New oil injection structure and oil injection method for roller drill bit

Abstract

The present invention relates to the technical field of drilling tools, and in particular to a novel oil injection structure and method for a roller drill bit. The structure comprises a vacuum gun and an oil injection gun. A connecting hole is provided on the back of the drill bit, the connecting hole communicating with an elongated oil hole in the pressure shoe. The vacuum gun is connected to the connecting hole, and the oil injection gun is connected to an oil cup and an oil bag. This device separates the oil injection gun and the vacuum gun. The vacuum gun independently draws vacuum through the connecting hole on the back of the drill bit, while the oil injection gun exclusively injects oil. This eliminates the need to clean residual grease each time, allowing the drill bit to be used directly, thus avoiding grease waste and improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum drilling tools, in particular to a novel oil injection structure and oil injection method for a roller drill bit. Background Art

[0002] The roller drill bit is a commonly used oil drilling tool, with three-cone drill bits being used in large proportions. By connecting to a top drive or a mud motor, the drill bit is loaded to rotate and perform rock drilling. The roller drill bit rotates along with the top drive or motor, while the cone rotates around the shaft neck. A dynamic seal structure is used between the drill bit and the shaft diameter to prevent drilling fluid or mud and other foreign matter from entering the bearing system, ensuring the integrity of the bearing system and its service life. If the seal fails or the bearing is excessively worn, the roller drill bit will fail. In order to more effectively extend the life of the bearing, the roller drill bit has a pressure balance system with continuous oil supply. The oil reservoir device contains a certain quality of special lubricating grease. The grease is resistant to high temperatures and has formed industry standards for wear resistance. The oil reservoir, through the pressure balance system, will continuously supply grease to the bearing until the pressure is rebalanced when grease is lost inside the bearing.

[0003] The current oil injection method is as follows Figure 3 As shown, the oil needle is inserted into the oil bladder through the center hole of the gland. The upper connector is sealed with a rubber ring when screwed in to prevent spills during oiling. A conversion connector is fixed to the oil needle connector. A quick-connect connector is provided on the back. The center connector of the grease gun is quickly connected. Then, turn the conversion valve wrench to connect the vacuum line, closing the oil filling line. Vacuuming begins, reducing the pressure in the oil bladder, even to negative pressure. This causes the rubber bladder to deform and flatten. Then, when the lubricator's pressure gauge reaches the desired vacuum level, switch the valve wrench, closing the vacuum line and connecting the oil filling line. Oil is then injected through the combined action of the oil pump and vacuum, preventing the formation of bubbles. Figure 3 The inner hole in the oil cup and the oil storage bag is filled with oil, and the outer hole is filled with oil into the oil bag, the outer space of the oil cup, that is, the oil hole and the long oil hole, and the bearing system. When the oil filling is completed, the oil filling hole on the gland is sealed with a screw plug to complete the oil filling.

[0004] However, after each oiling, grease will remain in the oiling needle and the pipeline from the conversion joint to the oil gun. When vacuuming again, the residual grease must be cleaned up, which causes grease waste. The wasted grease cannot be directly reused and requires a special device to vacuum remove bubbles. Therefore, high requirements are placed on the equipment or serious waste is caused. Moreover, continuous oiling cannot be performed, resulting in reduced efficiency. Summary of the Invention

[0005] In order to effectively solve the problems in the above-mentioned background technology, the present invention proposes a new oil injection structure and oil injection method for a roller drill bit.

[0006] The specific technical solutions are as follows:

[0007] A new oil injection structure for a roller drill bit includes a vacuum gun and an oil injection gun. A connecting hole is provided on the back of the tooth palm, the connecting hole is connected to the long oil hole in the pressure palm, the vacuum gun is connected to the connecting hole, and the oil injection gun is connected to the oil cup and oil bag.

[0008] Preferably, the vacuum gun includes a body, a wrench, a lever, a vacuum tube and a rubber core bag. The middle part of the body is provided with a conical cavity, the lower part of the conical cavity is provided with a connecting port, the middle part of the wrench is connected to the upper part of the body through the lever, one end of the wrench is hinged to one end of the connecting rod, the other end of the connecting rod passes through the upper part of the body and is connected to the upper part of the rubber core bag, the lower part of the rubber core bag is provided with a plug, the plug cooperates with the connecting port, the vacuum tube is connected to the side of the body and communicates with the conical cavity.

[0009] Preferably, the vacuum tube is connected to a vacuum pump.

[0010] A method for oiling, using the novel oiling structure of a roller drill bit, comprises the following steps: step 1, connecting a vacuum gun and an oiling gun to the connection hole on the back of the bit palm and the gland of the oil storage system respectively; step 2, starting the vacuum gun to start vacuuming, and when the vacuuming is completed, closing the valve of the vacuum gun; step 3, starting the oiling gun, opening the oiling valve and the oiling pump, and starting oiling, and after the oiling is completed, sealing the hole on the back of the bit palm and the gland hole with a screw plug.

[0011] Compared with the prior art, the beneficial effect of the present invention is that the device separates the grease gun and the vacuum gun. The vacuum gun draws vacuum through the connecting hole on the back of the tooth palm, and the grease gun is used exclusively for oil filling. There is no need to clean the residual grease every time, and the grease gun can be used directly, thus avoiding grease waste and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] Figure 2 Schematic diagram of the structure of the vacuum gun in the present invention;

[0014] Figure 3 It is a structural diagram of the prior art. DETAILED DESCRIPTION

[0015] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0016] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments. Figure 1 As shown, a new oil filling structure of a roller drill bit includes a vacuum gun 1 and an oil filling gun 2. A connecting hole 3 is provided on the back of the tooth palm, and the connecting hole is connected to the long oil hole 4 in the pressure palm. The vacuum gun is connected to the connecting hole, and the oil filling gun is connected to the oil cup and oil bag 5. A suitable small hole is drilled on the back of the tooth palm to connect with the long oil hole. A gun is used, as shown in the figure, to connect with the pressure cover of the oil storage system. Then the valve is closed and the oil filling pipe is in a closed state. Another gun is used with a sealing design, which is installed and connected to the hole on the back of the palm and is specifically used for vacuuming. When the vacuuming is completed, the valve of the vacuum gun is closed. Open the oil filling valve and the oil filling pump, and start oiling. After the oiling is completed, the hole on the back of the palm and the hole on the pressure cover are both sealed with wire plugs.

[0017] Of course, when filling oil, if the old structure is also used, the muzzle position of the vacuum gun may have a small degree of back suction, but the waste will be reduced a lot and the continuity can be guaranteed. Of course, the back suction problem can be eliminated by improving some valves, such as changing the ball valve structure to a conical valve structure and closing the end of the vacuum gun, which can almost eliminate the back suction. Of course, it is not limited to this conical valve structure.

[0018] In addition, the oil filling position can connect the oil needle directly to the oil gun, shorten the gun barrel length, and directly connect the oil needle to the oil filling gun through the quick connector structure.

[0019] The vacuum gun includes a body 6, a wrench 7, a lever 8, a vacuum tube 9, and a rubber core bladder 10. The body has a tapered cavity 11 in the middle, with a connection port 12 at the bottom. The wrench's middle is connected to the body's upper portion via the lever. One end of the wrench is hinged to one end of a connecting rod, and the other end of the connecting rod passes through the body's upper portion and connects to the rubber core bladder's upper portion. The rubber core bladder has a plug 13 at the bottom that fits into the connection port. The vacuum tube is connected to the side of the body and communicates with the tapered cavity. The vacuum tube is connected to a vacuum pump.

[0020] The improved vacuum gun structure is of course not limited to this type of gun head. The side is a vacuum tube, which is connected to the vacuum pump. The cavity inside the gun head is a conical structure at the top and bottom, and the core in the middle is also conical. Of course, the gap between the inner cavity and the cone can be adjusted as needed. Even the upper and lower halves can add a straight cavity to increase stability and prevent the middle core from tilting toward the vacuum port when vacuuming.

[0021] The surface of the middle core can be covered with a layer of rubber to increase the sealing performance when in contact with the cavity.

[0022] When the upper connecting rod is moved, it is a lever structure. The middle core is lifted up to seal the upper part and keep the lower part unobstructed. At this time, vacuum can be drawn. When the vacuum is completed, the lever is lifted up and the middle core is pressed down to the conical cavity in the lower part. The lower part is blocked and the vacuum gun is closed, which can also prevent the problem of backflow during oil injection.

[0023] The above is just a simple schematic diagram of a structure. The shape of the middle core can be adjusted to increase the center straightening.

[0024] In terms of manufacturing, the position of the vacuum port can be adjusted to divide the cavity into two parts, and after the middle core is installed, the upper and lower parts are welded together using more precise welding methods such as argon arc welding or laser welding. The vacuum tube joint can be made into one piece, or it can be assembled through threaded connections and sealing rings and other structures.

[0025] Of course, the present invention is not limited to this structure, as long as it can be fully sealed and the port of the vacuum gun can be sealed when closed.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A new oil injection structure for a roller drill bit, characterized by: It includes a vacuum gun and an oiling gun. A connecting hole is provided on the back of the tooth palm. The connecting hole is connected to the long oil hole in the pressure palm. The vacuum gun is connected to the connecting hole, and the oiling gun is connected to the oil cup and oil bag. The vacuum gun includes a body, a wrench, a lever, a vacuum tube, and a rubber core bag. The middle portion of the body is provided with a tapered cavity, the lower portion of the tapered cavity is provided with a connecting port, the middle portion of the wrench is connected to the upper portion of the body through the lever, one end of the wrench is hinged to one end of a connecting rod, the other end of the connecting rod passes through the upper portion of the body and is connected to the upper portion of the rubber core bag, the lower portion of the rubber core bag is provided with a plug, the plug is engaged with the connecting port, the vacuum tube is connected to the side portion of the body and communicates with the tapered cavity; The vacuum tube is connected to a vacuum pump.

2. A method for oil injection, characterized in that: The novel oil injection structure of the roller drill bit according to claim 1 includes the following steps: step 1, connecting the vacuum gun and the oil injection gun to the connection hole on the back of the bit palm and the gland of the oil storage system respectively; step 2, starting the vacuum gun and starting vacuuming. When the vacuuming is completed, the valve of the vacuum gun is closed; step 3, starting the oil injection gun, opening the oil injection valve and the oil injection pump, and starting oil injection. After the oil injection is completed, the palm back hole and the gland hole are both sealed with a screw plug.

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