108, the probe module 200 includes a probe 201 and a driving structure, wherein the driving structure is mounted on the probe segment 108, an output end of the driving structure is connected with the probe 200, the substrate 100 is provided with a mounting notch 106 corresponding to the probe 201, and the mounting notch 106 matches with an outer shape of the probe 201, so that the probe 200 can be embedded into the substrate 100 in a retracted state. The driving structure avoids the installation groove 102 and an oil path or a fluid path arranged on the probe section 108, and comprises two hydraulic driving assemblies which are respectively and correspondingly arranged on two sides of the installation groove 102. Any hydraulic drive assembly includes two extension cylinders 202 and one retraction cylinder 204, but is not limited to such, and may include more than two extension cylinders 202 and more than one retraction cylinder 204. The two hydraulic drive assemblies are arranged correspondingly, and the respective extending hydraulic cylinder 202 and retracting hydraulic cylinder 204 are also corresponding, wherein the two extending hydraulic cylinders 202 of any hydraulic drive assembly are arranged along the length direction of the probe 201 and are respectively positioned at two ends of the substrate 100 in the axial direction, and one retracting hydraulic cylinder 204 is arranged on the probe 201 in the center. The extension cylinder 202 and the retraction cylinder 204 are in communication with the hydraulic integration mechanism 400 via oil passages to control the actuation of the extension cylinder 202 and the retraction cylinder 204 via the hydraulic integration mechanism 400, the extension cylinder 202 can push the probe 201 outward against the wall of the borehole, and the retraction cylinder 204 can pull the extended probe 201 back toward the substrate 100.

Unlike the existing probe structure, as shown in fig. 11 and 12, the extension cylinder 202 is a single-acting cylinder, which can only act to extend the probe, and compared with the existing double-acting cylinder, the extension cylinder has longer extension length and larger application range under the same size specification, and is more advantageous for integration. Each outward extending hydraulic cylinder 202 comprises a first hydraulic cavity 110 and a first piston 205, wherein one end of the first piston 205 extends into the first hydraulic cavity 110, the other end of the first piston is in threaded connection with the probe 201, the first hydraulic cavity 110 close to the hydraulic integrated mechanism 400 is communicated to the hydraulic integrated mechanism 400 through a second channel 114, the second channel 114 is a branch of an oil path to supply oil to the two first hydraulic cavities 110 close to the hydraulic integrated mechanism 400, and an oil outlet of the second channel 114 is located on the cavity wall of the first hydraulic cavity 110 far away from the probe 201; and two first hydraulic pressure chambers 110 of a hydraulic drive assembly are communicated through the first channel 113, so that two overhanging hydraulic cylinders 202 of a hydraulic drive assembly can synchronously act, the action consistency is ensured, and the total four overhanging hydraulic cylinders 202 can simultaneously act on the probe 201 and synchronously extend out, thereby avoiding the probe 201 from deviating and being incapable of clinging to the well wall due to asynchronous action. In addition, the base body 100 is further provided with a detachably connected special-shaped end cover 115, the special-shaped end cover 115 is installed on one side of the base body 100, which faces away from the probe 201, and corresponds to the probe 201, the first channel 113 comprises a connecting channel 116 arranged on the special-shaped end cover 115, and a branch channel 117 which is located on the base body and communicates the connecting channel 116 with the first hydraulic cavity 110, and the two branch channels 117 are respectively and correspondingly arranged at two ends of the connecting channel 116.

As shown in fig. 10 to 11, the retracting cylinder 204 is also a single-acting cylinder, which can only act to retract the probe 201, and the retracting cylinder 204 includes a second hydraulic chamber 111 disposed on the substrate 100, and a second piston 206, wherein one end of the second piston 206 extends into the second hydraulic chamber 111, and the other end is in threaded connection with the probe 201, the second hydraulic chamber 111 is communicated to the hydraulic integration mechanism 400 through a third passage (not shown), the third passage is also a branch of an oil path to supply oil to the second hydraulic chamber 111, and an oil outlet of the third passage is located on a wall of the second hydraulic chamber 111 close to the probe 201. The probe 201 communicates with a sampling channel 118 in the base body 100 through a retractable suction channel 203, the sampling channel 118 extending upward in the base body 100, penetrating the pilot section 107, and communicating with a sampling suction analysis module 905 in the other sub located on the upper side of the first sub 500. In order to ensure sealing, sealing rings can be arranged at the joints of the piston and each oil way and channel to ensure that fluid does not leak.

The hydraulic integration mechanism 400 may employ a plurality of integrated pilot operated valves that hydraulically control a plurality of components, including the extension cylinder 202 and the retraction cylinder 204 described above. Therefore, when sampling is needed, the hydraulic integrated mechanism 400 can control the four outward extending hydraulic cylinders 202 to act (i.e. the outward extending hydraulic cylinders 202 supply hydraulic oil), the first piston 205 extends, the probe 201 is pushed to move towards the well wall by uniform action until the probe moves to the position, and meanwhile, the hydraulic oil retracted into the hydraulic cylinder 204 is discharged; when the probe 201 needs to be retracted, the hydraulic integrated mechanism 400 can control the two retracting hydraulic cylinders 204 to act (i.e., supply hydraulic oil to the retracting hydraulic cylinders 204), the second piston 206 is retracted into the second hydraulic cavity 111, and pulls the probe 201 away from the well wall until the probe retracts to the substrate 100, and in the process, the hydraulic oil in the extending hydraulic cylinder 202 is also discharged. Furthermore, as shown in fig. 5-10, the output of the hydraulic integration mechanism 400 is also provided with a push-core drilling assembly that extends through the probe section 108 and connects to the coring module 300, and the hydraulic integration mechanism 400 is provided with a downwardly extending cable 303, the cable 303 connecting to the coring module 300, the cable 303 also extending through the probe section 108.

As shown in fig. 7, 9 and 10, the core drilling assembly and the cable 303 are installed in the installation groove 102 and penetrate through the installation groove 102, so that a probe structure is avoided, and the integration of the core drilling and the probe structure is realized. The coring module 300 described above includes a coring apparatus, a core barrel 307, and a spacer mechanism 306, the core barrel 307 being disposed on the underside of the coring apparatus, the spacer mechanism 306 being on one side of the core barrel 307 to provide a spacer for cores entering the core barrel 307 to separate adjacent cores.

As shown in fig. 13 to 15, the coring apparatus is a conventional rotary sidewall coring apparatus, and includes a drill 301, a motor assembly 302, a fixing plate 308, a sliding plate 309, a core-breaking resetting assembly 311, and other components for moving and turning over the coring apparatus. Wherein, the drill bit 301 is installed at the output end of the motor assembly 302 and driven by the motor assembly 302, and the motor assembly 302 is provided with a cable connector 317 which is connected with a cable 303 to ensure the power supply of the motor assembly 302. Although the core-pushing drilling assembly can only move axially, the motor assembly 302 can be pushed to perform turning, moving and core-folding actions, which need to be realized by matching the components such as the fixed plate 308, the sliding plate 309, the core-folding resetting assembly 311, and the like.

The reversing operation refers to a process in which the motor unit 302 is changed from a state in which the axial direction of the drill 301 is parallel to the axis of the base 100 to a state in which the axial direction of the drill 301 is perpendicular to the axis of the base 100, or the motor unit 302 is changed from a state in which the axial direction of the drill 301 is perpendicular to the axis of the base 100 to a state in which the axial direction of the drill 301 is parallel to the axis of the base 100, that is, the state in fig. 12 and the state in fig. 14 are switched to each other. When the axial direction of the drill bit 301 is vertical to the axial direction of the base body 100, the drill bit 301 is opposite to the well wall, and the motor assembly 302 can be moved towards the well wall to drill a rock core in the state; when the axis of the drill bit 301 is parallel to the axis of the base 100, the axis of the drill bit 301 is collinear with the axis of the push rod 305, and the push rod 305 moves through the drill bit 301 to push the core being taken down towards the core barrel 306. The moving action refers to that when the drill bit 301 is opposite to the well wall, the motor assembly 302 and the drill bit 301 move towards the well wall or away from the well wall together, namely, drilling and retreating are carried out. The core folding action is that the motor assembly 302 slightly (for example, a set angle, which may be 3 to 5 degrees) swings around the mounting shaft 316 of the slider 314 and the motor assembly.

The above-described push-core drilling assembly includes a drill rod 304 and a push rod 305 arranged in parallel, both the drill rod 304 and the push rod 305 being arranged parallel to the axis of the base body 100 and both being slidable in the axial direction of the base body 100. One end of the drilling rod 304 is connected to the output end of the hydraulic integrated mechanism 400, and the other end is connected to a second cross beam 310, so as to drive the sliding plate 309 to slide along the axial direction of the base body 100, and transmit power for turning, moving and bending. One end of the push rod 305 is also connected to the output end of the hydraulic integrated mechanism 400, and the other end corresponds to the inlet of the core barrel 307.

As further shown in fig. 4 and 8, the coring apparatus is co-located with the probe in the circumferential direction of the substrate 100, i.e., the drill bit 301 and the probe 201 are positioned directly above the drill bit 301 when the probe 201 and the drill bit 301 are extended out of the substrate 100, such that the borehole wall sampling location is directly above the borehole wall coring location. Through the integrated layout, the distance between the coring device and the probe 301 in the length direction of the substrate 100 is the first distance which is smaller than 600mm, the distance can be controlled to be 488mm in the example, and the occupied length is shortened as much as possible. As shown in fig. 4 to 6, the base 100 is provided with an upper pushing arm 120 and a secondary pushing arm 122, the upper pushing arm 120 and the secondary pushing arm 122 form a pushing assembly 904, the upper pushing arm 120 is located on the upper side of the probe module 200, on the hydraulic control section 107, and is on the side facing away from the probe 201; the secondary abutment arm 122 is arranged on the lower side of the coring apparatus, on the coring section 109, also on the side facing away from the probe 301; the input ends of the upper and auxiliary pushing arms 120 and 122 are respectively communicated with the hydraulic integrated mechanism 400 through oil passages, and respectively extend and unfold under the action of hydraulic pressure, so that the base body is pushed to abut against the well wall. In addition, the base 100 is further provided with two unlocking pushing arms, the number of the unlocking pushing arms is not limited to two, and may be one or more than two, the two unlocking pushing arms are respectively a first unlocking pushing arm 119 and a second unlocking pushing arm 121, the first unlocking pushing arm 119 is located on the upper side of the probe 201, the second unlocking pushing arm 121 is located on the lower side of the coring apparatus, the first unlocking pushing arm 119 and the second unlocking pushing arm 121 are both located on the side of the base 100 where the probe 201 is located, and the first unlocking pushing arm 119 and the second unlocking pushing arm 121 are both connected to the hydraulic integration mechanism 400 and can extend and retract under the control of the hydraulic integration mechanism 400. Thus, as shown in fig. 4 to 6, the first sub is in a retracted state in which the probe 201, the drill 301, the upper backup arm 120, the sub backup arm 122, and the like are all retracted into the substrate 100, and the probe 201, the drill 301, the upper backup arm 120, the sub backup arm 122, and the like are all extended out of the substrate 100, i.e., an expanded state of the first sub. The extension and retraction of the probe 201, the drill 301, the upper backup arm 120, the sub backup arm 122, and the like are driven and controlled by the hydraulically integrated mechanism 400.

As shown in fig. 2 and 3, the supporting module 700, the telescopic module 600, and the first short section 500 are sequentially disposed from top to bottom, and oil paths, fluid channels, and cable lines are disposed in the supporting module 700 and the telescopic module 600, so that hydraulic control, power supply, fluid transmission, and information transmission are not affected. As shown in fig. 16, the support module 700 has four support arms 701 with different directions, the support arms 701 can extend and retract in the radial direction of the wellbore, and the support arms 701 are arranged in the circumferential direction and can be pressed against the wellbore wall, so that the downhole tool 900 is fixed in the depth direction of the wellbore (the axial direction of the downhole tool), and the downhole tool 900 is also centered in the wellbore. This flexible module 600 can be followed the accurate flexible of axial to can self locking, in order to reach the purpose of this first nipple joint 500 length of change, it can independently stretch out and draw back 500mm at least.

The sensors of the downhole tool may respectively detect the following parameters: the state of the support module (i.e., the displacement information and compression of the support arm 701), the state of the drive module (i.e., the driven target module), the state of the push assembly (i.e., the push assembly deployed and retracted), the state of the probe module (i.e., the displacement information and compression of the probe 201), the state of the coring module (i.e., what degree the coring process is), the state of the telescoping module (i.e., the telescoping length and locking of the telescoping module), the pressure information of the destination layer (fluid pressure is tested at the probe 201), and the volume and properties of the formation fluid. Each sensor is a common component of a downhole tool, for example, the plurality of sensors includes at least one first sensor and a second sensor disposed corresponding to the support module 700, and the first sensor and the second sensor may monitor displacement information and pressure information of the support arm 701, respectively.

As shown in figure 1, the logging method mainly comprises the steps of lowering, sampling, shortening, aligning and coring in sequence, and before coring and sampling, a downhole instrument is pushed against a well wall. Specifically, the downhole tool is first lowered and the surface lifting device lowers the downhole tool 900 to the destination zone. Subsequently setting the probe, giving a logging command under the ground, sending a setting signal to the driving module by the control module, driving the pushing component to expand and extend the probe by the driving module according to the setting signal, namely controlling the pushing component and the probe module to act, so that the probe module sets the well wall, determining a sampling position, namely a first point position (H point), and at the moment, enabling the drill bit to be retracted in the matrix and not to extend. And then pumping the fluid, sending a setting in-place signal to the control module after the sensor for monitoring the state of the probe module detects that the probe module is in place, sending a sampling signal to the driving module by the control module according to the setting in-place signal, and starting pre-testing, pressure measurement, pumping and analyzing the formation fluid by the sampling pumping and analyzing module, namely sampling at the point H by the sampling pumping and analyzing module. And then the downhole instrument 900 is positioned in the middle, when the sensor detects that the formation fluid with the preset volume is pumped, the control module sends a mode switching signal to the driving module after receiving a sampling completion signal sent by the sensor, the driving module drives the sampling pumping analysis module to stop according to the signal, drives the pushing component and the probe to retract, and simultaneously drives the supporting arm to expand to start positioning the downhole instrument, namely, controls to stop sampling, release the setting well wall and position the downhole instrument. Next, the downhole instrument 900 is shortened, when the sensor detects that the support module completes positioning, a positioning completion signal is sent to the control module, the control module sends a lifting signal to the drive module according to the positioning completion signal, the drive module drives the telescopic module to shorten a preset distance and then lock, the preset distance is equal to the first distance, so that the first short section 500 is lifted up to enable the coring module to correspond to a sampling position, namely, the drill bit 301 corresponds to a first point position (H point). And when the locking of the telescopic module is detected, the control module sends a pushing signal to the driving module, the driving module drives the supporting arm to retract, the positioning is released, and the pushing assembly is driven to expand again, so that the downhole instrument is pushed against the well wall. And (3) starting coring, when the sensor detects that the pushing assembly is unfolded in place, the control module sends a coring signal to the driving module, and the driving module drives the coring module to drill, core folding, core identification, drill withdrawal and core pushing, as shown in fig. 18, so as to obtain the core at the first point position (point H) of the obtained formation fluid. And finally, when the sensor detects that the rock core is obtained, namely enough rock core is obtained, the controllable module sends a pushing removal signal to the driving module, the driving module drives the pushing assembly to retract, the constraint between the downhole instrument and the well wall is released, and the well logging is finished.

In another exemplary embodiment, as shown in FIG. 19, the logging method may also be sequentially run, cored, extended and registered, and sampled. Specifically, the downhole tool is lowered first, and the hoisting equipment on the ground lowers the downhole tool to the target layer. Then pushing against the well wall, sending a logging command from the ground, sending a pushing signal to the driving module by the control module, driving the supporting arm to retract by the driving module, releasing the positioning, and driving the pushing assembly to expand so as to enable the underground instrument to be pushed against the well wall. Subsequently, when the sensor detects that the pushing assembly is unfolded in place, the control module sends a coring signal to the driving module, and the driving module drives the coring module to perform drilling, core folding, core identification, drilling withdrawal and core pushing, as shown in fig. 18, so as to obtain a core at a first point (point H), namely a coring position, or a coring point. And then positioning the downhole instrument, when the sensor detects that the rock core is obtained, namely enough rock core is obtained, the control module sends a pushing and releasing signal to the driving module, the driving module drives the pushing and releasing assembly to retract, the coring module resets and stops working, and meanwhile, the supporting arm is driven to expand to start positioning the downhole instrument. Then extend instrument in the pit, when the sensor detects the support module and accomplishes the location, send the location to control module and accomplish the signal, this control module is accomplished the signal according to the location and is sent down the signal to drive module, this drive module drive flexible module extension is locked after the preset distance, this preset distance equals first interval, realizes transferring first nipple joint and makes the probe correspond the coring position, and the probe corresponds first position (H point) promptly. And after the probe is set, when the locking of the telescopic module is detected, the control module sends a setting signal to the driving module, the driving module drives the supporting arm to retract, the positioning is released, the pushing assembly and the probe module are driven to expand, so that the underground instrument is pushed against the well wall, namely, the pushing assembly and the probe module are controlled to act, the probe module is enabled to set the well wall, as shown in fig. 17, the sampling position, namely, the first point position (point H), is determined, and the sampling and coring are realized at the same point position. And then pumping formation fluid, sending a setting in-place signal to the control module after the sensor for monitoring the state of the probe module detects that the probe module is in place, sending a sampling signal to the driving module by the control module according to the setting in-place signal, and starting pre-testing, pressure measurement, pumping and analyzing the formation fluid by the sampling pumping and analyzing module, namely controlling the sampling pumping and analyzing module to sample at a first point position (point H). And finally, finishing logging, when the sensor detects that the formation fluid with the preset volume is pumped, sending a setting releasing signal to the driving module after the control module receives a sampling finishing signal sent by the sensor, driving the sampling pumping analysis module to stop by the driving module according to the signal, driving the pushing component and the probe to retract, releasing the constraint between the downhole instrument and the well wall, and finishing logging.

Therefore, whether coring is carried out first and then sampling is carried out, or sampling is carried out first and then coring is carried out, the logging system and the control scheme thereof can realize that undamaged fluid and rock core are obtained, obtained stratum material objects can be mutually proved, and the calculation precision of the permeability and the porosity is improved. Notably, if coring and sampling are performed first, the probe during sampling is set on the hole formed on the well wall during coring, the hole is closed, and then fluid is pumped, so that formation fluid is obtained more directly and more easily, and in addition, the influence of the fixed blocking belt on sampling is removed. If sampling is carried out before coring, the fluid at the first point is always pumped and discharged during sampling, namely, the well wall at the first point is cleaned, the clean well wall is subjected to coring, and the purity of the obtained core is higher.

In another exemplary embodiment, after sampling and coring the first point location (point H), adjusting the length of the downhole tool again, centering the downhole tool, extending the telescoping module so that the first sub moves down, as shown in fig. 20, to define a second point location (point M) at the borehole wall, which is below point H, and then sampling and coring the second point location (point M). The second point location (point M) is not limited to extending the telescoping module, such as shortening the telescoping module, when the second point location (point H) is above the first point location (point H). And the sampling and coring are performed on a plurality of second point locations, so that a plurality of times of orthotopic coring sampling are realized.

By combining the embodiments, the method for logging by taking a core in an apposition manner in the embodiments of the present invention can realize an apposition core sampling technique, that is, the core and sampling points are located at the same depth and the same direction, so that the obtained fluids are purer, and the obtained formation real objects can be mutually adjudicated. According to the method for logging by using the homotopic coring sampling, sampling and coring are completed by one-time well descending, so that the well head occupation time is reduced, the operation cost is saved, and the operation safety is greatly improved.

In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" structure ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the structures referred to have specific orientations, are configured and operated in specific orientations, and thus, are not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, or may be connected through two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

1. An in-situ coring sampling logging method, comprising:

lowering the downhole instrument to a target layer, and determining a first point position on a well wall;

performing one of the two operation contents of coring and sampling on the first point location;

and performing another operation content on the first point.

2. The method of claim 1, wherein the length of the downhole tool is adjusted in the wellbore before performing another operation on the first point, such that the module of the downhole tool performing the another operation corresponds to the first point.

3. The method of claim 2, wherein the downhole tool is centered in the wellbore prior to adjusting the length of the downhole tool in the wellbore.

4. The method of claim 3, wherein the downhole tool is pushed against the borehole wall prior to coring and sampling.

5. The method of claim 2, wherein the first point is sampled, the length of the tool is shortened in the wellbore, and the first point is cored.

6. The method of claim 5, wherein the downhole tool probe module seats against the borehole wall during sampling, pre-testing, pressure testing, and pumping formation fluids.

7. The method of claim 3, wherein after performing another operation on the first point, the length of the downhole tool is adjusted again, and N second points are sequentially determined on the borehole wall and are cored and sampled.

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