CN115559717A - Formation fluid sampling while drilling and fluid online mapping tool - Google Patents

Abstract

The invention provides a formation fluid sampling while drilling and fluid online surveying and mapping tool, which comprises a ground control system, a data acquisition system and a data processing system, wherein the ground control system sends a control instruction to the underground; and a downhole portion comprising: the underground control assembly receives a control command of the ground control system and controls sampling and online surveying and mapping; a sampling assembly configured to take a formation sample; the power system provides power for the extension and the suction sampling of the sampling assembly; a tank assembly for storing qualified formation samples; the pollution rate evaluation assembly is used for judging whether the pollution rate of the stratum sample is qualified or not, discharging the unqualified stratum sample and conveying the qualified stratum sample into the storage tank assembly; and a fluid parameter measurement assembly that measures a parameter of the formation sample within the tank assembly and feeds back the measured data to the surface control system.

Description

Formation fluid sampling while drilling and fluid on-line surveying and mapping tool

Technical Field

The invention relates to a while-drilling formation fluid sampling and fluid online mapping tool, and belongs to the field of petroleum and natural gas drilling formation fluid sampling.

Background

The method has the advantages that the geological parameters such as the type and the property of the fluid are obtained by collecting representative stratum fluid samples, and the method has very important significance for accurately determining the oil-gas containing condition of a reservoir and reasonably making a long-term development scheme in an oil-gas field.

At present, formation fluid is obtained mainly by putting a cable sampler into the tool, and the working principle of the cable formation sampling tool is to press a small cushion layer probe on a well wall, reduce the pressure in the probe to be enough to break the mud cake seal, extract fluid from the formation and place the fluid into a sealable sampling chamber. The composition of this sample chamber is then analysed at the surface to determine the hydrocarbon content.

The cable fluid sampling technology has early development time and mature technology, but the operation of the cable fluid sampling technology occupies a longer time of a drilling machine, the instrument is easy to stick and clamp due to non-circulation of slurry in the sampling process, and the problems of difficult instrument descending and the like exist in highly-deviated wells, horizontal wells and large-displacement wells. In addition, the cable fluid sampling is post-drilling sampling, the stratum is opened for a long time, and the stratum near the well wall is easily polluted by mud. Formation fluid is taken out for analysis in a laboratory by adopting a formation testing technology, errors are often generated, the real component data of the formation fluid are difficult to obtain, and higher cost and time are spent.

In the cable type underground formation fluid sampling device in the prior art, a formation fluid sample is stored through a sampling cylinder, and a fluid pipeline between the sampling cylinder and a sampling unit is opened or closed through a one-way valve, so that the sampling function is realized, and the whole system is regulated and controlled by a control part. This patent provides a cable sampling tool, does not possess the sample function while drilling, and can not survey and draw fluid performance parameter on line.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a formation fluid sampling while drilling and on-line fluid mapping tool, which can sample formation fluid while drilling through a sampling instruction sent from the ground, carry out on-line measurement on the pollution rate of the formation fluid and store the formation fluid meeting the requirements into a sample tank. Meanwhile, the tool provided by the invention also realizes online mapping of the properties of the formation fluid and transmits the mapping to the ground.

The invention provides a formation fluid sampling while drilling and fluid on-line mapping tool, which comprises:

the ground control system sends a control command to the underground at the ground; and

a downhole portion comprising:

an outer casing for the housing of the device,

the underground control assembly receives a control instruction of the ground control system and controls sampling and online surveying and mapping;

a sampling assembly configured to take a formation sample;

the power system is used for providing power for the extension and the suction sampling of the sampling assembly;

a tank assembly for storing qualified formation samples;

the pollution rate evaluation assembly is used for judging whether the pollution rate of the stratum sample is qualified or not, discharging the unqualified stratum sample and conveying the qualified stratum sample into the storage tank assembly; and

and the fluid parameter measuring assembly is used for measuring the parameters of the formation sample in the storage tank assembly and feeding the measured data back to the surface control system.

A further improvement of the invention is that the outer housing includes a body for mounting a power system; the upper end of the body is provided with an instrument cabin shell and an upper shell which are used for installing an underground control assembly; the lower end of the body is provided with a sampling drill collar for mounting a sampling assembly; and the lower end of the sampling drill collar is provided with a sample measuring drill collar for mounting a fluid parameter measuring component.

The invention is further improved in that a power supply assembly is arranged in the instrument cabin shell, and the power supply assembly comprises a rectification voltage-stabilizing circuit, a master control circuit, a pushing driving circuit, a suction driving circuit and an electromagnetic valve control circuit.

A further improvement of the present invention is that the power system includes a power assembly for powering the extension and retraction of the sampling assembly, and a pumping assembly for powering the pumping of the formation sample by the sampling assembly.

The sampling drill collar is further improved in that a spiral wing with the outer diameter slightly smaller than the diameter of a borehole is arranged on the sampling drill collar, and a through hole groove for mounting a sampling assembly is formed in the spiral wing.

The invention has the further improvement that the sampling component comprises a probe assembly, a filter is arranged on the probe assembly, a pushing piston is arranged at the bottom of the probe assembly, and mutually independent recovery mechanisms are respectively arranged at two sides of the probe assembly;

wherein the probe assembly is connected with the suction component, and the pushing piston is connected with the power component.

The power assembly comprises a servo motor, the power input end of the servo motor is connected with the pushing drive circuit, and the output end of the servo motor is connected with a lead screw; the screw rod is connected with a power piston, and the power piston is driven to stretch by the rotation of the screw rod; wherein the power piston is connected to the thrust piston through a mud channel.

The invention is further improved in that the suction component and the pollution rate evaluation assembly are assembled into a whole, the suction component and the pollution rate evaluation assembly are connected with a suction pump through pipelines, and the suction pump is communicated with the probe assembly through a flow channel; the rear end of the suction component is connected with a suction driving circuit.

The invention has the further improvement that the side wall of the body is also provided with a side wall hole for communicating the pollution rate evaluation assembly with the external annulus;

wherein the drawdown pump pumps the formation sample drawn by the probe assembly to the contamination rate evaluation assembly; and the pollution rate evaluation assembly discharges unqualified stratum samples through the side wall hole and conveys the qualified stratum samples into the storage tank assembly.

The invention is further improved in that the tank assembly comprises a plurality of sample tanks, and the sample tanks are connected with the pollution rate evaluation assembly through a multi-way electromagnetic valve and a switch valve and receive qualified samples.

The invention is further improved in that the storage tank assembly and the fluid parameter measuring assembly are placed inside the sample measuring drill collar, and the fluid parameter measuring assembly measures the parameters of the formation sample and uploads the parameters to the ground control system.

The invention is further improved in that the fluid parameter measuring assembly is connected with a conversion joint through a pipeline, and the conversion joint is connected with the switch valve; when the on-off valve is in an open position, formation fluid enters the fluid parameter measurement assembly through the pipeline.

Compared with the prior art, the invention has the advantages that:

according to the formation fluid sampling while drilling and fluid online surveying and mapping tool, formation fluid sampling while drilling can be performed through a sampling instruction sent by the ground, the pollution rate of the formation fluid is measured on line, and the formation fluid meeting the requirements is stored in a sample tank. Meanwhile, the tool provided by the invention also realizes the on-line mapping of the properties of the formation fluid and transmits the formation fluid to the ground.

By the formation fluid sampling while drilling and the online fluid mapping tool, formation fluid sampling while drilling and online measurement of key properties of the formation fluid can be realized. Compared with a cable type sampling tool, because the invention has short stratum opening time when sampling, the near-well wall accessory of the well bore is slightly polluted by mud invasion filtrate, and the original stratum fluid is more easily obtained. In addition, in the conventional cable sampling limited environments such as a highly deviated well, a horizontal well, an extended reach well and the like, the tool provided by the invention can be applied to realize sampling of the formation fluid.

Drawings

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of a formation fluid sampling while drilling and on-line fluid mapping tool according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a downhole portion of one embodiment of the present invention showing the structure in section;

FIG. 3 is a schematic structural view of an outer housing of an embodiment of the present invention;

FIG. 4 is a schematic structural view of a power assembly according to an embodiment of the present invention;

FIG. 5 is a schematic view of a sampling assembly according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a body according to an embodiment of the present invention;

FIG. 7 isbase:Sub>A cross-sectional view A-A of FIG. 6;

fig. 8 is a schematic diagram of a power assembly according to an embodiment of the present invention.

In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.

The meaning of the reference symbols in the drawings is as follows: 1. a surface control system, 2, an external shell, 3, a power supply component, 4, a sampling component, 5, a power system, 6, a pollution rate evaluation assembly, 7, a storage tank component, 8, a fluid parameter measurement component, 9, a downhole control component, 10, a stratum, 11, a surface pulse transmitter, 12, a mud tank, 13, a mud pump, 21, a body, 22, an instrument chamber shell, 23, an upper shell, 24, a sampling drill collar, 25, a sample measuring drill collar, 26, a double male connector, 211, a first gland, 212, a first open slot, 213, a second open slot, 251, a spiral wing, 252, a through hole slot, 31, a slip ring, 32, a seal ring set, 33, a pushing drive circuit, 34, a pumping drive circuit, 331, a pushing drive circuit cable, 332, a pushing drive circuit connector, 333, a first hard alloy punching ring, 334, a pushing drive circuit connecting block, 335, multiconnector, 341, instrument chamber tubing, 342, suction drive circuit connector, 343, suction drive circuit cable, 344, second cemented carbide impact ring, 345, suction drive circuit cable, 41, probe assembly, 42, filter, 43, thrust piston, 44, restoring mechanism, 45, differential pressure sensor, 47, hydraulic bore, 51, power component, 52, suction component, 511, servo motor, 512, coupling, 513, reducer, 514, bearing set, 515, lead screw, 516, power piston, 517, piston cavity, 518, first pressure sensor, 519, slurry channel, 521, suction pump, 522, line, 523, side wall bore, 524, on-off valve, 525, flow channel, 526, second pressure sensor, 527, upper end line, 71, sample tank, 72, flow channel, 73, first line, 74, sample tank, A second pipeline 75, a crossover joint 76, a storage tank pipeline 81, a multi-way solenoid valve 82, a fluid parameter measuring assembly pipeline 110, formation fluid 111 and a drilling tool.

Detailed Description

In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.

FIG. 1 schematically shows a formation fluid sampling while drilling and online fluid mapping tool according to an embodiment of the invention, comprising: a surface control system 1 and a downhole section. The surface control system 1 is arranged on the ground to control the operation of the downhole part, the downhole part enters the well along with the drilling tool 111, and the sampling and online mapping are completed downhole.

Wherein, the ground control system 1 sends a control instruction underground on the ground; the downhole portion (as shown in fig. 2) comprises:

and an outer casing 2 connected to the drill 111 for protecting other components. Inside the outer casing 2 the following components are arranged: the underground control assembly 9 receives a control command of the ground control system 1 and controls sampling and online surveying and mapping;

a sampling assembly 4 configured to take a formation 10 sample;

the power system 5 is used for providing power for the extension and retraction and suction sampling of the sampling assembly 4;

a tank assembly 7 for storing qualified formation 10 samples;

the pollution rate evaluation assembly 6 is used for judging whether the pollution rate of the stratum 10 sample is qualified or not, discharging the unqualified stratum 10 sample, and conveying the qualified stratum 10 sample into the storage tank assembly 7; and

and the fluid parameter measuring assembly 8 is used for measuring the parameters of the stratum 10 sample in the storage tank assembly 7 and feeding the measured data back to the surface control system 1.

When the formation fluid sampling while drilling and fluid online mapping tool is used, a downhole part enters the downhole along with a drilling tool 111, a worker sends a control instruction to the downhole part through a ground control system 1, a downhole control component 9 controls a power system 5 to provide power for a sampling component 4, the sampling component 4 can extend out and be attached to a stratum 10 and absorb a stratum 10 sample, the absorbed stratum 10 sample is detected through a pollution rate evaluation assembly 6, if the sample is qualified, the sample is transmitted into a storage tank component 7, and a fluid parameter component conducts online mapping on the stratum 10 sample; if the contamination rate evaluation assembly 6 fails to detect the formation 10 sample, it is discharged into the annulus.

The tool of the embodiment can sample formation fluid while drilling through a sampling command sent by the surface, and can measure the pollution rate of the formation fluid 110 on line, and store the formation fluid 110 meeting the requirement into the sample tank 7. Meanwhile, the tool provided by the invention also realizes the on-line measurement and drawing of the properties of the formation fluid and transmits the formation fluid to the ground.

Sampling while drilling of formation fluid 110 and online measurement of key properties of the formation fluid may be accomplished with the tool of this embodiment. Compared with a cable type sampling tool, because the invention has short stratum opening time when sampling, the near-well wall accessory of the well bore is slightly polluted by mud invasion filtrate, and the original stratum fluid is more easily obtained. In addition, in conventional cable sampling limited environments such as highly deviated wells, horizontal wells, extended reach wells and the like, the tool of the embodiment can be applied to realize sampling of formation fluid.

In the embodiment, the low-pollution or pollution-free formation fluid 110 is rapidly collected by using the while-drilling fluid sampling technology when the hydrocarbon reservoir is just opened, the operation time is shorter and the obtained formation 10 data is more real compared with cable type fluid sampling.

In one embodiment, as shown in fig. 3, the outer housing 2 comprises a body 21 for mounting the power system 5; the upper end of the body 21 is provided with an instrument chamber shell 22 and an upper shell 23 which are used for installing the underground control component 9 and the power system 5; the lower end of the body 21 is provided with a sampling drill collar 24 for mounting the sampling component 4; and a sample measuring drill collar 25 is arranged at the lower end of the sampling drill collar 24 and used for mounting the fluid parameter measuring component 8. The bottom end of the sample measuring drill collar 25 is provided with a double male joint 26. Wherein, the upper shell 23, the instrument chamber shell 22, the body 21, the sampling drill collar 24, the sample measuring drill collar 25 and the double male joint 26 are connected through screw threads.

The external shell 2 is divided into multiple sections, and the connection is stable and the sealing performance is good through the mode of thread connection, so that the assembly and disassembly are convenient, and other components are convenient to install in each part. When the components are assembled, the components are respectively arranged on the corresponding parts of the outer shell 2, the control component 9 and the power system 5 are arranged on the instrument chamber shell 22 and the upper shell 23, the sampling component 4 is arranged on a sampling drill collar, and the storage tank component 7 and the fluid parameter measuring component 8 are arranged in a sample measuring drill collar 25. And then the upper shell 23, the instrument chamber shell 22, the body 21, the sample measuring drill collar 25 and the double male connector 26 are connected through threads to complete assembly.

In one embodiment, as shown in fig. 2, the power supply assembly 3 is disposed in the upper housing 23 and the instrument chamber housing 22, and the power supply assembly 3 may be a mud generator or a large-capacity battery pack. The power supply assembly 3 is connected to other units requiring power supply through wires. In the present embodiment, the power supply assembly 3 includes a rectifying and voltage-stabilizing circuit, a main control circuit, a pushing drive circuit 33, a suction drive circuit 34, and a solenoid valve control circuit. The push drive circuit 33 provides power and control to the power assembly 51 and the suction drive circuit 34 provides power and control to the suction assembly 52 and the pollution rate evaluation assembly 6. The solenoid valve control circuit provides power and system control for the tank assembly 7 and the fluid parameter measurement assembly 8.

The pod carrier is placed inside the pod housing 22 and secured, sealed by a set of sealing rings 32. The upper part of the nacelle carrier is connected to the power supply module 3 via a slip ring 31, which slip ring 31 ensures that the electrical connection is maintained during rotation or sliding.

The power supply assembly 3 ensures the power supply of each power utilization assembly of the underground part, and ensures the smooth operation of sampling and online measuring and drawing.

In one embodiment, as shown in fig. 4, the power system 5 includes a power assembly 51 and a suction assembly 52, and the body 21 is provided with a first opening groove 212 and a second opening groove 213 for mounting the power assembly 51 and the suction assembly 52, respectively, and is sealed by a first gland 211 (shown in fig. 6) and a second gland (opposite to the first gland 211, not shown in fig. 6). The power assembly 51 is integrally placed in the first opening groove 212 of the body 21 and is bolt-tightened by the first pressing cover 211. Power assembly 51 provides power for sampling assembly 4 to extend and retract against formation 10, and pumping assembly 52 provides power for sampling assembly 4 to pump a sample of formation 10.

During the process of taking a sample, the sampling assembly 4 needs to extend into the formation 10 and then suck the formation fluid 110 in the formation 10 into a sample by suction. During the aspiration operation, the power assembly provides power for the retraction of the sampling assembly 4, and the suction assembly 52 provides power for the aspiration of the sampling assembly 4.

Preferably, the power assembly 51 in the power system 5 adopts hydraulic pressure to provide power for the extension and retraction of the sampling assembly 4, so that the sampling assembly 4 can extend out of the stratum 10, and the sampling assembly 4 is controlled by the suction assembly 52 to suck the sample plate of the stratum 10 to finish the collection; and then the power assembly 51 controls the retraction of the sampling assembly 4.

In one embodiment, as shown in FIG. 3, the sampling drill collar 24 is provided with a spiral wing 251 having an outer diameter slightly smaller than the diameter of the borehole, and the spiral wing 251 is provided with a through-hole slot 252 for installing the sampling assembly 4.

In a preferred embodiment, as shown in fig. 5, the sampling assembly 4 comprises a probe assembly 41 for sampling, a filter 42 is disposed on the probe assembly 41, a pushing piston 43 is disposed at the bottom of the probe assembly 41, and two independent restoring mechanisms 44 are disposed at two sides of the probe assembly. The pushing piston 43 is connected with the power assembly 51, and is driven by the power assembly 51 to extend and retract so as to drive the probe assembly 41 to extend or retract. The probe assembly 41 is driven by the pumping assembly 52 to draw a sample of the formation 10, and the filter 42 is capable of filtering large particles or other impurities. The probe assembly 41 is connected with the suction component 52, and the pushing piston 43 is connected with the power component 51. The restoring mechanism 44 may be a spring mechanism, other elastic device or a hydraulic mechanism, as long as it is sufficient to restore the probe assembly 41 to the original position.

When fluid sampling is carried out, the sampling component 4 is driven by the hydraulic pressure of the power component 51, the pushing piston 43 extends outwards, the sealing gasket on the probe assembly 41 is contacted with the inner wall of the stratum 10, and the other surface of the sampling drill collar 24 is contacted with the inner wall of the stratum 10 under the action of thrust. After the probe assembly 41 is extended into position, the pumping assembly 52 is activated to cause the probe of the probe assembly 41 to begin pumping formation fluid 110 to complete the sampling. After sampling, the probe assembly 41 is recovered to the initial state by the recovery force reaction of the recovery mechanism 44.

A pressure difference sensor 45 is arranged on a pipeline of the probe assembly 41 connected with the suction component, the pressure difference sensor 45 is connected with the pushing driving circuit 33, and whether the probe of the probe assembly 41 extends to the position or not is judged by detecting the pressure difference.

The push drive circuit 33 is connected to a push drive circuit cable 331 through a push drive circuit connector 332, and the push drive circuit cable 331 is connected to a servo motor through a multi-core connector 335.

The power piston 516 extends or retracts, hydraulic oil in the piston cavity 517 is output to the pushing piston 43, the pushing piston 43 is controlled to stretch and retract, the extension and the recovery of the probe assembly are controlled, and the output pressure is accurately acquired by adopting the differential pressure sensor 45.

In the process, the underground control component 9 feeds back and records the number of turns of the motor through the encoder, calculates the actuation distance of the piston and the final extension height of the probe, and provides a judgment basis for judging whether the probe assembly extends in place or not by combining the output pressure of the system.

In one embodiment, as shown in fig. 4 and 8, the power assembly 51 includes a servo motor 511, a coupling 512, a reducer 513, a bearing set 514, a lead screw 515 and a power piston 516, which are connected in sequence. The power assembly 51 comprises a multi-core connector 335, which is connected with the pushing drive circuit 33 of the power supply assembly 3 through a pushing drive cable and the multi-core connector 335, and executes the action command sent by the pushing drive circuit 33. The power piston 516 powers the extension and retraction of the sampling assembly 4.

The piston cavity 517 of the power piston 516 is connected with the pushing piston 43 through a mud channel 519, a first pressure sensor 518 and a first cemented carbide impact-resistant ring 333 are arranged in the mud channel 519, and the first cemented carbide impact-resistant ring 333 is connected with a pushing drive circuit connecting block pipeline 522334. The first pressure sensor 518 is connected with the pushing drive circuit 33 through a first hard alloy impact-resistant ring 333 and a pushing drive circuit connecting block pipeline 522334, the pressure of the power piston 516 is fed back, and the pushing drive circuit 33 judges the state of the power piston 516 according to the pressure value.

The servo motor 511 is indirectly connected with the lead screw 515 through the connecting shaft, the reducer 513 and the bearing set 514, and drives the lead screw 515 to rotate forwards or reversely, the lead screw 515 pushes the power piston 516 to extend or retract, so that the hydraulic pressure in the piston cavity 517 of the power piston 516 is transmitted to the bottom of the suction probe in the sampling assembly 4 or is withdrawn from the bottom of the suction probe, and the suction probe is driven to extend or retract, and the sampling assembly 4 is controlled to extend and contract and contact or separate with the stratum 10.

In one embodiment, as shown in FIG. 2, the suction assembly 52 and the contamination rate evaluation assembly 6 are integrally assembled and placed in the second opening groove 213 of the body 21 and compressed by the second gland. The suction unit 52 and the contamination rate evaluation assembly 6 are connected to a suction pump 521 through a line 522, the suction pump 521 is connected to the sampling unit 4 through a flow path 525, and the formation fluid 110 is sucked into the contamination rate evaluation assembly 6 by the suction action of the suction pump 521.

Preferably, the suction drive circuit 34 is connected to the suction drive circuit connector 342 via the pod conduit 341 and to the suction assembly 52 via a suction drive circuit cable 343. The side wall of the body 21 is also provided with a side wall hole 523 for communicating the pollution rate evaluation assembly 6 with the external annulus, and the side wall hole 523 is provided with a switch valve 524 for discharging unqualified samples.

The suction pump 521 causes the sampling assembly 4 to draw formation fluid 110 from the formation 10 via flow line 525 and deliver it via line 522 to the contamination rate evaluation assembly 6, and samples with unacceptable contamination rates are discharged via the on/off valve 524 to the borehole annulus via the sidewall hole 523. The samples qualified in the pollution rate are reversely discharged into the tank assembly 7 through the suction pump 521 to be stored. A pressure transducer is provided in the suction assembly 52 to record the fluid pressure in the line 522 at the front end of the suction pump 521.

The pressure sensor is connected to the suction drive circuit 34 via a suction drive circuit cable 343 and a second cemented carbide impact ring. The pressure sensor feeds back the detected pressure information to the suction driving circuit, and a basis is provided for the suction driving circuit to control suction.

3 or 4 open grooves (as shown in fig. 7) are symmetrically arranged on the circumference of the body 21, wherein the first open groove 212 and the second open groove 213 are respectively used for placing the power module 51 and the suction module 52, and the rest of the first open groove and the second open groove are respectively used for placing the third open groove and the selectively arranged fourth open groove, so as to place an oil compensation system, and provide pressure compensation under the downhole high-pressure condition for the power module 51 and the suction module 52.

In one embodiment, as shown in FIG. 2, the reservoir assembly 7 and the fluid parameter measurement assembly 8 are placed inside a sample measuring drill collar 25, with the upper and lower ends compressed by the connector block and the dual male connector 26. The tank assembly 7 comprises a number of individual sample tanks 71, preferably 3 or 4 sample tanks 71 assembled. The tank assembly 7 is provided with a flow passage 72 for drilling fluid in the middle and an on-off valve 524 and a multi-way solenoid valve at the upper end.

A multi-way solenoid valve 81 is connected to each individual sample tank 71 to control the flow of formation fluid 110 samples into the different sample tanks 71 for storage. The fluid parameter measurement assembly 8 is connected to the crossover joint 75 by line 522. When the on-off valve 524 is in the open position, the formation fluid 110 enters the fluid parameter measurement assembly 8 through the pipeline 522, and the on-line measurement, data storage and uploading of the viscosity, density and composition of the formation fluid 110 are realized.

In one embodiment, the formation fluid sampling while drilling and fluid on-line mapping tool is provided with a circulation pipe for circulating drilling fluid, which comprises an instrument bin carrier pipe, a side wall hole 523, an upper end pipeline 527, a pipeline 522, a right mud channel 519, a flow passage 525, a suction driving circuit 34 hard alloy impact-resistant ring, a mud channel 519, a pushing driving circuit 33 hard alloy impact-resistant ring, a suction driving circuit 34 connecting block pipeline 522, a hydraulic hole 47, a first pipeline 73, a second pipeline 74, a fluid parameter measuring component pipeline 82, a suction driving circuit 34 connecting block pipeline 522 and a hydraulic pipeline 522.

In a preferred embodiment, a surface pulse transmitter 11, a mud pit 12 and a mud pump 13 are connected to the surface control system 1, and the surface pulse transmitter 11 transmits mud through a surface pulse generator to send out a pressure pulse signal.

The process of sampling and mapping using the formation fluid sampling while drilling and on-line fluid mapping tool according to the embodiment is as follows:

the tool of the present embodiment is first connected to a drill bit 111 and lowered into the wellbore with the drill bit 111 during normal drilling operations. When it is determined to sample the formation fluid 110, a sampling command is issued by the surface control system 1 and the surface pulse generator is controlled to issue a pressure pulse signal.

And after receiving a sampling command sent by the ground, the downhole control assembly 9 controls the power system 5 to work. At this time, the power assembly 51 controls the servo motor 511 to rotate forward, the forward rotation of the servo motor 511 is transmitted to the lead screw 515 through the coupling 512, the reducer 513, the bearing set 514 and other components, the lead screw 515 is driven to rotate forward, the power piston 516 can extend due to the action of the screw threads in the forward rotation of the lead screw 515, the power piston 516 transmits power to the pushing piston 43, the pushing piston 43 pushes the probe assembly 41 to extend out and extend into the formation 10, and the other side of the probe assembly is attached to the well wall.

After completion of the extraction, the suction pump 521 in the suction assembly 52 is activated to draw formation fluid 110 from the formation 10, and after filtration through the probe filter 42, the formation fluid 110 enters the contamination rate evaluation assembly 6.

The pollution rate evaluation assembly 6 detects whether the sample is qualified or not, the unqualified sample is discharged through the side wall hole 523, the qualified sample enters the sample tank 71 through the pipeline 522 for storage, and part of the sample enters the fluid parameter measurement component 8, so that the formation fluid 110 sample is measured on line. After sampling, the servo motor 511 in the power unit 51 is reversed and the probe unit 41 is recovered by the recovery mechanism 44 in the probe unit to recover the initial state.

The sample entering the sample tank 71 is measured by the fluid parameter measuring assembly 8, and the viscosity, density, composition and other data of the formation fluid 110 are measured, stored and uploaded to the surface.

In the invention, the upper part is the direction close to the well mouth, and the lower part is the direction far away from the well mouth.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the features mentioned in the embodiments can be combined in any manner, as long as no structural conflict exists. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (13)

1. A formation fluid sampling while drilling and online fluid mapping tool, comprising:

the ground control system (1) sends a control command to the underground from the ground; and

a downhole portion comprising:

an outer casing (2) for the housing,

the underground control assembly (9) receives a control instruction of the ground control system (1) and controls sampling and online surveying and mapping;

a sampling assembly (4) configured to take a formation (10) sample;

the power system (5) is used for providing power for the extension and retraction and suction sampling of the sampling assembly (4);

a tank assembly (7) storing qualified formation (10) samples;

the pollution rate evaluation assembly (6) is used for judging whether the pollution rate of the stratum (10) sample is qualified or not, discharging the unqualified stratum (10) sample, and conveying the qualified stratum (10) sample into the storage tank assembly (7); and

a fluid parameter measurement assembly (8) for measuring a parameter of a formation (10) sample within the tank assembly (7) and feeding back the measured data to the surface control system (1).

2. The while drilling formation fluid sampling and online fluid mapping tool of claim 1, wherein the outer housing (2) comprises a body (21) for mounting a power system (5); the upper end of the body (21) is provided with an instrument cabin shell (22) and an upper shell (23) which are used for installing the underground control assembly (9); the lower end of the body (21) is provided with a sampling drill collar (24) for mounting a sampling assembly (4); and a sample measuring drill collar (25) is arranged at the lower end of the sampling drill collar (24) and used for installing a fluid parameter measuring component (8).

3. The tool for formation fluid sampling while drilling and online fluid mapping according to claim 2, wherein a power supply assembly (3) is installed in the instrument chamber shell (22), and the power supply assembly (3) comprises a rectifying and voltage-stabilizing circuit, a master control circuit, a pushing driving circuit (33), a sucking driving circuit (34) and a solenoid valve control circuit.

4. The formation fluid sampling while drilling and online fluid mapping tool as recited in claim 3, wherein the power system (5) comprises a power assembly (51) for powering the sampling assembly (4) to telescope and a pumping assembly (52) for powering the sampling assembly (4) to pump a formation (10) sample.

5. The tool for formation fluid sampling while drilling and online mapping of fluids as claimed in claim 3 or 4, wherein the sampling drill collar (24) is provided with a spiral wing (251) having an outer diameter slightly smaller than the diameter of the borehole, and the spiral wing (251) is provided with a through hole groove (252) for installing the sampling assembly (4).

6. The formation fluid sampling while drilling and online fluid mapping tool as claimed in claim 5, wherein the sampling component (4) comprises a probe assembly (41), a filter (42) is arranged on the probe assembly (41), a pushing piston (43) is arranged at the bottom of the probe assembly (41), and mutually independent recovery mechanisms (44) are respectively arranged at two sides of the probe assembly;

wherein the probe assembly (41) is connected with the suction component (52), and the pushing piston (43) is connected with the power component (51).

7. The while drilling formation fluid sampling and online fluid mapping tool as recited in claim 6, characterized in that the end of the probe assembly (41) is provided with a differential pressure sensor (45) connected to the push driving circuit (33).

8. The while-drilling formation fluid sampling and online fluid mapping tool as recited in claim 7, wherein the power assembly (51) comprises a servo motor (511), the power input end of the servo motor (511) is connected with the pushing driving circuit (33), and the output end of the servo motor (511) is connected with a lead screw (515); the lead screw (515) is connected with a power piston (516), and the lead screw (515) rotates to drive the power piston (516) to extend and retract; wherein the power piston (516) is connected to the thrust piston (43) by a mud channel (519).

9. The formation-while-drilling fluid sampling and online fluid mapping tool as recited in claim 8, wherein the pumping assembly (52) and the contamination rate evaluation assembly (6) are integrally assembled, the pumping assembly (52) and the contamination rate evaluation assembly (6) are connected with a suction pump (521) through a pipeline (522), and the suction pump (521) is communicated with the probe assembly (41) through a flow passage (525); the rear end of the suction component (52) is connected with a suction driving circuit (34).

10. The tool for formation fluid sampling while drilling and online mapping of fluids as claimed in claim 8 or 9, wherein the body (21) is further provided with a sidewall hole (523) on the sidewall for communicating the contamination rate evaluation assembly (6) and the external annulus;

wherein the suction pump (521) pumps the formation (10) sample drawn by the probe assembly (41) to the contamination rate evaluation assembly (6); and the pollution rate evaluation assembly (6) discharges unqualified stratum (10) samples through the side wall hole (523), and transfers qualified stratum (10) samples into the storage tank assembly (7).

11. The formation fluid sampling while drilling and online fluid mapping tool according to claim 10, wherein the tank assembly (7) comprises a plurality of sample tanks (71), and the sample tanks (71) are connected with the contamination rate evaluation assembly (6) through a multi-way solenoid valve (81) and an on-off valve (524) to receive qualified samples.

12. The while drilling formation fluid sampling and online fluid mapping tool as recited in claim 11, wherein the tank assembly (7) and the fluid parameter measurement assembly (8) are placed inside a sample measuring drill collar (25), and the fluid parameter measurement assembly (8) measures a parameter of the formation (10) sample and uploads it to the surface control system (1).

13. The while drilling formation fluid sampling and online fluid mapping tool as recited in claim 12, wherein the fluid parameter measurement assembly (8) is connected to a crossover joint (75) through a tubing line (522), the crossover joint (75) being connected to the on-off valve (524); when the on-off valve (524) is in an open position, formation fluid (110) enters the fluid parameter measurement assembly (8) through the flowline (522).

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