A tool for sampling and mapping formation fluids while drilling

Abstract

The present application provides a tool for formation fluid sampling and fluid online mapping while drilling, comprising a surface control system for sending control instructions to the downhole; and a downhole part, comprising: an outer shell, a downhole control assembly for receiving the control instructions from the surface control system and controlling the sampling and online mapping; a sampling assembly configured to be able to suck formation samples; a power system for providing power for the sampling assembly to stretch and suck the samples; a storage tank assembly for storing qualified formation samples; a contamination rate evaluation assembly for judging whether the contamination rate of the formation samples is qualified, discharging unqualified formation samples, and transmitting qualified formation samples into the storage tank assembly; and a fluid parameter measurement assembly for measuring parameters of the formation samples in the storage tank assembly and feeding back the measured data to the surface control system.

Description

TECHNICAL FIELD

[0001] The present application relates to a tool for formation fluid sampling and fluid online mapping while drilling, belonging to the field of formation fluid sampling in oil and gas drilling. BACKGROUND

[0002] By collecting representative formation fluid samples, geological parameters such as fluid type and properties are obtained, which is of great significance for accurately determining the oil and gas content of the reservoir and reasonably formulating the medium and long-term development plan of the oil and gas field.

[0003] At present, the main method for obtaining formation fluid is through the use of cable sampling tools. The working principle of cable formation sampling tools is to press a small pad probe against the well wall, then reduce the pressure in the probe to a sufficient level to break the mud cake seal and draw the fluid from the formation into a sealable sampling chamber. Subsequently, the composition of the sample chamber is analyzed on the ground to determine the content of hydrocarbons.

[0004] The cable fluid sampling technology has a long development time and is mature, but it occupies the drilling rig for a long time during operation, and the instrument is prone to sticking during sampling due to the lack of mud circulation. Moreover, there are problems such as difficulty in lowering the instrument into the well for high-deviation wells, horizontal wells, and large-displacement wells. In addition, cable fluid sampling is a post-drilling sampling method, which results in a long opening time of the formation and easy contamination of the formation near the well wall. Using formation testing technology to take formation fluid to the laboratory for analysis often produces errors and is difficult to obtain real component data of the formation fluid, and it also requires high cost and time.

[0005] The cable-type downhole formation fluid sampling device in the prior art stores formation fluid samples in a sampling cylinder and opens or closes the fluid pipeline between the sampling cylinder and the sampling unit through a one-way valve to realize the sampling function. The entire system is controlled by the control part. The patent provides a cable sampling tool that does not have the function of sampling while drilling and cannot measure fluid performance parameters online. SUMMARY

[0006] In view of the above technical problems existing in the prior art, the present application provides a tool for formation fluid sampling and fluid online mapping while drilling, which can perform formation fluid sampling while drilling through sampling instructions sent from the ground, and measure the contamination rate of formation fluid online. The formation fluid that meets the requirements is stored in a sample tank. At the same time, the tool provided by the present application also realizes online mapping of the properties of formation fluid and transmits the data to the ground.

[0007] The present application provides a tool for formation fluid sampling and fluid online mapping while drilling, comprising:

[0008] a ground control system that sends control instructions to the downhole; and

[0009] a downhole part, comprising:

[0010] an outer casing,

[0011] a downhole control assembly receiving control instructions from a surface control system and controlling sampling and on-line mapping;

[0012] a sampling assembly configured to draw a formation sample;

[0013] a power system providing power for the extension and suction of the sampling assembly;

[0014] a storage assembly storing a qualified formation sample;

[0015] a contamination rate evaluation assembly determining whether the contamination rate of the formation sample is qualified, and discharging the unqualified formation sample and transmitting the qualified formation sample to the storage assembly; and

[0016] a fluid parameter measurement assembly measuring parameters of the formation sample in the storage assembly and feeding back the measured data to the surface control system.

[0017] Further improvement of the present application is that the outer casing comprises a body for mounting the power system; an upper end of the body is provided with an instrument cabin casing and an upper casing for mounting the downhole control assembly; a lower end of the body is provided with a sampling drill collar for mounting the sampling assembly; a lower end of the sampling drill collar is provided with a measurement drill collar for mounting the fluid parameter measurement assembly.

[0018] Further improvement of the present application is that a power supply assembly is mounted in the instrument cabin casing, and the power supply assembly comprises a rectifier and voltage stabilizing circuit, a main control circuit, a push driving circuit, a suction driving circuit and an electromagnetic valve control circuit.

[0019] Further improvement of the present application is that the power system comprises a power assembly providing power for the extension of the sampling assembly, and a suction assembly providing power for the suction of the formation sample by the sampling assembly.

[0020] Further improvement of the present application is that the sampling drill collar is provided with a spiral wing with an outer diameter slightly smaller than the diameter of a borehole, and the spiral wing is provided with a through-hole slot for mounting the sampling assembly.

[0021] Further improvement of the present application is that the sampling assembly comprises a probe assembly, the probe assembly is provided with a filter, a push piston is arranged at the bottom of the probe assembly, and a recovery mechanism is arranged at each side of the push piston respectively.

[0022] The probe assembly is connected to the suction assembly, and the push piston is connected to the power assembly.

[0023] The further improvement of the present application is that the power assembly comprises a servo motor, the power input end of the servo motor is connected with the push driving circuit, and the output end is connected with a lead screw; the lead screw is connected with a power piston, and the lead screw drives the power piston to stretch and retract; wherein the power piston is connected with the push piston through a mud channel.

[0024] The further improvement of the present application is that the suction assembly and the pollution rate evaluation assembly are assembled integrally, the suction assembly and the pollution rate evaluation assembly are connected with a suction pump through a pipeline, the suction pump is communicated with the probe assembly through a flow channel; the rear end of the suction assembly is connected with a suction driving circuit.

[0025] The further improvement of the present application is that the side wall of the body is further provided with a side wall hole communicated with the pollution rate evaluation assembly and an external annulus;

[0026] The further improvement of the present application is that the suction pump pumps the formation sample extracted by the probe assembly to the pollution rate evaluation assembly; the pollution rate evaluation assembly discharges unqualified formation sample through the side wall hole, and delivers qualified formation sample into the storage tank assembly.

[0027] The further improvement of the present application is that the storage tank assembly comprises a plurality of sample tanks, 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.

[0028] The further improvement of the present application is that the storage tank assembly and the fluid parameter measurement assembly are placed in a sampling drill collar, the fluid parameter measurement assembly measures the parameters of the formation sample and uploads to the ground control system.

[0029] The further improvement of the present application is that the fluid parameter measurement assembly is connected with a conversion joint through a pipeline, the conversion joint is connected with the switch valve; when the switch valve is in an open state, the formation fluid enters the fluid parameter measurement assembly through the pipeline.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] The tool for taking formation fluid sample while drilling and measuring and mapping fluid on line provided by the present application can take formation fluid sample while drilling, measure the pollution rate of the formation fluid on line, and store qualified formation fluid into a sample tank. Meanwhile, the tool provided by the present application can also measure and map the properties of the formation fluid on line and transmit to the ground.

[0032] The tool for formation fluid sampling and fluid online mapping while drilling can realize the sampling of formation fluid while drilling and the measurement of key properties of formation fluid online. Compared with the cable sampling tool, the tool can obtain the original formation fluid because the formation is opened for a short time when the tool samples and the near wellbore of the wellbore is less polluted by mud invasion filtrate. In addition, the tool can be applied to sample the formation fluid in the environment where the conventional cable sampling is limited, such as the high-deviation well, the horizontal well and the extended reach well. BRIEF DESCRIPTION OF DRAWINGS

[0033] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, in which:

[0034] Figure 1 Fig. 1 shows a structural schematic diagram of a tool for formation fluid sampling and fluid online mapping while drilling according to an embodiment of the present application;

[0035] Figure 2 Fig. 2 shows a structural schematic diagram of a downhole part according to an embodiment of the present application, showing a sectional structure;

[0036] Figure 3 Fig. 3 shows a structural schematic diagram of an external shell according to an embodiment of the present application;

[0037] Figure 4 Fig. 4 shows a structural schematic diagram of a power assembly according to an embodiment of the present application;

[0038] Figure 5 Fig. 5 shows a structural schematic diagram of a sampling assembly according to an embodiment of the present application;

[0039] Figure 6 Fig. 6 shows a structural schematic diagram of a body according to an embodiment of the present application;

[0040] Figure 7 Fig. 7 shows an A-A sectional view of the tool for formation fluid sampling and fluid online mapping while drilling according to an embodiment of the present application; Figure 6

[0041] Figure 8 Fig. 8 shows a principle schematic diagram of the power assembly according to an embodiment of the present application.

[0042] In the drawings, the same parts are designated by the same reference numerals. The drawings are not drawn according to the actual scale.

[0043] ​The meanings of the reference numerals in the drawings are as follows: 1, surface control system, 2, outer shell, 3, power supply assembly, 4, sampling assembly, 5, power system, 6, contamination rate evaluation assembly, 7, storage tank assembly, 8, fluid parameter measurement assembly, 9, downhole control assembly, 10, formation, 11, surface pulse transmitter, 12, mud pit, 13, mud pump, 21, body, 22, instrument capsule shell, 23, upper shell, 24, sampling drill collar, 25, sampling drill collar, 26, double male joint, 211, first gland, 212, first open slot, 213, second open slot, 251, helical wing, 252, through-hole slot, 31, slip ring, 32, sealing ring group, 33, push drive circuit, 34, suction drive circuit, 331, push drive circuit cable, 332, push drive circuit connector, 333, first hard alloy impact ring, 334, push drive circuit connection block pipeline, 335, multi-core connector, 341, instrument capsule pipeline, 342, suction drive circuit connector, 343, suction drive circuit cable, 344, second hard alloy impact ring, 345, suction drive circuit cable, 41, probe assembly, 42, filter, 43, push piston, 44, recovery mechanism, 45, differential pressure sensor, 47, hydraulic hole, 51, power assembly, 52, suction assembly, 511, servo motor, 512, coupling, 513, speed reducer, 514, bearing group, 515, lead screw, 516, power piston, 517, piston cavity, 518, first pressure sensor, 519, mud passage, 521, suction pump, 522, pipeline, 523, side wall hole, 524, on-off valve, 525, flow channel, 526, second pressure sensor, 527, upper end pipeline, 71, sample tank, 72, flow channel, 73, first pipeline, 74, second pipeline, 75, conversion joint, 76, storage tank pipeline, 81, multi-way electromagnetic valve, 82, fluid parameter measurement assembly pipeline, 110, formation fluid, 111, drilling tool. DETAILED DESCRIPTION

[0044] In order to make the technical solutions and advantages of the present application clearer, the exemplary embodiments of the present application are further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not an exhaustive enumeration of all embodiments. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0045] Figure 1 A tool for formation fluid sampling and fluid online mapping while drilling according to an embodiment of the present application is schematically shown, which comprises a surface control system 1 and a downhole part. The surface control system 1 is arranged to control the downhole part to work on the ground, and the downhole part enters into the downhole with the drilling tool 111, and completes sampling and online mapping in the downhole.

[0046] Wherein, the ground control system 1 sends control instructions to the downhole; the downhole part (as shown in the figure) includes: Figure 2

[0047] The external shell 2 is connected to the drilling tool 111 and protects other components. The following components are arranged inside the external shell 2: the downhole control assembly 9 receives the control instructions of the ground control system 1 and controls sampling and online mapping of the formation 10;

[0048] The sampling assembly 4 is configured to be able to suck the formation 10 sample;

[0049] The power system 5 provides power for the sampling assembly 4 to stretch and suck the sample;

[0050] The storage tank assembly 7 stores qualified formation 10 samples;

[0051] The contamination rate evaluation assembly 6 judges whether the contamination rate of the formation 10 sample is qualified, and discharges the unqualified formation 10 sample and transmits the qualified formation 10 sample to the storage tank assembly 7; and

[0052] The fluid parameter measurement assembly 8 measures the parameters of the formation 10 sample in the storage tank assembly 7 and feeds back the measured data to the ground control system 1.

[0053] When the tool for sampling and online mapping of formation fluid while drilling according to the embodiment is used, the downhole part enters the downhole with the drilling tool 111, the control instructions are sent to the downhole part by the ground control system 1, the downhole control assembly 9 controls the power system 5 to provide power for the sampling assembly 4, the sampling assembly 4 can be stretched to adhere to the formation 10 and suck the formation 10 sample, the sucked formation 10 sample is detected by the contamination rate evaluation assembly 6, if qualified, it is transmitted to the storage tank assembly 7, and the fluid parameter assembly performs online mapping on the formation 10 sample; if the contamination rate evaluation assembly 6 detects that the formation 10 sample is unqualified, it is discharged to the annulus.

[0054] The tool according to the embodiment can sample the formation fluid while drilling through the sampling instructions sent from the ground, and online measure the contamination rate of the formation fluid 110, and store the qualified formation fluid 110 in the sample tank 7. Meanwhile, the tool provided by the present application also realizes online mapping of the properties of the formation fluid and transmission to the ground.

[0055] ​Through the tool described in the embodiment, the formation fluid 110 can be sampled while drilling and the key properties of the formation fluid can be measured on-line. Compared with the cable sampling tool, the formation is opened for a short time when the tool samples, the near wellbore of the wellbore is less polluted by the mud invasion filtrate, and the original formation fluid is more easily obtained. In addition, in the conventional cable sampling restricted environment such as a high-deviation well, a horizontal well, a large displacement well, and the like, the tool described in the embodiment can be applied to sample the formation fluid.

[0056] The embodiment utilizes the drilling fluid sampling technology to rapidly collect the low-polluted or unpolluted formation fluid 110 when the oil and gas layer is just opened. Compared with the cable fluid sampling, the operation time is shorter, and the formation data obtained is more real.

[0057] In one embodiment, as shown in Figure 3 The outer housing 2 includes a body 21 for mounting the power system 5. The upper end of the body 21 is provided with an instrument cabin housing 22 and an upper housing 23 for mounting the downhole control assembly 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 assembly 4. The lower end of the sampling drill collar 24 is provided with a measuring drill collar 25 for mounting the fluid parameter measuring assembly 8. The bottom end of the measuring drill collar 25 is provided with a double male joint 26. The upper housing 23, the instrument cabin housing 22, the body 21, the sampling drill collar 24, the measuring drill collar 25, and the double male joint 26 are connected by threads.

[0058] The outer housing 2 is divided into multiple sections and connected by threads. The connection is not only stable and sealed, but also facilitates disassembly and assembly of other assemblies. When assembling the assemblies, the control assembly 9 and the power system 5 are mounted on the instrument cabin housing 22 and the upper housing 23, the sampling assembly 4 is mounted on the sampling drill collar, and the tank assembly 7 and the fluid parameter measuring assembly 8 are mounted in the measuring drill collar 25. Then, the upper housing 23, the instrument cabin housing 22, the body 21, the measuring drill collar 25, the measuring drill collar 25, and the double male joint 26 are connected by threads to complete the assembly.

[0059] In one embodiment, as shown in Figure 2As shown, the power supply assembly 3 is arranged in the upper housing 23 inside the instrument cabin housing 22. The power supply assembly 3 can be a mud generator or a large-capacity battery pack. The power supply assembly 3 is connected to other units requiring power supply through a line. In this embodiment, the power supply assembly 3 includes a rectifier and voltage stabilizing circuit, a main control circuit, a push drive circuit 33, a suction drive circuit 34, and an electromagnetic valve control circuit. The push drive circuit 33 provides power and control for the power assembly 51, and the suction drive circuit 34 provides power and control for the suction assembly 52 and the contamination rate evaluation assembly 6. The electromagnetic valve control circuit provides power and system control for the storage tank assembly 7 and the fluid parameter measurement assembly 8.

[0060] The instrument cabin carrier is arranged inside the instrument cabin housing 22 and fixed, and sealed by the sealing ring set 32. The upper part of the instrument cabin carrier is connected to the power supply assembly 3 through a slip ring 31, which can ensure that the electrical connection is maintained when rotating or sliding.

[0061] The power supply assembly 3 ensures the power supply of each power-consuming component in the downhole part, ensuring the smooth progress of sampling and online mapping work.

[0062] In one embodiment, as shown in Figure 4 The power system 5 includes a power assembly 51 and a suction assembly 52. The body 21 is provided with a first open slot 212 and a second open slot 213 for mounting the power assembly 51 and the suction assembly 52, respectively, and sealed by a first gland 211 (as shown in Figure 6 and a second gland (not shown in Figure 6 ) arranged opposite to the first gland 211. The power assembly 51 is placed in the first open slot 212 of the body 21 and bolted tightly by the first gland 211. The power assembly 51 provides power for the sampling assembly 4 to extend and retract against the formation 10, and the suction assembly 52 provides power for the sampling assembly 4 to suck the formation 10 sample.

[0063] During the process of sucking the 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 through suction. During the sucking process, the power assembly provides power for the sampling assembly 4 to extend and retract, and the suction assembly 52 provides power for the sampling assembly 4 to suck.

[0064] Preferably, the power assembly 51 in the power system 5 uses hydraulic pressure to provide power for the sampling assembly 4 to extend into the formation 10, and then controls the sampling assembly 4 to suck the formation 10 sample through the suction assembly 52, completing the collection. Then, the sampling assembly 4 is controlled to retract by the power assembly 51.

[0065] In one embodiment, as shown in Figure 3As shown, the sampling drill collar 24 is provided with a helical wing 251 with an outer diameter slightly smaller than the borehole diameter, and the helical wing 251 is provided with a through-hole slot 252 for mounting the sampling assembly 4.

[0066] In a preferred embodiment, as shown, the sampling assembly 4 comprises a probe assembly 41 for sampling, the probe assembly 41 is provided with a filter 42, the bottom of the probe assembly 41 is provided with a push piston 43, and the two sides are respectively provided with independent recovery mechanisms 44. The push piston 43 is connected to the power assembly 51, and is driven to extend or retract by the power assembly 51, thereby driving the probe assembly 41 to extend or retract. The probe assembly 41 is driven by the suction assembly 52 to extract the formation 10 sample, and the filter 42 can filter large particles or other impurities. The probe assembly 41 is connected to the suction assembly 52, and the push piston 43 is connected to the power assembly 51. The recovery mechanism 44 can be a spring mechanism, other elastic device or a hydraulic mechanism, as long as it can make the probe assembly 41 return to the original position. Figure 5

[0067] When sampling fluid, the sampling assembly 4 is driven by the hydraulic drive of the power assembly 51, the push piston 43 extends outward, the sealing ring on the probe assembly 41 contacts the inner wall of the formation 10, and under the action of the thrust, the other side of the sampling drill collar 24 contacts the inner wall of the formation 10. After the probe assembly 41 is extended to the position, the suction assembly 52 is activated, and the probe of the probe assembly 41 starts to suck the formation fluid 110, and the sampling is completed. After the sampling is completed, the probe assembly 41 is recovered to the initial state by the recovery force of the recovery mechanism 44.

[0068] The pipeline connecting the probe assembly 41 and the suction assembly 52 is provided with a differential pressure sensor 45, and the differential pressure sensor 45 is connected to the push drive circuit 33, and the differential pressure is detected to determine whether the probe of the probe assembly 41 is extended to the position.

[0069] The push drive circuit 33 is connected to the push drive circuit cable 331 through the push drive circuit connector 332, and the push drive circuit cable 331 is connected to the servo motor through the multi-core connector 335.

[0070] The power piston 516 extends or retracts, and outputs the hydraulic oil in the piston cavity 517 to the push piston 43, controls the extension and retraction of the push piston 43, thereby controls the extension and recovery of the probe assembly, and the differential pressure sensor 45 is used to accurately collect the output pressure.

[0071] During the process, the downhole control assembly 9 records the number of motor revolutions through the encoder feedback, calculates the piston actuation distance and the final probe extension height, and combines the system output pressure to provide a basis for judging whether the probe assembly is extended to the position.

[0072] ​In one embodiment, as shown in Figure 4 and Figure 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 connected in sequence. The power assembly 51 contains a multi-core connector 335, which is connected to the push-pull driving circuit 33 of the power supply assembly 3 through a push-pull driving cable and the multi-core connector 335, and executes the action instructions issued by the push-pull driving circuit 33. The power piston 516 provides power for the extension and retraction of the sampling assembly 4.

[0073] The piston cavity 517 of the power piston 516 is connected to the push-pull piston 43 through a mud passage 519, and a first pressure sensor 518 and a first hard alloy impact ring 333 are arranged in the mud passage 519. The first hard alloy impact ring 333 is connected to the push-pull driving circuit connection block pipeline 522334. The first pressure sensor 518 is connected to the push-pull driving circuit 33 through the first hard alloy impact ring 333 and the push-pull driving circuit connection block pipeline 522334, and feeds back the pressure of the power piston 516. The push-pull driving circuit 33 judges the state of the power piston 516 according to the pressure value.

[0074] The servo motor 511 is indirectly connected to the lead screw 515 through a connecting shaft, a reducer 513 and a bearing set 514, and drives the lead screw 515 to rotate forward or reverse. The lead screw 515 drives the power piston 516 to extend or retract, and transports the hydraulic pressure in the piston cavity 517 of the power piston 516 to the bottom of the suction probe of the sampling assembly 4 or withdraws from the bottom of the suction probe, thereby driving the suction probe to extend or retract, and further controlling the extension and retraction of the sampling assembly 4 and the contact or separation with the formation 10.

[0075] In one embodiment, as shown in Figure 2 The suction assembly 52 and the contamination rate evaluation assembly 6 are assembled into an integral whole and placed in the second opening groove 213 of the body 21 and pressed by a second gland. The integral whole formed by the suction assembly 52 and the contamination rate evaluation assembly 6 is connected to the suction pump 521 through a pipeline 522. The suction pump 521 is connected to the sampling assembly 4 through a flow passage 525, and the formation fluid 110 is sucked into the contamination rate evaluation assembly 6 by the suction of the suction pump 521.

[0076] Preferably, the suction driving circuit 34 is connected to a suction driving circuit connector 342 through an instrument cabin pipeline 341, and then connected to the suction assembly 52 through a suction driving circuit cable 343. A side wall hole 523 is further arranged on the side wall of the body 21, which communicates the contamination rate evaluation assembly 6 and the external annulus. A switch valve 524 is arranged on the side wall hole 523, which is used to discharge unqualified samples.

[0077] The pumping assembly 52 pumps the formation fluid 110 from the formation 10 through the flow channel 525 to the contamination rate evaluation assembly 6 via the tubing 522. The sample with contamination rate failure is discharged to the wellbore annulus through the side wall hole 523 after the switch valve 524. The sample with contamination rate passing is discharged to the storage tank assembly 7 via the pumping assembly 52. The pressure sensor in the pumping assembly 52 can record the fluid pressure of the tubing 522 in front of the pumping assembly 52.

[0078] The pressure sensor is connected to the pumping drive circuit 34 via the pumping drive circuit cable 343 and the second hard alloy impact ring. The pressure sensor feeds back the detected pressure information to the pumping drive circuit, which provides the basis for the pumping drive circuit to control pumping.

[0079] The body 21 is circumferentially symmetrically provided with three or four open grooves (as shown in Figure 7 The first open groove 212 and the second open groove 213 are respectively arranged for the power assembly 51 and the pumping assembly 52. The remaining open grooves are the third open groove and the fourth open groove arranged selectively, which are arranged for the oil liquid compensation system to provide pressure compensation for the power assembly 51 and the pumping assembly 52 under high pressure conditions downhole.

[0080] In an embodiment, as shown in Figure 2 The storage tank assembly 7 and the fluid parameter measurement assembly 8 are arranged inside the sampling drill collar 25, and the upper and lower ends are pressed by the connecting block and the double male joint 26. The storage tank assembly 7 includes several separate sample tanks 71, preferably 3 or 4 sample tanks 71. The middle of the storage tank assembly 7 is provided with a drilling fluid flow channel 72, and the upper end is provided with a switch valve 524 and a multi-way passage electromagnetic valve.

[0081] The multi-way passage electromagnetic valve 81 is connected to each separate sample tank 71, which can control the formation fluid 110 sample to enter different sample tanks 71 for storage. The fluid parameter measurement assembly 8 is connected to the conversion joint 75 via the tubing 522. When the switch valve 524 is in the open position, the formation fluid 110 enters the fluid parameter measurement assembly 8 via the tubing 522, which realizes online measurement, data storage and uploading of the viscosity, density and composition of the formation fluid 110.

[0082] In one embodiment, the while-drilling formation fluid sampling and fluid online mapping tool is provided with a flow channel for circulating drilling fluid, which includes an instrument bin carrier channel, a sidewall hole 523, an upper end pipeline 527, a pipeline 522, a right mud channel 519, a flow channel 525, a hard alloy impact ring of suction drive circuit 34, a mud channel 519, a hard alloy impact ring of push drive circuit 33, a suction drive circuit 34 connecting block pipeline 522, a hydraulic hole 47, a first pipeline 73, a second pipeline 74, a fluid parameter measurement assembly pipeline 82, a suction drive circuit 34 connecting block pipeline 522, and a hydraulic pipeline 522.

[0083] In a preferred embodiment, the ground control system 1 is connected with a ground pulse transmitter 11, a mud pit 12, and a mud pump 13, and the ground pulse transmitter 11 transmits mud through a ground pulse generator to emit a pressure pulse signal.

[0084] The sampling and mapping work using the while-drilling formation fluid sampling and fluid online mapping tool according to the present embodiment is as follows:

[0085] First, the tool according to the present embodiment is connected to the drilling 111 and is lowered into the wellbore together with the drilling tool 111 during normal drilling operation. When it is decided to sample the formation fluid 110, a sampling instruction is sent through the ground control system 1, and the ground pulse generator is controlled to emit a pressure pulse signal.

[0086] After receiving the sampling instruction sent from 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, and the servo motor 511 rotates forward through the shaft coupling 512, the reducer 513, and the bearing set 514, etc. to the lead screw 515, driving the lead screw 515 to rotate forward. The lead screw 515 rotates forward due to the action of the thread to make the power piston 516 extend, and the power piston 516 transmits power to the push piston 43, which pushes the probe assembly 41 to extend and enter the formation 10, and the other side is tightly attached to the well wall.

[0087] After the extension is completed, the suction pump 521 in the suction assembly 52 starts to work, and the suction pump sucks the formation fluid 110 from the formation 10. After being filtered by the probe filter 42, the formation fluid 110 enters the contamination rate evaluation assembly 6.

[0088] The pollution rate evaluation assembly 6 detects whether the sample is qualified. The unqualified sample is discharged through the side wall hole 523, and the qualified sample enters the sample tank 71 through the pipeline 522 to be stored, and part of the sample enters the fluid parameter measurement assembly 8 to realize online measurement of the formation fluid 110 sample. After sampling is completed, the servo motor 511 in the power assembly 51 is reversed, and the probe assembly 41 is recovered under the joint action of the recovery mechanism 44 in the probe assembly to return to the initial state.

[0089] The sample entering the sample tank 71 is measured by the fluid parameter measurement assembly 8 to measure the viscosity, density, composition and other data of the formation fluid 110, and the data is stored and uploaded to the ground.

[0090] In the present application, the upper side is the direction close to the wellhead, and the lower side is the direction away from the wellhead.

[0091] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A formation fluid sampling and fluid mapping while drilling tool, comprising: The application relates to a downhole sampling and measuring device. The device comprises: a ground control system (1) for sending control instructions downhole; and a downhole part comprising: an outer shell (2), a downhole control assembly (9) for receiving the control instructions from the ground control system (1) and controlling sampling and online mapping, a sampling assembly (4) configured to suck a formation (10) sample, a power system (5) for providing power for the sampling assembly (4) to extend and suck the sample, a storage assembly (7) for storing qualified formation (10) samples, a contamination rate evaluation assembly (6) for judging whether the contamination rate of the formation (10) sample is qualified, discharging unqualified formation (10) samples, and transmitting qualified formation (10) samples into the storage assembly (7), and a fluid parameter measuring assembly (8) for measuring the parameters of the formation (10) sample in the storage assembly (7) and feeding back the measured data to the ground control system (1); the outer shell (2) comprises a body (21) for mounting the power system (5); an instrument cabin shell (22) and an upper shell (23) are arranged at the upper end of the body (21) and used for mounting the downhole control assembly (9); a sampling drill collar (24) is arranged at the lower end of the body (21) and used for mounting the sampling assembly (4); and a measuring drill collar (25) is arranged at the lower end of the sampling drill collar (24) and used for mounting the fluid parameter measuring assembly (8); the power system (5) comprises a power assembly (51) for providing power for the sampling assembly (4) to extend and a suction assembly (52) for providing power for the sampling assembly (4) to suck the formation (10) sample; first and second open grooves (212) and (213) are arranged on the body (21) and used for mounting the power assembly (51) and the suction assembly (52) respectively and are sealed by first and second gland nuts (211); the sampling assembly (4) comprises a probe assembly (41), a filter (42) is arranged on the probe assembly (41), a push piston (43) is arranged at the bottom of the probe assembly (41), and recovery mechanisms (44) are arranged at the two sides of the probe assembly (41) respectively; wherein the probe assembly (41) is connected with the suction assembly (52), the push piston (43) is connected with the power assembly (51); the power assembly (51) comprises a servo motor (511), the power input end of the servo motor (511) is connected with a push driving circuit (33), and the output end is connected with a lead screw (515); the lead screw (515) is connected with a power piston (516), and the rotation of the lead screw (515) drives the power piston (516) to extend and retract; wherein the power piston (516) is connected with the push piston (43) through a mud channel (519); the suction assembly (52) and the contamination rate evaluation assembly (6) are assembled as a whole, the suction assembly (52) and the contamination rate evaluation assembly (6) are connected with a suction pump (521) through a pipeline (522), the suction pump (521) is communicated with the probe assembly (41) through a flow channel (525), and the rear end of the suction assembly (52) is connected with a suction driving circuit (34). The sidewall of the body (21) is further provided with a sidewall hole (523) communicating the pollution rate evaluation assembly (6) and the outside annulus; wherein the suction pump (521) pumps the formation (10) sample extracted by the probe assembly (41) to the pollution rate evaluation assembly (6); the pollution rate evaluation assembly (6) discharges the unqualified formation (10) sample through the sidewall hole (523) and delivers the qualified formation (10) sample into the storage tank assembly (7).

2. The formation fluid sampling and fluid profiling-while-drilling tool of claim 1, wherein, The instrument cabin shell (22) is provided with a power supply assembly (3) installed therein, and the power supply assembly (3) comprises a rectifier and voltage stabilizer circuit, a main control circuit, a push driving circuit (33), a suction driving circuit (34) and a solenoid valve control circuit.

3. The formation fluid sampling and fluid profiling while drilling tool of claim 2, wherein, The sampling drill collar (24) is provided with a spiral wing (251) with an outer diameter slightly smaller than the borehole diameter, and the spiral wing (251) is provided with a through hole slot (252) for mounting the sampling assembly (4).

4. The formation fluid sampling and fluid profiling while drilling tool of claim 3, wherein, The end of the probe assembly (41) is provided with a differential pressure sensor (45) connected to the push driving circuit (33).

5. The formation fluid sampling and fluid profiling while drilling tool of claim 3, wherein, The storage tank assembly (7) comprises a plurality of sample tanks (71), and the sample tanks (71) are connected to the pollution rate evaluation assembly (6) through a multi-way solenoid valve (81) and a switch valve (524) to receive qualified samples.

6. The formation fluid sampling and fluid profiling while drilling tool of claim 5, wherein, The storage tank assembly (7) and the fluid parameter measurement assembly (8) are placed inside the sampling drill collar (25), and the fluid parameter measurement assembly (8) measures the parameters of the formation (10) sample and uploads to the ground control system (1).

7. The formation fluid sampling and fluid profiling while drilling tool of claim 6, wherein, The fluid parameter measurement assembly (8) is connected to a conversion joint (75) through a pipeline (522), and the conversion joint (75) is connected to the switch valve (524); when the switch valve (524) is in the open position, the formation fluid (110) enters the fluid parameter measurement assembly (8) through the pipeline (522).

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