CN106018176A - Method for evaluating rheological property of water-based drilling fluid - Google Patents
Method for evaluating rheological property of water-based drilling fluid Download PDFInfo
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- CN106018176A CN106018176A CN201610531165.0A CN201610531165A CN106018176A CN 106018176 A CN106018176 A CN 106018176A CN 201610531165 A CN201610531165 A CN 201610531165A CN 106018176 A CN106018176 A CN 106018176A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
Abstract
The invention discloses a method for evaluating the rheological property of water-based drilling fluid. The method comprises the following steps that 1, water-based drilling fluid test slurry for shale gas is prepared for use; 2, the apparent viscosity of the drilling fluid test slurry shown every time the temperature is increased by 10 DEG C is measured through a 130-77 high-temperature high-pressure rheometer; 3, the change curve of the apparent viscosity along with the temperature is drawn; 4, a0, a1 and a2 in a fitted equation are calculated according to a normal equation system fitted through a least square method polynomial, and the fitted equation is obtained; 5, the fitting effect of a linear regression equation is judged according to the regression sum of squares, the residual sum of squares and a correlation coefficient R. According to the method, the changes of the apparent viscosity of the drilling fluid for the shale gas under different temperature conditions can be well described to evaluate the rheological property of the drilling fluid, and high pertinency and good regression are achieved.
Description
Technical field
The present invention relates to oil and gas well drilling technical field, specifically relate to the evaluation methodology of a kind of water-base drilling fluid rheological characteristic.
Background technology
At present, the apparent viscosity of common drilling fluid, plastic viscosity, yield value, gel strength isoparametric formulations are led in drilling fluid rheology evaluation, operation use rotating cylinder viscometer ZNN-D6 carry out conversion after six speed measure under the conditions of constant drilling fluid outlet temperature (general 40-50 DEG C) and obtain.
Such as author is the periodical literature that Zhang Xiaomeng, Liu Chengwen, Li Zhaomin etc. have delivered entitled " the drilling fluid rheology pattern of a kind of improvement and evaluation " on the periodical printing entitled " fault-blcok oil-gas field ", it is to the effect that: on the basis of the reheology model that brief review is the most the more commonly used, the reheology model proposing Lin Baiheng is improved, and has obtained a kind of four new parameter reheology models.Utilize the mathematical method of regression analysis, select water base, oil base, high density, polymer and the different types of drilling fluid experimental data of formates 5 kinds, simulate the rheological parameter of different reheology model, and fitting result is contrasted.Result shows: the new reheology model that improvement obtains is compared with Ben-Hur, power law, H-B and Lin Baiheng pattern, and fitting effect is best, can describe the rheological characteristic of variety classes drilling fluid well.
But, temperature and pressure at the bottom of shale gas Horizontal Well is higher, and drilling fluid density is often at 2.00 g/cm3Above, have that solid concentration is big, solid phase particles dispersion high, free water content is on the low side, drilling fine invade after the not feature such as easy-clear, use existing mensuration mode can not simulate drilling fluid rheological parameter under pit shaft different depth, different temperatures, different pressures well, cause the result that can not preferably serve actual production.
Summary of the invention
It is contemplated that the shortcoming of action and rheological parameter of mud evaluation methodology under different temperatures (particularly well temperature surpasses 100 DEG C), different pressures can not be carried out for rotating cylinder viscometer ZNN-D6, propose the evaluation methodology of a kind of new water-base drilling fluid rheological characteristic, this method can preferably be depicted the change of apparent viscosity under condition of different temperatures of shale gas drilling fluid, with the rheological characteristic of this appraisal drilling liquid, its for strong, regression good.
The present invention realizes by using following technical proposals:
The evaluation methodology of a kind of water-base drilling fluid rheological characteristic, it is characterised in that step is as follows:
A, preparation density are 2.0g/cm3Above shale gas water-base drilling fluid test slurry, under the conditions of 120 DEG C-140 DEG C after heat rolling 12-20h, stirs standby；
B, use 130-77 type HTHP rheometer are at pressure 50-70MPa, shear rate 300 s-1-400s-1, measuring drilling fluid test slurry under conditions of temperature 60 C-130 DEG C often increases the apparent viscosity at 10 DEG C with temperature；
C, drafting apparent viscosity variation with temperature curve；
D, the scatterplot being varied with temperature curve by apparent viscosity find out that fit equation is quadratic polynomial y=a0+a1x+a2x2, use the normal equation system of method of least square fitting of a polynomial to calculate a in fit equation0、a1、a2, try to achieve fit equation；
The size of e, use regression sum of square, residual sum of squares (RSS) and coefficient R judges the fitting effect of fit equation.
On the basis of above-mentioned steps, in step e after, present invention f the most in steps, use fit equation to go out the apparent viscosity of drilling fluid, guide field actual production according to the temperature estimation of drilling fluid difference well depth.
Described a step is more optimizedly: preparation density is 2.2g/cm3Shale gas water-base drilling fluid test slurry, under the conditions of 130 DEG C after heat rolling 16h, standby 11000 revs/min of lower high-speed stirred 30 minutes.
Described b step is more optimizedly: use 130-77 type HTHP rheometer in pressure 60MPa, shear rate 350s-1, measuring drilling fluid test slurry under conditions of temperature 60 C-130 DEG C often increases the apparent viscosity at 10 DEG C with temperature.
Residing step c is more particularly: use discrete test to draw temperature and apparent viscosity change curve.
Compared with prior art, what the present invention was reached has the beneficial effect that:
1, the evaluation methodology described in a-e of the present invention is used, it is possible to evaluate the drilling fluid rheology under different temperatures intuitively.
2, in the present invention, Field Force can according to fit equation, estimate drilling fluid pit shaft different depth, at a temperature of apparent viscosity value, judge drilling fluid whether thickening, dispersion whereby, its for strong, regression good；The method and formula theory is clear and easy to understand, it is simple to calculate, can be well in situ of drilling well popularization and application.
3, the shale gas water-base drilling fluid rheological characteristic evaluation methodology that the present invention is formed, be conducive to instructing drilling fluid to safeguard at the property of drilling fluid of deep-well, horizontal well, extended reach well, avoid drilling complexity accident to occur in time, shale gas exploration and development is had wide application and promotion prospect.
Accompanying drawing explanation
Below in conjunction with specification drawings and specific embodiments, the present invention is described in further detail, wherein:
Fig. 1 is the temperature that draws of discrete test and apparent viscosity change curve；
Fig. 2 is a that the normal equation system according to method of least square fitting of a polynomial calculates in fit equation0、a1、a2, try to achieve the schematic diagram of fit equation.
Detailed description of the invention
Embodiment 1
As a better embodiment of the present invention, it discloses the evaluation methodology of a kind of water-base drilling fluid rheological characteristic, its step is as follows:
A, preparation density are 2.0g/cm3Above shale gas water-base drilling fluid test slurry, under the conditions of 140 DEG C after heat rolling 20h, stirs standby；Water-base drilling fluid can select any one the most common water-base drilling fluid；
B, use 130-77 type HTHP rheometer are at pressure 70MPa, shear rate 300 s-1s-1, measuring drilling fluid test slurry under conditions of temperature 60 C-130 DEG C often increases the apparent viscosity at 10 DEG C with temperature；
C, drafting apparent viscosity variation with temperature curve；
D, the scatterplot being varied with temperature curve by apparent viscosity find out that fit equation is quadratic polynomial y=a0+a1x+a2x2, use the normal equation system of method of least square fitting of a polynomial to calculate a in fit equation0、a1、a2, try to achieve fit equation；
The size of e, use regression sum of square, residual sum of squares (RSS) and coefficient R judges the fitting effect of fit equation.
130-77 type HTHP rheometer is that OFI company of the U.S. produces.This instrument maximum operating temperature 260 DEG C, maximum working pressure 207MPa, shear rate 0 ~ 1700s-1Between adjustable.
Embodiment 2
As the preferred forms of the present invention, it discloses the evaluation methodology of a kind of water-base drilling fluid rheological characteristic, its step is as follows:
A, preparation density are 2.2g/cm3Shale gas water-base drilling fluid test slurry, under the conditions of 130 DEG C after heat rolling 16h, standby 11000 revs/min of lower high-speed stirred 30 minutes；
B, use 130-77 type HTHP rheometer are in pressure 60MPa, shear rate 350s-1, measuring drilling fluid test slurry under conditions of temperature 60 C-130 DEG C often increases the apparent viscosity at 10 DEG C with temperature；
C, employing discrete test draw temperature and apparent viscosity change curve；As shown in Figure 1；
D, the scatterplot being varied with temperature curve by apparent viscosity find out that fit equation is quadratic polynomial y=a0+a1x+a2x2, use the normal equation system of method of least square fitting of a polynomial to calculate a in fit equation0、a1、a2, try to achieve fit equation y=431-7.382x+0.0368x2；
The size of e, use regression sum of square, residual sum of squares (RSS) and coefficient R judges the fitting effect of fit equation；
R2=0.9649, thus draw R=0.98
F, use fit equation go out the apparent viscosity of drilling fluid, guide field actual production according to the temperature estimation of drilling fluid difference well depth.
Regression model correlation coefficient is higher, and the shale gas high performance water-based drilling fluid apparent viscosity calculated with model compares with measured value, maximum error value 10.8%, two kinds of goodness of fit height.
In this example, preferably water-base drilling fluid is to be prepared from by ratio of weight and the number of copies by clear water, inhibitor, fluid loss additive, sealing agent, pH adjusting agent, heavy weight additive, clear water: inhibitor: fluid loss additive: sealing agent: pH adjusting agent: heavy weight additive=100:20～25:15～20:1～2:0.5～1:35～200.
Described inhibitor be the polyacrylic acid potassium KPAM by 0.2～1 weight portion, 0.5～2 weight portion polyanion cellulose PAC-LV, 0.3～2 weight portion high solid phase drilling fluid inhibitor organic sial QLA, 10～20 weight portion potassium formate, 3～8 the potassium chloride of weight portion mix.
Described fluid loss additive be the sulfonated phenolic resin SMP by 2～4 weight portions, 1～2 the humic acid propane sulfonic acid amide multiple copolymer RSTF of weight portion mix.
Described sealing agent is shale control agent SOLTEX；PH adjusting agent is quick lime；Heavy weight additive is barite.
Claims (5)
1. the evaluation methodology of a water-base drilling fluid rheological characteristic, it is characterised in that step is as follows:
A, preparation density are 2.0g/cm3Above shale gas water-base drilling fluid test slurry, under the conditions of 120 DEG C-140 DEG C after heat rolling 12-20h, stirs standby；
B, use 130-77 type HTHP rheometer are at pressure 50-70MPa, shear rate 300 s-1-400s-1, measuring drilling fluid test slurry under conditions of temperature 60 C-130 DEG C often increases the apparent viscosity at 10 DEG C with temperature；
C, drafting apparent viscosity variation with temperature curve；
D, the scatterplot being varied with temperature curve by apparent viscosity find out that fit equation is quadratic polynomial y=a0+a1x+a2x2, use the normal equation system of method of least square fitting of a polynomial to calculate a in fit equation0、a1、a2, try to achieve fit equation；
The size of e, use regression sum of square, residual sum of squares (RSS) and coefficient R judges the fitting effect of fit equation.
The evaluation methodology of a kind of water-base drilling fluid rheological characteristic the most according to claim 1, it is characterized in that: on the basis of above-mentioned steps, after in step e, present invention f the most in steps, use fit equation go out the apparent viscosity of drilling fluid, guide field actual production according to the temperature estimation of drilling fluid difference well depth.
The evaluation methodology of a kind of water-base drilling fluid rheological characteristic the most according to claim 1, it is characterised in that: described a step is more optimizedly: preparation density is 2.2g/cm3Shale gas water-base drilling fluid test slurry, under the conditions of 130 DEG C after heat rolling 16h, standby 11000 revs/min of lower high-speed stirred 30 minutes.
The evaluation methodology of a kind of water-base drilling fluid rheological characteristic the most according to claim 1, it is characterised in that: described b step is more optimizedly: use 130-77 type HTHP rheometer in pressure 60MPa, shear rate 350s-1, measuring drilling fluid test slurry under conditions of temperature 60 C-130 DEG C often increases the apparent viscosity at 10 DEG C with temperature.
The evaluation methodology of a kind of water-base drilling fluid rheological characteristic the most according to claim 1, it is characterised in that: residing step c more particularly: use discrete test to draw temperature and apparent viscosity change curve.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107557085A (en) * | 2017-09-04 | 2018-01-09 | 河南省科学院能源研究所有限公司 | A kind of kinematic viscosity test of biomass-based liquid fuel and Forecasting Methodology |
| CN112082906A (en) * | 2019-06-13 | 2020-12-15 | 中石化石油工程技术服务有限公司 | Temperature-controlled drilling fluid rheological property automatic on-line measuring device |
| CN112198092A (en) * | 2020-08-24 | 2021-01-08 | 浙江南都电源动力股份有限公司 | Method for testing stability of battery slurry |
| CN113008734A (en) * | 2021-02-19 | 2021-06-22 | 延安能坤油气工程技术服务有限公司 | Intelligent detection method for drilling fluid |
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| US20070197403A1 (en) * | 2006-02-22 | 2007-08-23 | David Dino | Organophilic clay additives and oil well drilling fluids with less temperature dependent rheological properties |
| CN104710967A (en) * | 2013-12-17 | 2015-06-17 | 中国石油化工集团公司 | Self-plugging releasing temperature resistant temporary plugging agent used for water-based drilling fluid and preparation method thereof |
| CN104893688A (en) * | 2015-03-25 | 2015-09-09 | 新疆疆润油田钻采助剂有限责任公司 | Thermostable lubricant for drilling fluid |
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Cited By (4)
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| CN107557085A (en) * | 2017-09-04 | 2018-01-09 | 河南省科学院能源研究所有限公司 | A kind of kinematic viscosity test of biomass-based liquid fuel and Forecasting Methodology |
| CN112082906A (en) * | 2019-06-13 | 2020-12-15 | 中石化石油工程技术服务有限公司 | Temperature-controlled drilling fluid rheological property automatic on-line measuring device |
| CN112198092A (en) * | 2020-08-24 | 2021-01-08 | 浙江南都电源动力股份有限公司 | Method for testing stability of battery slurry |
| CN113008734A (en) * | 2021-02-19 | 2021-06-22 | 延安能坤油气工程技术服务有限公司 | Intelligent detection method for drilling fluid |
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