CN111441746B

CN111441746B - Drill rod mud scraper for quick tripping under complex well conditions and mud scraping method thereof

Info

Publication number: CN111441746B
Application number: CN202010271410.5A
Authority: CN
Inventors: 熊勇; 熊朝柱
Original assignee: Qingdao Zhongruiweifei Marine Equipment Manufacturing Co Ltd
Current assignee: Qingdao zhongruiweifei Marine Equipment Manufacturing Co., Ltd
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2021-04-16
Anticipated expiration: 2040-04-09
Also published as: CN111441746A

Abstract

The invention discloses a drill rod mud scraper for quick tripping under complex well conditions and a mud scraping method thereof, wherein the drill rod mud scraper comprises a fastener detachably connected to a drill floor fixing device, an installation part for installing a mud scraping ring, and an elastic part connected between the fastener and the installation part; the mud scraping ring is of an unclosed annular structure, two ends of the mud scraping ring are respectively a fixed end and a movable end, the fixed end is fixedly connected to the mounting piece, and the movable end is detachably connected to the mounting piece; when no external force acts, the inner diameter of the mud scraping ring is smaller than the outer diameter of the rod body of the drill rod to be scraped. The invention aims to provide a drill rod mud scraper for quick tripping under complex well conditions and a mud scraping method thereof, so as to solve the problem that in the prior art, no mud scraping mode which does not need to disassemble and assemble a loading disc and supplement a core and does not consume the manpower of a driller is not available during quick tripping or short tripping operation, and achieve the purposes of improving the underground safety and reducing the manpower consumption for tripping.

Description

Drill rod mud scraper for quick tripping under complex well conditions and mud scraping method thereof

Technical Field

The invention relates to the field of oil and gas development, in particular to a drill rod mud scraper for quick tripping under complex well conditions and a mud scraping method thereof.

Background

The drill rod mud scraper is used in the field of petroleum and natural gas drilling and used for scraping drilling fluid attached to the outer wall of a drill rod in the drilling process, and the phenomenon that the drill rod stand column is splashed by the drilling fluid on a drill floor to cause the drill floor to be excessively dirty is avoided. The drill floor wellhead is provided with a rotary table and a matched core-supplementing device, the traditional drill rod mud scraper is generally matched with the rotary table core-supplementing device for use, when mud is required to be scraped, the core-supplementing device is taken out by a crane or a pneumatic winch firstly, then the matched mud scraper is put in, and then the core-supplementing device is installed again for carrying out the drill-tripping operation. After the drill is taken out, the supplement core needs to be taken out again to take out the mud scraper, and then the supplement core needs to be installed again. The traditional mud scraper has the following two disadvantages: (1) when the well condition is poor, the downhole condition is complex and the rapid drilling is required, the time consumption for installing the mud scraper is long, the standing time of a drilling tool in the well is long, the blocking phenomenon is easily induced, and even the drilling blocking accident is caused in serious conditions; (2) the drilling construction of long distance well section generally all can have a plurality of times short trip drilling operation, and short trip length is shorter, and the special installation scraper needs twice dismouting carousel benefit core, and inefficiency influences the time limit for a project. Therefore, in the prior art, when the above-mentioned tripping situation is encountered, a general drilling engineer does not install a mud scraper but adopts manual mud scraping from the aspects of safety and effectiveness. The manual mud scraping is that two drillers are respectively positioned at two opposite sides of a well mouth, one person holds a mud scraping rod, and the mud scraping rod is formed by connecting two wooden rods by a cloth strip or an adhesive tape; the cloth strips or the rubber strips are kept in contact with the outer wall of the drill rod in the process of pulling out the drill, one driller basically controls the circumferential 180-degree range of the outer wall of the drill rod, and therefore two drillers are required to be matched to complete the mud scraping operation on the outer wall of the whole drill rod. As is known, in the process of tripping, the two wellhead drillers need to continuously perform operations such as slip setting, large tong driving, slip lifting and the like, the labor intensity is very high, once mud scraping operation is performed, the whole tripping process is completely free of rest time, and the manpower consumption is very high.

Also external automatic scrapers have appeared in the prior art, i.e. scrapers which are not temporarily built into the rotating disc, such as CN 202544813U. The technology realizes automatic mud scraping by adsorbing the powerful magnet feet above the turntable. However, such prior art techniques are not at all suitable for rapid tripping in complex well conditions for at least: (1) because the two tool bodies are attracted on the upper surface of the rotary table through magnetism, coat the drill rod and occupy the position of a wellhead, the tool cannot seat the drill rod slips which are necessary for tripping each column of drill rods as well known, otherwise, tripping operation cannot be realized at all. Thus, such prior art techniques require that each trip of a drill string require both tool bodies to be removed, the wellhead position to be vacated, the slips to be set, and subsequent tripping operations to be performed. Then, the two tool bodies need to be covered outside the wellhead drill rod again after the next column of the drill rod is advanced. This has the result that each time a drill rod is to be removed, the worker has to perform the operations of unlatching, removing, resetting and closing the latches of the two tool bodies at a time. Taking a shallow well with the well depth of 2000m as an example, the drill rod needs to use 70 columns, that is, the operations are increased by more than 70 times, and further, oil and gas fields represented by Sichuan and Xinjiang in the western part of China are generally drilled in deep wells with the depth of more than 5000 m. The addition of such many operation steps inevitably causes great interference on the tripping speed, greatly increases the time consumption for disassembling each column drill rod, greatly increases the static time of the drilling tool in the well, and has serious underground potential safety hazard. (2) Two instrument bodies all stabilize on the carousel through balancing weight and powerful magnet foot, and the driller all need overcome the gravity of balancing weight and the magnetic force of powerful magnet foot to the carousel face through the manpower when removing it from the well head before the seat slips at every turn, not only can not alleviate work load, is showing on the contrary and has increased the manpower consumption. (3) In addition, although the powerful magnet feet can generate magnetic adsorption force on the rotary table, it is known that, in a common downhole drilling tool, except for non-magnetic drill collars used before and after a inclinometer (MWD), all the other downhole drilling tools such as a drill pipe, a drill collar, a centralizer and the like are made of ferrous materials, that is, for a drilling tool moving many kilometers, generally only dozens of meters of non-magnetic materials exist in a bottom drilling tool assembly (BHA), and all the other drilling tools are made of materials subject to magnetic adsorption, so that in the prior art, through an operation mode of the strongly-magnetic wellhead rotary table, interference resistance is inevitably applied to the taken out drilling tool, which not only increases the load of a drilling winch without end, accelerates the abrasion of a drilling rope, improves the slippage and cutting frequency of the drilling rope, but also causes the hook load in the drilling process to increase without end, and the hook load is the most main index for judging the drilling condition in the drilling process, once the load of the hook is distorted and the driller is easy to have judgment errors, the engineering accident is also caused when the judgment errors are serious.

In summary, in the face of various complex well conditions such as drilling sticking, well leakage, overflow well kick, drilling tripping, drilling resistance, insufficient stability of well wall, too thick mud cake, or big belly well section, key slot or step in well, no proper automatic mud scraping equipment in the prior art can replace manual operation.

Disclosure of Invention

The invention aims to provide a drill rod mud scraper for quick tripping under complex well conditions and a mud scraping method thereof, so as to solve the problem that no proper automatic mud scraping equipment can replace manual operation when quick tripping under complex well conditions in the prior art, and achieve the purposes of improving the underground safety and reducing the manpower consumption for tripping.

The invention is realized by the following technical scheme:

the drill rod mud scraper for quick tripping under complex well conditions comprises a fastener detachably connected to a drilling platform fixing device, an installation piece for installing a mud scraping ring and an elastic piece connected between the fastener and the installation piece; the mud scraping ring is of an unclosed annular structure, two ends of the mud scraping ring are respectively a fixed end and a movable end, the fixed end is fixedly connected to the mounting piece, and the movable end is detachably connected to the mounting piece; when no external force acts, the inner diameter of the mud scraping ring is smaller than the outer diameter of the rod body of the drill rod to be scraped.

The complex well conditions in the application include various underground complex conditions which can be recognized by a person skilled in the art, such as sticking, leakage, overflow, well kick, sticking during tripping, blocking during tripping, instability of the well wall, excessive thickness of mud cakes, or various well conditions which are easy to induce engineering accidents, such as a large-belly well section, a key groove or a step in the well, and the like. The invention provides a drill rod mud scraper for quick tripping under complex well conditions. The fastener is used for being detachably connected with any fixing equipment on the drill floor, so that the scraper can be conveniently installed when the mud is scraped during the drilling process, and the scraper can be detached after the drilling process is completed. The drill floor fixing equipment can be any equipment which is in a fixed state and can bear force on a drill floor, and comprises but is not limited to a throttle manifold, a drilling winch, a hydraulic cat head, an upright column box, a driller room body and even other tool storage devices which are in a fixed state; in addition, for the purpose of the application, the technical personnel in the field can also specially anchor the hook at a proper position on the ground of the drill floor to be used as a drill floor fixing device, and the detachable connection with the fastener is realized through the hook. Elastic component connecting fastener and installed part, installed part mainly used provide reliable and stable installation station for the mud scraper. The inner diameter of the mud scraper ring is smaller than the outer diameter of a rod body of a drill rod to be scraped when no external force acts, for example, if a 5-1/2' drill rod is used on a well, the inner diameter of the mud scraper ring in a natural state can be set to be 120-130 mm; if a 5' drill rod is used on the well, the inner diameter of the mud scraper ring in a natural state can be set to be 115-120 mm. Certainly, the concrete internal diameter size of mud scraping ring is not injectd in this application, and technical personnel in the field can set up in a flexible way as required, only need satisfy when the cover is outside the drilling rod, and the drilling rod can prop the mud scraping ring big to ensure the abundant contact of mud scraping ring and drilling rod outer wall, with this guarantee good mud effect of scraping. In order to facilitate the mud scraping ring to be sleeved outside the drill rod, the mud scraping ring is of an unclosed annular structure, namely, the annular structure is provided with an opening, two ends of the opening are respectively a fixed end and a movable end, and the fixed end is fixedly connected with the mounting piece all the time, so that the integral structure is ensured; and can dismantle between expansion end and the installed part and be connected, thereby be convenient for pull down the expansion end when using, thereby will scrape the mud circle and open the cover outside the drilling rod, also be convenient for after the tripping operation, will scrape the mud circle and open from the expansion end, the manpower will scrape the mud circle and take off from the drilling rod. Of course, in the course of the invention, the inventor also considered that the mud scraper ring is arranged in a closed ring structure, and tries to be sleeved outside the drill rod by deforming the mud scraper ring, so that the mud scraper ring needs to be sleeved from the top of the drill rod to the bottom. However, for the tripping under complex well conditions, the two major core principles are to keep the drilling tool active and to keep the drilling fluid circulating with small discharge, and in order to keep the drilling fluid circulating, the top drill rod must be always connected with a water tap or a top drive; on the premise, if a closed annular mud scraping ring is used, a traveling block is required to be lowered to the height of a rotary table surface to seat a slip, disassemble a faucet or carry out top driving, and then the mud scraping ring can be sleeved in, which seriously violates the two principles of keeping the drilling tool active and keeping the circulation of drilling fluid, so that the mud scraping ring scheme of the closed annular structure is limited by well conditions and cannot be applied to quick tripping under various complex well conditions; especially for the shaft bottom jamming, overflow and well leakage in the drilling process, the well depth is not enough to meet the requirement that the column drilling rod completely enters the well and the traveling block cannot descend to the height of the surface of the rotating disc at all, so that the mud scraper ring with a closed annular structure cannot be adopted. Therefore, the mud scraper ring with the closed ring structure cannot be applied to quick tripping under complex well conditions in all aspects, which is the technical idea of the present application that a unique unclosed mud scraper ring and a specific connection mode of two ends thereof are arranged, and the inventor pays a great deal of creative labor for the purpose.

The application process is as follows: before tripping, connecting the fastener to a fixing device at a proper position on a drill floor; the selection of the fixed equipment needs to satisfy the following conditions: when the mud scraping ring is pulled to be right above the wellhead, the elastic piece is in a stretching state. This is in order to ensure that the elasticity restoring force of elastic component is used in the installed part, makes the installed part receive the effort towards a certain direction all the time, and this effort transmits to on scraping mud ring for guarantee scraping mud ring and the laminating of drilling rod outer wall at the tripping operation in-process, ensure abundant mud scraping effect. After the fasteners are connected, the mud scraping ring is pulled to the position near a wellhead, the movable end is dismounted to be separated from the mounting piece, then the mud scraping ring is manually unfolded, the mud scraping ring is wound outside the drill rod, and the movable end is connected to the mounting piece again; at the moment, the whole mud scraping ring is expanded by the drill rod to generate deformation, and the elastic reset force of the mud scraping ring per se also ensures the full contact of the mud scraping ring and the outer wall of the drill rod. Then carrying out normal tripping operation; along with the drilling rod constantly by play in the well, the coupling position between two adjacent drilling rods must be through scraping the mud ring, and the coupling external diameter is greater than the drilling rod body of rod external diameter, if do not have the effect of elastic component this moment, scrapes the mud ring and easily is carried upward movement by the drilling rod coupling, leads to breaking away from even between the fastener. And this application has set up the elastic component after, when the mud scraping ring goes upward along with the drilling rod coupling, the elastic component is further tensile deformation and is the ascending orientation in slant, and the elastic component provides bigger elasticity restoring force this moment, can effectively pull back the mud scraping ring to the height of self-adaptation along drilling rod outer wall downwards for the mud scraping ring is propped big deformation and lets the coupling pass through smoothly. When the mud scraping ring is used, the mud scraping ring continuously moves upwards along with the lifted drill rod and is pulled downwards by the elastic piece, and the state is completely and automatically completed. The drill rig has the advantages that the structure is simple, the use is convenient, the drill rig hoisting equipment is not required to be used for dismounting and mounting the rotary disc bushing, the drilling tool can be effectively prevented from being static for a long time in the underground due to the installation of the traditional mud scraper, so that the requirement of quick drilling can be met when the well condition is poor and the underground condition is complex, the accident inducement of the installation of the traditional mud scraper is thoroughly avoided, and the blocking risk of the drilling tool is remarkably reduced; simultaneously, because this application has just reduced the process that twice dismouting carousel mended the core at one trip of the process of digging a hole, consequently effectively improved engineering efficiency.

In addition, compared with the prior art: (1) in the use process, the mud scraping ring is suspended and sleeved on the outer wall of the drill rod, so that the wellhead area of the rotary table surface cannot be occupied, and the normal seat bearing tile operation cannot be influenced; meanwhile, a driller only needs to ensure that the mud scraping ring is positioned below the drill rod coupling above the rotary disc surface in the process of disassembling the stand column, and then the large pliers can be normally used for disassembling the threads. Therefore, the long-distance drill-up operation requirement can be met by one-time sleeving for increasing extra workload for a driller in the drill-up process. (2) The application uses and can not influence normal speed of getting up a hole, and the dead time of well drilling tool is unchangeable when dismantling the stand, consequently can not increase the risk in the pit. (3) Strong magnetic interference resistance can not be applied to an upward drilling tool, and no adverse interference is caused on the load of a drilling winch, the service life of a drilling big rope, the load of a hook and the like. (4) The method is suitable for various complex well conditions needing quick tripping, and the condition that the well conditions are not allowed or the well conditions are not suitable for use is avoided.

On the other hand, this application still can realize the effect of automatic mud scraping at the in-process of drawing out, still the short operation of drawing out of well of specially adapted short tripping in-process can be in the well drilling trip-block in-process liberation driller, make two drillers at the well head can both obtain certain rest time between the seat slips of two adjacent drilling rod stands, the tong of beating and the operation of carrying the slips, obviously reduces the manpower consumption of drawing out of well.

The mounting part is fixedly provided with a hook, and the movable end is fixedly connected with a hanging ring matched with the hook. The hanging ring of the movable end of the mud scraping ring is hung on the hook on the mounting part, and detachable connection between the movable end and the mounting part is realized. Of course, when the mud scraping ring is sleeved outside the drill rod, the direction of the acting force exerted by the elastic element on the mounting element is required to enable the hanging ring to be hooked on the hanging ring more firmly.

The surface of the mounting piece is provided with a sliding chute, and one end of the sliding chute is communicated with a sinking groove; the movable end is fixedly connected with a sliding block matched with the sliding groove, and the sliding block can enter and exit from the sliding groove. The detachable connection that goes on through slider and spout in this scheme between expansion end and the installed part. When the movable end needs to be dismounted, the sliding block slides into the sinking groove along the sliding groove, and the sliding block is taken out; when the movable end needs to be connected, the sliding block is placed into the sinking groove, and then the sliding block is placed into the sliding groove. The scheme is to avoid the drilling rod coupling to pass through when scraping the mud ring, scrape the mud ring and excessively strut greatly or can't strut in the twinkling of an eye and let the drilling rod coupling pass through smoothly. Specifically, the method comprises the following steps: when the coupling goes upward to scraping mud ring department, the coupling props big mud ring of scraping, and the expansion end of scraping mud ring slides in the spout through the slider in the twinkling of an eye for the open end of scraping mud ring is opened greatly automatically, thereby is favorable to passing through smoothly of coupling, avoids for a long time forcing to prop big mud ring and leads to scraping mud ring rapid deformation problem, reduction the change frequency of scraping mud ring, is showing the life who has prolonged mud ring. And, after the coupling passes through the mud scraping ring, the mud scraping ring is automatic to shrink and reset, and the slider also moves in the spout in this process and resets.

The sliding groove is a dovetail groove or a T-shaped groove. The sliding blocks matched with the dovetail grooves or the T-shaped grooves can smoothly slide in the dovetail grooves or the T-shaped grooves along the direction of the sliding grooves but cannot freely fall off; the sliding block matched with the dovetail groove or the T-shaped groove in the scheme can only fall off when sliding into the sinking groove, and the sliding block can only enter the corresponding sliding groove by taking the sinking groove as a starting point.

Furthermore, the sliding groove is L-shaped or U-shaped. For an "L" or "U" shaped chute, the sink is located at one end, where the slider must pass at least one turn to reach the sink. When the mud scraping ring cover was outside the drilling rod, the manpower removed the slider to the spout in keep away from the one end of heavy groove, can thoroughly stop the possibility that the expansion end of dismantling the connection drops the installed part in the course of the work promptly.

The mounting part comprises a first side face and a second side face which are perpendicular to each other, and the fixed end and the movable end are connected with the first side face and the second side face respectively. Namely, the fixed end of the mud scraping ring is fixedly connected with the first side surface, and the movable end of the mud scraping ring is detachably connected with the second side surface. The fixed end and the movable end are respectively connected with two different but adjacent side faces of the mounting part, so that the mud scraping ring can be twisted into a non-planar spiral-like annular structure, thereby being beneficial to fully contacting with the outer wall of the drill rod in all directions and realizing the mud scraping effect without dead angles of 360 degrees.

The mud scraping ring comprises a metal wire and a rubber sleeve coated outside the metal wire. The metal wire is used as a framework to achieve the effects of increasing strength and optimizing toughness. And when the manpower opened mud scraping ring is sleeved outside the drill rod, the metal ring can also be opened flexibly from the opening end, and the normal use of the mud scraping ring in the application can not be influenced. The rubber sleeve is coated outside the metal wire, and the rubber sleeve is used as a part which is directly contacted with the outer wall of the drill rod, so that the purpose of scraping drilling fluid and rock debris attached to the outer wall of the drill rod is achieved, meanwhile, the characteristic of soft rubber is utilized to avoid damage to the outer wall of the drill rod, and the normal deformation effect of being expanded and automatically resetting can be realized.

Still include the telescopic link, the one end and the fastener fixed connection of telescopic link, the other end and elastic component fixed connection, the elastic component is kept away from the one end and the installed part fixed connection of telescopic link. The telescopic link plays the purpose of nimble adjustment this scraper length, and when suitable rig floor fixed equipment was far away from the wellhead distance, through the length of adjustment increase telescopic link, avoided the elastic component to be excessively elongated or even became invalid, is showing the use flexibility that improves this application, enlarges the application scope of this application on different rig floors.

The mud scraping method based on the drill rod mud scraper for quick tripping under complex well conditions comprises the following steps:

a. before tripping, connecting the fastener to a fixing device at a proper position on a drill floor; the selection of the fixed equipment satisfies the following conditions: when the mud scraping ring is pulled to be right above the wellhead, the elastic piece is in a stretching state;

b. pulling the mud scraping ring to the position near the wellhead, dismounting the movable end, winding the mud scraping ring outside the drill rod, and connecting the movable end to the mounting piece again;

c. and (6) tripping the drill.

Further, in the process of pulling out the drill, the drill rod of the previous column is completely lifted out of the rotary table surface, and the top end of the drill rod of the next column is lifted to be 1-1.5 m above the rotary table surface, and slips are seated; then the driller judges whether the mud scraping ring is positioned below the female coupling at the top end of the next column of drill rods: if the mud scraping ring is already positioned below the female coupling at the top end of the next column of drill rod, directly drilling a tong and breaking out; if the mud scraping ring is positioned above the female coupling at the top end of the next column of drill rod or is just sleeved on the coupling, the mud scraping ring is manually shifted downwards to be positioned below the female coupling at the top end of the next column of drill rod, and then tongs are driven and broken off; and after the shackle is removed, the derrick worker moves the previous column of drill rod away, the traveling block descends to the height of the wellhead, the elevator or the top drive or the water faucet is connected with the female coupling at the top end of the next column of drill rod, and the drill tripping operation of the next column of drill rod is continued.

The previous column of drill rod and the next column of drill rod in the method are for two adjacent columns of drill rods, wherein the previous column of drill rod refers to the column of drill rod just taking out the rotary table surface as a whole, and the next column of drill rod refers to the column of drill rod only taking out the rotary table surface from the top end and most of the rest of drill rod is still positioned below the rotary table.

In the method, the top end of the next column of drill rod is lifted to a height 1-1.5 m above the surface of the rotary table, the height is the surplus height of the slip of the normal drill rod, and meanwhile, the height can provide sufficient position space for the mud scraping ring to be positioned below the female coupling at the top end of the next column of drill rod, so that the method is proved not to cause any interference or discomfort to the normal drilling operation.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. in the working process, the mud scraping ring is suspended and sleeved on the outer wall of the drill rod, so that the wellhead area of the rotary table surface cannot be occupied, and the normal seat bearing tile operation cannot be influenced; meanwhile, a driller only needs to ensure that the mud scraping ring is positioned below the drill rod coupling above the rotary disc surface in the process of disassembling the stand column, and then the large pliers can be normally used for disassembling the threads. Therefore, the long-distance drill-up operation requirement can be met by one-time sleeving for increasing extra workload for a driller in the drill-up process.

2. The application can not influence the normal speed of pulling out a hole, can not prolong the dead time of drilling tool in the well when dismantling the stand, consequently can not increase the risk in the pit.

3. Strong magnetic interference resistance can not be applied to an upward drilling tool, and no adverse interference is caused on the load of a drilling winch, the service life of a drilling rope, the load of a hook and the like.

4. The method is suitable for various complex well conditions needing quick tripping, and the condition that the well conditions are not allowed or the well conditions are not suitable for use is avoided. The drilling tool is also suitable for short tripping operation in the process of short tripping, can liberate drillers in the process of upward movement of the drilling traveling block, enables two drillers at a wellhead to obtain certain rest time between the operations of the seat slips, the large pliers and the slip lifting of two adjacent drill rod stand columns, and obviously reduces the manpower consumption for tripping.

5. Need not to use the rig floor to lift by crane the equipment dismouting carousel and mend the core, can effectively avoid because of the drilling tool that the installation tradition mud scraper leads to stationary in the pit for a long time to can satisfy quick rig-up requirement when the well condition is not good, the situation is complicated in the pit, thoroughly stopped the installation tradition mud scraper this incident inducement, showing and having reduced the drilling tool and blocked the risk.

6. The drilling tool can be liberated in the upward process of the drilling traveling block, so that two drilling tools at a wellhead can obtain certain rest time between the operations of the seat slips, the large pliers and the slip lifting of two adjacent drill rod stand columns, and the manpower consumption for pulling out the drilling tool is obviously reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a top view of an embodiment of the present invention;

FIG. 2 is an isometric view of an embodiment of the present invention;

FIG. 3 is a top view of an embodiment of the present invention;

FIG. 4 is a partial schematic view of a wiper ring and mounting member according to an embodiment of the present invention;

FIG. 5 is a partial schematic view of a mount in an embodiment of the invention;

FIG. 6 is a schematic structural view of a slider matched with the sliding groove in FIG. 5;

FIG. 7 is a partial schematic view of a mount in an embodiment of the invention;

FIG. 8 is a schematic structural view of a slider matching the chute of FIG. 7;

fig. 9 is a schematic cross-sectional view of a wiper ring according to an embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

1-fastening piece, 2-mud scraping ring, 201-metal wire, 202-rubber sleeve, 3-mounting piece, 4-elastic piece, 5-hook, 6-hanging ring, 7-sliding groove, 8-sliding block, 9-sinking groove and 10-telescopic rod.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Example 1:

the drill pipe mud scraper for quick drilling under complex well conditions, as shown in figures 1 to 3, comprises a fastener 1 for being detachably connected to a drilling platform fixing device, a mounting part 3 for mounting a mud scraper ring 2, and an elastic part 4 connected between the fastener 1 and the mounting part 3; the mud scraping ring 2 is of an unclosed annular structure, two ends of the mud scraping ring 2 are respectively a fixed end and a movable end, the fixed end is fixedly connected to the mounting piece 3, and the movable end is detachably connected to the mounting piece 3; when no external force acts, the inner diameter of the mud scraping ring 2 is smaller than the outer diameter of the rod body of the drill rod to be scraped.

In this embodiment, the fastening member 1 is preferably a throat hoop or a hoop, and the elastic member 4 is preferably a nylon elastic rope or a belt.

In this embodiment, the link is passed through with the couple realization with dismantling of installed part to the expansion end, and is specific: the fixed couple 5 on installed part 3, the expansion end fixed connection with couple 5 assorted link 6. The hanging ring of the movable end of the mud scraping ring is hung on the hook on the mounting part, and detachable connection between the movable end and the mounting part is realized.

Preferably, the mounting member 3 is not limited in size, and theoretically the lower the weight, the better, and preferably a hollow lightweight material, such as an injection molded high strength plastic material, etc., is used to ensure good drillability when accidentally dropping into the well.

The mud scraping method of the embodiment is as follows: before the drill is pulled out, the fastener 1 is connected to a fixing device at a proper position on a drill floor; the selection of the fixed equipment needs to satisfy the following conditions: when the mud scraping ring 2 is pulled to be right above the wellhead, the elastic piece is in a stretching state. The drill floor fixing device in this embodiment may be any device that is in a fixed state and can bear force on the drill floor, including but not limited to a choke manifold, a drilling winch, a hydraulic cat head, a column box, a driller room body, and even other tool storage devices that are in a fixed state; in addition, for the purpose of the present application, a hanging point may be anchored specifically at a suitable location on the drill floor surface as a drill floor fixture, and the detachable connection with the fastener 1 may be achieved through the hanging point. After the fastening piece 1 is connected, the mud scraping ring 2 is pulled to the position near a wellhead, the movable end is detached, the movable end is separated from the mounting piece 3, then the mud scraping ring 2 is manually unfolded, the mud scraping ring 2 is wound outside a drill rod, and the movable end is connected to the mounting piece 3 again. Then, carrying out normal tripping operation, completely lifting the drill rod of the previous column out of the rotary table surface in the tripping process, lifting the top end of the drill rod of the next column to be 1-1.5 m above the rotary table surface, and seating slips; then the driller judges whether the mud scraping ring is positioned below the female coupling at the top end of the next column of drill rods: if the mud scraping ring is already positioned below the female coupling at the top end of the next column of drill rod, directly drilling a tong and breaking out; if the mud scraping ring is positioned above the female coupling at the top end of the next column of drill rod or is just sleeved on the coupling, the mud scraping ring is manually shifted downwards to be positioned below the female coupling at the top end of the next column of drill rod, and then tongs are driven and broken off; and after the shackle is removed, the derrick worker moves the previous column of drill rod away, the traveling block descends to the height of the wellhead, the elevator or the top drive or the water faucet is connected with the female coupling at the top end of the next column of drill rod, and the drill tripping operation of the next column of drill rod is continued.

The embodiment is particularly suitable for quick tripping operation under complex well conditions, and can also be used for other conventional long-section tripping operation or short-tripping operation.

Example 2:

a drilling rod scraper for quick tripping under complicated well condition, different from embodiment 1, the movable end realizes jointly through spout 7, slider 8 and heavy groove 9 with the dismantled connection of installed part in this embodiment. Specifically, the method comprises the following steps: a sliding groove 7 is formed in the surface of the mounting piece 3, and one end of the sliding groove 7 is communicated with a sinking groove 9; the movable end is fixedly connected with a sliding block 8 matched with the sliding groove 7, and the sliding block 8 can enter and exit the sliding groove 7 from a sinking groove 9.

Fig. 4 and 5 illustrate an embodiment: the sliding groove 7 is a dovetail groove, and the sliding groove 7 is U-shaped and can also be called eta-shaped. Fig. 6 shows a slider 8 arrangement which matches the runner 7 of fig. 5.

FIG. 7 illustrates another embodiment: the chute 7 is a T-shaped chute, and the chute 7 is U-shaped and can also be called eta-shaped. Fig. 8 shows a slider 8 arrangement which matches the runner 7 of fig. 7.

Preferably, the sliding groove 7 may be provided in an "L" shape.

The condition when the drilling rod coupling passes through mud scraper 2 has fully been considered in this embodiment:

for the existing mud scraper, the following methods are used for overcoming the interference when the drill pipe coupling passes through: the mud scraper is arranged in the turntable, and is pressed by locking the turntable, so that the mud scraper is prevented from moving upwards along with a drill rod coupling; manual mud scraping, namely pressing the mud scraper by manpower to prevent the mud scraper from ascending along with the drill rod coupling; and thirdly, the mud scraper is prevented from going upwards along with the drill rod coupling by a strong magnetic adsorption mode on the rotary disc. The drawbacks of the above three technical solutions are elaborated in detail in the background section, and the technical problems faced by the present application cannot be solved, and cannot be applied to the present application. For this reason, the smooth passing of the drill rod coupling is ensured by the embodiment from the following three points: the mud scraping ring 2 is provided with an opening and is in an unclosed annular structure, so that when a drill rod coupling passes through the mud scraping ring 2, the opening amplitude of the mud scraping ring 2 can be automatically expanded, and the drill rod coupling can smoothly pass through the mud scraping ring without forcibly driving the mud scraping ring 2 to move upwards by matching with an outer diameter gradual change section of the drill rod coupling; and after the drill rod coupling passes through the mud scraping ring 2, the mud scraping ring 2 can be automatically contracted and reset and is coated outside the drill rod body again. And secondly, the elastic piece 4 is arranged, if the mud scraping ring 2 moves upwards along with the drill rod coupling, the elastic piece 4 is further stretched and deformed and is in an upward oblique direction, and the elastic piece 4 provides a larger elastic resetting force, so that the mud scraping ring 2 can be effectively pulled back to the self-adaptive height along the outer wall of the drill rod downwards. The cooperation through slider 8 and spout 7 provides the degree of freedom for the expansion end of scraping mud ring 2, is showing the degree of opening that has improved 2 openings of mud ring, when the drilling rod coupling passes through, because it is opened by the extrusion from inside to scrape mud ring 2, slider 8 is removing of self-adaptation in spout 7, further reduction the frictional resistance between scraping mud ring 2 and the drilling rod coupling, be favorable to elastic component 4 to pull back down mud ring 2 fast.

Example 3:

in the drill pipe scraper for quick tripping under complex well conditions shown in fig. 2 and 3, on the basis of any one of the above embodiments, the mounting member 3 comprises a first side surface and a second side surface which are perpendicular to each other, and the fixed end and the movable end are respectively connected with the first side surface and the second side surface. In the embodiment shown in fig. 3, the projection of the mud scraper ring on the horizontal plane can form a substantially closed ring around the drill rod, thus ensuring a sufficient mud scraping effect on the outer wall of the drill rod.

As shown in the figure, in the embodiment, when the mud scraping ring is sleeved on the drill rod, the drill rod is vertical, the mud scraping ring is basically horizontal, the first side faces the direction of the drill rod, and the second side faces are positioned on the upper surface of the mounting part 3;

certainly, the second side surface can also be the lower surface of the mounting part 3, and only the second side surface positioned on the lower surface is inconvenient for workers to operate the detachable end of the mud scraper due to the obstructed view; the second side is therefore located on the upper surface of the mounting member 3 in a more preferred embodiment.

Example 4:

the drill rod mud scraper for quick drilling under complex well conditions as shown in fig. 1 to 3 further comprises an expansion link 10, one end of the expansion link 10 is fixedly connected with the fastening member 1, the other end of the expansion link is fixedly connected with the elastic member 4, and the end of the elastic member 4 far away from the expansion link 10 is fixedly connected with the mounting member 3.

The telescopic rod 10 in this embodiment is preferably a threaded pipe with two ends connected to each other, an inner thread is disposed on the inner wall of the threaded pipe close to the fastening member 1, an outer thread is disposed on the outer wall of the threaded pipe close to the elastic member 4, and the threaded pipes at the two ends are connected through threads and can flexibly extend and retract through relative rotation. When the selected drill floor fixing equipment is too close to or too far away from the wellhead, the length of the telescopic rod 10 is adjusted to ensure that the elastic part 4 is always in a proper tension state when the device is used.

Example 5:

on the basis of any of the above embodiments, as shown in fig. 9, the mud scraping ring 2 includes a metal wire 201 and a rubber sleeve 202 covering the metal wire 201. In the embodiment, the section of the metal wire 201 is circular, the outer diameter of the metal wire is 1.5cm, and the section of the rubber sleeve 202 is in the direction, so that the metal wire has a larger contact area with the outer wall of the drill rod, and a better automatic mud scraping effect is provided; meanwhile, the metal wire 201 and the rubber sleeve 202 are matched to enable the whole mud scraping ring 2 to have good elastic resetting capability, and the coupling can be quickly reset automatically after passing through the coupling.

The rubber sleeve 202 in this embodiment has a cross-sectional dimension of 3 × 2 cm.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The drill rod mud scraper for quick tripping under complex well conditions is characterized by comprising a fastener (1) detachably connected to a drilling platform fixing device, a mounting piece (3) for mounting a mud scraping ring (2), and an elastic piece (4) connected between the fastener (1) and the mounting piece (3); the mud scraping ring (2) is of an unclosed annular structure, two ends of the mud scraping ring (2) are respectively a fixed end and a movable end, the fixed end is fixedly connected to the mounting piece (3), and the movable end is detachably connected to the mounting piece (3); when no external force is acted, the inner diameter of the mud scraping ring (2) is smaller than the outer diameter of the rod body of the drill rod to be scraped; a sliding groove (7) is formed in the surface of the mounting piece (3), and one end of the sliding groove (7) is communicated with a sinking groove (9); the movable end is fixedly connected with a sliding block (8) matched with the sliding groove (7), and the sliding block (8) can enter and exit from the sinking groove (9) to the sliding groove (7).

2. The drill pipe scraper for quick tripping under complex well conditions as defined in claim 1, characterized in that a hook (5) is fixed on the mounting member (3), and the movable end is fixedly connected with a hanging ring (6) matched with the hook (5).

3. Drill pipe scraper for rapid tripping in complex well conditions according to claim 1, characterized in that the sliding groove (7) is a dovetail groove or a T-groove.

4. Drill pipe scraper for rapid tripping in complex well conditions, according to claim 1, characterized in that the chute (7) is "L" or "U" shaped.

5. The drill pipe scraper for rapid tripping in complex well conditions according to any of the claims 1 to 4, characterized in that the mounting member (3) comprises a first side surface and a second side surface which are perpendicular to each other, and the fixed end and the movable end are respectively connected with the first side surface and the second side surface.

6. The drill pipe scraper for rapid tripping in complex well conditions according to claim 1, characterized in that the scraper ring (2) comprises a wire (201), a rubber sleeve (202) covering the wire (201).

7. The drill rod scraper for quick drilling under complex well conditions is characterized by further comprising a telescopic rod (10), wherein one end of the telescopic rod (10) is fixedly connected with the fastening piece (1), the other end of the telescopic rod is fixedly connected with the elastic piece (4), and one end, far away from the telescopic rod (10), of the elastic piece (4) is fixedly connected with the mounting piece (3).

8. A mud scraping method of a drill pipe mud scraper for quick tripping under complex well conditions based on any one of the claims 1 to 7, characterized by comprising the following steps:

a. before the drill is pulled out, the fastener (1) is connected to a fixing device at a proper position on a drill floor; the selection of the fixed equipment satisfies the following conditions: when the mud scraping ring (2) is pulled to be right above the wellhead, the elastic piece (4) is in a stretching state;

b. the mud scraping ring (2) is pulled to the position near the wellhead, the movable end is dismounted, the mud scraping ring (2) is wound outside the drill rod, and the movable end is connected to the mounting piece (3) again;

c. and (6) tripping the drill.