CN102704904B - Multi-stage fracturing sliding sleeve device and using method thereof - Google Patents

Multi-stage fracturing sliding sleeve device and using method thereof Download PDF

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Publication number
CN102704904B
CN102704904B CN201210164217.7A CN201210164217A CN102704904B CN 102704904 B CN102704904 B CN 102704904B CN 201210164217 A CN201210164217 A CN 201210164217A CN 102704904 B CN102704904 B CN 102704904B
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CN
China
Prior art keywords
ball seat
sleeve
column joint
reducing ball
reducing
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CN201210164217.7A
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Chinese (zh)
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CN102704904A (en
Inventor
彭成勇
何保生
曹砚锋
孙东征
靳勇
张磊
文敏
田铮
潘豪
姜浒
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中国海洋石油总公司
中海油研究总院
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Priority to CN201210164217.7A priority Critical patent/CN102704904B/en
Publication of CN102704904A publication Critical patent/CN102704904A/en
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Publication of CN102704904B publication Critical patent/CN102704904B/en

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Abstract

The invention relates to a multi-stage fracturing sliding sleeve device and a using method thereof. The multi-stage fracturing sliding sleeve device is characterized by comprising an upper pipe column joint, a sleeve body, a lower pipe column joint, a switch sleeve and a reducing tee, wherein the lower part of the upper pipe column joint is connected with the upper part of the sleeve body; the lower part of the sleeve body is connected with the upper part of the lower pipe column joint; the sleeve body is in a circular barrel shape; a plurality of side holes are formed at the circumference near the upper position of the sleeve body at intervals; a circle of steps are formed at the inner side near to the lower position of the sleeve body; the switch sleeve which is also in a circular barrel shape is arranged in the sleeve body and below the upper pipe column joint and is fixed with the sleeve body through a plurality of pins; the inner diameter of the lower part of the switch sleeve is larger than that of the upper part of the switch sleeve; the reducing tee is arranged at the inner lower part of the switch sleeve; the circumference of the upper part of the reducing tee is fixedly connected with the switch sleeve through the plurality of pins; a plurality of cutting slits are formed at the lower part of the reducing tee; sealing mediums are filled in each cutting slit; the top of the lower pipe column joint is in a taper shape; a circle of steps bulging inwards are arranged at the bottom of the reducing tee, and the outer diameter of the top of the lower pipe column joint is smaller than that of the bottom of the reducing tee.

Description

A kind of multistage fracturing sliding bush apparatus and using method thereof

Technical field

The present invention relates to a kind of corollary apparatus and using method thereof of fracturing string, particularly about the multistage fracturing sliding bush apparatus on a kind of fracturing string exploiting shale gas reservoir/Sandstone Gas Reservoir and using method thereof.

Background technology

Conventional packer+sliding sleeve fracturing technology adopts throwing ball sealer, opens a sliding sleeve, completes one-level fracturing.The function of sliding sleeve not only needs to open and forms the circulation passage that fracturing fluid injects stratum, but also will coordinate with ball sealer and change fracturing fluid flow direction, and jointly realizes the fracturing work of formation with the packer pressure-bearing of its screens.Because ball sealer limits by fracturing string internal diameter, therefore, the fracturing sliding bush quantity that often can open of fracturing string is very limited.Along with the permeability of exploitation petroleum resources is more and more lower, need the progression of fracturing reform to get more and more, therefore, traditional fracturing sliding bush more and more can not meet the requirement of modern fracturing technique.

Summary of the invention

For the problems referred to above, the object of this invention is to provide a kind of multistage fracturing sliding bush apparatus and using method thereof, its ball sealer can normally also can pass through by open sliding sleeve smoothly, does not affect the unlatching of next stage sliding sleeve, can realize the object that throwing ball sealer opens multistage fracturing sliding sleeve.

For achieving the above object, the present invention takes following technical scheme: a kind of multistage fracturing sliding bush apparatus, is characterized in that: it comprises casing adapter, body, lower tubular column joint, switch sleeve and reducing ball seat; The bottom of described upper casing adapter connects the top of described body, and the bottom of described body connects the top of described lower tubular column joint; Described body is cylindrical shape, and its circumference near upper position is arranged at intervals with some side openings; Described body is provided with a circle step near the inner side of lower position; Described switch sleeve is also cylindrical, is arranged on the below of the inside of described body, described upper casing adapter, is connected and fixed with described body by some pins; The internal diameter of described switch sleeve bottom is greater than the internal diameter on its top, described reducing ball seat is arranged on the interior bottom of described switch sleeve, the top circumference of described reducing ball seat is connected and fixed by some pins and described switch sleeve, the bottom of described reducing ball seat is provided with some slots, is all filled with sealing medium in each described slot; The top of described lower tubular column joint is tapered, and the bottom of described reducing ball seat is provided with circle step protruding to the inside, and the external diameter at described lower tubular column joint top is less than the external diameter bottom described reducing ball seat.

All be threaded connection between described upper casing adapter, body, lower tubular column joint, and the setting of the upper and lower of described body is internal thread, what the bottom of described upper casing adapter and the top of described lower tubular column joint were arranged is external screw thread.

The top of described reducing ball seat is " C " ring structure, and bottom is provided with many slots, and the external diameter of the described minimum diameter of reducing ball seat and the ball sealer of its unlatching matches.

The junction of the junction of described upper casing adapter and described body, described body and the junction of described lower tubular column joint, described switch sleeve and described body, and the junction of described reducing ball seat and described switch sleeve is provided with sealing ring.

The using method of above-mentioned a kind of multistage fracturing sliding bush apparatus, it comprises the following steps: 1) fracturing string is divided into multistage, is provided with a fracturing sliding bush device between adjacent fracturing string; The top of upper tube column joint is connected in adjacent fracturing string, is positioned at the bottom of the fracturing string of top; The bottom of lower tube column joint is connected in adjacent fracturing string, is positioned at the top of the fracturing string of below; 2) throw ball sealer and be pumped to the step place of reducing ball seat; When lift pump is depressed into certain altitude, reducing ball seat is under the end thrust effect being subject to ball sealer, cut off by the pin be connected between switch sleeve with body, reducing ball seat and the downward axial slip of switch sleeve, the side opening that body is arranged near upper position circumference is opened gradually; When switch sleeve is displaced downwardly to lower contacts to the step of body inside, reducing ball seat and switch sleeve stop moving axially downwards; 3) improve pump pressure, after cutting off the pin be connected with switch sleeve under the end thrust effect that reducing ball seat bears at ball sealer, be rapidly to down and move axially; When the step of reducing ball seat touches the taper surface at lower tubular column joint top, reducing ball seat bottom is opened rapidly, and its internal diameter is expanded rapidly, ball sealer departs from reducing ball seat under end thrust effect, and through lower tubular column joint, achieve the unlatching of fracturing sliding bush, and pass through sliding sleeve smoothly; 4) ball sealer enters the step place of next reducing ball seat; Return step 2), repeat said process, realize the unlatching of multistage fracturing sliding sleeve.

The present invention is owing to taking above technical scheme, it has the following advantages: 1, upper casing adapter of the present invention connects body top, body bottom connects lower tubular column joint, arrange switch body in body, arrange reducing ball seat in switch body, the external diameter bottom reducing ball seat is greater than the taper surface at lower tubular column joint top, therefore, reducing ball seat is easy to open under the contact of taper surface, the shaft bottom and reducing ball seat does not fall, and impacts to construction in later period operation.2, switch body of the present invention is connected with body by pin, reducing ball seat is connected with switch body by pin, the bottom of reducing ball seat is provided with circle step protruding to the inside, when ball sealer is pumped to the step place of reducing ball seat, and lift pump is when being depressed into certain altitude, reducing ball seat is under the end thrust effect of ball sealer, the pin be connected between switch sleeve with body is cut off, reducing ball seat and the downward axial slip of switch sleeve, the side opening that body is arranged near upper position circumference is opened gradually; When switch sleeve is displaced downwardly to lower contacts to the step of body inside, reducing ball seat and switch sleeve stop moving axially downwards; Improve when being pumped to new high degree, after cutting off the pin be connected with switch sleeve under the end thrust effect that reducing ball seat bears at ball sealer, be rapidly to down and move axially; When reducing ball seat lower contacts is to the taper surface at lower tubular column joint top, reducing ball seat bottom is opened rapidly, its internal diameter is expanded rapidly, and ball sealer departs from reducing ball seat under end thrust effect, and through lower tubular column joint, achieve the unlatching of fracturing sliding bush, and have passed sliding sleeve smoothly, therefore, the present invention can not only normal open sliding sleeve, and can also ensure that ball sealer passes through smoothly, do not affect the unlatching of next stage sliding sleeve.3, the present invention is arranged between adjacent two sections of fracturing strings, and the top of upper tube column joint connects in adjacent fracturing string, is positioned at the bottom of the fracturing string of top; The bottom of lower tube column joint connects in adjacent fracturing string, is positioned at the top of the fracturing string of below, and therefore, can realize plural serial stage and normal unlatching, progression of connecting in theory is unrestricted.4, the present invention establishes fracturing fluid circulation passage by opening sliding sleeve, enables fracturing fluid in pipe pump into stratum, because this reducing gun perforation process.5, the multiple pressure break units in series of the present invention, last group pressure break unit adopts conventional fracturing sliding bush, namely form the fracturing string assembly that a pitching realizes multistage fracturing, adopt and repeatedly drop into different hole diameter ball sealer, easily can realize the multistage multiple cracking pressure break of straight well, horizontal well.Structure of the present invention is simple, and reliability is high, and cost is low, can be widely used in fracturing process.

Accompanying drawing explanation

Fig. 1 is that the present invention is main depending on partly cuing open structural representation

Fig. 2 is reducing ball socket structure schematic diagram of the present invention

Fig. 3 is reducing ball seat bottom of the present invention expanded configuration schematic diagram

Fig. 4 is that the present invention throws ball sealer unlatching schematic diagram

Fig. 5 is that ball sealer of the present invention passes through schematic diagram

Detailed description of the invention

Below in conjunction with drawings and Examples, the present invention is described in detail.

As shown in Figure 1, the present invention mainly comprises casing adapter 1, body 2, lower tubular column joint 3, switch sleeve 4 and reducing ball seat 5.

In the present invention, the bottom of casing adapter 1 is threaded connection the top of body 2, and the bottom of body 2 is threaded connection the top of lower tubular column joint 3.What the upper and lower of body 2 was arranged is internal thread, and what the bottom of upper casing adapter 1 and the top of lower tubular column joint 3 were arranged is external screw thread.Body 2 is cylindrical shape, and its circumference near upper position is arranged at intervals with some side openings 21; Body 2 is provided with a circle step 22 near the inner side of lower position.Switch sleeve 4 is also cylindrical, be arranged on the below of the inside of body 2, upper casing adapter 1, be connected and fixed by some pins 1 with body 2, the exterior circumferential of switch sleeve 4 is provided with a sealing ring 7, switch sleeve 4 realizes being tightly connected by sealing ring 7 and body 2, when the pin 1 on switch sleeve 4 is cut off, when switch sleeve 4 moves downward, step 22 place of bottom in body 2 can be stuck in; The internal diameter of switch sleeve 4 bottom is greater than the internal diameter on its top, reducing ball seat 5 is arranged on the interior bottom of switch sleeve 4, the top circumference of reducing ball seat 5 is connected and fixed with switch sleeve 4 by some pins 28, and the bottom of reducing ball seat 5 is provided with some slots 51, is full of sealing medium in slot 51.The top of lower tubular column joint 3 is tapered, the bottom of reducing ball seat 5 is provided with circle step 52 protruding to the inside, and the external diameter at lower tubular column joint 3 top is less than the external diameter bottom reducing ball seat 5, therefore, reducing ball seat 5 can be stuck in the taper surface place at lower tubular column joint 3 top by step 52 after falling.

As shown in Figure 2 and Figure 3, the top of reducing ball seat 5 of the present invention is " C " ring structure, and many slots 51 are arranged at bottom, and the quantity of slot 51 and length need to be optimized design according to the size of ball sealer.The great advantage of this structure is when reducing ball seat 5 is in switch sleeve 4, can carry out shutoff, can easily open after reducing ball seat 5 departs from switch sleeve 4, make ball sealer smoothly by reducing ball seat 5 to ball sealer.

In above-described embodiment, be increase sealing, the junction of upper casing adapter 1 and body 2, and body 2 all increases with the junction of lower tubular column joint 3 and is provided with sealing ring; Reducing ball seat 5 also increases with the junction of switch sleeve 4 and is provided with sealing ring.

In above-described embodiment, depart from and lock power in order to reduce reducing ball seat 5 in switch sleeve 2 process, reducing ball seat 5 external surface contacts with adopting certain angle inside switch sleeve 2.

In above-described embodiment, in order to realize successively, switch sleeve 4 departs from body 2, reducing ball seat 5 departs from switch sleeve 4, and the number, size etc. of pin 1 and pin 28 can be optimized design according to actual conditions.

In above-described embodiment, in order to ensure the expansion of reducing ball seat 5 bottom meet ball sealer 9 by requiring, in the tapering at lower tubular column joint 3 top, body 2, step 22 can be optimized according to actual conditions with the degree of depth of the distance at lower tubular column joint 3 top, the slot 51 of reducing ball seat 5 bottom.

The using method of fracturing sliding bush device of the present invention comprises the following steps:

1) fracturing string is divided into multistage, is provided with a set of fracturing sliding bush device of the present invention between adjacent fracturing string, and last group pressure break unit adopts conventional fracturing sliding bush; Concrete connection is: connected in adjacent fracturing string on the top of upper tube column joint 1 of the present invention, is positioned at the bottom of the fracturing string of top; The bottom of lower tube column joint 2 of the present invention is connected in adjacent fracturing string, is positioned at the top of the fracturing string of below.

2) as shown in Figure 4, throw ball sealer 9 and be pumped to step 52 place of reducing ball seat 5; When lift pump is depressed into certain altitude, reducing ball seat 5 is under the end thrust effect being subject to ball sealer 9, drive switch sleeve 4 to be cut off by pin 1 by pin 28, reducing ball seat 5 and switch sleeve 4 axial slip downwards, the side opening 21 that body 2 is arranged near upper position circumference is opened gradually.When switch sleeve 4 is displaced downwardly to lower contacts to the step 22 of body 2 inside, reducing ball seat 5 and switch sleeve 4 stop moving axially downwards.

3) as shown in Figure 5, improve when being pumped to new high degree (higher than first time pump pressure), after cutting off the pin 28 be connected with switch sleeve 4 under the end thrust effect that reducing ball seat 5 bears at ball sealer 9, be rapidly to down and move axially.When the step 52 of reducing ball seat 5 touches the taper surface at lower tubular column joint 3 top, reducing ball seat 5 bottom is opened rapidly, its internal diameter is expanded rapidly, ball sealer 9 departs from reducing ball seat 5 under end thrust effect, and through lower tubular column joint 3, achieve the unlatching of fracturing sliding bush, and have passed sliding sleeve smoothly.

4) ball sealer 9 enters step 52 place of the reducing ball seat 5 of lower a set of fracturing sliding bush device of the present invention; Return step 2), repeat said process, realize the unlatching of multistage fracturing sliding sleeve.

In above-described embodiment, the minimum diameter of reducing ball seat 5 need match with the external diameter of the ball sealer 9 of its unlatching; The present invention is also provided with plugging device, and selection and the final conventional fracturing sliding bush ball seat of plugging device external diameter match.

The various embodiments described above are only for illustration of the present invention, and wherein the structure, connected mode etc. of each parts all can change to some extent, and every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.

Claims (6)

1. a multistage fracturing sliding bush apparatus, is characterized in that: it comprises casing adapter, body, lower tubular column joint, switch sleeve and reducing ball seat;
The bottom of described upper casing adapter connects the top of described body, and the bottom of described body connects the top of described lower tubular column joint; Described body is cylindrical shape, and its circumference near upper position is arranged at intervals with some side openings; Described body is provided with a circle step near the inner side of lower position; Described switch sleeve is also cylindrical, is arranged on the below of the inside of described body, described upper casing adapter, is connected and fixed with described body by some pins; The internal diameter of described switch sleeve bottom is greater than the internal diameter on its top, described reducing ball seat is arranged on the interior bottom of described switch sleeve, the top circumference of described reducing ball seat is connected and fixed by some pins and described switch sleeve, the bottom of described reducing ball seat is provided with some slots, is all filled with sealing medium in each described slot; The top of described lower tubular column joint is tapered, and the bottom of described reducing ball seat is provided with circle step protruding to the inside, and the external diameter at described lower tubular column joint top is less than the external diameter bottom described reducing ball seat.
2. a kind of multistage fracturing sliding bush apparatus as claimed in claim 1, it is characterized in that: be all threaded connection between described upper casing adapter, body, lower tubular column joint, and the setting of the upper and lower of described body is internal thread, what the bottom of described upper casing adapter and the top of described lower tubular column joint were arranged is external screw thread.
3. a kind of multistage fracturing sliding bush apparatus as claimed in claim 1, is characterized in that: the top of described reducing ball seat is " C " ring structure, and bottom is provided with many slots, and the external diameter of the described minimum diameter of reducing ball seat and the ball sealer of its unlatching matches.
4. a kind of multistage fracturing sliding bush apparatus as claimed in claim 2, is characterized in that: the top of described reducing ball seat is " C " ring structure, and bottom is provided with many slots, and the external diameter of the described minimum diameter of reducing ball seat and the ball sealer of its unlatching matches.
5. a kind of multistage fracturing sliding bush apparatus as claimed in claim 1 or 2 or 3 or 4, it is characterized in that: the junction of the junction of described upper casing adapter and described body, described body and the junction of described lower tubular column joint, described switch sleeve and described body, and the junction of described reducing ball seat and described switch sleeve is provided with sealing ring.
6. the using method of multistage fracturing sliding bush apparatus as described in any one of Claims 1 to 5, it comprises the following steps:
1) fracturing string is divided into multistage, is provided with a fracturing sliding bush device between adjacent fracturing string; The top of upper tube column joint is connected in adjacent fracturing string, is positioned at the bottom of the fracturing string of top; The bottom of lower tube column joint is connected in adjacent fracturing string, is positioned at the top of the fracturing string of below;
2) throw ball sealer and be pumped to the step place of reducing ball seat; When lift pump is depressed into certain altitude, reducing ball seat is under the end thrust effect being subject to ball sealer, cut off by the pin be connected between switch sleeve with body, reducing ball seat and the downward axial slip of switch sleeve, the side opening that body is arranged near upper position circumference is opened gradually; When switch sleeve is displaced downwardly to lower contacts to the step of body inside, reducing ball seat and switch sleeve stop moving axially downwards;
3) improve pump pressure, after cutting off the pin be connected with switch sleeve under the end thrust effect that reducing ball seat bears at ball sealer, be rapidly to down and move axially; When the step of reducing ball seat touches the taper surface at lower tubular column joint top, reducing ball seat bottom is opened rapidly, and its internal diameter is expanded rapidly, ball sealer departs from reducing ball seat under end thrust effect, and through lower tubular column joint, achieve the unlatching of fracturing sliding bush, and pass through sliding sleeve smoothly;
4) ball sealer enters the step place of next reducing ball seat; Return step 2), repeat said process, realize the unlatching of multistage fracturing sliding sleeve.
CN201210164217.7A 2012-05-24 2012-05-24 Multi-stage fracturing sliding sleeve device and using method thereof CN102704904B (en)

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CN103806888B (en) * 2012-11-12 2016-05-11 中国石油天然气股份有限公司 Down-hole infinite series control fracturing sliding bush
CN103899288B (en) * 2012-12-25 2016-07-06 中国石油化工股份有限公司 Fracturing sliding bush assembly
CN103334733A (en) * 2013-07-18 2013-10-02 中国石油集团长城钻探工程有限公司 Sliding sleeve for fast fracturing
CN103628853A (en) * 2013-11-06 2014-03-12 宝鸡瑞林石油机电设备有限责任公司 Ball jumping type sliding sleeve device used under well
CN104234683B (en) * 2014-09-12 2017-03-15 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 diameter changing mechanism
CN104847325B (en) * 2015-05-15 2017-11-10 中国海洋石油总公司 It is a kind of mechanically or hydraulically to trigger infinite stages segmentation transformation sliding bush apparatus
CN108204229B (en) * 2016-12-20 2020-06-09 中国石油天然气股份有限公司 Barrel-clamping type ball-throwing fracturing sliding sleeve
CN108729895B (en) * 2017-04-18 2020-10-09 中国石油天然气股份有限公司 Multistage fracturing tool of sleeve pipe ball seat
CN107035352B (en) * 2017-06-08 2019-01-25 中国石油大学(北京) A kind of water-jet infinite stages fracturing device and fracturing process

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CN201908623U (en) * 2010-12-17 2011-07-27 中国石油集团长城钻探工程有限公司 Ball injection opening self-locking sliding sleeve
CN202152674U (en) * 2011-06-23 2012-02-29 中国石油天然气股份有限公司 Drillable ball throwing sliding sleeve for fracturing and acidizing horizontal well in segmented way
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No.

Co-patentee after: CNOOC research institute limited liability company

Patentee after: China Offshore Oil Group Co., Ltd.

Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No.

Co-patentee before: CNOOC Research Institute

Patentee before: China National Offshore Oil Corporation