Unblocking tool for unblocked rotation of oil pipe and using method of unblocking tool

Abstract

The invention discloses an oil pipe rotating unblocking and unblocking tool and a using method thereof. One end of a centralizing short section set is connected with a halter, and the other end of the centralizing short section set is connected with a spiral paraffin scraping drill bit. A mounting hole is formed in the end part of the centralizer shell, and a cable plug and a gear motor are arranged in the mounting hole; the cable plug is connected with the inner wall of the centralizer shell by being sleeved with the hydraulic bearing, and the cable plug is connected with the end of the gear motor. The cable plug in the next centralizing short section can drive the gear motor and the lead screw of the gear motor to rotate together, power is transmitted to the spiral paraffin scraping drill bit of the centralizing short section at the tail end step by step, and stronger power is provided. In the rotating process, it can be guaranteed that the centralizer shell does not rotate. Friction between the centralizer shell and the hole wall can be reduced, electric energy is saved, meanwhile, a cable connected with a cable plug can be prevented from rotating, and a cable core is prevented from being damaged due to excessive rotation.

Description

Technical Field

[0001] The invention belongs to the technical field of oil well wellbore, and in particular relates to an oil pipe rotating unblocking tool and a use method thereof. Background Art

[0002] At present, some oilfield wells have serious blockages, with more than 30 wells being treated each year. There are three main post-blockage treatment processes for wellbore blockage: positive agent thin oil, asphalt dispersant immersion, and continuous tubing unblocking. The latter two processes have better effects, but are restricted by construction cost factors and have not been implemented on a large scale. There are two main types of blockage components. One is the wellbore wax blockage caused by high wax content in crude oil, generally in the wellbore 2000m and above; the other is the asphaltene precipitation blockage caused by the heavy components left after the extraction after gas injection and the asphaltene blockage caused by the original asphaltene production in the carbonate formation. Wax blockage can generally be solved by scraping wax, but asphaltene precipitation is more troublesome to handle due to the uncertain blockage location and lack of regularity. Most wells have a long treatment cycle and high cost.

[0003] The patent publication number is CN208605150U, and the name is a patent application for an electric well-drilling instrument for water injection wells in oil fields. A wire-passing weighted short section is connected below the cable connector, and a motor protective tube is connected below the wire-passing weighted short section, and a driving motor is installed in the inner cavity of the motor protective tube; a straightening short section is connected to the lower end of the motor protective tube, a straightener is installed on the outer periphery of the straightening short section, and a transmission shaft is installed in the inner cavity; a locking short section is connected to the lower end of the straightening short section, a locking mechanism is installed on the outer periphery of the locking short section, and a driving shaft is installed in the inner cavity; the lower end of the driving motor is connected to the transmission shaft, and the lower end of the transmission shaft is fixed in the upper end countersunk hole of the driving shaft; an unlocking spring is supported below the locking short section, and the lower end of the unlocking spring is supported on the driving shaft boss, and the driving shaft boss is supported in the bearing seat through a bearing, and the lower end of the driving shaft extends from the center of the lower end cover of the bearing seat and is screwed into the upper end screw hole of the cutter rod, and the lower end of the cutter rod is connected to a cutter head. Although the device of this patent application can also rotate to clear blockage, the power of this patent application is single and cannot solve stubborn blockages. It is also difficult to ensure that the outer shell does not rotate. It is inconvenient to install cables during use. The function of some short sections is to keep the outer shell from rotating by adding weight, which will generate unnecessary power consumption. Summary of the invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a tubing rotary unblocking tool and a method of using the tool, which can not only prevent the outer shell from rotating but also provide greater power by connecting multiple straightening nipples in series, thereby solving the problems of unclean unblocking and lack of access in the wellbore unblocking process, and achieving the purpose of repeatedly cutting wax blocks and asphaltene on the inner wall of the tubing by repeatedly lifting and lowering the tool string, thereby ensuring that the wellbore is clean.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A tool for rotating and unblocking an oil pipe, comprising:

[0007] A faucet having a through hole therein;

[0008] A straightening nipple assembly, one end of which is connected to the faucet, and the other end of which is connected to a spiral wax scraping drill bit;

[0009] Wherein, the straightening pup section group includes a plurality of straightening pup sections, and the straightening pup section includes a straightening device housing, and a mounting hole is provided at the end of the straightening device housing, and a cable plug and a reduction motor are provided in the mounting hole; the cable plug is externally connected to the inner wall of the straightening device housing through a sleeve hydraulic bearing, and the cable plug is connected to the end of the reduction motor, and the reduction motor is rollingly connected to the inner wall of the straightening device housing; a screw rod is provided at the output end of the reduction motor; in the straightening pup section group, the straightening pup section whose one end is connected to the spiral wax scraping drill bit is connected to the spiral wax scraping drill bit through the screw rod; the plurality of straightening pup sections are externally fixedly connected through the straightening device housing, and internally connected to the hydraulic bearing of the cable plug on another straightening pup section through the screw rod of one straightening pup section.

[0010] Optionally, a slide groove is provided in the straightening short section, a slider is provided in the slide groove, the slider is connected to an arm group, the arm group includes two oppositely arranged arms, and an extension groove is provided on the side of the straightening short section, and the arm extends from the extension groove.

[0011] Optionally, a roller is provided at the end of the support arm.

[0012] Optionally, a connecting shaft is provided on the slider, a slot is provided on the support arm, and the support arm is rotatably connected to the connecting shaft of the slider via the slot; a fixed shaft is provided on the housing of the stabilizer, and the support arm is rotatably connected to the fixed shaft.

[0013] Optionally, the number of arm groups of a same righting sub is greater than one.

[0014] Optionally, the screw rod outer sleeve is provided with a bearing, and the bearing is fixed in the inner wall of the stabilizer housing.

[0015] Optionally, the bearing is a one-way thrust ball bearing, and the cable plug is an aviation plug.

[0016] Optionally, a nut is provided on the inner wall of the end of the centralizer housing, and the two centralizer housings are connected via the nut.

[0017] Optionally, the faucet and the righting nipple assembly are connected via a rotating nipple.

[0018] A method for using an oil pipe rotating unblocking tool comprises the following steps:

[0019] Pass the cable through the through hole of the faucet and connect it to the cable plugs of all the righting nipples in the righting nipple group respectively;

[0020] Lowering the oil pipe rotation unblocking tool;

[0021] All reduction motors are turned on, and the positions are adjusted by the straightening short sections, and the power is transmitted to the spiral wax scraping drill bit through multiple straightening short sections to remove the blockage.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention discloses a tool for rotating and unblocking oil pipes. The tool is connected to each other through a plurality of straightening short sections. The screw of the straightening short section is connected to the hydraulic bearing outside the cable plug of another straightening short section. The cable plug in the next straightening short section can drive the reduction motor and the screw of the reduction motor to rotate together, and transmit the power step by step to the spiral wax scraping drill bit of the terminal straightening short section. During the rotation process, the housing of the straightening device can be ensured not to rotate. The friction between the housing of the straightening device and the hole wall can be reduced, and electric energy can be saved. At the same time, the cable connected to the cable plug can be prevented from rotating, and the cable core can be prevented from being damaged due to excessive rotation. The present invention changes the traditional ground power transmission process, provides power to the downhole motor through the ground cable, and directly provides source power to the power motor in the target layer, so that energy consumption can be reduced to the maximum extent, and stronger power can be provided through the straightening short section. After the reduction motor is powered on, it drives the spiral wax scraping drill bit to rotate, so as to achieve the purpose of rotating the asphaltene and hard wax blocks on the inner wall of the oil pipe in the target layer. The oil pipe rotary unblocking tool of the present invention does not require large equipment for auxiliary operation, has lower cost, and can move up and down multiple times as needed to thoroughly clean the wellbore, providing a clean wellbore environment for subsequent well testing and logging. Compared with the current traditional chemical unblocking and continuous oil pipe unblocking technology, it has the advantages of wider application range, lower cost and better treatment effect.

[0024] Furthermore, the present invention aims at the centering problem of the oil pipe rotating unblocking tool, and uses the support arm of the righting pup joint to assist the downhole tool in centering with the righting pup joint.

[0025] Furthermore, the end of the support arm of the present invention is provided with a roller, which can better contact with the well wall in the oil well and avoid rapid wear of the support arm after multiple collisions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0027] Figure 1 It is a schematic diagram of the overall device of the present invention;

[0028] Figure 2 It is a cross-sectional schematic diagram of the overall device of the present invention;

[0029] Figure 3 It is a schematic diagram of the righting pup joint of the present invention;

[0030] Figure 4 It is a three-dimensional schematic diagram of the righting pup joint of the present invention;

[0031] Figure 5 A schematic diagram of a spiral wax scraping drill bit of the present invention;

[0032] Figure 6 It is a three-dimensional schematic diagram of the spiral wax scraping drill bit of the present invention;

[0033] Figure 7 It is a cross-sectional schematic diagram of the spiral wax scraping drill bit of the present invention;

[0034] Among them, 1. Malvern head; 2. Rotating short section; 3. Righting short section; 301. First righting short section; 302. Second righting short section; 303. Third righting short section; 4. Spiral wax scraping drill bit; 31. Righting device housing; 32. Cable plug; 33. Speed ​​reduction motor; 34. Screw rod; 35. Bearing; 36. Nut; 37. Slider; 38. Roller; 39. Support arm. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] The present invention is described in detail below with reference to the accompanying drawings.

[0039] like Figures 1 to 7 As shown, a tubing rotary unblocking and unblocking tool of the present invention comprises: a faucet 1, a rotary nipple 2, a straightening nipple assembly and a spiral wax scraping drill bit 4.

[0040] The faucet 1 is provided with a through hole for passing a cable, one end of the faucet 1 through which the cable passes is connected to the rotating nipple 2, the other end of the rotating nipple 2 is connected to the straightening nipple group, and the other end of the straightening nipple group is connected to the spiral wax scraping drill bit 4. Specifically, the faucet 1, the rotating nipple 2, the straightening nipple group and the spiral wax scraping drill bit 4 are all made of alloy steel.

[0041] The straightening pup joint group includes a plurality of straightening pup joints 3 , and the straightening pup joint 3 includes: a straightening device housing 31 , a cable plug 32 , a reduction motor 33 , a screw rod 34 , a one-way thrust ball bearing 35 , a nut 36 , a slider 37 and a support arm 39 .

[0042] The end of the centralizer housing 31 is provided with a mounting hole, and the cable plug 32 and the reduction motor 33 are both arranged in the mounting hole. The cable plug 32 is connected to the inner wall of the centralizer housing 31 by sleeve-arranging a hydraulic bearing. The outer ring of the hydraulic bearing is fixedly connected to the inner wall of the centralizer housing 31, and the inner ring is connected to the cable plug 32. The reduction motor 33 is rollingly connected to the inner wall of the centralizer housing 31. One end of the cable plug 32 is used to connect with the cable, and the other end is connected to the end of the reduction motor 33, and the cable plug 32 is electrically connected to the reduction motor 33. The other end of the reduction motor 33 is connected to the screw rod 34, and both ends of the screw rod 34 have annular steps, and both ends of the screw rod 34 are sleeved with bearings 35. The bearing 35 is connected to the inner wall of the centralizer housing 31, and the screw rod 34 can rotate in the bearing 35.

[0043] Optionally, the cable plug is an aviation plug, and the bearing 35 is a one-way thrust ball bearing.

[0044] In the straightening pup section group, the straightening pup section 3 connected to the spiral wax scraping drill bit 4 at one end is connected to the spiral wax scraping drill bit 4 through the screw rod 34; the plurality of straightening pup sections 3 are fixedly connected externally through the straightening device housing 31, and internally connected to the inner ring of the hydraulic bearing of the cable plug 32 on another straightening pup section 3 through the screw rod 34 of one straightening pup section 3.

[0045] Specifically, Figure 1 , Figure 2 As shown, the straightening pup section group includes a first straightening pup section 301, one end of the first straightening pup section 301 is connected to the rotating pup section 2, and the other end is connected to the second straightening pup section 302 through a screw rod 34, and the other end of the second straightening pup section 302 is connected to the third straightening pup section 303 through a screw rod 34, and the screw rod 34 of the third straightening pup section 303 is connected to the spiral wax scraping drill bit 4.

[0046] A nut 36 is disposed on the inner wall of the end of the centralizer housing 31 , and the two centralizer housings 31 are connected via the nut 36 .

[0047] A slide groove is provided in the straightening subsection 3, a slider 37 is provided in the slide groove, and an arm group is connected to the slider 37. The arm group includes two oppositely arranged arms 39, and rollers 38 are provided at the ends of the arms 39. The two oppositely arranged arms 39 are spread out in a V shape. Multiple arm groups are provided on the same straightening subsection 3, and the multiple arm groups are arranged along the axial direction of the straightening subsection 3. Between two adjacent arm groups on the same straightening subsection 3, the planes connected by the two arms 39 of the arm group are perpendicular to each other.

[0048] The side of the straightening sub 3 is provided with an extension slot, and the support arm 39 extends from the extension slot. The support arm of the straightening sub 3 can automatically open when the straightening sub 3 rotates, and the support arm can automatically retract into the extension slot when the straightening sub 3 stops rotating.

[0049] The slider 37 is provided with a connecting shaft, and the arm 39 is provided with a slot, and the arm 39 is rotatably connected to the connecting shaft of the slider 37 through the slot; the centralizer housing 31 is provided with a fixed shaft, and the arm 39 is rotatably connected to the fixed shaft. Specifically, the axial directions of the fixed shaft and the connecting shaft are perpendicular to the axial direction of the centralizing sub 3. When the centralizing sub 3 contacts the external borehole wall, the arm 39 shrinks inward, and the sliding of the slider 37 in the slide groove slows down the shrinking speed, so that the centralizing sub 3 will not deviate.

[0050] A method for using a tubing rotary unblocking tool of the present invention comprises the following steps: passing a cable through a through hole of a faucet 1 and connecting the cable plugs 32 of all the righting nipples 3 in the righting nipple group respectively;

[0051] Lower the oil pipe rotation unblocking and unblocking tool, and adjust the position of the support arm of the straightening sub 3 so that the oil pipe rotation unblocking and unblocking tool is centered;

[0052] All the reduction motors 33 are turned on, and the power is transmitted step by step to the spiral wax scraping drill bit 4 through a plurality of straightening short sections 3, and the blockage is removed by the rotation of the spiral wax scraping drill bit 4.

[0053] Example

[0054] The oil pipe rotary unblocking tool of the present invention is used to connect the rotary head 43 with the screw rod of a straightening short section 3 before drilling. After the plurality of straightening short sections 3 are connected, they are fastened by threads.

[0055] The cone of the horse faucet 1 is connected to a steel cable. The main function of the cable is to lift and lower the entire device and connect the wires inside the cable to the ground power supply equipment to supply power at the obstructed part, so that the tool can rotate.

[0056] After the ground connection is completed, the cable is connected to the drum on the logging vehicle and the whole is placed in the nozzle.

[0057] The sprinkler prevention equipment is lifted by a crane and connected to the Christmas tree on the ground. After the connection is successful, the test valve on the top of the Christmas tree is opened and the tool is lowered into the wellbore by a roller;

[0058] The tension of the instrument can be observed through the control panel on the well testing vehicle. Under normal circumstances, the tension is equal to the weight of the instrument minus the buoyancy. If there is resistance, the tension will drop rapidly, that is, the change in ground tension can be used to know whether the instrument is blocked in the wellbore. Once a blockage is found, the ground power supply can be connected through a cable. At this time, the downhole faucet starts to rotate, but the centralizer housing 31 does not rotate. The reduction motor 33 can reduce the rotation speed. This speed and power can be fully transmitted to the rotating head 43 for cutting asphalt or hard wax blocks.

[0059] Compared with the abnormal mechanical wax removal and asphalt dispersant soaking effects of the current conventional treatment, the present invention can clean the wax blockage and asphalt blockage section by section through one construction, greatly improving the treatment efficiency; secondly, the present invention is mainly effective for wells with serious wellbore blockage. The present invention takes about 10 hours to treat a well. Compared with the asphalt dispersant and wax melting agent treatment, that is, 5 hours of drug application time plus 24 hours of well soaking time and 6 hours of subsequent treatment time, the present invention can save at least 20 hours.

[0060] Unless otherwise specified, the device elements involved in the above embodiments are all conventional device elements, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A tool for rotating and unblocking oil pipes, characterized in that: include: A faucet (1), wherein a through hole is provided in the faucet (1); A straightening nipple assembly, one end of which is connected to the faucet (1) and the other end of which is connected to a spiral wax scraping drill bit (4); The straightening pup joint group comprises a plurality of straightening pup joints (3), the straightening pup joint (3) comprises a straightening device housing (31), an end of the straightening device housing (31) is provided with a mounting hole, a cable plug (32) and a reduction motor (33) are provided in the mounting hole; the cable plug (32) is connected to the inner wall of the straightening device housing (31) through a sleeve hydraulic bearing, the cable plug (32) is connected to the end of the reduction motor (33), and the reduction motor (33) is connected to the straightening device housing (31). 1); the output end of the reduction motor (33) is provided with a screw (34); in the straightening pup section group, the straightening pup section (3) whose one end is connected to the spiral wax scraping drill bit (4) is connected to the spiral wax scraping drill bit (4) through the screw (34); the plurality of straightening pup sections (3) are fixedly connected externally through the straightening device housing (31), and are internally connected to the hydraulic bearing of the cable plug (32) on another straightening pup section (3) through the screw (34) of one straightening pup section (3).

2. The oil pipe rotary unblocking tool according to claim 1, characterized in that: A slide groove is arranged in the straightening short section (3), a slider (37) is arranged in the slide groove, the slider (37) is connected to an arm group, the arm group includes two oppositely arranged arms (39), a side surface of the straightening short section (3) is provided with an extension groove, and the arm (39) extends out from the extension groove.

3. The oil pipe rotary unblocking tool according to claim 2, characterized in that: A roller (38) is provided at the end of the support arm (39).

4. The oil pipe rotary unblocking tool according to claim 2, characterized in that: The slider (37) is provided with a connecting shaft, the support arm (39) is provided with a slot, and the support arm (39) is rotatably connected to the connecting shaft of the slider (37) via the slot; the centralizer housing (31) is provided with a fixed shaft, and the support arm (39) is rotatably connected to the fixed shaft.

5. The oil pipe rotary unblocking tool according to claim 2, characterized in that: The number of arm groups of the same righting sub is greater than one.

6. The oil pipe rotary unblocking tool according to claim 1, characterized in that: The outer sleeve of the screw rod (34) is provided with a bearing (35), and the bearing (35) is fixed in the inner wall of the centralizer housing (31).

7. The oil pipe rotary unblocking tool according to claim 6, characterized in that: The bearing (35) is a one-way thrust ball bearing, and the cable plug (32) is an aviation plug.

8. The oil pipe rotary unblocking tool according to claim 1, characterized in that: A nut (36) is provided on the inner wall of the end of the centralizer housing (31), and the two centralizer housings (31) are connected via the nut (36).

9. The oil pipe rotary unblocking tool according to claim 1, characterized in that: The faucet (1) is connected to the righting nipple assembly via a rotating nipple (2).

10. A method for using a tubing rotary unblocking tool according to any one of claims 1 to 9, characterized in that: The following steps are involved: Passing the cable through the through hole of the faucet (1) and connecting it to the cable plugs (32) of all the righting pup joints (3) in the righting pup joint group; Lowering the oil pipe rotation unblocking tool; All the reduction motors (33) are turned on, and the positions are adjusted by the straightening short sections (3), so that the power is transmitted to the spiral wax scraping drill bit (4) through the plurality of straightening short sections (3).

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