CN104153753B - Horizontal well volume fracturing tubular column and method based on conventional oil tube pressure dragging - Google Patents

Horizontal well volume fracturing tubular column and method based on conventional oil tube pressure dragging Download PDF

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Publication number
CN104153753B
CN104153753B CN201410423460.5A CN201410423460A CN104153753B CN 104153753 B CN104153753 B CN 104153753B CN 201410423460 A CN201410423460 A CN 201410423460A CN 104153753 B CN104153753 B CN 104153753B
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packer
pressure
construction
well head
tubing string
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CN104153753A (en
Inventor
孙虎
王祖文
隆世明
苏敏文
邓小强
邓继学
李尊团
宁治军
张文
许建伟
王建树
李景彬
安永江
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China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
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Changqing Downhole Operation Co of CNPC Chuanqing Drilling Engineering Co Ltd
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Abstract

The invention belongs to the technical field of ultra-low permeability reservoir reform, and particularly relates to a horizontal well volume fracturing tubular technological column and method based on conventional oil tube pressure dragging. The horizontal well volume fracturing tubular column and method are used for oil horizontal well volume fracturing technology. A conventional oil tube is adopted for conveying, a packer packs a constructed layer, hydraulic sand blasting perforation is carried out through hydraulic sand blasting, a ground annular preventer and a fracturing tree pressure dragging tubular column are combined to achieve oil and gas horizontal well continuous subsection volume fracturing construction, the problems that in an existing volume fracturing construction technological process, tubular column dragging operation can be carried out by releasing formation pressure, construction time is prolonged, and the constriction cost is increased are solved, construction time is shortened, construction efficiency is improved, and the construction cost is reduced.

Description

The horizontal well volume fracturing tubing string and fracturing process for dragging is pressed based on conventional oil pipe racks
Technical field
The invention belongs to super-low permeability reservoir renovation technique field, for oil well horizontal well volume fracturing technique, specifically relates to And a kind of horizontal well volume fracturing plumber's skill post dragged based on conventional oil pipe racks pressure and fracturing process.
Background technology
Along with the further exploitation in oil field, horizontal well volume fracturing process will as a kind of efficient reforming mode As the major alterations mode of extra-low-permeability reservoir.The characteristics of volume fracturing technology has big liquid measure, huge discharge, large sand amount, leans on Infusion does not reach design displacement requirements in oil pipe, needs in oil pipe and oil jacket annular space injects simultaneously.At present, some oilfield horizontal wells Volume fracturing construction it is a large amount of using " packer packing every construction layer, hydraulic jet perforation, oil jacket with noting, drag tubing string realize from Successively volume fracturing construction on down ", but apply man-hour requirement using the method just can be carried out by open flow release strata pressure Tubing string operation is dragged, extends the engineering time, increase construction cost.
The content of the invention
The purpose of the present invention is overcome in existing volume fracturing construction technological process, needs to be laminated with discharging by open flow Power just can carry out dragging tubing string operation, extend the engineering time, increase the problem of construction cost.
For this purpose, the invention provides a kind of press the horizontal well volume fracturing tubing string for dragging, including oil based on conventional oil pipe racks Pipe, being connected with turn on the horizontal segment of oil pipe can closing type hydrajet tool, pressure reduction control circulating valve, packer and guiding Centralizer, the hydrajet tool, pressure reduction control circulating valve, the connected mode between packer and righting-oriented device are silk Button connection.
Described hydrajet tool is can mechanically to close waterpower spray gun.
The packer is mechanical compression type packer.
The pressure reduction control circulating valve includes top connection, valve element and lower contact, and the head of lower contact is sleeved on top connection Afterbody is simultaneously fixed by stopping screw;
Valve element is located inside top connection and lower contact, and O-shaped sealing is provided between valve element and top connection, lower contact Circle;
The side wall of top connection and the side wall of valve element are worn and are connected to same shear pin, near shear pin on the side wall of top connection The bottom of nail offers through hole.
The pressure reduction controls circulating valve for normally close valve.
A kind of fracturing process of the horizontal well volume fracturing tubing string dragged based on conventional oil pipe racks pressure described above, including such as Lower step,
1)Bore under fastening means string:
Fracture well head installs successively from bottom to top well head big four, annular preventer;
Be sequentially connected tool string, from bottom to top for:Righting-oriented device+packer+pressure reduction control circulating valve+waterpower can be closed Spraycan;
After being drilled complete under tool string, the hanger of well head lower flange is connected with oil pipe;
2)Set:Transfer to design attitude after tool string, set packer, while hydrajet tool is opened;
3)Perforation:Load fluid is injected into oil pipe, load fluid is formed in the nozzle of hydrajet tool and takes sand jet at a high speed, Penetrate out sleeve pipe, cementing concrete ring and stratum;
4)Pressure break:Pressing crack construction is carried out to oil pipe and oil jacket annular space huge discharge injection fracturing fluid;
5)Deblocking packer with pressure:After pressing crack construction is finished, annular preventer, fracture well head and well head big four are closed All gates, lay down the connecting bolt between fracture well head and annular preventer, and tubing string is above carried together with fracture well head, solution Sealed packer, closes hydrajet tool;
6)Dragging tubing string with pressure:Fracture well head is laid down, adjustment tubing string is to next design and construction position;
7)Set again:After tubing string adjustment is finished, fracture well head is again connected on tubing string, then set packer, Hydrajet tool is opened, connects the connecting bolt between fracture well head and annular preventer, open annular preventer;
8)Repeat perforation, pressure break:Repeat step 3)、4)、5)、6)、7)Until all of construction location all pressure breaks are completed.Envelope Envelope failure is tested every device, is pulled out of hole and is changed tool string.
Above-mentioned step 7)After the completion of middle packer sets again, the infusion liquid into oil pipe, by measuring fluid pressure Complete that packer is carried out to test envelope operation, if testing seal about packer does not fail, continue next step construction operation, if testing seal about packer Failure, then need to pull out of hole to change and carry out construction operation again after tool string.
Above-mentioned step 3)The nozzle of middle hydrajet tool forms the chock pressure difference for taking sand jet at a high speed less than pressure reduction control The Opening pressure of circulating valve processed.
Beneficial effects of the present invention:This of the present invention presses the horizontal well volume fracturing plumber for dragging based on conventional oil pipe racks Skill post and fracturing process, using conventional tubing transmission, packer packing carries out hydraulic sand blasting and penetrates every construction layer by hydraulic sand blasting Hole, tie surface annular preventer combination fracturing tree belt pressure drags tubing string and realizes oil, gas well horizontal well contiguous segmentation volume fracturing Construction, shortens the engineering time, improves efficiency of construction, reduces construction cost.
The present invention is described in further details below with reference to accompanying drawing.
Description of the drawings
Fig. 1 is the tubular column structure schematic diagram of the present invention.
Fig. 2 is pressure reduction control circulating valve structure chart.
Description of reference numerals:1st, fracture well head;2nd, annular preventer;3rd, well head big four;4th, hydrajet tool;5th, press Difference control circulating valve;6th, packer;7th, righting-oriented device;8th, oil pipe;9th, oil jacket annular space;10th, top connection;11st, valve element;12nd, under Joint;13rd, stopping screw;14th, shear pin;15th, through hole.
Specific embodiment
So that in overcoming existing volume fracturing construction technological process, need to be carried out by open flow release strata pressure Tubing string operation is dragged, extends the engineering time, increase the problem of construction cost.Present embodiments provide a kind of based on conventional oil pipe racks The horizontal well volume fracturing tubing string that pressure is dragged, as shown in figure 1, including oil pipe 8, being connected with turn on the horizontal segment of oil pipe 8 can Closing type hydrajet tool 4, pressure reduction control circulating valve 5, packer 6 and righting-oriented device 7, the hydrajet tool 4, pressure Difference control circulating valve 5, the connected mode between packer 6 and righting-oriented device 7 are screwed connection, and hydrajet tool 4 is Waterpower spray gun can be mechanically closed, packer 6 is mechanical compression type packer.
Waterpower spray gun, mechanical compression type packer can be closed in the effect of oil field hydraulic jet perforation using very wide It is general, here its structure is not specially limited and is illustrated, expire by can routinely closing waterpower spray gun, mechanical compression type packer The requirement of sufficient this tool string.
The tubular column structure of this structure, will jointly drag when pressing crack construction with fracture well head 1, and in annular blowout prevention Use under the cooperation of device 2, realize dragging with pressure, it is to avoid open flow release strata pressure just can carry out dragging tubing string operation, save Time, reduce construction cost.
Pressure reduction control circulating valve 5 is normally close valve, as shown in Fig. 2 including top connection 10, valve element 11 and lower contact 12, under connect 12 head is sleeved on the afterbody of top connection 10 and is fixed by stopping screw 13;Valve element 11 is located at top connection 10 and lower contact Inside 12, and O-ring seal is provided between valve element 11 and top connection 10, lower contact 12;The side wall of top connection 10 and valve The side wall of core 11 is worn and is connected to same shear pin 14, and the bottom of close shear pin 14 offers logical on the side wall of top connection 10 Hole 15.
For pressure reduction controls circulating valve 5, it is mainly used in the packer 6 in work progress and fails, so that spray gun cannot be just Use when normally open abrasive perforating, be normally off when conventional, when tubing string internal pressure is higher than o exterior pressure, ginseng According to Fig. 2, internal high pressure produces downward hydraulic action to valve element 11, and this hydraulic action cuts off shear pin 14, valve element 11 Move down, the through hole 15 that now liquid inside and outside tubing string can pass through above top connection 10 is linked up, and then can realize tubing string Inside and outside circulation, safety pulls out of hole and changes drilling tool.
A kind of fracturing process of the horizontal well volume fracturing tubing string dragged based on conventional oil pipe racks pressure described above, including such as Lower step,
1)Bore under fastening means string:
Fracture well head 1 installs successively from bottom to top well head big four 3, annular preventer 2;
Be sequentially connected tool string, from bottom to top for:Righting-oriented device 7+ packer 6+ pressure reduction control circulating valve 5+ can be closed Hydrajet tool 4;
After being drilled complete under tool string, the hanger of well head lower flange is connected with oil pipe.
2)Set:Transfer to design attitude after tool string, by put-on and delegated tubing string, packer 6 selects here machine Tool compression packer, the slips anchoring of mechanical compression type packer applies certain the pressure of the drill compression packing on internal surface of sleeve pipe The packing element of device 6, set packer 6, tubing string while setting of packer 6 is subject to the compression stress of axial direction, hydrajet tool 4 (Selecting here can mechanically close waterpower spray gun)Compress in the effect of this axial compressive force, open nozzle fluid hole, tubing string It is inside and outside to be connected by the nozzle of hydrajet tool;
3)Perforation:The infusion load fluid into oil pipe 8, load fluid stream is formed in the nozzle of spray gun and takes sand jet at a high speed, is penetrated out Sleeve pipe, cementing concrete ring and stratum.During hydraulic jet perforation, liquid stream flows through the chock pressure difference produced during nozzle and is less than pressure reduction control The Opening pressure of circulating valve processed 5, now pressure differential cycles valve 5 go out liquid closed mode;
4)Pressure break:After perforation terminates, the infusion liquid into oil pipe 8 forces stratum crack initiation, after the crack initiation of stratum, into oil pipe 8 Pressing crack construction is carried out with the huge discharge of oil jacket annular space 9 injection fracturing fluid;
5)Deblocking packer with pressure:After pressing crack construction is finished, annular preventer 2, fracture well head 1 and well head are closed big by four Logical 3 all gates, lay down the connecting bolt between fracture well head 1 and annular preventer 2, by tubing string together with fracture well head 1 Above carry, deblocking packer 6, close hydrajet tool 4;It is now as follows with the well control state of oil jacket annular space in oil pipe:Annular is anti- The Seal Oil of spray apparatus 2 covers annular space 9, and can realize the dynamic sealing of oil jacket annular space 9.Derrick traveling system is together with tubing string in well Carry, now due to the connected pipes 8 of fracture well head 1, the fluid course in oil pipe 8 by the gate combined closing of fracture well head 2, now Liquid stream in tubing string will not flow out, when fracture well head 1 is above carried together with tubing string in well, what packer 6 applied when setting Tubing string axial compressive force disappears, while spray gun is re-closing off in the presence of reset itself spring, closes oil, set liquid stream and connects logical Road, now the liquid in oil jacket annular space 9 can not be into inside oil pipe 8.When above carrying to certain altitude(More than the deblocking of packer 6 Highly)When, packer 6 is unsealed, and transfers the flange face of well head to annular preventer 2, can now open the lock of fracture well head 1 Door, if loseing returns liquid in oil pipe, illustrates that down-hole mechanical can close spray gun and be turned off.Now can carry out unloading well head, it is with pressure Drag dynamic tubing string operation.
Due to conventional oil pipe rising, lower brill when tubing string have an action of decentralization, machinery can closing type spray gun unlatching compression Much larger than mechanical compression type packer and the frictional force of casing wall, when dynamic tubing string, waterpower spray gun will not be opened power.
6)Dragging tubing string with pressure:Well control risk is not had at the moment with oil jacket annular space 9 in oil pipe 8, can now carry out band Pressure drags tubing string operation, and adjustment tubing string is to next design and construction position;
7)Set again:After tubing string adjustment is finished, well mouth oil pipe 8 is again coupled to into fracture well head 1(The institute of fracture well head 1 There is closing gate), by put-on and delegated tubing string set packer 6, machinery can closing type spray gun while setting for packer 6 Open, connect the connecting bolt of fracture well head and annular preventer, open annular preventer 2;
8)Repeat perforation, pressure break:Repeat step 3)、4)、5)、6)、7)Until all of construction location all pressure breaks are completed.Envelope Envelope failure is tested every device, is pulled out of hole and is changed tool string.
Above-mentioned step 7)After the completion of middle packer 6 sets again, the infusion liquid into oil pipe 8, by measuring liquid pressure Power completes that packer 6 is carried out to test envelope operation, if testing seal about packer does not fail, continues next step construction operation, if packer Envelope failure is tested, is then needed to pull out of hole to be changed and carry out construction operation again after tool string.
In tool string, pressure reduction control circulating valve 5 is connected with, when the failure of mechanical compression type packer slip mechanism, that is, is managed When post is unable to grappling, now tubing string does not have the strong point as fulcrum to compress tubing string, so machinery can closing type spray gun cannot open Open, connectionless passage carries out open flow or circulation kill-job in oil pipe inside and outside tubing string, now lift pipe string has risk.Now suppress in oil pipe High pressure, starting differential pressure control circulating valve 5, is circulated open flow in kill-job or tubing string, pulls out of hole and changes drilling tool.
This fracturing string and fracturing process of the present invention, using conventional tubing transmission, packer packing leads to every construction layer Crossing hydraulic sand blasting carries out hydraulic jet perforation, and tie surface annular preventer combination fracturing tree belt pressure drags tubing string and realizes oil, gas Well water horizontal well contiguous segmentation volume fracturing is constructed, and is shortened the engineering time, is improved efficiency of construction, reduces construction cost.
Exemplified as above is only the illustration to the present invention, does not constitute the restriction to protection scope of the present invention, all It is that design same or analogous with the present invention is belonged within protection scope of the present invention.

Claims (1)

1. it is a kind of based on conventional oil pipe racks press drag horizontal well volume fracturing tubing string fracturing process, it is characterised in that:It is based on The horizontal well volume fracturing tubing string that conventional oil pipe racks pressure is dragged, including oil pipe(8), in oil pipe(8)Horizontal segment on be sequentially connected Having can closing type hydrajet tool(4), pressure reduction control circulating valve(5), packer(6)With righting-oriented device(7), the waterpower Spraycan(4), pressure reduction control circulating valve(5), packer(6)With righting-oriented device(7)Between connected mode be screw thread Connection;
Described hydrajet tool(4)Can mechanically to close waterpower spray gun, the packer(6)For mechanical compression type packing Device, the pressure reduction controls circulating valve(5)For normally close valve;
The pressure reduction controls circulating valve(5)Including top connection(10), valve element(11)And lower contact(12), lower contact(12)Head It is sleeved on top connection(10)Afterbody and pass through stopping screw(13)It is fixed;
Valve element(11)Positioned at top connection(10)And lower contact(12)Inside, and valve element(11)With top connection(10), lower contact (12)Between be provided with O-ring seal;Top connection(10)Side wall and valve element(11)Side wall wear and be connected to same shear pin Nail(14), top connection(10)Side wall near shear pin(14)Bottom offer through hole(15);
The method comprises the steps,
1)Bore under fastening means string:
Fracture well head(1)Well head big four is installed successively from bottom to top(3), annular preventer(2);
Be sequentially connected tool string, from bottom to top for:Righting-oriented device(7)+ packer(6)+ pressure reduction controls circulating valve(5)+ can close Close hydrajet tool(4);
After being drilled complete under tool string, the hanger of well head lower flange is connected with oil pipe;
2)Set:Set packer(6), while packer setting, hydrajet tool(4)In the compression force of tubing string Lower unlatching;
3)Perforation:To oil pipe(8)Interior injection load fluid, load fluid is in hydrajet tool(4)Nozzle formed and take sand at a high speed and penetrate Stream, penetrates out sleeve pipe, cementing concrete ring and stratum;
4)Pressure break:To oil pipe(8)With oil jacket annular space(9)Huge discharge injection fracturing fluid carries out pressing crack construction;
5)Deblocking packer with pressure:After pressing crack construction is finished, annular preventer is closed(2), fracture well head(1)It is big with well head by four It is logical(3)All gates, lay down fracture well head(1)With annular preventer(2)Between connecting bolt, by tubing string together with fracture well head (1)Above carry together, deblocking packer(6), close hydrajet tool(4);
6)Dragging tubing string with pressure:Lay down fracture well head(1), adjustment tubing string is to next design and construction position;
7)Set again:After tubing string adjustment is finished, by fracture well head(1)Again connect on tubing string, then set packer (6), open hydrajet tool(4), connect fracture well head(1)With annular preventer(2)Between connecting bolt, open annular Preventer(2);
8)Repeat perforation, pressure break:Repeat step 3)、4)、5)、6)、7)Until all of construction location all pressure breaks are completed;Packer Envelope failure is tested, is pulled out of hole and is changed tool string;
Described step 7)Middle packer(6)After the completion of setting again, to oil pipe(8)Interior infusion liquid, by measuring liquid pressure Power is completed to packer(6)Carry out testing envelope operation, if testing seal about packer does not fail, continue next step construction operation, if packing Device tests envelope failure, then need to pull out of hole to change and carry out construction operation again after tool string;
Described step 3)Middle hydrajet tool(4)Nozzle formed and take the chock pressure difference of sand jet less than pressure reduction control at a high speed Circulating valve(5)Opening pressure.
CN201410423460.5A 2014-08-26 2014-08-26 Horizontal well volume fracturing tubular column and method based on conventional oil tube pressure dragging Active CN104153753B (en)

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CN105178934A (en) * 2015-09-24 2015-12-23 中国石油天然气股份有限公司 Horizontal well no-throttle straddle-type double-sealing single-grip fracturing process
CN105525902B (en) * 2016-01-21 2019-01-22 中国石油化工股份有限公司 Fracturing process is returned on a kind of complete well water horizontal well of suspension screen casing
CN106014370A (en) * 2016-07-13 2016-10-12 北京龙恒业石油工程技术有限公司 Oil-pipe under-pressure dragging fracturing device and technology
CN106529074B (en) * 2016-11-28 2019-09-24 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 A kind of hydraulic sand blasting fixed point perforation mechanics parameter computation model and application method
CN111305787A (en) * 2018-12-11 2020-06-19 中国石油化工股份有限公司 Well completion method for carbonate reservoir ultra-deep horizontal well
CN113530512B (en) * 2020-04-22 2023-04-25 中国石油天然气股份有限公司 Fracturing string and fracturing method
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Patentee before: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING COMPANY LIMITED CHANGQING DOWNHOLE TECHNOLOGY Co.