CN104963653A - Cementing technology for 5.5-cun sleeve windowed side drilled slim hole - Google Patents
Cementing technology for 5.5-cun sleeve windowed side drilled slim hole Download PDFInfo
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- CN104963653A CN104963653A CN201510437583.9A CN201510437583A CN104963653A CN 104963653 A CN104963653 A CN 104963653A CN 201510437583 A CN201510437583 A CN 201510437583A CN 104963653 A CN104963653 A CN 104963653A
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Abstract
The invention relates to the cementing technology for a 5.5-cun sleeve windowed side drilled slim hole, and the technology is that prepared cement mortar replaces the cementing technology under the condition of small gaps. The cementing technology is characterized in that the cement mortar is prepared by the following components, by weight, 100 parts of G-grade oil well cement, 15 to 25 parts of floaters, 10 to 20 parts of reinforcing agent, 2 to 3 parts of fluid loss additive, 0.4 to 0.8 part of drag reducer,0.2 to 0.4 part of retarder, 75 to 95 parts of water and 1 to 2 parts of inorganic fiber. A method replacing a method about annular plug flow state is provided. The annular hydrostatic fluid column pressure in the cementing technology for a slim hole can be reduced, a leakproof function can be achieved, and defects caused by a thin cement ring can effectively overcome.
Description
Technical field
The present invention relates to a kind of reinforcing oil well completion technique field, particularly a kind of 5 cun of half-covering tube window sidetracking Slim Hole Cementing techniques.
Background technology
Production string window sidetracking is that original oil zone is vitalized abandoned well, improved the important means of recovery ratio.But when entering φ 88.9mm drilling liner cementing under 5 cun of half-covering tube window sidetracking slim-holes, because the annular space gap between sleeve pipe and the borehole wall is little, the cement sheath formed is thinner, easily broken, affects sealing quality.In well cementing process, cement paste returns frictional resistance large, annular equivalent density increases greatly, leaks stratum through normal pressure, causes cement paste to miss low returning; Cementing quality problem has had a strong impact on oil well subsequent development.
Along with the increase of the oil-gas field development time limit, old street district is on the increase, sidetracked hole Slim Hole Cementing there has also been certain development, current sidetracked hole SLIM HOLE CEMENTING TECHNOLOGY mainly adopts and in cement paste, adds agent for anti gassing-out, two solidifying cement pastes etc. carry out anti-channeling, adopt low-density cement mortar to carry out leakproof, focus on anti-gas channeling and leakproof.Some technique also cleans from well, the operation of drifting circulation measure and extension hanger to improve workmanship, above well shaft fixing technology serves certain effect, for contribution has been made in the development of sidetracked hole Slim Hole Cementing technique.But said method does not solve thin, the breakable problem of slim-hole cement sheath; The small displacement that refer to also had replaces, but can not provide the computational methods replacing discharge capacity, causes scene not easy to operate.
201110278579.4 " a kind of low pressure reservoirs sidetracked hole well cementation well-completing process " describe several leakproof instrument and low-density cement mortar with the use of, for the leakproof of well cementing process.The cost that this employing leakproof instrument carries out leakproof is higher, and downhole operations is wayward, occurs that the Hazard ratio of down-hole accident is comparatively large, and does not have proposition and solve cement sheath thin, breakable problem.
200310121884.8 " large tail pipe sidetracked hole cementing technologies " describe a kind of well expanding method, under enter the well shaft fixing technology that the large tail pipe of φ 101.6mm replaces φ 88.9mm little tail pipe, in this process, reaming has larger risk, and the waste duration.
Summary of the invention
The object of the invention is the technical barrier of solution 5 cun of half-covering tube window sidetracking Slim Hole Cementings, solve and utilize that cementing tool leakproof operational risk in down-hole is large, the problems such as large scale sleeve pipe has a big risk, the cycle is long under reaming.
To achieve these goals, technical scheme of the present invention is to provide 5 cun of half-covering tube window sidetracking Slim Hole Cementing techniques, cement paste displacement cementing under small―gap suture condition is prepared in employing, and cement paste preparation is made up of following component and parts by weight G level oil well cement 100 parts, drift pearl 15-25 part, reinforcing agent 10-20 part, filtrate loss reduction additive 2-3 part, drag reducer 0.4-0.8 part, retarding agent 0.2-0.4 part, water 75-95 part and inorfil (the long 6mm of fiber) 1-2 part;
Replace and adopt annular space plug flow fluidised form displacement method, adopt annular space plug flow fluidised form displacement method to comprise:
Step 1, determine reheology model
B=(φ200-φ100)/(φ300-φ100)
Step 2, differentiation fluidised form
N=2.096lg(φ300/φ100)， K=0.511φ300/511n
Step 3, plug flow annular space critical flow velocity calculate
Step 4, critical gelation point calculate
Qc=πVc ( D
2-d
2)/4
B is reheology model; N is Rheological Index; K is viscosity factor; Re is plug flow critical Reynolds number, value 100; Vc is plug flow critical flow velocity; Qc is plug flow critical gelation point; D is hole diameter; D is sleeve outer; Reading when φ 100 is six fast viscosity apparatus 100 turns; Reading when φ 200 is six fast viscosity apparatus 200 turns; Reading when φ 300 is six fast viscosity apparatus 300 turns.
The fibre length of inorfil is 6mm.
The invention has the beneficial effects as follows:
1, invented a set of toughness low weight cement slurry, this mortar architecture is drawn by laboratory test, and this cement paste weight density can be down to 1.30-1.50g/cm
3, the requirement that Slim Hole Cementing reduces annular space liquid column hydrostatic pressure can be met, effectively play leakproof effect, effectively make up the next defect of cement sheath strip.
2,2013-2014 2 years, use this this cover well shaft fixing technology, complete cementing operation 11 mouthfuls altogether at northern Suzhou You Qu, cement paste returns height and all reaches designing requirement, wherein 5 mouthfuls outstanding, 6 mouthfuls are good, cementing quality acceptance rate 100%.
3, make use of rheology to calculate annular space fluidised form, determine in sidetracked hole Slim Hole Cementing, adopt plug flow fluidised form to carry out leakproof and to improve cementing quality.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
embodiment is side Bei1-11Jing:
1, casing programme tables of data
2, mortar architecture formula is adopted
Cement paste proportion: 1.40g/cm
3, parts by weight: G level oil well cement (south of the River G level) 100 parts, drift 18 parts, pearl, reinforcing agent (superfine cement) 12 parts, filtrate loss reduction additive (G304) 3 parts, drag reducer (USZ) 0.5 part, retarding agent (GH-6) 0.2 part, 85 parts, water and inorfil (the long 6mm of fiber) 2 parts composition;
3, this hole plug stream critical gelation point calculates
1, slurry flowing performance-changing table
2, reheology model is determined
B=(φ200-φ100)/(φ300-φ100)=0.26≠0.5±0.03
Power law reheology model selected by cement paste
3, fluidised form is differentiated
n=2.096 lg(φ300/φ100)=0.62 K=0.511φ300/511n=1.46Pa.sn
4, annular space plug flow critical flow velocity calculates
=0.44m/s
5, plug flow critical gelation point calculates
Q
C=πV
C( D
2-d
2)/4 =3.12L/s
Wherein B is reheology model; N is Rheological Index; K is viscosity factor; Re is plug flow critical Reynolds number, value 100; Vc is plug flow critical flow velocity, m/s; Qc is plug flow critical gelation point, l/s; D is hole diameter, cm; D is sleeve outer, cm; Reading when φ 100 is six fast viscosity apparatus 100 turns; Reading when φ 200 is six fast viscosity apparatus 200 turns; Reading when φ 300 is six fast viscosity apparatus 300 turns.
Claims (3)
1.5 cun of half-covering tube window sidetracking Slim Hole Cementing techniques, cement paste displacement cementing under small―gap suture condition is prepared in employing, it is characterized in that: cement paste preparation is made up of following component and parts by weight G level oil well cement 100 parts, drift pearl 15-25 part, reinforcing agent 10-20 part, filtrate loss reduction additive 2-3 part, drag reducer 0.4-0.8 part, retarding agent 0.2-0.4 part, water 75-95 part and inorfil 1-2 part, replaces and adopts annular space plug flow fluidised form displacement method.
2. 5 cun of half-covering tube window sidetracking Slim Hole Cementing techniques according to claim 1, is characterized in that adopting annular space plug flow fluidised form displacement method to comprise:
Step 1, determine reheology model
B=(φ200-φ100)/( φ300-φ100)
Step 2, differentiation fluidised form
n=2.096lg(φ300/φ100)， K=0.511φ300/511n
Step 3, plug flow annular space critical flow velocity calculate
Step 4, critical gelation point calculate
Qc=πVc ( D
2-d
2)/4；
Wherein B is reheology model; N is Rheological Index; K is viscosity factor; Re is plug flow critical Reynolds number, value 100; Vc is plug flow critical flow velocity; Qc is plug flow critical gelation point; D is hole diameter; D is sleeve outer; Reading when φ 100 is six fast viscosity apparatus 100 turns; Reading when φ 200 is six fast viscosity apparatus 200 turns; Reading when φ 300 is six fast viscosity apparatus 300 turns.
3. 5 cun of half-covering tube window sidetracking Slim Hole Cementing techniques according to claim 1, is characterized in that: the fibre length of inorfil is 6mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510437583.9A CN104963653A (en) | 2015-07-24 | 2015-07-24 | Cementing technology for 5.5-cun sleeve windowed side drilled slim hole |
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| CN201510437583.9A CN104963653A (en) | 2015-07-24 | 2015-07-24 | Cementing technology for 5.5-cun sleeve windowed side drilled slim hole |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298440A (en) * | 2015-10-27 | 2016-02-03 | 中国石油天然气股份有限公司 | Design method of well cementation annulus slurry column structure |
| CN107489396A (en) * | 2017-09-19 | 2017-12-19 | 西南石油大学 | A kind of towed cementing method of small borehole bushing window sidetracking well |
| CN113060993A (en) * | 2021-04-06 | 2021-07-02 | 中海石油(中国)有限公司 | Drag reduction material for fine pressure control well cementation and drag reduction cement slurry |
| CN116023052A (en) * | 2021-10-25 | 2023-04-28 | 中石化石油工程技术服务有限公司 | Cement additive, cement composition and cement paste |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298440A (en) * | 2015-10-27 | 2016-02-03 | 中国石油天然气股份有限公司 | Design method of well cementation annulus slurry column structure |
| CN105298440B (en) * | 2015-10-27 | 2018-08-14 | 中国石油天然气股份有限公司 | A kind of design method of well cementation annular space slurry rod structure |
| CN107489396A (en) * | 2017-09-19 | 2017-12-19 | 西南石油大学 | A kind of towed cementing method of small borehole bushing window sidetracking well |
| CN107489396B (en) * | 2017-09-19 | 2019-07-19 | 西南石油大学 | A kind of towed cementing method of small borehole bushing window sidetracking well |
| CN113060993A (en) * | 2021-04-06 | 2021-07-02 | 中海石油(中国)有限公司 | Drag reduction material for fine pressure control well cementation and drag reduction cement slurry |
| CN113060993B (en) * | 2021-04-06 | 2022-04-19 | 中海石油(中国)有限公司 | Drag reduction material for fine pressure control well cementation and drag reduction cement slurry |
| CN116023052A (en) * | 2021-10-25 | 2023-04-28 | 中石化石油工程技术服务有限公司 | Cement additive, cement composition and cement paste |
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