CN105756647A - Hydraulic jet fracturing method adopting multi-stage and multi-cluster string fracturing and utilizing immobile strings - Google Patents
Hydraulic jet fracturing method adopting multi-stage and multi-cluster string fracturing and utilizing immobile strings Download PDFInfo
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- CN105756647A CN105756647A CN201410788821.6A CN201410788821A CN105756647A CN 105756647 A CN105756647 A CN 105756647A CN 201410788821 A CN201410788821 A CN 201410788821A CN 105756647 A CN105756647 A CN 105756647A
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Abstract
The invention provides a hydraulic jet fracturing method adopting multi-stage and multi-cluster string fracturing and utilizing immobile strings. The method comprises steps as follows: first-layer fracturing operation is performed; layer-exchange fracturing operation is performed, and when the layer-exchange fracturing operation is performed, multiple sliding sleeves are opened through increase of displacement after ball injection is performed on the immobile strings. The multiple sliding sleeves are opened through increase of displacement after ball injection is performed on the immobile strings, treated intervals are multiplied, and the need of staged fracturing transformation operation of a well with multiple operation sections and a long horizontal section is met.
Description
Technical field
The present invention relates to fracturing unit field, more particularly, to the fracturing process of a kind of multistage many bunches of fracturing strings of fixed tubular column water-jet.
Background technology
Hydraulic jetting fracturing refers to and utilizes ground high-pressure pump group, high-viscous liquid (fracturing fluid) is pumped in well by the discharge capacity to exceed formation absorption ability, and high pressure has been suppressed in shaft bottom, after this pressure overcomes Around A Borehole crustal stress to reach tensile strength of rock, just produce one or several horizontally or vertically crack in shaft bottom.Continuing the load fluid with proppant is injected fracturing fluid, crack continues to extend and filling proppant in crack.After termination of pumping, due to the supporting role of proppant fracture, the sand packed fracture with certain physical dimension and flow conductivity can be formed in the earth formation.
Hydraulic jetting fracturing technology is one of effective technology means of horizontal well transformation, it may be achieved fixed tubular column perforation, pressure break, isolation institutional operation, the advantage such as have short construction period, safety is high, to make seam position accurate, in each oil field wide popularization and application.Due to the restriction by casing inner diameter, the interval number of fixed tubular column single treatment is at about 10 sections, it is impossible to meet that operation hop count is many, the transformation of the staged fracturing of the well of long horizontal sections.
Summary of the invention
It is desirable to provide the fracturing process of a kind of multistage many bunches of fracturing strings of fixed tubular column water-jet, to solve of the prior art to meet that operation hop count is many, the problem of the staged fracturing of the well of long horizontal sections.
To achieve these goals, the invention provides the fracturing process of a kind of multistage many bunches of fracturing strings of fixed tubular column water-jet, including: ground floor fracturing work；Change a layer fracturing work, when changing layer fracturing work, after fixed tubular column pitching, realize opening multiple sliding sleeve by improving discharge capacity.
Further, ground floor fracturing work includes preparing before equipment is gone into the well.
Further, equipment prepares to include before going into the well: sand washing, well-flushing, drifting and scrape wall.
Further, equipment prepares to include before going into the well: be sequentially connected with guide head, screen casing, ball-and-seat, the multistage many bunches of spray guns of one-level, the first centralizer, sleeve base, two grades of multistage many bunches of spray guns and the second centralizer to form pipe string.
Further, after the equipment of completing prepares before going into the well, with standby pressuring oil pipe by pipe string lower going-into-well, then pipe nipple seat well head deeply and is joined in school.
Further, by after in pipe string lower going-into-well, low discharge capacity direct flushing, wash logical after pitching.
Further, after pitching, improve pressure and the discharge capacity of oil pipe, add sand when rising to design load and start perforation.
Further, carrying out oil jacket mixed water injection after completing perforation, rise to and start fracturing work after preset pressure value, fracturing work includes: beats prepad fluid, add sand, beat displacement fluid again after complete design sand feeding amount.
Application technical scheme, after fixed tubular column pitching, realizes opening multiple sliding sleeve by improving discharge capacity, it is achieved process interval and become the increase of multiple, meets that operation hop count is many, the staged fracturing transformation operation needs of the well of long horizontal sections.
Accompanying drawing explanation
The Figure of description constituting the part of the application is used for providing a further understanding of the present invention, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 illustrates the structural representation of the fixed tubular column hydraulic jetting fracturing device of the embodiment of the present invention.
Accompanying drawing labelling: 1, guide head；2, screen casing；3, ball-and-seat；4, the multistage many bunches of spray guns of one-level；5, the first centralizer；6, sleeve base；7, two grades of multistage many bunches of spray guns；8, the second centralizer.
Detailed description of the invention
It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
The embodiment provides a kind of multistage many bunches of fracturing string fracturing process of fixed tubular column water-jet to include: ground floor fracturing work, change a layer fracturing work, when changing layer fracturing work, after fixed tubular column pitching, realize opening multiple sliding sleeve by improving of the fracturing fluid flow.
In the present embodiment, for the problem that fixed tubular column hydraulic jetting fracturing technical finesse interval is few, when changing layer fracturing work, after fixed tubular column pitching, realize opening multiple sliding sleeve by improving discharge capacity, realization processes interval and becomes the increase of multiple, meets that operation hop count is many, the staged fracturing transformation operation needs of the well of long horizontal sections.Secondly, multistage many bunches of fracturing string techniques can realize multiple spot and spray fracturing reform simultaneously, are the effective string technology means realizing hyposmosis compact oil reservoir seam net fracturing reform.3rd, multistage many bunches of fracturing string techniques can optimizing pore arrangement mode, improve oil flow channel, the transformation of old well multistage, substratum is more abundant, and effect of increasing production becomes apparent from.
Preferably, ground floor fracturing work includes preparing before equipment is gone into the well.Equipment prepares to include before going into the well: sand washing, well-flushing, drifting and scrape wall.
Preferably, equipment prepares to include before going into the well: be sequentially connected with guide head 1, screen casing 2, ball-and-seat 3, one-level multistage many bunches of spray guns the 4, first centralizer 5, the multistage many bunches of spray guns 7 of sleeve base 6, two grades and the second centralizer 8 to form pipe string.Pipe string forms the fracturing device for operation.The structural representation of the fixed tubular column hydraulic jetting fracturing device of Fig. 1 embodiment of the present invention.
Preferably, after the equipment of completing prepares before going into the well, with standby pressuring oil pipe by pipe string lower going-into-well, then school deep (accurately measuring the degree of depth in pipe string lower going-into-well) join pipe nipple (connecting short section is to adjust the degree of depth of pipe string to preset value) and sit well head (by pipe string and fix in well head).
Preferably, by after in pipe string lower going-into-well, low discharge capacity direct flushing, wash logical after pitching.
Preferably, after pitching, improve pressure and the discharge capacity of oil pipe, add sand when rising to design load and start perforation.
Preferably, after completing perforation, again improving pressure and the discharge capacity of oil pipe, sleeve pipe also begins to fluid injection simultaneously, starts fracturing work after rising to design load, and fracturing work includes: beats prepad fluid, add sand, beat displacement fluid again after complete design sand feeding amount.
Specifically comprising the following steps that of the present embodiment
1. sand washing, well-flushing；
2. drifting, scrape wall；
3. qualified each parts will be checked to be sequentially connected with in the following order:
Guide head+screen casing+ball-and-seat+multistage many bunches of spray gun+centralizers of one-level many bunches spray gun+centralizer+sleeve base+two grades.
(note: the spacing of many bunches of spray guns of I and II is determined by the concrete condition of oil reservoir, the number of every grade of spray gun is also determined by the concrete condition of oil reservoir, it is possible to be 1,2,3 etc.)
4. with standby pressuring oil pipe by pipe string lower going-into-well, school is deep, joins pipe nipple and sits well head；
5. surface line even good rear pressure testing is qualified, sits tree protector；
6. low discharge capacity direct flushing, washes logical rear pitching；
7. improve pressure and the discharge capacity of oil pipe, add sand when rising to design load and start perforation.Keep pressure, discharge capacity to stop adding sand after completing perforation with sand than certain time, reduce pressure and discharge capacity, close sleeve pipe；
8. again improving pressure and the discharge capacity of oil pipe, sleeve pipe also begins to fluid injection simultaneously, starts fracturing work, after having beaten prepad fluid, start to add sand, beat displacement fluid again, complete the fracturing work of ground floor after complete design sand feeding amount after rising to design load.
9. when changing layer operation:
Fixed tubular column, treat that casing pressure slowly opens sleeve gate (must have gate control on sleeve pipe relief line) after dropping to certain value, throw a ball and realize opening multiple (two or three) sliding sleeve by being respectively increased the mode of discharge capacity, repeat above step 7,8.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
Achieve fixed tubular column water-jet to process interval and become the increase of multiple, meet that operation hop count is many, the staged fracturing transformation operation needs of the well of long horizontal sections, expand the application of this technology, compensate for the deficiency of original technology.Secondly, stitch net fracturing reform for hyposmosis compact oil reservoir and provide a kind of effective string technology means.3rd, multistage many bunches of fracturing string techniques can optimizing pore arrangement mode, improve oil flow channel, monolayer sand feeding amount can be properly increased, the transformation of old well multistage, substratum is more abundant, and effect of increasing production becomes apparent from.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (8)
1. the fracturing process of the multistage many bunches of fracturing strings of fixed tubular column water-jet, it is characterised in that including:
Ground floor fracturing work；
Change a layer fracturing work, described change layer fracturing work time, after fixed tubular column pitching, realize opening multiple sliding sleeve by improving discharge capacity.
2. the fracturing process of the multistage many bunches of fracturing strings of fixed tubular column water-jet according to claim 1, it is characterised in that described ground floor fracturing work includes preparing before equipment is gone into the well.
3. the fracturing process of the multistage many bunches of fracturing strings of fixed tubular column water-jet according to claim 2, it is characterised in that described equipment prepares to include before going into the well: sand washing, well-flushing, drifting and scrape wall.
4. the fracturing process of the multistage many bunches of fracturing strings of fixed tubular column water-jet according to claim 2, it is characterized in that, described equipment prepares to include before going into the well: be sequentially connected with guide head (1), screen casing (2), ball-and-seat (3), the multistage many bunches of spray guns of one-level (4), the first centralizer (5), sleeve base (6), two grades of multistage many bunches of spray guns (7) and the second centralizer (8) to form pipe string.
5. the fracturing process of the multistage many bunches of fracturing strings of fixed tubular column water-jet according to claim 4, it is characterised in that complete before described equipment is gone into the well after preparation, with standby pressuring oil pipe by described pipe string lower going-into-well, then pipe nipple seat well head deeply and is joined in school.
6. the fracturing process of the multistage many bunches of fracturing strings of fixed tubular column water-jet according to claim 5, it is characterised in that by after in described pipe string lower going-into-well, low discharge capacity direct flushing, wash logical after pitching.
7. the fracturing process of the multistage many bunches of fracturing strings of fixed tubular column water-jet according to any one of claim 1 to 6, it is characterised in that after described pitching, improves pressure and the discharge capacity of oil pipe, adds sand and start perforation when rising to design load.
8. the fracturing process of the multistage many bunches of fracturing strings of fixed tubular column water-jet according to claim 7, it is characterized in that, oil jacket mixed water injection is carried out after completing perforation, rising to and start fracturing work after preset pressure value, described fracturing work includes: beats prepad fluid, add sand, beat displacement fluid again after complete design sand feeding amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410788821.6A CN105756647A (en) | 2014-12-17 | 2014-12-17 | Hydraulic jet fracturing method adopting multi-stage and multi-cluster string fracturing and utilizing immobile strings |
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| CN201410788821.6A CN105756647A (en) | 2014-12-17 | 2014-12-17 | Hydraulic jet fracturing method adopting multi-stage and multi-cluster string fracturing and utilizing immobile strings |
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Cited By (3)
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| CN107630690A (en) * | 2016-07-18 | 2018-01-26 | 中国石油天然气股份有限公司 | Fractured horizontal well device, fractured horizontal well system and its operating method |
| CN107630691A (en) * | 2016-07-18 | 2018-01-26 | 中国石油天然气股份有限公司 | Fractured horizontal well device, fractured horizontal well system and its operating method |
| CN110359893A (en) * | 2018-04-09 | 2019-10-22 | 中国石油天然气股份有限公司 | Mine sprays fracturing device and operational method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107630690A (en) * | 2016-07-18 | 2018-01-26 | 中国石油天然气股份有限公司 | Fractured horizontal well device, fractured horizontal well system and its operating method |
| CN107630691A (en) * | 2016-07-18 | 2018-01-26 | 中国石油天然气股份有限公司 | Fractured horizontal well device, fractured horizontal well system and its operating method |
| CN110359893A (en) * | 2018-04-09 | 2019-10-22 | 中国石油天然气股份有限公司 | Mine sprays fracturing device and operational method |
| CN110359893B (en) * | 2018-04-09 | 2021-11-30 | 中国石油天然气股份有限公司 | Mine jet fracturing device and operation method |
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