CN112412378A - Drilling and plugging operation method for oil pipe of compact oil long horizontal well - Google Patents
Drilling and plugging operation method for oil pipe of compact oil long horizontal well Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000006073 displacement reaction Methods 0.000 claims abstract description 25
- 238000010276 construction Methods 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 238000005086 pumping Methods 0.000 claims abstract description 19
- 238000000227 grinding Methods 0.000 claims description 64
- 239000004576 sand Substances 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 10
- 230000000630 rising effect Effects 0.000 claims description 10
- 238000004904 shortening Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
Abstract
The invention provides a compact oil length horizontal well oil pipe plug drilling operation method, which is characterized in that the running-in length of an oil pipe, namely the bit feeding amount, is controlled based on the pump pressure, the pulling force and the bit feeding amount, and the bit pressure actually loaded on a mill shoe is not considered; after the bit feeding amount is loaded, the pumping displacement is kept, the bit feeding is stopped, and the pumping pressure and the pulling force are recovered to the level P before the bit feeding amount is loaded1One weight-on-bit loading cycle; reloading a bit feed slightly greater than the previous cycle, in response to a higher pump pressure and a lower pull force; keeping the pump injection displacement, stopping bit feeding, and finishing the second bit pressure loading period after the pump pressure and the suspended weight are recovered; and the process is circulated until the bridge plug is drilled and removed. The method comprises n-1 bit pressure loading periods, adopts the oil pipe drilling and plugging operation method of long horizontal well intermittent multi-stage bit feeding and segmented pressurization, and avoidsThe problems of blind drilling, overlarge pressurization and the like greatly improve the construction efficiency of the oil pipe drilling plug operation of the compact oil length horizontal well.
Description
Technical Field
The invention belongs to the technical field of oil pipe drill plug construction, and particularly relates to a compact oil length horizontal well oil pipe drill plug operation method.
Background
The long horizontal well drilling plug bridge plug technology is an indispensable matching technology for a hydraulic pumping bridge plug subsection multi-cluster fracturing process, as a compact oil development horizontal section is long, generally the horizontal section is more than 1500m, a continuous oil pipe cannot be lowered to a preset position, the cost is high, the operation risk is large, meanwhile, the use of continuous oil pipe equipment is limited by regional roads, and the existing oil pipe drilling plug technology has the problems that the drilling pressure of the long horizontal section is difficult to apply, the drilling plug efficiency is low, the risk of sand setting and drilling is large, the sand production amount of the bridge plug drilling plug is large and the like in field application.
The existing long horizontal well oil pipe drilling plug technology mainly has the following characteristics:
one is that weight on bit application cannot be effectively controlled. The pumping pressure and the discharge capacity during the horizontal well drilling plug operation have certain hysteresis compared with the drilling pressure control, unreasonable drilling pressure often causes complex working conditions such as pump building, long horizontal section drilling pressure cannot be measured and calculated specifically, and sometimes a method for controlling the running-in speed and applying the drilling pressure uninterruptedly is adopted for pursuing footage;
secondly, the drill plug pays attention to footage and neglects shaft circulation. Neglecting shaft circulation inevitably leads to unclean shafts, which can cause complex underground drilling plug working conditions and abnormal construction parameters, especially some abnormal construction parameters are difficult to reasonably explain, which often affects construction decision, frequently occurs drill jamming, the pipe column is difficult to run in, and serious sand jamming can lead to underground accidents;
thirdly, the importance of the friction resistance in the drilling and grinding process is insufficient. The compact oil development process mainly adopts a bridge plug staged fracturing process of a long horizontal well, the horizontal section of drilling and plugging operation at the later stage is long, the friction of a pipe column is too large, the pipe column is not easy to be lowered or the drilling and plugging operation efficiency is low, and the drilling and plugging operation cannot be accurately applied after the pipe column is lowered to a position.
Fourthly, the change of the pump pressure in the process of drilling and plugging is generally ignored. The pump pressure is the most direct display of the bottom hole working condition of the horizontal well drilling plug operation, the underground working condition cannot be mastered in time by neglecting the change of the pump pressure, the pump is easy to be held, the pump truck is in overpressure, the hose is twisted, and the like, and the drilling plug construction efficiency is low.
Disclosure of Invention
The invention aims to provide a drilling and plugging operation method for an oil pipe of a compact oil-length horizontal well, which overcomes the technical problems in the prior art.
Therefore, the technical scheme provided by the invention is as follows:
a tight oil length horizontal well oil pipe drilling and plugging operation method is characterized in that an oil pipe is connected with a drilling and milling tool string and is put into a drilling and milling construction well, n-1 drilling pressure loading periods are carried out between a bridge plug top boundary and a bridge plug bottom boundary to drill and remove an in-well bridge plug, the bit feeding amount of the next drilling pressure loading period is larger than that of the previous drilling pressure loading period, and the drilling pressure loading period comprises the following steps:
1) the oil pipe is put into the drill pipe while the pump is injecting, the putting speed of the oil pipe is controlled to be 0.8-1cm/min for fine drill feeding, and when the pump pressure rises to P n Stopping the bit feeding, wherein the bit feeding amount is L n-1 The pulling force is reduced to F n The suspended weight is reduced to T n (ii) a Wherein n represents the number of times of actually measuring the pump pressure on the ground, and the n is a positive integer more than or equal to 3;
2) keeping the pump injection displacement and stopping bit feeding until the pump pressure gradually drops to P n-1 While the tension gradually rises F n-1 The suspended weight gradually increasing to the rising T n-1 。
Before the first weight-on-bit loading period, the method further comprises the following steps:
step 1) testing that the ground drilling and grinding fluid circulating system is qualified, connecting an oil pipe with a drilling and grinding tool string to form a drilling and grinding pipe column, and putting the drilling and grinding pipe column into a drilling and grinding construction well at the speed of 8-10 m/s;
step 2) when the drilling and grinding tool string is lowered to a position 30-50m above a deflecting point, pumping is started with the minimum discharge allowed by a screw drill motor in the drilling and grinding tool string, and pumping is carried out while a single oil pipe is connected to the drilling and grinding tool string;
and 3) after the drilling and grinding tool string enters the horizontal section, increasing the pump injection displacement to the rated maximum displacement of the screw drill motor.
The first weight-on-bit loading cycle procedure was as follows:
(1) pouring while injecting by a pump, stopping pouring after falling to 3-5m above the top boundary of the bridge plug, shortening within the range of 50-100m, lifting and lowering a drilling and grinding pipe column to clean a shaft, stopping shortening after the shaft return fluid is continuous and stable, no sand returns and the pump pressure fluctuation is less than 0.5MPa, connecting a single oil pipe to 2-3m above the top boundary of the bridge plug, and recording the pump pressure at the moment as P1Tensile force of F1；
(2) Feeding the oil pipe stably at the speed of 0.8-1cm/min, marking the position of a well head, pressing and rising the pump after a grinding shoe is abutted to the bridge plug, repeatedly probing for several times, detecting the top boundary position of the bridge plug, and making a record;
(3) it doesAfter the top boundary position of the bridge plug is determined, controlling the running speed of the oil pipe to be 0.8-1cm/min for fine drill feeding, and when the pump pressure rises to P2Stopping the bit feeding, wherein the bit feeding amount is L1The pulling force is reduced to F2Lowering the suspended weight to T2(ii) a (4) Continuously keeping the maximum pump injection displacement and stopping bit feeding until the pump pressure gradually drops to P1While the tension gradually rises F1The suspended weight gradually increasing to the rising T1。
The pump pressure in each weight on bit loading cycle is in accordance with the following relationship:
P1＜P2＜P3＜…＜P n
P1＜P2＜P3＜…＜P n-1
wherein, P n And P1Should be less than the rated maximum pressure drop of the screw drill motor in the drill grinding tool string.
The bit feeding amount in each bit pressure loading period meets the following relation:
Ln-1≥1.1Ln-2
L1＜L2＜L3＜…＜L n-1
L1+L2+L3+…+L n-1=L
wherein L is the continuous length of the bridge plug in the horizontal well.
The tension in each weight on bit loading cycle follows the following relationship:
F1＞F2＞F3＞…＞Fn
F1＞F2＞F3＞…＞Fn-1
suspended weight T n =mF n And m is the number of large strands.
The bridge plug is a shaft sand plug, a rubber plug, an alloy bridge plug, a drillable bridge plug, a composite bridge plug or a cement plug.
The drilling and grinding tool string is formed by connecting an oil pipe joint, a one-way valve, a hydraulic pressurizer, a screw drill and a grinding shoe from top to bottom.
The ground drilling and grinding fluid circulating system comprises a pump truck, a circulating pipeline, a high-low pressure filter, a spiral grit chamber, a chip supplementing device, a hose and a well plugging device which are connected in sequence.
In the step (4), when the pump pressure is lowered and the tension and the suspended weight are not raised, the oil pipe is put down in the shaft with the length ranging from 30m to 50m until the pump pressure is raised to P1The tensile force rises to F1。
The invention has the beneficial effects that:
according to the oil pipe plug drilling operation method for the compact oil long horizontal well, the oil pipe plug drilling operation method for intermittent multi-stage bit feeding and segmented pressurization of the long horizontal well is adopted based on pump pressure, tension (hanging weight) and bit feeding amount, the problems of blind bit feeding, overlarge pressurization and the like are avoided, and the construction efficiency of the oil pipe plug drilling operation of the compact oil long horizontal well is greatly improved.
The following will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a graph of the relationship of bit rate, pump pressure and pull force for each weight on bit loading cycle of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the embodiment provides a compact oil long horizontal well oil pipe plug drilling operation method, wherein an oil pipe is connected with a drilling and grinding tool string and is put into a drilling and grinding construction well, n-1 drilling pressure loading periods are carried out between a bridge plug top boundary and a bridge plug bottom boundary to drill and remove an in-well bridge plug, the bit feeding amount of the next drilling pressure loading period is larger than that of the previous drilling pressure loading period, and the drilling pressure loading period comprises the following steps:
1) the oil pipe is put into the drill pipe while the pump is injecting, the putting speed of the oil pipe is controlled to be 0.8-1cm/min for fine drill feeding, and when the pump pressure rises to P n Stopping the bit feeding, wherein the bit feeding amount is L n-1 The pulling force is reduced to F n The suspended weight is reduced to T n (ii) a Wherein n represents the number of times of actually measuring the pump pressure on the ground, and the n is a positive integer more than or equal to 3;
2) keeping the pump injection displacement and stopping bit feeding until the pump pressure gradually drops to P n-1 While the tension gradually rises F n-1 The suspended weight gradually increasing to the rising T n-1 。
When a plurality of bridge plugs are discontinuously distributed in the horizontal shaft, if a plurality of bridge plugs are set in the shaft, the method aims at a method for drilling out one bridge plug, and other bridge plugs are drilled out by the same method.
The invention adopts the oil pipe drilling plug operation method of long horizontal well intermittent multi-stage bit feeding and segmented pressurization based on the pump pressure, the tension (the hanging weight) and the bit feeding amount, avoids the problems of blind bit feeding, overlarge pressurization and the like, and greatly improves the oil pipe drilling plug operation construction efficiency of the compact oil long horizontal well.
Example 2:
on the basis of embodiment 1, the embodiment provides a method for operating a drill plug of an oil pipe of a tight oil length horizontal well, and before a first weight on bit loading cycle, the method further comprises the following steps:
step 1) testing that the ground drilling and grinding fluid circulating system is qualified, connecting an oil pipe with a drilling and grinding tool string to form a drilling and grinding pipe column, and putting the drilling and grinding pipe column into a drilling and grinding construction well at the speed of 8-10 m/s;
step 2) when the drilling and grinding tool string is lowered to a position 30-50m above a deflecting point, pumping is started with the minimum discharge allowed by a screw drill motor in the drilling and grinding tool string, and pumping is carried out while a single oil pipe is connected to the drilling and grinding tool string;
and 3) after the drilling and grinding tool string enters the horizontal section, increasing the pump injection displacement to the rated maximum displacement of the screw drill motor.
The drilling and grinding tool string is formed by connecting an oil pipe joint, a one-way valve, a hydraulic pressurizer, a screw drill and a grinding shoe from top to bottom.
And (4) inspecting the ground of the drilling and grinding tool to be qualified, completing the series connection of the drilling and grinding tool according to requirements, testing the performance of a screw drill motor, and entering the well after the test is qualified.
Example 3:
on the basis of embodiment 1, the embodiment provides a method for operating a tight oil length horizontal well oil pipe drill plug, wherein the first weight on bit loading cycle process is as follows:
(1) pouring while injecting by a pump, stopping pouring after falling to 3-5m above the top boundary of the bridge plug, shortening within the range of 50-100m, lifting and lowering a drilling and grinding pipe column to clean a shaft, stopping shortening after the shaft return fluid is continuous and stable, no sand returns and the pump pressure fluctuation is less than 0.5MPa, connecting a single oil pipe to 2-3m above the top boundary of the bridge plug, and recording the pump pressure at the moment as P1Tensile force of F1；
(2) Feeding the oil pipe stably at the speed of 0.8-1cm/min, marking the position of a well head, pressing and rising the pump after a grinding shoe is abutted to the bridge plug, repeatedly probing for several times, detecting the top boundary position of the bridge plug, and making a record;
(3) after determining the top boundary position of the bridge plug, controlling the running speed of the oil pipe to be 0.8-1cm/min for fine drill feeding, and when the pump pressure rises to P2Stopping the bit feeding, wherein the bit feeding amount is L1The pulling force is reduced to F2Lowering the suspended weight to T2(ii) a (4) Continuously keeping the maximum pump injection displacement and stopping bit feeding until the pump pressure gradually drops to P1While the tension gradually rises F1The suspended weight gradually increasing to the rising T1。
Example 4:
on the basis of the embodiment 1, 2 or 3, the embodiment provides a method for operating a drilling plug of a compact oil length horizontal well oil pipe, which comprises the following steps:
the method comprises the following steps: sequentially connecting a pump truck, a circulating pipeline, a high-low pressure filter, a spiral sand setting tank, a chip replenishing device, a hose and a well plugging device to form a ground drilling and grinding fluid circulating system, testing the circulating system, and preparing for connecting oil pipe drilling and grinding tools in series after the circulating system is qualified;
step two: the ground of the drilling and grinding tool is inspected to be qualified, the oil pipe joint, the one-way valve, the releasing tool, the reverse circulation valve, the hydraulic pressurizer, the screw drill motor and the grinding shoe are connected from top to bottom according to requirements to form a drilling and grinding tool string, the performance of the screw drill motor is tested, and the drilling and grinding tool can enter a well after being tested to be qualified;
step three: after the oil pipe is connected with a drilling and grinding tool string according to requirements, the drilling and grinding construction well is put into the drilling and grinding construction well, the speed in the putting process is not easy to be too high (8-10 m/s), when the tool string is put to be 30-50m above a deflecting point, pumping is started by using a screw drill motor to allow the minimum displacement (300L/min), and the single drilling is carried out while the pumping is carried out;
step four: after the drilling and grinding tool string enters the horizontal section, the pump injection displacement is rapidly increased to the rated maximum displacement of a motor (the dense oil is usually 800L/min) within 2-3 s;
step five: stopping descending after the distance is 3-5m above the top boundary of the bridge plug, lifting and descending a drilling and grinding pipe column within the range of 50-100m, cleaning a shaft, stopping lifting after the shaft return discharge liquid is continuous and stable, no sand returns and the pump pressure fluctuation is less than 0.5MPa, connecting a single oil pipe, stably descending the oil pipe to the distance 2-3m above the top boundary of the bridge plug, and recording the pump pressure P at the moment1Tensile force of F1Suspended weight T1The hanging weight is the multiple of the pulling force, the multiple is the number of actual large ropes on site, generally 8 ropes, and the hanging weight T1Is 8F1；
Step six: feeding an oil pipe (0.8-1 cm/min) at a low speed stably, marking the position of a well head, when a grinding shoe is abutted to a bridge plug, obviously increasing the pump pressure (increasing by 3-5 MPa), repeatedly trying for several times, detecting the top boundary position of the bridge plug, and making a record;
step seven: after determining the top boundary position of the bridge plug, strictly controlling the running speed (0.8-1 cm/min) of the oil pipe, performing fine drill feeding when the process is required to be stable and slow, and when the pump pressure rises to P2Stopping the bit feeding, wherein the bit feeding amount is L1The pulling force is reduced to F2I.e. lowering of the suspended weight to T2（T2=8F2）；
Step eight: continuously keeping the maximum pump injection displacement and stopping bit feeding until the pump pressure gradually drops to P1While the tension gradually rises F1 ，I.e. the hanging weight gradually rises to T1；
Step nine: after the pumping pressure and the pulling force (suspended weight) are stable, the drilling is carried out by slowly controlling the lowering speed (0.8-1 cm/min) of the oil pipe, and when the pumping pressure rises to P3Stopping the bit feeding, wherein the bit feeding amount is L2The pulling force is reduced to F3I.e. lowering of the suspended weight to T3（T3=8F3）；
Step ten: continuously keeping the pump injection displacement and stopping bit feeding until the pump pressure gradually drops to P2The tension gradually rises F2I.e. the suspended weight gradually rises to T2（T2=8F2）；
Step eleven: the method as in the seventh step, the drilling is carried out by slowly controlling the running speed of the oil pipe, when the pump pressure rises to PnStopping the bit feeding, wherein the bit feeding amount is Ln-1The pulling force is reduced to FnLowering the suspended weight to Tn（Tn=8Fn）；
Step twelve: the method of step eight, continuously keeping the maximum pumping capacity and stopping the bit feeding until the pumping pressure gradually drops to Pn-1While the suspended weight gradually rises to Tn-1Drilling to the bottom boundary of the bridge plug;
step thirteen: according to the method of the fifth step to the twelfth step, continuing to drill down the bridge plug according to the requirement, controlling the running speed of the pipe column, and drilling to remove the rest bridge plug in the well;
fourteen steps: and after the bridge plug drill is removed, continuing connecting a single piece and putting the single piece into the oil pipe to the designed depth (artificial well bottom), in the putting-in process, when the pipe column is not easy to put in, shortening the pipe column, keeping the pump injection discharge capacity, flushing until the returned liquid almost has no sand grains, allowing the single piece to be put in, and after sand flushing is completed, pulling out the oil pipe and the drilling plug tool pipe string, stopping pump injection.
The pump pressure in the step eight is gradually reduced to P1While the tension gradually rises to F1(suspended weight T)1) If the pump pressure is reduced and the pulling force (the hanging weight) is increased, the condition is abnormal. At the moment, the drilling is not needed to be carried out urgently, and the oil pipe is put down in the shaft with the length ranging from 30m to 50m until the pump pressure is recovered to P1The tension is recovered to F1(recovery of suspended weight to T1) And finally, performing the construction content in the step nine.
Among these, bridge plugs are typically: well bore sand plug, rubber plug, alloy bridge plug, drillable bridge plug, composite bridge plug, cement plug, etc.
The construction method provided by the embodiment is mainly characterized in that an oil pipe drilling and plugging operation method for intermittent multi-stage bit feeding and segmented pressurization of the long horizontal well is adopted based on pump pressure, tension (hanging weight) and bit feeding amount.
The construction method specifically comprises the steps of controlling the running-in length of the oil pipe, namely the drilling amount, according to the changes of the pump pressure and the tension (the hanging weight), and no matter the drilling pressure actually loaded on the grinding shoe; after the bit feeding amount is loaded, the pumping displacement is kept, the bit feeding is stopped, and the pumping pressure and the pulling force (the suspended weight) are recovered to the level P before the bit feeding amount is loaded1One weight-on-bit loading cycle; reloading a bit greater than the previous cycle in response to a higher pump pressure and a lower pull (weight in suspense); keeping the pump injection displacement, stopping bit feeding, and finishing the second bit pressure loading period after the pump pressure and the suspended weight are recovered; and the process is circulated until the bridge plug is drilled and removed. The construction method for the long horizontal well oil pipe drilling plug operation comprises n-1 drilling pressure loading periods.
As shown in fig. 1, the pump pressure during each weight-on-bit loading cycle satisfies the following relationship:
P1＜P2＜P3＜…＜P n
P1＜P2＜P3＜…＜P n-1
wherein, P n And P1Should be less than the rated maximum pressure drop of the screw drill motor in the drill grinding tool string.
The bit feeding amount in each bit pressure loading period meets the following relation:
Ln-1≥1.1Ln-2
L1＜L2＜L3＜…＜L n-1
L1+L2+L3+…+L n-1=L
wherein L is the continuous length of the bridge plug in the horizontal well.
The tension in each weight on bit loading cycle follows the following relationship:
F1＞F2＞F3＞…＞Fn
F1＞F2＞F3＞…＞Fn-1
suspended weight T n =mF n And m is the number of large strands.
Pump pressure P in step five1And a pulling force F1(suspended weight T)1) The method is the ground actual measurement pump pressure and the suspended load when the working fluid performance is stable, the pump injection displacement is stable, the shaft is clean and has no impurities such as sand setting and the like, the liquid return is continuous and stable, and the drilling and plugging tool is positioned in the shaft 3-5m above the top boundary of the bridge plug. Bit feed amount L1The running length and the bit feeding amount L of the coiled tubing measured for the ground1Should be less than 1 cm; pump pressure P2And a pulling force F2(suspended weight T)2) Is the measured value of the ground.
Example 5:
on the basis of the embodiment 1, the embodiment takes the drilling and plugging operation of a long horizontal well in the dense oil demonstration area of the Changqing oilfield country as an example, and further specifically describes the method.
The diameter of the well production casing is 124.26mm, the length of the horizontal section is 2000m, 20 drillable bridge plugs are designed at different positions in the horizontal section, the length of each drillable bridge plug is about 65cm, and the average distance between the bridge plugs is 80-100 m. An oil pipe combination with the outer diameter of 88.90mm and 73.02mm is adopted for drilling and plugging, and the drilling and plugging tool combination consists of a core tool hydraulic pressurizer, a screw drilling motor, a three-edge flat-bottom grind shoe and other auxiliary tools.
The combined oil pipe is put in, the putting-in speed and the pump injection displacement are controlled according to requirements, the position of a No. 1 bridge plug is detected, after the position is detected, the oil pipe is lifted for 30m (3 oil pipes are lifted), and a shaft is cleaned until the returned liquid is continuous and stable, no sand grains exist, and the pump pressure fluctuation is less than 0.5 MPa; connecting the single joint, and continuously lowering the oil pipe to a position 3-5m above the plug surface, wherein the pump pressure is 12MPa, the tension is 3t (the hanging weight is 24 t), and the discharge capacity is 800L/min; after the bridge plug position is actually detected and confirmed, drilling and plugging are started; steadily lowering the coiled tubing at the speed of 0.8-1cm/min, stopping drilling when the pump pressure rises to 14.5MPa, the tension drops to 2.8t (the suspended weight is 22.6 t) and the drilling quantity reaches 2cm, and keeping the pump injection displacement drilling plug of 800L/min; after 2min, the pump pressure is reduced to 12.2MPa, and meanwhile, the tension is increased to 3.03t (the suspended weight is 24.24 t); and maintaining the construction displacement of the pump, observing the pressure change and the tension change of the pump, and checking the condition of the returned liquid.
Through observation for 1min, the pumping pressure and the suspended weight are stable. According to the method, the drilling is continued, the drilling amount is increased to 4cm, the pump pressure is controlled not to exceed 16.5MPa after rising, and the tension is controlled not to fall below 2.6t (the suspended weight is 20.8 t). After 4min of plugging, the pump pressure and the pulling force are respectively recovered to 11.9MPa and 2.95 t.
The # 1 drillable bridge plugs were drilled out for 46min through 18 loading stages as described above.
And (3) drilling the No. 2-20 drillable bridge plug according to the method for drilling the No. 1 bridge plug.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (10)
1. A compact oil length horizontal well oil pipe drilling plug operation method is characterized by comprising the following steps: the method comprises the following steps that an oil pipe is connected with a drilling and grinding tool string and is put into a drilling and grinding construction well, n-1 drilling pressure loading periods are carried out between a bridge plug top boundary and a bridge plug bottom boundary to drill and remove an in-well bridge plug, the bit feeding amount of the next drilling pressure loading period is larger than that of the previous drilling pressure loading period, and the drilling pressure loading period comprises the following steps:
1) the oil pipe is put into the drill pipe while the pump is injecting, the putting speed of the oil pipe is controlled to be 0.8-1cm/min for fine drill feeding, and when the pump pressure rises to P n Stopping the bit feeding, wherein the bit feeding amount is L n-1 The pulling force is reduced to F n The suspended weight is reduced to T n (ii) a Wherein n represents the number of times of actually measuring the pump pressure on the ground, and the n is a positive integer more than or equal to 3;
2) keeping the pump injection displacement and stopping bit feeding until the pump pressure gradually drops to P n-1 While the tension gradually rises F n-1 The suspended weight gradually increasing to the rising T n-1 。
2. The method for operating the oil pipe drill plug of the tight oil long horizontal well according to claim 1, which is characterized by comprising the following steps: before the first weight-on-bit loading period, the method further comprises the following steps:
step 1) testing that the ground drilling and grinding fluid circulating system is qualified, connecting an oil pipe with a drilling and grinding tool string to form a drilling and grinding pipe column, and putting the drilling and grinding pipe column into a drilling and grinding construction well at the speed of 8-10 m/s;
step 2) when the drilling and grinding tool string is lowered to a position 30-50m above a deflecting point, pumping is started with the minimum discharge allowed by a screw drill motor in the drilling and grinding tool string, and pumping is carried out while a single oil pipe is connected to the drilling and grinding tool string;
and 3) after the drilling and grinding tool string enters the horizontal section, increasing the pump injection displacement to the rated maximum displacement of the screw drill motor.
3. The method for operating the oil pipe plug of the tight oil long horizontal well according to the claim 1 or 2, wherein the first weight on bit loading cycle process is as follows:
(1) pouring while injecting by a pump, stopping pouring after falling to 3-5m above the top boundary of the bridge plug, shortening within the range of 50-100m, lifting and lowering a drilling and grinding pipe column to clean a shaft, stopping shortening after the shaft return fluid is continuous and stable, no sand returns and the pump pressure fluctuation is less than 0.5MPa, connecting a single oil pipe to 2-3m above the top boundary of the bridge plug, and recording the pump pressure at the moment as P1Tensile force of F1；
(2) Feeding the oil pipe stably at the speed of 0.8-1cm/min, marking the position of a well head, pressing and rising the pump after a grinding shoe is abutted to the bridge plug, repeatedly probing for several times, detecting the top boundary position of the bridge plug, and making a record;
(3) after determining the top boundary position of the bridge plug, controlling the running speed of the oil pipe to be 0.8-1cm/min for fine drill feeding, and when the pump pressure rises to P2Stopping the bit feeding, wherein the bit feeding amount is L1The pulling force is reduced to F2Lowering the suspended weight to T2(ii) a (4) Continuously keeping the maximum pump injection displacement and stopping bit feeding until the pump pressure gradually drops to P1While the tension gradually rises F1The suspended weight gradually increasing to the rising T1。
4. The method for operating the oil pipe plug of the tight oil long horizontal well according to claim 1, wherein the pump pressure in each bit pressure loading period meets the following relationship:
P1＜P2＜P3＜…＜P n
P1＜P2＜P3＜…＜P n-1
wherein, P n And P1Should be less than the rated maximum pressure drop of the screw drill motor in the drill grinding tool string.
5. The method for operating the oil pipe plug of the tight oil long horizontal well according to claim 1, wherein the bit delivery amount in each bit pressure loading period meets the following relationship:
Ln-1≥1.1Ln-2
L1＜L2＜L3＜…＜L n-1
L1+L2+L3+…+L n-1=L
wherein L is the continuous length of the bridge plug in the horizontal well.
6. The method for operating the oil pipe plug of the tight oil long horizontal well according to claim 1, wherein the tension in each weight on bit loading period meets the following relationship:
F1＞F2＞F3＞…＞Fn
F1＞F2＞F3＞…＞Fn-1
suspended weight T n =mF n And m is the number of large strands.
7. The method for operating the oil pipe drill plug of the tight oil long horizontal well according to claim 1, which is characterized by comprising the following steps: the bridge plug is a shaft sand plug, a rubber plug, an alloy bridge plug, a drillable bridge plug, a composite bridge plug or a cement plug.
8. The method for operating the oil pipe drill plug of the tight oil long horizontal well according to claim 1, which is characterized by comprising the following steps: the drilling and grinding tool string is formed by connecting an oil pipe joint, a one-way valve, a hydraulic pressurizer, a screw drill and a grinding shoe from top to bottom.
9. The method for operating the oil pipe drill plug of the tight oil long horizontal well according to claim 2, characterized by comprising the following steps: the ground drilling and grinding fluid circulating system comprises a pump truck, a circulating pipeline, a high-low pressure filter, a spiral grit chamber, a chip supplementing device, a hose and a well plugging device which are connected in sequence.
10. The tight oil length horizontal well oil pipe drilling and plugging operation method according to claim 3, characterized in that: in the step (4), when the pump pressure is lowered and the tension and the suspended weight are not raised, the oil pipe is put down in the shaft with the length ranging from 30m to 50m until the pump pressure is raised to P1The tensile force rises to F1。
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