CN112377106A - Device and method for drilling and modifying hot dry rock reservoir - Google Patents
Device and method for drilling and modifying hot dry rock reservoir Download PDFInfo
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- CN112377106A CN112377106A CN202011380670.2A CN202011380670A CN112377106A CN 112377106 A CN112377106 A CN 112377106A CN 202011380670 A CN202011380670 A CN 202011380670A CN 112377106 A CN112377106 A CN 112377106A
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- 238000005553 drilling Methods 0.000 title claims abstract description 164
- 239000011435 rock Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 38
- 206010017076 Fracture Diseases 0.000 claims abstract description 28
- 208000010392 Bone Fractures Diseases 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 210000002445 nipple Anatomy 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 238000002407 reforming Methods 0.000 claims description 36
- 239000012530 fluid Substances 0.000 claims description 26
- 230000000903 blocking effect Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims description 2
- 238000005755 formation reaction Methods 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000004441 surface measurement Methods 0.000 claims 1
- 230000004048 modification Effects 0.000 abstract description 10
- 238000012986 modification Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 230000000638 stimulation Effects 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 6
- 230000001131 transforming effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 239000002002 slurry Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000009527 percussion Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
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- Geochemistry & Mineralogy (AREA)
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Abstract
The invention discloses a device and a method for drilling and transforming a hot dry rock reservoir, wherein the device comprises a drill bit, a micropore drilling device, a power nipple, an upper joint, a connecting joint string and a continuous oil pipe which are sequentially connected; the device can also comprise a downhole measurement while drilling tool, a direction finder and a downhole thruster; the drill bit is provided with a front nozzle; a plugging column is arranged in the center of the interior of the drill bit, and a spring is sleeved on the plugging column; the side wall of the micropore drilling device is provided with a plurality of lateral nozzles; the inner wall of the micropore drilling device is sleeved with a control sleeve, and the center of the control sleeve is provided with a flow passage. The invention can respectively carry out injection modification on a thermal reservoir with low natural fracture development in the main borehole and a thermal reservoir with low fracture quantity or poor connectivity in the main borehole, can increase modification volume and reduce microseismic risk, and can be implemented by matching with a chemical stimulation method to improve modification effect.
Description
Technical Field
The invention relates to the technical field of hot dry rock drilling, in particular to a device and a method for drilling and modifying a hot dry rock reservoir.
Background
The dry heat rock is a green clean energy source which is inexhaustible, and in the development process of the dry heat rock, an injection and production well is usually drilled, and a dry heat rock reservoir is transformed so as to increase the heat exchange volume and enhance the connectivity of the reservoir.
The methods commonly used today are hydraulic fracturing, chemical and thermal stimulation, etc. The hydraulic fracturing method has great influence on the stratum, micro-earthquakes are easy to generate, the heat exchange area of the formed single high-permeability fracture is small, and meanwhile, the direction control is difficult. The thermal stimulation method closes part of cracks along with the temperature rising after the thermal stimulation is finished. Chemical stimulation reacts with rock mass minerals quickly in a high-temperature environment, is difficult to permeate deep parts of a heat reservoir, and causes corrosive damage to an underground casing string.
Therefore, in order to overcome the defects of the prior art and simultaneously deal with different situations of fracture development and non-development in the main borehole, an urgent need exists in the art for providing a device and a method capable of effectively drilling and modifying a hot dry rock reservoir.
Disclosure of Invention
In view of the above, the present invention provides a device for drilling and reforming a hot dry rock reservoir, which aims to solve the above technical problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
an apparatus for drilling a dry hot rock reservoir, comprising: the drilling head, the micropore drilling device, the power short section, the upper joint, the connecting joint string and the continuous oil pipe are connected in sequence;
the bottom of the drill bit is provided with a plurality of front-end nozzles; a plugging column is arranged in the center of the drill bit, and a spring is sleeved on the plugging column; the micro-hole drilling device is of a cylindrical structure with two open ends, a plurality of lateral nozzles are uniformly distributed on the side wall close to the power nipple in the circumferential direction, and the lateral nozzles are communicated with the interior of the micro-hole drilling device; the inner side wall of the micropore drilling device is connected with a control sleeve in a sliding way, the axis of the control sleeve is provided with a flow passage, two ends of the flow passage penetrate through the control sleeve, and the flow passage corresponds to the plugging column; and the coiled tubing is connected with a bottom drilling tool assembly consisting of an upper joint, a power nipple and a drill bit through the connecting joint string.
According to the technical scheme, the high-pressure hydraulic jet rock breaking device is adopted, after a main well bore is formed, equipment such as a continuous oil pipe and an underground micropore jet modification tool are placed to the well bottom, high-pressure abrasive jet flow after ground mixing is pumped to the well bottom, the jet rock breaking is carried out on a target layer section, the opening and closing of a lateral nozzle are controlled through the movement of a control sleeve in a micropore drilling rig, cracks near the well bore are deepened, meanwhile, the well bore is communicated with original cracks in a stratum to form a crack type grid, the device adjusts the position of the control sleeve through the discharge capacity, the switching jet of a front-end nozzle and the lateral nozzle is realized, further, the deepening of cracks near the well bore is completed, and the modification effect is improved.
Preferably, in the device for drilling and modifying the hot dry rock reservoir, the flow channel is a two-stage stepped hole, and the aperture of the flow channel at one end facing the power nipple is larger than that at one end facing the plugging column; the aperture of one end of the flow passage facing the plugging column is smaller than the diameter of the plugging column. The spraying and plugging functions of the flow channel can be met.
Preferably, in the device for drilling and reforming the hot dry rock reservoir, the end face of the plugging column is flush with the end face of the microporous drilling device facing the drill bit direction; the length of the control sleeve is smaller than the length from the end face of the micropore drilling device facing the drill bit direction to the lateral nozzle. The switching function of the control sleeve to the front end nozzle and the lateral nozzle can be met.
Preferably, in the device for drilling and modifying the hot dry rock reservoir, the injection end of the coiled tubing is connected with a jet mixing and pressurizing device and a mud pump, and the source of the fluid can be switched through a surface manifold. The pressure supply requirement of slurry injection can be met.
Preferably, in the above apparatus for drilling a modified hot dry rock reservoir, the lateral wall of the micro-hole drilling rig has an outer pin hole, and the outer pin hole is located between the lateral nozzle and the end face of the micro-hole drilling rig facing the power sub; the side wall of the control sleeve is provided with an inner pin hole corresponding to the outer pin hole. After drilling is finished, drilling media are switched into high-pressure abrasive jet flow from drilling fluid through a ground manifold, the control sleeve is pushed to descend by increasing the discharge capacity, the control sleeve descends to the bottom after a pin is cut off, a front-end nozzle on a drill bit is blocked, then a lateral nozzle on a micropore drilling device starts to work, micropores can be formed on the side wall of the micropores continuously through the high-pressure jet flow, and the transformation effect is improved. The pin can satisfy the stability of the control sleeve in the drilling process, prevents that it from causing the shutoff to the front end nozzle when directional sidetracking from leading to the drilling fluid can't wash shaft bottom detritus.
The invention also provides a method for drilling and modifying the dry hot rock reservoir on the basis of the device for drilling and modifying the dry hot rock reservoir, which aims at performing drilling and modification on a hot reservoir with natural fracture development in a main borehole and comprises the following steps:
s1, after a main well bore is drilled, the device for drilling and transforming the dry hot rock reservoir is put into an interval to be transformed, high-pressure abrasive jet is mixed and pressurized on the ground through jet mixing and pressurizing equipment, and is sent to a micropore drilling rig through a continuous pipe, a control sleeve is driven by the high-pressure abrasive jet with large displacement to cut off a pin and then move towards a drill bit, so that a blocking column blocks a flow passage, the flow passage at a lateral nozzle is opened, and the high-pressure abrasive jet sprays and breaks rocks on a target interval through the lateral nozzle to form cracks and deepen;
s2, after the step S1 is completed, stopping jetting or reducing jet flow discharge, pushing the control sleeve to reset through a spring, plugging the lateral nozzles, opening the front end nozzle, lifting or lowering the coiled tubing to enable the device for drilling and reforming the dry and hot rock reservoir to reach the next layer section to be reformed, repeating the steps S1 and S2, and gradually completing the multi-section reforming of the dry and hot rock reservoir until the reforming requirements are met.
According to the technical scheme, the method adopts high-pressure hydraulic jetting to break rock, mainly aims at drilling and reforming a thermal reservoir in which natural fractures develop in a main well bore, and conducts jetting and rock breaking on a target interval by pumping high-pressure abrasive jet flow mixed on the ground to the well bottom to deepen the fractures near the well bore and simultaneously enable the well bore to be communicated with original fractures in the formation to form a fracture type grid. The method mainly utilizes natural fractures of the stratum, can increase the reconstruction volume and reduce the risk of microseisms, and can be implemented by matching with a chemical stimulation method to improve the reconstruction effect.
The invention also provides an improved device for drilling and reforming the hot dry rock reservoir on the basis of the device for drilling and reforming the hot dry rock reservoir, which comprises the device for drilling and reforming the hot dry rock reservoir; the device also comprises a bottom while-drilling measuring tool, a direction finder and a bottom thruster which are sequentially connected between the upper joint and the connecting joint string, and adopts mud pulse transmission control; or the device also comprises a direction finder, a downhole measurement while drilling tool and a downhole thruster which are connected between the upper connector and the connecting connector string, and adopts cable transmission control.
According to the technical scheme, the device drives the device for drilling and reforming the hot dry rock reservoir to rotate to the preset adjusted tool face angle and then lock, so that the drilling direction is adjusted; through mixing the high-pressure abrasive material efflux pump sending of accomplishing with ground to the shaft bottom, spout broken rock to the target interval, through the removal in the control cover micropore drilling ware, the switching of control side direction nozzle deepens near the pit shaft crack, make the pit shaft and the original crack in the stratum intercommunication simultaneously, form crack type net, the device passes through the position of injection pressure adjustment control cover, realizes the switching of front end nozzle and side direction nozzle and spouts and spout, and then accomplish near the crack deepening of pit shaft, improve and reform transform the effect.
Preferably, in the device for drilling and modifying the hot dry rock reservoir, the ground is further provided with ground measurement and control equipment which decodes data uploaded by a downhole measurement-while-drilling tool and issues technical personnel instruction codes to the direction finder and the downhole thruster. The near-bottom measurement while drilling tool can measure well deviation, direction, tool face angle, temperature and other data in real time, transmit the measured parameters to ground measurement and control equipment through mud pulse or underground cable, and send further instructions by ground technicians.
The invention also provides a method for drilling and reforming the dry hot rock reservoir on the basis of the improved device for drilling and reforming the dry hot rock reservoir, which aims at the hot reservoir with low number of cracks or poor connectivity in a main borehole and comprises the following steps:
s1, the improved device for drilling and reforming the dry hot rock reservoir is put into a well logging display natural fracture development section for directional sidetracking, a high-pressure drilling fluid is used for driving a power short section to drive a drill bit to carry out rotary or percussion drilling on the dry hot rock reservoir to break rock, a new micro well bore is drilled, a well bottom measurement-while-drilling tool in the drilling process uploads measured well bore track parameters to the ground, the well bottom measurement-while-drilling tool judges whether the orientation is needed or not after resolving through ground measurement and control equipment, continuous oil pipe orientation operation is carried out if the orientation is needed, drilling fluid pressure pulse or cable signals are generated through the ground measurement and control equipment and are transmitted to an operation director, the direction director rotates a tool face angle to a planned position and then locks the tool face angle, and sliding;
s2, in the micro branch well drilling process in the step S1, a mud pump pressurizes the drilling fluid and then injects the drilling fluid into the continuous oil pipe, the mud enters the drill bit from the flow channel of the control sleeve, is sprayed to the bottom of the well through a front end nozzle, and is sprayed to the bottom of the side well drilling well to break rocks;
s3, after the micro branch well bore in the step S1 is drilled, the well entering fluid is switched from the drilling fluid to high-pressure abrasive jet after being mixed and pressurized by jet mixing and pressurizing equipment through a ground manifold, the control sleeve is driven to move towards the direction of a drill bit by increasing the jet discharge capacity, so that the blocking column blocks the flow channel, the outer side wall of the control sleeve descends to open the flow channel at the lateral nozzle, the high-pressure jet is sprayed to the surrounding well wall through the lateral nozzle to deepen cracks near a target interval;
s4, after the step S3 is completed, stopping jetting or reducing jet flow discharge, pushing the control sleeve to reset through a spring, plugging the lateral nozzles, opening the front end nozzle, lifting or lowering the coiled tubing to enable the device for drilling and reforming the dry and hot rock reservoir to reach the next layer section to be reformed, repeating the steps S1 and S2, and gradually completing the multi-section reforming of the dry and hot rock reservoir until the reforming requirements are met.
According to the technical scheme, the method mainly aims at the hot reservoir with low number of cracks or poor connectivity in the main well hole to carry out drilling transformation, the device for drilling and transforming the hot dry rock reservoir is driven by the direction finder to rotate to a preset tool face angle and then is locked, and the drilling track is controlled to face a natural crack development section; the method can avoid the interval of undeveloped cracks in the main borehole, increase the reconstruction volume, reduce the risk of microseisms, and improve the reconstruction effect by being implemented by matching with a chemical stimulation method.
Preferably, in the method for drilling and modifying the dry hot rock reservoir, the fracture distribution of the hot reservoir is evaluated through logging results of imaging logging, dual lateral resistivity logging and acoustic remote detection. The two devices for drilling and reforming the dry hot rock reservoir are adopted according to the fracture distribution condition of the hot reservoir, and have stronger use pertinence and better effect.
According to the technical scheme, compared with the prior art, the device and the method for drilling and modifying the hot dry rock reservoir have the following beneficial effects that:
1. the two devices for drilling and modifying the dry hot rock reservoir and the corresponding methods are adopted according to the distribution condition of the fractures of the hot reservoir, and can be used for respectively drilling and modifying the hot reservoir with low natural fracture development in the main borehole and the hot reservoir with low fracture number or poor connectivity in the main borehole, so that the modification volume can be increased, the microseismic risk can be reduced, and the modification effect can be improved by matching with a chemical stimulation method.
2. The device adopts high-pressure abrasive jet flow to carry out lateral jet rock breaking, communicates the original fractures of the stratum, forms a volume fracture network and reforms a dry and hot rock reservoir; the power driving device of the drilling fluid can be used for rotating or impacting to drive the drill bit to perform directional drilling.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a device for drilling and modifying a dry hot rock reservoir in example 1.
Fig. 2 is a schematic structural diagram of a device for drilling and modifying a hot dry rock reservoir by adopting mud pulse transmission control in example 2.
Fig. 3 is a schematic structural diagram of a device for drilling and modifying a hot dry rock reservoir by cable transmission control according to example 3 of the invention.
Fig. 4 is a schematic diagram of the working state and the external control structure of embodiments 1 to 3 provided by the present invention.
Fig. 5 is a schematic structural diagram of a power nipple driving drilling working state according to embodiments 1 to 3 provided by the invention.
Fig. 6 is a schematic structural diagram of a side injection operating state according to embodiments 1 to 3 of the present invention.
FIG. 7 is a schematic structural view of a lower spray operation state according to embodiments 1 to 3 of the present invention.
Wherein:
1-a drill bit; 2-a micro-pore drilling rig; 3-a power nipple; 4-upper joint; 5-connecting the connector string; 6-coiled tubing; 7-front end nozzle; 8-plugging the column; 9-a spring; 10-a lateral nozzle; 11-a control sleeve; 12-a flow channel; 13-jet mixing and pressurizing equipment; 14-a slurry pump; 15-downhole measurement while drilling tools; 16-an orienter; 17-a downhole thruster; and 18-ground measurement and control equipment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to the attached figure 1, the embodiment of the invention discloses a device for drilling and reforming a dry hot rock reservoir, which comprises: the drilling tool comprises a drill bit 1, a micropore drilling rig 2, a power short section 3, an upper joint 4, a connecting joint string 5 and a continuous oil pipe 6 which are connected in sequence;
the bottom of the drill bit 1 is provided with a plurality of front end nozzles 7; a plugging column 8 is arranged in the center of the interior of the drill bit 1, and a spring 9 is sleeved on the plugging column 8; the micro-hole drilling device 2 is of a cylindrical structure with two open ends, a plurality of lateral nozzles 10 are uniformly distributed on the side wall close to the power nipple 3 in the circumferential direction, and the lateral nozzles 10 are communicated with the interior of the micro-hole drilling device 2; the inner side wall of the micropore drilling device 2 is connected with a control sleeve 11 in a sliding way, the axis of the control sleeve 11 is provided with a flow passage 12, two ends of the flow passage 12 penetrate through the control sleeve 11, and the flow passage 12 corresponds to the plugging column 8; the coiled tubing 6 is connected with a bottom hole assembly consisting of an upper joint 4, a power nipple 3, a micropore drilling rig 2 and a drill bit 1 through a connecting joint string 5.
In order to further optimize the technical scheme, the flow channel 12 is a two-stage stepped hole, and the aperture of the end, facing the power nipple 3, of the flow channel 12 is larger than that of the end, facing the plugging column 8, of the flow channel 12; the aperture of the flow channel 12 facing one end of the plugging column 8 is smaller than the diameter of the plugging column 8.
In order to further optimize the technical scheme, the end face of the plugging column 8 is flush with the end face of the micropore drilling device 2 facing to the direction of the drill bit 1; the length of the control sleeve 11 is smaller than the length of the end face of the micro-hole drilling rig 2 facing the drill bit 1 to the lateral nozzle 10.
In order to further optimize the technical scheme, a jet mixing pressurization device 13 and a slurry pump 14 which can switch the fluid source through a ground manifold are connected to the injection end of the continuous oil pipe 6.
In order to further optimize the technical scheme, the side wall of the micro-hole drilling device 2 is provided with an outer pin hole, and the outer pin hole is positioned between the lateral nozzle 10 and the end face, facing the power nipple 3, of the micro-hole drilling device 2; the side wall of the control sleeve 11 has an inner pin hole corresponding to the outer pin hole.
The method for drilling and modifying the dry hot rock reservoir aims at performing drilling and modification on a hot reservoir with natural fracture development in a main borehole, and comprises the following steps:
s1, after a main well bore is drilled, the device for drilling and modifying the dry hot rock reservoir is put into an interval to be modified, high-pressure abrasive jet is mixed and pressurized on the ground through a jet mixing and pressurizing device 13 and is sent to the microporous drilling rig 2 through a continuous pipe 6, a control sleeve 11 is driven by the high-pressure abrasive jet with large discharge to cut off a pin and then move towards a drill bit 1, so that a blocking column 8 blocks a flow passage 12, the flow passage at a lateral nozzle 10 is opened, and the high-pressure abrasive jet sprays and breaks rock on the well wall of a target interval through the lateral nozzle 10 to form cracks and deepen;
s2, after the step S1 is completed, stopping jetting or reducing jet flow discharge, pushing the control sleeve 11 to reset through the spring 9, blocking the lateral nozzle 10, opening the front end nozzle 7, lifting or lowering the coiled tubing to enable the device for drilling and reforming the dry and hot rock reservoir to reach the next layer section to be reformed, repeating the steps S1 and S2, and gradually completing multi-section reforming of the dry and hot rock reservoir until the reforming requirements are met.
The device for drilling and modifying the dry and hot rock reservoir adopts high-pressure abrasive jet flow to carry out lateral injection rock breaking, communicates the original fractures of the stratum to form a volume fracture network, and modifies the dry and hot rock reservoir; the device for drilling and reforming the dry hot rock reservoir can also be driven to rotate or impact by utilizing the power of the drilling fluid, the drill bit 1 carried at the front end of the device for drilling and reforming the dry hot rock reservoir is driven to perform directional sidetrack drilling, and the structural change in the tool under different working states is shown in figures 5-7.
Example 2:
referring to fig. 2, the present embodiment is improved on the basis of embodiment 1, and further comprises a downhole measurement-while-drilling tool 15, a direction finder 16 and a downhole thruster 17 which are sequentially connected between the upper joint 4 and the connecting joint string 5, and adopts mud pulse transmission control.
In order to further optimize the technical scheme, the ground is also provided with a ground measurement and control device 18 which decodes the data uploaded by the downhole measurement while drilling tool 15 and transmits the technical instruction codes to the direction finder 16 and the downhole propeller 17.
The method for drilling and modifying the dry hot rock reservoir provided by the embodiment is used for drilling and modifying the hot reservoir with low fracture quantity or poor connectivity in the main borehole, and comprises the following steps:
s1, the improved device for drilling and reforming the dry hot rock reservoir is put into a well to log and display a natural fracture development section for directional sidetracking, the high-pressure drilling fluid is used for driving the power nipple 3 to drive the drill bit 1 to carry out rotary or percussion drilling on the dry hot rock reservoir to break rock, a new micro well bore is drilled, a well bottom measurement-while-drilling tool 15 uploads measured well bore track parameters to the ground in the drilling process, the well bottom measurement-while-drilling tool is used for judging whether the orientation is needed or not after being resolved by a ground measurement and control device 18, if the orientation operation of a continuous oil pipe is needed, drilling fluid pressure pulse or a cable signal is generated by the ground measurement and control device 18 to be transmitted downwards to operate the orientator 15, the orientator 15 rotates a tool face angle to a planned position and then;
s2, in the micro branch well drilling process in the step S1, a mud pump 14 pressurizes the drilling fluid and then injects the drilling fluid into the continuous oil pipe 6, the mud enters the drill bit 1 from the flow channel of the control sleeve 11 and is sprayed to the bottom of the well through a front end nozzle 7, and the rock is broken by spraying on the bottom of the side well drilling well;
s3, after the micro branch well bore in the step S1 is drilled, the well entering fluid is switched from the drilling fluid to high-pressure abrasive jet after being mixed and pressurized by a jet mixing and pressurizing device 13 through a ground manifold, the control sleeve 11 is driven to move towards the direction of the drill bit 1 by increasing the jet discharge capacity, so that the blocking column 8 blocks the flow channel 12, the outer side wall of the control sleeve 11 descends to open the flow channel at the lateral nozzle 10, the high-pressure jet is sprayed to the surrounding well wall through the lateral nozzle 10, and the cracks near the target interval are deepened;
s4, after the step S3 is completed, stopping jetting or reducing jet flow discharge, pushing the control sleeve 11 to reset through the spring 9, blocking the lateral nozzle 10, opening the front end nozzle 7, lifting or lowering the coiled tubing 6 to enable the device for drilling and reforming the dry and hot rock reservoir to reach the next layer section to be reformed, repeating the steps S1 and S2, and gradually completing multi-section reforming of the dry and hot rock reservoir until the reforming requirements are met.
In order to further optimize the technical scheme, the thermal reservoir fracture distribution condition is evaluated through the logging results of imaging logging, double lateral resistivity logging and acoustic remote detection.
The ground measurement and control equipment 18 can decode a mud pulse signal or an electric signal uploaded by the downhole measurement-while-drilling tool 15 and provide the decoded signal to a technician, the technician downloads the signal to the direction finder 16 through a cable or a mud pulse according to the direction finding requirement, and the direction finder 16 drives the device for drilling and reforming the hot dry rock reservoir to rotate to a preset tool face angle and then lock, so that the drilling direction is adjusted.
The jet flow mixing and pressurizing device 13 firstly uniformly mixes the jet flow medium and the abrasive, then pressurizes the mixture to be more than 30MPa, pumps the mixture into the well through the continuous oil pipe 6, and flows through a lateral nozzle of the device for drilling and modifying the dry and hot rock reservoir to form abrasive jet flow to impact rock on the well wall, so that a hole with a certain depth is formed.
The near-bottom measurement-while-drilling tool 15 can measure well deviation, azimuth, tool face angle, temperature and other data in real time, and transmit the measured parameters to the ground measurement and control equipment 18 through mud pulse or a downhole cable, and further instructions are issued by ground technicians.
Example 3:
referring to fig. 3, the present embodiment is improved on the basis of embodiment 1, and further comprises a direction finder 16, a downhole measurement-while-drilling tool 15 and a downhole thruster 17 which are connected between the upper connector 4 and the connection connector string 5, and adopts cable transmission control.
Other structures and methods of this embodiment are the same as those of embodiment 2, and are not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An apparatus for drilling a dry hot rock reservoir, comprising: the drilling head (1), the micropore drilling device (2), the power nipple (3), the upper joint (4), the connecting joint string (5) and the coiled tubing (6) are connected in sequence;
a plurality of front-end nozzles (7) are annularly arranged at the bottom of the drill bit (1); a plugging column (8) is arranged in the center of the interior of the drill bit (1), and a spring (9) is sleeved on the plugging column (8); the micro-hole drilling device (2) is of a cylindrical structure with two open ends, a plurality of lateral nozzles (10) are uniformly distributed on the side wall close to the power nipple (3) in the circumferential direction, and the lateral nozzles (10) are communicated with the interior of the micro-hole drilling device (2); a control sleeve (11) is connected to the inner side wall of the micropore drilling device (2) in a sliding mode, a flow passage (12) with two ends penetrating through the control sleeve (11) is formed in the axis of the control sleeve (11), and the flow passage (12) corresponds to the plugging column (8); and the coiled tubing (6) is connected with a bottom drilling assembly consisting of the upper joint (4), the power nipple (3), the micropore drilling device (2) and the drill bit (1) through the connecting joint string (5).
2. A device for drilling and modifying a hot dry rock reservoir as claimed in claim 1, wherein the flow channel (12) is a two-stage stepped bore, and the diameter of the flow channel (12) at the end facing the power sub (3) is larger than that at the end facing the plugging column (8); the aperture of one end of the flow passage (12) facing the plugging column (8) is smaller than the diameter of the plugging column (8).
3. A device for drilling retorted hot dry rock reservoirs according to claim 1, characterized in that the end face of the plugging column (8) is flush with the end face of the micro-porous drill (2) facing the drill bit (1); the length of the control sleeve (11) is less than the length from the end face of the micropore drilling device (2) towards the direction of the drill bit (1) to the lateral nozzle (10).
4. A device for drilling and modifying a hot dry rock reservoir as claimed in claim 1, wherein the injection end of the coiled tubing (6) is connected to a jet mixing and pressurizing apparatus (13) and a mud pump (14) which can switch the fluid source through a surface manifold.
5. A device for drilling retouched hot dry rock formations according to any one of claims 1-4, characterized in that the side wall of the micro-bore drill (2) has an outer pin hole between the lateral nozzle (10) and the end face of the micro-bore drill (2) facing the power sub (3); the side wall of the control sleeve (11) is provided with an inner pin hole corresponding to the outer pin hole.
6. A method for drilling and modifying a dry hot rock reservoir is characterized in that drilling and modifying are carried out on a hot reservoir for the development of natural fractures in a main borehole, and the method comprises the following steps:
s1, after a main well bore is drilled, the device for drilling and reconstructing the dry hot rock reservoir is put into an interval to be reconstructed, the high-pressure abrasive jet is mixed and pressurized through a jet mixing and pressurizing device (13) on the ground, and is sent to a microporous drilling rig (2) through a continuous pipe (6), the high-pressure abrasive jet drives a control sleeve (11) to cut a pin and then moves towards a drill bit (1), so that a blocking column (8) blocks a flow channel (12), the flow channel at a lateral nozzle (10) is opened, and the high-pressure abrasive jet sprays and breaks rocks on the well wall of the target interval through the lateral nozzle (10), so that a crack is formed and deepened;
s2, after the step S1 is completed, stopping jetting or reducing jet flow discharge, pushing the control sleeve (11) to reset by the spring (9), plugging the lateral nozzle (10), opening the front end nozzle (7), lifting or lowering the coiled tubing (6) to enable the device for drilling and reforming the hot dry rock reservoir to reach the next layer section to be reformed, repeating the steps S1 and S2, and gradually completing the multi-section reforming of the hot dry rock reservoir until the reforming requirement is met.
7. An apparatus for drilling a modified hot dry rock reservoir, comprising the apparatus for drilling a modified hot dry rock reservoir according to any one of claims 1 to 5; the device also comprises a bottom-hole measurement-while-drilling tool (15), a direction finder (16) and a downhole propeller (17) which are sequentially connected between the upper connector (4) and the connecting connector string (5), and mud pulse transmission control is adopted; or the device also comprises a direction finder (16), a downhole measurement-while-drilling tool (15) and a downhole thruster (17) which are connected between the upper connector (4) and the connecting connector string (5), and the direction finder is controlled by adopting cable transmission.
8. An apparatus for drilling and reforming a hot dry rock reservoir as defined in claim 7, wherein the surface is further provided with a surface measurement and control device (18) for decoding data uploaded by the downhole measurement-while-drilling tool (15) and encoding and transmitting technical instructions to the direction finder (16) and the downhole thruster (17).
9. A method for drilling and modifying a dry hot rock reservoir is characterized in that drilling and modifying are carried out on a hot reservoir with low fracture quantity or poor connectivity in a main borehole, and the method comprises the following steps:
s1, the device for drilling and reforming the dry hot rock reservoir is put into a well to log and display a natural fracture development section for directional sidetracking, a high-pressure drilling fluid is used for driving a power short section (3) to drive a drill bit (1) to carry out rotary or impact rock breaking on the dry hot rock reservoir, a new tiny borehole is drilled, a measurement tool (15) at the bottom of the well during drilling uploads measured borehole trajectory parameters to the ground, the borehole trajectory parameters are resolved by a ground measurement and control device (18) and then whether the orientation is needed or not is judged, if the orientation operation of a continuous oil pipe (6) is needed, a drilling fluid pressure pulse or a cable signal is generated by the ground measurement and control device (18) to drive the orientator (15) to be operated downwards, the orientator (15) rotates a tool face angle to a planned position and then is locked, and the sliding directional drilling operation is carried out;
s2, in the micro branch well drilling process in the step S1, a mud pump (14) pressurizes drilling fluid, and then injects the drilling fluid into a continuous oil pipe (6), the drilling fluid enters a drill bit (1) from a flow channel of a control sleeve (11), and is sprayed to the bottom of a well through a front-end nozzle (7) to perform spraying and rock breaking on the bottom of the well;
s3, after the micro branch well bore in the step S1 is drilled, the well entering fluid is switched from the drilling fluid to high-pressure abrasive jet after being mixed and pressurized by jet mixing and pressurizing equipment (13) through a ground manifold, the control sleeve (11) is driven to move towards the direction of the drill bit (1) by increasing the jet discharge capacity, so that the blocking column (8) blocks the flow channel (12), the outer side wall of the control sleeve (11) descends to open the flow channel at the lateral nozzle (10), and the high-pressure jet is ejected through the lateral nozzle (10) to deepen the crack near the target interval;
s4, after the step S3 is completed, stopping jetting or reducing jet flow discharge, pushing the control sleeve (11) to reset through the spring (9), blocking the lateral nozzle (10), opening the front end nozzle (7), lifting or lowering the coiled tubing (6) to enable the device for drilling and reforming the hot dry rock reservoir to reach the next layer section to be reformed, repeating the steps S1 and S2, and gradually completing multi-section reforming of the hot dry rock reservoir until the reforming requirements are met.
10. A method of drilling a modified hot dry rock reservoir as claimed in claim 9 wherein the thermal reservoir fracture distribution is assessed by imaging logs, dual lateral resistivity logs, sonic telemetry logs.
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| CN202011380670.2A CN112377106A (en) | 2020-11-30 | 2020-11-30 | Device and method for drilling and modifying hot dry rock reservoir |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011380670.2A CN112377106A (en) | 2020-11-30 | 2020-11-30 | Device and method for drilling and modifying hot dry rock reservoir |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113137209A (en) * | 2021-04-27 | 2021-07-20 | 中国地质科学院勘探技术研究所 | Drilling and injection integrated marine natural gas hydrate reservoir transformation appliance and method |
| CN114482856A (en) * | 2021-12-22 | 2022-05-13 | 中煤科工集团西安研究院有限公司 | Drilling tool combination and method for near-horizontal directional drilling and stuck drilling treatment of complex fractured stratum |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113137209A (en) * | 2021-04-27 | 2021-07-20 | 中国地质科学院勘探技术研究所 | Drilling and injection integrated marine natural gas hydrate reservoir transformation appliance and method |
| CN114482856A (en) * | 2021-12-22 | 2022-05-13 | 中煤科工集团西安研究院有限公司 | Drilling tool combination and method for near-horizontal directional drilling and stuck drilling treatment of complex fractured stratum |
| CN114482856B (en) * | 2021-12-22 | 2023-02-28 | 中煤科工集团西安研究院有限公司 | Drilling tool combination and method for near-horizontal directional drilling and stuck drilling treatment of complex fractured stratum |
| CN114991736A (en) * | 2022-06-30 | 2022-09-02 | 中煤科工集团西安研究院有限公司 | Directional grooving device and coal bed gas vertical well coal reservoir transformation method |
| CN114991736B (en) * | 2022-06-30 | 2024-04-16 | 中煤科工集团西安研究院有限公司 | Directional slotting device and coal bed methane vertical well coal reservoir reconstruction method |
| CN116658143A (en) * | 2023-07-17 | 2023-08-29 | 延长油田股份有限公司七里村采油厂 | Open hole fracturing crack directional opening tool and construction method |
| CN116658143B (en) * | 2023-07-17 | 2023-10-27 | 延长油田股份有限公司七里村采油厂 | Open hole fracturing crack directional opening tool and construction method |
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