CN110107235B - Drilling fluid filter cake pressing and cleaning efficiency integrated evaluation device and method - Google Patents
Drilling fluid filter cake pressing and cleaning efficiency integrated evaluation device and method Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 144
- 238000005553 drilling Methods 0.000 title claims abstract description 117
- 239000012065 filter cake Substances 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004140 cleaning Methods 0.000 title claims abstract description 21
- 238000011156 evaluation Methods 0.000 title claims abstract description 15
- 238000003825 pressing Methods 0.000 title claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 238000006073 displacement reaction Methods 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 238000010008 shearing Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 13
- 239000000706 filtrate Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 abstract description 28
- 230000015572 biosynthetic process Effects 0.000 abstract description 8
- 238000011160 research Methods 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 3
- 239000011435 rock Substances 0.000 description 15
- 230000001788 irregular Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 238000009795 derivation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 239000011148 porous material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/005—Testing the nature of borehole walls or the formation by using drilling mud or cutting data
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Abstract
The invention relates to an integrated evaluation device and method for the pressing and cleaning efficiency of a drilling fluid filter cake, wherein the device consists of a rotor 1, a variable speed motor 2, a sealing cover 11, an artificial well wall 7 and a screw rod 9, the rotor 1 is fixed between an upper sealing cover and a lower sealing cover through a bearing, the rotor and the variable speed motor 2 are coaxially fixed, the artificial well wall 7 is arranged outside the rotor, the artificial well wall is also fixed between the upper sealing cover and the lower sealing cover through the screw rod 9, the upper sealing cover is provided with a liquid inlet and a pressurizing opening, and the lower sealing cover is provided with a liquid outlet and a. The method comprises the following steps: pouring the drilling fluid into an annular space between the rotor and the artificial well wall; opening a variable speed motor to simulate the underground circulation displacement during drilling; measuring the thickness of a filter cake of the drilling fluid; then filling the annular space between the rotor and the artificial well wall with pad fluid; opening a variable speed motor to simulate displacement of pad fluid in well cementation; and calculating the filter cake cleaning efficiency and the shear strength. The method is simple and convenient to operate, and facilitates the in-depth research of the influence factors and mechanisms of the formation of the filter cake of the drilling fluid and the flushing efficiency.
Description
Technical Field
The invention relates to an integrated simulation evaluation device and method capable of pressing and flushing a filter cake of drilling fluid on a well wall in a dynamic and pressurized environment, belonging to the field of oil and gas field exploration and development.
Background
During the drilling process of oil and gas wells, the drilling fluid can form a drilling fluid filter cake with certain strength and thickness on the permeable well wall under the action of pressure difference.
Compared with drilling fluid, the drilling fluid filter cake has higher structural strength, most boreholes are not in a standard round shape, and the surface of the borehole wall is not flat and smooth, so that the drilling fluid filter cake formed by the borehole wall under the action of long-time pressure difference is more difficult to wash clean and is more easy to become an oil-gas-water channeling channel, and the risk of well cementation failure is increased.
In order to research the influence, rule and mechanism of relevant factors on the flushing efficiency of the drilling fluid filter cake, a device and a method capable of pressing and/or flushing the drilling fluid filter cake need to be developed. After years of research, researchers at home and abroad propose different drilling fluid filter cake pressing methods and flushing efficiency evaluation methods, but due to simple treatment on borehole conditions, drilling fluid filter cake formation and a flushed process, each link is seriously inconsistent with the actual underground condition, so that the evaluation result deviates from the actual condition.
The commonly used drilling fluid filter cake forming modes can be divided into the following modes: (1) the outer cylinder of a common six-speed rotary viscometer is soaked in the drilling fluid for a period of time, and a layer of drilling fluid is adhered to the surface of the outer cylinder through the adhesion effect of the drilling fluid and is used for simulating the drilling fluid to form a filter cake on a well wall. (2) The method comprises the steps of putting a rock core or an artificial rock core into a high-pressure container, such as a high-temperature high-pressure dehydration instrument, filling and pressurizing drilling fluid, and compressing fluid in inner pores of the rock core to enable the drilling fluid to be percolated in the rock core and form a layer of filter cake on the surface, wherein the forming mode of the filter cake is close to that of the underground situation, but when the rock core with the filter cake is disassembled and taken through pressure relief, the compressed fluid and filtrate in the rock core begin to expand and are discharged back from the interior of the rock core, so that the bonding strength between the filter cake and the rock core is greatly reduced, and the result of subsequent flushing efficiency. (3) The pressure difference is generated at the two ends or inside and outside the rock core, so that the drilling fluid forms a filter cake on the end face or the outer (inner) cylindrical surface of the rock core in a regular shape, the forming mode of the filter cake is close to the mode of forming the filter cake underground, but the simulated well wall on the rock core is the end face or the cylindrical surface of the regular cylinder, so that the formed filter cake is a regular round cake or a round ring, which is not consistent with the condition that most actual well holes are not round or even seriously elliptical, and the formed filter cake is a round ring with a complex shape and space.
The commonly used drilling fluid filter cake washing modes can be divided into the following modes: (1) the rock core that will take the drilling fluid filter cake is arranged in the flush fluid, according to the rotatory rock core of certain speed again, cause the relative motion of drilling fluid filter cake and flush fluid, the simulation flush fluid washes drilling fluid filter cake process in the pit, it is not enough to lie in the drilling fluid filter cake in the flush fluid by the even condition of washing out with the well hole is mostly not round, the condition that the drilling fluid filter cake is uneven to wash out on the wall of a well, furthermore, drive on its surface at the rock core under the high-speed rotatory condition of drilling fluid filter cake, it is difficult to distinguish whether the drilling fluid filter cake is washed out or is thrown away by. (2) The flushing fluid is filled in the rock core with the drilling fluid filter cake on the inner wall, then the stirring or circulating of the flushing fluid is carried out, the drilling fluid filter cake and the flushing fluid generate relative motion, the influence of centrifugal force caused by high-speed rotation of the filter cake on an evaluation result can be avoided, and the problem that the filter cake is uniformly flushed still exists.
The invention provides a device and a method for simulating and quantitatively evaluating flushing efficiency of a cementing pad fluid (CN 104675345A). The device and the method have the advantages that a core with a filter cake is rotated in a flushing fluid to produce relative motion between the flushing fluid and the filter cake, the operation is simple, but the centrifugal force influences the precision of an evaluation result, and the higher the rotating speed, the larger the influence.
The invention discloses a quantitative simulation evaluation device for well cementation flushing fluid (CN203515574U), which is used for simulating the formation and flushing process of a drilling fluid filter cake by establishing an artificial shaft and is more in line with the underground condition, but the device is higher in cost, complex in design and complex in operation, and especially the regular annular drilling fluid filter cake is not in line with the actual underground condition.
The invention discloses a device and a method for evaluating the well cementation flushing efficiency (CN104863533A), which design a simulation device according to the Reynolds number similarity principle, are simple and convenient to operate and integrate filter cake formation and flushing; the invention discloses an experimental device and an experimental method for simulating a cementing pad fluid flushing mud cake (CN106285526A), which can simulate the flushing process of a flushing fluid on a filter cake under an eccentric condition, but all have the problem that the regular circular filter cake does not conform to the underground reality.
Disclosure of Invention
The invention aims to provide an integrated evaluation device for the pressing and cleaning efficiency of a drilling fluid filter cake.
The invention also aims to provide a method for evaluating the pressing and cleaning efficiency of the drilling fluid filter cake by using the device, which has reliable principle and simple and convenient operation, and can conveniently and deeply research the influence factors and mechanisms of the formation and flushing efficiency of the drilling fluid filter cake under irregular well conditions through the formation condition of the drilling fluid filter cake under the conditions of irregular well and the cleaning efficiency under different conditions.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
The invention forms a filter cake on the annular well wall by pressurizing under a dynamic environment, simulates the well wall filter cake to form a real environment, then replaces the real environment with the pad fluid, converts the on-site well cementation discharge capacity into the rotor rotating speed by a formula, simulates the contact time of the pad fluid, and calculates the pad fluid flushing efficiency by utilizing the thickness loss of the flushed filter cake. According to the invention, the original annular artificial well wall is replaced by the irregular artificial well wall, so that the formation condition of the drilling fluid filter cake under the irregular well hole condition and the cleaning efficiency under different conditions are researched, and the shearing strength of the drilling fluid filter cake under the action of the pad fluid is analyzed, so that the filter cake structural performance can be further researched.
The utility model provides a drilling fluid filter cake suppression and cleaning efficiency integration evaluation device, the device is located the support, comprises rotor, variable speed motor, bearing, sealed lid, the artificial wall of a well, screw rod, the rotor is fixed in between upper and lower sealed lid through the bearing, and the rotor is coaxial fixed with variable speed motor, and the outside of rotor is the artificial wall of a well, and the artificial wall of a well is fixed in between upper and lower sealed lid equally through the screw rod, and upper seal lid is equipped with inlet, pressure port, and the inlet, pressure port all are linked together with the annular space between rotor and the artificial wall of a well, and lower seal lid is equipped with tap hole, filtrating mouth, and the annular space between tap hole and the rotor and the artificial wall of a well is linked together, and the annular space between filtrating mouth and the artificial.
The artificial well wall is provided with a supporting wall, and the artificial well wall is tightly attached to the supporting wall.
And a sealing ring is arranged between the artificial well wall and the sealing cover.
The drilling fluid enters a space between the rotor and the artificial well wall through the liquid inlet, the speed-changing motor controls the rotating speed of the rotor to simulate the circulating discharge capacity of the drilling fluid, the rotation of the rotor drives the drilling fluid to move to form a dynamic environment, the drilling fluid is pressurized by the intermediate container connected with the pressurizing port, and the drilling fluid is percolated towards the well wall under the action of pressure difference to form a filter cake on the well wall, so that the thickness of the filter cake can be measured.
And (3) emptying the drilling fluid through a liquid outlet, then filling the pad fluid through a liquid inlet, setting the rotating speed of the rotor, simulating displacement, measuring the thickness of the filter cake after a period of time, calculating the cleaning efficiency, and meanwhile calculating the shearing strength of the filter cake under the pad fluid.
The method for evaluating the pressing and cleaning efficiency of the drilling fluid filter cake by using the device sequentially comprises the following steps:
(1) heating the drilling fluid to the temperature of the bottom of the well, pouring the heated drilling fluid into an annular space between the rotor and the artificial well wall through the liquid inlet, and closing the liquid inlet after the annular space is filled with the drilling fluid;
(2) pressurizing an annular space between the rotor and the artificial well wall to bottom pressure through a pressurizing port, opening a variable-speed motor, simulating underground circulation displacement during drilling, and determining the rotating speed Nm of the variable-speed motor according to the following formula:
in the formula: qmThe circulation displacement of the drilling fluid under the well during drilling is L/s; dmIs the borehole radius, m, during drilling; dmIs the drill pipe radius, m; kmIs the drilling fluid consistency coefficient, mPasn；nmThe index is a drilling fluid fluidity index and has no unit; tau ismThe drilling fluid is hydraulically driven with a shearing force of Pa; r1Is the rotor radius, m; r2The radius of the inner wall of the artificial well wall is m;
(3) after 30min, closing the variable speed motor, releasing pressure, discharging the drilling fluid through a liquid discharge port, measuring the thickness H of the original filter cake of the drilling fluid formed in the artificial well wall by adopting a needle penetration method, measuring at multiple positions, and taking the average value of the thicknesses;
(4) slowly filling the pre-posed liquid into an annular space between the rotor and the artificial well wall through the liquid inlet, and closing the liquid inlet after the pre-posed liquid is filled;
(5) starting a variable-speed motor, simulating the displacement of the pad fluid in the well cementation process, and determining the rotating speed N of the variable-speed motor according to the following formulas：
In the formula: qsThe displacement is the displacement of the pad fluid, L/s; dsRadius of the well bore in cementing, m; dsIs the casing radius, m; ksIs the pad consistency factor, mPasn；nsIs a pre-fluidity index, without unit; tau issThe front hydraulic shearing force is Pa; r1Is the rotor radius, m; r2The radius of the inner wall of the artificial well wall is m; r iss＝R2-H，m；
(6) Measuring the thickness of the filter cake every 5min until the thickness h of the filter cake is not changed;
(7) the cake cleaning efficiency was calculated by the following formula:
(8) the shear strength of the washed filter cake was calculated by the following formula:
in the formula: ksIs the pad consistency factor, mPasn；nsIs a pre-fluidity index, without unit; tau issThe front hydraulic shearing force is Pa; r1Is the rotor radius, m; r2The radius of the inner wall of the artificial well wall is m; r iss＝R2-H，m。
The drilling fluid is field sampling drilling fluid or laboratory prepared drilling fluid.
The pad fluid is a field sampling pad fluid or a laboratory preparation pad fluid.
According to the invention, the original annular artificial well wall is replaced by the irregular artificial well wall, so that the formation condition of a drilling fluid filter cake under the irregular well hole condition and the cleaning efficiency under different conditions are researched.
The shear strength of the drilling fluid filter cake under the action of the pad fluid is analyzed, so that the filter cake structural performance can be further researched.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention can form filter cakes on artificial regular or irregular annular well walls with different permeability under the conditions of dynamic heating and pressurizing, and better accords with the underground practice;
(2) the shearing speed of a filter cake during the circulation of the drilling fluid is adjusted by controlling the rotating speed of the motor, and the filter cake is pressed according to the circulation discharge capacity and the shearing rate of the drilling fluid during drilling and the underground pressure difference by utilizing the wall surface shearing force equality principle, so that the method is more in line with the underground reality;
(3) the shearing speed of the filter cake flushed by the flushing fluid is adjusted by controlling the rotating speed of the motor, and the filter cake is flushed according to the displacement, the shearing speed and the flushing time during well cementation by utilizing the wall surface shearing force equality principle, so that the underground reality is better met;
(4) the invention can continuously monitor the change of the thickness of the filter cake, and calculate and represent the flushing efficiency of the flushing fluid through the loss of the thickness of the filter cake, thus being simpler and more reliable;
(5) according to the invention, the corresponding shear strength can be calculated according to the shear rate of the flushing fluid when the filter cake of the drilling fluid at different positions is sheared and damaged, and a theoretical basis is provided for researching the strength of the layered structure of the filter cake of the drilling fluid and the like.
Drawings
FIG. 1 is a schematic structural diagram of an integrated evaluation device for drilling fluid filter cake pressing and pad fluid cleaning efficiency.
In the figure: 1-a rotor; 2-a variable speed motor; 3-a bearing; 4-liquid inlet; 5-a liquid discharging port; 6-filtrate port; 7-artificial well wall; 8-a support wall; 9-screw rod; 10-a sealing ring; 11-a sealing cover; 12-a scaffold; 13-pressure port.
Detailed Description
The invention is further illustrated below with reference to the figures and examples in order to facilitate the understanding of the invention by a person skilled in the art. It is to be understood that the invention is not limited in scope to the specific embodiments, but is intended to cover various modifications within the spirit and scope of the invention as defined and defined by the appended claims, as would be apparent to one of ordinary skill in the art.
See fig. 1.
The utility model provides a drilling fluid filter cake suppression and cleaning efficiency integration evaluation device, the device is located support 12, comprises rotor 1, variable speed motor 2, bearing 3, sealed lid 11, artificial well wall 7, screw rod 9, rotor 1 is fixed in between the upper and lower sealed lid through bearing 3, and the rotor is coaxial fixed with variable speed motor 2, and the outside of rotor is artificial well wall 7, and the artificial well wall is fixed in between the upper and lower sealed lid equally through screw rod 9, and the upper sealed lid is equipped with inlet 4, pressurized port 13, and inlet, pressurized port all are linked together with the annular space between rotor and the artificial well wall, and the lower sealed lid is equipped with drain 5, filtrate mouth 6, and the drain is linked together with the annular space between rotor and the artificial well wall, and the filtrate mouth is linked together with the annular space between the artificial well wall and the screw rod.
The artificial well wall 7 is provided with a supporting wall 8, and the artificial well wall is tightly attached to the supporting wall.
And a sealing ring 10 is arranged between the artificial well wall 7 and the sealing cover.
The method for evaluating the pressing and cleaning efficiency of the drilling fluid filter cake by using the device sequentially comprises the following steps:
(1) heating the drilling fluid to 90 ℃, pouring the heated drilling fluid into an annular space between the rotor and the artificial well wall through a liquid inlet, and closing the liquid inlet after the annular space is filled with the drilling fluid;
(2) pressurizing the device to 3.5MPa through a pressurizing port, opening a variable-speed motor, simulating the underground circulation displacement during drilling, and determining the rotating speed of the variable-speed motor by using a formula (1);
(3) after 30min, closing the variable-speed motor, releasing pressure, discharging the drilling fluid through a liquid discharge port, measuring the thickness H of a drilling fluid filter cake formed in the artificial well wall by adopting a needle penetration method, measuring at multiple positions, and taking the average value of the thicknesses;
(4) slowly filling the pre-posed liquid into an annular space between the rotor and the artificial well wall through the liquid inlet, and closing the liquid inlet after the pre-posed liquid is filled;
(5) opening a variable-speed motor, simulating the displacement of the pad fluid in the well cementation process, and determining the rotating speed of the variable-speed motor by using a formula (2);
(6) measuring the thickness of the filter cake every 5min until the thickness h of the filter cake is not changed;
(7) calculating the filter cake cleaning efficiency eta by a formula (3);
(8) the shear strength τ of the filter cake to be cleaned is calculated by equation (4).
The derivation of equation (1) is as follows:
during drilling, the wall shear rate of the drilling fluid in the annular flow is calculated by the following formula (huxing, study on the effect of mud cake performance on flushing effect, master paper of oil university in southwest, 2017, pages 13-15):
in the formula: rm1The wall shear rate of the drilling fluid during drilling is determined; vmThe annular space return speed is m/s during drilling; dmIs the borehole radius, m, during drilling; dmIs the drill pipe radius, m; kmIs the drilling fluid consistency coefficient, mPasn；nmThe index is a drilling fluid fluidity index and has no unit; tau ismThe drilling fluid is hydraulically driven with a shearing force of Pa; r1Is the rotor radius, m; r2The radius of the inner wall of the artificial well wall is m;
drilling fluid rheological equation:
in the formula: tau is1The drilling fluid wall shear force is Pa.
Bottom hole flow and annular return velocity relation:
in the formula: qmThe circulation displacement of the drilling fluid during drilling is L/s.
The annular flow velocity distribution of the device was calculated by the following formula (Chen Xiao Yu, high fluid mechanics, Beijing: Petroleum industries Press, 2016, pp. 250-:
in the formula: vmmIs the flow velocity at a certain point of the device, m/s; r ismThe distance m from a certain point of the annular space between the rotor of the device and the well wall to the circle center; w is amTo simulate the angular speed of the device during drilling, r/s.
Derivation of the above equation yields:
in the formula: rm2The wall shear rate of the drilling fluid in the device is 1/s.
Relationship of rotational speed to angular velocity:
because the drilling fluid used by the device is selected as the real drilling fluid in the circulation process, the wall shear force is equal, and the wall shear rate is equal by conversion:
Гm1＝Гm2 (11)
the simultaneous equations (5), (7), (9) and (10) can obtain the relationship between the rotation speed of the device and the circulation displacement during drilling as follows:
the derivation process of equation (2) is as follows:
during cementing, the wall shear rate of the pad fluid in the annular flow is calculated by the following formula (huxing, study on the impact of mud cake performance on flushing effect, master paper of oil university, southwest, 2017, pages 13-15):
in the formula: rs1The shear rate of the pad fluid wall surface during well cementation; vsThe front liquid circulating speed is m/s; dsRadius of the well bore in cementing, m; dsIs the casing radius, m; ksIs the pad consistency factor, mPasn；nsIs a pre-fluidity index, without unit; tau issThe front hydraulic shearing force is Pa; r1Is the rotor radius, m; r2The radius of the inner wall of the artificial well wall is m.
Pre-liquid flow transformation process:
in the formula: tau is2The shear force of the front liquid wall surface is Pa.
Bottom hole flow and annular return velocity relation:
in the formula: qsThe displacement is replaced by pad fluid in the well cementation process, and the displacement is L/s.
The annular flow velocity distribution of the device was calculated by the following formula (Chen Xiao Yu, high fluid mechanics, Beijing: Petroleum industries Press, 2016, pp. 250-:
in the formula: vssThe flow velocity at a certain point in the annulus, m/s; r iss＝R2-H，m；wsThe device angular velocity is r/s when simulating well cementation.
Derivation of the above equation yields:
in the formula: rs2The wall shear rate of the pad in the apparatus was 1/s.
Relationship of rotational speed to angular velocity:
because the pad fluid used by the device is the real pad fluid in the well cementation displacement process, the wall shear force is equal and can be converted into the wall shear rate which is equal:
Гs1＝Гs2 (19)
the simultaneous equations (13), (15), (17), (18) and (19) can obtain the relationship between the rotation speed of the device and the displacement of the pad fluid during cementing as follows:
the derivation of equation (4) is as follows:
the filter cake shear strength can be obtained by the simultaneous formulas (14), (17) and (18):
Claims (1)
1. an integrated evaluation method for pressing and cleaning efficiency of a drilling fluid filter cake is completed by means of an evaluation device, the device is positioned on a support (12) and consists of a rotor (1), a variable speed motor (2), a bearing (3), a sealing cover (11), an artificial well wall (7) and a screw (9), the rotor (1) is fixed between an upper sealing cover and a lower sealing cover through the bearing (3), the rotor is coaxially fixed with the variable speed motor (2), the artificial well wall (7) is arranged outside the rotor, the artificial well wall is also fixed between the upper sealing cover and the lower sealing cover through the screw (9), the upper sealing cover is provided with a liquid inlet (4) and a pressurizing opening (13), the liquid inlet and the pressurizing opening are both communicated with an annular space between the rotor and the artificial well wall, the lower sealing cover is provided with a liquid discharge opening (5) and a filtrate opening (6), and the liquid discharge opening, the filtrate port is communicated with an annular space between the artificial well wall and the screw, and the method sequentially comprises the following steps:
(1) heating the drilling fluid to the temperature of the bottom of the well, pouring the heated drilling fluid into an annular space between the rotor and the artificial well wall through the liquid inlet, and closing the liquid inlet after the annular space is filled with the drilling fluid;
(2) pressurizing the annular space between the rotor and the artificial well wall to the bottom pressure through the pressurizing port, opening the variable-speed motor, simulating the underground circulation displacement during drilling, and determining the rotating speed N of the variable-speed motor according to the following formulam：
In the formula: n is a radical ofmThe rotating speed of a variable speed motor is the rotating speed per minute when the filter cake of the drilling fluid is pressed; qmThe circulation displacement of the drilling fluid under the well during drilling is L/s; dmIs the borehole radius, m, during drilling; dmIs the drill pipe radius, m; kmIs the drilling fluid consistency coefficient, mPasnN is a fluidity index, and has no unit; n ismThe index is a drilling fluid fluidity index and has no unit; tau ismThe drilling fluid is hydraulically driven with a shearing force of Pa; r1Is the rotor radius, m; r2The radius of the inner wall of the artificial well wall is m;
(3) after 30min, closing the variable speed motor, releasing pressure, discharging the drilling fluid through a liquid discharge port, measuring the thickness H of the original filter cake of the drilling fluid formed in the artificial well wall by adopting a needle penetration method, measuring at multiple positions, and taking the average value of the thicknesses;
(4) filling a pre-posed liquid into an annular space between the rotor and the artificial well wall through a liquid inlet, and closing the liquid inlet after the pre-posed liquid is filled;
(5) starting a variable-speed motor, simulating the displacement of the pad fluid in the well cementation process, and determining the rotating speed N of the variable-speed motor according to the following formulas：
In the formula: n is a radical ofsRotating speed of a variable speed motor at a speed of rpm when cleaning a filter cake of the drilling fluid; qsThe displacement is the displacement of the pad fluid, L/s; dsRadius of the well bore in cementing, m; dsIs the casing radius, m; ksIs the pad consistency factor, mPasnN is a fluidity index, and has no unit; n issIs a pre-fluidity index, without unit; tau issThe front hydraulic shearing force is Pa; r1Is the rotor radius, m; r2The radius of the inner wall of the artificial well wall is m; r iss＝R2-H，m；
(6) Measuring the thickness of the filter cake every 5min until the thickness h of the filter cake is not changed;
(7) the cake cleaning efficiency was calculated by the following formula:
(8) the shear strength of the washed filter cake was calculated by the following formula:
in the formula: tau is the shearing strength of the drilling fluid filter cake after cleaning, Pa; ksIs the pad consistency factor, mPasnN is a fluidity index, and has no unit; n issFor prepositioning the liquid streamNumber, no unit; tau issThe front hydraulic shearing force is Pa; r1Is the rotor radius, m; r2The radius of the inner wall of the artificial well wall is m; r iss＝R2-H，m。
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