Novel continuous oil pipe spray gun equipment

Abstract

The invention relates to novel coiled tubing spray gun equipment which comprises a hydraulic spray gun, a rotational flow short section and a flow dividing short section, and a plurality of spray holes are evenly formed in the hydraulic spray gun at intervals; one end of the cyclone nipple is communicated with one end of the hydraulic spray gun, and the other end is communicated with an oil pipe; the shunting short section is connected to the other end of the hydraulic spray gun; and one end of the shunting short section extends into the hydraulic spray gun. The spray gun has the beneficial effects that the structure is simple, the design is reasonable, the non-uniformity of different perforation particle concentrations of a single-stage spray gun and the particle concentration difference between two-stage spray guns can be effectively reduced, and the spray gun has the characteristics of simple structure, long service life, easiness in installation and the like; in addition, in the using process of the device, particulate matter in liquid can be dispersed, and the particulate matter can be more evenly distributed along the section of the pipe. When the device is not used, particles are easy to settle, and the particles are more dispersed after the rotational flow structure is adopted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of unconventional oil and gas reservoir development, and particularly relates to a new coiled tubing spray gun device. BACKGROUND

[0002] Multi-stage horizontal well fracturing technology is increasingly applied to the development of unconventional oil and gas reservoirs, and an integrated multi-stage fracturing tool can simultaneously fracture multiple reservoirs to form a connected channel, which is beneficial to oil and gas production. The current hydraulic jet fracturing spray gun adopts a circumferential arrangement of nozzles. During abrasive perforation, the particle concentration of several nozzles at the same axial position is not uniform due to the influence of the particle's own gravity. Since the abrasive perforation rate is affected by the particle concentration, the perforation opening rate at the same axial position is not the same, and in severe cases, some holes are deeper, and some holes do not penetrate the casing and the formation.

[0003] Multi-stage horizontal well fracturing usually uses coiled tubing technology, which can be successfully carried out under pressure without the need for well killing, causing less damage to the formation. At the current stage, the hydraulic drive pipe string used in the traditional mode is very complex, resulting in more content and slower speed during the use of the pipe string. The coiled tubing string does not contain a connecting shaft, which not only allows construction under pressure, but also speeds up the construction.

[0004] However, although coiled tubing has the huge advantages that traditional tubing lacks, there are still some deficiencies in the application of this technology. For example, some oilfields blindly introduce coiled tubing operation equipment without understanding the scope and types of coiled tubing operation machines, which may result in the introduction of spare parts that cannot be used or incomplete operation tools that cannot be used; in some oilfields, the quality supervision is not strict or the personnel responsible for the introduction are not professional, resulting in frequent failures during use after introduction; and many oilfields lack professionals familiar with coiled tubing operation machine technology, which makes it difficult to solve some problems of coiled tubing operation machines during operation, greatly limiting the use of coiled tubing operation machines.

[0005] With the coiled tubing technology, downhole operations can achieve higher application efficiency, which can promote the rapid development of the oil industry and provide more abundant energy support for the development of the national economy. It is believed that in the future development, as people's understanding of coiled tubing technology deepens and the technology improves, it will play a greater role in oil exploration and development and produce huge economic and social benefits.

[0006] Furthermore, for the coiled tubing connecting multiple gun integrated perforating and fracturing process, affected by the inertial force of the proppant in the sand-carrying fluid, the upstream gun will have less particles, and the downstream gun will have particle accumulation phenomenon, so a gun internal throttling device is needed to make the particle content of each stage gun tend to be average, so as to ensure that the perforation rates of each stage gun are similar. SUMMARY

[0007] The present application provides a new coiled tubing gun device to solve the problems in the prior art.

[0008] The technical scheme of the present application to solve the above technical problems is as follows:

[0009] A new coiled tubing gun device, comprising a hydraulic gun, a cyclone sub and a flow dividing sub, the hydraulic gun is uniformly and spacedly provided with multiple perforating holes; one end of the cyclone sub is in communication with one end of the hydraulic gun, and the other end is used for communicating with the tubing; the flow dividing sub is connected to the other end of the hydraulic gun, and one end thereof extends into the hydraulic gun.

[0010] The present application has the following beneficial effects: during use, the entire device is placed horizontally or at a certain inclination angle with the horizontal plane, liquid + sand enters from the cyclone sub, and the cyclone sub performs preliminary stirring of the sand; then, the flow dividing sub is used to stir the sand again, so that the sand is uniformly sprayed from the multiple perforating holes of the gun, improving the non-uniformity of the single-stage gun circumferential perforation and fracturing particles, and reducing the non-uniformity of particles between multiple guns.

[0011] The present application has the following beneficial effects: during use, the entire device is placed horizontally or at a certain inclination angle with the horizontal plane, liquid + sand enters from the cyclone sub, and the cyclone sub performs preliminary stirring of the sand; then, the flow dividing sub is used to stir the sand again, so that the sand is uniformly sprayed from the multiple perforating holes of the gun, improving the non-uniformity of the single-stage gun circumferential perforation and fracturing particles, and reducing the non-uniformity of particles between multiple guns.

[0012] On the basis of the above technical scheme, the present application can also be improved as follows.

[0013] Further, the flow dividing sub comprises a sub body, a flow dividing pipe and a motor, one end of the sub body is connected to the other end of the hydraulic gun; the flow dividing pipe is coaxially installed in the sub body, one end of the flow dividing pipe extends into the hydraulic gun after sequentially penetrating through one end of the sub body and the other end of the hydraulic gun; the motor is installed in the sub body, and the driving end of the motor is in transmission connection with the other end of the flow dividing pipe, for driving the flow dividing pipe to rotate.

[0014] The beneficial effect of the further scheme is that the motor drives the shunt pipe to rotate during use, so that the shunt pipe stirs the sand in the hydraulic jet gun, and the sand is uniformly sprayed from the multiple spray holes of the hydraulic jet gun.

[0015] Further, the other end of the short section body is provided with a plug, and the plug abuts against the motor.

[0016] The beneficial effect of the further scheme is that the structure is simple, the plug is reasonably designed, the cable joint can be installed, the motor can be axially limited, and the plug is convenient to disassemble and assemble.

[0017] Further, the driving end of the motor is connected with one end of the connecting shaft, and the other end of the shunt pipe is connected with the other end of the connecting shaft through the multiple cylindrical keys.

[0018] The beneficial effect of the further scheme is that the motor is connected with the shunt pipe through the connecting shaft during use, so that the connecting shaft drives the shunt pipe to rotate, and the sand is uniformly sprayed from the multiple spray holes of the hydraulic jet gun.

[0019] During assembly, the multiple cylindrical keys are used to connect the shunt pipe with the connecting shaft, which is convenient to disassemble and assemble, saves time and effort.

[0020] Further, the short section body is further provided with a deep groove ball bearing set and a top ring, the deep groove ball bearing set is rotatably sleeved outside the connecting shaft, and the top ring is rotatably sleeved outside the connecting shaft and abuts against the deep groove ball bearing set and the other end of the shunt pipe at both ends.

[0021] The beneficial effect of the further scheme is that the structure is simple and reasonable, the top ring and the deep groove ball bearing set are used to limit the connecting shaft.

[0022] Further, the cyclone short section comprises a cylinder body and a spiral roller, the cylinder body is hollow inside and open at both ends, one end of the cylinder body is communicated with one end of the hydraulic jet gun, and the other end of the cylinder body is used to communicate with an oil pipe; the spiral roller is coaxially rotatably installed in the cylinder body, the spiral roller is hollow inside and open at both ends, and a spiral groove set is formed on the inner wall of the spiral roller.

[0023] The beneficial effect of the further scheme is that the spiral roller is circumferentially rotated under the radial force in the spiral roller inside the cyclone short section under the pushing of the internal medium during use, so that the sand is preliminarily stirred.

[0024] Further, the spiral groove set comprises multiple spiral grooves, and the multiple spiral grooves are spirally distributed on the inner wall of the spiral roller.

[0025] The beneficial effect of the further scheme is that the multiple spiral grooves are designed reasonably, so that the sand rotates spirally in the spiral roller to generate a radial force to achieve preliminary stirring of the sand.

[0026] Further, the depth of the multiple spiral grooves is 5-20mm, and the two ends of the multiple spiral grooves have a chamfer of 30-60°.

[0027] The beneficial effect of the further scheme is that the depth and distribution of the spiral grooves are reasonable, and the sand can be stirred better.

[0028] Further, the two ends of the spiral roller in the cylinder are respectively provided with tapered roller bearings.

[0029] The beneficial effect of the further scheme is that the structure is simple and reasonable, and the two ends of the spiral roller are pressed by the tapered roller bearings, and can rotate circumferentially through the center liquid flow.

[0030] Further, the cylinder is provided with a step, and the two ends of one of the tapered roller bearings are respectively in abutment with the step and one end of the spiral roller; one end of the cylinder is provided with an end cap, and the two ends of the other tapered roller bearing are respectively in abutment with the other end of the spiral roller and the end cap.

[0031] The beneficial effect of the further scheme is that the two tapered roller bearings and the spiral roller are directly placed in the cylinder, and are sealed by the end cap, which is convenient to disassemble and assemble, saving time and effort. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 It is a schematic diagram of the overall structure of the present application;

[0033] Fig. 2 It is a schematic diagram of the structure of the cyclone sub in the present application;

[0034] Fig. 3 It is a schematic diagram of the structure of the flow distribution sub in the present application.

[0035] In the drawings, the components represented by each reference numeral are listed as follows:

[0036] 1, water jet; 2, cyclone sub; 3, flow distribution sub; 4, jet hole; 5, sub body; 6, flow distribution pipe; 7, motor; 8, plug; 9, connecting shaft; 10, cylindrical key; 11, top ring; 12, cylinder; 13, spiral roller; 14, spiral groove; 15, tapered roller bearing; 16, end cap; 17, O-ring; 18, deep groove ball bearing; 19, shaft sleeve; 20, sealing ring. DETAILED DESCRIPTION

[0037] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in the case of no conflict.

[0038] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise specified.

[0039] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0041] Embodiment 1

[0042] As Figs. 1 to 3 shown, the present embodiment provides a new type of coiled tubing spray gun device, which comprises a hydraulic spray gun 1, a cyclone sub 2 and a shunt sub 3, a plurality of spray holes 4 are uniformly and spaced apart on the hydraulic spray gun 1; one end of the cyclone sub 2 is communicated with one end of the hydraulic spray gun 1, and the other end is used to communicate with the tubing; the shunt sub 3 is connected to the other end of the hydraulic spray gun 1, and one end thereof extends into the hydraulic spray gun 1.

[0043] During use, the whole device is placed horizontally or at a certain inclination with the horizontal plane, liquid + sand enters from the cyclone sub 2, and the cyclone sub 2 uniformly stirs the sand; then, the shunt sub 3 is used to stir the sand again, so that the sand is uniformly sprayed from the plurality of spray holes 4 on the hydraulic spray gun 1, which improves the single-stage spray gun circumferential perforation and reduces the particle non-uniformity between the plurality of spray guns.

[0044] It should be noted that the above water jet gun 1 uses the prior art, and its specific structure and principle will not be described here.

[0045] Based on the above scheme, the entire device is mainly used for multi-stage integrated water sandblasting perforation and fracturing process of horizontal wells or high-deviation wells.

[0046] The embodiment has the advantages of simple structure, reasonable design, long service life, easy installation, etc. In addition, during use of the device, particles in the liquid can be dispersed to be more uniformly distributed along the pipe cross section. When the device is not used, particles can be more dispersed after adopting the cyclone structure.

[0047] Example 2

[0048] In this embodiment, the flow dividing nipple 3 includes a nipple body 5, a flow dividing pipe 6, and a motor 7. One end of the nipple body 5 is connected to the other end of the water jet gun 1. The flow dividing pipe 6 is coaxially installed in the nipple body 5, and one end of the flow dividing pipe 6 extends into the water jet gun 1 through the one end of the nipple body 5 and the other end of the water jet gun 1. The motor 7 is installed in the nipple body 5, and the driving end of the motor 7 is in transmission connection with the other end of the flow dividing pipe 6 to drive the flow dividing pipe 6 to rotate.

[0049] During use, the motor 7 drives the flow dividing pipe 6 to rotate, so that the flow dividing pipe 6 stirs the sand in the water jet gun 1, and the sand can be uniformly sprayed out of the multiple jet holes 4 of the water jet gun 1.

[0050] Preferably, in this embodiment, the inner wall of one end of the nipple body 5 is provided with internal threads, and the other end of the water jet gun 1 is in threaded connection with the internal threads.

[0051] Preferably, in this embodiment, the nipple body 5 has a cylindrical structure.

[0052] In addition, the flow dividing pipe 6 has a tubular structure with a hollow interior and open ends.

[0053] Preferably, in this embodiment, the flow dividing pipe 6 is uniformly and spacedly provided with multiple O-shaped sealing rings 17 at a position corresponding to one end of the nipple body 5, and the outer wall of the flow dividing pipe 6 is provided with multiple annular grooves corresponding to the multiple O-shaped sealing rings 17.

[0054] In addition, the O-shaped sealing rings 17 are preferably three, and the three O-shaped sealing rings 17 are uniformly and spacedly distributed along the axial direction of the flow dividing pipe 6.

[0055] Alternatively, the number of the O-shaped sealing rings 17 can be designed according to requirements.

[0056] Embodiment 3

[0057] In this embodiment, based on the embodiment 2, the other end of the short section body 5 is provided with a plug 8, and the plug 8 abuts against the motor 7.

[0058] The scheme has simple structure and reasonable plug design, and can realize installation of the cable joint and axial positioning of the motor 7, and is convenient to disassemble and assemble.

[0059] Preferably, in this embodiment, the plug 8 is threadedly connected with the other end of the short section body 5, that is, the plug 8 is provided with threads, and the other end of the short section body 5 is provided with internal threads.

[0060] Embodiment 4

[0061] In this embodiment, based on any one of the embodiments 2 to 3, the driving end of the motor 7 is connected with one end of a connecting shaft 9, and the other end of the shunt pipe 6 is connected with the other end of the connecting shaft 9 through a plurality of cylindrical keys 10.

[0062] In use, the motor 7 is connected with the shunt pipe 6 through the connecting shaft 9, so that the shunt pipe 6 is driven to rotate by the connecting shaft 9, and the sand is uniformly sprayed from the plurality of spray holes 4 on the water jet gun 1.

[0063] In assembly, the shunt pipe 6 is connected with the connecting shaft 9 through the plurality of cylindrical keys 10, which is convenient to disassemble and assemble and saves time and effort.

[0064] Preferably, in this embodiment, the plurality of cylindrical keys 10 is preferably four, the other end of the connecting shaft 9 extends into the other end of the shunt pipe 6, the other end of the shunt pipe 6 is uniformly and spaced apart in the circumferential direction and is provided with four through holes, and the other end of the connecting shaft 9 is uniformly and spaced apart in the circumferential direction and is provided with four screw holes, the four cylindrical keys 10 penetrate through the four through holes and are respectively threadedly connected with the four screw holes, so as to connect the shunt pipe 6 with the connecting shaft 9, which is convenient to disassemble and assemble.

[0065] Based on the above scheme, the motor 7 drives the connecting shaft 9 to rotate, drives the cylindrical keys 10 to rotate, and drives the shunt pipe 6 to rotate together, the spiral groove 14 formed on the outer side of the shunt pipe 6 generates annular rotational flow, and the particles are dispersed to form uniform distribution.

[0066] Embodiment 5

[0067] In this embodiment, based on embodiment 4, a deep groove ball bearing set and a top ring 11 are further installed in the short section body 5, the deep groove ball bearing set is rotatably sleeved outside the connecting shaft 9, and the top ring 11 is rotatably sleeved outside the connecting shaft 9 and abuts against the deep groove ball bearing set and the other end of the shunt pipe 6 at both ends, respectively.

[0068] The scheme has simple structure and reasonable design, and the cooperation of the top ring 11 and the deep groove ball bearing set can limit the connecting shaft 9.

[0069] Preferably, in this embodiment, the deep groove ball bearing set includes two deep groove ball bearings 18, and the two deep groove ball bearings 18 are rotatably sleeved on the connecting shaft 9 to right the connecting shaft 9.

[0070] In addition, a shaft sleeve 19 is installed between the driving end of the motor 7 and one end of the connecting shaft 9 to play a radial fixing role.

[0071] Preferably, in this embodiment, a plurality of, for example, two sealing rings 20 are arranged between the outer wall of the connecting shaft 9 and the inner wall of the shunt pipe 6.

[0072] Embodiment 6

[0073] In this embodiment, based on the above-mentioned embodiments, the cyclone short section 2 includes a cylinder body 12 and a spiral roller 13, the cylinder body 12 is hollow inside and open at both ends, one end of the cylinder body 12 is communicated with one end of the hydraulic lance 1, and the other end is used to communicate with an oil pipe; the spiral roller 13 is coaxially rotatably installed in the cylinder body 12, is hollow inside and open at both ends, and a spiral groove set is processed on the inner wall of the spiral roller 13.

[0074] In use, under the internal medium, the spiral roller 13 generates a radial force inside to rotate circumferentially, so as to preliminarily stir the sand.

[0075] Preferably, in this embodiment, the cylinder body 12 and the spiral roller 13 are preferably both cylindrical structures open at both ends.

[0076] In addition, the cylinder body 12 is preferably a structure with thin ends and a thick middle part, one end of the cylinder body 12 is provided with external threads, one end of the hydraulic lance 1 is provided with internal threads, and one end of the hydraulic lance 1 is threadedly connected with one end of the cylinder body 12.

[0077] Embodiment 7

[0078] In this embodiment, based on embodiment 6, the spiral groove set includes a plurality of spiral grooves 14, and the plurality of spiral grooves 14 are distributed in a spiral shape on the inner wall of the spiral roller 13.

[0079] The plurality of spiral grooves 14 are designed to make sand rotate spirally on the spiral roller 13 to generate radial force to achieve preliminary stirring of the sand.

[0080] Embodiment 8

[0081] In this embodiment, the depth of the plurality of spiral grooves 14 is 5-20mm, and the two ends of the plurality of spiral grooves 14 are respectively provided with a 30-60° chamfer.

[0082] The depth and distribution of the spiral grooves 14 are reasonable, which can better stir the sand.

[0083] Preferably, the depth of the plurality of spiral grooves 14 is preferably 10mm.

[0084] In addition, the two ends of the plurality of spiral grooves 14 are respectively provided with a 45° chamfer.

[0085] Embodiment 9

[0086] In this embodiment, the cylinder 12 is provided with a tapered roller bearing 15 corresponding to the two ends of the spiral roller 13.

[0087] This scheme has simple structure and reasonable design, and the two ends of the spiral roller 13 are pressed by the tapered roller bearings 15, which can rotate circumferentially through the central liquid flow.

[0088] Embodiment 10

[0089] In this embodiment, the cylinder 12 is provided with a step, one end of the spiral roller 13 abuts against the step and the other end of the tapered roller bearing 15, and the other end of the tapered roller bearing 15 abuts against the other end of the spiral roller 13 and the head 16.

[0090] The two tapered roller bearings 15 and the spiral roller 13 are directly placed in the cylinder 12 and sealed by the head 16, which is convenient to disassemble and saves time and effort.

[0091] Preferably, the head 16 is a cylindrical structure with both ends open, which is located in one end of the cylinder 12 and is threadedly connected with one end of the cylinder 12.

[0092] When working, the spiral roller 13 rotates circumferentially under the radial force generated by the internal medium, the contact end of the tapered roller bearing 15 and the spiral roller 13 rotate together, and the other end is stationary, and the cylinder 12 and the head 16 are stationary under pressure.

[0093] The working principle of the present application is as follows:

[0094] During use, the whole device is placed horizontally or at a certain angle with the horizontal plane, liquid + sand enters the cyclone nipple 2, the cyclone nipple 2 performs preliminary stirring of the sand; then, the shunt pipe 6 in the shunt nipple 3 is extended to the center of the spray gun, the sand is stirred again, so that the sand is uniformly sprayed from the multiple spray holes on the spray gun, improving the uniformity of the single-stage spray gun circumferential perforation and fracturing particles, and also reducing the particle non-uniformity between multiple spray guns.

[0095] The specific implementation process of the present application on site is as follows:

[0096] 1, on-site placement

[0097] Place the equipment, facilities and tools on site, and complete the connection of the facilities and ground process. Lay three-proofing cloth under the coiled tubing equipment, the outlet facilities, the tool and the pump injection equipment. Lay three-proofing cloth around the wellhead. One side of the three-proofing cloth is fixed to the ground, and the other side is strictly prohibited from being used alternately.

[0098] 2, pump injection inlet, wellhead to external discharge control valve pressure test

[0099] (1) use ρ: 1.01 g / cm 3 The return flow of the continuous discharge tank is tested at 35 MPa on the external discharge control pipeline. According to the three values of 10% (3.5 MPa), 50% (17.5 MPa) and 100% (35 MPa) of 35 MPa, the test is carried out step by step, the pressure drop is ≤0.7 MPa for 10 minutes, and the sealing part is not permeable and leakproof.

[0100] (2) use ρ: 1.01 g / cm 3 The return flow of the continuous discharge tank is tested at 50 MPa on the external discharge control pipeline. According to the three values of 10% (5 MPa), 50% (25 MPa) and 100% (50 MPa) of 50 MPa, the test is carried out step by step, the pressure drop is ≤0.7 MPa for 10 minutes, and the sealing part is not permeable and leakproof.

[0101] 3, blowout preventer test, liquid filling

[0102] (1) Blowout preventer test: the coiled tubing blowout preventer and support are hoisted to the ground by the crane, the blowout preventer hydraulic pipeline is connected in turn, the four gate valves of the blowout preventer are opened and closed, and the blowout preventer gate valve is confirmed to be in normal working condition.

[0103] (2) Install the blowout preventer and connect it with the wellhead flange and tighten it.

[0104] (3) Connect the pump truck to the coiled tubing truck inlet, start the pump at 200-300 L / min, and fill the liquid into the coiled tubing until the outlet is clean, then stop the pump.

[0105] 4. Connect the downhole tool string and test

[0106] (1) The crane lifts the injection head to the end of the coiled tubing and the wellhead.

[0107] (2) The crane lifts the injection head, connects the blowout preventer in turn, extends the coiled tubing from the bottom of the blowout preventer, connects the tool string under the coiled tubing connector, measures the length of the tool string after each connection, and recovers the corresponding length of coiled tubing into the blowout pipe, and the tool string end is exposed.

[0108] 5. Wellhead connection, pressure test and standardization

[0109] (1) Wellhead connection: the crane lifts the injection head, blowout preventer and downhole tool to the wellhead, and connects with the wellhead. The coiled tubing passes through the tool string, from top to bottom: Ф73mm rivet connector x 0.20m + Ф73mm double flap check valve x 0.32m + Ф73mm hydraulic release x 0.44m + Ф73mm jar x 1.73m + Ф73mm screw motor x 4.25m + Ф105mm grinding shoe x 0.37m.

[0110] (2) The coiled tubing depth and pressure sensors are calibrated to zero, the blowout preventer clamping force is increased, the water is treated with ρ: 1.0g / cm3, the pump is started <200L / min, the coiled tubing and well control device are pressure tested to 50MPa, and the test is carried out in three steps according to 10% (5MPa), 50% (25MPa) and 100% (50MPa) of 50MPa, each for 10min, the pressure drop is ≤0.7MPa, and the sealing part is not punctured or leaked. After pressure relief, the coiled tubing well control device is tested to 25MPa, and then the pressure in the coiled tubing is relieved to 0MPa. The motor head assembly check valve is pressure tested to 25MPa, and the pressure drop is ≤0.7MPa for 10min.

[0111] (3) Complete the ground standardization according to the well site layout.

[0112] ① Adjust the chain clamping force of the injection head and the blowout preventer clamping force.

[0113] ② Lower and raise the coiled tubing by 1m, and perform the zeroing of the suspended weight sensor.

[0114] ③ After lowering the coiled tubing to 3070m to the bottom of the artificial well, raise the tubing 5m and flush at a fixed point for 1.5 rotations. Slowly raise the coiled tubing to the wellhead. Control the speed to within 15m / min. When the end of the coiled tubing is 50m from the wellhead, stop the pump and shut off the backflow. The raising speed of the coiled tubing should be reduced to 5m / min. When the end of the coiled tubing is 20m from the wellhead, the raising speed of the coiled tubing should be reduced to below 2.5m / min. Raise the coiled tubing joint to the blowout preventer (BOP). Test close the No. 2 gate valve to ensure that the downhole tool string has been raised into the BOP. Record the number of rotations. Slowly release the pressure inside the BOP. Disassemble the wellbore cleaning tool string and replace the first perforation tool string.

[0115] 6. First section of perforation

[0116] (1) Connect the perforation tool string of the first section of the coiled tubing, from top to bottom as follows: Ф73mm rivet connector × 0.20m + Ф73mm double valve single flow valve × 0.32m + Ф73mm hydraulic release × 0.44m + perforation tool.

[0117] (2) Open the wellhead main valve, calibrate the depth counter, and run in the coiled tubing.

[0118] (3) Open the wellhead and run back to the well. Slowly lower the coiled tubing. When the coiled tubing passes the blowout preventer and the fracturing wellhead, the speed should not exceed 5 m / min. Try lowering it for 50 m and observe the operation of the equipment. After it is normal, the speed should be kept below 20 m / min. After entering 3306 m, the speed should be controlled below 10 m / min.

[0119] (4) After the coiled tubing is lowered to 3067m, pressure perforation is performed.

[0120] (5) Raise the coiled tubing to the wellhead at a speed of less than 15 m / min. When the end of the coiled tubing is 50 m from the wellhead, the raising speed should be reduced to 5 m / min; when the end of the coiled tubing is 20 m from the wellhead, the raising speed should be reduced to less than 2.5 m / min. Extend the coiled tubing joint to the blowout preventer (BOP), and test close gate valve #2 to ensure the downhole tool string has been raised into the BOP. Record the number of turns, slowly release the pressure inside the BOP, and retrieve the tool.

[0121] (6) After the tool is pulled out of the wellhead to check the perforation rate, the wellhead is disassembled.

[0122] 7. Dismantling and relocation

[0123] (1) Recover the ground pipelines and auxiliary tools, load the equipment and tools onto the vehicle for inspection, and evacuate the well site after confirming that everything is normal.

[0124] (2) The contracting party shall proceed with the next stage of construction.

[0125] The application aims to design a cyclone sub and a flow distribution sub, which are used in the multi-stage integrated hydraulic jet perforation and fracturing process of horizontal wells or high-deviation wells, improve the non-uniformity of single-stage jet gun circumferential perforation and fracturing particles, and also reduce the non-uniformity of particles between multiple jet guns.

[0126] The application can be used in the integrated pipe string hydraulic jet perforation and fracturing process of the coiled tubing multi-stage jet gun, can effectively reduce the non-uniformity of single-stage jet gun different perforation particle concentration and the particle concentration difference between two-stage jet guns, and has the characteristics of simple structure, long service life and easy installation.

[0127] During use, the device can disperse the particles in the liquid, so that the particles are more uniformly distributed along the pipe cross section. When the device is not used, the particles are easy to settle; after the cyclone structure is used, the particles are more dispersed.

[0128] Since the cyclone sub and the flow distribution sub are made of high-hardness 9Cr18MoV stainless steel (hardness >= 58HRC), the damage caused by particle erosion and corrosion can be reduced. The spiral grooves in the cyclone interior and the flow distribution pipe exterior can effectively rotate the liquid and particles to achieve the purpose of dispersing particles.

[0129] It should be noted that all electronic components involved in the application use existing technologies, and the above-mentioned components are electrically connected to the controller. The control circuit between the controller and each component is of the prior art.

[0130] It is obvious to those skilled in the art that the application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0131] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

[0132] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A novel continuous tubing spray gun device, characterized in that: It includes a water jet gun (1), a swirl section (2) and a flow divider section (3). The water jet gun (1) is provided with a plurality of spray holes (4) at even intervals. One end of the swirl section (2) is connected to one end of the water jet gun (1), and the other end is used to connect to an oil pipe. The flow divider section (3) is connected to the other end of the water jet gun (1), and one end of it extends into the water jet gun (1).

2. The novel continuous tubing spray gun device according to claim 1, characterized in that: The diversion section (3) includes a section body (5), a diversion pipe (6), and a motor (7). One end of the section body (5) is connected to the other end of the water jet gun (1). The diversion pipe (6) is coaxially installed inside the section body (5), and one end of it passes through one end of the section body (5) and the other end of the water jet gun (1) and extends into the water jet gun (1). The motor (7) is installed inside the section body (5), and its driving end is connected to the other end of the diversion pipe (6) for driving the diversion pipe (6) to rotate.

3. The novel continuous tubing spray gun device according to claim 2, characterized in that: A plug (8) is installed at the other end of the short section body (5), and the plug (8) abuts against the motor (7).

4. The novel continuous tubing spray gun device according to claim 2, characterized in that: The driving end of the motor (7) is connected to one end of the connecting shaft (9), and the other end of the shunt pipe (6) is connected to the other end of the connecting shaft (9) through multiple cylindrical keys (10).

5. The novel continuous tubing spray gun device according to claim 4, characterized in that: The short section body (5) is also equipped with a deep groove ball bearing assembly and a top ring (11). The deep groove ball bearing assembly is rotatably sleeved outside the connecting shaft (9). The top ring (11) is rotatably sleeved outside the connecting shaft (9), and its two ends abut against the other end of the deep groove ball bearing assembly and the diverter pipe (6), respectively.

6. The novel continuous tubing spray gun device according to any one of claims 1-5, characterized in that: The swirl section (2) includes a cylinder (12) and a spiral drum (13). The cylinder (12) is hollow inside and open at both ends. One end of the cylinder is connected to one end of the water jet gun (1), and the other end is used to connect to the oil pipe. The spiral drum (13) is coaxially mounted inside the cylinder (12). It is hollow inside and open at both ends, and its inner wall is machined with spiral grooves.

7. The novel continuous tubing spray gun device according to claim 6, characterized in that: The spiral groove group includes multiple spiral grooves (14), which are spirally distributed on the inner wall of the spiral roller (13).

8. The novel continuous tubing spray gun device according to claim 7, characterized in that: The depths of the plurality of spiral grooves (14) are 5-20 mm, and the two ends of the plurality of spiral grooves (14) are respectively chamfered at 30-60°.

9. The novel continuous tubing spray gun device according to claim 6, characterized in that: Tapered roller bearings (15) are installed inside the cylinder (12) at the locations corresponding to both ends of the spiral roller (13).

10. The novel continuous tubing spray gun device according to claim 9, characterized in that: The cylinder (12) has a step inside, and the two ends of one of the tapered roller bearings (15) abut against the step and one end of the spiral roller (13), respectively; a head (16) is installed at one end of the cylinder (12), and the two ends of the other tapered roller bearing (15) abut against the other end of the spiral roller (13) and the head (16), respectively.

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