CN102127402A - High-temperature-resistant clay-phase-free hypotonic reservoir stratum drilling fluid - Google Patents
High-temperature-resistant clay-phase-free hypotonic reservoir stratum drilling fluid Download PDFInfo
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Abstract
The invention discloses high-temperature-resistant clay-phase-free hypotonic reservoir stratum drilling fluid, which can be absorbed quickly, has high inhibiting performance and causes little damage, which comprises the following components: 100 parts of sea water or fresh water, 0.2 to 0.5 part of fluid loss additive, 2.0 to 4.0 parts of high-temperature fluid loss additive, 0.2 to 0.5 part of extracting and cutting agent, 0.5 to 1.5 parts of high-temperature stabilizer, 0.5 to 1 part of water blocking agent and 10 to 233 parts of organic salt. The invention has the following advantages: (1) the drilling fluid can resist a temperature as high as 180 DEG C; (2) the rheological behaviour and water loss property of the drilling fluid are easy to control; (3) the drilling fluid can be well mixed with the fluid in a reservoir stratum with small damage to the reservoir stratum and is particularly suitable for hypotonic oil and gas reservoir; and (4) the drilling fluid can be applied to drilling completion operation of reservoir stratum sections of deep and medium-deep wells, particularly hypotonic reservoir stratums.
Description
Technical field
The present invention relates to a kind of brill well completion working liquid in the drilling engineering, relate in particular to a kind of high temperature resistance, no clay phase low permeability reservoir drilling fluid.
Background technology
The needs of common no clay (no solid phase) drilling well when drilling fluid can not satisfy middle-deep well high temperature, and do not do research targetedly at low permeability reservoir.For middle-deep well hot hole section reservoir; in order to reduce injury to greatest extent to reservoir; usually applying pressure is controlled drilling technique; be used no clay phase drilling fluid system simultaneously; require drilling fluid system need satisfy the stability that when 180 ℃ temperature, keeps system, also will satisfy the reservoir protection needs of job safety needs and low permeability reservoirs simultaneously.
No clay phase drilling fluid system generally is meant argillaceous not, does not contain the drilling fluid system of insoluble solids high-density weighting material, its density is by the soluble salt adjustment, other salient featuress are safeguarded by adding polymkeric substance, are preferred temperature resistance polymkeric substance so improve the key of the heat-resisting property of system.Conventional no clay phase drilling fluid system temperature resistance generally all between 100-120 ℃, surpass 120 ℃ after general polymers all can high temperature degradation, thereby the stability of system is destroyed.But the domestic exploitation that research institution's success also arranged high temperature resistance do not have clay phase drilling fluid system, stability in the time of can keeping 180 ℃ of temperature as the no clay phase high temperature resistance system of Shengli Oil Field development, and application has obtained success at the scene, Petroleum Univ. and Changjiang University have also developed the no clay drilling fluid system mutually that can resist 150 ℃, these several individual system all are by preferred high-temperature stabiliser, make up with other polymkeric substance and formate are common.
The beginning of the nineties at the end of the eighties in last century, Shell Co. Ltd develops out the drilling workers system, and be applied to the drilling and well completion operation under the deep-well hot environment, and rig-site utilization has also obtained effect preferably, the formate system has good restraining and heat-resisting property, good with the polymkeric substance compatibleness, and can improve the heat-resisting property of polymkeric substance to a certain extent, so do not have at high temperature resistance and to have selected sodium formiate in the clay phase system as high-density weighting material and inhibitor, add Repone K simultaneously, utilized K+ to come the inhibition of further raising system.
Low permeability reservoirs has higher argillaceous cement content, water saturation, capillary pressure, water sensitivity, and pore throat is tiny, poor permeability, serious heterogeneity, hydrocarbon flow dynamic resistance greatly, often with characteristics such as natural fractures, very easily reservoir produces water-sensitive and effective stress changes pollution damages such as causing stress sensitive because of outside fluid is invaded in the drilling and well completion process, and in a single day suffer damage, will be difficult to recover.At the characteristics of low permeability reservoirs, improve the drilling fluid filtrate liquid phase viscosity by adding organic salt, slow down the intrusion of filtrate to reservoir, in system, introduce polyamine in addition and improve the drilling fluid inhibition, and reduce the interfacial tension of filtrate, anti-sealing lock effect.
Summary of the invention
A kind of fast absorption provided by the invention, strong high temperature resistance, the no clay phase low permeability reservoir drilling fluid that suppresses, hangs down injury comprise following component:
100 parts of seawater or fresh water
0.2～0.5 part of fluid loss agent
2.0～4.0 parts of high temperature fluid loss agents
Carry and cut 0.2～0.5 part of agent
0.5～1.5 part of high-temperature stabiliser
0.5～1 part of Waterproof lock agent
10～233 parts of organic salts.
Preferably, described fluid loss agent adopts PF-PAC (Polyanionic Cellulose).
Preferably, described high temperature fluid loss agent adopts PF-FLO T (high temperature resistance treated starch) and/or PF-SMP I (sulfonated-pheno-formoldehyde resin).
Preferably, described carrying cut agent employing PF-XC H (biological polymer).
Preferably, described high-temperature stabiliser adopts PF-HJW (high temperature resistance stablizer).
Preferably, PF-UHIB (polyamine) is adopted in described Waterproof lock agent.
Preferably, described organic salt adopts sodium formiate or potassium formiate.
Make a detailed description with regard to each component below:
(1) organic salt
Organic salt is meant sodium formiate or potassium formiate, is used to improve collaborative inhibition, the raising drilling fluid temperature resistance ability of drilling fluid and improves drilling fluid density.
(2) fluid loss agent
The fine fluid loss agent can form fast low permeability, pliable and tough, thin and fine and close filter cake on the borehole wall, the filter loss of drilling fluid is reduced to minimum, the infringement that minimizing causes reservoir.The water retaining that is used for body series is PF-PAC, and the PF-PAC main component is a Polyanionic Cellulose.
(3) heat resisting fluid loss reducing agent
Heat resisting fluid loss reducing agent comprises PF-FLO T and PF-SMP I, it mainly is the dehydration when reducing wellbore fluid and tying up to high temperature, PF-SMP I main component is a sulfonated-pheno-formoldehyde resin, the sulfonated-pheno-formoldehyde resin molecular backbone is made up of methylene bridge and phenyl ring, a large amount of sulfonic groups have been introduced again, so thermostability is strong, can resist 180～200 ℃ high temperature.Sulfonated-pheno-formoldehyde resin also has certain anticalcium ability when falling dehydration, and can improve the oilness of filter cake, and the borehole wall is also had certain stabilization.PF-FLO T main component is the high temperature resistance treated starch.
(4) carry and cut agent
Carrying and cutting agent PF-XC H is biological polymer, is a kind ofly to act on carbohydrate and the polymer chain polysaccharide polymer that generates by the xanthan bacillus, is called xanthan gum again.It can improve viscosity, yield value and shear force in fresh water, salty mud, have good shear thinning property, shearing dilution.The amount (0.2%～0.3%) that adds seldom can produce higher viscosity, and has the leak-off effect of falling concurrently.Its another distinguishing feature is to have good shear thinning performance, can improve flow pattern (promptly increase ratio of dynamic shear force/yield value to plastic viscosity, reduce the n value) effectively.
(5) high-temperature stabiliser
High-temperature stabiliser PF-HJW (Hebei China fortune achievements of a ruler chemical industry company limited system), mainly by being to utilize natural materialss such as vegetable jelly, Mierocrystalline cellulose to be polymerized through special process and acrylic acid, outward appearance is white or pale yellow powder shape particle.Can effectively reduce drilling fluid filtration, anti-calcium and anti-salt magnesium ability is strong, and temperature resistance can reach 180 ℃, and tackify not substantially in drilling fluid is applicable to fresh water, compound salt solution and saturated salt-water drilling fluid system.
(6) Waterproof lock agent
Waterproof lock agent PF-UHIB (COSL Chemicals's system) main component is a polyamine, by the design of group analysis and multipath, synthetic being prepared from, taken into full account the useful free amine distribution characteristics of polyamine, effectively guarantee the strong rejection capability of polyamino compound, made polyamine in common seawater, just can reach higher effective inhibition and square effect.Can prevent the hydration swelling of clay effectively, reduce filtrate surface tension force, the protection hydrocarbon zone.
The present invention has following advantage:
(1) the drilling fluid temperature resistance can reach 180 ℃;
(2) rheological of drilling fluid and dehydration performance are easy to control;
(3) compatibleness with reservoir fluid is good, and reservoir damage is little, is particularly suited for low permeability reservoirs and uses;
(4) drilling fluid range of application of the present invention:
Deep-well and middle-deep well reservoir section (reservoir temperature is between 120 ℃-180 ℃) are bored well-completion practice, have more advantage at low permeability reservoir.
Description of drawings
Fig. 1 is well depth-rheological property curve.
Embodiment
Embodiment 1
Preparation density is 1.2g/cm
3Fast absorption, strong suppress, the high-efficiency water-base drilling fluid of low injury: get 400 milliliters of seawater with graduated cylinder and place the slurry cup, under the rotating speed of 12000r/min, add 40g potassium formiate, 1.6g PF-PAC, 8.0gPF-SMP I, 8.0gPF-FLO T, 1.2g PF-XC H, 6.0gPF-HJW, 4.0g PF-UHIB while stirring, high-speed stirring 20 minutes.
1, the drilling fluid traditional performance is estimated
The sample of example 1 was rolled 16 hours 180 ℃ of following heat, measure heat then and roll HTHP filter loss under the rheological of drilling fluid under the normal temperature of back, API filtration and 150 ℃, the 3.5MPa, the results are shown in Table 1.
Table 1 high temperature resistance does not have the temperature resistance evaluating data of clay phase drilling fluid system
As shown in Table 1, API dehydration temperature influence is little though the viscosity of this system descends to some extent, all keeps lower level before and after heat is rolled.
2, to the drilling fluids at high temperature estimation of stability
Put into heat according to 3 samples of example 1 recipe configuration and roll stove, heat is rolled under 180 ℃ of environment, 24 hours at interval, took out its performance of sample measurement in 48 hours and 72 hours respectively, the results are shown in following table 2, this system can 180 ℃ of conditions under, the steady state that keeps for some time, but, have the trend of broken glue gradually, but in 72 hours along with the prolongation viscosity of time can reduce gradually, the API dehydration changes little, generally speaking, this system has good high-temperature stability, the results are shown in Table 2.
Table 2 high-temperature circulation test data
3, the drilling fluid rejection is estimated
The table 3 rolling rate of recovery and linear expansion rate experiment
Experiment condition: 180 ℃ of aging 16Hr
According to recipe configuration drilling fluid sample, carried out the test of the rolling rate of recovery and linear expansion rate, the rolling rate of recovery and linear expansion rate with seawater under the identical condition compare, the results are shown in Table 3, this system has significantly improved the rolling rate of recovery of drilling cuttings, and have lower linear expansion rate, this explanation system has good inhibition mud stone expansible ability.
The oil layer protection effect assessment of 4 systems
Use DSA10 surface and interface tensiometer, as shown in table 4 by hanging the interfacial tension between sessile drop method measurement kerosene-filtrate, the indoor aging rear filtrate of this system and the interfacial tension of kerosene under 30 ℃, measured:
Table 4 interfacial tension experimental data
Choose No. 7 rock samples of BZ13-1-1 well (3993.03m), artificial rock sample and No. 6 rock samples of BZ13-1-1 well (3992.99m) again, example 1 is estimated its reservoir protection performance with reference to China National Petroleum industry standard SY/T6540-2002 " damage of drilling fluid and completion fluid oil reservoir indoor evaluation method ".Concrete steps are: find time 3 synthetic cores saturated, measure rock core permeability to oil Ko, carry out reverse rock core with example 1 high-efficiency water-base drilling fluid then and dynamically pollute (condition: 80 ℃ of temperature, pressure 3.5Mpa, 2 hours time), measure at last and pollute back rock core permeability to oil Kd, and calculate core permeability recovery value Kd/Ko, test-results is as shown in table 5:
Table 5 permeability resume figure experimental data
The data of table 4 and table 5 illustrate that then the interfacial tension of the filtrate of example 1 is in very low level, and the injury of reservoir is remained on lower level, have good oil layer protection effect.
High temperature resistance does not have clay phase wellbore fluid and ties up to BZ13-1 oil field well 6 " well section first Application, and obtained success, this well finishing drilling degree of depth is 4170 meters.Do not have clay phase drilling fluid 260 sides according to following recipe configuration high temperature resistance before spudding in, on-the-spot prescription is as follows:
100ml seawater+5g KCl+10g sodium formiate+0.2g PF-XC H+0.3gPF-PAC+2.0gPF-SMP I+0.5gPF-UHIB+0.5g PF-HJW.
Use the seawater drilling out, enter new stratum and replace into mud for preceding 10 meters, begin to creep into after setting up circulation, during measure mud viscosity and maintain 45-50 second, the normal temperature and pressure dehydration is 0ml, density is at 1.14g/cm
3About, to creep into to 4120 meters, overflow appears in well head, adopts slip-stick artist's weighting procedure behind the closing well, and drilling fluid density is brought up to 1.24g/cm
3, kill-job success.Kill-job finishes the back and recovers to creep into, and adjusts mud property, and density is at 1.23-1.25g/cm
3Between, viscosity maintained about 50 seconds, and the API dehydration is controlled between the 3.5-3.8ml, and HTHP FL (150 ℃) is 12ml, and every rheological property is seen Fig. 1.
After the normal finishing drilling, carry out open hole test, test result shows that oil yield surpassed for 500 side/days, gas output was 220,000 side/days, by above data as can be seen, high temperature does not have clay phase drilling fluid system and has high-temperature stability preferably, remains rheological property comparatively stably in the drilling process, and to the damage Control of reservoir at lower level.
Being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention therefore, all any modifications of being done within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a high temperature resistance, no clay phase low permeability reservoir drilling fluid comprise following component:
100 parts of seawater or fresh water
0.2～0.5 part of fluid loss agent
2.0～4.0 parts of high temperature fluid loss agents
Carry and cut 0.2～0.5 part of agent
0.5～1.5 part of high-temperature stabiliser
0.5～1 part of Waterproof lock agent
10～233 parts of organic salts.
2. drilling fluid as claimed in claim 1 is characterized in that, described fluid loss agent adopts PF-PAC.
3. drilling fluid as claimed in claim 1 is characterized in that, described high temperature fluid loss agent adopts PF-FLO T and/or PF-SMP I.
4. drilling fluid as claimed in claim 1 is characterized in that, described carrying cut agent employing PF-XC H.
5. drilling fluid as claimed in claim 1 is characterized in that, described high-temperature stabiliser adopts PF-HJW.
6. drilling fluid as claimed in claim 1 is characterized in that, PF-UHIB is adopted in described Waterproof lock agent.
7. drilling fluid as claimed in claim 1 is characterized in that, described organic salt adopts sodium formiate or potassium formiate.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102851009A (en) * | 2012-09-27 | 2013-01-02 | 北京奥凯立科技发展股份有限公司 | Organic salt high-density drilling fluid |
| CN102899007A (en) * | 2012-10-31 | 2013-01-30 | 中国石油大学(华东) | High-temperature resistant viscosity reducer for drilling fluids and preparation method for viscosity reducer |
| CN103013467A (en) * | 2012-12-22 | 2013-04-03 | 中国石油大学(华东) | Nonclay one-way plugging drilling fluid |
| CN103074049A (en) * | 2013-01-21 | 2013-05-01 | 西南石油大学 | Fracturing fluid prepared by recovery waste water of crude oil and preparation method of fracturing fluid |
| CN103194189A (en) * | 2013-04-11 | 2013-07-10 | 中国石油大学(华东) | Drilling fluid capable of protecting coal bed methane reservoir |
| CN104109510A (en) * | 2013-10-18 | 2014-10-22 | 中国石油化工股份有限公司 | Solid-free slurry-replacing well completion protective fluid and preparation method thereof |
| CN105295865A (en) * | 2015-09-15 | 2016-02-03 | 西南石油大学 | Soilless potassium formate water-based drilling fluid for drilling shale |
| CN105647498A (en) * | 2015-12-31 | 2016-06-08 | 中国石油天然气股份有限公司 | Waterproof lock workover fluid and manufacturing method thereof |
| CN106433581A (en) * | 2016-09-22 | 2017-02-22 | 中国海洋石油总公司 | Clay-free high temperature resistance reservoir drilling fluid and preparation method thereof |
| CN111894520A (en) * | 2019-05-06 | 2020-11-06 | 中石化石油工程技术服务有限公司 | Method for regulating temperature of drilling fluid based on paraffin material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892036A (en) * | 2010-08-09 | 2010-11-24 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Process for preparing drilling fluid for preventing polycrystalline diamond compact (PDC) bit balling |
-
2010
- 2010-12-15 CN CN2010105892045A patent/CN102127402A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892036A (en) * | 2010-08-09 | 2010-11-24 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Process for preparing drilling fluid for preventing polycrystalline diamond compact (PDC) bit balling |
Non-Patent Citations (4)
| Title |
|---|
| 《天津科技》 20091025 苗海龙等 "抗高温无固相钻井液研究" 22-23 1-7 , 第5期 * |
| 《天然气工业》 20081231 许明标等 "一种新型高性能聚胺聚合物钻井液的研制" 51-53 1-5 第28卷, 第12期 * |
| 苗海龙等: ""抗高温无固相钻井液研究"", 《天津科技》 * |
| 许明标等: ""一种新型高性能聚胺聚合物钻井液的研制"", 《天然气工业》 * |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102851009A (en) * | 2012-09-27 | 2013-01-02 | 北京奥凯立科技发展股份有限公司 | Organic salt high-density drilling fluid |
| CN102851009B (en) * | 2012-09-27 | 2015-05-20 | 北京奥凯立科技发展股份有限公司 | Organic salt high-density drilling fluid |
| CN102899007A (en) * | 2012-10-31 | 2013-01-30 | 中国石油大学(华东) | High-temperature resistant viscosity reducer for drilling fluids and preparation method for viscosity reducer |
| CN102899007B (en) * | 2012-10-31 | 2013-11-06 | 中国石油大学(华东) | High-temperature resistant viscosity reducer for drilling fluids and preparation method for viscosity reducer |
| CN103013467A (en) * | 2012-12-22 | 2013-04-03 | 中国石油大学(华东) | Nonclay one-way plugging drilling fluid |
| CN103074049B (en) * | 2013-01-21 | 2015-04-08 | 西南石油大学 | Fracturing fluid prepared by recovery waste water of crude oil and preparation method of fracturing fluid |
| CN103074049A (en) * | 2013-01-21 | 2013-05-01 | 西南石油大学 | Fracturing fluid prepared by recovery waste water of crude oil and preparation method of fracturing fluid |
| CN103194189A (en) * | 2013-04-11 | 2013-07-10 | 中国石油大学(华东) | Drilling fluid capable of protecting coal bed methane reservoir |
| CN103194189B (en) * | 2013-04-11 | 2016-08-03 | 中国石油大学(华东) | A kind of drilling fluid protecting coalbed methane reservoir |
| CN104109510A (en) * | 2013-10-18 | 2014-10-22 | 中国石油化工股份有限公司 | Solid-free slurry-replacing well completion protective fluid and preparation method thereof |
| CN104109510B (en) * | 2013-10-18 | 2017-07-14 | 中国石油化工股份有限公司 | A kind of Solid Free is for slurry completion protection liquid and preparation method thereof |
| CN105295865A (en) * | 2015-09-15 | 2016-02-03 | 西南石油大学 | Soilless potassium formate water-based drilling fluid for drilling shale |
| CN105647498A (en) * | 2015-12-31 | 2016-06-08 | 中国石油天然气股份有限公司 | Waterproof lock workover fluid and manufacturing method thereof |
| CN105647498B (en) * | 2015-12-31 | 2018-12-25 | 中国石油天然气股份有限公司 | Waterproof lock workover fluid and manufacturing method thereof |
| CN106433581A (en) * | 2016-09-22 | 2017-02-22 | 中国海洋石油总公司 | Clay-free high temperature resistance reservoir drilling fluid and preparation method thereof |
| CN106433581B (en) * | 2016-09-22 | 2019-04-26 | 中国海洋石油集团有限公司 | It is a kind of without soil reservoir drilling fluid mutually resistant to high temperatures and preparation method thereof |
| CN111894520A (en) * | 2019-05-06 | 2020-11-06 | 中石化石油工程技术服务有限公司 | Method for regulating temperature of drilling fluid based on paraffin material |
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Application publication date: 20110720 |