CN103615191B - Pump pressure counterflush drilling method and system - Google Patents
Pump pressure counterflush drilling method and system Download PDFInfo
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- CN103615191B CN103615191B CN201310658941.XA CN201310658941A CN103615191B CN 103615191 B CN103615191 B CN 103615191B CN 201310658941 A CN201310658941 A CN 201310658941A CN 103615191 B CN103615191 B CN 103615191B
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Abstract
The present invention relates to drilling machinery field, in particular to a kind of pump pressure counterflush drilling method and system.This pump pressure counterflush drilling method, comprises the following steps: in the annular space of pit shaft, input drilling fluid; Described drilling fluid enters described drill bit from the hydrophthalmia of drill bit; Described drilling fluid enters drill string from described drill bit, and returns out from described drill string.Pump pressure counterflush drilling method and system of the present invention, when the voltage endurance capability of well mouth sealing device and the fracture pressure value on stratum enough time, theoretical drilling depth can be infinitely great.
Description
Technical field
The present invention relates to drilling machinery field, in particular to a kind of pump pressure counterflush drilling method and system.
Background technology
Along with the increase of the exploration and development difficulty of petroleum resources, drilling engineering technician is faced with all technical barriers.Drilling machinery drilling speed is low is one of key factor of restriction cost of exploration & development, and in shale gas horizontal well drilling process, the low Open-Hole Section that causes of drilling speed is immersed in drilling fluid for a long time, and cave-in is serious; The low drilling cost that causes of compact sandstone gas rate of penetration sharply increases, and the accelerating methods such as traditional bit type selection, drilling assembly optimization, casing program optimization are also difficult to obtain gratifying effect.In the drilling process of high angle hole, horizontal well, extended reach well, because of the existence of cutting bed, cause pit shaft to purify the series of problems such as bad, landwaste repeats fragmentation, the increase of drill string drag and torque, casing wear is serious, lock of tool drilling is frequent, cause drilling cost sharply to increase.
Current counterflush drilling technology mainly contains Pump breath countercirculate and gas lift reverse circulation two kinds in principle, Pump breath countercirculate is by the swabbing action of centrifugal pump, between atmospheric pressure and circulation line pressure reduction effect under set up reacting cycle, pressure reduction is limited, and its reacting cycle degree of depth is less than 200 meters.Gas lift reverse circulation relies on double-wall drill pipe, injecting gas in tubing string, the mud density making the inside and outside formation of circulation line certain is poor, reacting cycle is formed under this pressure reduction, because of the restriction by double-wall drill pipe intensity, the reacting cycle degree of depth is less than 3500 meters, and in high angle hole, horizontal well and extended reach well, drilling depth is less.
Summary of the invention
The object of the present invention is to provide a kind of pump pressure counterflush drilling method and system, to solve the above problems.
Provide a kind of pump pressure counterflush drilling method in an embodiment of the present invention, it comprises the following steps:
Drilling fluid is inputted in the annular space of pit shaft;
Drilling fluid enters drill bit from the hydrophthalmia of drill bit;
Drilling fluid enters drill string from drill bit, and returns out from drill string.
Further, in annular space, the drilling fluid of input pumps into pipe nipple through drilling fluid and enters annular space.
Further, rotation is used to send drill system to seal pit shaft one end away from drill bit, for ensureing that annular space inner fluid does not leak.
Further, hydrophthalmia is along drilling fluid flow direction convergent.
Additionally provide a kind of pump pressure counterflush drilling system, it comprises drill bit, drill string, pit shaft and power set;
Pit shaft is provided with inlet, and inlet is used for carrying drilling fluid in pit shaft;
Drill string is hollow circular cylinder, and its one end connects drill bit, other end connection side drilling rod, and power set rotate for driving drill string, and drill string is for driving drill bit rotational and drilling fluid return;
Drill string is through pit shaft, and pit shaft seals away between drill bit one end and drill string;
Drill bit is provided with hydrophthalmia, for drilling fluid return.
Further, hydrophthalmia is eight;
Four hydrophthalmias are evenly distributed on drill bit sidepiece along drill bit radial direction;
Four hydrophthalmias are evenly distributed on bottom drill bit along drill bit radial direction;
And/or,
Bottom four sidepiece hydrophthalmias and four drill bits, hydrophthalmia is along drill bit shaft to staggering 45 °;
Hydrophthalmia ecto-entad reduces gradually.
Further, pump pressure counterflush drilling system also comprises rotation and send drill system, and described rotation send drill system for seal shaft one end away from drill bit, and it comprises kelly bar, rotary body and overcoat;
Kelly bar is hollow cylinder, and kelly bar is through rotary body, and kelly bar one end is connected with drill string, and kelly bar rotates and drilling fluid return for driving drill string, and kelly bar other end connecting power device drives kelly bar to rotate by power set;
Rotary body is arranged in overcoat, can be rotated by kelly bar driven rotary body in overcoat.
Further, rotate and send drill system also to comprise slips, be arranged between kelly bar and rotary body;
And/or,
Rotation send drill system also to comprise base bearing, is arranged between rotary body and overcoat;
And/or,
Described rotation send drill system also to comprise Limit Bearing, is arranged between rotary body and overcoat, for preventing rotary body vertical tremor;
And/or,
Rotation send drill system also to comprise supporting seat, and overcoat is fixedly mounted on one end of supporting seat, and the other end of supporting seat is fixedly connected with pit shaft.
Further, pump pressure counterflush drilling system also comprises slush pump and one way valve, and one way valve one end connects pit shaft, and the other end connects slush pump, and one way valve is for controlling liquid flow path direction.
Further, pump pressure counterflush drilling system also comprises drilling fluid pot, for providing drilling fluid for pit shaft and reclaiming the drilling fluid refluxed in drill string.
Pump pressure counterflush drilling system of the present invention, by inputting drilling fluid in pit shaft, drilling fluid enters drill bit through pit shaft, enter drill string again drilling fluid is discharged, drilling liquid pressure is for overcoming the pressure loss in cyclic process, complete pump pressure reacting cycle, when the voltage endurance capability of well mouth sealing device and the fracture pressure value on stratum enough time, theoretical drilling depth can be infinitely great.
Accompanying drawing explanation
In order to be illustrated more clearly in the specific embodiment of the invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in detailed description of the invention or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is embodiment of the present invention pump pressure counterflush drilling system architecture schematic diagram;
Fig. 2 is that drill system structural representation is sent in embodiment of the present invention rotation;
Fig. 3 is that the embodiment of the present invention pumps into pipe nipple system;
Fig. 4 is embodiment of the present invention bit port arrangement diagram.
In figure, 1: slush pump; 2: pump into manifold of ground; 3: pump into pipe nipple system; 4: pit shaft; 5: annular space; 6: drill bit; 7: drill string; 8: kelly bar; 9: preventer flange; 10: supporting seat; 11: rotate and send drill system; 12: water tap; 13: gooseneck; 14: hose; 15: standpipe; 16: flow out manifold of ground; 17: sedimentation basin; 18: mud pit; 19: power set; 301: flange; 302: one way valve; 601: bit body; 602: connecting thread; 603: upper layer side hydrophthalmia; 604: lower layer side hydrophthalmia; 605: lower floor's hydrophthalmia; 1101: overcoat; 1102: snap joint; 1103: rotary body; 1104: base bearing; 1105: Limit Bearing; 1106: shockproof bearing; 1107: rotating seal component; 1108: slipper seal assembly; 1109: slips.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, carry out clear, complete description by technical scheme of the present invention below.Obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belong to the scope that the present invention protects.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
The invention provides a kind of pump pressure counterflush drilling method, it comprises the following steps:
Drilling fluid is pumped in the annular space 5 of pit shaft 4;
Drilling fluid enters drill bit 6 from the hydrophthalmia of drill bit 6;
Drilling fluid enters drill string 7 from drill bit 6, and returns out from drill string 7.
Operating principle of the present invention is the drilling fluid being pumped into certain pressure by surface mud pump 1 to annular space 5, forces drilling fluid enter the hydrophthalmia of drill bit 6 and return out earth's surface on drill string 7 inside, thus completes circulation.
Carry out precipitating or filtering before the drilling fluid of discharging in drill string 7 is recycled again.
Drilling fluid is when drill string 7 is discharged, can with a large amount of landwaste, if just do not continue to use through precipitation or filtration, well mouth sealing device may be damaged, in the annular space 5 of pit shaft 4 or the hydrophthalmia place of drill bit 6 result in blockage, increase cyclic pressure dissipation, even very large destruction is caused to machine, thus affect normal drilling well work.
Further, in annular space 5, the drilling fluid of input pumps into pipe nipple system 3 through drilling fluid and enters annular space 5.
In annular space 5, the drilling fluid of input pumps into pipe nipple system 3 through drilling fluid and enters pit shaft 4, thus ensures that drilling fluid can pump into pit shaft 4, and the drilling fluid in pit shaft 4 can not flow out from pit shaft 4.
Further, use to rotate and send drill system 11 pairs of pit shafts 4 to seal away from one end of drill bit 6, can ensure that the drilling fluid that drill string 7 pumps into when rotating does not leak.
Further, hydrophthalmia is along drilling fluid flow direction convergent.
The setting that on drill bit 6, hydrophthalmia is such, can ensure drilling fluid to return resistance less, landwaste can in time on return, thus the process of drilling well can not be affected.
As shown in Figure 1, based on said method, present invention also offers a kind of pump pressure counterflush drilling system, it comprises drill bit 6, drill string 7, pit shaft 4 and power set 19;
Pit shaft 4 is provided with inlet, and inlet is used for carrying drilling fluid in pit shaft 4;
Drill string 7 is hollow circular cylinder, and its one end connects drill bit 6, other end connecting power device 19, and power set 19 rotate for driving drill string 7, and drill string 7 rotates and drilling fluid return for driving drill bit 6;
Drill string 7 is through pit shaft 4, and pit shaft 4 seals away between drill bit 6 one end and drill string 7;
Drill bit 6 is provided with hydrophthalmia, for drilling fluid return.
Drill bit 6 comprises bit body 601 and connecting portion, and connecting portion is used for being fixedly connected with drill string 7, and hydrophthalmia is arranged on bit body 601.
Pump pressure counterflush drilling system by inputting drilling fluid in pit shaft 4, and drilling fluid, through the annular space 5 between pit shaft 4 and drill string 7, enters drill bit 6 by the hydrophthalmia on drill bit 6, then enters drill string 7, discharged by drilling fluid afterwards, complete pump pressure reacting cycle; Pit shaft 4 is arranged away from one end sealing of drill bit 6, ensures that the drilling fluid in reacting cycle process does not leak.
By such mode, circulate in the direction that drilling fluid is contrary with existing mode, to be inhaled from pump or gaslift becomes pump pressure, along with the intensification of the degree of depth of drilling well, the pressure of drilling fluid in annular space 5 is improved by continuous to be inputted in pit shaft 4 by drilling fluid, the pressure loss in cyclic process can be overcome, complete pump pressure reacting cycle, theoretical drilling depth is determined by the voltage endurance capability of well mouth sealing device and the fracture pressure value on stratum, as long as namely annular space 5 good seal and Open-Hole Section stratum can have enough voltage endurance capabilities away from one end of drill bit 6, so theoretical drilling depth is just determined by the ability of ground pump.
As shown in Figure 4, be preferred embodiment that hydrophthalmia is eight;
Four hydrophthalmias are evenly distributed on drill bit 6 sidepiece along drill bit 6 radial direction;
Four hydrophthalmias are evenly distributed on bottom drill bit 6 along drill bit 6 radial direction.
Hydrophthalmia quantity can arrange at most 8 hydrophthalmias, carries out shutoff or unlatching as required to each hydrophthalmia.When installation eight hydrophthalmias time, the sidepiece of drill bit 6 can arrange four hydrophthalmias, because of drill bit 6 work in row under rotation always, so four hydrophthalmias can not at grade, as shown in Figure 4, upper layer side hydrophthalmia 603 and lower layer side hydrophthalmia 604 are not at grade, but be uniformly distributed in drill bit 6 radial direction, to guarantee the landwaste evenly drawing drill bit 6 fragmentation, what the hydrophthalmia had that the hydrophthalmia do not had is drawn was drawn more lacks, thus many application life of absorption is reduced; Bottom drill bit 6, arrange four hydrophthalmias, lower floor's hydrophthalmia 605 as shown in Figure 4, it also needs to be uniformly distributed along drill bit 6 radial direction, to ensure the application life of each hydrophthalmia.
Preferred embodiment is, hydrophthalmia ecto-entad convergent;
And/or hydrophthalmia axially staggers 45 ° along drill bit 6 bottom four sidepiece hydrophthalmias and four drill bits 6.
Because the direct of travel of drilling fluid in hydrophthalmia is ecto-entad, so the flowing of conveniently drilling fluid, and the absorption of landwaste, hydrophthalmia is set to the little mode of outer imperial palace, its ecto-entad convergent, thus can ensures that landwaste and drilling fluid can enter hydrophthalmia fast.
Four sidepiece hydrophthalmias and four bottom hydrophthalmias axially stagger 45 ° along drill bit 6, and namely eight hydrophthalmias are uniformly distributed in drill bit 6 radial direction, and the application life further ensuring each hydrophthalmia is more or less the same, thus can ensure the maximum service life (MSL) of drill bit 6.
As shown in Figure 2, pump pressure counterflush drilling system also comprises rotation and send drill system 11, and rotate and send drill system 11 for seal shaft 4 one end away from drill bit 6, it comprises kelly bar 8, rotary body 1103 and overcoat 1101.
Kelly bar 8 is hollow cylinder, kelly bar 8 is through rotary body 1103, kelly bar 8 one end is fixedly connected with drill string 7 one end away from drill bit 6, kelly bar 8 is for driving drill string 7 rotation and drilling fluid return and providing brokenly rock power, kelly bar 8 other end connecting power device 19, drives kelly bar 8 to rotate by power set 19.
Rotary body 1103 is arranged in overcoat 1101, can be rotated by kelly bar 8 driven rotary body 1103 in overcoat 1101.
Overcoat 1101 top is cylinder, and bottom is tetragonal body or hexahedron.
Rotary body 1103 and overcoat 1101 relatively rotate, and there are four square holes or hexagonal hole in rotary body 1103 center, and kelly bar 8 can pass wherein.
Rotation send drill system 11 also to comprise slips 1109, is arranged between kelly bar 8 and rotary body 1103.
Due between kelly bar 8 and rotary body 1103 because manufacturing process problem inevitably there will be gap, and slips 1109 is set between kelly bar 8 and rotary body 1103, slips 1109 not only can seal kelly bar 8 and rotary body 1103, also ensure that owing to eliminating gap and do not rock between kelly bar 8 and rotary body 1103, thus extend both application life.
Rotation send drill system 11 also to comprise base bearing 1104, is arranged between rotary body 1103 and overcoat 1101;
And/or, rotating and send drill system 11 also to comprise Limit Bearing 1105, being arranged between rotary body 1103 and overcoat 1101, for preventing rotary body 1103 vertical tremor.
If the Contact between rotary body 1103 and overcoat 1101, owing to there is relatively rotating between rotary body 1103 and overcoat 1101, thus have very large friction.After base bearing 1104 is set between rotary body 1103 and overcoat 1101, is completed by base bearing 1104 between the two and relatively rotate, thus substantially reduce friction between the two, extend the application life of rotary body 1103 and overcoat 1101.
Limit Bearing 1105 can also being provided with between rotary body 1103 and overcoat 1101, for placing rotary body 1103 vertical tremor in overcoat 1101, thus causing the damage of rotary body 1103 or overcoat 1101.Multiple Limit Bearing 1105 can also be added when vibrations are larger, or shockproof bearing 1106 can also be added, as long as it can prevent rotary body 1103 from shaking in overcoat 1101.
Rotation send drill system 11 also to comprise supporting seat 10, and overcoat 1101 is fixedly mounted on one end of supporting seat 10, and the other end of supporting seat 10 is fixedly connected with pit shaft 4.
Rotation is sent between drill system 11 and pit shaft 4 and is not easily directly fixed, therefore send on drill system 11 in rotation and be provided with supporting seat 10, overcoat 1101 is fixed on the top of supporting seat 10 by snap joint 1102, the below of supporting seat 10 is fixed on pit shaft 4 by preventer flange 9, the drill system 11 that rotation sent that can be very stable is fixed, thus ensure that the sealing of pit shaft 4.
Rotary body 1103 and overcoat 1101 are tightly connected;
And/or, for being threaded between drill bit 6 with drill string 7.
Rotary body 1103 and overcoat 1101 bottom are provided with rotating seal component 1107, and kelly bar 8 and rotary body 1103 center are provided with slipper seal assembly 1108, are sealed by pit shaft 4 inner high voltage drilling fluid.
Due to the existence of slips 1109, it can transmit the torsion of kelly bar 8, on the slipper seal assembly 1108 that the torsion of kelly bar 8 is not acted directly between kelly bar 8 and rotary body 1103, thus can not affect the application life of slipper seal assembly 1108.
Adopt between drill bit 6 with drill string 7 and be threaded, namely connected by connecting thread 602, the replacing when drill bit 6 damages can be conducive to like this.
It is pointed out that to be not limited between drill bit 6 with drill string 7 and be threaded, can also be that other connect, as welding, binding etc., as long as the connection that both can be fixed together can.
Pump pressure counterflush drilling system also comprises slush pump 1 and one way valve 302, as shown in Figure 3, one way valve 302 pumps into pipe nipple system 3 with flange 301 common composition, and one way valve 302 is fixedly connected on pit shaft 4, and the other end is connected to by flange 301 and pumps on manifold of ground 2.
One way valve 302 can allow drilling fluid can only flow into pit shaft 4 can not to flow out in pit shaft 4, and when ensure that well kick or blowout, pit shaft 4 inner high voltage fluid can not spray, and avoids injury and damage equipment.
When carrying drilling fluid in pit shaft 4, can be carried by slush pump 1.Drilling fluid is delivered in pit shaft 4 by pumping into manifold of ground 2 by slush pump 1.
Pump pressure counterflush drilling system also comprises drilling fluid pot, for providing drilling fluid for pit shaft 4 and reclaiming the drilling fluid refluxed in drill string 7.
When drilling fluid pot is very large time, can be a pond just, the landwaste in the drilling fluid of pump pressure counterflush drilling system flowback precipitates in the side of drilling fluid pot, opposite side flow out enter pump pressure counterflush drilling system.
When drilling fluid pot is little time, drilling fluid pot can be divided into sedimentation basin 17 and mud pit 18, add filter screen between sedimentation basin 17 and mud pit 18 to filter, the drilling fluid refluxed in kelly bar 8 enters sedimentation basin 17 and precipitates, mud pit 18 is entered after strainer filtering, drilling fluid is conveyed into pit shaft 4 by slush pump 1 by mud pit 18, completes reacting cycle process.
The course of work of whole pump pressure counterflush drilling system is:
Drilling fluid is extracted out by slush pump 1 from mud pit 18, be delivered in pit shaft 4 by pumping into manifold of ground 2 and pumping into pipe nipple system 3, by annular space 5 in pit shaft 4, utilize the pressure of surface mud pump 1, overcome cyclic pressure dissipation, force drilling fluid to return through the hydrophthalmia of drill bit 6, drill string 7 endoporus from annular space 5, enter kelly bar 8, again through water tap 12, gooseneck 13, hose 14, standpipe 15, outflow manifold of ground 16, finally enter sedimentation basin 17, thus complete pump pressure reacting cycle process.
After stroke covered by kelly bar 8, because of drill string 7 and joint less than kelly bar 8 size, kelly bar 8 and lower drilling string 7 and drill bit 6 are carried from rotary body 1103 centre bore, unload kelly bar 8, connect a drill string 7, and then kelly bar 8 is connected, below to rotary body 1103 centre bore, thus can proceed drilling well work.
When rotate send the seal of drill system 11 to break down to need change time, open snap joint 1102, rotation sent drill system 11 together lift-off well head, can carry out easily dismantling and keeping in repair on drilling machine platform.After maintenance is good, then rotation sent drill system 11 to transfer, by snap joint 1102 fixed supporting seat 10, thus drilling well work can be proceeded.
When surface mud pump 1 ability and rotation send the movable sealing ability of drill system 11 enough large, the theoretical drilling depth of pump pressure counterflush drilling can be without depth stop.
Pump pressure counterflush drilling system of the present invention, by inputting drilling fluid in the annular space 5 of pit shaft 4, drilling fluid enters drill bit 6 through annular space 5, enter drill string 7 again drilling fluid is discharged, drilling liquid pressure is for overcoming the pressure loss in cyclic process, complete pump pressure reacting cycle, the voltage endurance capability of well mouth sealing device and the fracture pressure value on stratum enough time, theoretical drilling depth can be infinitely great.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a pump pressure counterflush drilling system, is characterized in that, comprises drill bit, drill string, pit shaft and power set;
Described pit shaft is provided with inlet, and described inlet is used for carrying drilling fluid in described pit shaft;
Described drill string is hollow circular cylinder, and its one end connects described drill bit, and the other end connects described power set, and described power set rotate for driving described drill string, and described drill string is for driving described drill bit rotational and drilling fluid return;
Described drill string is through described pit shaft, and described pit shaft seals away between described drill bit one end and described drill string;
Described drill bit is provided with hydrophthalmia, for drilling fluid return;
Also comprise rotation and send drill system, described rotation send drill system for sealing described pit shaft one end away from described drill bit, and it comprises kelly bar, rotary body and overcoat;
Described kelly bar is hollow cylinder, described kelly bar is through described rotary body, described kelly bar one end is connected with described drill string, described kelly bar rotates and drilling fluid return for driving described drill string, the described kelly bar other end connects described power set, drives described kelly bar to rotate by described power set;
Described rotary body is arranged in described overcoat, described rotary body can be driven to rotate in described overcoat by described kelly bar.
2. pump pressure counterflush drilling system according to claim 1, is characterized in that, described hydrophthalmia is eight;
Four described hydrophthalmias are evenly distributed on described drill bit sidepiece along described drill bit radial direction;
Four described hydrophthalmias are evenly distributed on bottom described drill bit along described drill bit radial direction;
And/or described hydrophthalmia is along described drill bit shaft to staggering 45 ° bottom hydrophthalmia described in four sidepieces and four drill bits;
Described hydrophthalmia ecto-entad reduces gradually.
3. pump pressure counterflush drilling system according to claim 1, it is characterized in that, described rotation send drill system also to comprise slips, is arranged between described kelly bar and described rotary body;
And/or,
Rotation send drill system also to comprise base bearing, is arranged between described rotary body and described overcoat;
And/or,
Described rotation send drill system also to comprise Limit Bearing, is arranged between described rotary body and described overcoat, for preventing described rotary body vertical tremor;
And/or,
Rotation send drill system also to comprise supporting seat, and described overcoat is fixedly mounted on one end of described supporting seat, and the other end of described supporting seat is fixedly connected with described pit shaft.
4. pump pressure counterflush drilling system according to claim 1, is characterized in that, also comprise slush pump and one way valve, and described one way valve one end connects described pit shaft, and the other end connects described slush pump, and described one way valve is for controlling liquid flow path direction.
5. the pump pressure counterflush drilling system according to any one of claim 2-4, is characterized in that, also comprise drilling fluid pot, for providing drilling fluid for described pit shaft and reclaiming the drilling fluid refluxed in described drill string.
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| CN201310658941.XA CN103615191B (en) | 2013-12-06 | 2013-12-06 | Pump pressure counterflush drilling method and system |
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| CN201310658941.XA CN103615191B (en) | 2013-12-06 | 2013-12-06 | Pump pressure counterflush drilling method and system |
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| CN103867149A (en) * | 2013-09-11 | 2014-06-18 | 华北石油管理局 | Circulation method of coal bed gas multi-branch horizontal well drilling media |
| CN103850660A (en) * | 2014-03-13 | 2014-06-11 | 中石化胜利建设工程有限公司 | Mud circulating method and circulating system for cast-in-place pile construction |
| CN105134114A (en) * | 2015-10-10 | 2015-12-09 | 中国石油集团川庆钻探工程有限公司 | Reverse circulation gas drilling tool composite structure |
| CN106693513A (en) * | 2017-02-08 | 2017-05-24 | 湖南省交通规划勘察设计院 | Cyclic utilization sedimentation tank suitable for drilling water and cyclic utilization method |
| CN112647848B (en) * | 2020-11-30 | 2023-04-14 | 中海石油（中国）有限公司天津分公司 | Deep well drilling process simulation experiment device and experiment method |
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| CN1206441C (en) * | 2002-01-11 | 2005-06-15 | 中国石油天然气集团公司 | Reverse cycle drilling method and equipment for oil well or gas well |
| CN102003140B (en) * | 2010-10-20 | 2012-10-17 | 中国地质大学（武汉） | Traversing reverse circulating drilling method of horizontal directional drilling pipeline and special drilling bit |
| CA2854812A1 (en) * | 2011-11-08 | 2013-05-16 | Chevron U.S.A. Inc. | Apparatus and process for drilling a borehole in a subterranean formation |
| CN202560133U (en) * | 2012-04-12 | 2012-11-28 | 石家庄煤矿机械有限责任公司 | Gas lifting reverse circulation drilling device |
| CN203594354U (en) * | 2013-12-06 | 2014-05-14 | 中国石油大学 | Pump pressure reverse-circulation well drilling system |
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Granted publication date: 20150812 Termination date: 20171206 |