Directional drilling opposite-penetrating slurry pressure balancing device

Abstract

The utility model discloses a directional drill opposite penetrating mud pressure balancing device which comprises a pilot pipe, a first reamer bit, a second reamer bit and an end structure, the first reamer bit and the second reamer bit are arranged on the pilot pipe in an axial displacement mode so as to be used for digging pipeline holes along the pilot pipe, and the end structure is arranged on the pilot pipe. End structures are arranged at the two ends of the pilot pipe, the end structures are used for sealing the two end openings of the pipeline hole, each end structure comprises a steel sleeve and a sealing cylinder, the steel sleeve is arranged on the periphery of the pilot pipe in a sleeving mode, a communicating cavity communicating with the pipeline hole is formed between the steel sleeve and the pilot pipe, and the sealing cylinders are arranged in the communicating cavity. The sealing cylinder is arranged on the periphery of the pilot pipe in a sealed and sleeved mode, and the sealing cylinder is connected with the end of the steel sleeve in a sealed mode. The technical scheme is used for solving the problem that the work of a reamer is affected due to the fact that slurry is guided out from one side in existing directional drill opposite-penetrating construction.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas pipeline construction, and in particular relates to a directional drilling cross-penetration mud pressure balancing device. Background Art

[0002] During directional drilling construction, the mud ejected from the reamer returns from the ground exit and entry points. Normally, the mud will flow out from the side where the reamer is closer to the hole opening.

[0003] In the conventional reverse-pull reaming process, if the reamer is close to the excavation point, the mud pumped into the earth from the entrapment side will flow out from the excavation side, causing the mud to be unable to circulate normally. This can be done by adding a mud treatment system and a mud pump at the excavation point. When the reamer is close to the excavation point, the mud is supplied from the excavation point. When the reamer is close to the entrapment point, the mud can return from the entrapment point and the mud is supplied from the entrapment point.

[0004] However, for forward push reaming from both sides simultaneously, when the reaming length of one side exceeds 50% of the total length, the mud pumped in from both sides will flow out from the side with the shorter distance, and no mud will return to the hole opening on the side farther from the reamer, resulting in failure to work normally, affecting construction safety and efficiency. Utility Model Content

[0005] In view of the above-mentioned technical problems, the utility model provides a directional drilling cross-cutting mud pressure balancing device to solve the problem of unilateral discharge of mud in existing directional drilling cross-cutting construction, which affects the operation of the reamer. The directional drilling cross-cutting mud pressure balancing device can ensure the balance of mud outflow at both ends and improve construction efficiency.

[0006] The utility model provides a directional drilling cross-mud pressure balancing device, comprising a pilot tube, a first reaming drill bit, a second reaming drill bit and an end structure, wherein the first reaming drill bit and the second reaming drill bit can be axially displaced on the pilot tube to dig a pipeline hole along the pilot tube, both ends of the pilot tube are provided with end structures, the end structures are used to close the two ends of the pipeline hole, the end structure comprises a steel casing and a sealing cylinder, the steel casing is sleeved on the outer periphery of the pilot tube, a connecting cavity connected to the pipeline hole is formed between the steel casing and the pilot tube, the sealing cylinder is sealingly sleeved on the outer periphery of the pilot tube, and the sealing cylinder is sealingly connected to the end of the steel casing, the side wall of the steel casing is provided with a slurry outlet connected to the connecting cavity, and a throttle valve is provided at the slurry outlet.

[0007] Furthermore, a sealing material is provided between the sealing cylinder and the pilot tube.

[0008] Furthermore, two ends of the sealing tube are respectively provided with a first flange and a second flange, the first flange is connected to the end of the steel casing, and the second flange is connected to the outer wall of the pilot tube.

[0009] The directional drilling cross-cutting mud pressure balancing device provided by the utility model installs a steel casing and a sealing cylinder at the port of the pipeline hole of the directional drilling hole, and seals the mud in the pipeline hole in combination with the sealing material in the cylinder. By adjusting the opening of the throttle valve, the flow rate and pressure of the returning mud are adjusted, and the mud return pressure at one end is increased, so that the mud can return from the other side. By adjusting the amount of mud returned on both sides, the amount of mud pumped in and returned at both ends is basically balanced, so as to achieve the purpose of continuous construction. The directional drilling cross-cutting mud pressure balancing device can efficiently control and adjust the return pressure of the mud from the hole according to the construction needs of ultra-long directional drilling, distribute the mud return volume at both ends of the directional drilling, improve the construction efficiency of directional drilling, and can also play an important role in dealing with adverse geological risks such as water seepage and cracks in the crossing holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 It is a structural schematic diagram of a directional drilling mud pressure balance device;

[0012] Figure 2 is a structural schematic diagram of the end structure;

[0013] Figure 3 It is a schematic diagram of the structure of the sealing cylinder. DETAILED DESCRIPTION

[0014] The utility model discloses a directional drilling cross-penetration mud pressure balancing device, which can ensure the balance of mud outflow at both ends and improve construction efficiency.

[0015] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, what is described is only a part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0016] See also Figure 1 to Figure 3As shown, the utility model discloses a directional drilling cross-mud pressure balancing device, comprising a pilot pipe 2, a first reaming drill bit 4, and an end structure 1 of a second reaming drill bit 5. The first reaming drill bit 4 and the second reaming drill bit 5 can be axially displaced on the pilot pipe 2 to dig a pipeline hole 3 along the pilot pipe 2. Both ends of the pilot pipe 2 are provided with end structures 1, and the end structure 1 is used to close the two ends of the pipeline hole 3. The end structure 1 comprises a steel casing 6 and a sealing cylinder 9. The steel casing 6 is sleeved on the outer periphery of the pilot pipe 2, and a connecting cavity 13 connected to the pipeline hole 3 is formed between the steel casing 6 and the pilot pipe 2. The sealing cylinder 9 is sealingly sleeved on the outer periphery of the pilot pipe 2, and the sealing cylinder 9 is sealingly connected to the end of the steel casing 6. The side wall of the steel casing 6 is provided with a slurry outlet 8 connected to the connecting cavity 13, and a throttle valve 7 is provided at the slurry outlet 8.

[0017] A sealing material 10 is provided between the sealing cylinder 9 and the pilot tube 2 .

[0018] The two ends of the sealing tube 9 are respectively provided with a first flange 12 and a second flange 11 , wherein the first flange 12 is connected to the end of the steel casing 6 , and the second flange 11 is connected to the outer wall of the pilot tube 2 .

[0019] The directional drilling cross-through mud pressure balancing device provided by the utility model installs a steel casing 6 and a sealing cylinder 9 at the port of the pipeline hole 3 of the directional drilling hole, and seals the mud in the pipeline hole 3 in combination with the sealing material 10 in the cylinder. By adjusting the opening of the throttle valve 7, the flow rate and pressure of the returning mud are adjusted, and the mud return pressure at one end is increased, so that the mud can return from the other side. By adjusting the amount of mud returned on both sides, the amount of mud pumped in and returned at both ends is basically balanced, so as to achieve the purpose of continuous construction. The directional drilling cross-through mud pressure balancing device can efficiently control and adjust the return pressure of the mud from the hole according to the construction needs of ultra-long directional drilling, distribute the mud return amount at both ends of the directional drilling, improve the construction efficiency of directional drilling, and can also play an important role in dealing with adverse geological risks such as water seepage and cracks in the crossing holes.

[0020] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A directional drilling mud pressure balance device, characterized in that: The invention comprises a pilot tube, a first reaming drill bit, a second reaming drill bit and an end structure. The first reaming drill bit and the second reaming drill bit can be axially displaced on the pilot tube so as to be used for digging a pipeline hole along the pilot tube. Both ends of the pilot tube are provided with end structures, and the end structures are used to close the two ends of the pipeline hole. The end structure comprises a steel casing and a sealing cylinder. The steel casing is sleeved on the outer circumference of the pilot tube, and a connecting cavity connected to the pipeline hole is formed between the steel casing and the pilot tube. The sealing cylinder is sealingly sleeved on the outer circumference of the pilot tube, and the sealing cylinder is sealingly connected to the end of the steel casing. The side wall of the steel casing is provided with a slurry outlet connected to the connecting cavity, and a throttle valve is provided at the slurry outlet.

2. A directional drilling mud pressure balance device according to claim 1, characterized in that: A sealing material is provided between the sealing cylinder and the pilot tube.

3. A directional drilling mud pressure balance device according to claim 1, characterized in that: The two ends of the sealing cylinder are respectively provided with a first flange and a second flange, the first flange is connected to the end of the steel casing, and the second flange is connected to the outer wall of the pilot pipe.

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