CN103470239B - A kind of continuous fracturing technology method of dragging with pressure - Google Patents

A kind of continuous fracturing technology method of dragging with pressure Download PDF

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Publication number
CN103470239B
CN103470239B CN201310363613.7A CN201310363613A CN103470239B CN 103470239 B CN103470239 B CN 103470239B CN 201310363613 A CN201310363613 A CN 201310363613A CN 103470239 B CN103470239 B CN 103470239B
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pressure
construction
pressing crack
way
dragging
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CN103470239A (en
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孙虎
邓继学
徐迎新
谢涛
韩静静
高红平
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CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING Co.
China National Petroleum Corp
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Changqing Downhole Operation Co of CNPC Chuanqing Drilling Engineering Co Ltd
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Abstract

The present invention relates to exploration of oil and gas field and development technique field, is a kind of new technology improving reservoir reconstruction efficiency, is a kind of continuous fracturing technology method of dragging with pressure.Its equipment at least comprises the little four-way of pressure break, annular jet discharging device, flashboard jet discharging device and well head four-way, it is characterized in that: the continuous fracturing technology method of this dragging with pressure is installed according to equipment, the pressure release of the pressing crack construction of the first construction interval, the first construction interval, Seal Oil cover annular space carries the pressing crack construction five steps dragging tubing string and subsequent construction interval carries out.The method adopts the combination of well head annular preventer and ram preventer, simultaneously optimization tool string, makes without the need to open flow, backwash in pressing crack construction and adjustment drilling tool process, band adjustment drilling tool, average single hop saving 3 to 5 hours used times of construction.

Description

A kind of continuous fracturing technology method of dragging with pressure
Technical field
The present invention relates to exploration of oil and gas field and development technique field, is a kind of new technology improving reservoir reconstruction efficiency, is a kind of continuous fracturing technology method of dragging with pressure.
Background technology
Current long celebrating region oil well horizontal well segmentation reforming mode has bridging plug packing pressure break, packer packing every modes such as pressure break, the packing of sand plug and liquid gum plug packings, based on packer staged fracturing technology.Although multi-stage water power injection packing pressure break can realize one-trip string and construct about 10 sections, must carry out the operations such as open flow step-down, backwash before dragging, occupy a large amount of engineering times, be not optimum reservoir High Efficiency Reform means.
Summary of the invention
The object of the invention is the limitation for horizontal well reforming technology, adopt the combination of well head annular preventer and ram preventer, simultaneously optimization tool string, make in pressing crack construction and adjustment drilling tool process without the need to open flow, backwash, band adjustment drilling tool, average single hop saving 3 to 5 hours used times of construction.
Technical scheme of the present invention is a kind of continuous fracturing technology method of dragging with pressure, its equipment at least comprises the little four-way of pressure break, annular jet discharging device, flashboard jet discharging device and well head four-way, it is characterized in that: this dragging with pressure continuous fracturing technology method is carried out according to following step:
Step 1, equipment is installed; First, install well head four-way at construction well head, and install ram preventer and annular preventer successively on well head four-way, the little four-way of pressure break is fixed on annular preventer;
Secondly, by guiding plug, packer, can repeat switch formula waterpower airbrush tool and reverse circulation valve successively by screwed connection below the oil pipe of construction well head; Oil pipe and the little four-way of pressure break are by screwed connection, and the little four-way of pressure break is fixedly installed on annular preventer;
Then, oil pipe is transferred in pipe box, and make can repeat switch formula waterpower airbrush tool to the first fractured layer;
Step 2, the pressing crack construction of the first construction interval; When can after repeat switch formula waterpower airbrush tool aims at the first fractured layer, according to the requirement of pressing crack construction and program, pressing crack construction is carried out to the first interval, by infusion highly pressurised liquid in well, make automatically to open under hydraulic action by repeat switch formula waterpower airbrush tool, the packing element of packer expands and sets under the effect of hydraulic coupling, and liquid flows through spray gun nozzle and carries out injection pressure break to the first fractured layer;
Step 3, the pressure release of the first construction interval; After first construction interval pressing crack construction completes, close ram preventer, open the side gate valve of the little four-way of pressure break, pressure in release oil pipe, can the hydraulic pressure of repeat switch formula waterpower airbrush tool reduce automatically to close, the packing element of packer automatically shrinks under the effect of its own resilient, and pressure leak process is until terminate when confirming that well head pressure is zero, the then little four-way of overall pulling down pressure break;
Step 4, Seal Oil cover annular space carries dragging tubing string; Close annular preventer, open ram preventer, above carry dragging oil pipe and make to aim at next fractured layer place by repeat switch formula waterpower airbrush tool;
Step 5, the pressing crack construction of subsequent construction interval; After the pressing crack construction of the first fractured layer and pressure release all complete, can repeat switch formula waterpower airbrush tool by oil pipe being carried to follow-up fractured layer, repeat step 2 to the process of step 4, pressing crack construction is carried out to follow-up construction interval, until all interval pressing crack constructions complete;
Every 2 to 3 construction intervals pressing crack construction terminate after, need to check tubing string depending on lance ejection pressure; If pressure is normal, then continues to drag tubing string and carry out pressing crack construction; If pressure is on the low side, pitching should open reverse circulation valve, open flow, to recoil to Jing Nei returning fluid body without sand, and pull out of hole and change tubing string.
Described annular preventer and the sealing load of ram preventer are not less than 35MPa.
Feature of the present invention adopts annular jet discharging device and flashboard jet discharging device as wellhead equipment, and by the little four-way of pressure break and oil pipe UNICOM, realize the pressure release of oil pipe inside; Adopt guiding plug, packer, repeat switch formula waterpower airbrush tool and reverse circulation valve and oil pipe thread can connect and compose tool string, by can open or close oil pipe passage, annular preventer shutoff annular space by repeat switch formula waterpower airbrush tool, to realize after pressure in well when not pressure release, dragging tubing string with pressure, realize the continuous fracturing technology of dragging with pressure of not pressure release after pressing, transform means more efficiently for horizontal well multistage pressure break provides.
Accompanying drawing explanation
Below in conjunction with specific embodiment, the present invention is further illustrated:
Fig. 1 is the device structure schematic diagram of the continuous fracturing technology method of dragging with pressure.
In figure: 1, the little four-way of pressure break; 2, annular preventer; 3, ram preventer; 4, well head four-way; 5, pipe box; 6, oil pipe; 7, reverse circulation valve; 8, can repeat switch formula waterpower airbrush tool; 9, packer; 10, lead plug wire; 11, the first fractured layer.
Detailed description of the invention
As shown in Figure 1, a kind of continuous fracturing technology method of dragging with pressure, the tool string that the equipment that it adopts is divided into wellhead equipment and goes into the well.
Wellhead equipment has the little four-way 1 of pressure break, annular preventer 2, ram preventer 3 and well head four-way, tool string comprise reverse circulation valve 7, can repeat switch formula waterpower airbrush tool 8, packer 9 and guiding plug wire 10.
Wherein, the sealing load of annular preventer 2 and ram preventer 3 is not less than 35MPa.
This dragging with pressure continuous fracturing technology method is carried out according to following step:
Step 1, as shown in Figure 1, equipment is installed; First, at construction well head, well head four-way 4 is installed, and ram preventer 3 and annular preventer 2 are installed successively on well head four-way 4;
Secondly, by guiding plug 10, packer 9, can repeat switch formula waterpower airbrush tool 8 and reverse circulation valve 7 successively by screwed connection below the oil pipe 6 of construction well head, they constitute tool string of going into the well; Oil pipe 6 and the little four-way 1 of pressure break are by screwed connection, and the little four-way 1 of pressure break is fixedly installed on annular preventer 2;
Then, oil pipe 6 is transferred in pipe box 5, and make can repeat switch formula waterpower airbrush tool 8 to the first fractured layer 11.
Step 2, the pressing crack construction of the first construction interval; When can after repeat switch formula waterpower airbrush tool 8 aims at the first fractured layer 11, according to the requirement of pressing crack construction and program, pressing crack construction be carried out to the first interval.
In the process of pressing crack construction, by infusion highly pressurised liquid in well, make automatically to open under hydraulic action by repeat switch formula waterpower airbrush tool 8, the packing element of packer 9 expands and sets under the effect of hydraulic coupling, and liquid flows through spray gun nozzle and carries out injection pressure break to the first fractured layer 11.
Step 3, the pressure release of the first construction interval; After first construction interval pressing crack construction completes, close ram preventer 3, open the side gate valve of the little four-way 1 of pressure break, the pressure in release oil pipe 6.
At this moment, can the hydraulic pressure of repeat switch formula waterpower airbrush tool 8 reduce automatically to close, the packing element of packer 9 automatically shrinks under the effect of its own resilient, completes pressure release.
Pressure leak process continues to carry out, until terminate when confirming that well head pressure is zero, the then little four-way 1 of overall pulling down pressure break.
Step 4, Seal Oil cover annular space carries dragging tubing string; Close annular preventer 2, open ram preventer 3, above carry dragging oil pipe 6 and make to aim at next fractured layer place by repeat switch formula waterpower airbrush tool 8.
Step 5, the pressing crack construction of subsequent construction interval; After the pressing crack construction of the first fractured layer 11 and pressure release all complete, can repeat switch formula waterpower airbrush tool 8 by oil pipe 6 being carried to follow-up fractured layer, repeat step 2 to the process of step 4, pressing crack construction is carried out to follow-up construction interval, until all interval pressing crack constructions complete.
When successively carrying out pressing crack construction to each construction interval, after often completing the pressing crack construction of 2 to 3 construction intervals, need to check tubing string 6 according to lance ejection pressure; Now, if pressure is normal, then continues to drag tubing string and carry out pressing crack construction; If pressure is on the low side, pitching should open reverse circulation valve 7, open flow, to recoil to Jing Nei returning fluid body without sand, and pull out of hole and change tubing string.
Wherein, injection pressing crack construction and the pressure release of construction interval are constructed, and namely the specific operation process of step 2 and step 3 is all the technological means often adopted in this area, is not here described in detail.
Tool string is transferred to construction interval by oil pipe 6 by the method, utilization can automatically open or close by repeat switch formula waterpower airbrush tool 8 under the effect of hydraulic pressure, the packing element of packer 9 carries out expanding or regaining under the effect of natural resiliency, and by closing annular preventer 2 shutoff oil jacket annular space, dragging oil pipe 6 with pressure realizes dragging separate stratum fracfturing with pressure with tool string to next target zone, average single hop saving 3 to 5 hours used times of construction.
The parts that the present embodiment does not describe in detail and structure belong to the well-known components of the industry and common structure or conventional means, do not describe one by one here.

Claims (2)

1. the continuous fracturing technology method of dragging with pressure, its equipment at least comprises the little four-way of pressure break (1), annular jet discharging device (2), flashboard jet discharging device (3) and well head four-way (4), it is characterized in that: this dragging with pressure continuous fracturing technology method is carried out according to following step:
Step 1, equipment is installed; First, install well head four-way (4) at construction well head, and on well head four-way (4), install ram preventer (3) and annular preventer (2) successively, the little four-way of pressure break (1) is fixed on annular preventer (2);
Secondly, the plug (10) that will lead, packer (9), can repeat switch formula waterpower airbrush tool (8) and reverse circulation valve (7) successively by screwed connection below the oil pipe (6) of well head of constructing; Oil pipe (6) and the little four-way of pressure break (1) are by screwed connection, and the little four-way of pressure break (1) is fixedly installed on annular preventer (2);
Then, oil pipe (6) is transferred in pipe box (5), and make can repeat switch formula waterpower airbrush tool (8) to the first fractured layer (11);
Step 2, the pressing crack construction of the first construction interval; When can after repeat switch formula waterpower airbrush tool (8) aims at the first fractured layer (11), according to the requirement of pressing crack construction and program, pressing crack construction is carried out to the first interval, by infusion highly pressurised liquid in well, make repeat switch formula waterpower airbrush tool (8) automatically to open under hydraulic action, the packing element of packer (9) expands and sets under the effect of hydraulic coupling, and liquid flows through spray gun nozzle and carries out injection pressure break to the first fractured layer (11);
Step 3, the pressure release of the first construction interval; After first construction interval pressing crack construction completes, close ram preventer (3), open the side gate valve of the little four-way of pressure break (1), pressure in release oil pipe (6), can the hydraulic pressure of repeat switch formula waterpower airbrush tool (8) reduce automatically to close, the packing element of packer (9) automatically shrinks under the effect of its own resilient, and pressure leak process is until terminate when confirming that well head pressure is zero, the then little four-way of overall pulling down pressure break (1);
Step 4, Seal Oil cover annular space carries dragging tubing string; Close annular preventer (2), open ram preventer (3), above propose dragging oil pipe (6) and make repeat switch formula waterpower airbrush tool (8) next fractured layer place to be aimed at;
Step 5, the pressing crack construction of subsequent construction interval; After the pressing crack construction of the first fractured layer (11) and pressure release all complete, can repeat switch formula waterpower airbrush tool (8) carry to follow-up fractured layer by oil pipe (6), repeat step 2 to the process of step 4, pressing crack construction is carried out to follow-up construction interval, until all interval pressing crack constructions complete;
Every 2 to 3 construction intervals pressing crack construction terminate after, need to check tubing string depending on lance ejection pressure; If pressure is normal, then continues to drag tubing string and carry out pressing crack construction; If pressure is on the low side, pitching should open reverse circulation valve (7), open flow, to recoil to Jing Nei returning fluid body without sand, and pull out of hole and change tubing string.
2. according to the continuous fracturing technology method of the dragging with pressure of the one described in claim 1, it is characterized in that: described annular preventer (2) and the sealing load of ram preventer (3) are not less than 35MPa.
CN201310363613.7A 2013-08-20 2013-08-20 A kind of continuous fracturing technology method of dragging with pressure Active CN103470239B (en)

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CN105089553B (en) * 2014-05-14 2018-01-02 中国石油天然气股份有限公司 Oilfield horizontal well multistage fracturing reform service valve with pressure and anti-flushing well releasing method
CN104153753B (en) * 2014-08-26 2017-04-19 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
CN104196492B (en) * 2014-08-26 2016-08-17 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 dragging down-hole plugging valve with pressure
CN107939376A (en) * 2017-11-27 2018-04-20 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 gas well gas testing operation integrated synthesis completion 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

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CN102704884A (en) * 2011-03-28 2012-10-03 盐城市阳标石油机械有限公司 Intelligentized multi-functional well head device
CN202659221U (en) * 2012-06-07 2013-01-09 中国石油化工股份有限公司 Horizontal well fracturing string

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US3498393A (en) * 1967-09-26 1970-03-03 W & H Production Drilling Inc Well control method
CN2825929Y (en) * 2005-08-27 2006-10-11 辽河石油勘探局 Wellhead device for oil-water well fracturing construction
CN102704884A (en) * 2011-03-28 2012-10-03 盐城市阳标石油机械有限公司 Intelligentized multi-functional well head device
CN202659221U (en) * 2012-06-07 2013-01-09 中国石油化工股份有限公司 Horizontal well fracturing string

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Effective date of registration: 20211020

Address after: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen

Patentee after: CHINA NATIONAL PETROLEUM Corp.

Patentee after: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING Co.

Address before: 710018 room 1207, Changqing building, Changqing Xing Long Yuan District, Xi'an, Shaanxi

Patentee before: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING COMPANY LIMITED CHANGQING DOWNHOLE TECHNOLOGY Co.

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