Drilling mud guard umbrella

Abstract

The utility model provides a mud blocking umbrella for well drilling, and belongs to the technical field of well drilling engineering machinery. The well drilling mud blocking umbrella comprises a center pipe and an umbrella body, a through hole matched with the center pipe is formed in the center of the bottom of the umbrella body, the upper portion of the center pipe forms a recovery section used for drilling fluid recovery, the center pipe is connected with the umbrella body, the recovery section penetrates through the through hole, the upper portion of the recovery section forms a blocking portion used for blocking foreign matter, and the lower portion of the recovery section forms a drainage portion used for drilling fluid to pass through. Foreign matters such as drilling fluid and clamp teeth are stopped on the umbrella body by the stopping part, the drilling fluid on the umbrella body enters the central pipe from the drainage part, and the foreign matters such as the clamp teeth in the drilling fluid are stopped on the umbrella body. Compared with the prior art, when the collecting amount of the drilling fluid is large, the drilling fluid can be effectively prevented from directly overflowing the blocking part, foreign matter such as clamp teeth in the drilling fluid can be effectively prevented from entering the annular space, a drill rod and a drill bit are prevented from being damaged, and the effect that the mud blocking umbrella blocks the foreign matter such as the clamp teeth is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of drilling engineering machinery, and particularly relates to a drilling mud blocking umbrella. BACKGROUND

[0002] In drilling construction, in order to cool and lubricate the drill bit, and to bring the rock debris in the drilling to the ground, drilling fluid is often pumped into the drill pipe, the drilling fluid enters from the top of the drill pipe and overflows from the drill bit, achieving cooling and lubrication of the drill bit, and the overflowed drilling fluid and the silt and rock debris in the drilling are mixed to form mud, which returns from the annulus between the drill pipe and the well wall. In order to realize the recycling of the drilling fluid, an anti-overflow pipe is often installed on the wellhead packer, the mud returns from the annulus between the drill pipe and the well wall and enters the anti-overflow pipe, and then is transported to the ground mud tank through the anti-overflow pipe for recycling. When the drilling tool is connected or the drilling is lifted, part of the drilling fluid will flow along the gap around the rotary table to the wellhead equipment and the ground around the wellhead, causing pollution and erosion to the equipment on the wellhead and the ground around it. At the same time, foreign objects such as tongs will fall on the rotary table during use, causing damage to the equipment below. In order to ensure the safety of the equipment on the wellhead and the cleanliness of the surrounding environment, a mud blocking umbrella needs to be installed on the anti-overflow pipe to collect the overflowed drilling fluid and the falling foreign objects such as tongs. The mud blocking umbrella is provided with a flow guide hole for guiding the drilling fluid in the umbrella surface out, and the foreign objects such as tongs are left on the mud blocking umbrella to avoid entering the annulus between the drill pipe and the well wall, which may cause damage to the drill pipe and the drill bit when the drill bit rotates at high speed. A collection tank for unified treatment of the drilling fluid is arranged below the drilling platform. The collection tank is 2 meters long, 2 meters wide and 1 meter deep. The collected drilling fluid is collected by the collection pipe through the flow guide hole on the mud blocking umbrella and into the collection tank, avoiding leakage of the drilling fluid and causing erosion and pollution to the wellhead equipment and the ground around the wellhead. Since the drilling is in the wild, the surrounding environment is harsh, and the drilling fluid collected into the collection tank is often contaminated by various foreign objects in the surrounding environment and cannot be recycled, resulting in waste of drilling fluid and increased construction cost.

[0003] A mud blocking umbrella is disclosed in Chinese Utility Model Patent No. CN215718601U, granted on February 1, 2022. The mud blocking umbrella includes a fixed part that is seated on the horn of the wellhead packer. The fixed part includes an umbrella body and a central pipe. A circular hole is formed in the center of the umbrella body, and the central pipe is connected to the bottom of the umbrella body at the top and communicates with the circular hole. The central pipe is seated in the horn. A retaining ring is provided around the circular hole, and a drainage hole is formed in the retaining ring. The umbrella body is used to collect the overflowed drilling fluid, which flows into the central pipe through the drainage hole and finally flows into the annulus through the wellhead packer. The drilling fluid and the silt and rock debris in the drilling form mud, which returns from the annulus between the drill pipe and the well wall into the mud recycling tank for recycling.

[0004] The drilling mud umbrella collects the drilling fluid overflowing from the drill pipe, and then the drilling fluid enters the well through the center pipe, mixes with the mud in the well, and is returned through the annulus between the drill pipe and the well, and finally enters the mud circulating tank to participate in the entire circulating system, thereby avoiding waste of the drilling fluid. However, when the umbrella body collects a large amount of drilling fluid, the flow guide through hole of the blocking ring is too small, and the drilling fluid is prone to accumulate and overflow the blocking ring due to the limited height of the blocking ring, so that the blocking ring cannot achieve good blocking effect; if the flow guide through hole of the blocking ring is too large, the blocking ring cannot block the tongs and other foreign matters. Utility model content

[0005] The utility model discloses a drilling mud umbrella, to solve the problem of the prior art when the umbrella body collects more drilling fluid, the blocking ring cannot achieve good blocking effect at this time.

[0006] To achieve the above object, the drilling mud umbrella provided by the utility model adopts the following technical scheme:

[0007] A drilling mud umbrella, including center pipe and umbrella body, the umbrella body bottom center is equipped with the through hole that is suitable for with center pipe, the upper portion of center pipe constitutes the recovery section for the recovery of drilling fluid, and the center pipe is connected with umbrella body, and the recovery section passes through the through hole, and the upper portion of recovery section constitutes the blocking portion for blocking foreign matters, and the lower portion constitutes the flow guide portion.

[0008] Beneficial effect: the utility model improves the drilling mud umbrella in the prior art. The utility model discloses that the center pipe passes through the umbrella body, and the part passing through the umbrella body constitutes the recovery section for the recovery of drilling fluid, the upper portion of recovery section constitutes the blocking portion for blocking the tongs and other foreign matters falling on the umbrella body, avoids the tongs and other foreign matters falling on the umbrella body from entering the annulus between the drill pipe and the well with the drilling fluid, causing damage to the drill pipe or drill bit, and the lower portion of recovery section constitutes the flow guide portion for guiding the drilling fluid collected by the umbrella body to the center pipe. Compared with the prior art, the center pipe directly passes through the bottom of the umbrella body, and the flow guide portion is located at the lower portion of the recovery section, so that the drilling fluid can be quickly guided, and accumulation of the drilling fluid on the umbrella body is avoided. The blocking portion is located at the upper portion of the recovery section, so that the blocking height is increased, and the blocking effect is improved. When the umbrella body collects a large amount of drilling fluid, the drilling fluid is prevented from overflowing the blocking portion, and the foreign matters are directly guided into the well with the drilling fluid, so that the blocking effect is improved.

[0009] Further, the flow guide portion is provided with a recovery hole on the peripheral surface.

[0010] Further, the number of the recovery holes is not less than 2.

[0011] Further, the recovery holes are uniformly distributed around the central pipe axis.

[0012] Further, the recovery holes are provided with a protective net.

[0013] Further, the minimum diameter of the mesh of the protective net is smaller than the minimum diameter of the jaw.

[0014] Further, the structure of the drainage part is a mesh structure.

[0015] Further, the minimum diameter of the mesh of the mesh structure is smaller than the minimum diameter of the jaw.

[0016] Further, the central pipe is divided into two sections from bottom to top, i.e., a first central pipe and a second central pipe, the recovery section is located on the second central pipe, and the height of the first central pipe is consistent with the height of the blowout preventer of a set model.

[0017] Further, the first central pipe and the second central pipe are connected through flanges. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a structural schematic view of one embodiment of the drilling mud blocking umbrella.

[0019] In the figure, 1 is a first grouting line interface, 2 is a first central pipe, 3 is a second grouting line interface, 4 is a second central pipe, 5 is a flow guide pipe interface, 6 is a recovery hole, 7 is a lifting lug, 8 is a supporting rod, 9 is an umbrella body, 10 is a drainage part, and 11 is a blocking part. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application, i.e., the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] The present application will be further described in detail below in combination with the embodiments.

[0022] In the process of oil drilling, drilling fluid will flow out and pollute the wellhead equipment and the ground around the wellhead when tripping in or out. Therefore, it is necessary to use a drilling mud umbrella to collect the drilling fluid falling on the drilling platform. The drilling fluid collected by the mud umbrella is directly discharged to a collection tank near the wellhead for waste treatment, and the collected drilling fluid is not recycled, causing waste of drilling fluid.

[0023] To solve the above problems, the prior art discloses a technical solution, that is, the center pipe of the mud umbrella is seated on the horn mouth, a circular hole is arranged at the bottom of the umbrella body, the center pipe is communicated with the circular hole, a retaining ring is arranged around the circular hole, a drainage through hole is arranged on the retaining ring, the drilling fluid collected by the umbrella body flows into the center pipe from the drainage through hole on the retaining ring, and finally flows into the well for recycling. In the above solution, the retaining ring is used to prevent foreign matters such as tongs on the umbrella body from entering the well and causing damage to the drill pipe or drill bit, and the drainage through hole on the retaining ring is used to guide the drilling fluid to the center pipe. However, due to the limited height of the retaining ring, when there is too much drilling fluid on the umbrella body, the drilling fluid directly flows over the retaining ring, and the effect of preventing foreign matters such as tongs is limited.

[0024] The utility model discloses in order to avoid the drilling fluid of umbrella body to accumulate too much and flow over the retaining ring, cause foreign matter with drilling fluid to enter the well, simultaneously in order to guarantee that drilling fluid can be recycled into the center pipe, can also fully prevent the tongs and other foreign matters in the drilling fluid on the umbrella body, the utility model discloses a mud umbrella adopts the following scheme: the center pipe that passes through the umbrella body part constitutes the recovery section, the upper part of recovery section constitutes the preventing part, is used for preventing the drilling fluid and the tongs and other foreign matters outside the center pipe, the lower part constitutes the drainage part, and the drilling fluid collected by the umbrella body is guided to the center pipe, and finally flows to the mud tank and participates in the recycling.

[0025] Specifically, as shown in the figure, Figure 1 The bottom center of the umbrella body 9 is provided with a through hole matched with the center pipe, so that the center pipe can pass through the through hole and be closely connected with the umbrella body 9, preventing the collected drilling fluid from leaking out of the gap between the center pipe and the umbrella body 9 and causing erosion and pollution to the equipment on the wellhead and the ground around the wellhead, and also ensuring that the recovery section of the center pipe can smoothly pass through the umbrella body 9. In the embodiment, Figure 1 The center pipe is in a cylindrical shape, and the through hole in the bottom center of the umbrella body 9 is a circular hole with the same diameter as the outer diameter of the center pipe. In other embodiments, the shape of the center pipe can be flexibly selected according to specific use requirements, and the through hole in the bottom center of the umbrella body 9 can be kept matched with the center pipe.

[0026] The upper part of the center pipe constitutes a recovery section for recycling of the drilling fluid, the center pipe is connected with the umbrella body 9, the recovery section passes through the through hole, the upper part of the recovery section constitutes a preventing part 11 for blocking foreign matters such as tongs, the preventing part 11 prevents the tongs and other foreign matters in the drilling fluid from entering the center pipe, and the lower part constitutes a drainage part 10 for passing of the drilling fluid, which is used to guide the drilling fluid to the center pipe.

[0027] The drainage part 10 is provided with recovery holes 6 on the circumferential surface, and drilling fluid enters the central pipe from the recovery holes 6. The number of recovery holes 6 is not less than 2, and the recovery holes 6 are uniformly distributed around the central pipe axis on the circumferential surface of the drainage part 10, so as to ensure that the drilling fluid collected on the umbrella body quickly flows into the central pipe. The more the number of recovery holes is, the faster the drilling fluid enters the annulus. When the drilling fluid receiving amount is large, the accumulation and overflow of the drilling fluid on the umbrella surface are avoided, and the wellhead equipment and the ground around the wellhead are prevented from being polluted.

[0028] In Figure 1 In an embodiment, a protective screen is arranged in the recovery hole 6 to filter the drilling fluid, and the minimum diameter of the screen mesh is smaller than the minimum diameter of the tong teeth. During drilling, the tong teeth may fall off around the rotary table. If the tong teeth enter the annulus along with the drilling fluid and move at a high speed, the drilling pipe and the drill bit will be damaged. Designing the minimum diameter of the screen mesh to be smaller than the minimum diameter of the tong teeth can prevent the tong teeth and other foreign matters from entering the annulus along with the drilling fluid. In another embodiment, the drainage part 10 is a mesh structure, and the minimum diameter of the mesh of the mesh structure is smaller than the minimum diameter of the tong teeth.

[0029] In Figure 1 In an embodiment, the central pipe is divided into two sections from bottom to top, namely a first central pipe 2 and a second central pipe 4, and the recovery section is arranged on the second central pipe 4. The second central pipe 4 is provided with a flow guide pipe interface 5, and the second central pipe 4 is provided with a second grouting line interface 3 below the flow guide pipe interface 5. The first central pipe 2 is provided with a first grouting line interface 1.

[0030] The sum of the heights of the first central pipe 2 and the second central pipe 4 is not greater than the distance from the blowout preventer to the well platform surface. In Figure 1 In an embodiment, the blowout preventer of a specified type is an annular blowout preventer, and the height of the first central pipe 2 is the same as the height of the annular blowout preventer of the specified type. When the annular blowout preventer is not installed on the blowout preventer, if the second central pipe 4 is directly installed on the blowout preventer, the umbrella body 9 will be far away from the well platform. When there is wind, the drilling fluid falling on the rotary table will be scattered and cannot be fully collected. At this time, the second central pipe 4 is connected to the first central pipe 2 through a flange. Since the height of the first central pipe 2 is equal to the height of the annular blowout preventer, the umbrella body 9 can be close to the well platform surface, the drilling fluid can be fully received without replacing the mud umbrella, and the waste of resources caused by preparing two mud umbrellas to adapt to two different use scenarios is avoided. The second central pipe 4 is provided with a second grouting line interface 3. In actual use, the second grouting line interface 3 is blocked and not used. When grouting is needed, the drilling fluid collected in the mud tank enters the central pipe through the first grouting line interface 1.

[0031] When the blowout preventer is installed on the wellhead, the second central pipe 4 is directly installed on the blowout preventer, at this time the height of the umbrella body 9 is close to the drilling platform, the drilling fluid on the rotary table can be fully received, at this time the processed drilling fluid enters the second central pipe 2 through the second grouting line interface 3, and is recycled. Figure 1 In the embodiment, the distance between the upper edge of the umbrella body 9 and the top end of the second central pipe 4 is 600 cm, the umbrella body 9 is a quadrilateral funnel, the top edge length of the umbrella body 9 is 3000 cm, and the bottom edge length is 2000 cm. In other embodiments, the heights of the first central pipe 2 and the second central pipe 4 can be flexibly designed according to the model of the selected annular blowout preventer, so that the mud blocking umbrella can fully collect the drilling fluid when the annular blowout preventer is installed on the wellhead and when the annular blowout preventer is not installed. In addition, the size and height of the umbrella body 9 can also be flexibly designed according to the size and height of the drilling platform, so that the drilling fluid can be fully received.

[0032] Specifically, the second central pipe 4 is provided with a plurality of support rods 8 to support the umbrella body 9, the support rods 8 support the umbrella body 9, so that the umbrella body 9 is more stable, and the umbrella body 9 is not easy to deform when in contact with the ground during storage under the action of the support rods 8. The top end of the stop portion 11 is provided with two lifting lugs 7, and the two lifting lugs 7 are symmetrically distributed in the axial direction of the second central pipe 4, so that the mud blocking umbrella is more convenient to install and disassemble.

[0033] In combination with the above embodiment, the specific working process of the mud blocking umbrella of the utility model is as follows: when the annular blowout preventer is installed on the wellhead, the first central pipe 2 and the second central pipe 4 are disassembled, and then the second central pipe 4 is directly installed on the annular blowout preventer by hooking the lifting lug 7. The umbrella body 9 collects the drilling fluid flowing out of the drill pipe or the drill bit, the collected drilling fluid flows into the second central pipe 4 through the recovery hole 6, and the foreign matters such as jaws in the drilling fluid are blocked on the umbrella body 9. The drilling fluid enters the annulus from the second central pipe 4, mixes with the silt and cuttings in the well, and forms the mud, which is returned between the drill pipe and the well, then is discharged to the overhead groove through the collection pipe through the flow guide pipe interface 5, and then is filtered through the vibrating screen and enters the mud tank. The drilling fluid collected into the mud tank is pumped into the drilling tool through the mud pump for recycling.

[0034] When the annular blowout preventer is not installed on the wellhead, the first central pipe 2 and the second central pipe 4 are connected together through the flange, the first central pipe 2 is installed on the annular blowout preventer by hooking the lifting lug 7, the second grouting line interface 3 is blocked and not used, the drilling fluid collected by the umbrella body 9 finally enters the mud tank through the flow guide pipe interface 5, and then is pumped into the drilling tool through the mud pump for recycling.

Claims

1. A drilling mud retaining umbrella comprising a central pipe and an umbrella body, a through hole adapted to the central pipe is arranged at the bottom center of the umbrella body, the upper part of the central pipe constitutes a recovery section for drilling fluid recovery, the central pipe is connected with the umbrella body, characterized in that, The recovery section passes through the through hole, and an upper part of the recovery section forms a stop part for blocking foreign matters, and a lower part of the recovery section forms a flow guiding part for passing drilling fluid.

2. The drilling mud deflecting umbrella of claim 1, wherein, A recovery hole is arranged on a peripheral surface of the flow guiding part.

3. The drilling mud deflecting umbrella of claim 2, wherein, The number of the recovery holes is not less than 2.

4. The drilling mud deflecting umbrella of claim 3, wherein, The recovery holes are uniformly distributed around a central pipe axis.

5. A drilling mud deflecting umbrella according to any one of claims 2-4, characterized in that A protective net is arranged in the recovery hole.

6. The drilling mud deflecting umbrella of claim 5, wherein, A minimum diameter of the protective net is less than a minimum diameter of the tongs.

7. The drilling mud deflecting umbrella of claim 1 wherein, The flow guiding part is in a mesh structure.

8. The drilling mud deflecting umbrella of claim 7, wherein, A minimum diameter of the mesh structure is less than the minimum diameter of the tongs.

9. The drilling mud deflecting umbrella of claim 1, wherein, The central pipe is divided into two sections from bottom to top, i.e., a first central pipe and a second central pipe, the recovery section is arranged on the second central pipe, and a height of the first central pipe is consistent with a height of a set model blowout preventer.

10. The drilling mud deflecting umbrella of claim 9, wherein, The first central pipe and the second central pipe are connected through flanges.

Images