CN112858576A - Judgment method for strong and weak shale gas drilling fluid inhibition - Google Patents
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- 238000005553 drilling Methods 0.000 title claims abstract description 187
- 239000012530 fluid Substances 0.000 title claims abstract description 178
- 230000005764 inhibitory process Effects 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000011084 recovery Methods 0.000 claims abstract description 77
- 238000005096 rolling process Methods 0.000 claims abstract description 77
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000005098 hot rolling Methods 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 4
- 238000011161 development Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 9
- 239000011435 rock Substances 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 4
- 238000011158 quantitative evaluation Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000012216 screening Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- G—PHYSICS
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
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Abstract
The invention discloses a method for judging strong and weak inhibition of shale gas drilling fluid, and belongs to the field of shale gas development. The method comprises the following steps: providing a shale sample; selecting a strong inhibitory drilling fluid from a well with the lowest average borehole diameter expansion rate of a drilled shale well section and no underground complex well related to borehole wall stability, and obtaining the rolling recovery rate of a shale sample by using the strong inhibitory drilling fluid, wherein the rolling recovery rate is marked as A; selecting weak inhibition drilling fluid from a complex underground well with the highest average borehole diameter expansion rate of a drilled shale well section or related to borehole wall stability, and obtaining the rolling recovery rate of a shale sample by using the weak inhibition drilling fluid, wherein the rolling recovery rate is marked as C; calculating the weighted average value of A and C, and recording as B; determining a judgment standard with strong drilling fluid inhibition according to A, B and C; obtaining the rolling recovery rate of the shale sample by using the drilling fluid to be evaluated, and recording the rolling recovery rate as N; and judging the strong inhibition of the drilling fluid to be evaluated according to the judgment standard and the N.
Description
Technical Field
The invention relates to the field of shale gas development, in particular to a judgment method for strong and weak shale gas drilling fluid inhibition.
Background
Drilling fluid is generally used for balancing formation pressure, transmitting power and carrying debris when shale gas wells are drilled, but shale reservoirs are easy to cause instability of a well wall after being soaked in the drilling fluid for a long time. In order to prevent collapse caused by large inclination of the shale gas well and instability of the well wall at a horizontal section, drilling fluid with strong inhibition is adopted to prevent hydration and expansion of shale as much as possible and avoid causing instability of the well wall. Therefore, the drilling fluid needs to be continuously subjected to performance testing before being prepared into a well and in the drilling process so as to ensure that the performance of the drilling fluid meets the shale gas drilling requirement.
At present, the drilling fluid for shale gas development (shale gas drilling fluid for short) is only subjected to various basic performance tests such as density, rheological property, solid content and the like, and the strong inhibition of the drilling fluid cannot be judged.
Disclosure of Invention
In view of the above, the invention provides a method capable of effectively judging strong and weak inhibition of shale gas drilling fluid. Specifically, the method comprises the following technical scheme:
a judgment method for strong and weak shale gas drilling fluid inhibition performance comprises the following steps:
providing a shale sample;
selecting a strong inhibition drilling fluid from a first shale gas well which has the lowest average well diameter expansion rate of a drilled shale well section and is not complicated underground and related to well wall stability, and acquiring the rolling recovery rate of the shale sample by using the strong inhibition drilling fluid, wherein the rolling recovery rate is marked as A;
selecting weak inhibition drilling fluid, wherein the weak inhibition drilling fluid comes from a second shale gas well which has the highest average borehole diameter expansion rate of a drilled shale well section or has downhole complexity related to borehole wall stability, and acquiring the rolling recovery rate of the shale sample by using the weak inhibition drilling fluid, and recording the rolling recovery rate as C;
calculating the weighted average value of A and C, and recording as B;
determining a judgment standard with strong drilling fluid inhibition according to the A, B and the C;
obtaining the rolling recovery rate of the shale sample by using the drilling fluid to be evaluated, and recording the rolling recovery rate as N;
and judging the strong inhibition of the drilling fluid to be evaluated according to the judgment standard of the strong inhibition of the drilling fluid and the N.
In one possible implementation, when N > a, the inhibition of the drilling fluid to be evaluated is strong;
when A is more than or equal to N and more than B, the inhibitive performance of the drilling fluid to be evaluated is stronger;
when B is more than or equal to N and more than or equal to C, the inhibitive performance of the drilling fluid to be evaluated is weaker;
when N is less than C, the inhibition of the drilling fluid to be evaluated is weak.
In one possible implementation manner, the shale sample is prepared by taking drill cuttings from a shale gas zone block to which the drilling fluid to be evaluated belongs and crushing the drill cuttings.
In a possible implementation manner, the initial particle size of the shale sample is 2 mm-4 mm, and the screening particle size of the shale sample after hot rolling treatment is 0.5 mm.
In a possible implementation manner, a plurality of strongly-inhibitory drilling fluids are correspondingly selected from a plurality of first-class shale gas wells, rolling recovery rates of shale samples are respectively obtained by using the strongly-inhibitory drilling fluids, and an average value is taken and recorded as A.
In one possible implementation, the first type of shale gas well is between 5 and 10 gas wells.
In a possible implementation manner, a plurality of weak inhibition drilling fluids are correspondingly selected from a plurality of second-class shale gas wells, rolling recovery rates of shale samples are respectively obtained by using the weak inhibition drilling fluids, and an average value is taken and recorded as C.
In one possible implementation, the second type of shale gas well is between 5 and 10.
In one possible implementation manner, a roller heating furnace and an oven are utilized to perform a rolling recovery rate test experiment to obtain the rolling recovery rate of the shale sample in different drilling fluid environments.
In one possible implementation manner, the rolling recovery rate of the shale sample in different drilling fluid environments is obtained at a set temperature;
and the set temperature is consistent with the wellbore temperature of the shale gas well.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the method for judging the strong and weak shale gas drilling fluid inhibition provided by the embodiment of the invention, the rolling recovery rate of the shale sample corresponding to the strong and weak inhibition drilling fluid is determined through the selection of the strong inhibition drilling fluid and the weak inhibition drilling fluid, and the judgment standard of the strong and weak drilling fluid inhibition is reliably determined through dividing the corresponding relation between each rolling recovery rate range and the corresponding drilling fluid inhibition capacity. After the judgment standard is determined, the rolling recovery rate of the shale sample soaked by the drilling fluid to be evaluated is detected, and the rolling recovery rate is compared with the judgment standard, so that the strong and weak inhibition of the drilling fluid to be evaluated can be effectively judged. Therefore, the method provided by the embodiment of the invention can judge the strong and weak inhibition of the shale gas drilling fluid, so that the shale gas well drilling fluid is better guided to be optimized, prepared and maintained, and the method plays a role in safe, excellent and fast drilling.
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 a method for judging strong and weak shale gas drilling fluid inhibition, which comprises the following steps:
step 1: a shale sample is provided.
Step 2: selecting a strong inhibition drilling fluid, wherein the strong inhibition drilling fluid comes from a first shale gas well which has the lowest average borehole diameter expansion rate of a drilled shale well section and does not have downhole complexity related to borehole wall stability, and obtaining the rolling recovery rate of a shale sample by using the strong inhibition drilling fluid, and recording the rolling recovery rate as A.
And step 3: and selecting weak inhibition drilling fluid, wherein the weak inhibition drilling fluid comes from a second shale gas well with the highest average borehole diameter expansion rate of a drilled shale well section or the occurrence of downhole complex related to borehole wall stability, and acquiring the rolling recovery rate of the shale sample by using the weak inhibition drilling fluid, and recording the rolling recovery rate as C.
And 4, step 4: the weighted average of A and C is calculated and recorded as B.
And 5: and determining a judgment standard with strong drilling fluid inhibition according to A, B and C.
Step 6: and obtaining the rolling recovery rate of the shale sample by using the drilling fluid to be evaluated, and recording the rolling recovery rate as N.
And 7: and judging the strong inhibition of the drilling fluid to be evaluated according to the judgment standard of the strong inhibition of the drilling fluid and the N.
According to the method for judging the strong and weak shale gas drilling fluid inhibition provided by the embodiment of the invention, the rolling recovery rate of the shale sample corresponding to the strong and weak inhibition drilling fluid is determined through the selection of the strong inhibition drilling fluid and the weak inhibition drilling fluid, and the judgment standard of the strong and weak drilling fluid inhibition is reliably determined through dividing the corresponding relation between each rolling recovery rate range and the corresponding drilling fluid inhibition capacity. After the judgment standard is determined, the rolling recovery rate of the shale sample soaked by the drilling fluid to be evaluated is detected, and the rolling recovery rate is compared with the judgment standard, so that the strong and weak inhibition of the drilling fluid to be evaluated can be effectively judged. Therefore, the method provided by the embodiment of the invention can judge the strong and weak inhibition of the shale gas drilling fluid, so that the shale gas well drilling fluid is better guided to be optimized, prepared and maintained, and the method plays a role in safe, excellent and fast drilling.
It will be appreciated that in performing steps 2, 3 and 6, the conditions remain the same except for the drilling fluid used to ensure that the comparison is valid.
Specifically, the drilling fluid inhibition can be judged by adopting the following judgment criteria:
when N is more than A, the inhibitive performance of the drilling fluid to be evaluated is strong;
when A is more than or equal to N and more than B, the inhibitive performance of the drilling fluid to be evaluated is stronger;
when B is more than or equal to N and more than or equal to C, the inhibitive performance of the drilling fluid to be evaluated is weaker;
when N is less than C, the inhibition of the drilling fluid to be evaluated is weak.
In general, the value of A should be less than or equal to 1%, and if the value of A is greater than 1%, 1% is taken as the value of A.
In the embodiment of the invention, when preparing the shale sample, a batch of shale samples of the same type can be prepared at the same time so as to meet the requirements of establishing standards and the quantity of the shale samples in actual detection, and the used shale samples can be obtained in the following modes:
the shale sample is prepared by taking drill cuttings from a shale gas area block to which the drilling fluid to be evaluated belongs and crushing, the initial particle size of the prepared shale sample is 2-4 mm, and the shale sample with a proper mesh number can be obtained by using a double-layer sieve in the process. The screening grain size of the shale sample after hot rolling treatment is 0.5mm, so that the rolling recovery rate of the shale sample can be effectively evaluated.
In order to enable the judgment standard of strong drilling fluid inhibition to be more accurate and reliable, in the embodiment of the invention, a plurality of strong inhibition drilling fluids are correspondingly selected from a plurality of first-class shale gas wells, the rolling recovery rates of shale samples are respectively obtained by utilizing the plurality of strong inhibition drilling fluids, and the average value is taken and recorded as A. For example, shale gas wells of the first type range from 5 to 10 gas wells.
And correspondingly selecting a plurality of weak inhibition drilling fluids from the second-class shale gas wells, respectively obtaining the rolling recovery rates of the shale samples by using the weak inhibition drilling fluids, and taking the average value as C. For example, the second category of shale gas wells is 5-10.
Correspondingly selecting a plurality of strongly inhibitory drilling fluids from a plurality of first-class shale gas wells may include: and directly taking the drilling fluid used by the first type of shale gas well, or preparing a new drilling fluid according to a formula of the drilling fluid used by the first type of shale gas well. The acquisition process of the weakly inhibitory drilling fluid is the same.
For example, the average hole diameter expansion rate of the shale well section drilled by the shale gas block to which the drilling fluid to be evaluated belongs is selected to be the lowest, and 5-10 complicated underground wells related to the stability of the well wall do not appear, which shows that the well wall is stable and the drilling fluid inhibition is strong in the process of drilling the shale in the well. And taking a drilling fluid sample of the drilling fluid or preparing the drilling fluid sample according to a formula to be used as the strongly-inhibitive drilling fluid, detecting the rolling recovery rate of the shale sample of each strongly-inhibitive drilling fluid (of course, the data of the well subjected to the rolling recovery rate detection can be directly used), and calculating the arithmetic average value of the rolling recovery rates corresponding to the selected 5-10 wells, wherein the arithmetic average value is marked as A.
The average hole diameter expansion rate of the shale well section drilled by the shale gas block is the highest, or 5-10 underground complex wells related to the stability of the well wall appear, which indicates that the well wall is unstable and the drilling fluid inhibition is weak in the process of drilling the shale in the well. And (3) taking a drilling fluid sample of the drilling fluid or preparing the drilling fluid sample according to a formula to be used as the weak inhibition drilling fluid, detecting the rolling recovery rate of the shale sample of each weak inhibition drilling fluid (the well subjected to the rolling recovery rate detection can directly use the data), and calculating the arithmetic average value of the rolling recovery rates corresponding to the selected 5-10 wells, wherein the arithmetic average value is recorded as C%.
And calculating the weighted average value of the rolling recovery rates corresponding to the two types of drilling fluids, and recording the weighted average value as B.
And (3) making a shale gas drilling fluid inhibition judgment standard table, referring to table 1, and after the drilling fluid to be evaluated and other drilling fluids of the shale zone measure the rolling recovery rate N, judging the shale gas drilling fluid with strong inhibition by referring to the table.
TABLE 1
The roller heating furnace and the oven can be used for carrying out a rolling recovery rate test experiment, and further the rolling recovery rate of the shale sample in different drilling fluid environments can be obtained.
Specifically, the operation steps may be as follows:
firstly, taking dry rock cores or rock debris, crushing the dry rock cores or rock debris into particles with the particle size of 2-4 mm, and screening the particles with the particle size of 2-4 mm by using a double-layer screen to obtain a shale sample.
Weighing a certain mass of shale sample, for example 50g, adding the shale sample into an aging tank filled with a certain volume of drilling fluid to be evaluated, for example 350mL, and carrying out closed constant-temperature rolling for a certain time, for example 16h, at a simulated downhole temperature by using a roller heating furnace. Wherein, the drilling fluid to be evaluated can remove large-sized particles in the drilling fluid by a standard sieve with a mesh opening of 0.5mm before use so as to prevent the influence on the test result.
③ after cooling the aging tank, the shale sample particles in the drilling fluid are recovered using a 0.5mm standard sieve (including after sieving, washing and recovery), and oven-dried, for example, at a temperature of 105 ℃ +3 ℃ for 4h, and then weighed.
Recording test conditions including shale reservoir mode, storage history, initial moisture content of the shale sample, test temperature and heating rolling time so as to calculate the rolling recovery rate of the shale sample in the drilling fluid.
The rolling recovery rate is calculated by the following formula:
in the formula: Wr-Rolling recovery;
md-mass in g recovered after hot rolling of the shale sample;
m0shale samples were not hot rolled and had a moisture corrected mass in g.
For example, the initial mass of the shale sample is 50.0g, and the mass of the moisture-corrected shale sample is calculated by the following formula:
m0＝50×(1-Wh)
in the formula: m is0-mass of shale sample after moisture correction in g;
Wh-the moisture content of the shale sample.
The water content of the shale sample can be measured by a weighing method specified in GB/T5005-2010 (drilling fluid material specification), and the reduced mass is the water content by weighing and comparing the mass of the sample before and after drying.
It can be understood that when the strong and weak inhibition comparison detection of different drilling fluids is carried out, the same roller heating furnace is used for carrying out, the relevant data of the rolling recovery rate are obtained by ensuring that the test conditions are unchanged, and the comparative evaluation is carried out.
The roller heating furnace can adopt an XGRL-7 digital display type high-temperature variable-frequency hot rolling furnace, and the rotating speed of the roller heating furnace can be controlled to be 17 r/min-35 r/min.
Experiments prove that the shale gas drilling fluid has strong inhibition performance if the rolling recovery rate of shale samples in the drilling fluid is high; and the shale sample in the drilling fluid has low rolling recovery rate, so the shale gas drilling fluid has weak inhibition.
When the inhibition of the drilling fluid is strong and weak, qualitative detection can be firstly carried out, and then quantitative detection is carried out, so that the judgment efficiency can be improved, and the reliability of the judgment result can be improved. Wherein, during qualitative detection, clear water can be adopted for comparative detection. The ratio of the rolling recovery rate of the shale sample soaked in the drilling fluid to the rolling recovery rate of the shale sample soaked in clear water is large, so that the shale gas drilling fluid has strong inhibition; on the contrary, the shale gas drilling fluid has weak inhibition.
Or, a plurality of drilling fluid samples of different wells or different formulas in the same shale gas block can be taken, and the rolling recovery rate can be detected by adopting shale formation cuttings or same-formation outcrop shale cuttings. The relative strength of the inhibition of the drilling fluid to be evaluated can be evaluated by comparing the detection results of the drilling fluid to be evaluated with other drilling fluid.
In order to truly simulate the operation environment of the shale gas fracturing fluid, the rolling recovery rate of the shale sample in different drilling fluid environments is obtained at a set temperature; wherein the set temperature is consistent with the wellbore temperature of the shale gas well.
In conclusion, the method provided by the embodiment of the invention can effectively judge that the shale gas drilling fluid has strong inhibition in the shale stratum, has short period, strong operability and accurate and reliable result, can better guide the shale gas well drilling fluid to be optimized, prepared and maintained, improves the drilling time efficiency, reduces the drilling cost, improves the underground construction safety, and plays an important role in safe, excellent and fast drilling of shale gas.
By utilizing the method provided by the embodiment of the invention, the strong and weak drilling fluid inhibition of the X well of the shale gas block of Changning in Sichuan is judged:
qualitative evaluation
Firstly, taking 5L of drilling fluid samples used when an X well is drilled into a Longmaxi shale stratum and 1kg of returned rock debris, and detecting that the rolling recovery rate of the rock debris in the drilling fluid is 97.8% by using the method provided by the embodiment of the invention.
Secondly, drilling fluid samples of the other 4 wells in the Changning shale gas block are taken, rock debris of the Longmaxi shale stratum is adopted, and the rolling recovery rates of the rock debris in different drilling fluids are respectively 98.8%, 97.4%, 95.8% and 95.1% by using the method provided by the embodiment of the invention, so that the drilling fluid with the strongest inhibition can be obtained.
(2) Quantitative evaluation
Selecting a Changning shale gas block to drill the 6 underground complicated wells which have the lowest average well diameter expansion rate of the shale well section and are not related to the stability of the well wall. The method provided by the embodiment of the invention is utilized to measure the rolling recovery rate of the shale sample (see table 2) for each drilling fluid sample, and the arithmetic mean of the rolling recovery rates of the 6 drilling fluid samples is calculated to be 98.2%.
Table 2 rolling recovery of shale samples for strongly inhibitory drilling fluids
Selecting the Changning shale gas blocks to drill the 6 underground complicated wells with the highest average well diameter expansion rate of the shale well sections or the stability related to the well wall. The method provided by the embodiment of the invention is utilized to measure the rolling recovery rate of the shale sample (see table 3) for each drilling fluid sample, and the arithmetic mean value of the rolling recovery rates for the 6 drilling fluid samples is calculated to be 94.9%.
Table 3 rolling recovery of shale samples for weakly inhibitory drilling fluids
And thirdly, calculating the weighted average value of the rolling recovery rates of the two types of samples to be 96.6 percent.
Fourthly, a shale gas drilling fluid inhibition quantitative evaluation table is prepared, as shown in the table 4, and the X-well drilling fluid inhibition quantitative evaluation is carried out by contrasting the table. The rock debris rolling recovery rate of the X-well drilling fluid is 97.8%, and the inhibition is strong.
TABLE 4 quantitative evaluation chart of inhibition of Changning shale gas drilling fluid
| Roll recovery | >98.2％ | ≦ 98.2% and>96.6％ | 96.6% or less and 94.9% or more | <94.9％ |
| Drilling fluid inhibition | High strength | Is stronger | Is weaker | Weak (weak) |
The result shows that the downhole complexity related to the stability of the well wall does not appear in the X-well drilling process, the average borehole diameter expansion rate is low, and the evaluation result is consistent with the evaluation result with strong inhibition, so that the evaluation method provided by the embodiment of the invention is effective, and the result is accurate and reliable.
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 judgment method for strong and weak shale gas drilling fluid inhibition is characterized by comprising the following steps:
providing a shale sample;
selecting a strong inhibition drilling fluid from a first shale gas well which has the lowest average well diameter expansion rate of a drilled shale well section and is not complicated underground and related to well wall stability, and acquiring the rolling recovery rate of the shale sample by using the strong inhibition drilling fluid, wherein the rolling recovery rate is marked as A;
selecting weak inhibition drilling fluid, wherein the weak inhibition drilling fluid comes from a second shale gas well which has the highest average borehole diameter expansion rate of a drilled shale well section or has downhole complexity related to borehole wall stability, and acquiring the rolling recovery rate of the shale sample by using the weak inhibition drilling fluid, and recording the rolling recovery rate as C;
calculating the weighted average value of A and C, and recording as B;
determining a judgment standard with strong drilling fluid inhibition according to the A, B and the C;
obtaining the rolling recovery rate of the shale sample by using the drilling fluid to be evaluated, and recording the rolling recovery rate as N;
and judging the strong inhibition of the drilling fluid to be evaluated according to the judgment standard of the strong inhibition of the drilling fluid and the N.
2. The method for judging the strong inhibition of the shale gas drilling fluid according to claim 1, wherein when N is more than A, the inhibition of the drilling fluid to be evaluated is strong;
when A is more than or equal to N and more than B, the inhibitive performance of the drilling fluid to be evaluated is stronger;
when B is more than or equal to N and more than or equal to C, the inhibitive performance of the drilling fluid to be evaluated is weaker;
when N is less than C, the inhibition of the drilling fluid to be evaluated is weak.
3. The method for judging the shale gas drilling fluid with strong inhibition performance according to claim 1, wherein the shale sample is prepared by taking drill cuttings from a shale gas area block to which the drilling fluid to be evaluated belongs and crushing the drill cuttings.
4. The method for judging the strong inhibition of the shale gas drilling fluid according to claim 3, wherein the initial particle size of the shale sample is 2 mm-4 mm, and the screened particle size of the shale sample after hot rolling treatment is 0.5 mm.
5. The method for judging the shale gas drilling fluid with strong inhibition performance according to claim 1, wherein a plurality of drilling fluids with strong inhibition performance are correspondingly selected from a plurality of shale gas wells of a first type, rolling recovery rates of shale samples are respectively obtained by utilizing the drilling fluids with strong inhibition performance, and an average value is taken and recorded as A.
6. The method for judging the shale gas drilling fluid has strong inhibition performance according to claim 5, wherein the number of the first shale gas wells is 5-10.
7. The method for judging the shale gas drilling fluid with strong inhibition performance according to claim 1, wherein a plurality of weak inhibition drilling fluids are correspondingly selected from a plurality of second-type shale gas wells, the rolling recovery rates of the shale samples are respectively obtained by utilizing the weak inhibition drilling fluids, and the average value is recorded as C.
8. The method for judging the shale gas drilling fluid has strong inhibition performance, according to claim 7, characterized in that the second type shale gas well is 5-10 mouths.
9. The method for judging the shale gas drilling fluid with strong inhibition performance according to any one of claims 1 to 8, wherein a rolling recovery rate test experiment is performed by using a roller heating furnace and an oven to obtain the rolling recovery rate of the shale sample in different drilling fluid environments.
10. The method for judging the shale gas drilling fluid with strong inhibition performance according to claim 9, wherein the rolling recovery rate of the shale sample in different drilling fluid environments is obtained at a set temperature;
and the set temperature is consistent with the wellbore temperature of the shale gas well.
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