CN204436357U - A kind of many showers hole fracturing string - Google Patents
A kind of many showers hole fracturing string Download PDFInfo
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- CN204436357U CN204436357U CN201420747856.0U CN201420747856U CN204436357U CN 204436357 U CN204436357 U CN 204436357U CN 201420747856 U CN201420747856 U CN 201420747856U CN 204436357 U CN204436357 U CN 204436357U
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Abstract
The utility model discloses a kind of many showers hole fracturing string.The abrasive perforating stage of this fracturing string, according to order from the top down, abrasive perforating is carried out to perforated interval each in same fracturing section, and in the end after secondary abrasive perforating, by fracturing base fluid, load fluid in the fracturing string of many showers hole is replaced above the inclination section of pit shaft, and do not replace out from pit shaft, like this when injecting prepad fluid in the annular space between pit shaft and many showers hole fracturing string, perforation sand in load fluid will in the certain shutoff of the cracking initiation of front unlatching, be beneficial to open in the crack of rear perforated interval, therefore the utility model will make the crack opening degree of each bunch of perforated interval in same section consistent, thus improve reliability and the efficiency of construction of segmentation many bunches of pressure breaks.
Description
Technical field
The utility model relates to a kind of many showers hole fracturing string.
Background technology
At present, in domestic horizontal well pit shaft, the technique of staged fracturing is mainly coiled tubing staged fracturing and can bores bridging plug staged fracturing.Coiled tubing staged fracturing technique is coiled tubing abrasive perforating, and annular space sand fracturing can realize fairly large pressure break.Pressure break one section stays one section of sand plug as isolation after terminating in pit shaft, drag tubing string and carry out pressure break to next object section, the shortcoming of this technique is long construction period, and sand plug rinses difficulty etc.Bridging plug staged fracturing technique can be bored and can realize many bunches of pressure breaks, utilize hydraulic pump power transmission cable and bridging plug tool string to target zone, igniting sets bridging plug, on carry perforating gun to object section perforation after, trip out perforating gun tool string, wellbore fracture, its shortcoming is that pumping bridging plug tool string can cause larger crossing to replace to next section, and wellbore fracture, if occur, the process of construction abnormal conditions is comparatively difficult.
Chinese patent literature 201210517644.9 discloses one " horizontal well coiled tubing hydraulic sand blasting many showers orifice ring sky adds sand multistage fracturing technology ", enter to spray fracturing tool string under adopting coiled tubing, annular space sand fracturing after perforation, next section of construction is mentioned afterwards, available one-trip string completes perforation and pressure break, and realizes segmentation many bunches of pressure breaks.Defect is that it adopts single spraying rifle, easy generation perforation imperfection and cause ground lamination do not open, packer used is hydraulic base sealed packer, after must carrying out anti-flushing well, ability carries coiled tubing after every section of pressure break terminates, and easily deblocking occurs when coiled tubing discharge capacity is lower.In addition, after perforation completes, load fluid will be replaced out completely from pit shaft, like this in fracturing process, liquid mainly enters from first crack of opening, to be unfavorable for that the crack of follow-up perforated interval is opened like this, so that in fracturing section, the crack opening degree in each shower hole is different, is unfavorable for follow-up oil producing operation.
Utility model content
The purpose of this utility model is to provide the many shower hole fracturing string of a kind of raising with the cracking degree in fracturing section middle and later periods shower hole.
In order to realize above object, in the utility model, the technical scheme of many showers hole fracturing string is as follows:
Many showers hole fracturing string, comprise and be serially connected in ejector on the mouth of pipe of oil pipe lower end and packer, packer is in the below of ejector, and packer is mechanical setting type packer, and ejector has two or more and is connected in series successively along the vertical direction.
Circulating valve is serially connected with between ejector and packer.
The below of packer is serially connected with brake pad, locator and target seeker from top to bottom successively.
The top of ejector is serially connected with centralizer, standing valve from bottom to top successively, gives up safely.
The abrasive perforating stage in the utility model, according to order from the top down, abrasive perforating is carried out to perforated interval each in same fracturing section, and in the end after secondary abrasive perforating, by fracturing base fluid, load fluid in the fracturing string of many showers hole is replaced above the inclination section of pit shaft, and do not replace out from pit shaft, like this when injecting prepad fluid in the annular space between pit shaft and many showers hole fracturing string, perforation sand in load fluid will in the certain shutoff of the cracking initiation of front unlatching, be beneficial to open in the crack of rear perforated interval, directly to the mode suppressing the crack unlatching realizing perforated interval in pit shaft compared to existing technology, the utility model will make the crack opening degree of each bunch of perforated interval in same section consistent, thus improve reliability and the efficiency of construction of segmentation many bunches of pressure breaks.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of many showers hole of the present utility model fracturing string.
Detailed description of the invention
The embodiment of many showers hole fracturing string in the utility model: as shown in Figure 1, this tubing string comprises that the coiled tubing 1, oil connection 2, the safety that are connected in series successively give up 3, standing valve 4, first centralizer 5, second centralizer 6, first ejector 7, second ejector 8, circulating valve 9, packer 10, brake pad 11, mechanical positioners 12, target seeker 13 from top to bottom, and wherein packer 10 is mechanical setting type packers.
When utilizing this tubing string to carry out the staged fracturing of pit shaft well cementation completion horizontal well, for two bunches every section, the implementation process of summary coiled tubing sandblasting many showers hole annular fracturing string matching technique, comprises the following steps:
1) many showers hole fracturing string is assembled, and pump pressure testing is walked to 70MPa to pressure break pipeline and well head, 30min internal drop is no more than 0.5MPa, well head and pipeline stingless, leak, it is qualified for oozing phenomenon, and to relief line pressure testing 35MPa, 30min internal drop is no more than 0.5MPa, pipeline is stingless, leak, it is qualified for oozing phenomenon, as shown in Figure 1, this many showers hole fracturing string comprises the coiled tubing 1 be connected in series successively from top to bottom, oil connection 2, safety gives up 3, standing valve 4, first centralizer 5, second centralizer 6, first ejector 7, second ejector 8, circulating valve 9, packer 10, brake pad 11, mechanical positioners 12, target seeker 13, wherein packer 10 is mechanical setting type packers,
2) according to abrasive perforating and the requirement of upper lifting pipe post, be not less than with ground control back pressure and set front well head pressure for Controlling principle, get out the oil nozzle of 2-14mm in advance, and start pump truck, stablize pump truck output at perforation discharge capacity 1.6m
3/ min, records now oil nozzle gage pressure, and the force value shown by this pressure meter is oil nozzle can control back pressure;
3) by the fracturing string lower going-into-well cylinder of many showers hole, the running speed of many showers hole fracturing string is advisable with 10-15m/min, test is set when transferring 100m, and after setting and being completed, many showers hole fracturing string is transferred to perforating depth, then at the uniform velocity on carry the coiled tubing 1 of many showers hole fracturing string, observe the fluctuation that mechanical positioners 12 produces through box cupling, to calibrate packer 10 setting depth;
4) school deeply qualified after, set by packer 10 technical requirements, namely suppress 30MPa and test envelope, when 10min pressure drop is less than 0.5MPa, test involution lattice;
5) after testing involution lattice, open well head blowout oil nozzle manifold, improve perforation pumpage simultaneously, annulus back pressure in the annular space between pit shaft and many showers hole fracturing string is kept to be not less than setting front pressure 2-5MPa, and by fracturing blender truck, 40/70 order quartz sand is mixed with sandblasting liquid, the perforation lapping liquid that fracturing blender truck stirs by perforation pump truck by coiled tubing 1 with 1.6m
3the discharge capacity of/min pumps in well, to target zone position perforation;
6), after perforation completes, stop adding sand, continue with 1.6m
3the discharge capacity of/min pumps into fracturing base fluid, pumps into the fracturing base fluid of a pit shaft height, so that load fluid residual in coiled tubing 1 is replaced out pit shaft;
7) after the displacement fluid in the first shower hole has been beaten, close pit shaft gate, above carry deblocking packer 10;
8) continue to transfer below many showers hole fracturing string to this fractured interval second shower hole depth, then at the uniform velocity on carry the coiled tubing 1 of many showers hole fracturing string, and observe the fluctuation that mechanical positioners 12 produces through box cupling, to calibrate packer 10 setting depth to design attitude;
9) school deeply qualified after, set by packer 10 technical requirements, wherein test envelope and directly to be suppressed by pit shaft and test envelope for first bunch, and second bunch is tested envelope employing: again judge whether second bunch of packer 10 sets in the examination stage of squeezing by fracture pressure and operation pressure change, namely by the slow release of pit shaft gate, until Pressure Drop extremely 5MPa lower than last layer section termination of pumping pressure, then pit shaft gate is closed rapidly, observe casing pressure situation of change, if cover is pressed in not change in 5min, then test involution lattice;
10) after testing involution lattice, open well head blowout oil nozzle manifold, improve perforation pumpage simultaneously, annulus back pressure is kept to be not less than setting front pressure 2-5MPa, fracturing blender truck work, the perforation lapping liquid that fracturing blender truck is stirred by 40/70 order quartz sand and sandblasting liquid mixing perforation pump truck by coiled tubing 1 with 1.6m
3the discharge capacity of/min pumps in well, to target zone position perforation;
11), after perforation completes, stop adding sand, continue with 1.6m
3the discharge capacity of/min pumps into fracturing base fluid, and load fluid residual in the fracturing string of many showers hole is replaced the above 200m of inclination section;
12) main pressure break flow process is opened, by the construction of construction infusion program list, namely in mineshaft annulus, first pump into prepad fluid suppress again and carry out pressure break, and in work progress, coiled tubing 1 pressure limiting 60MPa, in mineshaft annulus, Stress control is within pit shaft resistance to compression, in fracturing process, coiled tubing 1 continues pump liquid by fluid infusion pump truck, and discharge capacity is 0.2-0.4m
3/ min;
13) after displacement fluid has been beaten, fluid infusion pumpage is improved to 0.5m
3/ min, and on carry deblocking packer 10;
14) carry coiled tubing 1 on, above (5-14) step of circulation, to complete each section of construction below.
In the present embodiment, fracturing process is after the second shower hole is terminated, perforation sand is not ejected annular space, and in the shutoff that pad stage utilizes it certain to the first cracking initiation opened, be beneficial to the unlatching in second bunch of perforated interval crack, form two cracks, realize the object of segmentation many bunches of pressure breaks; Adopt two spray gun, avoid single spraying rifle perforation imperfection in existing technique and cause the defect that ground lamination is not opened: adopting mechanical set packer 10, setting action is without the need to chock pressure difference, reliability is better than hydraulic base sealed packer 10, and without the need to anti-flushing well after every section of pressure, substantially increase efficiency of construction and safety.
In the above-described embodiments, this fracturing process carries out every section of two bunches of pressure breaks, and in other embodiments, the number of clusters of the perforation of each fracturing section also can be greater than two.
Claims (4)
1. more than shower hole fracturing string, is characterized in that, comprise and be serially connected in ejector on the mouth of pipe of oil pipe lower end and packer, packer is in the below of ejector, and packer is mechanical setting type packer, and ejector has two or more and is connected in series successively along the vertical direction.
2. many showers hole according to claim 1 fracturing string, is characterized in that, be serially connected with circulating valve between ejector and packer.
3. many showers hole according to claim 1 fracturing string, is characterized in that, the below of packer is serially connected with brake pad, locator and target seeker from top to bottom successively.
4. many showers hole according to claim 1 fracturing string, is characterized in that, the top of ejector is serially connected with centralizer, standing valve from bottom to top successively, gives up safely.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420747856.0U CN204436357U (en) | 2014-12-03 | 2014-12-03 | A kind of many showers hole fracturing string |
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| CN201420747856.0U CN204436357U (en) | 2014-12-03 | 2014-12-03 | A kind of many showers hole fracturing string |
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| CN204436357U true CN204436357U (en) | 2015-07-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104564001A (en) * | 2014-12-03 | 2015-04-29 | 中国石油化工股份有限公司 | Horizontal well multi-cluster fracturing method and multi-cluster perforating and fracturing pipe column for implementing method |
-
2014
- 2014-12-03 CN CN201420747856.0U patent/CN204436357U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104564001A (en) * | 2014-12-03 | 2015-04-29 | 中国石油化工股份有限公司 | Horizontal well multi-cluster fracturing method and multi-cluster perforating and fracturing pipe column for implementing method |
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| GR01 | Patent grant |