CN100344723C - Comprehensive performace regulator for well cementing cement slurry and its prepn - Google Patents
Comprehensive performace regulator for well cementing cement slurry and its prepn Download PDFInfo
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- CN100344723C CN100344723C CNB2006100203497A CN200610020349A CN100344723C CN 100344723 C CN100344723 C CN 100344723C CN B2006100203497 A CNB2006100203497 A CN B2006100203497A CN 200610020349 A CN200610020349 A CN 200610020349A CN 100344723 C CN100344723 C CN 100344723C
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Abstract
The present invention relates to a comprehensive performance regulator for well cementing cement slurry and a preparation process thereof. 68 to 73 wt% of sepiolite fiber, 7 to12 wt% of sodium hydroxide solution, 18 to 23 wt% of sodium dodecyl sulfate solution and 0.5 to 1 wt% of sodium gluconate solution are mixed, and baked and processed into a modified sepiolite fiber with a length of 0.1 to 0.5cm and a length diameter ratio of 4 to 10.2 to 5 wt% of modified sepiolite fiber, 4 to 10 wt% of diatomite, 25 to 30 wt% of micro silicon, 35 to 40 wt% of expanded perlite, 16 to 22 wt% of calcium bentonite, 8 to 15 wt% of CaO and 2 to 5 wt% KCl are evenly mixed, and the performance regulator can be obtained. A cement slurry system can be made from the regulator and other additives for single-time cementing a complex well sealing section with large temperature difference without regulation; the regulator has the advantages of low filtration, high flowability, short transition time, high interface cementing strength, favorable thixotropic performance and favorable comprehensive gas channeling preventing performance of right angle coagulation, and is suitable for well cementing construction in a complicated stratum.
Description
Technical field
The present invention relates to a kind of oil gas well cementing operation grout comprehensive performace regulator and preparation method thereof.
Background technology
In the process of oil-gas field development, well cementation is important step of drilling engineering.It not only can guarantee high yield, the stable yields of oil gas well, and can prolong the life-span of oil gas well; Improve the rate of oil and gas recovery.In the process of well cementation, often run into the cementing job of complicated well and bad ground, existing technology in the cementing operation of bad ground, exist complex operation, dosing often, shortcomings such as the well cementation success ratio is low, cementing quality is bad, well cementation cost height.Particularly the long interval isolation of bad ground exists the section of the going into the well temperature difference big, ground interlayer pressure surge is big, when bringing huge variation to the performance of grout, often cause the bottom to the cement solidifies and not coagulating for a long time appears in top cement, make the has channeling odds increase, prolonged completion period, construction wrong even can cause cementing practice failure.Both at home and abroad adopt multistage cementing technology or two cement technology that coagulates more, but increase the lab and field difficulty of construction, and two rapid hardening section of coagulating cement up and down partly gas scurry and logically also often can't avoid; Useful high temperature retarder is adjusted the setting rate of the grout under the hot conditions, make every effort to make under thickening time of high temperature section cement and time of coagulation and the low temperature and reach unanimity, but effect is undesirable, and still lacks good simultaneously good with other cement additive compatiblenesies retardant of high temperature resistance at present.
Has channeling problem in the well cementation process always is the great difficult problem that casing and cementing faces.According to interface agglutination theory, weightless theory and penetration theory, developed impermeable cement abroad, delay gelatinizing cement, expansive cement, system such as inflation cement etc. has domesticly also been developed various agent for anti gassing-out in succession, all is used for site operation as SPE swelling agent, KQ agent for anti gassing-out etc.But it is single that these anti-gas channeling cement often act on, and exists compatibleness, temperature control to be difficult for defectives such as grasp simultaneously, and result of use is unsatisfactory.
Aspect the oil well cement additive development research, there is bibliographical information in cement, to add hydraulic material or lateral reactivity material (as little silicon, diatomite, pearlstone or the like), make the abundant aquation of hydraulic material; The method of lateral reactivity material and cement neutral and alkali material generation chemical reaction improves cement intensity.Contain highly active α-SiO in pearlstone and the little silicon
2, more than 30 ℃ just can and the Ca (OH) of hydrated cementitious generation
2Reaction generates gel of calcium silicate (C-S-H), impels strength of cement to grow, and adds CaO, KCl and can further activate the active material reaction.Pearlstone has contribution to cement stone ultimate compression strength, and little silicon is big to the contribution of the intensity under the low temperature.
The application of little silicon in cement is very wide, and summarizing to get up mainly is activity, filling effect and the volcanic ash effect of utilizing little silicon, produces body of cement early strong, high-strength, that erosion resistance is good, rate of permeation is low, heat-resisting property is good, anti-impact mill property is good.There have been many breakthroughs the aspects such as mechanism of improving the hydrated cement paste bulk microstructure of mixing of silica flour, as the drying shrinkage of hardened cement paste and mechanism, the chemical resistance of concrete performance that improves hardened cement paste and the mechanism of weather resistance etc. of the volume stability that influences mechanism, increase hardened cement paste of creeping have all been had relative clear conclusions.The diatomite main component is an active silica albumen, can participate in hydrated reaction of cement under the certain temperature, to the effect that cement has tackify to suspend, can reduce final setting time just.Wilkinite is usually used in preparing low-density grout as a kind of lightening material of oil well cement, utilizes the well cementation of bentonite cement slurry respond well.Wilkinite is met the pressure-losses of the weightlessness of water hydratable expansion compensation grout post, and the denseness rising produces thixotropy and stops the outside fluid intrusion, reduces characteristics such as worry property lost and the anti-oil gas erosional competency of increase.Bentonite modified grout can be resisted body of cement and shrink, and emits gradually behind the absorption excessive moisture and prevents to produce capillary channel, and expansion can reduce cement stony fracture line and play densification, and does not influence the rheological of grout.
Fiber is used for cementing the well and improves the effect of cement stone mechanical property and consolidation strength.Sepiolite fibre is fully played the effect of fiber through having increased the cohesive force between fiber and the cement after the modification.
At " application of gain in strength agent under the phreatic water mudstone low temperature " (Ju Ling, " drilling fluid and well finishing liquid " 2004/03) in the literary composition at the Zhongyuan Oil Field hydrocarbon zone bury deeply, be difficult for solidifying under the oil gas dispersion, underground temperature gradient height, deep-well bottom temperature height, sealing segment length, grout low temperature, the cement strength development waits problem slowly, developed a kind of cement stone toughener G606.Mainly be that to emit the reaction of ion and retardant behind the high temperature action be that retardant lost efficacy and realizes solidifying of grout under the cold condition.The following thickening time of low temperature is shortened relatively, and cement strength development is normal, has overcome that retardant makes the long-term noncondensing problem of grout under the low temperature, and then difference is therewith fully for the mechanism of action of this comprehensive performace regulator.
The present invention is the comprehensive described principle of above domestic and foreign literature data, proposed to highly active sepiolite fibre carry out modification and little silicon, diatomite, calcium bentonite, pearlstone isoreactivity material is composite, and activate these active materials with alkaline activating agent and participate in hydration reaction, give full play to the method for various active materials to the improvement effect of cement slurry property.Hydration reaction down just can take place rapidly in the active material cold condition, promptly promotes the cement strength growth at low temperatures, makes cement thickening time and gain in strength under the cold condition consistent with cement thickening time and gain in strength trend under the middle hot conditions.This comprehensive performace regulator is from shortening transit time; Improve interface cementing strength; Impel early strength to develop rapidly; Improve thixotropic property; Make many-sides such as grout right angle multiviscosisty act on grout to improve its anti-gas channeling ability.
Summary of the invention
The object of the present invention is to provide a kind of comprehensive performace regulator for well cementing cement slurry and preparation method, this grout comprehensive performace regulator and other cement additive use jointly, can make a kind of complicated disposable cementing of the long interval isolation of well of the big temperature difference and the mortar architecture that need not adjust of being applicable to, this mortar architecture has low leak-off, rheological is good, transit time is short, interface cementing strength is high, and the good thixotropic property and the comprehensive anti-gas channeling performance of right angle multiviscosisty, can adapt to advantages such as bad ground cementing operation, overcome the deficiencies in the prior art.
A kind of comprehensive performace regulator for well cementing cement slurry is characterized in that, each component of this properties modifier and composed as follows:
Sepiolite fibre 2～5 weight %
Diatomite 4～10 weight %
Little silicon 25～30 weight %
Calcium bentonite 35～40 weight %
Pearlstone 16～22 weight %
CaO 8～15 weight %
KCl 2～5 weight %
The preparation method of this grout comprehensive performace regulator may further comprise the steps successively:
(1) compound concentration is that the sodium hydroxide solution of 15～20 weight %, sodium dodecyl sulfate solution and the concentration that concentration is 5～15 weight % are the sodium gluconate solution of 5～15 weight %, in sepiolite fibre: sodium hydroxide solution: sodium dodecyl sulfate solution: sodium gluconate solution=68～73 weight %: 7～12 weight %: 18～23 weight %: the ratio of 0.5～1 weight % was puddled in alkaline-resisting mixer 50～60 minutes under 50 ℃ of conditions, oven dry then, be reprocessed into 0.1～0.5cm, length-to-diameter ratio is 4～10 modified meerschaum fiber;
(2) calcium bentonite be soaked in water and stir 8 hours after, leach slurry and dry the milling powdered, make it cross 200 mesh sieves, particle diameter is less than 74 μ m;
(3) 200 mesh sieves are crossed at diatomite powder, SILICA FUME end, made particle diameter less than 74 μ m;
(4) perlite powder is crossed 80 mesh sieves, made particle diameter less than 178 μ m;
(5) with the modified meerschaum fiber: diatomite: little silicon: pearlstone: calcium bentonite: CaO: KCl=2～5 weight %: 4～10 weight %: 25～30 weight %: 35～40 weight %: 16～22 weight %: 8～15 weight %: the mixed of 2～5 weight % evenly promptly gets this grout comprehensive performace regulator.
Among this preparation method, at first be that compound concentration is that sodium hydroxide (NaOH) solution, the concentration of 15～20 weight % is the sodium lauryl sulphate (C of 5～15 weight %
12H
25SO
4Na) solution and concentration 5～15 weight % sodium gluconate solutions.Press sepiolite fibre: NaOH solution: C
12H
25SO
4Na solution: sodium gluconate solution=68～73 weight %: 7～12 weight %: 18～23 weight %: the ratio of 0.5～1 weight % was puddled in alkaline-resisting mixer 50～60 minutes under 50 ℃ of conditions, dry in 60 ℃～70 ℃ drying rooms then, make its water content be lower than 5%, be reprocessed into 0.1～0.5cm, length-to-diameter ratio is 4～10 modified meerschaum fiber, and the sepiolite content in the described sepiolite fibre is more than 90%.
Adopt calcium bentonite to put into tank, leach slurry and dry 30 minutes powdereds of milling, SiO in the described calcium bentonite with after the tap water immersion and stirring 8 hours
2Be 70～80 weight %, Al
2O
318～20 weight %, loss on ignition is less than 8.0 weight %.
Then with diatomite powder (SiO
286～95 weight %, Al
2O
34.0～9.7 weight %, Fe
2O
31.3～2.2 weight %, loss on ignition is less than 6.0 weight %), SILICA FUME end (true density 2.1～2.2g/cm
3, tap density 0.2～0.3g/cm
3, SiO
285～98 weight %) cross 200 mesh sieves respectively, make particle diameter less than 74 μ m.
(expansion multiple is greater than 20, SiO with perlite powder again
2Greater than 68.0 weight %, Fe
2O
3Less than 1.0 weight %, loss on ignition 3.0～9.0 weight %) cross 80 mesh sieves, make particle diameter less than 178 μ m.
At last with each component by the modified meerschaum fiber: diatomite: little silicon: pearlstone: wilkinite: CaO: KCl=2～5 weight %: 4～10 weight %: 25～30 weight %: 35～40 weight %: 16～22 weight %: 8～15 weight %: the ratio of 2～5 weight % mixes and promptly gets this grout comprehensive performace regulator.
This oil well cement paste comprehensive performace regulator and other cement water reducer, dispersion agent, retardant use jointly, can make the mortar architecture that is applicable to a cementing practice of the big temperature difference well of long interval isolation.Difference of the present invention just is: (1) research thinking: the cementing power that waits refinforced cement by adding modified meerschaum, wilkinite; Adjust the thickening time and the gain in strength performance of cement under the low temperature by the dosage that changes active material and activator CaO, KCl; Make full use of stability that active material improves the grout under different densities and the working conditions, anti-gas channeling performance etc.(2) engineering property: to the stable performance of big temperature difference well construction, having overcome long interval isolation upper and lower temperature difference brings the difficult problem of great variety for greatly the cement performance, make after this properties modifier activates at low temperatures grout at low temperatures performance and the performance under the medium temperature condition reach unanimity, the thickening time of 45 ℃ of same grout prescriptions and 90 ℃ of following cement and intensity differ and are no more than 20%.(3) property: with the cement slurry good stability of this properties modifier and the preparation of other cement additive, the thickening time is adjustable, has weak point transit time; The interface cementing strength height; The early strength development rapidly; Thixotropic property is good; The comprehensive anti-gas channeling performance of right angle multiviscosisty.
Compared with prior art, the present invention has following beneficial effect:
(1) thus this cement performance conditioning agent participates in main contribution product C-S-H that the hydration reaction of cement generates cement strength at low temperatures is being compensated the intensity of cement stone under the low temperature.It is different from general hardening accelerator to temperature non-selectivity and unfavorable to later strength development, this properties modifier at low temperatures short coagulating and under the high temperature blood coagulation enhancing effect not obvious, to the also contribution to some extent of growth of later strength;
(2) mortar architecture that this properties modifier 2.0%～4.0% of adding and other an amount of admixture can be prepared in grout has low leak-off, rheological is good, it is short to have a transit time, the interface cementing strength height, the comprehensive anti-gas channeling performance advantages of higher of good thixotropy and right angle multiviscosisty performance is arranged;
(3) production technique of this product is simple, and cost is low, does not produce waste water, waste residue etc., helps protecting environment;
(4) this product is easy to use, and the long CEMENTING SECTION construction of the big temperature difference need not be adjusted prescription, and a cementing can be successful, significantly reduced on-the-spot test number (TN) and dosing number of times, saved cost, improved the security of using.
Embodiment
Further specify the present invention below by embodiment.
Embodiment 1
Adopt Shanxi to produce sepiolite fibre, press sepiolite fibre: the NaOH solution of 20 weight %: the C of 10 weight %
12H
25SO
4Na solution: the ratio of sodium gluconate solution=100g of 10 weight %: 15g: 30g: 1g was puddled in alkaline-resisting mixer 60 minutes under 50 ℃ of conditions, dry in 70 ℃ of drying rooms then, make its water content be lower than 5%, be machined to 0.1～0.5cm through combing flower, length-to-diameter ratio is 4～10 modified meerschaum fiber.Factory produces faint yellow calcium bentonite with the Huaying hill wilkinite, after the tap water immersion and stirring 8 hours, leaches slurry and dries with 30 minutes powdereds of crushing mill milling; Diatomite powder, zunyi, guizhou ferro-silicon factory SILICA FUME end (all cross 200 mesh sieves, particle diameter is less than 74 μ m) in the Tengchong of Yunnan; High reactivity perlite powder (cross 80 mesh sieves, particle diameter is less than 178 μ m).By the modified meerschaum fiber: diatomite: little silicon: pearlstone: wilkinite: CaO: KCl=2: 5: 20: 15: 30: 8: 2 weight ratio mixes and promptly gets this grout comprehensive performace regulator.
Embodiment 2
Cement performance conditioning agent and other oil well cement additive that embodiment 1 is made are used, with this grout comprehensive performace regulator SD
612.5 weight % adds dispersion agent SXY 0.3 weight %, water retaining SD
18(Natvosol class) weight %, retardant SD
21(organic phosphine type retardant) 0.08 weight % and admixture SD
5224 hours intensity of grout that (Sichun Petroleum Administration Downhole Operation Company's production) 0.2 weight % makes is 22MPa, thickening time 317min, and the time of denseness from 40BC to 100BC is 4min only, and right angle multiviscosisty performance is obvious.Be used for 4100 meters of well depths, the disposable cementing practice success of the bad ground that bottom temperature is 95 ℃, cement returns to ground, and it is respond well to cement the well.
Embodiment 3
Sepiolite fibre is produced in Shanxi, press sepiolite fibre: the NaOH solution of 15 weight %: the C of 10 weight %
12H
25SO
4Na solution: the ratio of sodium gluconate solution=100g of 10 weight %: 15g: 30g: 1g was puddled in alkaline-resisting mixer 60 minutes under 50 ℃ of conditions, dry in 70 ℃ of drying rooms then, make its water content be lower than 5%, be machined to 0.1～0.5cm through combing flower, length-to-diameter ratio is 4～10 modified meerschaum fiber.Factory produces faint yellow calcium bentonite with the Huaying hill wilkinite, after the tap water immersion and stirring 8 hours, leaches slurry and dries with 30 minutes powdereds of crushing mill milling; Higher-grade diatomite, zunyi, guizhou ferro-silicon factory SILICA FUME end (all cross 200 mesh sieves, particle diameter is less than 74 μ m) in the Tengchong of Yunnan; The high reactivity perlite powder is crossed 80 mesh sieves, and particle diameter is less than 178 μ m.By the modified meerschaum fiber: diatomite: little silicon: pearlstone: wilkinite: CaO: KCl=2.5: 7: 25: 14: 28: 6: 2.5 weight ratio mixes and promptly gets this grout comprehensive performace regulator.
Embodiment 4
Cement performance conditioning agent and other oil well cement additive that embodiment 3 is made are used, with this grout comprehensive performace regulator SD
612.0 weight % adds dispersion agent SXY 1.0 weight %, water retaining SD
15(Natvosol class) 0.5 weight %, retardant SD
21(type of organophosphonic acides) 0.08 weight %, SD
PN(modified lignin resin) 0.227 weight % and admixture SD
520.3 weight %, SD
PM0.425 weight %, (SD
52, SD
PMBeing Sichun Petroleum Administration Downhole Operation Company produces) water cement ratio 0.33, the cement slurry density that makes is 2.16g/cm
3, cement slurry property is still stable behind the adding weighting agent, thickening time 340min.The time of denseness from 40BC to 100BC only is 5min, and the right angle multiviscosisty is obvious.Being used for 5500 meters temperature in wellbore range spans is 45 ℃～116 ℃ disposable cementing successes of complicated well that reservoir pressure is high, and grout returns to 1000 meters, and it is respond well to cement the well.
Claims (6)
1 one kinds of comprehensive performace regulator for well cementing cement slurry is characterized in that, each component of this properties modifier and composed as follows:
Modified meerschaum fiber 2～5 weight %
Diatomite 4～10 weight %
Little silicon 25～30 weight %
Calcium bentonite 35～40 weight %
Pearlstone 16～22 weight %
CaO 8～15 weight %
KCl 2～5 weight %,
Described modified meerschaum fiber is in sepiolite fibre: sodium hydroxide solution: sodium dodecyl sulfate solution: sodium gluconate solution=68～73 weight %: 7～12 weight %: 18～23 weight %: the ratio of 0.5～1 weight % was puddled in alkaline-resisting mixer 50～60 minutes under 50 ℃ of conditions, and the oven dry post-treatment forms.
The preparation method of 2 grout comprehensive performace regulators as claimed in claim 1 may further comprise the steps successively:
(1) compound concentration is that the sodium hydroxide solution of 15～20 weight %, sodium dodecyl sulfate solution and the concentration that concentration is 5～15 weight % are the sodium gluconate solution of 5～15 weight %, in sepiolite fibre: sodium hydroxide solution: sodium dodecyl sulfate solution: sodium gluconate solution=68～73 weight %: 7～12 weight %: 18～23 weight %: the ratio of 0.5～1 weight % was puddled in alkaline-resisting mixer 50～60 minutes under 50 ℃ of conditions, the oven dry post-treatment becomes 0.1～0.5cm, and length-to-diameter ratio is 4～10 modified meerschaum fiber;
(2) calcium bentonite be soaked in water and stir 8 hours after, leach slurry and dry the milling powdered, make it cross 200 mesh sieves, particle diameter is less than 74 μ m;
(3) 200 mesh sieves are crossed at diatomite powder, SILICA FUME end, made particle diameter less than 74 μ m;
(4) perlite powder is crossed 80 mesh sieves, made particle diameter less than 178 μ m;
(5) with the modified meerschaum fiber: diatomite: little silicon: pearlstone: calcium bentonite: CaO: KCl=2～5 weight %: 4～10 weight %: 25～30 weight %: 35～40 weight %: 16～22 weight %: 8～15 weight %: the mixed of 2～5 weight % evenly promptly gets this grout comprehensive performace regulator.
3 preparation methods as claimed in claim 2 is characterized in that, sepiolite content is more than 90% in the described sepiolite fibre of (1) step.
4 preparation methods as claimed in claim 2 is characterized in that, in the described calcium bentonite of (2) step, and SiO
2Be 70～80 weight %, Al
2O
3Be 18～20 weight %, its loss on ignition is less than 8.0 weight %.
5 preparation methods as claimed in claim 2 is characterized in that, in the described diatomite powder of (3) step, and SiO
286～95 weight %, Al
2O
34.0～9.7 weight %, Fe
2O
31.3～2.2 weight %, loss on ignition is less than 6.0 weight %, and its loss on ignition is less than 6.0 weight %, in the described SILICA FUME end, and true density 2.1～2.2g/cm
3, tap density 0.2～0.3g/cm
3, SiO
2Be 85～98 weight %.
6 preparation methods as claimed in claim 2 is characterized in that (4) goes on foot described perlite powder, and its expansion multiple is greater than 20, SiO
2Greater than 68.0 weight %, Fe
2O
3Less than 1.0 weight %, loss on ignition is 3.0～9.0 weight %.
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| CN107056158B (en) * | 2017-05-02 | 2020-11-24 | 四川宝鑫石油科技有限公司 | Plugging gas channeling prevention cement slurry for cementing easily-leaked slim hole or narrow-gap annular well |
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