A continuous automatic cuttings cleaning device

Abstract

The present invention relates to the field of geological logging rock cuttings cleaning equipment, specifically a continuous automatic rock cuttings cleaning device. It includes a special-shaped coil extending from top to bottom, a nozzle and a screen extending along the axial direction of the coil are arranged in the coil, a drain port is provided near the lower pipe mouth of the coil, an arc-shaped block is provided on the downstream side of the drain port, the bottom of the arc-shaped block is connected to the inner wall of the coil, and the top of the arc-shaped block is connected to the screen; the nozzle is located at the top of the coil, and a number of water spray holes facing the bottom of the coil are opened on the nozzle; the screen is installed at the bottom of the coil, and a space for water flow is left between the screen and the bottom of the coil. The present invention can realize efficient and continuous sand washing operations in on-site construction operations and daily applications, liberates labor, saves labor costs, and ensures the efficiency of rock cuttings cleaning. The device is safe and reliable, has a scientific principle, is highly advanced, is easy to use, and has a high degree of automation.

Description

Technical Field

[0001] The present invention relates to the field of geological logging cuttings cleaning equipment, and particularly to a continuous automatic cuttings cleaning device. Background Art

[0002] Drilling fluid (jargon called mud) refers to the fluid medium used during the drilling process. Drilling fluid can be liquid or gas, so drilling fluid should be accurately called drilling fluid. During the drilling process, the circulating flushing medium used in the hole is also called borehole flushing fluid. Drilling fluid can be classified into clear water, mud, clay-free flushing fluid, emulsion, foam, compressed air, etc. according to its composition. Clear water is the earliest used drilling fluid, which requires no treatment, is easy to use, and is suitable for intact rock formations and areas with sufficient water sources. Mud is a widely used drilling fluid, mainly suitable for unstable hole wall rock formations such as loose, fissure-developed, easy to collapse and slough, and swelling and peeling when encountering water. The main functions of drilling fluid are: (1) cleaning the bottom of the well and carrying cuttings; (2) cooling and lubricating the drill bit and drill string; (3) balancing the lateral pressure of the wellbore rock; (4) balancing (controlling) formation pressure; (5) suspending cuttings and weighting agents; (6) being able to remove sand and cuttings on the ground; (7) effectively transmitting hydraulic power; (8) bearing part of the gravity of the drill pipe and casing; (9) providing a large amount of information about the drilled formation; (10) hydraulically fracturing rocks.

[0003] In the exploration of oil and gas resources, the main work of geological logging is the observation and analysis of rock cuttings, which is also an important basis for formation evaluation and oil and gas resource evaluation. The cuttings carried back to the surface by the drilling fluid after being impacted and broken by the drill bit underground are all attached with drilling fluid dirt. To observe and analyze the cuttings, the attached dirt must be cleaned with clear water to restore the true color of the underground rock. Therefore, cuttings cleaning has become an important task at the geological logging site. The conventional cleaning method for rock cuttings is a basin and a stick. However, with the proposal and continuous deepening of fine and efficient exploration, this simple rock cuttings cleaning method no longer meets various new technical requirements and cannot keep up with the process of on-site operation automation. Therefore, there is an urgent need for a new type of cuttings cleaning device to replace the traditional cuttings cleaning operation mode.

[0004] For a long time, the sand washing operation in geological logging has been a simple but heavy physical labor. The sand fishing personnel place a sand receiving basin downstream of the drilling fluid vibrating screen. Cuttings vibrate from the vibrating screen into the sand fishing basin. After a predetermined cuttings lag time, the sand fishing personnel carry the concentrated sand in the sand fishing basin to a large water tank to flush with water and repeatedly stir with a stirring rod. When the water gets dirty, the sand fishing personnel need to pour out the water and then add clean water to wash again. This process is repeated until the cuttings are cleaned, and then they are carried to a designated location for the next step. For cuttings, some are easy to clean and meet the requirements after being washed several times; some are extremely difficult to clean and may not be clean until they are washed ten or twenty times. During the entire cleaning process, the sand fishing personnel expend a great deal of physical strength, regardless of wind or rain, mainly due to the cleaning process. Therefore, sand fishing and washing have become heavy physical labor for geological sand fishing personnel. Generally speaking, there are the following problems:

[0005] ① It occupies labor and increases labor costs;

[0006] ② The operation risk is high and the safety of cross-operation is low;

[0007] ③ The work efficiency is low and the cleaning effect of cuttings is poor;

[0008] ④ The labor intensity is high and it is not conducive to occupational health protection;

[0009] ⑤ It is difficult to centrally treat the sand washing wastewater, which cannot be recycled and pollutes the environment;

[0010] ⑥ The continuity of the sand washing operation is poor and it is not conducive to protecting the benefits of oil and gas exploration;

[0011] ⑦ It is impossible to realize the automation of the cuttings cleaning operation and it cannot meet the scientific and standardized requirements.

[0012] Therefore, an efficient sand washing operation device is urgently needed at the oil and gas exploration site. Summary of the Invention

[0013] The present invention aims at the problems existing in the prior art and provides a continuous and automatic cuttings cleaning device.

[0014] The technical solution is as follows:

[0015] A continuous automatic cuttings cleaning device includes a special-shaped coiled pipe extending from top to bottom. Inside the coiled pipe, there is a spray pipe and a screen that extend along the axial direction of the coiled pipe. A drain port is opened near the lower pipe orifice of the coiled pipe. On the downstream side of the drain port, there is an arc-shaped baffle. The bottom of the arc-shaped baffle is connected to the inner wall of the coiled pipe, and the top of the arc-shaped baffle is connected to the screen. The spray pipe is located at the top of the coiled pipe, and a number of water spray holes are opened on the spray pipe facing the bottom of the coiled pipe. The screen is installed at the bottom of the coiled pipe, and there is a space for water flow between the screen and the bottom of the coiled pipe. It also includes a vibration assembly, and the vibration assembly is connected to the coiled pipe. The vibration assembly includes a vibration table, support ribs, vibration springs, a vibrator, and a base. The vibration table is installed on the base through the vibration springs. The vibrator is fixedly installed on the vibration table. The support ribs support the coiled pipe on the vibration table. There are wheels under the base.

[0016] Further, the coiled pipe is composed of two upper and lower semi-pipe bodies that are buckled together. Lock catches and lock noses are respectively provided on the two semi-pipe bodies. Flanges and grooves for sealed plug-in cooperation are respectively opened on the buckling surfaces of the two semi-pipe bodies.

[0017] Furthermore, above the upper pipe orifice of the coiled pipe, there is a water inlet connected to the spray pipe. Above the upper pipe orifice of the coiled pipe, there is an air inlet connected to the coiled pipe. The drain port is connected to a filter barrel. The filter barrel is provided with a sewage inlet connected to the drain port and a filtered water outlet connected to an external water tank. In the middle of the filter barrel, there is a partition filter screen. The sewage inlet is connected to a sewage pipe that extends to the bottom of the filter barrel. The filtered water outlet is connected to a filtered water pipe that extends below the partition filter screen. The orifice of the filtered water pipe is located upstream of the orifice of the sewage pipe.

[0018] The beneficial effects of the present invention are as follows:

[0019] ① It liberates the labor force in production operations and reduces the labor cost of manual operations;

[0020] ② It eliminates the risks of manual operations and does not affect the safety of cross operations;

[0021] ③ It has high cleaning work efficiency and good cuttings cleaning effect;

[0022] ④ It reduces the labor intensity of personnel and is conducive to the occupational health protection of workers;

[0023] ⑤ The sand washing sewage is centrally treated and can be recycled repeatedly, protecting the construction operation environment and saving water resources;

[0024] ⑥ The sand washing operation has high continuity, which is conducive to improving the efficiency of oil and gas exploration and the level of on-site standardization operations;

[0025] ⑦ It realizes the automation of cuttings cleaning operations and meets the requirements of scientific and standardized production. Description of the Drawings

[0026] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 is a schematic diagram of the butt-jointed structure of two semi-tubes;

[0028] Figure 3 is a schematic diagram of the positions of the nozzle and the screen;

[0029] Figure 4 is a schematic diagram of the screen structure;

[0030] Figure 5 is a schematic diagram of the structure at the lower nozzle of the coil pipe;

[0031] Figure 6 is a schematic diagram of the filter barrel structure;

[0032] Figure 7 is a schematic diagram of the sub-filter screen structure;

[0033] In the figure: 1 coil pipe, 2 nozzle, 3 screen, 4 support rib, 5 lock, 6 air inlet, 7 water inlet, 8 cleaning port, 9 cuttings inlet, 10 cuttings outlet, 11 drain port, 12 vibrating table, 13 vibrating spring, 14 vibrator, 15 base, 16 fixing hole, 17 sand receiving table, 18 mid-tangent line, 19 flange, 20 groove, 21 lock nose, 22 running wheel, 23 clamping plate, 24 fixing hole, 25 filter barrel, 26 sub-filter screen, 27 clamp, 28 cover, 29, filtered water outlet, 30 lifting ring, 31, sewage inlet, 32 top cleaning port, 33 bottom cleaning port, 34 support leg, 35 screwing, 36 perforation, 37 clamp hole, 38 clamping plate groove, 39 drain port block. Specific embodiments

[0034] Please refer to the attached drawings. A continuous automatic cuttings cleaning device, which is made of high-quality stainless steel as a whole, includes a coil pipe, a vibrating table, a vibrator, a base, a sand receiving table, a filter barrel, etc.

[0035] The coil pipe is a special-shaped pipe composed of two butt-jointed semi-tubes. The upper nozzle is the cuttings inlet, and the lower nozzle is the cuttings outlet. A sand receiving table is placed below the lower nozzle. The inner diameter of the coil pipe is 150mm × wall thickness 10mm. The height from the upper part of the cuttings inlet pipe wall to the lower part of the cuttings outlet pipe wall is 600mm, the spiral inclination angle is 30º, and the spiral diameter is 550mm. The cuttings inlet coil pipe is at an angle of 30º obliquely upward, and the cuttings outlet coil pipe is at an angle of 30º obliquely downward. The coil pipe is cut in half along the cross-section and butt-jointed in two parts. A spiral nozzle is welded in a groove at the top inside the pipe.

[0036] On the mating surfaces of the two semi-tubes, there are respectively provided a flange and a groove for sealed plug-in fit. The flange has a height of 10 mm × a width of 5 mm; the groove has a depth of 10 mm × a width of 5 mm. On the outer walls of the two coiled tubes, there are respectively provided a locking buckle and a locking nose, and the two semi-coiled tubes are mated and combined to form a closed whole. 10 locking buckles and locking noses are evenly arranged on the entire coiled tube. Using the coiled tube 1 can save the operation space area of the device. Moreover, it can increase the cleaning area within a limited space range, and under the action of the reciprocating spiral inclination rate, the cleaning effect is improved.

[0037] In the center of the top of the upper coiled tube, a groove extending along the coiled tube is opened, and a spray pipe is inlaid in the groove. The outer diameter of the spray pipe is 20 mm × the wall thickness is 3 mm, and the spray pipe is seamlessly welded and inlaid with the coiled tube. Three rows of spray holes with a diameter of 5 mm are opened at the bottom of the spray pipe. The longitudinal center hole row spacing is 3 mm, and the transverse center hole spacing is 50 mm, that is, the three rows of spray holes form a fan-shaped spray screen; water flow is sprayed downward to the bottom of the lower coiled tube.

[0038] Inside the bottom coiled tube, a screen is radially arranged with the same curvature as the coiled tube, and the screen extends along the coiled tube. The mesh number of the screen is determined according to actual needs. The screen is arranged at a position 50 mm from the inner bottom of the coiled tube, that is, below the screen is a sewage flow spiral channel with a height of 50 mm. The screen is made by laser drilling a 1-mm-thick steel plate, and the drilling mesh number is determined according to needs. Different screen mesh intervals can also be drilled on the steel plate. A perforated clamping plate with the same curvature as the coiled tube is arranged at a position 50 mm from the inner bottom of the coiled tube. The perforated clamping plate is welded to the inner wall of the coiled tube, and the perforated clamping plate and the clamping plates on both sides of the screen are fastened with screws through holes. The screen starts from the cuttings inlet and extends 50 mm to the cuttings outlet;

[0039] At a position 50 mm from the tube opening at the top of the coiled tube, that is, an air inlet valve with a diameter of 20 mm is installed on the top spray pipe as the air inlet. The air inlet is inclined at an angle of 30º to the tube opening towards the spray pipe. Gas is injected into the spray pipe through the air inlet to produce a spraying and atomizing effect;

[0040] At a position 50 mm from the air inlet at the top of the coiled tube, that is, a water inlet valve with a diameter of 20 mm is installed on the top spray pipe as the water inlet. The water inlet is inclined at an angle of 30º to the tube opening towards the spray pipe. Water flow is sprayed into the spray pipe through the water inlet, and an atomizing spraying effect is produced under the action of the air flow at the air inlet;

[0041] At a position 70 mm from the tube opening at the bottom of the coiled tube, a cleaning valve with a diameter of 20 mm is installed by opening a hole as the cleaning port. The cleaning port is inclined at an angle of 30º to the bottom of the coiled tube towards the tube opening. The cleaning port is used as a spare port, and water or air flow can be injected to clean the screen in the reverse direction;

[0042] At the bottom of the coiled tube, at a position 50 mm from the tube opening, perpendicular to the coiled tube, a drain valve is arranged as the drain port. The drain port has a diameter of 50 mm and is used to collect the sewage after washing the cuttings into the filter bucket through a flexible pipeline.

[0043] At the position near the pipe orifice of the drain outlet, closely adjacent to the opening edge of the drain outlet and below the screen, an arc-shaped block is arranged. The arc of the block fits the inner wall of the coil pipe. The sewage filtered into the spiral channel below the screen is intercepted by the block and led to the drain outlet, while the washed rock debris enters the sand receiving table along the extended part of the screen;

[0044] The washed rock debris enters the sand receiving table under the action of vibration along the extended part of the screen. The sand receiving table is a circular basin with three supporting corners, and an arc-shaped rock debris discharge port is opened on one side of the basin. The diameter of the circular basin is 300mm × height 150mm × wall thickness 3mm.

[0045] The supporting ribs are used to support the coil pipe, and one supporting rib is welded and arranged on each of the three bends of the coil pipe. The supporting rib is a steel bar with a diameter of 30mm, the top is welded to the bottom of the coil pipe, and the bottom is welded to the tabletop of the vibrating table.

[0046] The vibrating table is a plane, which is used to support the coil pipe and transmit the vibration. The vibrating table is 400mm in length × 500mm in width × 5mm in thickness. Four high-strength springs are arranged at the four corners of the bottom of the vibrating table, and the high-strength springs are connected to the base.

[0047] The vibrator is fixed at the center position of the base through the fixing holes. The vibration of the vibrator is transmitted to the supporting ribs through the vibration springs to drive the coil pipe to resonate.

[0048] The base is 400mm in length × 500mm in width × 5mm in thickness. The base is fixed to other base surfaces through the fixing holes on the four sides. Four casters can be installed at the four corner positions below the base. The whole cleaning device can be shifted through the casters. At the same time, the casters can also increase the amplitude of the overall vibration.

[0049] The filter barrel is used to hold the sewage collected and discharged from the drain outlet for repeated reuse, so as to protect the environment and save water resources. The filter barrel is a cylinder, with an outer diameter of 600mm × height 800mm × wall thickness 5mm. Three supporting legs are evenly welded at the bottom of the filter barrel.

[0050] The upper part of the filter barrel is provided with a cover, which is buckled on the barrel. A lifting ring is arranged in the middle of the cover, and a sewage inlet and a filtered water outlet are arranged on both sides. ① Sewage inlet. The sewage discharged from the bottom drain of the coil pipe is connected to the sewage inlet on the cover of the filter barrel through a flexible pipeline. The opening diameter of the sewage inlet on the cover is 50 mm, that is, an open valve is welded on the cover. Inside the filter barrel of the sewage inlet is a steel pipe with a diameter of 50 mm × a length of 700 mm × a wall thickness of 3 mm, and the steel pipe passes through the sub-filter screen inside the barrel; ② Filtered water outlet. The opening diameter of the filtered water outlet on the cover is 50 mm, that is, an open valve is welded on the cover. Inside the filter barrel of the filtered water outlet is a steel pipe with a diameter of 50 mm × a length of 250 mm × a wall thickness of 3 mm, and the steel pipe passes through the sub-filter screen inside the barrel. The sewage is precipitated at the bottom of the barrel, and the upper clear water is pumped and discharged through the filtered water outlet for recycling;

[0051] On one side of the upper part of the filter barrel, a steel pipe with an inner diameter of 50 mm × a length of 100 is installed 150 mm away from the top of the barrel as the top cleaning port. After the cuttings are washed, the oily sewage will float on the upper part, and thus it can be pumped and discharged through the top cleaning port and will no longer enter the recycling. A section of hose can be sleeved on the steel pipe. When there is no sewage discharge, the hose can be tied tightly to prevent sewage from flowing out;

[0052] On one side of the bottom of the filter barrel, a hole with a diameter of 50 mm is opened parallel to the bottom edge, and a section of steel pipe is welded as the bottom cleaning port. The bottom cleaning port is used as the discharge port for the bottom sediment. A section of hose can be sleeved on the steel pipe. When there is no sewage discharge, the hose can be tied tightly to prevent sewage from flowing out;

[0053] The sub-filter screen is a perforated steel plate with a wall thickness of 2 mm × a diameter of 590 mm, which is used to filter the oil in the sewage and block other suspended matters. Two holes with a diameter of 50 mm are opened on the sub-filter screen at the positions corresponding to the sewage inlet and the filtered water outlet for the corresponding steel pipes to pass through. A clamp port is also opened on the sub-filter screen for passing through the clamp and screwing;

[0054] The clamp is a steel hoop. By screwing the clamp in and out, the diameter of the steel hoop is adjusted to make it adhere to the barrel wall, which is used for the high and low positioning of the sub-filter screen. The sub-filter screen is lapped on the lower clamp, and then fixed by pressing with the upper clamp.

[0055] The working principle of the present invention is:

[0056] Cuttings and dirt enter the sieve inside the coiled pipe through the cutting inlet. Under the combined action of tangential impact of cleaning water, tangential blowing of additional air flow, vibration of the sieve body, and the slope of the spiral surface, they move forward along the bending direction of the coiled pipe. During the forward movement, they are scoured and washed by the cleaning water from the nozzle. Washing plus vibration increases the cleaning rate of the cutting particles and dirt. The sewage after cutting cleaning deposits in the pipe under the sieve, bends downward along the curvature direction of the coiled pipe, converges to the drain outlet when hitting the baffle block, and flows into the filter barrel through the flexible pipe. In the barrel, impurities and oil are removed through sedimentation and screening, and then enter the water inlet for recirculation under the pumping action. If recirculation is not required, the water inlet can be not connected, and the sewage at the water inlet is directly discharged outside. The filter barrel is placed specifically according to actual needs, and the flexible pipe is connected to the drain outlet to avoid the restriction of fixed placement space. This continuous automatic cutting cleaning device can be used for decontamination cleaning of wet cuttings with dirt, or can be used alone as a filtering function for a kind of particulate matter.

Claims

1. A continuous automatic cuttings cleaning device, characterized in that, It includes a special-shaped coiled pipe extending from top to bottom, and a spray pipe and a screen extending along the axial direction of the coiled pipe are arranged inside the coiled pipe; A spiral downward extending flow passage is formed inside the coiled pipe. The flow passage is separated by the screen into a first flow passage and a second flow passage that respectively spiral downward. And in any radial cross-section of the coiled pipe, the first flow passage is always located above the second flow passage; The upper port of the first flow passage is the cuttings inlet, and the lower port of the first flow passage is the cuttings outlet; A drain port is opened at a position near the lower pipe orifice of the coiled pipe, and the drain port is communicated with the second flow passage; An arc-shaped baffle is arranged inside the second flow passage and on the downstream side of the drain port for blocking the lower end outlet of the second flow passage. The bottom of the arc-shaped baffle is connected to the inner wall of the coiled pipe, and the top of the arc-shaped baffle is connected to the screen; The spray pipe is located inside the first flow passage, and a number of water spray holes facing the screen are opened on the spray pipe; The screen is erected at the bottom of the coiled pipe, and a second flow passage for water flow is formed between the screen and the inner bottom wall of the coiled pipe.

2. The continuous automatic cuttings cleaning device according to claim 1, characterized in that, It further includes a vibration assembly, and the vibration assembly is connected to the coiled pipe.

3. The continuous automatic cuttings cleaning device according to claim 2, characterized in that, The vibration assembly includes a vibration table, a support rib, a vibration spring, a vibrator, and a base. The vibration table is erected on the base through the vibration spring; the vibrator is fixedly arranged on the vibration table; the support rib supports the coiled pipe on the vibration table.

4. The continuous automatic cuttings cleaning device according to claim 3, characterized in that, Wheels are arranged below the base.

5. The continuous automatic cuttings cleaning device according to any one of claims 1-4, characterized in that, The coiled pipe is composed of two upper and lower semi-pipe bodies buckled together, and a lock and a lock nose are respectively arranged on the two semi-pipe bodies.

6. The continuous automatic cuttings cleaning device according to claim 5, characterized in that, Flanges and grooves for sealing plug-in cooperation are respectively opened on the buckling surfaces of the two semi-pipe bodies.

7. The continuous automatic cuttings cleaning device according to claim 6, characterized in that, An inlet connected to the spray pipe is arranged above the upper pipe orifice of the coiled pipe.

8. The continuous automatic cuttings cleaning device according to claim 7, characterized in that, An air inlet connected to the coiled pipe is arranged above the upper pipe orifice of the coiled pipe.

9. The continuous automatic cuttings cleaning device according to any one of claims 1-4 or 6-8, characterized in that, The drain port is communicated with a filter barrel.

10. The continuous automatic cuttings cleaning device according to claim 9, characterized in that, The filter barrel is provided with a sewage inlet communicated with the drain port, a filtered water outlet communicated with an external water tank. A sub-filter screen is arranged in the middle of the filter barrel. The sewage inlet is communicated with a sewage pipe extending to the bottom of the filter barrel. The filtered water outlet is communicated with a filtered water pipe extending below the sub-filter screen, and the orifice of the filtered water pipe is located upstream of the orifice of the sewage pipe.

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