CN103450863B - A kind of low frictional resistance reservoir protection cement mortar - Google Patents
A kind of low frictional resistance reservoir protection cement mortar Download PDFInfo
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- CN103450863B CN103450863B CN201310355842.4A CN201310355842A CN103450863B CN 103450863 B CN103450863 B CN 103450863B CN 201310355842 A CN201310355842 A CN 201310355842A CN 103450863 B CN103450863 B CN 103450863B
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Abstract
This application provides a kind of low frictional resistance reservoir protection cement mortar, including the component of following weight portion: oil-well cement 100 parts；Cab-O-sil 0 40 parts；24 100 parts of flyash；Reinforcing agent 20 72 parts；High temperature fluid loss agent 36 parts；Retarder 04 parts；Defoamer 0.5 1 parts；Fresh water 60 185 parts.This cement slurry density is at 1.50g/cm3‑1.85g/cm3Between, and selection proper density can be adjusted according to formation condition.And its every side cost is only 1/3rd of floating bead system, for conventional 1.90g/cm3About the 80% of cement mortar cost, is therefore greatly saved production cost.Additionally can realize long open hole sealing, can replace floating bead low-density high-strength mortar architecture, click double sealing well cementation technique, as starch and add high density tail slurry system headed by soil paste and combine that the low cost of three, cement strength be high, the advantage of safety and environmental protection.
Description
Technical field
The present invention relates to oil drilling well cementation field, particularly relate to a kind of low frictional resistance reservoir of oil and gas reservoir
Protection cement mortar.
Background technology
The Caissons in JZ 9-3 Oil Field at Chinese Sea oil (Chinese) limited Tianjin Branch Company place and Qinhuangdao 32-6
There is multiple pressure regime in oil field, reservoir energy exhaustion is serious, and ' Safe Density Windows is narrow, adjusts well and uses big
Wells and horizontal well mode are developed.
In terms of well cementation, due to bore hole length, annular space frictional resistance greatly, cement mortar leakiness, easily pollutes reservoir；
Owing to needs long open hole sealing, shaft bottom and the well head temperature difference are big, it is badly in need of in the case of the big temperature difference keeping well head
The low-temperature high-early strength of cement；Due to multi pressure series of strata, difficult pressure is steady, and the easy water breakthrough of cement mortar easily causes water to bore,
Thus have influence on the recovery ratio of oil gas.
Domestic time sealing is carried out for big displacement long open hole reservoir, all use conventional 1.90g/cm3Conventional water
Mud or interpolation fiber sealing agent are cemented the well, but above method has the disadvantage in that
1, conventional 1.90g/cm3Cement mortar liquid column hydrostatic pressure is high, and long open hole section annular space frictional resistance is big, for storage
The layer serious interval of energy decline, easily causes formation fracture in well cementing process, cement mortar pollutes payzone；
2, tail pipe annular gap is little, utilizes fiber loss circulation material to easily cause stratum and suppresses stifled, and construction risk is big,
It is likely to result in and cements the well unsuccessfully；
If 3 use low-density hollow float bead mortar architecture, because floating bead granule relatively greatly and is hollow, slurry
It is easily broken thickening, the more conventional 1.90g/cm of annular space frictional resistance in long open hole section floating bead3Also want big, the most easily
Cause formation fracture, cause cement mortar to pollute payzone.
Therefore, in order to overcome the deficiencies in the prior art, it is badly in need of researching and developing a kind of oil and gas reservoir and rubs with low
Resistance reservoir protection cement mortar.
Summary of the invention
The purpose of the application is, it is provided that a kind of oil and gas reservoir is with low frictional resistance reservoir protection cement mortar.
To achieve these goals, the application adopts the following technical scheme that
A kind of low frictional resistance reservoir protection cement mortar, including the component of following weight portion:
In one embodiment, described oil-well cement can be G level oil-well cement.
In one embodiment, described Cab-O-sil can be 20-40 part, the purity of the most described Cab-O-sil
>=96%, mesh number is 100-120 mesh.
In one embodiment, described flyash can be national standard reference, and density range exists
2.0-2.30g/cm3。
In one embodiment, described reinforcing agent can be PC-BT3 reinforcing agent.
In one embodiment, described high temperature fluid loss agent can be AMPS class fluid loss agent or PVA
Class fluid loss agent；
In one embodiment, described AMPS class fluid loss agent can be PC-G80L；Described PVA
Class fluid loss agent can be PC-G75L (S).
In one embodiment, described retarder can be PC-H21L or PC-H41L.
In one embodiment, described defoamer can be phosphoric acid ester defoamer.
In one embodiment, described defoamer can be PC-X60L.
The key component of low frictional resistance reservoir protection cement mortar provided herein is described as follows:
Cab-O-sil: herein described Cab-O-sil has high temperature resistance strength retrogression function, typically at bottom hole static
Temperature less than 110 DEG C, Cab-O-sil dosage is 0 part, and low temperature does not exist strength retrogression problem；But higher than this
During temperature, the Cab-O-sil less than 40 parts need to be selected, be mainly in view of and take into account Behavior of Hardened Cement Paste early strength and final period
Intensity, crosses conference such as dosage and causes the early stage 24hr intensity of Behavior of Hardened Cement Paste not reach the operation of minimum 2000psi
Requirement, even if the too small meeting of content causes the Behavior of Hardened Cement Paste early strength can be the highest, but High Temperature Curing one week very
After one month, the comprcssive strength of Behavior of Hardened Cement Paste can drastically reduce, and has had a strong impact on the service life of oil well.
Flyash: national standard I class flyash, requires that density reaches 2.0-2.3g/cm simultaneously3.Select state
Family's standard I class flyash, the material granule being primarily due to I class standard is thin, loss on ignition is low, lives simultaneously
Property big, the intensity of Behavior of Hardened Cement Paste is high；Next needs the density of flyash low, because its Main Function is to reduce
The density of cement mortar, so can reduce the ratio of mud, realize the high intensity of Behavior of Hardened Cement Paste equally.Flyash
Number is 24-100 part, and when dosage is 24 parts, the density of Behavior of Hardened Cement Paste is 1.80g/cm3；Dosage is 100
During part, the density of Behavior of Hardened Cement Paste is 1.60g/cm3.If less than 24 parts, cement mortar is already close to conventional 1.90
g/cm3Density, adds the fewest flyash the most nonsensical, also cannot reduce the cost of every side cement mortar；
If higher than 100 parts, the density of Behavior of Hardened Cement Paste is less than 1.50g/cm3, now in Behavior of Hardened Cement Paste, cement proportion is very
Few, it is impossible to ensure to reach the minimum Behavior of Hardened Cement Paste comprcssive strength requirement of field operation within the effective time.
Reinforcing agent: can improve the suspendability of slurry, is greatly improved the comprcssive strength of Behavior of Hardened Cement Paste, main pin
Large-doping-amount fly ash cement slurry had more obvious potentiation.The dosage of reinforcing agent is 20-72 part,
The lowest meeting of dosage causes cement strength the highest, increases drilling platforms and waits the cost of curing time；Dosage
Too big, the high expensive of every side cement mortar, and slurry can obvious thickening, be unfavorable for pumping.
Fluid loss agent: can be AMPS class fluid loss agent, such as PC-G80L, it is also possible to for PVA class
Fluid loss agent, such as PC-G75L(S) or PC-G75L(L).The Main Function of fluid loss agent be
Under the high temperature and high pressure environment of shaft bottom, it is possible to effectively control dehydration.The dosage of fluid loss agent is 3-6 part, tool
Body dosage determines according to formation temperature, and low temperature dosage is few, and high temperature dosage is many, only need to meet API dehydration real
Test and require.The dehydration of dosage crosses that I haven't seen you for ages uncontrollable cement mortar, causes cement mortar in shaft bottom dehydration
Greatly, cement mortar aquation process of setting is unable to reach active strength；Dosage is excessive, the obvious thickening of cement mortar,
It is unfavorable for pumping, and cost increases.
Retarder: the effect of retarder is to meet cement mortar to have time enough to be pumped to target zone from well head
Before Wei, cement mortar does not haves the phenomenons such as thickening solidification in advance, and this retarder need to meet under middle hot environment
Requirement.When middle low temperature less than 50 DEG C (bottom-hole circulating temperature), dosage is 0 part can meet safety
The requirement of pump time, when bottom-hole static temperature 160 DEG C, dosage is 4 parts can meet the thickening time 6
Hour requirement.Dosage is too low, and cement mortar is thickened in advance, it may appear that well cementation accident, and dosage is excessive, leads
Cause Behavior of Hardened Cement Paste not solidify, delay site operation.
Low frictional resistance reservoir protection cement mortar in the application, has the advantages that
(1) density is at 1.50g/cm3-1.85g/cm3Between, and choosing can be adjusted according to formation condition
Select proper density.Depending on the determination Main Basis formation fracture pressure of cement slurry density and formation pore pressure,
The density of cement mortar determines the liquid column hydrostatic pressure of cement mortar, and liquid column hydrostatic pressure stratum to be maintained at
Between fracture pressure and formation pore pressure.Cement slurry density is too high can press Lou or crush stratum；Cement mortar
Density is too low it may happen that the major accident such as well kick or blowout.The low frictional resistance reservoir protection that the application provides
Cement mortar, density is at 1.50g/cm3～1.85g/cm3Between, show that it regulates space in the range of low-density
Very big, thus different pressure stratum can be suitable for.
(2) low frictional resistance reservoir protection cement mortar provided herein is (with 1.50g/cm3As a example by density)
Every side cost is only floating bead system (with 1.50g/cm3As a example by density) 1/3rd, for conventional 1.90
g/cm3About the 80% of cement mortar cost, is therefore greatly saved production cost.
(3) long open hole sealing can be realized, floating bead low-density high-strength mortar architecture can be replaced, click double sealing
Well technique, as headed by soil paste slurry add high density tail slurry system and combine the low cost of three, Behavior of Hardened Cement Paste
Intensity is high, the advantage of safety and environmental protection；
(4) slurry flowing performance-changing and settlement stability performance are good, φ 300 number of degrees ＜ 150(60 DEG C),
N value ＞ 0.7；
(5) Behavior of Hardened Cement Paste long-term strength is without decline；
(6) Behavior of Hardened Cement Paste has preferable elastoplasticity, and Behavior of Hardened Cement Paste elastic modelling quantity is 4-6GPa, and Poisson's ratio is
0.13-0.15, can at utmost keep the complete of pit shaft cement when pressure testing operation, perforation, acid fracturing
Property；
(7) for Slim Hole Cementing (7 ＂ or 5 ＂ tail pipes), more conventional 1.90g/cm3Density is cemented the well,
Annular space frictional resistance can reduce by more than 40%；
(8) fleeing proof effect of system is fabulous, and SPn value is about about 1.
Detailed description of the invention
By way of example the application will be described in further detail below, so that art technology
Personnel can put into practice the application.Should be appreciated that and can use other embodiments, and can make suitable
When change without departing from spirit herein or scope.In order to avoid for making those skilled in the art's energy
Details unnecessary for enough putting into practice the application, description may eliminate to be come for those skilled in the art
Say some information known.Therefore, described in detail below it is not taken in a limiting sense, and this
The scope of application is limited solely by the scope of the following claims.
Raw material used in following embodiment, reinforcing agent PC-BT3, fluid loss agent PC-G80L, slow setting
Agent PC-H21L and defoamer PC-X60L；It is limited that fluid loss agent PC-G75L is all CNOOC's clothes chemistry
The product of company, can buy acquisition from there；Remaining all can be obtained from commercially available.
Embodiment 1
A kind of low frictional resistance reservoir protection cement mortar (1.80g/cm3), including 100 parts of G level oil-well cements；
69 parts of fresh water；24 parts of flyash；26 parts of reinforcing agent PC-BT3；6 parts of fluid loss agent PC-G80L；0.3
Part retarder PC-H21L；0.4 part of defoamer PC-X60L.
Its preparation method is with reference to the in " GB/T19139-2003 " the 5th of " oil-well cement test method " the
Part, is " preparation of cement mortar ".
In order to preferably embody the performance advantage of herein described cement mortar, according to prior art conventional method
Prepare the cement mortar (1.90g/cm of following CNOOC Tianjin Branch Company onsite application3) as a comparison case 1,
It includes 800 parts of G level oil-well cements；307.9 parts of fresh water；50 parts of PC-G75L；3.5 parts of PC-H21L；
4 parts of defoamer PC-X60L.
Test condition and result
1, respectively the cement mortar in embodiment 1 and comparative example 1 is carried out system performance test, obtain such as table
Result shown in one:
Table one system performance comparison
As shown in Table 1, the cement mortar SPn value in embodiment 1 only 1.1, and the cement in comparative example 1
Slurry SPn value reaches 3.6, illustrates that the anti-channeling ability of cement mortar in embodiment 1 is fabulous.SPn specifically
Value reaction water fluid loss and the impact on has channeling of the cement slurry sets process resistance variation coefficient value, and
SPn value is the least, then anti-gas channeling ability is the strongest, specifically refers to: enterprise of China PetroChemical Corporation
Standard " Northeast Sichuan natural gas well cementing technology specification ", Q/SH0014-2007.SPn value is between 0～3
Fleeing proof effect is good, is closer to 0 the best.
2, respectively the cement mortar in embodiment 1 and comparative example 1 is carried out the test of rheological property, obtain as
Result shown in table two:
Table two rheological property contrasts
As shown in Table 2, slurry flowing performance-changing and settlement stability performance in embodiment one are good, φ 300
Number of degrees ＜ 150(60 DEG C), n value ＞ 0.7.
3, the tough elastic performance of Behavior of Hardened Cement Paste is carried out by after the grout cures in embodiment 1 and comparative example 1 respectively
Test, obtain result as shown in Table 3:
The tough elastic performance of table three Behavior of Hardened Cement Paste
Experiment condition: module is standard cylinder after cutting, waits solidifying 3 days for 40 DEG C, confined pressure 5MPa.
By the result of table three it can be seen that the Behavior of Hardened Cement Paste obtained after grout cures in embodiment 1 is elastic
Modulus is 3.68GPa, and Poisson's ratio is 0.18, has preferable elastoplasticity.
4, cement strength long-run development UCA experiment will be carried out after the grout cures in embodiment 1,
Obtain result as shown in Table 4:
Table four 1.80g/cm3Cement strength long-run development UCA tests
Remarks: maintenance in 90 DEG C of environment, use UCA monitoring.
By table four it can be seen that the Behavior of Hardened Cement Paste long-term strength in embodiment 1 is without decline.
5, to embodiment 1 and the simulation test one of comparative example 1 annular space frictional resistance
Table five CEM software simulation 9-5/8 " casing annulus frictional resistance result of calculation
Remarks: as a example by the practical situation of JX1-1A oil field, Tanggu, 9-5/8 ＂ sleeve pipe bore hole is without additional hours.
CEM software simulation 9-5/8 ＂ casing annulus frictional resistance result of calculation shows: as shown in Table 5, uses
Embodiment 1(low frictional resistance reservoir protection cement-slurry method 1.80g/cm3) normal compared with onsite application comparative example 1(
Rule cement-slurry method 1.90g/cm3) annular space frictional resistance minimizing 1.18MPa, annular space frictional resistance reduces 23.9%, has
It is beneficial to reduce pumping and the protection of reservoir of shaft bottom ECD, beneficially cement mortar.
6, to embodiment 1 and the simulation test two of comparative example 1 annular space frictional resistance
Table six CEM software simulation 7 " casing annulus frictional resistance result of calculation
Remarks: as a example by the practical situation of DF13-1 oil field, 7 ＂ sleeve pipe bore holes are without additional hours.
CEM software is simulated 7 ＂ casing annulus frictional resistance result of calculations and is shown: as shown in Table 6, uses and implements
Example 1(low frictional resistance reservoir protection cement-slurry method 1.80g/cm3) relatively onsite application comparative example 1(routine water
Mud prescription 1.90g/cm3) annular space frictional resistance minimizing 2.17MPa, annular space frictional resistance reduces 54.09%, is conducive to
Reduce pumping and the protection of reservoir of shaft bottom ECD, beneficially cement mortar.
Embodiment 2
A kind of low frictional resistance reservoir protection cement mortar (1.70g/cm3), including 100 parts of G level oil-well cements；
115 parts of fresh water；50 parts of flyash；35 parts of reinforcing agent PC-BT3；6 parts of fluid loss agent PC-G80L；2
Part retarder PC-H41L；40 parts of Cab-O-sils；0.5 part of defoamer PC-X60L.This formula is suitable for shaft bottom
Static temperature 150～use when 160 DEG C.
Its preparation method is with reference to the in " GB/T19139-2003 " the 5th of " oil-well cement test method " the
Part, is " preparation of cement mortar ".
Embodiment 3
A kind of low frictional resistance reservoir protection cement mortar (1.70g/cm3), including 100 parts of G level oil-well cements；
113 parts of fresh water；58 parts of flyash；52 parts of reinforcing agent PC-BT3；3 parts of fluid loss agent PC-G80L；0.5
Part defoamer PC-X60L.This formula is suitable for bottom-hole static temperature 40～uses when 50 DEG C.
Its preparation method is with reference to the in " GB/T19139-2003 " the 5th of " oil-well cement test method " the
Part, is " preparation of cement mortar ".
Embodiment 4
A kind of low frictional resistance reservoir protection cement mortar (1.60g/cm3), including 100 parts of G level oil-well cements；
175 parts of fresh water；90 parts of flyash；72 parts of reinforcing agent PC-BT3；6 parts of fluid loss agent PC-G80L；1
Part defoamer PC-X60L.This formula is suitable for bottom-hole static temperature 40～uses when 50 DEG C.
Its preparation method is with reference to the in " GB/T19139-2003 " the 5th of " oil-well cement test method " the
Part, is " preparation of cement mortar ".
Embodiment 5
A kind of low frictional resistance reservoir protection cement mortar (1.50g/cm3), including 100 parts of G level oil-well cements；
185 parts of fresh water；100 parts of flyash；25 parts of reinforcing agent PC-BT3；6 parts of fluid loss agent PC-G80L；
1 part of defoamer PC-X60L.This formula is suitable for bottom-hole static temperature 40～uses when 50 DEG C.
Its preparation method is with reference to the in " GB/T19139-2003 " the 5th of " oil-well cement test method " the
Part, is " preparation of cement mortar ".
In sum, these are only the preferred embodiment of the application, be not intended to limit the application's
Protection domain, therefore, all made within spirit herein and principle any amendment, equivalent,
Improve, within should be included in the protection domain of the application.
Claims (9)
1. one kind low frictional resistance reservoir protection cement mortar, it is characterised in that by the component group of following weight portion
Become:
Wherein, described reinforcing agent is PC-BT3 reinforcing agent.
Low frictional resistance reservoir protection cement mortar the most according to claim 1, wherein, described oil well water
Mud is G level oil-well cement.
Low frictional resistance reservoir protection cement mortar the most according to claim 1, wherein, described Cab-O-sil
For 20-40 part, purity >=96% of described Cab-O-sil, mesh number is 100-120 mesh.
Low frictional resistance reservoir protection cement mortar the most according to claim 1, wherein, described flyash
For national standard reference, and density range is at 2.0-2.30g/cm3。
Low frictional resistance reservoir protection cement mortar the most according to claim 1, wherein, described fall dehydration
Agent is AMPS class fluid loss agent or PVA class fluid loss agent.
Low frictional resistance reservoir protection cement mortar the most according to claim 5, wherein, described AMPS
Class fluid loss agent is PC-G80L；Described PVA class fluid loss agent is PC-G75L.
Low frictional resistance reservoir protection cement mortar the most according to claim 1, wherein, described retarder
For PC-H21L or PC-H41L.
Low frictional resistance reservoir protection cement mortar the most according to claim 1, wherein, described defoamer
For phosphoric acid ester defoamer.
Low frictional resistance reservoir protection cement mortar the most according to claim 8, wherein, described defoamer is
PC-X60L。
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| CN103923628B (en) * | 2014-04-17 | 2016-10-26 | 中国海洋石油总公司 | A kind of slim-hole single channel is cemented the well with low viscous cement slurry |
| CN104963653A (en) * | 2015-07-24 | 2015-10-07 | 中石化华东石油工程有限公司 | Cementing technology for 5.5-cun sleeve windowed side drilled slim hole |
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|---|---|---|---|---|
| CN101376580A (en) * | 2008-09-24 | 2009-03-04 | 西南石油大学 | Preparation of fly ash low density cement mortar |
| CN102604610A (en) * | 2012-02-10 | 2012-07-25 | 成都欧美科石油科技股份有限公司 | Elasto-plastic well cementing cement slurry and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101376580A (en) * | 2008-09-24 | 2009-03-04 | 西南石油大学 | Preparation of fly ash low density cement mortar |
| CN102604610A (en) * | 2012-02-10 | 2012-07-25 | 成都欧美科石油科技股份有限公司 | Elasto-plastic well cementing cement slurry and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 提高粉煤灰低密度水泥浆体系低温性能的研究;田野等;《科学技术与工程》;20130731;第13卷(第21期);第6237页第3.5节第2段 * |
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