CN113482561A - Oil and gas well sealing casing recovery device and recovery method thereof - Google Patents
Oil and gas well sealing casing recovery device and recovery method thereof Download PDFInfo
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- CN113482561A CN113482561A CN202110579451.5A CN202110579451A CN113482561A CN 113482561 A CN113482561 A CN 113482561A CN 202110579451 A CN202110579451 A CN 202110579451A CN 113482561 A CN113482561 A CN 113482561A
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- 238000011084 recovery Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000007789 sealing Methods 0.000 title claims abstract description 22
- 238000005553 drilling Methods 0.000 claims abstract description 52
- 238000005520 cutting process Methods 0.000 claims abstract description 26
- 239000004568 cement Substances 0.000 claims description 26
- 239000002002 slurry Substances 0.000 claims description 13
- 230000006837 decompression Effects 0.000 claims description 9
- 238000010008 shearing Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 238000003801 milling Methods 0.000 abstract description 13
- 238000002360 preparation method Methods 0.000 abstract description 7
- 238000000227 grinding Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000003701 mechanical milling Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or 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
- 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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Abstract
The invention provides an oil and gas well sealing sleeve recovery device and a recovery method thereof, wherein the recovery device comprises a drilling machine, a drill rod, a sleeve hydraulic cutter and a sleeve recovery tool, the drilling machine is connected with the head end of the drill rod, the tail end of the drill rod is firstly connected with the sleeve hydraulic cutter according to the cutting and recovery operation sequence, after a sleeve to be recovered is cut by a hydraulic cutter blade on the sleeve hydraulic cutter, the drill rod is lifted upwards, and then the sleeve recovery tool is connected with the tail end of the drill rod and is lowered into the top of the sleeve to be recovered. The method can avoid the shaft milling operation of the grinding sleeve in the shaft preparation operation process before sidetracking, effectively improve the operation efficiency and reduce the operation cost.
Description
Technical Field
The invention relates to the technical field of petroleum engineering, in particular to an oil-gas well sealing casing recovery device and a recovery method thereof.
Background
After resources in an oil reservoir developed by an oil and gas well are exhausted, in order to fully utilize a well slot and supporting facilities of the oil and gas well, the original well slot is often required to be utilized for sidetrack drilling operation, and a well is dug again or abandoned by the oil and gas well, so that a navigation channel is recovered, and the safety of marine navigation is guaranteed.
Sidetracking refers to the re-drilling of a well by breaking or retrieving a portion of the length of casing in the original wellbore. The technology can fully develop different oil reservoirs in the oil field, improve the utilization rate of the well slot, and remove the well, namely remove and recover the oil-gas well and related facilities. The oil-gas well comprises a plurality of layers of casings, the casings are sealed by cement, the recovery difficulty is high, casings in a shaft of the oil-gas well are sealed by cement and cannot be recovered by simple lifting, the existing casings can be recovered or damaged before sidetrack drilling or well abandoning, namely the shaft preparation technology is the shaft preparation technology, because pile pulling resistance of the casings is overlarge, a conventional workover rig or a small-sized drilling rig cannot provide enough pile pulling force, the current shaft preparation technology mainly comprises two methods of milling and windowing and milling and a recovery pipe column by a milling sleeve, the two methods in the prior art both depend on tools made of hard alloy to carry out mechanical milling, so that the casings in the shaft are damaged or recovered, drilling operation is carried out after the stratum is exposed, the mechanical milling method needs to depend on the drilling rig to drive the drilling tool to carry out long-time milling, the cost of the drilling rig and manpower is increased, the milling can consume additional milling tools, and the tools need to frequently drill and replace milling shoes and the like, further increasing the cost and the operation time, and the window opening effect control of milling window opening is difficult.
Disclosure of Invention
The invention overcomes the defects in the prior art that the recovery of the sealed casing in the shaft is difficult, the time consumption of milling and windowing is long, the milling tool is replaced by frequently tripping the drill, the cost is high, the precision control is low and the like, and provides the recovery device and the recovery method for the sealed casing of the oil and gas well.
The purpose of the invention is realized by the following technical scheme.
A recovery device for a sealing sleeve of an oil and gas well comprises a drilling machine, a drill rod, a sleeve hydraulic cutter and a sleeve recovery tool, wherein the drilling machine is connected with the head end of the drill rod, the tail end of the drill rod is firstly connected with the sleeve hydraulic cutter according to the cutting and recovery operation sequence, the drill rod is lifted up after a sleeve to be recovered is cut by a hydraulic cutter blade on the sleeve hydraulic cutter, and then the sleeve recovery tool is connected with the tail end of the drill rod and then is lowered into the top of the sleeve to be recovered;
the casing pipe recovery tool includes power tool, decompression valve in the pit and can move back formula sleeve pipe and drag for the lance, power tool's head end in the pit with the tail end of drilling rod links to each other be provided with power tool slips in the pit on power tool's the middle part outer wall for the sheathed tube inner wall of interlock technique, power tool's tail end in the pit with the head end of decompression valve in the pit links to each other, the tail end of decompression valve in the pit with the head end that can move back formula sleeve pipe dragged for the lance links to each other, but be provided with on the outer wall of moving back formula sleeve pipe dragged for with treat that the sheathed tube inner wall of retrieving bites in order to realize carrying the purpose of treating recovery sleeve pipe mutually.
Tool joints are arranged between the underground power tool and the underground pressure release valve and between the underground pressure release valve and the retractable casing fishing spear.
A method for recovering a sealing casing of an oil and gas well comprises the following steps:
step 2, assembling a casing recovery tool, sequentially connecting the underground power tool, the underground pressure release valve and the retractable casing fishing spear from top to bottom, connecting the casing recovery tool with the tail end of a drill rod, starting the drill after the head end of the drill rod is connected with the drill, lowering the casing recovery tool to the top of the casing to be recovered by using the drill rod, according to the length of each tool of the underground power tool, the underground pressure release valve and the retractable casing spear, the part below the underground power tool is sent into the casing to be recovered, and by slowly lifting the casing to be recovered, the internal mechanism of the retractable casing spear props up the retractable casing spear slips to ensure that the retractable casing spear slips are meshed with the inner wall of the casing to be recovered, after the retractable spear is started, the underground pressure release valve is closed in a mode of rotating by using a drilling machine or lifting the casing to be recovered so as to seal a fluid passage in the casing to be recovered;
step 3, starting the underground power tool, connecting a ground well cementation pump or a slurry pump with a drill rod through a pipeline, starting the ground well cementation pump or the slurry pump, slowly pressurizing, shearing an internal shearing safety ring of the underground power tool, keeping the underground power tool in an activated state, continuously and slowly increasing pressure, opening an underground power tool slip by an internal mechanism of the underground power tool, engaging the underground power tool slip with the inner wall of the technical casing, continuously pressurizing, starting the underground power tool to generate pile pulling force, lifting the casing to be recovered and damaging a shaft annulus cement ring between the technical casing and the casing to be recovered;
and 5, stopping the ground cementing pump or the slurry pump, unloading the pressure, reducing the load of the drilling machine or rotating in the opposite direction in the step 2 to open the underground pressure release valve, and recovering the casing recovery tool and the casing to be recovered by using the drilling machine.
In the step 1, according to the well logging and cementing quality data, the quality and the filling condition of a shaft annulus cement sheath between a technical casing and a casing to be recovered are judged, the weak point of the shaft annulus cement sheath between the technical casing and the casing to be recovered is determined, and the cutting position and the length of each section of the cut casing are determined according to the length of the casing to be recovered which is recovered according to the drilling design requirement and the weak point of the shaft annulus cement sheath between the technical casing and the casing to be recovered.
In step 2, when the casing recovery tool is assembled, recording the lengths of each tool of the downhole power tool, the downhole pressure release valve and the retractable casing fishing spear; according to the length of recording each tool of the underground power tool, the underground pressure release valve and the retractable casing fishing spear, the length l from the tail end of the retractable casing fishing spear to the tail end of the underground power tool is calculated, the length l is the length of continuing descending of the casing recovery tool, and the starting mode of the underground pressure release valve comprises a lifting type, a rotating type or a throwing type.
In step 3, when the pressure exceeds 10MPa, the internal shearing safety ring of the downhole power tool is sheared, the downhole power tool is in an activated state, and the pressure is reduced to 5MPa, wherein the pressure is continuously and slowly increased by using a surface well cementation pump or a mud pump.
In step 3, after the slips of the downhole power tool are meshed with the inner wall of the technical casing, the ground cementing pump or the slurry pump is continuously pressed, the pressure starts to keep stable after a first peak value appears, the pressure does not continuously rise, the phenomenon that a shaft annulus cement ring between the technical casing and the casing to be recovered is damaged is shown, the casing to be recovered starts to be recovered, and the pressure starts to fall after a second peak value appears, the phenomenon that the downhole power tool completes one lifting stroke is shown.
In step 4, after the pressure of the ground well cementation pump or the slurry pump has a second peak value, the pressure of the pump is reduced to 0, the casing to be recovered is lifted, the lifting length is the one-stroke length of the underground power tool, if the casing to be recovered cannot be lifted, the step 3 is repeated, and when the pressure is stabilized after the pressure has the first peak value, the pile pulling force converted by the pressure is smaller than the lifting force which can be provided by the drilling machine, the operation of the step 3 is repeated.
In step 4, the ground cementing pump or the slurry pump continuously works, the pressure continuously rises, and a pressure stabilizing stage does not occur until the maximum working pressure of the underground power tool is reached, which indicates that the well bore annular cement sheath between the technical casing and the casing to be recovered is not damaged, and the casing to be recovered cannot be recovered.
The invention has the beneficial effects that: based on a casing recovery tool, by utilizing the method, the use of milling windowing or casing milling operation is avoided when the preparation operation of the oil gas well side drilling casing is carried out, the operation time is effectively reduced, the operation cost is reduced, and compared with the prior casing preparation technology, the method can save the operation time of at least two days;
the shaft is used for bearing the reverse acting force generated by pile pulling, so that the maximum pile pulling force provided by the invention can break through the limitation of the maximum bearing capacity of an offshore platform or a drilling platform, and simultaneously, the jolt unfreezing operation is not needed, so that the annular cement sheath of the casing is effectively damaged, the efficient recovery of the casing is realized, meanwhile, the damage to the offshore platform caused by excessive load is avoided, and the safety of platform workers and facilities is sufficiently ensured;
the drilling machine is only used for assisting to implement operation, pile pulling force is not needed to be provided, the operation can be implemented by using the small workover rig, and compared with the prior art, the preparation operation of the front shaft of the sidetrack drilling can be completed before the large drilling machine is in place, so that the operation time of the large drilling machine is further reduced, and the drilling cost is reduced.
Drawings
FIG. 1 is a schematic representation of an embodiment of a portion of the present invention within a wellbore and the relative position of the tools;
FIG. 2 is a schematic diagram of the casing cutting operation implemented by the casing hydraulic cutter of the present invention;
FIG. 3 is a schematic view of the overall structure of the present invention;
in the figure: 1 is a downhole power tool; 1-1 is a slip of a downhole power tool; 2 is a downhole pressure relief valve; 3 is a retractable sleeve fishing spear; 3-1 is a retractable sleeve spear slip; 4 is a surface casing; 5 is a technical sleeve; 6, casing to be recovered (namely cement sheath sealing casing); 7 is a shaft annulus cement sheath between the surface casing and the technical casing; 8 is a shaft annulus cement sheath between the technical casing and the casing to be recovered; 9 is a drill rod; 10 is a tool joint; 11 is a casing hydraulic cutter; 11-1 is a hydraulic cutting knife blade; 12 is the cutting position; 13 is the top of the casing to be recovered; 14 is a drilling machine.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
Example one
A recovery device for a sealing casing of an oil and gas well comprises a drilling machine 14, a drill rod 9, a casing hydraulic cutter 11 and a casing recovery tool, wherein the drilling machine 14 is connected with the head end of the drill rod 9, the tail end of the drill rod 9 is firstly connected with the casing hydraulic cutter 11 according to the cutting and recovery operation sequence, after a casing 6 to be recovered is cut by a hydraulic cutter blade 11-1 on the casing hydraulic cutter 11, the drill rod 9 is lifted upwards, and after the casing recovery tool is connected with the tail end of the drill rod 9, the casing recovery tool is lowered into the top of the casing 6 to be recovered;
the casing pipe recovery tool includes power tool 1 in the pit, decompression valve 2 in the pit and retractable sleeve pipe drag for lance 3, the head end of power tool 1 in the pit links to each other with the tail end of drilling rod 9, be provided with power tool slips 1-1 in the pit on power tool 1's the middle part outer wall, an inner wall for interlock technical casing 5, the tail end of power tool 1 in the pit links to each other with the head end of decompression valve 2 in the pit, the tail end of decompression valve 2 in the pit links to each other with retractable sleeve pipe drag for lance 3's head end, be provided with retractable sleeve pipe drag for lance slips 3-1 on retractable sleeve pipe drag for with treat that the inner wall of recovery sleeve pipe 6 is interlock in order to realize carrying the purpose of treating recovery sleeve pipe 6.
The implementation method is as shown in fig. 3, a drill rig 14 is connected to a drill rod 9, a casing recovery tool is connected to the drill rod 9, a pipe column is fed into or lifted out of a shaft through controlling the drill rig 14, the casing recovery tool is fed to the top 13 position of a casing to be recovered by using the drill rig 14 and the drill rod 9, then the casing recovery tool is used for recovering the casing 6 to be recovered, and the casing recovery tool is used for executing a tool for recovering a casing for sealing of an oil and gas well.
The string refers to a working string which is formed by connecting a drill pipe 9, a casing recovery tool and the like to form a set of continuous working string and is used for performing operation in a shaft of an oil-gas well.
The shaft is a multilayer tubular column structure which is composed of a surface casing 4, a technical casing 5, a casing 6 to be recovered, a shaft annular cement sheath 7 between the surface casing and the technical casing and a shaft annular cement sheath 8 between the technical casing and the casing to be recovered and is used for exploiting oil and gas resources in the stratum.
Example two
A method for recovering a sealing casing of an oil and gas well comprises the following steps:
step A, connecting a casing hydraulic cutter 11 with the tail end of a drill rod 9, starting the drill 14 after the head end of the drill rod 9 is connected with the drill 14, lowering the casing hydraulic cutter 11 to a cutting position by using the drill rod 9, cutting and segmenting the casing 6 to be recovered by using a hydraulic cutter blade 11-1, recovering the casing hydraulic cutter 11 by using the drill rod 9 after the cutting operation is finished, and taking down the casing hydraulic cutter 11 at the tail end of the drill rod 9;
firstly, the logging information of the old well to be processed is acquired, mainly the well cementation quality information, such as CBL. And judging the weak point of the shaft annular cement sheath 8 between the technical casing of the casing 6 to be recovered of the well and the casing to be recovered according to the logging information. And finally determining the cutting position of the casing 6 to be recovered according to the requirement on the length of the recovery casing in the drilling design of the well, and calculating the length of each section of the casing after cutting. The step is to ensure that the pile pulling resistance of each section of the casing to be recovered after recovery and cutting is smaller than the pile pulling force provided by the underground power tool 1, so as to smoothly recover the casing. If the length of the cut section of the casing is too long, the pile pulling resistance is larger than the pile pulling force provided by the underground power tool due to cement sealing, and the casing cannot be successfully recovered.
After the casing cutting position is determined, the casing hydraulic cutter 11 is assembled at the drilling rig 14 drilling floor and the length is recorded, the upper part is connected with the drilling rig 14 through the drill rod 9. After the function test is completed on the ground, the shaft is driven by the drilling machine to be lowered to each position to be cut and the casing 6 to be recovered is cut, and as shown in fig. 2, the casing is cut into a plurality of sections by a complete casing. After cutting, the casing hydraulic cutter 11 is lifted out of the shaft under the driving of the drilling machine 14.
Step B, assembling a casing recovery tool, and sequentially connecting the underground power tool 1, the underground pressure release valve 2 and the retractable casing fishing spear 3 from top to bottom;
first, the up-down order, length, and functional requirements of the casing recovery tool are determined. According to actual operation needs, if the sealing quality of the technical casing of the casing 6 to be recovered and the shaft annulus cement ring 8 between the casings to be recovered is good, and the casing recovery pile pulling resistance is large, tools such as an underground motor, a casing hydraulic cutter, a conical mill shoe and the like are additionally connected to the lower portion of a casing recovery tool, so that the casing is additionally cut once when the pile pulling resistance is too large, and the pile pulling resistance is reduced. And according to the relative positions and lengths of tools such as a casing cutting knife, a casing cut position and a retractable casing fishing spear, a drill collar is added among the tools for matching the length. The subassembly order of casing pipe recovery instrument is from supreme down being in proper order for can moving back formula casing drag for lance 3, pressure release valve 2 in the pit, power tool 1 in the pit, drilling rod 9. An additionally connected downhole motor and a casing hydraulic cutter are arranged at the lower part of the retractable casing fishing spear 3.
And C: connecting a casing recovery tool with the tail end of a drill rod 9, starting the drill 14 after the head end of the drill rod 9 is connected with the drill 14, descending the casing recovery tool to the top 13 of a casing to be recovered by using the drill rod 9, and sending a part below the underground power tool 1 into the casing 6 to be recovered according to the length of each tool of the underground power tool 1, the underground pressure release valve 2 and the retractable casing fishing spear 3;
the length of all tools is measured after the tools installed and the sequence is determined, and then the rig is connected and lowered into the wellbore until it is lowered to the top 13 of the casing 6 to be recovered. As shown in fig. 1, after the bottom of the string reaches the top 13 position, the length l from the bottom of the string to the bottom of the downhole power tool 1 is calculated from the length of each tool run into the well. And controlling the drilling machine to slowly lower the drill rod by the length l, and sending the tools below the underground power tool 1 into the casing 6 to be recovered.
Step E: by slowly lifting the casing 6 to be recovered, an internal mechanism of the retractable casing spear 3 struts a retractable casing spear slip 3-1, so that the retractable casing spear slip 3-1 is meshed with the inner wall of the casing 6 to be recovered, and the spear is anchored on the inner wall of the casing 6 to be recovered;
step F: the underground pressure release valve 2 is closed by rotating the drilling machine 14 or lifting the casing 6 to be recovered and the like so as to seal the fluid passage in the casing 6 to be recovered;
the underground pressure release valve 2 is closed by using modes of ball throwing, rotation of a drilling machine or lifting of a pipe column and the like, and a fluid passage in the pipe column is closed. The downhole pressure relief valve 2 is a valve tool capable of closing a fluid passage in a pipe column. By closing the underground pressure release valve 2, the underground power tool 1 can realize pressure stabilization, generate pile pulling force and realize the recovery of the sealing sleeve. And opening the underground pressure release valve 2 to communicate the fluid channel in the pipe column with the well annulus, thereby realizing the functions of well flushing, starting an underground motor and a casing hydraulic cutter connected at the lower part and the like. The starting mode of the underground pressure relief valve 2 is related to the design method thereof, and is generally divided into three modes, namely a lifting type mode, a rotating type mode or a ball throwing type mode.
Step G: starting the underground power tool 1, connecting a ground cementing pump or a slurry pump with a drill rod through a pipeline, starting the ground cementing pump or the slurry pump, slowly pressurizing, shearing an internal shearing safety ring of the underground power tool 1, keeping the underground power tool 1 in an activated state, continuously and slowly increasing pressure, opening an underground power tool slip 1-1 by an internal mechanism of the underground power tool 1, and engaging the underground power tool slip 1-1 with the inner wall of a technical casing 5 to realize anchoring;
after the pressure borne by the downhole power tool 1 exceeds 10MPa, the internal shearing safety ring is sheared, the tool is in an activated state, meanwhile, the pressure is reduced to about 5MPa, the pressure is continuously and slowly increased, and the internal mechanism of the downhole power tool 1 props up a slip 1-1 of the downhole power tool and extends out to be meshed with the inner wall of the technical casing 5.
Step H: continuously pressurizing through a ground well cementation pump or a slurry pump, wherein the underground power tool 1 generates pile pulling force to destroy a shaft annulus cement sheath 8 between the technical casing 5 and the casing 6 to be recovered;
the ground pump package is continuously suppressed, and power tool 1 passes through multistage series connection pneumatic cylinder and turns into pressure and pulls out the stake power in the pit, drives lower part retractable sleeve pipe and drags for lance 3, begins to destroy and treats annular space cement ring 8 and withdraws and receive sleeve pipe 6. The reverse force generated by the pile pulling of the downhole power tool 1 is transmitted to the technical casing 5 and borne by the wellbore. The overall operation state is shown in fig. 1 and 3.
Step I, after the underground power tool 1 finishes one lifting stroke, lifting the casing 6 to be recovered, and repeating the steps G-H until the casing 6 to be recovered is lifted;
when the pressure is stable after the first peak value, the pressure does not rise any more, which indicates that the well bore annular cement sheath 8 starts to be damaged and the casing 6 to be recovered starts to be recovered. The pressure begins to drop after the second peak, indicating that the downhole power tool 1 has completed a lift stroke.
Stopping a ground well cementation pump or a slurry pump, unloading the pressure in the pipe column, releasing and withdrawing the slip 1-1 of the underground power tool after the reading of a pressure gauge is reduced to 0, lifting the pipe column by using a drilling machine 14, wherein the lifting length is one stroke length of the underground power tool 1, then restarting a ground pump set to press, repeating the procedures, finishing pile pulling operation when the pile pulling force converted by the pressure is kept stable after the pressure has a first peak value and is smaller than the lifting force which can be provided by the drilling machine, and switching to the drilling machine 14 to lift a sleeve recovery tool and a sleeve 6 to be recovered.
The calculation formula of the pressure and the pile pulling force is as follows:
F＝P·S
F＝P·S
in the formula: f is pile pulling force, N; p is the pressure at steady pressure, MPa; s is the piston area of all hydraulic cylinders contained in the downhole power tool 1, m2。
Step J: if the shaft annulus cement sheath 8 between the technical casing and the casing to be recovered in the step 3 cannot be damaged, namely the casing 6 to be recovered cannot be lifted up, recovering the casing recovery tool by using a drilling machine 14, replacing the casing recovery tool with a casing hydraulic cutter 11, repeating the step 1, performing secondary cutting on the casing 6 to be recovered to reduce the length of the casing section recovered once, then recovering the casing hydraulic cutter 11 by using the drilling machine 14, replacing the casing recovery tool with a casing recovery tool, repeating the step 3 until the casing 6 to be recovered is lifted up, and repeating the step G-I;
in the working process of the underground power tool 1, the pressure displayed by a ground cementing pump or a mud pump pressure gauge continuously rises, and a pressure stabilizing stage does not occur until the maximum working pressure of the underground power tool 1 is reached, which indicates that the strength of the annular cement sheath 8 exceeds the pile pulling force provided by the underground power tool and cannot be damaged, and the section of casing cannot be recovered.
Stopping a ground well cementing pump or a slurry pump, unloading the pressure of a pipe column to 0, releasing the underground power tool slips 1-1 from the inner wall of the technical casing 5, opening the underground pressure release valve 2, and releasing the retractable casing fishing spear 3 from the interior of the casing 6 to be recovered.
Step K: stopping a ground well cementation pump or a slurry pump, unloading the pressure, reducing the load of the drilling machine 14 or rotating in the opposite direction in the step 2 to open the underground pressure release valve 2, and recovering the casing recovery tool and the casing to be recovered 6 by using the drilling machine 14;
and after the shaft annulus cement sheath 8 between the technical casing and the casing to be recovered is damaged, after the casing to be recovered 6 is lifted, the ground well cementing pump or the slurry pump is closed, the pressure is unloaded to 0, the underground power tool slips 1-1 are released from the inner wall of the technical casing 5, and the underground pressure release valve 2 is opened.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (10)
1. The utility model provides an oil gas well sealing sleeve recovery unit which characterized in that: the device comprises a drilling machine, a drill rod, a casing hydraulic cutter and a casing recovery tool, wherein the drilling machine is connected with the head end of the drill rod, the tail end of the drill rod is firstly connected with the casing hydraulic cutter according to the cutting and recovery operation sequence, the drill rod is lifted up after a casing to be recovered is cut by a hydraulic cutter blade on the casing hydraulic cutter, and then the casing recovery tool is connected with the tail end of the drill rod and then is lowered into the top of the casing to be recovered;
the casing pipe recovery tool includes power tool, decompression valve in the pit and can move back formula sleeve pipe and drag for the lance, power tool's head end in the pit with the tail end of drilling rod links to each other be provided with power tool slips in the pit on power tool's the middle part outer wall for the sheathed tube inner wall of interlock technique, power tool's tail end in the pit with the head end of decompression valve in the pit links to each other, the tail end of decompression valve in the pit with the head end that can move back formula sleeve pipe dragged for the lance links to each other, but be provided with on the outer wall of moving back formula sleeve pipe dragged for with treat that the sheathed tube inner wall of retrieving bites in order to realize carrying the purpose of treating recovery sleeve pipe mutually.
2. An oil and gas well sealing casing recovery device according to claim 1, characterized in that: tool joints are arranged between the underground power tool and the underground pressure release valve and between the underground pressure release valve and the retractable casing fishing spear.
3. A method for recovering a sealing casing of an oil and gas well is characterized by comprising the following steps: the method comprises the following steps:
step 1, connecting a casing hydraulic cutter with the tail end of a drill rod, starting the drill after the head end of the drill rod is connected with the drill, lowering the casing hydraulic cutter to a cutting position by using the drill rod, cutting and segmenting a casing to be recovered by using a hydraulic cutter blade, recovering the casing hydraulic cutter by using the drill rod after the cutting operation is finished, and taking down the casing hydraulic cutter at the tail end of the drill rod;
step 2, assembling a casing recovery tool, sequentially connecting the underground power tool, the underground pressure release valve and the retractable casing fishing spear from top to bottom, connecting the casing recovery tool with the tail end of a drill rod, starting the drill after the head end of the drill rod is connected with the drill, lowering the casing recovery tool to the top of the casing to be recovered by using the drill rod, according to the length of each tool of the underground power tool, the underground pressure release valve and the retractable casing spear, the part below the underground power tool is sent into the casing to be recovered, and by slowly lifting the casing to be recovered, the internal mechanism of the retractable casing spear props up the retractable casing spear slips to ensure that the retractable casing spear slips are meshed with the inner wall of the casing to be recovered, after the retractable spear is started, the underground pressure release valve is closed in a mode of rotating by using a drilling machine or lifting the casing to be recovered so as to seal a fluid passage in the casing to be recovered;
step 3, starting the underground power tool, connecting a ground well cementation pump or a slurry pump with a drill rod through a pipeline, starting the ground well cementation pump or the slurry pump, slowly pressurizing, shearing an internal shearing safety ring of the underground power tool, keeping the underground power tool in an activated state, continuously and slowly increasing pressure, opening an underground power tool slip by an internal mechanism of the underground power tool, engaging the underground power tool slip with the inner wall of the technical casing, continuously pressurizing, starting the underground power tool to generate pile pulling force, lifting the casing to be recovered and damaging a shaft annulus cement ring between the technical casing and the casing to be recovered;
step 4, after the underground power tool completes one lifting stroke, lifting the drill rod to reset the underground power tool, repeating the step 3, if the annulus cement ring of the shaft between the technical casing and the casing to be recovered cannot be damaged in the step 3, namely the casing to be recovered cannot be lifted, recovering the casing recovery tool by using a drilling machine, replacing the casing recovery tool with a casing hydraulic cutter, repeating the step 1, performing secondary cutting on the casing to be recovered to reduce the length of the casing section recovered once, then recovering the casing hydraulic cutter by using the drilling machine, replacing the casing recovery tool with the casing recovery tool, and repeating the step 3 until the casing to be recovered is lifted;
and 5, stopping the ground cementing pump or the slurry pump, unloading the pressure, reducing the load of the drilling machine or rotating in the opposite direction in the step 2 to open the underground pressure release valve, and recovering the casing recovery tool and the casing to be recovered by using the drilling machine.
4. An oil and gas well sealing casing recovery method as claimed in claim 1, wherein: in the step 1, according to the well logging and cementing quality data, the quality and the filling condition of a shaft annulus cement sheath between a technical casing and a casing to be recovered are judged, the weak point of the shaft annulus cement sheath between the technical casing and the casing to be recovered is determined, and the cutting position and the length of each section of the cut casing are determined according to the length of the casing to be recovered which is recovered according to the drilling design requirement and the weak point of the shaft annulus cement sheath between the technical casing and the casing to be recovered.
5. An oil and gas well sealing casing recovery method as claimed in claim 1, wherein: in step 2, when the casing recovery tool is assembled, recording the lengths of each tool of the downhole power tool, the downhole pressure release valve and the retractable casing fishing spear; according to the length of recording each tool of the underground power tool, the underground pressure release valve and the retractable casing fishing spear, the length l from the tail end of the retractable casing fishing spear to the tail end of the underground power tool is calculated, the length l is the length of continuing descending of the casing recovery tool, and the starting mode of the underground pressure release valve comprises a lifting type, a rotating type or a throwing type.
6. An oil and gas well sealing casing recovery method as claimed in claim 1, wherein: in step 3, when the pressure exceeds 10MPa, the internal shearing safety ring of the downhole power tool is sheared, the downhole power tool is in an activated state, and the pressure is reduced to 5MPa, wherein the pressure is continuously and slowly increased by using a surface well cementation pump or a mud pump.
7. An oil and gas well sealing casing recovery method as claimed in claim 1, wherein: in step 3, after the slips of the downhole power tool are meshed with the inner wall of the technical casing, the ground cementing pump or the slurry pump is continuously pressed, the pressure starts to keep stable after a first peak value appears, the pressure does not continuously rise, the phenomenon that a shaft annulus cement ring between the technical casing and the casing to be recovered is damaged is shown, the casing to be recovered starts to be recovered, and the pressure starts to fall after a second peak value appears, the phenomenon that the downhole power tool completes one lifting stroke is shown.
8. An oil and gas well sealing casing recovery method as claimed in claim 1, wherein: in step 4, after the pressure of the ground well cementation pump or the slurry pump has a second peak value, the pressure of the pump is reduced to 0, the casing to be recovered is lifted, the lifting length is the one-stroke length of the underground power tool, if the casing to be recovered cannot be lifted, the step 3 is repeated, and when the pressure is stabilized after the pressure has the first peak value, the pile pulling force converted by the pressure is smaller than the lifting force which can be provided by the drilling machine, the operation of the step 3 is repeated.
9. An oil and gas well sealing casing recovery method as claimed in claim 1, wherein: in step 4, the ground cementing pump or the slurry pump continuously works, the pressure continuously rises, and a pressure stabilizing stage does not occur until the maximum working pressure of the underground power tool is reached, which indicates that the well bore annular cement sheath between the technical casing and the casing to be recovered is not damaged, and the casing to be recovered cannot be recovered.
10. Use of an oil and gas well casing recovery device according to claim 1 or 2 in shallow sidetracking operations, wherein: this recovery unit can practice thrift two days' operating time.
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