CN118029921A - Drilling fluid solid-phase control system for module drilling machine - Google Patents

Abstract

The invention discloses a drilling fluid solid-phase control system for a modular drilling machine, which comprises: a simple wellhead; the simple wellhead is fixed on the wellhead of the modular drilling rig drill floor and is connected with the sand pump; the sand pump is connected with the first-stage purifier, the first circulating tank is connected with the second-stage purifier, and the third-stage purifier is arranged in the second circulating tank; the purifier is connected with the storage tank; the first circulating tank and the second circulating tank are respectively provided with a sand setting prevention mechanism; the controller is respectively connected with and controls the sand pump, the primary purifier, the secondary purifier and the tertiary purifier to be started. The drilling fluid discharged from the wellhead cannot directly flow into the solid control equipment due to the limited height of the drilling floor of the module drilling machine, a sand sedimentation tank is required to be arranged on the ground, and rock scraps and the like discharged during purification are required to be discharged into a sewage disposal tank arranged on the ground, so that the environment-friendly construction requirement is not met; the solid control equipment can lead to the sediment formation in the bottom of the storage tank circulation tank when purifying, and the problems of labor intensity increase, work efficiency influence, high operation cost and the like are solved by manual cleaning.

Description

Drilling fluid solid-phase control system for module drilling machine

Technical Field

The invention relates to the field of oilfield gathering and transportation, in particular to a drilling fluid solid-phase control system for a modular drilling machine.

Background

During the drilling of oil and gas fields, drilling fluid is a circulating flushing medium used in the wellbore, known as the blood of the well. In order to ensure the configuration, storage, treatment and circulation of the drilling fluid, a drilling fluid solid-phase control system is arranged between the drilling fluid pump and the wellhead. The drilling fluid solid-phase control system consists of a group of drilling fluid circulating tanks, purifying equipment and the like. For a drilling machine with high drilling floor, the drilling fluid returned from a wellhead is naturally conveyed to solid control equipment for purification through an overhead pipeline, and the purified rock scraps and the like are discharged into a sewage disposal tank behind a tank.

In the case of a modular drilling machine, the drilling fluid cannot flow directly into the solid control device in the above manner because of the limited height of the drill floor. Usually, a ground sand basin is adopted, so that drilling fluid firstly flows into the sand basin and then is pumped into the solid control equipment.

The drilling fluid circulating tanks in the solid control equipment are conical tanks with larger slopes on the bottom plates of the tanks, and the tanks of the sand remover and other equipment are tanks with baffle plates on the bottom plates. The large amount of solid particles, such as bentonite and solid weighting agent, existing in the drilling fluid gradually deposit to the bottom of the drilling fluid tank under the action of gravity to form sand setting, and the volume of the drilling fluid tank is reduced. Every time a well is drilled, the sand needs to be cleaned manually, and is discharged into a ground sewage disposal tank after being canned. Because of the requirement of environment-friendly construction, a sand setting pit on the ground and a sewage disposal tank behind a tank are required to be canceled, and the original drilling fluid solid-phase control system is required to be correspondingly reformed.

Disclosure of Invention

In view of the above, the invention provides a drilling fluid solid-phase control system for a modular drilling machine, which is used for solving the problems that drilling fluid discharged from a wellhead cannot directly flow into solid control equipment due to the limited height of a drilling floor of the modular drilling machine, a sand sedimentation tank is required to be arranged on the ground, and rock scraps and the like discharged during purification are required to be discharged into a sewage disposal tank arranged on the ground, so that the environment-friendly construction requirement is not met; the prior solid control equipment can cause sand setting on the circulating pipe and the bottom of the purifying equipment during purification, and the problems of labor intensity increase, labor time extension and the like are solved by manually cleaning.

In a first aspect, the present invention provides a drilling fluid solid phase control system for a modular drilling machine, comprising: a simple wellhead, a sand pump, a first circulating tank, a second circulating tank and a controller;

the simple wellhead is fixed on the wellhead of the modular drilling rig drill floor and is connected with the sand pump through a wellhead guide pipe;

The sand pump is connected with a first-stage purifier arranged on the first circulation tank through a conduit, the first circulation tank is connected with a second-stage purifier arranged on the second circulation tank through a communication pipe, a third-stage purifier is arranged in the second circulation tank, and the first-stage purifier, the second-stage purifier and the third-stage purifier are used for purifying solid-phase particles in drilling fluid;

the primary purifier, the secondary purifier and the tertiary purifier are respectively connected with a storage tank for storing solid-phase particles in the primary purifier and the secondary purifier;

The first circulating tank and the second circulating tank are respectively provided with a sand setting preventing mechanism for preventing drilling fluid in the first circulating tank and drilling fluid in the second circulating tank from sand setting;

the controller is respectively connected with and controls the starting or closing of the sand pump, the primary purifier, the secondary purifier and the tertiary purifier.

Preferably, the primary purifier is: a vibrating screen;

the inlet of the vibrating screen is connected with the sand pump through the guide pipe, and the outlet of the vibrating screen is connected with the corresponding reservoir tank;

The bottom of the vibrating screen is communicated with the interior of the first circulating tank;

the vibrating screen is arranged at a certain inclination angle with the horizontal plane, the inlet of the vibrating screen is positioned at one side with relatively higher position, and the outlet of the vibrating screen is positioned at one side with relatively lower position;

The vibrating screen is connected with the controller.

Preferably, the secondary purifier comprises: sand remover and sand-removing liquid-feeding pump;

An inlet of the desander is connected with the first circulating tank through the desanding liquid supply pump, and a liquid outlet of the desander is connected with the second circulating tank;

The sand outlet of the sand remover is connected with a corresponding storage tank;

The desanding device and the desanding liquid supply pump are respectively connected with the controller.

Preferably, the three-stage purifier includes: a centrifuge and a centrifugal liquid supply pump;

the inlet of the centrifugal machine is connected with the second circulating tank through the centrifugal liquid supply pump;

the sand outlet of the centrifugal machine is connected with a corresponding storage tank;

the centrifugal machine and the centrifugal liquid supply pump are respectively connected with the controller

Preferably, the sand setting prevention mechanism comprises: a first stirring mechanism and a second stirring mechanism;

The first stirring mechanisms are respectively arranged in the first circulating tank and the second circulating tank and close to the middle positions, and are used for preventing sand settling in the middle areas in the first circulating tank and the second circulating tank;

The second stirring mechanisms are arranged at the positions around the inner side walls of the first circulating tank and the second circulating tank respectively, and the second stirring mechanisms are used for preventing sand setting from occurring at the positions, close to the side walls, in the first circulating tank and the second circulating tank.

Preferably, the first stirring mechanism is: a stirrer;

The stirring blade of the stirrer comprises: helical ribbon type blades and flat plate type blades;

The stirrer is connected with the controller.

Preferably, the second stirring mechanism includes: mud gun and mud liquid supply pump;

A plurality of mud guns are equidistantly arranged on the inner side wall of the first circulating tank and the second circulating tank;

the slurry supply pumps are respectively arranged in the first circulating tank and the second circulating tank, and the slurry guns are respectively connected with the corresponding slurry supply pumps;

The slurry feed pump is connected with the controller.

Preferably, the first circulation tank and the second circulation tank are flat bottom tanks.

The invention has the following beneficial effects:

The invention provides a drilling fluid solid-phase control system for a module drilling machine, which is characterized in that a simple wellhead and a sand pump are arranged, drilling fluid in the wellhead is conveyed into first-stage purifying equipment on a first circulating tank for purification, and then enters second-stage purifying equipment and third-stage purifying equipment on a second circulating tank for purification again; each purifying device is connected with a corresponding storage tank and is used for storing waste materials generated during purification, so that a pollution discharge pool arranged on the ground is eliminated, the environment-friendly requirement is met, meanwhile, pit digging and manual cleaning of sand setting in the tank are not needed, and the labor intensity is reduced.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

FIG. 1 is a top view of a drilling fluid solids control system for a modular drilling rig according to an embodiment of the present invention;

fig. 2 is a front view of a drilling fluid solids control system for a modular drilling rig according to an embodiment of the present invention.

In the figure, 1-simple wellhead, 1.1-wellhead conduit, 2-sand pump, 2.2-conduit, 3.1-first circulation tank, 3.2-second circulation tank, 4-vibrating screen, 5-stirrer, 6-mud gun, 7-mud liquid supply pump, 8-sand removal liquid supply pump, 9-sand remover, 10-centrifugal liquid supply pump, 11-centrifuge, 12-reservoir tank, 13-drill floor.

Detailed Description

The present invention is described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. However, for the part not described in detail, the present invention is also fully understood by those skilled in the art.

Furthermore, those of ordinary skill in the art will appreciate that the drawings are provided solely for the purposes of illustrating the objects, features, and advantages of the invention and that the drawings are not necessarily drawn to scale.

Meanwhile, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".

FIG. 1 is a top view of a drilling fluid solids control system for a modular drilling rig according to an embodiment of the present invention; fig. 2 is a front view of a drilling fluid solids control system for a modular drilling rig according to an embodiment of the present invention. As shown in fig. 1 and 2, a drilling fluid solid-phase control system for a modular drilling machine includes: a simple wellhead 1, a sand pump 2, a first circulating tank 3.1, a second circulating tank 3.2 and a controller; the simple wellhead 1 is fixed on a wellhead of a modular drilling rig drill floor 13, and the simple wellhead 1 is connected with the sand pump 2 through a wellhead guide pipe 1.1; the sand pump 2 is connected with a first-stage purifier arranged on the first circulation tank 3.1 through a conduit 2.2, the first circulation tank 3.1 is connected with a second-stage purifier arranged on the second circulation tank 3.2 through a communication pipe, a third-stage purifier is arranged in the second circulation tank 3.2, and the first-stage purifier, the second-stage purifier and the third-stage purifier are used for purifying solid-phase particles in drilling fluid; the primary purifier, the secondary purifier and the tertiary purifier are respectively connected with a storage tank 12 for storing solid phase particles in the primary purifier and the secondary purifier; the first circulation tank 3.1 and the second circulation tank 3.2 are respectively provided with a sand setting preventing mechanism for preventing sand setting of drilling fluid in the first circulation tank 3.1 and the second circulation tank 3.2; the controller is respectively connected with and controls the starting or closing of the sand pump 2, the primary purifier, the secondary purifier and the tertiary purifier.

In the embodiment of the invention, when the drilling fluid is purified, the controller controls the sand pump 2 to start, and the drilling fluid in the wellhead is conveyed into a first-stage purifier arranged at the top of the first circulating tank 3.1 through the simple wellhead 1, the wellhead guide pipe 1.1 and the guide pipe 2.2; the controller controls the first-stage purifier to start, filters and purifies large particles such as rock debris in drilling fluid input into the first-stage purifier, and the purified drilling fluid downwards enters the first circulation tank 3.1. Large particulate matter such as rock debris filtered by the primary clarifier during the clarification process enters its associated reservoir tank 12.

After the drilling fluid enters the first circulating tank 3.1, the controller controls the sand setting prevention mechanism in the first circulating tank 3.1 to start, so that the sediment is prevented from being generated in the bottom of the first circulating tank 3.1.

The controller controls the second-stage purifier to start, the drilling fluid in the first circulating tank 3.1 is conveyed into the second-stage purifier to be purified, the second-stage purifier purifies and filters small-particle rock fragments and gravel existing in the drilling fluid, and the purified drilling fluid downwards enters the second circulating tank 3.2. Small particles such as cuttings, gravel, etc., which are filtered by the secondary purifier during the purification process, enter their associated reservoir tanks 12.

After the drilling fluid enters the second circulation tank 3.2, the controller controls the sand setting prevention mechanism in the second circulation tank 3.2 to start, so that the sediment is prevented from being generated in the bottom of the second circulation tank 3.2.

The controller controls the three-stage purifier to start, the drilling fluid in the second circulating tank 3.2 is conveyed into the three-stage purifier to be purified, and the three-stage purifier filters tiny particle sediment in the drilling fluid. The tertiary purifier filters out small particles such as silt during the purification process into its associated reservoir tank 12.

The drilling fluid filtered by the primary, secondary and tertiary purifiers can be reused after all purification processes are completed.

Wherein, the sand pump is a vertical lifting, large-displacement and large-lift sand pump.

In the present disclosure, the primary purifier is: a vibrating screen 4; the inlet of the vibrating screen 4 is connected with the sand pump 2 through the guide pipe 2.2, and the outlet of the vibrating screen 4 is connected with a corresponding reservoir tank 12; the bottom of the vibrating screen 4 is communicated with the inside of the first circulating tank 3.1; the vibrating screen 4 is arranged at a certain inclination angle with the horizontal plane, the inlet of the vibrating screen 4 is positioned at one side with relatively higher position, and the outlet of the vibrating screen 4 is positioned at one side with relatively lower position; the vibrating screen 4 is connected with the controller.

In the embodiment of the invention, after the sand pump 2 is started, the drilling fluid in the well is conveyed into the vibrating screen 4 through the guide pipe 2.2. When the controller controls the vibrating screen 4 to start to vibrate and drilling fluid passes through the vibrating screen 4 from top to bottom, rock scraps therein are filtered by vibrating through the vibrating screen 4, and the filtered drilling fluid passes through the vibrating screen 4 and enters the first circulating tank 3.1 downwards. Large particle impurities such as rock debris are filtered on the vibrating screen 4. Because the vibrating screen 4 is obliquely arranged, along with the vibration of the vibrating screen 4, the filtered rock fragments slide down on the vibrating screen 4 and enter a reservoir tank 12 connected with the lower side of the vibrating screen 4.

In the present disclosure, the secondary purifier includes: a desanding device 9 and a desanding liquid supply pump 8; an inlet of the desander 9 is connected with the first circulating tank 3.1 through the desanding liquid supply pump 8, and a liquid outlet of the desander 9 is connected with the second circulating tank 3.2; the sand outlet of the sand remover 9 is connected with a corresponding reservoir tank 12; the desanding device 9 and the desanding liquid supply pump 8 are respectively connected with the controller.

In the embodiment of the disclosure, the controller controls the sand removal liquid supply pump 8 to be started, and drilling fluid which enters the first circulation tank 3.1 after being filtered by the vibrating screen 4 is conveyed from the inlet of the sand remover 9 to the inside of the first circulation tank through the communicating pipe. The controller controls the sand remover 9 to start, the cyclone in the sand remover 9 rotates at a high speed, and the fluid in the drilling fluid is discharged along the overflow pipe under the action of centrifugal force and enters the second circulating tank 3.2 downwards. The cyclone tube inner wall of the cyclone is obliquely arranged, the sand outlet is arranged on the relatively lower side of the cyclone tube inner wall, and small particle grits separated from drilling fluid downwards pass through the sand outlet along the cyclone tube inner wall and enter the connected reservoir tank 12.

In the present disclosure, the three-stage purifier includes: a centrifuge 11 and a centrifugal liquid feed pump 10; the inlet of the centrifugal machine 11 is connected with the second circulating tank 3.2 through the centrifugal liquid supply pump 10; the sand outlet of the centrifugal machine 11 is connected with a corresponding storage tank 12; the centrifugal machine 11 and the centrifugal liquid supply pump 10 are respectively connected with the controller.

In the embodiment of the disclosure, the centrifuge 11 is an industrial centrifuge 11, and after the drilling fluid purified by the sand remover 9 enters the second circulation tank 3.2, the controller controls the centrifugal fluid supply pump 10 to start, and the drilling fluid in the second circulation tank 3.2 is input into the second circulation tank from the inlet of the centrifuge 11. The controller controls the centrifuge 11 to start, so that the drilling fluid is separated from tiny particles such as muddy sand and the like in the drilling fluid, and the separated muddy sand enters a storage tank 12 connected with the centrifuge 11 from a sand outlet. The purified drilling fluid is re-entered into the second circulation tank 3.2 for reuse.

In the present disclosure, the sand setting prevention mechanism includes: a first stirring mechanism and a second stirring mechanism; the first stirring mechanisms are respectively arranged in the first circulation tank 3.1 and the second circulation tank 3.2 close to the middle positions, and the first stirring mechanisms are used for preventing sand deposition in the middle areas in the first circulation tank 3.1 and the second circulation tank 3.2; the second stirring mechanisms are arranged around the inner side walls of the first circulating tank 3.1 and the second circulating tank 3.2, and are used for preventing sand setting from occurring at the positions, close to the side walls, in the first circulating tank 3.1 and the second circulating tank 3.2.

In the embodiment of the disclosure, after the drilling fluid enters the first circulation tank 3.1 and the second circulation tank, the controller controls the first stirring mechanism and the second stirring mechanism to start, so as to stir the drilling fluid in the first circulation tank 3.1 and the second circulation tank 3.2 and prevent sand setting.

In the present disclosure, the first stirring mechanism is: a stirrer 5; the stirring blade of the stirrer 5 includes: helical ribbon type blades and flat plate type blades; the stirrer 5 is connected with the controller.

In the embodiment of the present disclosure, the output shaft of the agitator 5 is vertically disposed, and a ribbon blade and a flat blade are disposed around the outside of the output shaft, wherein the flat blade is under the ribbon blade. The bottom surfaces of the flat plate type blades are contacted and attached with the inner bottom surface of the first circulating tank 3.1 or the second circulating tank 3.2. The spiral belt type blade is a spiral blade arranged around the outer peripheral surface of the output shaft; the flat plate type blade is a straight blade or a blade with a certain bending radian.

After the drilling fluid enters the first circulating tank 3.1 and the second circulating tank 3.2, the controller controls the stirrer 5 to start, and the flat plate type blades and the spiral belt type blades are driven by the output shaft to rotate along the axis of the output shaft, so that the drilling fluid in the first circulating tank 3.1 and the second circulating tank 3.2 is driven to flow in an accelerating mode, and sand setting is prevented. The flat plate type blades stir part of the fluid near the bottom of the circulating tank, and the spiral belt type blades stir the fluid at the middle upper part inside the circulating tank.

Through the combination of spiral ribbon type blade and traditional flat blade to can prevent that single spiral ribbon type blade from can't fully stir the partial fluid that is in the circulation tank bottom, and single flat blade can't fully stir the problem that is in well upper portion's fluid, can improve stirring effect by a wide margin. Wherein, the length of the ribbon blade can be selected to be longer according to the requirement.

The stirrer is vertical stirring equipment with large torque, large range, energy conservation and better stirring effect.

In the present disclosure, the second stirring mechanism includes: a mud gun 6 and a mud supply pump 7; a plurality of mud guns 6 are equidistantly arranged on the inner side walls of the first circulating tank 3.1 and the second circulating tank 3.2; the slurry liquid supply pumps 7 are respectively arranged in the first circulation tank 3.1 and the second circulation tank 3.2, and the slurry guns 6 are respectively connected with the corresponding slurry liquid supply pumps 7; the slurry feed pump 7 is connected with the controller.

In the embodiment of the disclosure, after the drilling fluid enters the first circulation tank 3.1 and the second circulation tank 3.2, the controller controls the slurry supply pump 7 to start, the drilling fluid in the circulation tank is pumped and then is input into the slurry gun 6 after being pressurized through a pipeline, and the drilling fluid is sprayed out from the outlet of the slurry gun 6 and enters the circulation tank.

The mud gun 6 is arranged on the inner side walls of the first circulating tank 3.1 and the second circulating tank 3.2 and is close to the inner edge position of the circulating tanks. After the drilling fluid is sprayed out from the mud gun 6, the flow speed of the drilling fluid in the inner edge areas of the first circulating tank 3.1 and the second circulating tank 3.2 can be increased, so that sand setting in the inner edge areas of the circulating tanks is prevented. Wherein the slurry feed pump 7 is a vertical pump; the mud guns 6 in the first circulating tank 3.1 and the second circulating tank 3.2 are uniformly arranged around the inner walls of the mud guns 6.

In the present disclosure, the first circulation tank 3.1 and the second circulation tank 3.2 are flat bottom tanks.

In the embodiment of the disclosure, the first circulation tank 3.1 and the second circulation tank 3.2 are flat bottoms, so that the mud gun 6 and the stirrer 5 can fully play roles.

In the embodiment of the disclosure, when the drilling fluid is purified, the controller controls the sand pump 2 to start, and the drilling fluid in the wellhead is conveyed into the vibrating screen 4 through the simple wellhead 1, the wellhead guide tube 1.1 and the guide tube 2.2. The controller controls the vibrating screen 4 to start to vibrate, the drilling fluid filters the large rock fragments in the drilling fluid through the vibrating screen 4, and the filtered drilling fluid enters the first circulating tank 3.1 downwards. The filtered rock debris and other large-particle impurities vibrate the vibrating screen 4 and slide down into a reservoir tank 12 connected to one side of the vibrating screen 4.

After the drilling fluid enters the first circulation tank 3.1, the controller controls the stirrer 5 in the first circulation tank 3.1 to start, the flat plate type blades and the spiral belt type blades are driven to rotate through the output shaft, meanwhile, the controller controls the slurry liquid supply pump 7 in the first circulation tank 3.1 to start, the drilling fluid in the first circulation tank 3.1 is pumped into the slurry gun 6 of the first circulation tank 3.1, and then the drilling fluid is sprayed out from the outlet of the slurry gun 6 to enter the first circulation tank 3.1. Thereby driving the drilling fluid in the first circulating tank 3.1 to accelerate the flow and preventing sand setting.

The controller controls the sand removal liquid supply pump 8 to start, and the drilling fluid in the first circulating tank 3.1 is conveyed into the sand remover 9 through the communicating pipe. The controller controls the sand remover 9 to start so as to separate small-particle rock fragments from gravel in the drilling fluid, and the separated drilling fluid enters the second circulating tank 3.2 downwards. Simultaneously, the controller controls the slurry feed pump 7 and the stirrer 5 in the second circulating tank 3.2 to start, drives the drilling fluid in the second circulating tank to accelerate flowing, and prevents sand setting.

The controller controls the centrifugal liquid feed pump 10 to start, and the drilling fluid in the second circulation tank 3.2 is input into the centrifugal machine 11. The controller controls the centrifuge 11 to start, so as to separate the drilling fluid from tiny particles such as muddy sand and the like in the centrifuge, and the separated drilling fluid reenters the second circulating tank 3.2 for reuse.

Impurities such as rock debris, muddy sand and the like separated by the vibrating screen 4, the sand remover 9 and the centrifugal machine 11 in the operation process enter a storage tank 12 correspondingly connected with the vibrating screen. When the reservoir tank 12 needs to be cleaned, it is transported directly to a discharge point and the waste filtered inside is dumped clean.

The invention discloses a drilling fluid solid-phase control system for a modular drilling machine, which aims to solve the problem that in the prior art, drilling fluid cannot be conveyed from a wellhead to purifying equipment by adopting an overhead pipeline because the height of a drilling floor 13 is limited, and uses a simple wellhead 1 and a sand pump 2 which are suitable for the modular drilling machine. The problems that the sewage disposal tank is not beneficial to environmental protection due to the back digging of the circulating tank and the manual cleaning of easy sand setting in the circulating tank are solved. The drilling fluid circulation tank is improved, the conical tank is changed into a flat bottom tank, and a partition plate in the tank is omitted.

A mud gun 6 which is reasonably arranged and a vertical pump for supplying liquid are added in the circulating tank, and drilling liquid sprayed out of the mud gun 6 is utilized to punch and prick the bottom of the circulating tank; the blades of the agitator 5 are also adjusted. Under the combined action of the mud gun 6 and the stirrer 5, sand setting cannot occur at the bottom of the drilling fluid tank, the deposition of solid phase in the tank is reduced, and the purpose of no need of manual cleaning is achieved.

The storage tank is small in size, can be detached and moved, is easy to move, replaces a traditional sewage disposal tank, is used for collecting and temporarily storing in a point-to-point mode, is transported away at a proper time, achieves the non-falling of a liquid phase and a solid phase, meets the requirements of reducing the number of land used and protecting the environment, and reduces the running and labor cost of digging pit, paving anti-seepage cloth and the like.

The above examples are merely illustrative embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that modifications, equivalent substitutions, improvements, etc. can be made by those skilled in the art without departing from the spirit of the present invention, and these are all within the scope of the present invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (8)

1. A drilling fluid solid phase control system for a modular drilling machine, comprising: a simple wellhead (1), a sand pump (2), a first circulating tank (3.1), a second circulating tank (3.2) and a controller;

The simple wellhead (1) is fixed on a wellhead of a modular drilling rig drill floor (13), and the simple wellhead (1) is connected with the sand pump (2) through a wellhead guide pipe (1.1);

The sand pump (2) is connected with a first-stage purifier arranged on the first circulation tank (3.1) through a conduit (2.2), the first circulation tank (3.1) is connected with a second-stage purifier arranged on the second circulation tank (3.2) through a communication pipe, a third-stage purifier is arranged in the second circulation tank (3.2), and the first-stage purifier, the second-stage purifier and the third-stage purifier are used for purifying solid-phase particles in drilling fluid;

the primary purifier, the secondary purifier and the tertiary purifier are respectively connected with a storage tank (12) for storing solid-phase particles in the primary purifier and the secondary purifier;

The first circulating tank (3.1) and the second circulating tank (3.2) are respectively provided with a sand setting preventing mechanism for preventing sand setting of drilling fluid in the first circulating tank (3.1) and the second circulating tank (3.2);

the controller is respectively connected with and controls the starting or closing of the sand pump (2), the primary purifier, the secondary purifier and the tertiary purifier.

2. The drilling fluid solid phase control system for a modular drilling machine of claim 1, wherein the primary purifier is: a vibrating screen (4);

an inlet of the vibrating screen (4) is connected with the sand pump (2) through the guide pipe (2.2), and an outlet of the vibrating screen (4) is connected with a corresponding reservoir tank (12);

The bottom of the vibrating screen (4) is communicated with the inside of the first circulating tank (3.1);

the vibrating screen (4) is arranged at a certain inclination angle with the horizontal plane, the inlet of the vibrating screen (4) is positioned at one side with relatively higher position, and the outlet of the vibrating screen (4) is positioned at one side with relatively lower position;

The vibrating screen (4) is connected with the controller.

3. The drilling fluid solids control system for a modular drilling machine of claim 1, wherein the secondary purifier comprises: a desanding device (9) and a desanding liquid supply pump (8);

An inlet of the desander (9) is connected with the first circulating tank (3.1) through the desanding liquid supply pump (8), and a liquid outlet of the desander (9) is connected with the second circulating tank (3.2);

The sand outlet of the sand remover (9) is connected with a corresponding storage tank (12);

the desanding device (9) and the desanding liquid supply pump (8) are respectively connected with the controller.

4. The drilling fluid solids control system for a modular drilling machine of claim 1, wherein the three stage purifier comprises: a centrifuge (11) and a centrifugal liquid supply pump (10);

the inlet of the centrifugal machine (11) is connected with the second circulating tank (3.2) through the centrifugal liquid supply pump (10);

The sand outlet of the centrifugal machine (11) is connected with a corresponding storage tank (12);

the centrifugal machine (11) and the centrifugal liquid supply pump (10) are respectively connected with the controller.

5. The drilling fluid solid phase control system for a modular drilling machine of claim 1, wherein the sand setting prevention mechanism comprises: a first stirring mechanism and a second stirring mechanism;

the first stirring mechanisms are respectively arranged in the first circulating tank (3.1) and the second circulating tank (3.2) close to the middle positions and are used for preventing sand setting in the middle areas in the first circulating tank (3.1) and the second circulating tank (3.2);

the second stirring mechanisms are arranged at the positions surrounding the inner side walls of the first circulating tank (3.1) and the second circulating tank (3.2) in a circle respectively, and are used for preventing sand deposition in the positions, close to the side walls, of the first circulating tank (3.1) and the second circulating tank (3.2).

6. The drilling fluid solid phase control system for a modular drilling machine of claim 5, wherein the first stirring mechanism is: a stirrer (5);

the stirring blade of the stirrer (5) comprises: helical ribbon type blades and flat plate type blades;

The stirrer (5) is connected with the controller.

7. The drilling fluid solids control system for a modular drilling machine of claim 5, wherein the second agitation mechanism comprises: a mud gun (6) and a mud supply pump (7);

a plurality of mud guns (6) are equidistantly arranged on the inner side walls of the first circulating tank (3.1) and the second circulating tank (3.2);

the first circulating tank (3.1) and the second circulating tank (3.2) are internally provided with the slurry liquid supply pump (7) respectively, and the slurry guns (6) are connected with the corresponding slurry liquid supply pumps (7) respectively;

the slurry feed pump (7) is connected with the controller.

8. The drilling fluid solid phase control system for a modular drilling machine according to any one of claims 1 to 7, wherein:

the first circulating tank (3.1) and the second circulating tank (3.2) are flat bottom tanks.