CN102268972A - Method for preventing setting failure of packer resulted from creeping of pipe string - Google Patents
Method for preventing setting failure of packer resulted from creeping of pipe string Download PDFInfo
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- CN102268972A CN102268972A CN2011102226032A CN201110222603A CN102268972A CN 102268972 A CN102268972 A CN 102268972A CN 2011102226032 A CN2011102226032 A CN 2011102226032A CN 201110222603 A CN201110222603 A CN 201110222603A CN 102268972 A CN102268972 A CN 102268972A
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Abstract
The invention relates to a method for preventing the setting failure of a packer, in particular to a method for preventing the setting failure of the packer resulted from the creeping of a pipe string. According to the method disclosed by the invention, in a dispensing, acidizing and crushing pipe string composed of an expandable packer, to prevent the setting failure of the expandable packer resulted from the creeping of the pipe string, an oil pipe is vertically layered into two pressure systems through an isolation setting device, therefore, a hydraulic slip packer at the upper part of the isolation setting device is set prior to the expandable packer at the lower part; furthermore, after a salvageable plug on the isolation setting device is salvaged, an ample channel is provided for setting and dropping/fishing tests of a lower tool, so that the conventional dispensing, acidizing and crushing construction cannot be influenced by the isolation setting device. Because the lower pipe string can be anchored and suspended by the set hydraulic slip packer at the upper part of the isolation setting device, the setting failure of the expandable packer resulted from the creeping of the pipe string can be effectively prevented. The method is also applicable to other dispensing, acidizing and crushing pipe strings composed of hydraulic compressible packers.
Description
Technical field
The present invention relates to a kind of method that prevents that packer setting lost efficacy, be specifically related to a kind of method that prevents that the tubing string wriggling from causing packer setting to lose efficacy.
Background technology
Inflatable packer have set easily, the characteristics of good sealing effect, therefore be used for looking in water blockoff, water filling, acidifying, the fracturing string more, particularly at casing corrosion, distortion and barefoot interval, the advantage of inflatable packer is more obvious.Its shortcoming is, after setting under the lower pressure, packing element tightly is attached on the casing wall, when operating pressure improves, the tubing string wriggling will cause the packing element ferrule to move final damage packing element with central tube, therefore in super dark superelevation kill-job, because the tubing string crawl is outstanding, the success rate of use inflatable packer is low, period of validity short.
At present, in order to prevent that the tubing string wriggling from causing inflatable packer to set inefficacy, often adopt the supporting use of hydraulic anchor and inflatable packer, when suppressing in the oil pipe, inflatable packer sets, hydraulic anchor is started working simultaneously, and oil pipe is fixed on casing anchor, and this mode can prevent the tubing string wriggling to a certain extent; But when in the oil pipe during release, because hydraulic anchor loses the grappling effect, oil pipe may form wriggling, for the inflatable packer of deblocking not during release in the oil pipe, easier working the mischief.Moreover the anchoring strength of hydraulic anchor is limited, when operting differential pressure is big, may occur sliding, and that is to say that only depend on the grappling of hydraulic anchor, the safety factor not hydraulic packer with slips is big, can not guarantee that tubing string do not wriggle.
If adopt Y241 packer, hydraulic anchor and the inflatable packer of band slips to be used (seeing accompanying drawing 1), since conventional Y241 packer set pressure ratio inflatable packer height, might be before the Y241 packer setting, inflatable packer damages.If adopt Y221 packer, hydraulic anchor and the supporting use of inflatable packer (seeing accompanying drawing 2), for ultradeep well, there is risk in moment of torsion transmission aspect.
Summary of the invention
The objective of the invention is to: provide a kind of in the dispensing of using inflatable packer to form, acidifying, fracturing string, set device by isolation oil pipe is divided into two pressure systems up and down, and the waterpower anchor packer that is positioned at its top is set prior to the inflatable packer of bottom, make the waterpower anchor packer set the back bottom tubing string is weighed anchor earlier and decide the suspension effect, to solve the problem that causes wriggling after the bottom tubing string pressurizes.And isolation is set after the plug salvaged in the device pulls out, for constructions such as setting in the follow-up oil pipe, dropping-fishing test provide enough big passage, make to isolate to set device and do not influence the back and set, allocate preventing that tubing string from wriggling and causing inflatable packer to set the method for inefficacy of constructions such as test, acidifying, pressure break normally.
The present invention realizes above-mentioned purpose by the following technical solutions:
A kind of method that prevents that the tubing string wriggling from causing packer setting to lose efficacy, it is characterized in that: it may further comprise the steps:
The first step is gone into the well; The separate injection tubing string that sets device+join partially+inflatable packer+join partially+circulation valve+screen casing plug by tubing string+telescoping tube+hydraulic anchor+Y241 packer+isolation is gone into the well, wherein, the eccentric injection mandrel band is empty stifled, isolate setting device bottom oil jacket and is communicated with when assurance is gone into the well, add and subtract oil pipe and pipe nipple by designing requirement between the instrument;
In second step, isolation sets the device upper packer and sets; When setting, suppress from oil pipe, pressure sets in isolation can not enter under the buffer action of device to isolate and sets the device bottom; Rising along with pressure, isolate the hydraulic anchor that sets device top and at first work, when pressure rose to 9～15 Mpa, the waterpower anchor packer set and anchoring string, when pressure rose to 15～21 Mpa, the work pin of telescoping tube was cut off and is started working under hydraulic action;
The 3rd step, continue pressurization again: when pressure rises to 21～25Mpa, isolating the pin that sets that sets on the device is cut off, it is descending with setting sliding sleeve to salvage plug, set sealing ring on the sliding sleeve and leave the seal section of top connection, the highly pressurised liquid that isolation is set in the oil pipe of device top is discharged in the oil pipe of bottom through isolating the space that sets between sliding sleeve and the top connection that sets in the device, until entering the stratum, ground shows that tubing pressure descends suddenly, stop to suppress this moment, isolates the waterpower anchor packer process of setting that sets device top and finish;
In the 4th step, salvage plug: utilize steel wire and fishing tool that the plug salvaged that isolation sets on the device is pulled out by well testing truck, for the setting of lower tool, dropping-fishing test provide passage;
The 5th step, isolation sets the device lower packer and sets: before setting, utilization is thrown to eccentric injection mandrel and is set the sliding sleeve pitching with the blanking plug of dead mouth with to the bottom, make and isolate that oil jacket is not communicated with in the dispensing set device bottom band inflatable packer, acidifying, the fracturing tool string, set the pressure requirement from well head by inflatable packer then and suppress, the inflatable packer that makes isolation set the device bottom sets;
In the 6th step, test envelope, dropping-fishing test, allotment, acidifying, pressing crack construction by the specific requirement of dispensing, acidifying, FRACTURING DESIGN again.
Described isolation set device by can salvage plug, top connection, set sliding sleeve, set pin, lower contact, sealing ring, salvaging hangnail, release step, pressure relief vent constitute, top connection and lower contact are by being threaded, be equipped with in the top connection and set sliding sleeve, set to be equipped with in the sliding sleeve and can salvage plug, the end that sets sliding sleeve and lower contact is affixed by setting pin.
Can set the tool string that the assembly of device upper and lower is made up of hydraulic anchor, waterpower anchor packer and inflatable packer in isolation respectively by the requirement of acid fracturing in the described first step.
The big I of the pressure of suppressing in oil pipe in described second step, the 3rd step and the 5th step requires to adjust according to reality.
This method is applicable to that also other is by the waterpower compression packer of band slips and the acid fracturing tubing string of inflatable packer assembly, only need between waterpower compression packer and inflatable packer, to add to isolate to set device, make as stated above to be positioned at and isolate the waterpower anchor packer set device top and set, pull out again and can salvage plug and get final product prior to the inflatable packer of bottom.
The invention has the advantages that:
1, utilizes isolation to set device oil pipe is divided into two pressure systems up and down, not to adopt conventional once suppressing to set, but the mode that adopts segmentation to set for twice changed inflatable packer and waterpower anchor packer and set in proper order, and the waterpower anchor packer is set prior to inflatable packer.
2, after the waterpower anchor packer process of setting that isolation sets device top is finished, the tubing string that isolation is set the device bottom has a grappling suspension effect, can effectively prevent to set, the tubing string wriggling causes inflatable packer to set inefficacy in the water filling, acidifying, fracturing process.
3, owing to isolate to set and set on the device after pin cuts off, it is descending with setting sliding sleeve to salvage plug, sets the seal section that sealing ring on the sliding sleeve leaves top connection, after the oil pipe mesohigh liquid release of top, is convenient to pull out and can salvages plug.
4, isolation is set after the plug salvaged on the device pulls out,, make to isolate to set device and do not influence conventional allotment test, acidifying and pressing crack construction for the setting of its underpart instrument, dropping-fishing test provide enough passages.
Description of drawings:
Fig. 1 is the eccentric separate injection tubing string that hydraulic anchor of the prior art, Y241 packer and inflatable packer are formed;
Fig. 2 is the eccentric separate injection tubing string that hydraulic anchor of the prior art, Y221 packer and inflatable packer are formed;
Fig. 3 is the layering acid fracturing tubing string that hydraulic anchor of the prior art, Y241 packer are formed;
Fig. 4 is the eccentric separate injection tubing string of forming by telescoping tube, hydraulic anchor, Y241 packer, isolation packer, eccentric injection mandrel and KX341 inflatable packer that this method provides;
The layering acid fracturing tubing string that Fig. 5 is the hydraulic anchor, the Y241 packer that provide by this method, set isolator, the K341 packer is formed;
Fig. 6 isolates the structural representation that sets device.
Among the figure: 1, can salvage plug, 2, top connection, 3, set sliding sleeve, 4, set pin, 5, lower contact, 6, sealing ring, 7, salvage hangnail, 8, the release step, 9, pressure relief vent.
Specific implementation method
This prevents that the tubing string wriggling from causing the method for packer setting inefficacy to be applicable to the oil pipe tubing string of depositing, be example (seeing accompanying drawing 3) now with two-layer eccentric separate injection tubing string, the layered water injection pipe rod structure that uses is made up of the tool string that tubing string+telescoping tube+hydraulic anchor+Y241 packer+isolation sets device+eccentric injection mandrel+K341 inflatable packer+eccentric injection mandrel+circulation valve+screen casing plug, wherein telescoping tube stretches to oil pipe and has compensate function, hydraulic anchor has the grappling oil pipe and prevents to scurry function, the Y241 packer has slips, has under the tubing string of preventing to scurry, the function of Seal Oil cover annular space.Isolate and to set device by salvaging plug 1, top connection 2, set sliding sleeve 3, set pin 4, lower contact 5, sealing ring 6, salvaging hangnail 7, release step 8, pressure relief vent 9 and constitute.Top connection 2 and lower contact 5 are equipped with in the top connection 2 and are set sliding sleeve 3 by being threaded, and set to be equipped with in the sliding sleeve 3 and can salvage plug 1, and it is affixed by setting pin 4 with the end of lower contact 5 to set sliding sleeve 3.
Described isolation sets the shearing force that sets pin 4 on the device shearing force greater than the work pin on the telescoping tube, and the shearing force of the pin of working on the telescoping tube is greater than the shearing force that sets pin on the waterpower anchor packer.Isolate and set the minimum latus rectum of the minimum latus rectum of sliding sleeve in the device greater than eccentric injection mandrel, isolate set device in top connection 2, set sliding sleeve 3, can salvage under the effect of the sealing ring on the plug 1, oil pipe is divided into two disconnected pressure systems up and down, it is disconnected that isolation sets device top oil jacket, set when going into the well joining partially of device bottom in isolation and not to be with dead mouth, promptly the bottom oil jacket is communicated with.
This prevents that tubing string wriggling from causing the concrete construction sequence of the method that packer setting lost efficacy as follows:
The first step is gone into the well; The tool string that sets device+eccentric injection mandrel+K341 inflatable packer+eccentric injection mandrel+circulation valve+screen casing plug by tubing string+telescoping tube+hydraulic anchor+Y241 packer+isolation is gone into the well, wherein eccentric injection mandrel is not with dead mouth, guarantees that isolation sets device bottom oil jacket and is communicated with.
In second step, isolation sets the device upper packer and sets; When setting, from oil pipe, suppress earlier, because isolating the buffer action pressure set device can not be delivered to isolate and set the device bottom, isolate and set in the instrument on device top, along with the rising of pressure, hydraulic anchor is work earlier, secondly is Y241 packer setting and anchoring string, be that telescoping tube work pin is cut off then, telescoping tube plays and slows down the effect that sets device top oil pipe wriggling of isolating.
The 3rd step, continue pressurization again: cut off up to the pin 4 that sets that isolation sets on the device, it is descending with setting sliding sleeve 3 to salvage plug 1, set sealing ring on the sliding sleeve 3 and leave seal section in the top connection 2, the highly pressurised liquid that isolation is set in the oil pipe of device top is discharged in the oil pipe of bottom through isolating the space that sets between sliding sleeve 3 and the top connection 2 that sets in the device, until entering the stratum, ground shows that tubing pressure descends suddenly, stop to suppress this moment, isolates the Y241 packer setting process that sets device top and finish;
In the 4th step, salvage plug: during salvaging, utilize steel wire and fishing tool that the plug salvaged that isolation sets on the device is pulled out by well testing truck, mediation oil pipe passage is for the setting of lower tool, dropping-fishing test provide passage;
In the 5th step, isolate to set the device lower packer and set: before setting, earlier eccentric injection mandrel is thrown dead mouth, make to isolate to set device bottom oil jacket and be not communicated with, suppress and set by the pressure requirement (in the general 2Mpa) that sets of K341 then.
Above-mentioned five steps are tested follow-up constructions such as envelope, dropping-fishing test, allotment by the specific requirement of dispensing design after finishing again.
Lift a concrete case study on implementation below; but the technical scheme that the present invention protected is not limited only to this embodiment; promptly in preventing method that tubing string wriggling causes packer setting to lose efficacy, this adopt any isolation to set device or other structure akin with it; oil pipe is divided into two different pressure systems up and down; allow its top waterpower anchor packer prior to following packer setting; isolation is set device bottom tubing string weigh anchor and decide the suspension effect, prevent water filling; acidifying; the tubing string wriggling causes the method that packer setting lost efficacy all to belong to the scope that technical scheme of the present invention is protected in the fracturing process.
Case study on implementation:
As shown in Figure 1, certain oil field DK440 well is a bite ultradeep well, and well depth reaches 5593.75 meters, is respectively the sleeve pipe of Ф 339.27mm and Ф 244.48mm more than 5370.37 meters, and the bottom is the barefoot interval that the 215.9mm drill bit is beaten.For barefoot interval is implemented seperated layer water injection, we select expanding open hole packer for use, simultaneously, consider of the influence of oil pipe wriggling, use hydraulic anchor and Y241 packer in the bottom of Ф 244.48mm sleeve pipe, during construction inflatable packer, after having descended tubing string, suppress from oil pipe, when pressure rises to 1Mpa, the expanding open hole Fengkai beginning sets, hydraulic anchor is started working, when pressure rises to 5 Mpa, voltage stabilizing 3min clock does not have pressure drop, and pressure drops to 0 suddenly when continuing to be forced into 9 Mpa, tripping out tubing string finds, the explosion of expanding open hole envelope thinks that expanding open hole is enclosed in 1 Mpa and sets, because the hydraulic anchor anchorage force is not enough, when pressure rises to 9 Mpa,, after the tubing string elongation packing element is destroyed because bore hole sealing tube firmly is enclosed on the borehole wall.
When going into the well for the second time, to such an extent as to set prior to the waterpower anchor packer and appear at the waterpower anchor packer and do not have the phenomenon that inflatable packer has just damaged before the grappling for fear of inflatable packer occurring, use the Y221 packer instead and replace the Y241 packer, as shown in Figure 2, method is after having descended tubing string, just changeing and setting the Y221 packer, allow the grappling of Y221 packer hang tubing string, reduce of the influence of tubing string wriggling to inflatable packer, and then setting inflatable packer, result of implementation is, because well depth, moment of torsion transmits difficulty, the failure of Y221 packer setting.
Use the method that prevents that the tubing string wriggling from causing packer setting to lose efficacy of the present invention instead:
The downhole tool combination sets device+eccentric injection mandrel+K341 open hole packer+eccentric injection mandrel+circulation valve+screen casing plug by tubing string+telescoping tube+hydraulic anchor+Y241 packer+isolation.As shown in Figure 3.
Wherein, isolate and set device as shown in Figure 6, by salvaging plug 1, top connection 2, set sliding sleeve 3, set pin 4, lower contact 5, sealing ring 6, salvage hangnail 7, release step 8, pressure relief vent 9 constitutes, top connection 2 tops have screw thread to be connected with the top oil pipe, the bottom has screw thread to be connected with lower contact, the lower contact bottom has screw thread bottom oil pipe to connect, lower contact is by setting pin 4 and setting sliding sleeve and be connected, can salvage plug 1 and set the sealing ring sealing is arranged between the sliding sleeve 3, set the sealing ring sealing is arranged between sliding sleeve 3 and the top connection 2, by salvaging plug 1, set sliding sleeve 3, the sealing of sealing ring between the top connection 2 can about oil pipe be separated into disconnected two pressure systems, pressure relief vent 9 is arranged at the bottom that sets the last sealing ring of sliding sleeve 3, the release step 8 that an internal diameter sudden enlargement is arranged with the bottom that sets sliding sleeve 3 seal sections in top connection 2, set the minimum diameter of the minimum diameter of sliding sleeve 3, can salvage to be manufactured with on the plug 1 and salvage hangnail 7 greater than eccentric injection mandrel.
Construction sequence:
The first step is gone into the well.The tubular column structure that sets device+eccentric injection mandrel+K341 open hole packer+eccentric injection mandrel+circulation valve+screen casing plug by tubing string+telescoping tube+hydraulic anchor+Y241 packer+isolation is gone into the well, as Fig. 3.The mouth of wherein not feigning death on two plug for eccentricity hole makes to isolate to set device bottom oil jacket and be communicated with.
In second step, isolation sets the device upper packer and sets.When setting, from oil pipe, suppress earlier, owing to isolate the buffer action that sets device, isolate and set in the instrument on device top, along with the rising of pressure, hydraulic anchor is work earlier, secondly is that Y241 waterpower anchor packer sets and anchoring string, be that telescoping tube work pin is cut off then, telescoping tube plays and slows down the effect that sets device top oil pipe wriggling of isolating.
The 3rd step, continue pressurization again, isolate the pin that sets that sets on the device up to cutting off, it is descending with setting sliding sleeve to salvage plug, set that sealing ring has left the seal section in the top connection on the sliding sleeve, be seated on the upper surface of lower contact, isolate and set device top oil pipe mesohigh liquid through isolating the space that sets between device inner sliding sleeve and the top connection, set the pressure relief vent on the sliding sleeve, the space that sets sliding sleeve and can salvage between the plug bottom is discharged in the oil jacket of bottom, until entering the stratum, ground shows that tubing pressure descends suddenly, stop to suppress this moment, and isolation sets the device top waterpower anchor packer process of setting and finishes.
In the 4th step, salvaging can be salvaged plug.During salvaging, well testing truck utilizes steel wire and fishing tool that the plug salvaged that isolation sets on the device is pulled out, for the setting of lower tool, dropping-fishing test provide passage.
In the 5th step, isolation sets the device lower packer and sets.Before setting, two eccentric injection mandrels are thrown blanking plug with dead mouth, oil jacket is not communicated with, set the pressure requirement from well head by inflatable packer then and suppress to set and isolate the inflatable packer that sets the device bottom.
Test envelope, dropping-fishing test, allotment construction by the specific requirement of dispensing design at last.
Another case study on implementation: as Fig. 4, it is the layering acid fracturing tubing string that hydraulic anchor of the prior art, Y241 packer are formed, its shortcoming is that the Y241 sealing performance is not as K341, and easy sand setting causes Y241 deblocking difficulty between the following two-stage Y241, and after improving by this programme by hydraulic anchor, Y241 packer, set the layering acid fracturing tubing string that isolator, K341 packer are formed, as Fig. 5, overcome above-mentioned shortcoming, solve high pressure and caused the influence of tubing string wriggling to K341, the Y241 deblocking difficult problem of also having avoided sand setting to cause simultaneously.The process that sets is identical with last example, just two eccentric injection mandrels is thrown blanking plug with dead mouth in the 5th step and changes pitching into and enter the bottom and set sliding sleeve.
Claims (5)
1. one kind prevents that the tubing string wriggling from causing the method for packer setting inefficacy, and it is characterized in that: it may further comprise the steps:
The first step is gone into the well; The separate injection tubing string that sets device+join partially+inflatable packer+join partially+circulation valve+screen casing plug by tubing string+telescoping tube+hydraulic anchor+Y241 packer+isolation is gone into the well, wherein, the eccentric injection mandrel band is empty stifled, isolate setting device bottom oil jacket and is communicated with when assurance is gone into the well, add and subtract oil pipe and pipe nipple by designing requirement between the instrument;
In second step, isolation sets the device upper packer and sets; When setting, suppress from oil pipe, pressure sets in isolation can not enter under the buffer action of device to isolate and sets the device bottom; Rising along with pressure, isolate the hydraulic anchor that sets device top and at first work, when pressure rose to 9～15 Mpa, the waterpower anchor packer set and anchoring string, when pressure rose to 15～21 Mpa, the work pin of telescoping tube was cut off and is started working under hydraulic action;
The 3rd step, continue pressurization again: when pressure rises to 21～25Mpa, isolating the pin (4) that sets that sets on the device is cut off, it is descending with setting sliding sleeve (3) to salvage plug (1), set sealing ring (6) on the sliding sleeve (3) and leave the seal section of top connection, make and isolate the highly pressurised liquid set in the oil pipe of device top and set sliding sleeve (3) and top connection (2) in the device through isolating to set, the space that can salvage between the plug (1) is discharged in the oil pipe of bottom, until entering the stratum, ground shows that tubing pressure descends suddenly, stop to suppress this moment, isolates the waterpower anchor packer process of setting that sets device top and finish;
In the 4th step, salvage plug: utilize steel wire and fishing tool that the plug salvaged (1) that isolation sets on the device is pulled out by well testing truck, mediation oil pipe passage is for the setting of lower tool, dropping-fishing test provide passage;
The 5th step, isolation sets the device lower packer and sets: before setting, utilization is thrown to eccentric injection mandrel and is set the sliding sleeve pitching with the blanking plug of dead mouth with to the bottom, make and isolate that oil jacket is not communicated with in the dispensing set device bottom band inflatable packer, acidifying, the fracturing tool string, set the pressure requirement from well head by inflatable packer then and suppress, the inflatable packer that makes isolation set the device bottom sets;
In the 6th step, test envelope, dropping-fishing test, allotment, acidifying, pressing crack construction by the specific requirement of dispensing, acidifying, FRACTURING DESIGN again.
2. a kind of method that prevents that the tubing string wriggling from causing packer setting to lose efficacy according to claim 1, it is characterized in that: described isolation sets device by top connection (2), lower contact (5), set sliding sleeve (3), can salvage plug (1), sealing ring (6), set pin (4), salvage hangnail (7), release step (8), pressure relief vent (9) is formed, top connection (2) and lower contact (5) are by being threaded, be equipped with in the top connection (2) and set sliding sleeve (3), set to be equipped with in the sliding sleeve (3) and can salvage plug (1), the end that sets sliding sleeve (3) and lower contact (5) is affixed by setting pin (4).
3. a kind of method that prevents that the tubing string wriggling from causing packer setting to lose efficacy according to claim 1, it is characterized in that: described isolation sets under the hydraulic action of device in the oil pipe of top, set pin (4) by after being cut off, it is descending with setting sliding sleeve (3) to salvage plug (1), set sealing ring (6) on the sliding sleeve (3) and leave the seal section of top connection (2), make isolate the highly pressurised liquid that sets in the oil pipe of device top through isolation set in the device set pressure relief vent (9) on the sliding sleeve (3) and the interstitial channels of the formation of the release step (8) in the top connection (2) is discharged in the oil pipe of bottom.
4. a kind of method that prevents that the tubing string wriggling from causing packer setting to lose efficacy according to claim 1 is characterized in that: can set the tool string that the assembly of device upper and lower is made up of hydraulic anchor, waterpower anchor packer and inflatable packer in isolation respectively by the requirement of acid fracturing in the described first step.
5. a kind of method that prevents that the tubing string wriggling from causing packer setting to lose efficacy according to claim 1 is characterized in that: the pressure size of suppressing in oil pipe in described second step, the 3rd step and the 5th step requires to adjust accordingly according to reality.
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| CN 201110222603 CN102268972B (en) | 2011-08-04 | 2011-08-04 | Method for preventing setting failure of packer resulted from creeping of pipe string |
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| CN 201110222603 CN102268972B (en) | 2011-08-04 | 2011-08-04 | Method for preventing setting failure of packer resulted from creeping of pipe string |
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