CN104564001A - Horizontal well multi-cluster fracturing method and multi-cluster perforating and fracturing pipe column for implementing method - Google Patents

Horizontal well multi-cluster fracturing method and multi-cluster perforating and fracturing pipe column for implementing method Download PDF

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Publication number
CN104564001A
CN104564001A CN201410722643.7A CN201410722643A CN104564001A CN 104564001 A CN104564001 A CN 104564001A CN 201410722643 A CN201410722643 A CN 201410722643A CN 104564001 A CN104564001 A CN 104564001A
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CN
China
Prior art keywords
fracturing
many
perforating
fracturing string
packer
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CN201410722643.7A
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Chinese (zh)
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CN104564001B (en
Inventor
王越
李克智
秦玉英
何青
陈付虎
李国锋
罗懿
张永春
姚昌宇
胡艾国
Original Assignee
中国石油化工股份有限公司
中国石油化工股份有限公司华北分公司工程技术研究院
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Priority to CN201410722643.7A priority Critical patent/CN104564001B/en
Publication of CN104564001A publication Critical patent/CN104564001A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11Perforators; Permeators
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • E21B43/267Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping

Abstract

The invention discloses a horizontal well multi-cluster fracturing method and a multi-cluster perforating and fracturing pipe column for implementing the method. In a sand blasting and perforating phase, each perforating section in the same fracturing section is subjected to sand blasting and perforating according to the sequence from top to bottom; after the last time of sand blasting and perforating is finished, sand-carrying liquid in the multi-cluster perforating and fracturing pipe column is substituted to the position above a building up section of a shaft through fracturing base liquid but is not substituted from the shaft, so that when prepad fluid is filled into an annular space between the shaft and the multi-cluster perforating and fracturing pipe column, perforating sand in the sand-carrying liquid blocks a crack opened in the front perforating section to certain degree, and a crack is conveniently opened in a rear perforating section. The opening degrees of the cracks of cluster perforating sections in the same section are consistent, and the reliability and the construction efficiency of section-to-section multi-cluster fracturing are improved.

Description

The method of horizontal well many bunches of pressure breaks and many showers hole fracturing string of enforcement the method
Technical field
The present invention relates to the method for a kind of horizontal well many bunches of pressure breaks and implement many showers hole fracturing string of the method.
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.
Summary of the invention
The object of this invention is to provide the method for a kind of raising with the horizontal well many bunches of pressure breaks of the cracking degree in fracturing section middle and later periods shower hole, additionally provide a kind of many showers hole fracturing string being exclusively used in the method implementing this horizontal well many bunches of pressure breaks simultaneously.
In order to realize above object, in the present invention, the technical scheme of the method for horizontal well many bunches of pressure breaks is as follows:
The method of horizontal well many bunches of pressure breaks, comprises the following steps:
Step one, along order from the top down, successively abrasive perforating is carried out to each bunch of perforated interval in the same fracturing section of pit shaft horizontal segment by many showers hole fracturing string, described many showers hole fracturing string comprises the mechanical packer and ejector that are connected in series from bottom to top, and between adjacent twice abrasive perforating, after load fluid fracturing base fluid in the fracturing string of many showers hole being replaced out to outside pit shaft, again on carry mechanical packer and carry out deblocking;
Step 2, in the end after secondary abrasive perforating, replaces above the inclination section of pit shaft by load fluid fracturing base fluid in the fracturing string of many showers hole;
Step 3, after injecting prepad fluid, suppresses and carries out pressure break to each shower hole in the annular space between pit shaft and many showers hole fracturing string in this annular space.
In step 3, simultaneously to fluid infusion in the fracturing string of many showers hole.
In step 2, load fluid is replaced to the above 200m position of inclination section.
In step one, before carrying out abrasive perforating to first bunch of perforated interval, undertaken testing envelope by suppressing to the annular space between pit shaft and many showers hole fracturing string; Envelope mode of testing before carrying out abrasive perforating to all the other bunch of perforated interval adopts: by the slow release of pit shaft gate, until Pressure Drop is to 5MPa lower than last layer section termination of pumping pressure, then close pit shaft gate rapidly, observe casing pressure situation of change, if cover is pressed in not change in 5min, then test involution lattice.
Before step one, many showers hole fracturing string with the lower going-into-well cylinder of 10-15m/min, and in below to carrying out during 100m setting test.
In the present invention, 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.
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 present invention, 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 present invention 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 invention fracturing string.
Detailed description of the invention
The embodiment of the method for horizontal well many bunches of pressure breaks in the present invention: the method is a kind of coiled tubing sandblasting many showers orifice ring pneumatics cracking method being applicable to the staged fracturing of the pit shaft well cementation completion horizontal well of fine and close low-permeability reservoir, 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.
From other embodiments above, horizontal well of the present invention many bunches of fracturing process are implemented by following steps:
Step one, along order from the top down, successively abrasive perforating is carried out to each bunch of perforated interval in the same fracturing section of pit shaft horizontal segment by many showers hole fracturing string, described many showers hole fracturing string comprises the mechanical packer and ejector that are connected in series from bottom to top, and between adjacent twice abrasive perforating, after load fluid fracturing base fluid in the fracturing string of many showers hole being replaced out to outside pit shaft, again on carry mechanical packer and carry out deblocking;
Step 2, in the end after secondary abrasive perforating, replaces above the inclination section of pit shaft by load fluid fracturing base fluid in the fracturing string of many showers hole;
Step 3, after injecting prepad fluid, suppresses and carries out pressure break to each shower hole in the annular space between pit shaft and many showers hole fracturing string in this annular space.
The embodiment of many showers hole fracturing string in the present invention, in the present embodiment, the structure of many showers hole fracturing string is identical with the structure of many showers hole fracturing string in above-described embodiment, therefore repeats no more.

Claims (10)

1. the method for horizontal well many bunches of pressure breaks, is characterized in that, comprises the following steps:
Step one, along order from the top down, successively abrasive perforating is carried out to each bunch of perforated interval in the same fracturing section of pit shaft horizontal segment by many showers hole fracturing string, described many showers hole fracturing string comprises the mechanical packer and ejector that are connected in series from bottom to top, and between adjacent twice abrasive perforating, after load fluid fracturing base fluid in the fracturing string of many showers hole being replaced out to outside pit shaft, again on carry mechanical packer and carry out deblocking;
Step 2, in the end after secondary abrasive perforating, replaces above the inclination section of pit shaft by load fluid fracturing base fluid in the fracturing string of many showers hole;
Step 3, after injecting prepad fluid, suppresses and carries out pressure break to each shower hole in the annular space between pit shaft and many showers hole fracturing string in this annular space.
2. the method for horizontal well according to claim 1 many bunches of pressure breaks, is characterized in that, in step 3, simultaneously to fluid infusion in the fracturing string of many showers hole.
3. the method for horizontal well according to claim 1 and 2 many bunches of pressure breaks, is characterized in that, in step 2, load fluid is replaced to the above 200m position of inclination section.
4. the method for horizontal well according to claim 1 and 2 many bunches of pressure breaks, is characterized in that, in step one, before carrying out abrasive perforating to first bunch of perforated interval, is undertaken testing envelope by suppressing to the annular space between pit shaft and many showers hole fracturing string; Envelope mode of testing before carrying out abrasive perforating to all the other bunch of perforated interval adopts: by the slow release of pit shaft gate, until Pressure Drop is to 5MPa lower than last layer section termination of pumping pressure, then close pit shaft gate rapidly, observe casing pressure situation of change, if cover is pressed in not change in 5min, then test involution lattice.
5. the method for horizontal well according to claim 1 and 2 many bunches of pressure breaks, is characterized in that, before step one, many showers hole fracturing string with the lower going-into-well cylinder of 10-15m/min, and in below to carrying out during 100m setting test.
6. 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.
7. many showers hole according to claim 6 fracturing string, is characterized in that, ejector has two or more and is connected in series successively along the vertical direction.
8. the many showers hole fracturing string according to claim 6 or 7, is characterized in that, be serially connected with circulating valve between ejector and packer.
9. the many showers hole fracturing string according to claim 6 or 7, is characterized in that, the below of packer is serially connected with brake pad, locator and target seeker from top to bottom successively.
10. the many showers hole fracturing string according to claim 6 or 7, is characterized in that, the top of ejector is serially connected with centralizer, standing valve from bottom to top successively, gives up safely.
CN201410722643.7A 2014-12-03 2014-12-03 The method of many cluster pressure breaks of horizontal well and many cluster perforating and fracturing tubing strings of implementation the method CN104564001B (en)

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CN104989393A (en) * 2015-07-14 2015-10-21 北京博达瑞恒科技有限公司 Micro fracturing test method
CN105041274A (en) * 2015-07-10 2015-11-11 中国石油大学(北京) Short-range two-layer oil-gas reservoir commingled production technique
CN105696994A (en) * 2016-01-20 2016-06-22 中国石油化工股份有限公司 Device used for multidirectional pressure control type spraying-sealing fracturing and tubular column comprising same
CN106761645A (en) * 2016-12-28 2017-05-31 北京华晖盛世能源技术股份有限公司 The structure of Oil/gas Well prospect pit hydraulic slotted liner technique test technology tubing string
CN107476791A (en) * 2016-06-07 2017-12-15 中国石油化工股份有限公司 A kind of shale gas staged fracturing of horizontal well variable density cluster perforating methods and perforating gun
CN109184652A (en) * 2018-09-25 2019-01-11 中国石油天然气股份有限公司 Marmem pit shaft reproduces coiled tubing underseal refracturing method
CN109630083A (en) * 2018-11-22 2019-04-16 西南石油大学 A kind of abrasive perforating annular fracturing ground control system and method
CN109751018A (en) * 2017-11-01 2019-05-14 中国石油化工股份有限公司 A kind of construction method for normal pressure shale gas volume fracturing
CN109989723A (en) * 2017-12-29 2019-07-09 中国石油天然气股份有限公司 Explosion is given up more shower Kong Lianzuo pressure break sealing devices
CN110130867A (en) * 2019-04-16 2019-08-16 中国石油天然气股份有限公司 A kind of more cluster fracturing process of Slim Hole Sidetracking Technology horizontal well in segments

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CN104153753A (en) * 2014-08-26 2014-11-19 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 Horizontal well volume fracturing tubular column and method based on conventional oil tube pressure dragging
CN204436357U (en) * 2014-12-03 2015-07-01 中国石油化工股份有限公司 A kind of many showers hole fracturing string

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CN102691493A (en) * 2012-06-05 2012-09-26 中国石油化工股份有限公司 Continuous oil pipe sectional sand-blasting perforation casing fracturing pipe column and casing fracturing method
CN103032060A (en) * 2012-11-08 2013-04-10 中国石油天然气股份有限公司 Continuous oil pipe hydraulic sanding blasting multi-cluster perforation annular sanding staged fracturing process for horizontal well
CN104153753A (en) * 2014-08-26 2014-11-19 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 Horizontal well volume fracturing tubular column and method based on conventional oil tube pressure dragging
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105041274A (en) * 2015-07-10 2015-11-11 中国石油大学(北京) Short-range two-layer oil-gas reservoir commingled production technique
CN104989393A (en) * 2015-07-14 2015-10-21 北京博达瑞恒科技有限公司 Micro fracturing test method
CN105696994A (en) * 2016-01-20 2016-06-22 中国石油化工股份有限公司 Device used for multidirectional pressure control type spraying-sealing fracturing and tubular column comprising same
CN105696994B (en) * 2016-01-20 2018-06-12 中国石油化工股份有限公司 The device of envelope pressure is sprayed for multidirectional pressure control type and includes its tubing string
CN107476791B (en) * 2016-06-07 2019-05-17 中国石油化工股份有限公司 A kind of shale gas horizontal well fracturing variable density cluster perforating methods and perforating gun
CN107476791A (en) * 2016-06-07 2017-12-15 中国石油化工股份有限公司 A kind of shale gas staged fracturing of horizontal well variable density cluster perforating methods and perforating gun
CN106761645A (en) * 2016-12-28 2017-05-31 北京华晖盛世能源技术股份有限公司 The structure of Oil/gas Well prospect pit hydraulic slotted liner technique test technology tubing string
CN109751018A (en) * 2017-11-01 2019-05-14 中国石油化工股份有限公司 A kind of construction method for normal pressure shale gas volume fracturing
CN109989723A (en) * 2017-12-29 2019-07-09 中国石油天然气股份有限公司 Explosion is given up more shower Kong Lianzuo pressure break sealing devices
CN109184652A (en) * 2018-09-25 2019-01-11 中国石油天然气股份有限公司 Marmem pit shaft reproduces coiled tubing underseal refracturing method
CN109630083A (en) * 2018-11-22 2019-04-16 西南石油大学 A kind of abrasive perforating annular fracturing ground control system and method
CN110130867A (en) * 2019-04-16 2019-08-16 中国石油天然气股份有限公司 A kind of more cluster fracturing process of Slim Hole Sidetracking Technology horizontal well in segments

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