CN112903907A - Evaluation method for inhibiting hydration capacity of shale by water-based drilling fluid - Google Patents
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- 238000005553 drilling Methods 0.000 title claims abstract description 130
- 239000012530 fluid Substances 0.000 title claims abstract description 119
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 230000036571 hydration Effects 0.000 title claims abstract description 97
- 238000006703 hydration reaction Methods 0.000 title claims abstract description 97
- 238000011156 evaluation Methods 0.000 title claims abstract description 35
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 17
- 230000005764 inhibitory process Effects 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000013049 sediment Substances 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000002474 experimental method Methods 0.000 claims description 13
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 12
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 12
- 239000005995 Aluminium silicate Substances 0.000 claims description 3
- 235000012211 aluminium silicate Nutrition 0.000 claims description 3
- 229910052900 illite Inorganic materials 0.000 claims description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 3
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 claims description 3
- 239000013078 crystal Substances 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 23
- 239000004927 clay Substances 0.000 description 14
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 5
- 229910052740 iodine Inorganic materials 0.000 description 5
- 239000011630 iodine Substances 0.000 description 5
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000012854 evaluation process Methods 0.000 description 2
- 230000000887 hydrating effect Effects 0.000 description 2
- 230000002687 intercalation Effects 0.000 description 2
- 238000009830 intercalation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 241001411320 Eriogonum inflatum Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- Medicinal Chemistry (AREA)
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Abstract
The invention provides an evaluation method for the hydration inhibition capability of water-based drilling fluid on shale, belonging to the field of shale gas development. The method comprises the following steps: providing a dried shale sample, and testing the spacing d between crystal lattice layers001(ii) a Adding a quantitative dry shale sample and the water-based drilling fluid to be evaluated into a reaction bottle, stirring at a set temperature, and centrifuging; collecting the hydration sediment of the shale sample, and testing the spacing d between the crystal layers001(ii) a Obtaining the difference value delta d between the two001Comparing the water-based drilling fluid with an evaluation standard, and judging the strength of the water-based drilling fluid to be evaluated for inhibiting the shale hydration capability; the evaluation criteria are as follows: 0.22 ≧ Δ d001More than 0, strong shale hydration inhibition capacity; 0.5 ≥ Δ d001More than 0.22, the shale hydration inhibition capacity is stronger; 0.7 ≧ Δ d001More than 0.5, the shale hydration inhibition capacity is weaker; 1 ≧ Δ d001And the shale hydration inhibition capacity is weak when the content is more than 0.7.
Description
Technical Field
The invention relates to the field of shale gas development, in particular to an evaluation method for the inhibition capacity of a water-based drilling fluid on shale hydration.
Background
Shale is a rock formed by clay deposition under pressure and temperature mixed with quartz, debris of feldspar and other chemicals, and has large specific surface, small pores, complex structure and easy water absorption and expansion. When the water-based drilling fluid drills a shale stratum, the shale can be hydrated and expanded in the water-based drilling fluid, so that the shale stratum becomes one of the reasons that the stability of a well wall of the shale stratum is lost, the shale stratum is cracked and peeled off, and even the well wall is collapsed. In order to prevent collapse caused by instability of a well wall drilling mud shale stratum, the water-based drilling fluid has strong inhibition capacity on hydration expansion of the mud shale.
At present, the inhibition capacity of the water-based drilling fluid on shale hydration is evaluated by a laser particle size method.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
the test result of the laser particle size method is greatly influenced by the stirring time and the stirring speed, and the accuracy of the test result is easily reduced.
Disclosure of Invention
In view of the above, the invention provides an evaluation method for the inhibition of the hydration ability of the shale by the water-based drilling fluid with accurate and reliable results, which can solve the technical problems.
Specifically, the method comprises the following technical scheme:
a method for evaluating the capability of a water-based drilling fluid for inhibiting the hydration of shale, wherein the method comprises the following steps: providing a dried shale sample, testing the dried shale sample for the spacing d of the lattice layers001；
Adding a certain amount of the dried shale sample and a certain amount of the water-based drilling fluid to be evaluated into a reaction bottle, stirring for a first set time at a set temperature, and then centrifuging for a second set time;
collecting the hydration sediment of the shale sample, and testing the lattice layer spacing d of the sediment of the shale sample001；
Obtaining the lattice layer spacing d of the hydration sediment of the shale sample001And the spacing d between lattice layers of the dried shale sample001Difference of (a) d001；
Comparing said difference Δ d001Comparing with an evaluation standard, and judging the strength of the water-based drilling fluid to be evaluated for inhibiting the shale hydration capability;
wherein the evaluation criteria are as follows:
0.22≥△d001if the water-based drilling fluid to be evaluated is more than 0, the shale hydration inhibition capacity of the water-based drilling fluid to be evaluated is strong;
0.5≥△d001if the water-based drilling fluid to be evaluated is more than 0.22, the shale hydration inhibition capacity of the water-based drilling fluid to be evaluated is stronger;
0.7≥△d001if the water-based drilling fluid to be evaluated is more than 0.5, the shale hydration inhibition capacity of the water-based drilling fluid to be evaluated is weaker;
1≥△d001and if the water-based drilling fluid is more than 0.7, the shale hydration inhibition capacity of the water-based drilling fluid to be evaluated is weak.
In one possible implementation mode, a plurality of water-based drilling fluids with known shale hydration inhibition capacity and the shale sample are used for carrying out experiments, and the corresponding delta d of each water-based drilling fluid is obtained001Further develop the evaluationAnd (5) price standard.
In one possible implementation, the experiment is performed multiple times for each water-based drilling fluid known to have a known capacity to inhibit shale hydration.
In one possible implementation, the shale sample is selected from at least one of montmorillonite, illite, and kaolin.
In one possible implementation, the shale sample is montmorillonite.
In one possible implementation, the lattice layer spacing d is measured using an X-ray diffractometer001。
In one possible implementation, the set temperature is between 25 ℃ and 35 ℃.
In one possible implementation, the first set time is 20 hours to 30 hours;
the second set time is 15 minutes to 30 minutes.
In one possible implementation, the centrifugal speed is 4000r/min to 5500r/min when the centrifugal treatment is carried out.
In one possible implementation, the method further includes: at the acquisition of Δ d001And then observing the hydration state of the hydration sediment of the shale sample.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
the evaluation method for inhibiting hydration capability of the clay shale by the water-based drilling fluid provided by the embodiment of the invention is based on the water absorption amount and hydration state of the clay in the shale and the spacing d between the clay lattice layers001And (3) correspondingly, soaking a dried shale sample in the water-based drilling fluid to be evaluated, hydrating the shale sample after stirring, and collecting the hydration sediment of the shale sample through centrifugal treatment. Testing the lattice layer spacing d of the hydration sediment of the shale sample respectively001Lattice layer spacing d from dried shale sample001Obtaining the difference Δ d between the two001. Will be the difference Deltad001Compared with the evaluation standard, the strength of the water-based drilling fluid to be evaluated for inhibiting the shale hydration ability can be quantitatively judged, and the evaluation process is ensuredAccuracy and reliability. Therefore, the method provided by the embodiment of the invention can effectively judge the water-based drilling fluid inhibiting mud shale hydration capacity, so that the water-based drilling fluid is better guided to be optimized, prepared and maintained when drilling a shale stratum, a scientific basis is provided for well wall stability control when drilling mud shale, and well wall instability is better prevented, thereby reducing the drilling cost and improving the safety of underground construction.
Detailed Description
In order to make the technical solutions and advantages of the present invention more clear, embodiments of the present invention will be described in further detail below.
The embodiment of the invention provides an evaluation method for the ability of a water-based drilling fluid to inhibit the hydration of shale, which comprises the following steps:
providing a dried shale sample, and testing the dried shale sample for the spacing d between the lattice layers001。
Adding a quantitative dry shale sample and a quantitative water-based drilling fluid to be evaluated into a reaction bottle, stirring at a set temperature for a first set time, and then centrifuging for a second set time.
Collecting the hydrated sediment of the shale sample, and testing the spacing d between the crystal layers of the sediment of the shale sample001。
Obtaining the lattice layer spacing d of the hydration sediment of the shale sample001Lattice layer spacing d from dried shale sample001Difference of (a) d001。
Will be the difference Deltad001And comparing the water-based drilling fluid with the evaluation standard to judge the strength of the water-based drilling fluid to be evaluated in inhibiting the shale hydration capability.
The evaluation criteria are as follows:
if 0.22. gtoreq. Δ d001If the water-based drilling fluid is more than 0, the water-based drilling fluid to be evaluated has strong shale hydration inhibition capacity;
if 0.5. gtoreq. delta d001If the water-based drilling fluid is more than 0.22, the shale hydration inhibition capability of the water-based drilling fluid to be evaluated is stronger;
if 0.7. gtoreq. delta d001If the water-based drilling fluid is more than 0.5, the shale hydration inhibition capacity of the water-based drilling fluid to be evaluated is weaker;
if 1 is not less than Δ d001And if the water-based drilling fluid is more than 0.7, the shale hydration inhibition capacity of the water-based drilling fluid to be evaluated is weak.
The evaluation method for inhibiting hydration capability of the clay shale by the water-based drilling fluid provided by the embodiment of the invention is based on the water absorption amount and hydration state of the clay in the shale and the spacing d between the clay lattice layers001And (3) correspondingly, soaking a dried shale sample in the water-based drilling fluid to be evaluated, hydrating the shale sample after stirring, and collecting the hydration sediment of the shale sample through centrifugal treatment. Testing the lattice layer spacing d of the hydration sediment of the shale sample respectively001Lattice layer spacing d from dried shale sample001Obtaining the difference Δ d between the two001. Will be the difference Deltad001And compared with the evaluation standard, the strength of the water-based drilling fluid to be evaluated for inhibiting the shale hydration ability can be quantitatively judged, and the accuracy and the reliability of the evaluation process are ensured. Therefore, the method provided by the embodiment of the invention can effectively judge the water-based drilling fluid inhibiting mud shale hydration capacity, so that the water-based drilling fluid is better guided to be optimized, prepared and maintained when drilling a shale stratum, a scientific basis is provided for well wall stability control when drilling mud shale, and well wall instability is better prevented, thereby reducing the drilling cost and improving the safety of underground construction.
Aiming at the phenomenon that when the water-based drilling fluid drills a mud shale stratum, the mud shale generates hydration expansion in the water-based drilling fluid, the inventor researches and discovers that the phenomenon is actually intercalation phenomenon, namely water molecules enter a clay layered main structure and maintain reversible insertion of main structure characteristics, the intercalation layer increases the space between clay lattice layers, and the increase of the space between the clay layers (hydration expansion) can cause instability of a well wall in the drilling process. Therefore, if the borehole wall is kept stable, the spacing between clay crystal layers is reduced, and the bonding force between adjacent crystal layers is enhanced. Based on the principle, the embodiment of the invention provides the method for evaluating the shale hydration inhibition strength of the water-based drilling fluid.
For the evaluation criterion, the following method can be adopted: by utilizing various water-based drilling fluids and shale samples with known strong and weak shale hydration inhibition capacityPerforming experiments to obtain the corresponding delta d of each water-based drilling fluid001And further, establishing an evaluation standard.
When the evaluation standard is established, the hydration experiment of the shale sample is carried out on the water-based drilling fluids, and the lattice layer spacing d of the shale sample is tested before and after the experiment001Obtaining a difference Δ d001. It will be appreciated that the experiments involved in making the above evaluation criteria are substantially identical to the experiments involved in determining the hydration inhibition ability of the water-based drilling fluid to be evaluated, and that, in addition to differences in the water-based drilling fluids used, other experimental items and operating parameters should be kept identical to ensure that the determination results are sufficiently reliable.
It was found that001The smaller the water-based drilling fluid, the stronger the hydration inhibition of the clay, i.e., the more inhibition of the hydration of the shale.
Taking a plurality of water-based drilling fluids with different wells or different formulas in the same shale gas block, and comparing the delta d of the water-based drilling fluid to be evaluated with other water-based drilling fluids001And comparing the detection results, and evaluating the relative strength of the inhibition capacity of the composite material on the hydration of the shale.
In formulating the evaluation standard, the various water-based drilling fluids with known shale hydration inhibition ability can be obtained from different wells of the same shale gas block or a plurality of water-based drilling fluid samples with different formulas.
When the evaluation criteria are formulated for experiments, multiple experiments can be carried out on each water-based drilling fluid with known shale hydration inhibition capacity, and all experiment results delta d are taken001Arithmetic mean of the values.
The shale sample adopted in the standard making is the same as the shale sample adopted in the evaluation test of the water-based drilling fluid to be evaluated. Wherein, based on the property of the shale, the shale sample can be selected from at least one of montmorillonite, illite and kaolin. Preferably, the shale sample is montmorillonite to improve the accuracy of the evaluation result.
Further, the method provided by the embodiment of the present invention further includes: at the acquisition of Δ d001Then, observing the hydration state of the hydration sediment of the shale sample, and utilizing delta d001After the water-based drilling fluid is determined to have strong and weak inhibition capacity on shale hydration, the hydration state of the hydration sediment of the shale sample is observed, and the accuracy of the evaluation method can be further verified. Once a mismatch occurs, Δ d can be retested001And the value is used for ensuring the accuracy and reliability of the evaluation result.
For example, montmorillonite commonly found in shale can be used for X-ray diffractometer detection of the different water-based drilling fluids to obtain d001Value, and then obtaining Δ d001And a corresponding relation table of the lattice interlayer spacing difference value and the shale hydration inhibition capacity of the water-based drilling fluid is prepared, the table can be referred to as table 1, and meanwhile, the hydration state of the montmorillonite is observed (by using a high-power microscope) so as to further confirm the reliability of the shale hydration inhibition capacity of the water-based drilling fluid, so that the purpose of accurately judging the shale hydration inhibition capacity of the water-based drilling fluid is achieved.
TABLE 1
In the embodiment of the invention, the lattice layer spacing d of the shale sample is measured by using an X-ray diffractometer001As will be appreciated by those skilled in the art, the lattice layer spacing d is obtained using an X-ray diffractometer001The specific steps of the present invention are not set forth herein in the examples, which are conventional in the art.
In order to hydrate the shale sample in the water-based drilling fluid as much as possible, in the embodiment of the invention, after a certain amount of dried shale sample and a certain amount of water-based drilling fluid to be evaluated are added into a reaction bottle, the mixture can be stirred for 20 hours to 30 hours at the temperature of 25 ℃ to 35 ℃, and then centrifuged for 15 minutes to 30 minutes, so that the shale sample precipitate can be smoothly obtained.
For example, the set temperature may be 25 ℃, 27 ℃, 30 ℃, 31 ℃, 33 ℃, 35 ℃ or the like; the stirring time may be 20 hours, 22 hours, 24 hours, 26 hours, 28 hours, 30 hours, 35 hours, or the like; the time of the above centrifugation treatment may be 15 minutes, 18 minutes, 20 minutes, 25 minutes, 28 minutes, 30 minutes, or the like.
In order to improve the effect of the centrifugal treatment, the shale sample precipitate is collected as much as possible, and the centrifugal rotation speed can be 4000r/min-5500r/min, such as 4000r/min, 4500r/min, 5000r/min, 5200r/min and the like.
As an example, in conducting the above evaluation experiments, a dry clean iodine vial may be charged with a 1.00g sample of shale, such as dry clay, followed by 50.00mL of the water-based drilling fluid to be evaluated, a magneton to be magnetically stirred, and the stopper screwed. And then putting the whole into a water bath kettle at 30 ℃, stirring for 24 hours, centrifuging for 20 minutes at the rotating speed of 5000r/min, and taking the shale sample precipitate. Measuring d with X-ray diffractometer001The value is obtained.
In order to further prove the reliability of the evaluation method provided by the embodiment of the invention, three drilling fluids (potassium chloride drilling fluid, high-performance water-based drilling fluid and oil-based drilling fluid, the hydration inhibition capability of which is gradually enhanced) with strong and weak hydration inhibition capability known in the art are adopted for evaluation by the method provided by the embodiment of the invention. The test result shows that the d of the potassium chloride drilling fluid001D of 1.91nm high-performance water-based drilling fluid001D value of 1.39nm, oil-based drilling fluid001A value of 1.32nm, i.e. Δ d of the three001The values are gradually reduced, and the method provided by the embodiment of the invention is also proved to be very reliable and have good accuracy in evaluating the hydration inhibition capacity of the water-based drilling fluid.
In conclusion, the method provided by the embodiment of the invention can effectively evaluate the strength of the water-based drilling fluid in inhibiting the hydration capability of the shale, has reliable principle and accurate result, can better guide the optimization, maintenance and use of the drilling fluid when drilling the shale stratum, provides scientific basis for the stability control of the well wall when drilling the shale, and better prevents the instability of the well wall, thereby reducing the drilling cost and improving the safety of underground construction.
The invention is further described below by means of specific examples:
detection of
Selecting montmorillonite as standard shale sample, and testing the dried shale sample with X-ray diffractometer001The value was 1.011 nm. 1.00g of dry clay is added into 7 dry clean iodine flasks respectively, 50.00mL of water-based drilling fluid of 7 wells in the Sichuan Changning-Weiyuan shale gas area is added into the dry clean iodine flasks respectively, magnetons are placed into the flasks and then bottle stoppers are screwed. Placing 7 iodine flasks in a 30 deg.C water bath, stirring for 24 hr, and centrifuging at 5000r/min for 20 min. Subsequently, the shale sample precipitates in 7 iodine flasks were collected and measured for d by an X-ray diffractometer001The value is obtained.
Data processing
D of nanomontmorillonite after the water-based drilling fluid contacts the montmorillonite001Increasing the d of montmorillonite treated with water-based drilling fluid001D minus dried montmorillonite not treated with water-based drilling fluid001The difference between the two is delta d001The data obtained from the above tests are shown in Table 2.
TABLE 2 evaluation test data for hydration inhibition ability of Changning-Weiyuan water-based drilling fluid
Evaluation of inhibition of shale hydration ability
As can be seen from Table 2, Δ d001If the drilling fluid is small, the water-based drilling fluid has relatively strong inhibition capacity on the hydration of the shale, such as the water-based drilling fluid of a well B, a well F and a well G; delta d001And if the drilling fluid is large, the water-based drilling fluid has relatively weak hydration inhibition capability on the shale, such as the water-based drilling fluid for wells A, C, D and E.
According to said Δ d001And (4) simultaneously observing the hydration state of the montmorillonite treated by the corresponding water-based drilling fluid, and further judging the strength of the water-based drilling fluid for inhibiting the hydration capability of the shale.
TABLE 3 water-based drilling fluid inhibition shale hydration ability corresponding table
As can be seen from table 2 and table 3, the judgment result (see table 2) of the strength of the hydration inhibition capability of the water-based drilling fluid obtained by the method provided by the embodiment of the present invention is consistent with the actual situation (see table 3, especially the hydration state), which further indicates the validity of the evaluation method provided by the embodiment of the present invention and the accuracy and reliability of the test result.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for evaluating the capability of a water-based drilling fluid for inhibiting the hydration of shale, which is characterized by comprising the following steps: providing a dried shale sample, testing the dried shale sample for the spacing d of the lattice layers001；
Adding a certain amount of the dried shale sample and a certain amount of the water-based drilling fluid to be evaluated into a reaction bottle, stirring for a first set time at a set temperature, and then centrifuging for a second set time;
collecting the hydration sediment of the shale sample, and testing the lattice layer spacing d of the sediment of the shale sample001；
Obtaining the lattice layer spacing d of the hydration sediment of the shale sample001And the spacing d between lattice layers of the dried shale sample001Difference of (a) d001；
Comparing said difference Δ d001Comparing with an evaluation standard, and judging the strength of the water-based drilling fluid to be evaluated for inhibiting the shale hydration capability;
wherein the evaluation criteria are as follows:
0.22≥△d001if the water-based drilling fluid to be evaluated is more than 0, the shale hydration inhibition capacity of the water-based drilling fluid to be evaluated is strong;
0.5≥△d001if the water-based drilling fluid to be evaluated is more than 0.22, the shale hydration inhibition capacity of the water-based drilling fluid to be evaluated is stronger;
0.7≥△d001if the water-based drilling fluid to be evaluated is more than 0.5, the shale hydration inhibition capacity of the water-based drilling fluid to be evaluated is weaker;
1≥△d001and if the water-based drilling fluid is more than 0.7, the shale hydration inhibition capacity of the water-based drilling fluid to be evaluated is weak.
2. The method for evaluating the shale hydration inhibition capacity of the water-based drilling fluid according to claim 1, wherein the method is characterized in that a plurality of water-based drilling fluids with known shale hydration inhibition capacity and the shale sample are used for carrying out experiments to obtain the corresponding delta d of each water-based drilling fluid001And further formulating the evaluation standard.
3. The method for evaluating the shale hydration inhibition capacity of the water-based drilling fluid according to claim 2, wherein the experiment is performed for each water-based drilling fluid with known shale hydration inhibition capacity.
4. The method of claim 1, wherein the shale sample is selected from at least one of montmorillonite, illite, and kaolin.
5. The method for evaluating the ability of the water-based drilling fluid to inhibit the hydration of the shale according to claim 4, wherein the shale sample is montmorillonite.
6. The method for evaluating the capability of the water-based drilling fluid for inhibiting the hydration of the shale as claimed in claim 1, wherein the lattice layer spacing d is measured by an X-ray diffractometer001。
7. The method for evaluating the shale hydration inhibition capability of the water-based drilling fluid according to claim 1, wherein the set temperature is 25-35 ℃.
8. The method for evaluating the shale hydration inhibition capability of the water-based drilling fluid according to claim 1, wherein the first set time is 20 hours to 30 hours;
the second set time is 15 minutes to 30 minutes.
9. The method for evaluating the shale hydration inhibition capacity of the water-based drilling fluid as claimed in claim 1, wherein the centrifugal rotation speed is 4000r/min to 5500r/min during the centrifugal treatment.
10. The method for evaluating the ability of a water-based drilling fluid to inhibit the hydration of shale according to any one of claims 1 to 9, wherein the method further comprises: at the acquisition of Δ d001And then observing the hydration state of the hydration sediment of the shale sample.
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| US10287475B1 (en) * | 2018-05-14 | 2019-05-14 | Southwest Petroleum University | Shale inhibitor and preparation method thereof, water-based drilling fluid, and shale gas drilling and extraction method |
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2019
- 2019-12-03 CN CN201911219043.8A patent/CN112903907A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10287475B1 (en) * | 2018-05-14 | 2019-05-14 | Southwest Petroleum University | Shale inhibitor and preparation method thereof, water-based drilling fluid, and shale gas drilling and extraction method |
Non-Patent Citations (3)
| Title |
|---|
| 王军义等: "生物聚合物甲基葡萄糖甙钻井液抑制机理", 《石油钻采工艺》 * |
| 袁俊秀: "聚胺页岩黏土水化膨胀抑制剂NH-1作用机理研究", 《西安石油大学学报(自然科学版)》 * |
| 黄进军等: "水基钻井液用聚胺抑制剂研究与性能评价", 《化学世界》 * |
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