CN112065296A - Well completion operation method combining fine pressure control technology - Google Patents
Well completion operation method combining fine pressure control technology Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000005516 engineering process Methods 0.000 title claims abstract description 28
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 4
- 230000035699 permeability Effects 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 46
- 238000005553 drilling Methods 0.000 claims description 27
- 238000012360 testing method Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 3
- 230000002028 premature Effects 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 11
- 230000004888 barrier function Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 210000002445 nipple Anatomy 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011435 rock Substances 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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Abstract
The invention provides a well completion operation method combined with a fine pressure control technology. The method aims at the problems that the porosity is more than 4%, the permeability is 0.12-0.4K/mD, and the leakage is more than 3m3The fracture-cavity carbonate reservoir is realized by an integrated tubular column, the tubular column comprises a temporary plugging tubular column and a well completion tubular column, wherein the temporary plugging tubular column comprises a fine pressure control device, a drill rod, a first packer and a temporary plugging ball seat, and the fine pressure control device is connected with the drill rod through a wellhead device; a first packer andthe lower parts of the drill rods are connected and can be released; the temporary plugging ball seat is connected with the lower end of the first packer; the well completion pipe column comprises an oil pipe, an underground safety valve, a second packer and a back-plugging joint, wherein the upper end of the oil pipe is connected with a well head, the underground safety valve is arranged on the oil pipe, the second packer is connected with the oil pipe, and the back-plugging joint is positioned below the second packer. The invention has the advantages of reducing the times of well killing and leakage plugging of the shaft, protecting the oil and gas reservoir, reducing the well control risk during well completion and the like.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a well completion operation method combining a fine pressure control technology.
Background
For karst cave fractured formations, malignant lost circulation is easily generated in the drilling and completion stage, and the drilling fluid and the completion fluid are extremely sensitive, so that the lost circulation is determined by one more time and the blowout is determined by one less time; the fine pressure control drilling technology is the mainstream direction of the current pressure control technology of the drilling engineering. The method is mainly used for solving the underground complex conditions of well leakage, well kick and the like caused by a narrow safe density window, a multi-pressure system, a pressure sensitive stratum and an uncertain pressure system in the deep well drilling. The technology is combined with corresponding key equipment to perform dynamic management and accurately adjust the well bore annular pressure profile, and the well bore annular pressure profile is ensured to be in a safety window.
The conventional method for well completion of the reservoir stratum is to dismantle a fine pressure control device, realize dynamic balance in a well by using a hoisting and filling method, and put in a test or well completion pipe string to realize the aim of oil testing and well completion under the balanced state, and the method has the disadvantages that the risk of well control is overlarge during the test and the drilling, the liquid level in the well bore must be monitored at any time, the hoisting and filling amount is adjusted at any time, once the dangerous condition occurs, the well is controlled by the test and the well completion pipe string in the well bore, the treatment is very complicated, the well completion pipe string is put in the well completion pipe string at the later stage to carry out air-tight detection one by one, the operation period is longer, the difficulty of controlling the risk of well control is increased, in addition, after the packer is put in place, the annular protection liquid needs to be replaced, the amount of the annular protection liquid cannot be accurately measured because the stratum is always in a leakage state, the pressure, and the liquid replacement and seat sealing processes cannot be implemented at all.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, the invention aims to provide a well completion operation method which combines a fine pressure control technology and realizes temporary plugging and well completion development by running a temporary plugging string and a well completion string for two times without using liquid to realize temporary plugging.
To achieve the above objects, the present invention provides a method of completion operations incorporating fine pressure control techniques. The well completion operation method aims at the problems that the porosity is more than 4%, the permeability is 0.12-0.4K/mD, and the leakage rate during drilling exceeds 3m3The completion operation method is realized by a test oil and completion integrated tubular column combined with a fine pressure control technology, the integrated tubular column comprises a temporary plugging tubular column and a completion tubular column, wherein the temporary plugging tubular column comprises a fine pressure control device, a drill rod, a first completion packer and a temporary plugging ball seat, and the fine pressure control device is connected with the drill rod through a wellhead deviceThe upper ends of the fine pressure control devices are connected, the fine pressure control devices can automatically monitor the liquid level height and pressure in the shaft annulus, adjust the grouting amount in real time and maintain the pressure balance in the well; the upper end part of the first completion packer is connected with the lower end part of the drill rod, and the upper end part of the first completion packer can be separated from the lower end part of the drill rod by releasing; the upper end of the temporary plugging ball seat is connected with the lower end of the first completion packer through an oil pipe, and the lower end of the temporary plugging ball seat is communicated with the underground space; under the condition that the first completion packer is sealed by pressurization, the temporary plugging string can temporarily plug the formation space and pull out a drill pipe at the upper part of the first completion packer; the well completion pipe column comprises an oil pipe, a downhole safety valve, a second well completion packer and a back-plugging joint, wherein the upper end of the oil pipe is connected with a wellhead device, the downhole safety valve is arranged on the oil pipe, the second well completion packer is connected with the lower end of the oil pipe, the back-plugging joint is connected with the lower end of the second well completion packer through a pipeline, and the back-plugging joint can be matched with the upper end of the first well completion packer to realize back plugging; under the condition that the second completion packer is sealed by pressurization, after the seal is tested to be qualified, continuously pressurizing and driving the temporary plugging ball seat to communicate the stratum; and the well completion operation method may comprise the steps of: a temporary plugging tubular column is put in, and a fine pressure control device is utilized to monitor the liquid level of the annulus and automatically compensate the liquid level; after the penetration depth of the temporary plugging pipe column exceeds the height of the liquid level of the annulus, slurry is poured into the oil pipe from the lower side of the temporary plugging pipe column; after the temporary plugging tubular column is put in place, monitoring the liquid level of the annulus by using a fine pressure control device, calculating the pressure difference, and pressurizing the interior of an oil pipe step by step to seal a first completion packer so as to realize temporary plugging of the oil sleeve and pull out of a drill rod; putting a well completion pipe string, and replacing clear water and annular protection liquid; and after the back plugging is in place, pressurizing step by step from the oil pipe to seal the second completion packer, and pressurizing to remove the temporary plugging ball seat to communicate the stratum after the seal is tested to be qualified.
In an exemplary embodiment of the invention, the first completion packer upper end may be provided with an anchor seal, and the drill pipe is rotated forward and backward to release the anchor seal from the first completion packer.
In an exemplary embodiment of the invention, the completion string may be a conventional completion string having a back-stab sub disposed at its lower end.
In an exemplary embodiment of the invention, the running completion string may include the steps of: and (3) sealing the oil pipe one by one during the running process, trying to insert again, lengthening the length, and running into the underground safety valve until the insert is in place.
In an exemplary embodiment of the invention, the temporary plugging ball seat can be fixed by a pin, and the shear pressure of the pin is at least 15MPa higher than the larger setting pressure of the setting pressures of the first completion packer and the second completion packer, so that the phenomenon of releasing in advance is avoided.
In an exemplary embodiment of the invention, the integrated tubular column further comprises a spare setting nipple which is arranged between the back-plugging joint and the second completion packer and can perform plugging under the condition that the temporary plugging ball seat is released in advance, so that the setting success rate of the second completion packer is improved.
In an exemplary embodiment of the present invention, the fine pressure control device may include an automatic throttle control system and a back pressure compensation system, wherein,
the automatic throttling control system is used for shaft emergency safety control during the running of a well completion pipe string, and the back pressure compensation system can automatically perform grouting according to the leakage liquid level to maintain the balance in the well.
In an exemplary embodiment of the present invention, the temporary plugging ball seat may be a blind ball seat.
Compared with the prior art, the beneficial effects of the invention can comprise at least one of the following:
(1) the conventional well completion operation pipe column is subject to various restrictions under implementation conditions in the well completion of a stratum with easy leakage or large leakage of a crack karst cave, especially, the monitoring and control of the annular space liquid level basically depends on manpower, once a shaft is complicated, the treatment is extremely inconvenient, the well control risk in the whole drilling process is high, the well completion operation method combining the fine pressure control technology greatly reduces the risk by using the original fine pressure control device, the pipe column is temporarily blocked for the first time by a drill rod, the drilling time is shortened, the control strength of the annular space liquid level during the drilling is improved, and the well control safety is ensured;
(2) in the well completion operation method combining the fine pressure control technology, the setting and setting releasing operation of the first tubular column is simple and quick, a temporary plugging barrier of the shaft is established in a short time, and a good condition is created for secondary back plugging, so that the secondary back plugging well completion tubular column is put in when the shaft is in a completely stable and controllable state, and conditions are provided for air sealing and annular space protection liquid replacement when the well completion tubular column is put in;
(3) the difficulty of completion of the stratum with the crack karst cave easy to leak is overcome by utilizing the fine pressure control device, the blind injection amount is reduced, the control of the shaft condition in the whole well completion process is established on the basis of scientific monitoring, and the problems of early releasing, inaccurate replacement fluid leakage metering and the like are avoided.
Drawings
FIG. 1 illustrates a schematic diagram of a diverting string used in a completion operation method incorporating fine control pressure technology in accordance with an exemplary embodiment of the present invention;
FIG. 2 illustrates a schematic diagram of a completion string after back-plugging used in a completion operation method incorporating fine control pressure technology in accordance with an exemplary embodiment of the present invention.
The reference numerals are explained below:
1-wellhead device, 2-drill pipe, 3-casing pipe, 4-temporary plugging ball seat, 5-first completion packer, 6-fine pressure control device, 7-downhole safety valve, 8-oil pipe, 9-second completion packer and 10-back-plugging joint.
Detailed Description
Hereinafter, the completion operation method incorporating fine pressure control technology of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
In general, the completion string is lowered by one time after the fine pressure control technology is implemented on the fractured and caverned stratum: the inventor proposes to extend the fine pressure control technology to the well completion engineering, to put in a once temporary plugging tubular column under the safe condition through a fine pressure control device on the original drilling machine, to quickly establish a shaft safety barrier, to utilize a secondary well completion tubular column to realize the well completion target by utilizing the two tubular columns, thereby reducing the well killing and leaking times and the leaking quantity of the shaft, protecting the oil and gas reservoir and simultaneously reducing the well control risk during the well completion, the method is particularly suitable for the easily-leaked high-yield reservoir stratum such as a carbonate rock fracture karst cave type stratum.
FIG. 1 illustrates a schematic diagram of a diverting string used in a completion operation method incorporating fine control pressure technology in accordance with an exemplary embodiment of the present invention; FIG. 2 illustrates a schematic diagram of a completion string after back-plugging used in a completion operation method incorporating fine control pressure technology in accordance with an exemplary embodiment of the present invention.
In an exemplary embodiment of the invention, a completion operation method combined with a fine pressure control technology aims at the porosity of more than 4%, the permeability of 0.12-0.4K/mD and the leakage rate of more than 3m during drilling3The completion operation method is realized by a test oil completion integrated tubular column combined with a fine pressure control technology. In particular, fracture-cavity reservoirs are the main type of fracture-cavity carbonate reservoirs, and the reservoirs have strong heterogeneity of fractures and cavities and are easy to leak during drilling and subsequent oil testing and well completion operations.
The integrated pipe string comprises a temporary plugging pipe string and a well completion pipe string. The temporary plugging tubular column comprises a fine pressure control device, a drill rod, a first well completion packer and a temporary plugging ball seat, wherein the fine pressure control device is connected with the upper end of the drill rod through a wellhead device, and can automatically monitor the liquid level height and pressure in the shaft annulus, adjust the grouting amount in real time and maintain the pressure balance in the well; the upper end part of the first completion packer is connected with the lower end part of the drill rod, and the upper end part of the first completion packer can be separated from the lower end part of the drill rod by releasing; the upper end of the temporary plugging ball seat is connected with the lower end of the first completion packer through an oil pipe, and the lower end of the temporary plugging ball seat is communicated with the underground space; in the case where the first completion packer is set under pressure, the temporary plugging string can temporarily plug the formation space and trip out the drill pipe above the first completion packer. Specifically, as shown in fig. 1, the fine pressure control device 6 is a fine pressure control device on the original drilling machine, and is not removed after the drilling is completed. For example, the fine pressure control device may include an automatic choke control system (ACS) for wellbore emergency safety control during run in of the completion string and a Back Pressure Compensation System (BPCS) that automatically injects the fluid according to the leakage fluid level to maintain well balance.
The fine pressure control device 6 is connected with the wellhead device 1, and the wellhead device 1 is fixedly connected with the upper end of the drill rod 2. The lower end of the drill pipe 2 is in lost-hand connection with a first completion packer 5. The upper end of the temporary plugging ball seat 4 is fixedly connected with the lower end of the first completion packer 5 through a section of oil pipe. Here, the temporary plugging ball seat 4 may be a blind ball seat. However, the present invention is not limited thereto, and other ball seats having the same function may be used.
The drill pipe 2, the first completion packer 5 and the temporary plugging ball seat 4 are all run into the casing 3. During oil testing, the drill rod 2 is pressurized, the first completion packer 5 is fixed with the casing 3 in a seat sealing mode, and therefore casing temporary plugging shielding can be formed, and stratum space is plugged. Here, the upper end of the first completion packer 5 and the lower end of the drill pipe 2 are of a throwable construction. For example, the first completion packer 5 may be provided with an anchor seal at its upper end, and the drill pipe 2 is rotated forward and backward to release the anchor seal from the first completion packer 5.
The well completion pipe column comprises an oil pipe, a downhole safety valve, a second well completion packer and a back-plugging joint, wherein the upper end of the oil pipe is connected with a wellhead device, the downhole safety valve is arranged on the oil pipe, the second well completion packer is connected with the lower end of the oil pipe, the back-plugging joint is connected with the lower end of the second well completion packer through a pipeline, and the back-plugging joint can be matched with the upper end of the first well completion packer to realize back plugging; and under the condition that the second completion packer is set by pressurization, after the seal is qualified, continuously pressurizing and driving the temporary plugging ball seat to communicate the stratum. As shown in FIG. 2, the completion string includes tubing 8, a downhole safety valve 7, a second completion packer 9, and a stab sub10. The upper end of tubing 8 is connected to a wellhead to raise and lower the completion string. The lower end of the oil pipe 8 is fixedly connected with the upper end of a second completion packer 9, and the lower end part of the second completion packer 9 is connected with a back-plugging joint 10 through a section of oil pipe. Here, the completion string may be a conventional completion string provided with a back-stab connection 10 at its lower end. And when setting is carried out, the second completion packer 9 is set by gradually pressing the interior of the oil pipe 8, and after the seal is tested to be qualified, the temporary plugging ball seat 4 is continuously pressed to be punched to communicate with the bottom of the well. Here, the temporary plugging ball seat can be fixed by using a pin, and the shearing pressure P of the pinzThe larger setting pressure of the setting pressures of the first completion packer and the second completion packer is at least 15MPa, so that the prior releasing is avoided.
In the exemplary embodiment, the integrated tubular column may further include a spare setting nipple, which is disposed between the back-plugging joint and the second completion packer and can perform plugging under the condition that the temporary plugging ball seat is released in advance, so as to improve the setting success rate of the second completion packer. Here, reserve setting nipple joint is equivalent to reserve setting ball seat, can provide reserve setting function when temporary block ball seat is released in advance because of circumstances such as accident, improves the setting success rate of second completion packer.
In this embodiment, the completion operation method may include the steps of: a temporary plugging tubular column is put in, and a fine pressure control device is utilized to monitor the liquid level of the annulus and automatically compensate the liquid level; after the penetration depth of the temporary plugging pipe column exceeds the height of the liquid level of the annulus, slurry is poured into the oil pipe from the lower side of the temporary plugging pipe column; after the temporary plugging tubular column is put in place, monitoring the liquid level of the annulus by using a fine pressure control device, calculating the pressure difference, and pressurizing the interior of an oil pipe step by step to seal a first completion packer so as to realize temporary plugging of the oil sleeve and pull out of a drill rod; specifically, after drilling is completed, a temporary plugging tubular column is put into the well without removing a fine pressure control device by adopting a drill rod, a first well completion packer and a temporary plugging ball seat tubular column structure; after the oil sleeve is put in place, grasping the liquid level of the annular space by using a monitoring system of a fine pressure control device, calculating the pressure difference, and pressurizing the inside of the oil pipe step by step to realize seat sealing, thereby finally realizing temporary plugging of the oil sleeve; and forward rotating and backward opening the upper anchoring seal of the first completion packer and taking out the drill pipe. The whole-course automatic monitoring annulus liquid level of equipment is equipped in meticulous accuse pressure to whole in-process of going down, and the automatic compensation liquid level, well control risk is controllable, and the drilling rod makes up into stand running string simultaneously, has practiced thrift the time, and relative original well completion tubular column, the time of going down has practiced thrift 1/2 ~ 2/3, has reduced the input, and the degree of depth of going down surpasss the liquid level height after, the mud is gone into to the oil pipe in the limit.
Putting a well completion pipe string, and replacing clear water and annular protection liquid; and after the back plugging is in place, pressurizing step by step from the oil pipe to seal the second completion packer, and pressurizing to remove the temporary plugging ball seat to communicate the stratum after the seal is tested to be qualified. Specifically, a completion string is run in accordance with conventional completion string configurations. The running completion string may include the steps of: and (3) sealing the oil pipe one by one during the running process, trying to insert again, lengthening the length, and running into the underground safety valve until the insert is in place. And (3) progressively pressurizing from the interior of the oil pipe to seal the second completion packer, checking the seal of the second completion packer after the seal is made, and continuously pressurizing from the interior of the oil pipe to remove the temporary plugging ball seat after the seal is qualified, so as to communicate the space of the underground production zone.
The difference between the well completion operation method combining the fine pressure control technology and the original oil testing well completion method is as follows:
the structure of the original well completion pipe column is as follows: ball seat, hydraulic well completion packer, oil pipe, downhole safety valve and oil pipe
The operation flow is as follows:
(1) the running completion string comprises a temporary plugging ball seat and a first completion packer;
(2) intermittently hanging and filling the completion fluid from the annulus during the running period, and judging the height of the liquid level according to the filling amount;
(3) a downhole safety valve;
(4) replacing the wellhead;
(5) clear water and annular protection liquid are added into the annular space; note: for a fracture-vug type large-leakage stratum, the step cannot be implemented, and only can the subsequent setting be completed under the condition of slurry, and the liquid cannot be replaced.
(6) Throwing balls, and pressurizing the inside of the oil pipe to seat and seal step by step; note: for a crack-cave type large-leakage stratum, the position of the liquid level of the annulus cannot be accurately mastered, the pressure difference is not easy to control, and a temporary plugging ball seat can be driven in advance.
(7) And (5) knocking off the temporary plugging ball seat to communicate the stratum.
Combine meticulous accuse pressure technique oil test completion integration tubular column structure: temporary plugging pipe string and well completion pipe string
The operation flow is as follows:
(1) the fine pressure control device is not removed after the drilling is finished;
(2) a temporary plugging tubular column is arranged by adopting a drill rod, a first well completion packer and a temporary plugging ball seat tubular column structure;
(3) after the temporary plugging of the oil sleeve is completed, grasping the liquid level of the annular space by using a monitoring system of a fine pressure control device, calculating the pressure difference, and pressurizing the inside of the oil pipe step by step to realize the setting, thereby finally realizing the temporary plugging of the oil sleeve;
(4) forward rotating and backward opening the upper part of the first well completion packer for anchoring and sealing, and taking out the drill rod;
(5) setting a secondary well completion pipe column according to a conventional well completion pipe column structure, adding a back-plugging joint at the lower part of the pipe column, and hermetically sealing the oil pipe one by one during setting;
(6) trial back-inserting, length matching, putting an underground safety valve, replacing clear water and annular protection liquid, and back-inserting in place;
(7) and (4) pressing the seat seal step by step in the oil pipe, checking the seal and punching the temporary plugging ball seat.
Compared with the prior conventional oil testing well completion operation method, the well completion operation method combined with the fine pressure control technology has the following advantages:
1) when the first quick temporary plugging tubular column is put in, the fine pressure control device is fully utilized, the liquid level height of the well can be automatically monitored at any time, the automatic grouting is realized, the control is more accurate compared with the conventional one-time well completion tubular column manual hoisting and grouting method, and the control is more favorable once the leakage condition of the shaft occurs; therefore, the drill rod is put in according to the mode of three upright posts and one upright post, the operation efficiency is improved, and the drilling time is shortened from 3 days to 1 day.
2) The first time of quick temporary plugging of the pipe column does not need replacing liquid for setting, the leakage problem in completion operation of karst cave fractured stratum is avoided, and the packer setting is directly realized in slurry.
3) The lower part of the first quick temporary plugging tubular column is provided with a blind plate seat sealing ball seat which is fixed by adopting a pin, and the shearing pressure P of the pinzFirst ensuring the first completion packer and secondAnd the two completion packers are completely set, the actual stratum leakage condition is considered to be larger than the larger setting pressure of the setting pressures of the two completion packers by at least 15MPa, and meanwhile, in order to avoid the prior release of the drill string, a standby setting nipple can be considered to be added into the drill string.
4) The second completion string is provided with a back-out sub to mate with the packer left at the bottom of the well after the first trip.
5) Compared with the conventional completion string, the structure of the second completion back-plugging string is unchanged except for the back-plugging joint added at the lower part, but when the back-plugging completion string is put in the second time, because the first string is put in by combining the fine pressure control device to establish a shaft barrier, the whole shaft is plugged, and the leisurely running-in operation time is provided for the second back-plugging completion string; the gas seal detection and other procedures can be carried out as required without worrying about the risk of well control to rush to lower the pipe column, so that the well control risk during the process of lowering the pipe column is greatly reduced.
6) For the well completion of the karst cave fractured leakage stratum, the conventional well completion operation mode can not replace the fluid completely, the working procedure of replacing the annular protection fluid is adopted, the differential pressure is not easy to control during setting, the method of the invention completely cuts off the leakage stratum when the well completion pipe string is inserted back for the second time, and good conditions are created for the well completion operation.
7) The blind plate ball seat at the lower part of the first quick temporary plugging pipe column can be adjusted through the pin, temporary plugging of a lost stratum oil pipe channel can be achieved, seat sealing of a secondary back plugging pipe column can be achieved through the ball seat, and a release can be knocked to the bottom of a well after the operation is completed, so that the stratum channel is completely communicated.
Exemplary embodiments of the present invention and the effects thereof are further illustrated and described below with reference to specific examples.
Example one: first well
The first well is a development well with a submarine structure seismic system top boundary in a certain area, the well is drilled to a depth of 6118.00m (vertical depth of 5050.71m), and the well completion method is liner pipe well completion. The accumulated leakage density during the fine pressure-controlled drilling period is 1.20-1.24 g/cm3Well killing fluid 2175.8m3. Adopt the next 7 "completion packer of fine control device temporarilyAnd closing the reservoir section, replacing clear water, then lowering the completion packer and the downhole safety valve back-plugging pipe column, replacing the annular protection liquid, performing acidizing modification on the test oil well section, draining liquid and testing.
Example two: no. two well
The second well is a development well with a certain area hidden structure and a south high point of a top well zone I, the drilling completion depth is 5822.00m (vertical depth is 5055.24m), and the well completion method is liner pipe well completion. The accumulated leakage density during the fine pressure-controlled drilling period is 1.07-2.20 g/cm3Well killing fluid 4761.80m3. The fine pressure control device is adopted for matching, drilling rod transmission perforation is firstly carried out on a 4-1/2 ' casing, a 7 ' completion packer is firstly temporarily closed before a completion string is put down, then a 7 ' completion packer is put in for production, and initial measurement is firstly carried out and then acid fracturing is carried out.
The two wells both adopt the well completion operation pipe column, the operation is successful at one time, and high-yield natural gas flow is obtained after the test.
In summary, the beneficial effects of the invention include at least one of the following:
(1) the conventional well completion operation pipe column is subjected to the implementation conditions in the well completion of the stratum with cracks, karst caves and easy leakage or large leakage
In order to various limitations, especially, the monitoring and control of the annular liquid level basically depend on manual work, once a shaft is complex, the treatment is extremely inconvenient, the well control risk is high in the whole drilling process, the well completion operation method combined with the fine pressure control technology greatly reduces the risk by utilizing the original fine pressure control device, and the annular liquid level is sent into a first temporary plugging tubular column through a drill rod, so that the drilling time is shortened, the control force of the annular liquid level during the drilling is improved, and the well control safety is guaranteed;
(2) setting releasing tool for first string in well completion operation method combined with fine pressure control technology
The operation is simple and quick, the temporary plugging barrier of the shaft is established in a short time, good conditions are created for secondary back plugging, the secondary back plugging completion pipe string is put in when the shaft is in a completely stable and controllable state, and conditions are provided for air sealing and replacing annular space protection liquid when the completion pipe string is put in;
(3) the difficulty of completion of the stratum with the crack karst cave easy to leak is overcome by utilizing the fine pressure control device, the blind injection amount is reduced, the control of the shaft condition in the whole well completion process is established on the basis of scientific monitoring, and the problems of early releasing, inaccurate replacement fluid leakage metering and the like are avoided.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (8)
1. A well completion operation method combined with a fine pressure control technology aims at the porosity of more than 4%, the permeability of 0.12-0.4K/mD and the leakage rate of more than 3m during drilling3The testing and well completion operation of the fracture-cave carbonate reservoir is characterized in that the well completion operation method is realized by a testing and well completion integrated tubular column combined with a fine pressure control technology, the integrated tubular column comprises a temporary plugging tubular column and a well completion tubular column, wherein,
the temporary plugging string comprises a fine pressure control device, a drill rod, a first completion packer and a temporary plugging ball seat, wherein,
the fine pressure control device is connected with the upper end of the drill rod through a wellhead device, and can automatically monitor the liquid level height and pressure in the shaft annulus, adjust the grouting amount in real time and maintain the pressure balance in the well;
the upper end part of the first completion packer is connected with the lower end part of the drill rod, and the upper end part of the first completion packer can be separated from the lower end part of the drill rod by releasing;
the upper end of the temporary plugging ball seat is connected with the lower end of the first completion packer through an oil pipe, and the lower end of the temporary plugging ball seat is communicated with the underground space;
under the condition that the first completion packer is sealed by pressurization, the temporary plugging string can temporarily plug the formation space and pull out a drill pipe at the upper part of the first completion packer;
the completion string includes tubing, a downhole safety valve, a second completion packer, and a stab sub, wherein,
the upper end of the oil pipe is connected with a wellhead device, the downhole safety valve is arranged on the oil pipe, the second completion packer is connected with the lower end of the oil pipe, the back-plugging joint is connected with the lower end of the second completion packer through a pipeline, and the back-plugging joint can be matched with the upper end of the first completion packer to realize back plugging;
under the condition that the second completion packer is sealed by pressurization, after the seal is tested to be qualified, continuously pressurizing and driving the temporary plugging ball seat to communicate the stratum;
and the well completion operation method comprises the following steps:
a temporary plugging tubular column is put in, and a fine pressure control device is utilized to monitor the liquid level of the annulus and automatically compensate the liquid level;
after the penetration depth of the temporary plugging pipe column exceeds the height of the liquid level of the annulus, slurry is poured into the oil pipe from the lower side of the temporary plugging pipe column; after the temporary plugging tubular column is put in place, monitoring the liquid level of the annulus by using a fine pressure control device, calculating the pressure difference, and pressurizing the interior of an oil pipe step by step to seal a first completion packer so as to realize temporary plugging of the oil sleeve and pull out of a drill rod;
putting a well completion pipe string, and replacing clear water and annular protection liquid;
and after the back plugging is in place, pressurizing step by step from the oil pipe to seal the second completion packer, and pressurizing to remove the temporary plugging ball seat to communicate the stratum after the seal is tested to be qualified.
2. A method of completion operations incorporating fine pressure control techniques according to claim 1, wherein the upper end of the first completion packer is provided with an anchoring seal and the drill pipe is rotated forward and backward to release the anchoring seal from the first completion packer.
3. A method of completion operations incorporating fine control pressure technology according to claim 1 or 2, wherein the completion string is a conventional completion string provided with a back-stab sub at its lower end.
4. A method of completion operations incorporating fine pressure control techniques according to claim 1, wherein the running completion string comprises the steps of:
and (3) sealing the oil pipe one by one during the running process, trying to insert again, lengthening the length, and running into the underground safety valve until the insert is in place.
5. The method of claim 1 in combination with a fine pressure control technique wherein the temporary plugging ball seat is fixed with a pin having a shear pressure at least 15Mpa greater than the greater of the set pressures of the first and second completion packers to avoid premature release.
6. The method of claim 1, wherein the integrated string further comprises a backup setting sub, the backup setting sub is arranged between the back-plugging joint and the second completion packer and can perform plugging when the temporary plugging ball seat is released in advance, and the setting success rate of the second completion packer is improved.
7. A method of completion operations incorporating fine pressure control techniques in accordance with claim 1, wherein said fine pressure control device comprises an automatic throttling control system and a back pressure compensation system, wherein,
the automatic throttling control system is used for shaft emergency safety control during the running of a well completion pipe string, and the back pressure compensation system can automatically perform grouting according to the leakage liquid level to maintain the balance in the well.
8. A method of completion operations incorporating fine control of pressure technology in accordance with claim 1 wherein said diverting ball seat is a blind ball seat.
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