Accurate well cementation fluid allocation equipment and allocation method for shale gas exploitation

Abstract

The invention discloses precise well cementation fluid rationing equipment for shale gas exploitation and a rationing method. The equipment comprises a supporting assembly, a quantifying assembly and a mixing assembly. The supporting assembly comprises a supporting sleeve and a chuck; the quantifying assembly comprises a batching barrel arranged on the chuck, a weighing instrument arranged on the supporting sleeve and a rotating motor arranged at the bottom end of the supporting sleeve; the mixing assembly comprises a mixing cylinder arranged at the bottom end of the supporting sleeve, and a mixing motor and a stirrer which are arranged at the top in the mixing cylinder; the equipment is reasonable in structural design, different cementing fluid raw materials are accurately weighed through the cooperation effect of the batching barrel and the weighing instrument, and the matching accuracy of all components of the cementing fluid is improved; meanwhile, according to the equipment, all raw materials of the cementing fluid can be automatically transferred, the working intensity of manual operation is reduced, all the raw materials of the cementing fluid are fully stirred and mixed through the mixing assembly, and therefore the acting effect of the cementing fluid is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield cementing, and in particular to a cementing fluid precise dispensing device and a dispensing method for shale gas development. Background Art

[0002] Cementing operation is one of the most important links in oil and gas well drilling engineering. Its main purpose is to isolate the oil layer, gas layer and water layer in the wellbore, protect the oil and gas well casing, increase the life of the oil and gas well and improve the oil and gas production. It is an engineering technical measure to use mechanical pressure or slurry self-weight pressure to press the cementing fluid with gelling solid particles or chemical solution into rock cracks, gravel gaps, joints between concrete dam sections, rock and concrete contact zones or other parts that need grouting through drilling or other facilities at a specified concentration.

[0003] Cementing fluid is prepared from a variety of raw materials in a certain ratio. In the prior art, when preparing cementing fluid, workers pour various raw materials into a mixing tank on site for mixing and preparing, and the ratio of each material is difficult to control accurately. Moreover, the various raw materials are only simply mixed, which makes it difficult to ensure the use effect of the cementing fluid, and brings safety hazards to the later treatment of the cementing fluid. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present invention provides a precise dispensing device and method for cementing fluid used in shale gas development.

[0005] The technical solution of the present invention is: a cementing fluid precision dispensing device used in shale gas development, comprising a support assembly, a quantitative assembly arranged on the support assembly, and a mixing assembly arranged at the lower end of the support assembly; the support assembly comprises a support sleeve and a chuck sleeved on the outside of the support sleeve;

[0006] The quantitative assembly includes a plurality of dosing barrels clamped on the chuck, a weighing instrument sleeved on the supporting sleeve, and a rotating motor arranged at the bottom end of the supporting sleeve; a threaded screw connected to the chuck is arranged at the output end of the rotating motor;

[0007] The mixing assembly includes a mixing barrel arranged at the bottom end of a supporting sleeve, a mixing motor arranged at the top of the mixing barrel, and an agitator arranged at the output end of the mixing motor; a plurality of feed holes are arranged through the top end of the mixing barrel, and an electric heating jacket is arranged inside the mixing barrel; the agitator includes a main shaft arranged at the output end of the mixing motor and a plurality of mixing plates equidistantly distributed around the main shaft, and each mixing plate is penetrated by a flow groove.

[0008] Furthermore, a lifting plate sleeved on the supporting sleeve is rotatably clamped inside the chuck, and an engaging member capable of being connected to the threaded screw is arranged inside the lifting plate; a conical discharge head is slidably clamped on the inner bottom of each batching barrel, and a first electric rod connected to the conical discharge head is arranged inside the batching barrel;

[0009] Description: The lifting plate is connected to the threaded screw by using an engaging member, so that the lifting plate drives the chuck and the dosing barrel to move downward along the support sleeve under the action of the threaded screw, and the bottom end of the dosing barrel is inserted into the feed hole on the mixing barrel, and the movable baffle is pushed open. At this time, the first electric rod is used to push the conical discharge head to move downward along the inner wall of the dosing barrel to put the material into the mixing barrel; the convenience of material transfer is improved, and the accuracy of the cementing fluid raw material ratio is avoided due to the scattering of materials during manual transfer.

[0010] Furthermore, the embracing member includes a plurality of threaded blocks slidably engaged with the inside of the lifting plate, a driving plate rotatably engaged with the inside of the lifting plate, and a second electric rod arranged inside the lifting plate and connected to the driving plate. The driving plate is provided with arc-shaped advancement grooves at positions corresponding to the positions of the threaded blocks. The threaded blocks are movably engaged with the arc-shaped advancement grooves at corresponding positions through bayonet pins. The supporting sleeve is provided with a through groove for the threaded blocks to slide.

[0011] Description: When in use, the second electric rod is used to push the driving disk to rotate. The pins on each threaded block slide inside the arc-shaped propulsion groove on the driving disk, driving each threaded block to pass through the through groove and connect with the threaded screw. At this time, the lifting disk can move up and down with the rotation of the threaded screw.

[0012] Furthermore, a collecting hopper is arranged inside each mixing barrel and at a position corresponding to the position of the movable baffle, a conduit is horizontally arranged at the lower end of each collecting hopper, a discharge trough is arranged at the lower end of the conduit, a material receiving column is rotatably connected inside the conduit, a fan-shaped transfer groove is arranged on the material receiving column, a first bevel gear is arranged at one end of the material receiving column close to the mixing motor through a connecting shaft, and a second bevel gear meshingly connected with the first bevel gear is sleeved on the main shaft;

[0013] Description: The materials inside each batching barrel first fall into the corresponding collecting bucket. During the rotation of the main shaft, the meshing action of the second bevel gear and each first bevel gear is used to make each connecting shaft and the material receiving column rotate simultaneously. During the rotation of the material receiving column, the material enters the fan-shaped transfer groove and falls into the mixing barrel through the discharge groove at the lower end of the conduit, realizing the intermittent delivery of various materials, which is beneficial to improve the mixing uniformity of various materials and improve the effect of cementing fluid in shale gas development.

[0014] Furthermore, a horizontal bar is provided inside the flow tank, and auxiliary mixing plates perpendicular to the mixing plates are provided on both sides of the horizontal bar;

[0015] Note: During the rotation of the mixing plate, the material flows through the flow trough, and the auxiliary mixing plate is used to cut the flowing material, which is beneficial to improve the mixing efficiency of the material.

[0016] Furthermore, a vibration rod connected to the horizontal rod is slidably connected inside the mixing plate, a vibration spring abutting against the inner wall of the mixing plate is arranged at the top of the vibration rod, and a vibration roller is rotatably connected at the bottom; an annular vibration rail abutting against the vibration roller is arranged at the bottom of the mixing cylinder;

[0017] Description: During the rotation of the mixing plate, the vibration roller moves on the annular vibration rail, driving the corresponding vibration rod to move up and down inside the mixing plate, and driving the horizontal rod to move up and down inside the corresponding flow groove, thereby changing the mixing path of the auxiliary mixing plate, further improving the use effect of the agitator of the present invention, and improving the preparation efficiency of the cementing fluid.

[0018] The present invention also provides a method for accurately dispensing cementing fluid for shale gas development, based on the above-mentioned accurate dispensing device for cementing fluid for shale gas development, comprising the following steps:

[0019] S1. Use a rotary motor to drive the threaded screw to rotate, so that the chuck drives one of the batching barrels to rotate above the weighing instrument, and then inject the raw materials for the cementing fluid into the batching barrel, and use the weighing instrument to weigh the weight of the raw materials in the batching barrel;

[0020] S2, repeating step S1, using different batching barrels and weighing instruments to weigh various raw materials for the cementing fluid; then injecting the raw materials in each batching barrel into the mixing barrel through the feed holes on the mixing barrel;

[0021] S3. Use a mixing motor to drive the agitator to rotate, heat the various raw materials inside the mixing barrel to 55-75°C using an electric heating jacket, and continue stirring at a stirring speed of 1250-1550r / min for 25-40min to obtain the required cementing fluid.

[0022] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0023] First, the equipment structure of the present invention is reasonably designed, and the various raw materials of the cementing fluid are accurately weighed by using the cooperation of each batching barrel and the weighing instrument, which reduces the difficulty of manual operation and improves the preparation efficiency of the cementing fluid;

[0024] Second, the present invention uses a rotating motor to make the chuck and the batching barrel descend at the same time and dock with the mixing barrel, so that the raw materials in each batching barrel can be automatically transferred to the mixing barrel for stirring and mixing, avoiding the residual raw materials in the batching barrel and affecting the accuracy of the ratio between the raw materials of the cementing fluid;

[0025] Third, the raw materials entering the mixing barrel first enter the collecting bucket, and intermittently fall to the bottom of the mixing barrel under the rotation of the receiving column, which lays a foundation for the mixing and stirring of the raw materials; when the mixing plate of the present invention rotates, the mixed raw materials pass through the flow groove and are divided and mixed by the auxiliary mixing plate, and at the same time, when the vibration roller rolls on the annular vibration rail, it can drive the vibration rod and the auxiliary mixing plate to move up and down inside the flow groove, thereby improving the mixing efficiency of the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a longitudinal sectional view of the apparatus of the present invention;

[0027] Figure 2 is a front view of the device of the present invention;

[0028] Figure 3 It is a schematic diagram of the connection between the lifting plate and the chuck of the present invention;

[0029] Figure 4 It is a distribution diagram of the clamping holes on the clamping plate of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the dispensing barrel of the present invention;

[0031] Figure 6 The present invention Figure 1 A local enlarged schematic diagram of the middle A;

[0032] Figure 7 It is a schematic diagram of the connection between the agitator and the mixing drum of the present invention;

[0033] Figure 8 It is a schematic diagram of the connection between the horizontal rod and the mixing plate of the present invention;

[0034] Fig. 9 It is a schematic diagram of the connection between the collecting bucket and the mixing cylinder of the present invention;

[0035] Fig.10 It is a schematic diagram of the connection between the material receiving column and the collecting bucket of the present invention;

[0036] Fig.11 It is a schematic diagram of the connection between the embracing member and the lifting plate of the present invention;

[0037] Among them, 1-support assembly, 10-support sleeve, 100-through groove, 11-chuck, 110-pull rod, 111-position hole, 112-guide sleeve, 12-equipment box, 13-rotating cap, 14-lifting plate, 15-wear-resistant block, 2-quantitative assembly, 20-dosing barrel, 200-injection pipe, 201-ball seat, 21-weighing instrument, 210-through bracket, 22-rotating motor, 220-threaded screw, 23-conical discharge head, 230-limiting column, 24-first electric rod, 3-mixing assembly, 30-mixing barrel, 300-feeding hole, 301-discharge pipe, 31-mixing motor, 32-agitator, 320-spindle, 321-mixing plate, 3210-flow trough, 322-horizontal rod, 323-auxiliary mixing plate, 324-vibration rod, 3240-vibration spring, 3241-vibration roller, 325-annular vibration rail, 33-movable baffle, 330-slide rod, 331-reset spring, 34-electric heating sleeve, 35-collecting bucket, 350-conduit, 3500-discharge trough, 351-receiving column, 3510-fan-shaped transfer trough, 352-connecting shaft, 353-first bevel gear, 354-second bevel gear, 4-embracing member, 40-threaded block, 400-pin, 41-driving disk, 410-arc-shaped propulsion groove, 42-second electric rod. DETAILED DESCRIPTION

[0038] Example 1

[0039] like Figure 1 , 4 A cementing fluid precise dispensing device for shale gas development is shown, comprising a support assembly 1, a quantitative assembly 2 arranged on the support assembly 1, and a mixing assembly 3 arranged at the lower end of the support assembly 1; the support assembly 1 comprises a support sleeve 10 and a chuck 11 sleeved on the upper end of the outer wall of the support sleeve 10, an equipment box 12 is arranged at the bottom end of the support sleeve 10, a rotating cap 13 is movably clamped at the top end of the support sleeve 10, a pull rod 110 connected to the side wall of the rotating cap 13 is arranged on the chuck 11, and four clamping holes 111 are evenly distributed on the chuck 11;

[0040] like Figure 1 , 2 As shown, the quantitative component 2 includes four dispensing barrels 20 that are slidably engaged in the locking holes 111 in a one-to-one manner, a weighing instrument 21 that is sleeved on the support sleeve 10 through a bracket 210 and is located below the chuck 11, and a rotating motor 22 that is arranged inside the equipment box 12; a material injection tube 200 is arranged at the top of the dispensing barrel 20, and a ball seat 201 is rotatably engaged at the bottom; a threaded screw 220 that is sleeved in the support sleeve 10 is arranged at the output end of the rotating motor 22, and the top end of the threaded screw 220 passes through the support sleeve 10 and is connected to the rotating cap 13;

[0041] like Figure 1 ,2 As shown in Figures 6, 7 and 8, the mixing assembly 3 includes a mixing drum 30 arranged at the bottom end of the equipment box 12, a mixing motor 31 arranged at the top of the mixing drum 30 and an agitator 32 arranged at the output end of the mixing motor 31; a feeding hole 300 is arranged through the top of the mixing drum 30, a movable baffle 33 is arranged at the top of the mixing drum 30 and corresponding to the position of the feeding hole 300, a sliding rod 330 is arranged at the top of the mixing drum 30 for sliding engagement with the movable baffle 33, and a return spring 331 abutting against the lower bottom surface of the movable baffle 33 is sleeved on the sliding rod 330; a discharge pipe 301 is arranged at the lower end of the side wall of the mixing drum 30, and an electric heating sleeve 34 is sleeved inside; the agitator 32 includes a main shaft 320 arranged at the output end of the mixing motor 31 and four mixing plates 321 equidistantly distributed around the main shaft 320, and each mixing plate 321 is penetrated by a flow groove 3210.

[0042] Example 2

[0043] This embodiment describes a method for accurately dispensing cementing fluid for shale gas development, and a device for accurately dispensing cementing fluid for shale gas development based on Embodiment 1, comprising the following steps:

[0044] S1. Clamp each batching barrel 20 into the clamping hole 111 on the chuck 11, and then use the rotating motor 22 to drive the threaded screw 220 to rotate, so that the chuck 11 drives one of the batching barrels 20 to rotate above the weighing instrument 21. During the movement of the batching barrel 20, the ball seat 201 at the bottom thereof first contacts the weighing instrument 21, so that the entire weight of the batching barrel 20 is pressed on the weighing instrument 21; then, inject the raw materials for the cementing fluid into the batching barrel 20, and use the weighing instrument 21 to weigh the weight of the raw materials inside the batching barrel 20;

[0045] S2, repeating step S1, using different batching barrels 20 and weighing instruments 21 to weigh various raw materials for the cementing fluid; then injecting the raw materials in each batching barrel 20 into the mixing barrel 30 through the feed hole 300 on the mixing barrel 30; when the batching barrel 20 enters the feed hole 300, the movable baffle 33 is pressed down to separate the movable baffle from the feed hole 300; when the batching barrel 20 separates from the movable baffle 33, the movable baffle 33 is moved up along the slide rod 330 under the action of the return spring 331, and the feed hole 300 is closed;

[0046] S3. The main shaft 320 and the mixing plate 321 are driven to rotate by the mixing motor 31, and various raw materials in the mixing barrel 30 are heated to 55° C. by the electric heating jacket 34, and stirred continuously for 25 minutes at a stirring speed of 1250 r / min to obtain the desired cementing fluid.

[0047] Example 3

[0048] The difference between this embodiment and embodiment 1 is that:

[0049] like Figure 3 , 5 As shown in 11, the lifting plate 14 sleeved on the supporting sleeve 10 is rotatably engaged with the inner side of the chuck 11, and the pull rod 110 is slidably engaged with the side wall of the rotating cap 13; the lifting plate 14 is provided with an engaging member 4 that can be connected to the threaded screw 220; the inner bottom of each batching barrel 20 is slidably engaged with a conical discharge head 23, and the batching barrel 20 is provided with a first electric rod 24 connected to the conical discharge head 23; the number of the feed holes 300 corresponds to that of the batching barrel 20; the engaging member 4 includes The invention comprises four threaded blocks 40 which are slidably engaged with the inside of the lifting plate 14, a driving plate 41 which is rotatably engaged with the inside of the lifting plate 14, and a second electric rod 42 which is arranged inside the lifting plate 14 and connected with the driving plate 41. The driving plate 41 is provided with arc-shaped advancing grooves 410 at positions corresponding to the positions of the threaded blocks 40. The threaded blocks 40 are movably engaged with the arc-shaped advancing grooves 410 at corresponding positions through the bayonet pins 400. The supporting sleeve 10 is provided with a through groove 100 for the threaded blocks 40 to slide.

[0050] In this embodiment, the holding member 4 can be used to threadably connect the lifting plate 14 with the threaded screw 220. Under the action of the threaded screw 220, the lifting plate 14 can drive the chuck 11 and the dosing barrel 20 to move downward along the support sleeve 10. After the dosing barrel 20 is docked with the feed hole 300 on the mixing barrel 30, the first electric rod 24 is used to push the conical discharge head 23 to move downward along the inner wall of the dosing barrel 20, so that the material can be put into the mixing barrel 30, which improves the convenience of transferring the dosing barrel 20 and reduces the labor intensity of workers.

[0051] Example 4

[0052] This embodiment describes a method for accurately dispensing cementing fluid for shale gas development, and describes an accurate dispensing device for cementing fluid for shale gas development based on Embodiment 3, which differs from Embodiment 2 in that:

[0053] In step S2, after the weighing of each raw material is completed, the rotary motor 22 is used to drive the chuck 11 to rotate a certain angle so that the weighing instrument 21 is located in the gap between two adjacent batching barrels 20; then the second electric rod 42 is used to drive the driving disk 41 to rotate. During the rotation of the driving disk 41, the latch 400 on each threaded block 40 slides inside the arc-shaped propulsion groove 410 on the driving disk 41 and drives each threaded block 40 to pass through the through groove 100 and connect with the threaded screw 220; the rotary motor 22 is used to drive the threaded screw 220 to rotate, and the lifting plate 14 drives the chuck 11 and the batching barrel 20 to move downward along the supporting sleeve 10 under the action of the threaded screw 220, and each makes the bottom end of the batching barrel 20 inserted into the feeding hole 300 on the mixing barrel 30, and at this time, the first electric rod 24 is used to push the conical discharge head 23 to move downward along the inner wall of the batching barrel 20 to put the material into the mixing barrel 30;

[0054] In step S3, various raw materials in the mixing drum 30 are heated to 60° C. by the electric heating jacket 34 and stirred for 35 minutes at a stirring speed of 1300 r / min.

[0055] Example 5

[0056] The difference between this embodiment and embodiment 3 is that:

[0057] like Figure 5 As shown, a limiting column 230 is provided on the side wall of the conical discharge head 23 and is slidably engaged with the inner wall of the dispensing barrel 20;

[0058] In this embodiment, under the action of the limiting column 230, the conical discharge head 23 always moves up and down perpendicular to the batching barrel 20, thereby improving the stability of the connection between the conical discharge head 23 and the batching barrel 20, and also improving the sealing between the conical discharge head 23 and the batching barrel 20.

[0059] Example 6

[0060] The difference between this embodiment and embodiment 5 is that:

[0061] like Figure 2 As shown, guide sleeves 112 are provided on the bottom surface of the chuck 11 and at positions corresponding to the positions of the respective chuck holes 111;

[0062] In this embodiment, by setting a guide sleeve 112 on the chuck 11, the batching barrel 20 moves up and down inside the guide sleeve 112, thereby avoiding the friction between the batching barrel 20 and the positioning hole 111 interfering with the weighing accuracy of the weighing instrument 21, thereby improving the accuracy of the ratio of the various raw materials of the cementing fluid.

[0063] Example 7

[0064] The difference between this embodiment and embodiment 6 is that:

[0065] like Figure 1 , 9 As shown in FIG. 10 , a collecting hopper 35 is provided inside the mixing barrel 30 and at a position corresponding to each movable baffle 33. A conduit 350 is horizontally provided at the lower end of each collecting hopper 35. A discharge trough 3500 is provided at the lower end of the conduit 350. A material receiving column 351 is rotatably connected inside the conduit 350. A fan-shaped transfer groove 3510 is provided on the material receiving column 351. A first bevel gear 353 is provided at one end of the material receiving column 351 close to the mixing motor 31 through a connecting shaft 352. A second bevel gear 354 meshingly connected with each first bevel gear 353 is sleeved on the main shaft 320.

[0066] In this embodiment, during the rotation of the material receiving column 351, the fan-shaped transfer groove 3510 is used to transfer the material to the lower end of the inner part of the conduit 350, and discharged through the discharge groove 3500, thereby realizing the intermittent delivery of various materials and laying a foundation for improving the mixing uniformity of various raw materials in the cementing fluid.

[0067] Example 8

[0068] This embodiment describes a method for accurately dispensing cementing fluid for shale gas development, and describes an accurate dispensing device for cementing fluid for shale gas development based on Embodiment 7, which differs from Embodiment 4 in that:

[0069] In step S3, the materials in each batching barrel 20 first fall into the corresponding collecting bucket 35, and the mixing motor 31 is used to drive the main shaft 320 and the mixing plate 321 to rotate. During the rotation of the main shaft 320, the meshing action of the second bevel gear 354 and each first bevel gear 353 is used to make each connecting shaft 352 and the material receiving column 351 rotate simultaneously. During the rotation of the material receiving column 351, the material enters the fan-shaped transfer groove 3510 and falls into the mixing barrel 30 through the discharge groove 3500 at the lower end of the conduit 350. The materials are intermittently added into the mixing barrel 30, and the various raw materials in the mixing barrel 30 are heated to 75°C by the electric heating sleeve 34, and are continuously stirred for 40 minutes at a stirring speed of 1550r / min to obtain the required cementing fluid.

[0070] Example 9

[0071] The difference between this embodiment and embodiment 7 is that:

[0072] like Figure 7 , 8As shown, a horizontal rod 322 is arranged inside the flow groove 3210, and auxiliary mixing plates 323 perpendicular to the mixing plate 321 are arranged on both sides of the horizontal rod 322; a vibration rod 324 connected to the horizontal rod 322 is slidably engaged inside the mixing plate 321, a vibration spring 3240 abutting against the inner wall of the mixing plate 321 is arranged at the top of the vibration rod 324, and a vibration roller 3241 is rotatably engaged at the bottom; an annular vibration rail 325 abutting against the vibration roller 3241 is arranged at the bottom of the mixing barrel 30;

[0073] In this embodiment, the auxiliary mixing plate 323 that can move up and down inside the flow tank 3210 can cut the cementing fluid raw material at different heights, which is beneficial to improving the mixing efficiency of the cementing fluid raw material.

[0074] Example 10

[0075] This embodiment describes a method for accurately dispensing cementing fluid for shale gas development, and describes an accurate dispensing device for cementing fluid for shale gas development based on Embodiment 9, which differs from Embodiment 8 in that:

[0076] In step S3, during the rotation of the mixing plate 321, the material flows through the flow groove 3210, and the auxiliary mixing plate 323 is used to cut the flowing material; at the same time, after the vibration roller 3241 moves on the annular vibration rail 325, it drives the corresponding vibration rod 324 to move up and down inside the mixing plate 321, and drives the horizontal rod 322 to move up and down inside the corresponding flow groove 3210, thereby changing the mixing path of the auxiliary mixing plate 323.

[0077] Embodiment 11

[0078] The difference between this embodiment and embodiment 9 is that:

[0079] like Figure 3 As shown, a wear-resistant block 15 is sleeved on the top end of the support sleeve 10 and abuts against the inner wall of the rotating cap 13;

[0080] In this embodiment, by setting a wear-resistant block 15 at the top of the support sleeve 10, it is helpful to reduce the friction resistance of the rotating cap 13 when rotating on the support sleeve 10, which can not only reduce the wear of the support sleeve 10, but also reduce the power loss of the rotating motor 22.

[0081] It should be noted that the weighing instrument 21, rotating motor 22, first electric rod 24, hybrid motor 31, electric heating sleeve 34 and second electric rod 42 used in the present invention all adopt existing technologies, and are not specifically limited here. The corresponding products can be selected according to actual needs.

Claims

1. A cementing fluid precision dispensing device for shale gas development, characterized in that: The invention comprises a support component (1), a quantitative component (2) arranged on the support component (1), and a mixing component (3) arranged at the lower end of the support component (1); the support component (1) comprises a support sleeve (10) and a chuck (11) sleeved on the outside of the support sleeve (10); The quantitative assembly (2) comprises a plurality of dosing barrels (20) clamped on a chuck (11), a weighing instrument (21) sleeved on a supporting sleeve (10), and a rotating motor (22) arranged at the bottom end of the supporting sleeve (10); a threaded screw (220) connected to the chuck (11) is provided at the output end of the rotating motor (22); The mixing assembly (3) comprises a mixing barrel (30) arranged at the bottom end of a supporting sleeve (10), a mixing motor (31) arranged at the top of the mixing barrel (30), and an agitator (32) arranged at the output end of the mixing motor (31); a plurality of feed holes (300) are provided through the top end of the mixing barrel (30), and an electric heating jacket (34) is provided inside the mixing barrel (30); the agitator (32) comprises a main shaft (320) arranged at the output end of the mixing motor (31) and a plurality of mixing plates (321) equidistantly distributed around the main shaft (320), and each of the mixing plates (321) is provided with a flow groove (3210) through it.

2. The precise dispensing equipment for cementing fluid used in shale gas development according to claim 1, characterized in that: The inner side of the chuck (11) is rotatably clamped with a lifting plate (14) sleeved on the supporting sleeve (10), and the lifting plate (14) is provided with an engaging member (4) that can be connected to the threaded screw (220); the inner bottom of each of the batching barrels (20) is slidably clamped with a conical discharge head (23), and the batching barrel (20) is provided with a first electric rod (24) connected to the conical discharge head (23).

3. The precise dispensing equipment for cementing fluid used in shale gas development according to claim 2, characterized in that: The embracing member (4) comprises a plurality of threaded blocks (40) slidably engaged with the interior of the lifting plate (14), a driving plate (41) rotatably engaged with the interior of the lifting plate (14), and a second electric rod (42) arranged inside the lifting plate (14) and connected to the driving plate (41); arc-shaped thrust grooves (410) are arranged on the driving plate (41) at positions corresponding to the positions of the threaded blocks (40); the threaded blocks (40) are movably engaged with the arc-shaped thrust grooves (410) at corresponding positions via a bayonet (400); and a through groove (100) for the threaded blocks (40) to slide is arranged on the supporting sleeve (10).

4. The precise dispensing equipment for cementing fluid used in shale gas development according to claim 1, characterized in that: A collecting hopper (35) is arranged inside each mixing barrel (30) and at a position corresponding to the movable baffle (33); a conduit (350) is horizontally arranged at the lower end of each collecting hopper (35); a discharge trough (3500) is arranged at the lower end of the conduit (350); a material receiving column (351) is rotatably engaged inside the conduit (350); a fan-shaped transfer groove (3510) is arranged on the material receiving column (351); a first bevel gear (353) is arranged at one end of the material receiving column (351) close to the mixing motor (31) through a connecting shaft (352); and a second bevel gear (354) meshingly connected to the first bevel gear (353) is sleeved on the main shaft (320).

5. The precise dispensing equipment for cementing fluid used in shale gas development according to claim 1, characterized in that: A horizontal rod (322) is arranged inside the flow trough (3210), and auxiliary mixing plates (323) perpendicular to the mixing plate (321) are arranged on both sides of the horizontal rod (322).

6. The precise dispensing equipment for cementing fluid used in shale gas development according to claim 5, characterized in that: A vibration rod (324) connected to the horizontal rod (322) is slidably engaged inside the mixing plate (321); a vibration spring (3240) abutting against the inner wall of the mixing plate (321) is provided at the top of the vibration rod (324); a vibration roller (3241) is rotatably engaged at the bottom; and an annular vibration rail (325) abutting against the vibration roller (3241) is provided at the bottom of the mixing cylinder (30).

7. A method for accurately dispensing cementing fluid for shale gas development, based on a device for accurately dispensing cementing fluid for shale gas development as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Using a rotating motor (22) to drive the threaded screw (220) to rotate, so that the chuck (11) drives one of the batching barrels (20) to rotate above the weighing instrument (21), and then injecting raw materials for the cementing fluid into the batching barrel (20), and using the weighing instrument (21) to weigh the weight of the raw materials in the batching barrel (20); S2, repeating step S1, using different batching barrels (20) and weighing instruments (21) to weigh various raw materials for the cementing fluid; then injecting the raw materials in each batching barrel (20) into the mixing barrel (30) through the feed holes (300) on the mixing barrel (30); S3. The mixing motor (31) is used to drive the agitator (32) to rotate, and the various raw materials in the mixing barrel (30) are heated to 55-75° C. by the electric heating jacket (34), and the agitation is continued for 25-40 minutes at a stirring speed of 1250-1550 r / min to obtain the desired cementing fluid.

8. The precise cementing fluid dispensing equipment for shale gas development according to claim 7, characterized in that: A horizontal rod (322) is disposed inside the flow trough (3210), and auxiliary mixing plates (323) are disposed on both sides of the horizontal rod (322).

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