A method of mud preparation for directional drilling

Abstract

The application provides a mud preparation method for directional drilling, and belongs to the technical field of foundation pit protection. The mud preparation method for directional drilling comprises the following steps: firstly, installing a mud mixing tank; preparing mud in the mud mixing tank according to a standard concentration; performing directional drilling operation; when the mud concentration reaches a predetermined value, starting a filtering device in the mud mixing tank to filter waste in the mud. The application has the beneficial effects that: the mud mixing tank is directly installed in the foundation pit at the drilling inlet or outlet, which can effectively prevent water in the mud from leaking, maintain the specific gravity of the mud, thereby ensuring that the operation effect of the mud is in a good state, and the water in the mud does not leak, which can also maintain the strength of the side wall of the foundation pit, avoid the foundation pit from being soft due to absorbing a large amount of water, and cause the trouble that the backfilling operation is difficult to perform in the later period. Directly using the mud mixing tank can reduce the construction period and improve the operation efficiency as a whole, and better maintain the clean and tidy operation environment.

Description

Technical Field

[0001] The invention belongs to the technical field of mud configuration equipment, and in particular relates to a mud configuration method for directional drilling. Background Art

[0002] Directional drilling is a pipeline construction process in the engineering industry, generally used in the construction of oil, natural gas and some municipal pipelines. Large directional drilling rigs are used to perform positioning drilling, hole expansion, hole cleaning, pipeline pullback and other processes before pipeline construction. Mud is needed during the directional drilling construction process. Mud is mainly used for drilling pilot holes, hole expansion and pullback. Its main components are clay, water and mud additives. It has five main functions: carrying chips, protecting the wall, lubricating, cooling, and balancing pressure. The correct mud ratio is also a key link in the project. The mud ratio should be checked before the directional drilling, and the specific gravity of the configured mud should be measured with a hydrometer. The standard value range is 1.15g / cm 3 -1.2g / cm 3 If the specific gravity of the mud is too large, the concentration of the mud will increase, and the viscosity will also increase, which will make the use of the mud less effective.

[0003] In the actual operation process, when configuring the mud, a slurry pool is usually excavated at the entry and exit points of the drill hole, and the mud is mixed in the slurry pool. During the drilling process, the mud carrying broken soil falls directly into the slurry pool. As the drilling depth and length of the directional drill increase, the soil produced by the drilling will fuse with the mud in the slurry pool, causing the concentration of the mud to increase with the extension of the operation time, and the operation effect of the mud gradually decreases. To solve this problem, the existing operation method is to use a mud recovery system to extract the mud, filter out the solutes therein, and dilute the mud.

[0004] However, when the above-mentioned mud configuration method is implemented, the slurry pools at the inlet and outlet of the drill hole are prone to precipitation of solutes as the operation time prolongs, resulting in a decrease in the effective content of the mud, affecting the operation effect of the mud. In addition, during the later treatment of the slurry pool, the water in the mud easily penetrates into the ground, causing the water content of the mud to be lost rapidly, and the soil around the slurry pool becomes soft due to absorbing a large amount of water, making the treatment of the slurry pool very troublesome and affecting the construction period. Summary of the Invention

[0005] The purpose of the present invention is to provide a directional drilling mud preparation method, which aims to solve the problems that components in the mud are easy to precipitate and water in the mud is easy to penetrate into the ground and lose quickly, resulting in increased mud concentration and loose soil around the slurry pool, which is not conducive to subsequent construction.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for preparing directional drilling mud, comprising the following steps:

[0007] Step 1: First install the mixing tank;

[0008] Step 2: Prepare the slurry in the mixing tank according to the standard concentration and keep the stirring device in the mixing tank always turned on;

[0009] Step 3: Directional drilling is carried out, during which the return mud is automatically collected into the mixing tank;

[0010] Step 4: When the mud concentration reaches a predetermined value, the filtering device in the mixing tank is started to filter the waste in the mud, and the filtrate is returned to the mud to dilute the mud.

[0011] In order to make the directional drilling mud preparation method more convenient to install the mixing tank, as a preferred embodiment of the present invention, in step 1, the mixing tank installation method is as follows:

[0012] Step 1: Excavate the foundation pit at the drilling entrance and level the bottom of the foundation pit;

[0013] Step 2: Hoist the mixing tank into the foundation pit and backfill the gap between the mixing tank and the foundation pit with soil to increase the stability of the mixing tank;

[0014] Step 3: Nail the guide tube in the mixing tank into the side wall of the foundation pit and fix the guide tube on the side wall of the mixing tank.

[0015] In order to make the directional drilling mud preparation method more convenient to prepare the mud, as a preferred embodiment of the present invention, in step 2, the mud preparation method is as follows:

[0016] Clay and mud additives are prepared in proportion and poured into the stirring tank in the slurry mixing tank. Water is gradually added thereto, and then the stirring device is started to mix the clay and mud additives with water evenly to form mud.

[0017] In order to make the directional drilling mud preparation method more convenient to dilute the mud, as a preferred embodiment of the present invention, in step 4, the filtering method of the filtering device is as follows:

[0018] When filtering the mud, the filter press is started first, the filter press plates are overlapped and pressed together, and then the mud pump is operated to suck the mud in the mixing tank into the filter press. The filter plates on the filter press intercept the waste impurities in the mud, and the slurry in the mud is injected into the mixing tank again for recycling; the operation is repeated in this cycle.

[0019] Another object of the present invention is to provide a mixing tank, which includes a stirring tank, a filtering tank and a power chamber. A guide tube is movably connected to the side wall of the stirring tank near the drilling port, and the guide tube can penetrate the side wall of the stirring tank and be inserted into the soil. A stirring device is provided in the stirring tank, a filtering device for filtering waste materials in the mud is provided in the filtering tank, and a driving component for providing power to the stirring device and the filtering component is provided in the power chamber.

[0020] In order to facilitate the installation of the guide pipe in the mixing tank, as a preferred embodiment of the present invention, a socket is opened on the side wall of the mixing tank, and the guide pipe can pass through the socket, and the guide pipe is connected to the side wall of the mixing tank by multiple bolts.

[0021] In order to enable the mixing tank to prevent the slurry in the stirring tank from settling, as a preferred embodiment of the present invention, the stirring device is a stirring frame rotatably installed at the bottom of the stirring tank.

[0022] In order to enable the mixing tank to inject the mud in the stirring tank into the filtering device, as a preferred embodiment of the present invention, a mud pump for sucking mud is provided in the power chamber, and the outlet of the mud pump is connected to the filtering device.

[0023] In order to enable the mixing tank to filter the waste material in the mud, as a preferred embodiment of the present invention, the filtering device is a filter press, which includes a beam, a thrust plate, a plurality of filter plates and a compression plate and a compression mechanism. The filtrate outlet of the filter press is connected to the stirring tank, the thrust plate is fixedly connected to the side wall of the stirring tank, the beam is fixedly arranged in the filter tank, and the filter plates and the compression plates are slidably connected to the beam.

[0024] Specifically, the filter press plate includes a frame and two filter plates installed in the frame, the frame is slidably connected to the beam, the outer side of the filter plate is a raw material cavity, and the space between the two filter plates is a return water cavity.

[0025] Preferably, the mesh size of the filter plate is smaller than that of sand and larger than that of clay, and the thickness of the raw material cavity formed by the filter plates on two adjacent filter press plates is less than 0.5 cm.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Installing a slurry mixing tank directly in the foundation pit at the drilling entrance or exit can effectively prevent water leakage in the mud and maintain the specific gravity of the mud, thereby ensuring that the mud operation effect is in good condition. In addition, without water leakage in the mud, the strength of the side walls of the foundation pit can be maintained, avoiding the foundation pit becoming soft due to absorbing a large amount of water, which makes the backfilling operation difficult in the later stage. Directly using a slurry mixing tank can shorten the construction period and improve the operation efficiency as a whole, while better maintaining a clean and tidy working environment.

[0028] 2. The stirring device in the mixing tank is always in operation during the directional drilling process, which can effectively prevent the mud in the mixing tank from settling and keep the mud in a uniformly mixed state, thereby further maintaining the mud operation effect. The whole process is in the process of preparing the mud and maintaining the shape and specific gravity of the mud;

[0029] 3. Cooperate with the filtering device to retain the effective components in the mud to the maximum extent, reduce the loss of effective components during the mud operation, ensure the economic benefits of the mud operation, and at the same time maintain the specific gravity and viscosity of the mud, and further maintain the mud operation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 This is an axial schematic diagram of a mixing tank in a specific embodiment of the present invention;

[0032] Figure 2 A schematic top view of a mixing tank in a specific embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of a fully sectional axial side view of a mixing tank in a specific embodiment of the present invention;

[0034] Figure 4 This is an isometric schematic diagram of a mixing tank in a specific embodiment of the present invention;

[0035] Figure 5 It is an enlarged view of point A in the isometric schematic diagram of the mixing tank in a specific embodiment of the present invention;

[0036] Figure 6 This is an enlarged view of point B in the full-section axial side schematic diagram of the slurry mixing tank in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] See also Figure 1-6 The present invention provides the following technical solution: a method for preparing directional drilling mud, comprising the following steps:

[0039] Step 1: First install the mixing tank 1;

[0040] Step 2: Prepare slurry in the mixing tank 1 according to the standard concentration, and keep the stirring device 6 in the mixing tank 1 always in the open state;

[0041] Step 3: Perform directional drilling operations, during which the return mud is automatically collected into the mixing tank 1;

[0042] Step 4: When the mud concentration reaches a predetermined value, the filtering device 7 in the mixing tank 1 is started to filter the waste in the mud, and the filtrate is returned to the mud to dilute the mud.

[0043] When installing the mixing tank 1, the present invention first excavates a foundation pit at the drilling entrance and levels the bottom of the foundation pit. Then, the mixing tank 1 is hoisted into the foundation pit, and the gap between the mixing tank 1 and the foundation pit is backfilled with soil to increase the stability of the mixing tank 1. Finally, the guide pipe 5 in the Hunjiang pool is nailed into the side wall of the foundation pit, and the guide pipe 5 is fixed to the side wall of the mixing tank 2.

[0044] When preparing the mud, the present invention configures clay and mud additives in proportion and pours them into the stirring tank 2 in the mixing tank 1, gradually adds water thereto, and then starts the stirring device 6 to mix the clay and mud additives with water evenly to form mud. The stirring device 6 in the mixing tank 1 is kept in an open state at all times to stir the mud in the stirring tank 2 to prevent solute precipitation in the mud.

[0045] At this time, directional drilling operation can be carried out. During the operation, the return mud is automatically collected in the mixing tank 1 and is fully stirred by the stirring device 6 to be evenly mixed with the mud.

[0046] When the mud concentration reaches a predetermined value, the filtering device 7 in the mixing tank 1 is started to filter the waste in the mud and return the filtrate to the mud to dilute the mud.

[0047] When the mud slurry filtered by the filtering device 7 is insufficient to dilute the mud, clean water is directly injected into the mud to dilute the mud, so that the mud is kept within the standard specific gravity range and the working effect of the mud is maintained.

[0048] In the present application, the mixing tank 1 comprises a mixing tank 2, a filtering tank 3 and a power cavity 4, the mixing tank 2 is movably connected with a guide pipe 5 on the side wall near the drilling hole, the guide pipe 5 can penetrate the side wall of the mixing tank 2 and insert into the soil, the mixing tank 2 is provided with a stirring device 6, the filtering tank 3 is provided with a filtering device 7 for filtering the waste in the mud, and the power cavity 4 is provided with a driving part 8 for providing power for the stirring device 6 and the filtering part.

[0049] When the mixing tank 1 is used, the mixing tank 2 is used to mix and stir the mud raw materials to make them uniformly mixed, and after the returned mud returns to the mixing tank 2, the stirring device 6 can mix the mud carrying soil debris with the original mud uniformly, so that the soil impurities in the mud are filtered out by the filtering device 7, the specific gravity of the mud is maintained, the concentration of the mud is kept within the use range, the working effect of the mud is maintained, and the working effect of the mud is not affected by the too high concentration of the mud.

[0050] Further, a jack is formed in the side wall of the mixing tank 2, the guide pipe 5 can pass through the jack, and the guide pipe 5 is connected with the side wall of the mixing tank 2 by a plurality of bolts.

[0051] When the guide pipe 5 is installed, the guide pipe 5 is fixed to the side wall of the foundation pit through the jack, so that all the mud can be directly returned to the mixing tank 2 when the mud is returned, the mud leakage is prevented, the water in the mud is prevented from leaking into the foundation pit, the working environment is kept clean, the staff is not hindered by the mud leakage everywhere, and the backfilling work of the foundation pit after directional drilling is facilitated.

[0052] Preferably, a sealing part is arranged between the guide pipe 5 and the side wall of the mixing tank 2.

[0053] Preferably, the sealing part is a sealing gasket.

[0054] Furthermore, the stirring device 6 is a stirring frame rotatably installed at the bottom of the stirring tank 2; it is used to stir the raw materials when mixing the mud, so that the raw materials and water are mixed evenly, and when the return mud is mixed with the mud in the original stirring tank 2, the stirring device 6 can quickly mix the impurities in the return mud with the mud in the stirring tank 2 evenly, so as to facilitate filtering the impurities carried by the return mud, and the stirring device 6, which is always in working condition, can also prevent the mud in the stirring tank 2 from settling, thereby maintaining the working effect of the mud.

[0055] Furthermore, a mud pump 9 for pumping mud is provided in the power chamber 4, and the outlet of the mud pump 9 is connected to the filter device 7; the outlet of the mud pump 9 is connected to the raw material inlet of the filter press via a conduit, and the mud pump 9 is used to inject the mud mixed with soil debris discharged from the directional drilling into the filter device 7, so as to realize the automatic circulation of the mud in the mixing tank 1, and at the same time ensure that the filter device 7 can filter out the waste impurities in the mud in time, and retain the effective ingredients, such as raw materials such as clay and mud additives, maintain the concentration of the mud, and continue to remove the debris generated by the directional drilling.

[0056] The filtering device 7 is a filter press, which includes a beam 10, a thrust plate 11, multiple filter press plates 12 and a clamping plate 13 and a clamping mechanism 14. The filtrate outlet of the filter press is connected to the stirring tank 2, the thrust plate 11 is fixedly connected to the side wall of the stirring tank 2, the beam 10 is fixedly arranged in the filter tank 3, and the filter press plate 12 and the clamping plate 13 are slidably connected to the beam 10.

[0057] During the filtration process, first, the clamping mechanism 14 of the hydraulic telescopic component overlaps and compresses the multiple filter press plates 12 to prevent the mud from expanding and contracting. Then the mud pump 9 injects the mud in the stirring tank 2 between the multiple filter press plates 12 to filter the impurities and waste in the mud. At the same time, the filter press directly returns the filtered filtrate to the stirring tank 2 for diluting the mud. At the same time, the effective components in the mud are returned to the stirring tank 2 along with the filtrate, which plays the role of recycling the effective components in the mud. After one filtration is completed, the clamping mechanism 14 releases the squeeze on the clamping plate 13, and the springs between the multiple filter press plates 12 open the filter press plates 12, so that the soil filter cakes therein automatically fall off, realizing a single filter press operation. According to the above operation cycle, the function of continuous filtration of the mud in the stirring tank 2 is realized.

[0058] The filter press plate 12 includes a frame 15 and two filter plates 16 installed in the frame 15. The frame 15 is slidably connected to the beam 10. The outer side of the filter plate 16 is a raw material chamber 17, and the backwater chamber 18 is between the two filter plates 16.

[0059] Preferably, the mesh of the filter plate 16 is smaller than the size of sand and larger than the size of clay; it is used to intercept sand and debris in the mud, and release the effective components in the mud, such as clay and mud additives, to be reused as the filtrate refluxes, thereby maximizing the efficiency of the effective components in the mud.

[0060] Preferably, the thickness of the raw material cavity 17 formed by the filter plates 16 on the two adjacent filter press plates 12 is less than 0.5 cm; the small thickness of the raw material cavity 17 can prevent the mud from clogging the mesh holes on the filter plates 16, ensuring that the effective components in the mud can be recycled to the greatest extent and reducing the loss of effective components in the mud.

[0061] In the present invention, the stirring frame penetrates the filter tank 3 and extends into the power chamber 4, and a power source for providing power to the stirring frame is provided in the power chamber 4.

[0062] The driving device in the present invention is composed of a power source and a pressing mechanism 14 .

[0063] In the description of the present invention, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0064] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0065] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for preparing directional drilling mud, characterized in that: The following steps are involved: Step 1: first install a mixing tank (1); Step 2: prepare mud in the mixing tank (1) according to a standard concentration, and keep the stirring device (6) in the mixing tank (1) always in an open state; Step 3: perform directional drilling operations, during which the return mud is automatically collected in the mixing tank (1); Step 4: when the mud concentration reaches a predetermined value, start the filtering device (7) in the mixing tank (1) to filter the waste in the mud, and return the filtrate to the mud to dilute the mud; The mixing tank (1) comprises a stirring tank (2), a filtering tank (3) and a power chamber (4); a guide tube (5) is movably connected to the side wall of the stirring tank (2) near the drilling port; the guide tube (5) can penetrate the side wall of the stirring tank (2) and be inserted into the soil; a stirring device (6) is provided in the stirring tank (2); a filtering device (7) for filtering waste materials in the mud is provided in the filtering tank (3); and a driving component (8) for providing power to the stirring device (6) and the filtering component is provided in the power chamber (4); The filtering device (7) is a filter press, which includes a beam (10), a thrust plate (11), a plurality of filter press plates (12), a pressing plate (13), and a pressing mechanism (14); the filtrate outlet of the filter press is connected to the stirring tank (2); the thrust plate (11) is fixedly connected to the side wall of the stirring tank (2); the beam (10) is fixedly arranged in the filter tank (3); the filter press plates (12) and the pressing plates (13) are slidably connected to the beam (10); The filter press plate (12) includes a frame (15) and two filter plates (16) installed in the frame (15), the frame (15) is slidably connected to the beam (10), the outer side of the filter plate (16) is a raw material chamber (17), and the space between the two filter plates (16) is a return water chamber (18).

2. The method for preparing directional drilling mud according to claim 1, wherein: In step one, the installation method of the mixing tank (1) is as follows: step one: excavate a foundation pit at the drilling entrance and level the bottom of the foundation pit; step two: hoist the mixing tank (1) into the foundation pit; step three: nail the guide pipe (5) in the mixing tank (1) into the side wall of the foundation pit, and fix the guide pipe (5) on the side wall of the stirring tank (2).

3. The method for preparing directional drilling mud according to claim 1, wherein: In step 2, the slurry is prepared as follows: clay and slurry additives are prepared in proportion, and poured into a stirring tank (2) in a slurry mixing tank (1), water is gradually added thereto, and then a stirring device (6) is started to mix the clay and slurry additives with water to form slurry.

4. The method for preparing directional drilling mud according to claim 1, wherein: The side wall of the stirring tank (2) is provided with an insertion hole, through which the guide tube (5) can pass, and the guide tube (5) is connected to the side wall of the stirring tank (2) via a plurality of bolts.

5. The method for preparing directional drilling mud according to claim 1, wherein: The stirring device (6) is a stirring frame rotatably mounted on the bottom of the stirring tank (2).

6. The method for preparing directional drilling mud according to claim 1, wherein: A mud pump (9) for pumping mud is provided in the power chamber (4), and an outlet of the mud pump (9) is connected to a filtering device (7).

7. The method for preparing directional drilling mud according to claim 1, wherein: The mesh of the filter plate (16) is smaller than the size of sand and larger than the size of clay, and the thickness of the raw material cavity (17) formed by the filter plates (16) on two adjacent filter press plates (12) is less than 0.5 cm.

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