CN107489396A - A kind of towed cementing method of small borehole bushing window sidetracking well - Google Patents
A kind of towed cementing method of small borehole bushing window sidetracking well Download PDFInfo
- Publication number
- CN107489396A CN107489396A CN201710845719.9A CN201710845719A CN107489396A CN 107489396 A CN107489396 A CN 107489396A CN 201710845719 A CN201710845719 A CN 201710845719A CN 107489396 A CN107489396 A CN 107489396A
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- China
- Prior art keywords
- short
- well
- circuit cycle
- drilling fluid
- towed
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
- E21B21/085—Underbalanced techniques, i.e. where borehole fluid pressure is below formation pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices, or the like for cementing casings into boreholes
Abstract
The present invention relates to a kind of towed cementing method of small borehole bushing window sidetracking well, belong to petroleum gas cementing technology field, its technical scheme is：Intelligent short-circuit cycle pipe nipple is together entered into well with well cementation tubing string；Former drilling fluid is injected, cleans annular space, is then implanted sequentially conventional very low-density drilling fluid (or clear water), insulating liquid, cement mortar and the former drilling fluid of specified quantitative；Open short-circuit cycle passage, conventional very low-density drilling fluid (or clear water) is entered annular space, when conventional very low-density drilling fluid (or clear water) completely by after, closing short-circuit cycle passage；Cement mortar is pressed into annular space using pressure differential, forms towed well cementation.The advantage of the invention is that：By reducing annulus fluid density, the stagnation pressure reduction for being subject to shaft bottom, shaft bottom is prevented by pressure break, drastically increase the one-time success rate of small borehole bushing window sidetracking well well cementation, ensure that cementing quality, reduce cost, avoid the pollution of oil-gas Layer.
Description
Technical field
The present invention relates to a kind of towed cementing method of small borehole bushing window sidetracking well, belongs to petroleum gas well cementation skill
Art field.
Background technology
In the drilling engineering of petroleum industry, cementing technology is that the barefoot interval cementing sealing that will be drilled is formed and can installed
The well of development equipment, cementing operation are that the cement mortar prepared is injected into well and sleeve pipe after setting of casing in the well being drilled
Annular space, Hou Ning, form firm cement sheath.Small borehole bushing window sidetracking well is to make use of cased wellbores more than casing damaged well section
From the offset well or adjustment well of the oil reservoir with a certain distance from casing damaged well section, it has drill change again with original ground DP technology flow
The features such as small investment, quick, well life-span suitable with the new well life-span.Slim Hole Sidetracking Technology is that China middle and later periods oil field is used to solve
Deformation well, accident well, deepened well and the important means for recovering production capacity with Development volue on old block.Due to small borehole bushing
Annular clearance is small when window sidetracking well is cemented the well, flow resistance is big, and one side displacement efficiency is poor, easy channelling, serious reduces well cementation matter
Amount, another aspect bottom pressure is larger, excessive bottom pressure fractured well bottom often, causes cement mortar to miss, and causes well cementation to be lost
Lose, can only subsequently take perforation to squeeze and block up to remedy, considerably increase well cementation cost, while cement mortar intrusion payzone can pollute oil gas
Layer, the rate of oil and gas recovery is reduced, so bottom pressure problems of too urgent need to resolve when small borehole bushing window sidetracking well is cemented the well.Mesh
Before, solve small borehole bushing window sidetracking well well cementation circulation problems frequently with low-density Antileakage Cement Slurry technology in casing and cementing,
But low-density cement mortar price is high, substantially increases well cementation cost.Meanwhile the density of cement mortar is lower, the performance of Behavior of Hardened Cement Paste is got over
Difference, reduce cementing quality, it is impossible to reach preferably well cementation effect.Therefore, towed cementing method can be effective from technique
The difficulty such as leakage, displacement efficiency difference caused by solution small borehole bushing window sidetracking well annular clearance is small, flow resistance is big, pump pressure is high
Topic.
The content of the invention
The defects of it is an object of the invention to overcome prior art, spy provide a kind of small borehole bushing window sidetracking well traction
Formula cementing method, it has construction is simple, and reliability is high, practical, can effectively solve the problem that small borehole bushing window sidetracking well
The problems such as leakage, of poor quality, cost is high, pollution oil-gas Layer in well cementing operation.
The purpose of the present invention is achieved through the following technical solutions：A kind of towed well cementation of small borehole bushing window sidetracking well
Method, it comprises the following steps：
A, intelligent short-circuit cycle pipe nipple top connects drill string I, and bottom connects drill string II, together enters well with well cementation tubing string, and ensure
Intelligent short-circuit cycle pipe nipple is at the 50m-100m of extension hanger upper end；
B, former drilling fluid, cleaning well cementation tubing string and annular space are circulated, ensures that well cementation tubing string inner passage and annulus access are unimpeded
It is without hindrance；
C, the conventional very low-density drilling fluid (or clear water) of specified quantitative is injected into well cementation tubing string, former drilling fluid is replaced, pushes away
Dynamic intelligence decoding glue core I moves downward, and when intelligently decoding glue core I reaches the ad-hoc location of intelligent short-circuit cycle pipe nipple, intelligence is short
Road circulating sub receives decoding open signal I, and control short-circuit cycle passage is opened；
D, after the completion of conventional very low-density drilling fluid (or clear water) is injected, start to inject into well cementation tubing string successively and isolate
Liquid and cement mortar, intelligence decoding glue core II is promoted to move downward；
E, after the completion of cement mortar injection, former drilling fluid is injected into well cementation tubing string；
F, when intelligence decoding glue core II reaches the ad-hoc location of intelligent short-circuit cycle pipe nipple, intelligent short-circuit cycle pipe nipple receives
Shutdown signal II is decoded, control short-circuit cycle passage is closed；
G, continue to inject former drilling fluid into well cementation tubing string, promote cement mortar to enter annular space, until top cement plug bruising, stop
Pump, Hou Ning.
The described liquid for being used to replace former drilling fluid is conventional very low-density drilling fluid (or clear water), is injected conventional special low
The amount of density drilling fluid (or clear water) can just be full of intelligent short-circuit cycle pipe nipple upper end annular space.
Described short-circuit cycle passage connects well cementation tubing string inner passage and annular space, makes under intelligent short-circuit cycle pipe nipple (6a)
The passage short circuit at end, ensure the ring that conventional very low-density drilling fluid (or clear water) smoothly can enter more than intelligent short-circuit cycle pipe nipple
It is empty.
Described intelligent short-circuit cycle pipe nipple carries out open and close and acted twice：Triggered for the first time by intelligence decoding glue core I, intelligence
The control system of energy short-circuit cycle pipe nipple receives identification decoding open signal I, control short-circuit cycle passage opening；Lean on intelligence for the second time
Glue core II can be decoded to trigger, the control system of intelligent short-circuit cycle pipe nipple receives identification decoding shutdown signal II, and control short circuit follows
Ring passage is closed.
Described intelligence decoding glue core I and the center of intelligence decoding glue core II are hollow, can be passed through for liquid.
Described short-circuit cycle passage is closed when going into the well.
A kind of described towed cementing method of small borehole bushing window sidetracking well, utilizes the fluid column and ring cemented the well in tubing string
The pressure differential formed between empty fluid column, cement mortar is pressed into by annular space based on self-balancing principle, forms towed well cementation.
Compared with prior art, the beneficial effects of the invention are as follows：Replaced using conventional very low-density drilling fluid (or clear water)
Former drilling fluid, due to Action of Gravity Field during well cementation, head of liquid is cemented the well in tubing string less than head of liquid in well cementation tubing string in annular space
Pressure differential is automatically formed between fluid column and annular space fluid column, to reach pressure balance, cement mortar is formed towed automatically into annular space
Well cementation, the stagnation pressure reduction for being subject to shaft bottom, effectively prevent shaft bottom by pressure break, guarantee cementing quality.The Small Well can effectively be overcome
The problem such as leakage, displacement efficiency difference caused by eye casing window sidetracking well well cementation annular clearance is small, flow resistance is big, pump pressure is high,
And then improve cementing quality, success rate of cementing the well and the target for reducing cost.
Brief description of the drawings
Fig. 1 is the view for circulating former drilling fluid.
Fig. 2 is the view for injecting conventional very low-density drilling fluid (or clear water).
Fig. 3 is the view for injecting insulating liquid.
Fig. 4 is the view for injecting cement mortar.
Fig. 5 is the view of bottom plug rupture of membranes.
Fig. 6 is the view of top cement plug bruising.
In figure：1-top cement plug, 2-bottom plug, 3-intelligence decoding glue core II, 4-intelligence decoding glue core I, 5-drill string I,
6a-intelligent short-circuit cycle pipe nipple, 6b-short-circuit cycle passage, 7-drill string II, 8-extension hanger, 9-sleeve pipe, 10-ring
Sky, 11-barefoot interval, 12-float collar, 13-guide shoe, 14-former drilling fluid, 15-conventional very low-density drilling fluid (or it is clear
Water), 16-insulating liquid, 17-cement mortar.
Embodiment
In order that technical characteristic, purpose and the beneficial effect of the present invention can be more clearly understood, with reference to embodiment
The present invention will be further described in detail.But the part of the embodiment of the described simply present invention, do not include all implementing
Example, it is impossible to be interpreted as the limitation to the scope of the present invention.
A kind of towed cementing method of small borehole bushing window sidetracking well, its specific operating procedure are：
A, the top of drill string I 5 connects cementing head, and the bottom of drill string I 5 connects intelligent short-circuit cycle pipe nipple 6a, intelligent short-circuit cycle pipe nipple
6a bottoms connect drill string II 7, and the bottom of drill string II 7 connects extension hanger 8, the bottom female connector tubing string of extension hanger 8, and casing string includes set
Pipe 9, float collar 12 and guide shoe 13, by casing string tripping in barefoot interval 11；
B, pitching is built the pressure, and packer is realized and set；
C, continue to suppress, suppress logical ball seat, establish normal circulation；
D, former drilling fluid 14, cleaning well cementation tubing string and annular space 10 are circulated, ensures that well cementation tubing string inner passage is logical with annular space 10
Road is unblocked；
E, the conventional very low-density drilling fluid (or clear water) 15 of specified quantitative is injected into well cementation tubing string, promotes intelligence decoding glue
Core I 4 moves downward, and when intelligently decoding glue core I 4 reaches intelligent short-circuit cycle pipe nipple 6a ad-hoc location, intelligent short-circuit cycle is short
Save 6a and receive decoding open signal I, control short-circuit cycle passage 6b is opened；
F, after the completion of conventional very low-density drilling fluid (or clear water) 15 is injected, start to inject specified quantitative into well cementation tubing string
Insulating liquid 16 and cement mortar 17, intelligence decoding glue core II 3 is promoted to move downward；
G, when the ad-hoc location for intelligently decoding the intelligent short-circuit cycle pipe nipple 6a of the arrival of glue core II 3, intelligent short-circuit cycle pipe nipple
6a receives decoding shutdown signal II, and control short-circuit cycle passage 6b is closed；
H, inject after the completion of cement mortar 17, injecting former drilling fluid 14 into well cementation tubing string is circulated, the rupture of membranes of bottom plug 2,
Annular space 10 between the sleeve pipe 9 of cement mortar 17 and barefoot interval 11, cement mortar 17 replace former drilling fluid 14；
I, until the bruising of top cement plug 1, geostatic pressure rise certain value quickly, the signal instruction cement mortar 17 has replaced
Position, construction terminate；
J, termination of pumping, Hou Ning.
The great representativeness of above example, has simple to operate, securely and reliably, can realize stable well cementation effect, carry
High cementing quality, has saved well cementation cost, can preferably realize cementing method of the present invention.
Claims (7)
1. a kind of towed cementing method of small borehole bushing window sidetracking well, it is characterised in that it comprises the following steps：
a：Drill string I (5) top connects cementing head, and drill string I (5) bottom connects intelligent short-circuit cycle pipe nipple (6a), and intelligent short-circuit cycle is short
Section (6a) bottom connects drill string II (7), and drill string II (7) bottom connects extension hanger (8), extension hanger (8) bottom female connector tubing string,
Casing string includes sleeve pipe (9), float collar (12) and guide shoe (13), by casing string tripping in barefoot interval (11), and ensures intelligent short circuit
Circulating sub (6a) is at extension hanger (8) upper end 50m-100m；
b：Former drilling fluid (14), cleaning well cementation tubing string and annular space (10) are circulated, ensures well cementation tubing string inner passage and annular space (10)
Passage is unblocked；
c：The conventional very low-density drilling fluid (or clear water) (15) of specified quantitative is injected into well cementation tubing string, promotes intelligence decoding glue core
I (4) move downward, and when intelligently decoding glue core I (4) reaches the ad-hoc location of intelligent short-circuit cycle pipe nipple (6a), intelligent short circuit follows
Ring pipe nipple (6a) receives decoding open signal I, and control short-circuit cycle passage (6b) is opened；
d：When conventional very low-density drilling fluid (or clear water) (15) inject after the completion of, start to well cementation tubing string in be implanted sequentially it is specific
The insulating liquid (16) and cement mortar (17) of amount, intelligence decoding glue core II (3) is promoted to move downward；
e：When intelligently decoding glue core II (3) reaches the ad-hoc location of intelligent short-circuit cycle pipe nipple (6a), intelligent short-circuit cycle pipe nipple
(6a) receives decoding shutdown signal II, and control short-circuit cycle passage (6b) is closed；
f：Inject after the completion of cement mortar (17), injecting former drilling fluid (14) into well cementation tubing string is circulated, and promotes cement mortar
(17) annular space (10) is entered；
g：After top cement plug (1) bruising, termination of pumping, Hou Ning.
A kind of 2. towed cementing method of small borehole bushing window sidetracking well according to claim 1, it is characterised in that：With
It is conventional very low-density drilling fluid (or clear water) (15) in the liquid of the former drilling fluid (14) of replacement, the conventional very low-density of injection bores
The amount of well liquid (or clear water) (15) can just be full of intelligent short-circuit cycle pipe nipple (6a) upper end annular space (10).
A kind of 3. towed cementing method of small borehole bushing window sidetracking well according to claim 1, it is characterised in that：It is short
Road circulation canal (6b) connects well cementation tubing string inner passage and annular space (10), makes the passage of intelligent short-circuit cycle pipe nipple (6a) lower end
Short circuit.
A kind of 4. towed cementing method of small borehole bushing window sidetracking well according to claim 1, it is characterised in that：Gu
Intelligent short-circuit cycle pipe nipple (6a) progress open and close act twice during well, for the first time by intelligently decoding glue core I (4) triggering, intelligence
The control system of energy short-circuit cycle pipe nipple (6a) receives identification decoding open signal I, control short-circuit cycle passage (6b) opening；The
Secondary to be triggered by intelligently decoding glue core II (3), the control system of intelligent short-circuit cycle pipe nipple (6a), which receives identification decoding and closed, to be believed
Number II, control short-circuit cycle passage (6b) is closed.
A kind of 5. towed cementing method of small borehole bushing window sidetracking well according to claim 1, it is characterised in that：Intelligence
It is hollow that the center of glue core I (4) and intelligence decoding glue core II (3), which can be decoded,.
A kind of 6. towed cementing method of small borehole bushing window sidetracking well according to claim 1, it is characterised in that：It is short
Road circulation canal (6b) is closed when going into the well.
A kind of 7. towed cementing method of small borehole bushing window sidetracking well according to claim 1, it is characterised in that：Profit
With the pressure differential between the fluid column and annular space (10) fluid column in well cementation tubing string, cement mortar (17) is pressed into by ring based on self-balancing principle
Empty (10), form towed well cementation.
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| CN201710845719.9A CN107489396B (en) | 2017-09-19 | 2017-09-19 | A kind of towed cementing method of small borehole bushing window sidetracking well |
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| CN201710845719.9A CN107489396B (en) | 2017-09-19 | 2017-09-19 | A kind of towed cementing method of small borehole bushing window sidetracking well |
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| CN107489396B CN107489396B (en) | 2019-07-19 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108979583A (en) * | 2018-07-12 | 2018-12-11 | 马弘毅 | A kind of sidetracked hole layer and section cementing unit and application method |
| CN109403916A (en) * | 2018-12-05 | 2019-03-01 | 田振林 | A kind of thermally conductive well shaft fixing technology of geothermal well |
| CN111706259A (en) * | 2020-07-14 | 2020-09-25 | 中国石油集团渤海钻探工程有限公司 | Method for solving casing deformation by sidetracking old well paste-salt section reaming unfixed well |
| CN112943161A (en) * | 2021-01-14 | 2021-06-11 | 中国石油天然气股份有限公司 | Side drilling is exempted from to hang and can be lost hand well cementation well completion device |
| CN114109309A (en) * | 2020-08-28 | 2022-03-01 | 中国石油化工股份有限公司 | Underground infinite-stage fracturing sliding sleeve |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108979583A (en) * | 2018-07-12 | 2018-12-11 | 马弘毅 | A kind of sidetracked hole layer and section cementing unit and application method |
| CN108979583B (en) * | 2018-07-12 | 2020-11-17 | 福州宇卓科技有限公司 | Sidetracking well layering and segmenting cementing device and using method |
| CN109403916A (en) * | 2018-12-05 | 2019-03-01 | 田振林 | A kind of thermally conductive well shaft fixing technology of geothermal well |
| CN111706259A (en) * | 2020-07-14 | 2020-09-25 | 中国石油集团渤海钻探工程有限公司 | Method for solving casing deformation by sidetracking old well paste-salt section reaming unfixed well |
| CN114109309A (en) * | 2020-08-28 | 2022-03-01 | 中国石油化工股份有限公司 | Underground infinite-stage fracturing sliding sleeve |
| CN112943161A (en) * | 2021-01-14 | 2021-06-11 | 中国石油天然气股份有限公司 | Side drilling is exempted from to hang and can be lost hand well cementation well completion device |
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