Test paper for detecting content of base fluid of near-oil-based drilling fluid as well as preparation method and use method of test paper
By attaching colorimetric indicators and other components to the base paper of the test paper, the problem of determining the base content of near-oil-based drilling fluids has been solved, achieving rapid, simple, and accurate detection results. It is suitable for field applications of near-oil-based drilling fluids.
Patent Information
- Application Number
- CN202410972530.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2026-01-20
AI Technical Summary
In the field application of near-oil-based drilling fluids, the lack of a rapid, simple, and accurate method for determining the base fluid content leads to inaccurate base fluid maintenance, affecting downhole safety and causing material waste.
A test strip for detecting the base fluid content of near-oil-based drilling fluid was developed. The test strip consists of a test solution composed of a colorimetric indicator, an adhesive, a formaldehyde solution, and a standard hydrochloric acid solution, which is attached to the base paper. The test strip rapidly detects the base fluid content using a colorimetric reaction and is equipped with a standard colorimetric card for comparison.
It enables rapid, simple, and accurate detection of near-oil-based drilling fluid base fluid content, meeting on-site maintenance needs, allowing for timely monitoring of changes, and is easy to carry and store, avoiding the need for titration.
Smart Images
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Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the field of petroleum engineering drilling technology, and particularly relates to a near-oil-base drilling fluid base fluid content detection test paper, a preparation method and a use method thereof. BACKGROUND
[0002] The near-oil-base drilling fluid is an original technology of Zhongyuan Petroleum Engineering Corporation, SINOPEC Group, and a low-water-activity near-oil-base base fluid is originally developed, and a near-oil-base drilling fluid system is developed by using the low-water-activity near-oil-base base fluid as a continuous phase and using common treatment agents on site, and the near-oil-base drilling fluid system has excellent properties such as strong inhibition, high lubrication, strong plugging and green environmental protection.
[0003] However, in the large-scale application of the near-oil-base drilling fluid, a content determination method of the active component of the near-oil-base drilling fluid base fluid has not been established, so that in the maintenance process of the drilling fluid on site, the maintenance amount of the base fluid is often supplemented according to the experience, the maintenance amount is low, and the downhole safety cannot be ensured, and if the maintenance amount is too large, material waste is caused.
[0004] At present, there is no quick, simple and accurate determination method of the near-oil-base base fluid content in the application of the near-oil-base drilling fluid system on site, so that the change of the base fluid content of the near-oil-base drilling fluid in the construction process on site cannot be accurately determined. Therefore, the application provides a near-oil-base drilling fluid base fluid content quick detection test paper and a use method. SUMMARY
[0005] Therefore, the application aims to provide a near-oil-base drilling fluid base fluid content detection test paper, a preparation method and a use method thereof which are quick, convenient and accurate in on-site determination.
[0006] The application provides a near-oil-base drilling fluid base fluid content detection test paper, which comprises a test paper base paper and an active component attached to the test paper base paper.
[0007] The detection liquid comprises a color developing indicator, an adhesive, a formaldehyde solution, a standard hydrochloric acid solution and a solvent.
[0008] The color developing indicator comprises a methyl green solution, a methyl orange solution and a bromophenol blue solution.
[0009] The volume of the color developing indicator is 10% to 16% of the volume of the detection liquid.
[0010] The concentration of the adhesive in the detection liquid is 10 to 25 g / L.
[0011] The content of the formaldehyde solution in the detection liquid is 5 to 10 g / L.
[0012] The volume of the standard hydrochloric acid solution is 4% to 6% of the volume of the detection liquid.
[0013] Preferably, the volume ratio of the methyl green solution, the methyl orange solution and the bromophenol blue solution is (2-3):(2-3):(1-2);
[0014] The concentration of the methyl green solution is 0.5-2.0 g / L;
[0015] The concentration of the methyl orange solution is 0.5-1.0 g / L;
[0016] The concentration of the bromophenol blue solution is 0.4-2.0 g / L.
[0017] Preferably, the adhesive is selected from starch and / or dextrin;
[0018] The concentration of the formaldehyde solution is 1-2 mol / L; and the concentration of the standard hydrochloric acid solution is 0.2 mol / L.
[0019] Preferably, the solvent of the methyl green solution is water; the solvent of the methyl orange solution is water; the solvent of the bromophenol blue solution is 20% ethanol solution; and the standard hydrochloric acid solution is a standard hydrochloric acid aqueous solution and / or a standard hydrochloric acid ethanol solution.
[0020] Preferably, the solvent is an alcohol solvent and water; and the volume ratio of the alcohol solvent and water is (4-8):(6-2).
[0021] Preferably, the alcohol solvent is selected from ethanol and / or glycerol;
[0022] The test paper base paper is selected from chromatographic filter paper, qualitative filter paper or quantitative filter paper.
[0023] The application also provides a preparation method of the test paper for detecting the base fluid content of near oil-based drilling fluid, comprising the following steps:
[0024] The test paper base paper is soaked in the detection liquid, and then dried to obtain the test paper for detecting the base fluid content of near oil-based drilling fluid;
[0025] The detection liquid comprises a color developing indicator, an adhesive, a formaldehyde solution, a standard hydrochloric acid solution and a solvent;
[0026] The color developing indicator comprises a methyl green solution, a methyl orange solution and a bromophenol blue solution;
[0027] The volume of the color developing indicator is 10%-16% of the volume of the detection liquid;
[0028] The concentration of the adhesive in the detection liquid is 10-25 g / L;
[0029] The content of the formaldehyde solution in the detection liquid is 5-10 g / L;
[0030] The volume of the standard hydrochloric acid solution is 4% to 6% of the volume of the detection liquid.
[0031] Preferably, the soaking time is 20 to 30 minutes; and the drying temperature is not higher than 70 DEG C.
[0032] The application further provides a use method of the near oil-based drilling fluid base fluid content detection test paper, comprising the following steps:
[0033] The near oil-based drilling fluid base fluid content detection test paper is immersed in the near oil-based drilling fluid to be detected, and the content of the near oil-based drilling fluid base fluid in the near oil-based drilling fluid to be detected is obtained according to the standard colorimetric card.
[0034] The application further provides a near oil-based drilling fluid base fluid content detection kit, comprising the near oil-based drilling fluid base fluid content detection test paper and the standard colorimetric card.
[0035] The application provides a near oil-based drilling fluid base fluid content detection test paper, comprising a test paper base paper and active components attached to the test paper base paper; the active components are formed by a detection liquid; the detection liquid comprises a color developing indicator, an adhesive, a formaldehyde solution, a standard hydrochloric acid solution and a solvent; the color developing indicator comprises a methyl green solution, a methyl orange solution and a bromophenol blue solution; the volume of the color developing indicator is 10% to 16% of the volume of the detection liquid; the concentration of the adhesive in the detection liquid is 10 to 25 g / L; the content of the formaldehyde solution in the detection liquid is 5 to 10 g / L; and the volume of the standard hydrochloric acid solution is 4% to 6% of the volume of the detection liquid. BRIEF DESCRIPTION OF DRAWINGS
[0036] Figure 1 The standard colorimetric card obtained in Example 1 of the application is shown in the following figure. DETAILED DESCRIPTION
[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.
[0038] The present application provides a kind of near oil base drilling fluid base fluid content test paper, including test paper base paper and active component attached on test paper base paper;The active component is formed by detection liquid;The detection liquid includes color indicator, adhesive, formaldehyde solution, standard hydrochloric acid solution and solvent;The color indicator includes methyl green solution, methyl orange solution and bromophenol blue solution;The volume of color indicator is 10%~16% of the volume of detection liquid;The concentration of adhesive in detection liquid is 10~25g / L;The content of formaldehyde solution in detection liquid is 5~10g / L;The volume of standard hydrochloric acid solution is 4%~6% of the volume of detection liquid.
[0039] According to the present application, the test paper base paper can be the test paper base paper known to those skilled in the art, and there is no special restriction, and in the present application, chromatography filter paper, qualitative filter paper or quantitative filter paper is preferred;The length of the test paper base paper is preferably 50~80mm;The width of the test paper base paper is preferably 8~10mm.
[0040] According to the present application, the test paper base paper is attached with active component, which is formed by detection liquid;The detection liquid includes color indicator, adhesive, formaldehyde solution, standard hydrochloric acid solution and solvent.
[0041] The chromogenic indicator includes methyl green solution, methyl orange solution and bromophenol blue solution; different chromogenic agents are mixed, different pH value ranges are corresponding to different chromogenic agents, so that the test paper has a wide color developing range and a wide content range of the base solution to be detected; the concentration of the methyl green solution is preferably 0.5-2.0 g / L, more preferably 0.5-1.5 g / L, more preferably 0.5-1.0 g / L, and most preferably 0.5 g / L; the solvent of the methyl green solution is preferably water; the concentration of the methyl orange solution is preferably 0.5-1.0 g / L, more preferably 0.5-0.8 g / L, and more preferably 0.5 g / L; the solvent of the methyl orange solution is preferably water; the concentration of the bromophenol blue solution is preferably 0.4-2.0 g / L, more preferably 0.4-1.5 g / L, more preferably 0.4-1.0 g / L, more preferably 0.4-0.8 g / L, and most preferably 0.4 g / L; the solvent of the bromophenol blue solution is preferably an aqueous ethanol solution, more preferably 20%-30% ethanol, and more preferably a 20% ethanol solution; the volume ratio of the methyl green solution, the methyl orange solution and the bromophenol blue solution is preferably (2-3) : (2-3) : (1-2); in some embodiments, the volume ratio of the methyl green solution, the methyl orange solution and the bromophenol blue solution is specifically 2:2:1, 3:3:1, 3:2:1 or 3:3:2; the volume of the chromogenic indicator is preferably 10%-16% of the volume of the detection solution, more preferably 10%-15%, more preferably 10%-13%, and most preferably 10%-12%.
[0042] The adhesive is any adhesive known to those skilled in the art, and is not particularly limited, and preferably starch and / or dextrin in the present application; the concentration of the adhesive in the detection solution is preferably 10-25 g / L; in some embodiments, the concentration of the adhesive in the detection solution is specifically 10 g / L, 15 g / L, 20 g / L or 25 g / L.
[0043] The concentration of formaldehyde in the formaldehyde solution is preferably 1-2 mol / L; the content of the formaldehyde solution in the detection solution is preferably 5-10 g / L; in some embodiments, the concentration of the formaldehyde solution in the detection solution is specifically 5 g / L, 7 g / L or 10 g / L.
[0044] The standard hydrochloric acid solution is any standard hydrochloric acid solution known to those skilled in the art, and is not particularly limited, and preferably a standard aqueous hydrochloric acid solution and / or a standard hydrochloric acid ethanol solution; the concentration of the standard hydrochloric acid solution is preferably 0.2 mol / L; the volume of the standard hydrochloric acid solution is preferably 4%-6% of the volume of the detection solution; in some embodiments, the volume of the standard hydrochloric acid solution is specifically 4%, 5% or 6% of the volume of the detection solution.
[0045] The residual amount of the detection liquid is a solvent; the solvent is preferably an alcohol solvent and water; the alcohol solvent is preferably ethanol and / or glycerol; the volume ratio of the alcohol solvent to water is preferably (4-8):(6-2), more preferably (5-8):(5-2), and more preferably (6-8):(4-2); in some embodiments of the present application, the volume ratio of the alcohol solvent to water is specifically 6:4, 7:3 or 8:2.
[0046] The near oil-based base fluid content detection test paper provided by the present application can quickly and simply detect the base fluid content in the near oil-based drilling fluid, the detection result is accurate, the demand for on-site near oil-based drilling fluid base fluid maintenance can be met, and the change of the near oil-based drilling fluid base fluid content on site can be timely mastered; and the test paper is small in size, convenient to carry, fast in detection speed, beneficial to long-distance relocation and storage of on-site construction drilling teams, does not need to use other solutions for titration, and is extremely convenient to detect.
[0047] The present application also provides a preparation method of the near oil-based drilling fluid base fluid content detection test paper, comprising the following steps: soaking the test paper base paper in a detection liquid, and drying to obtain the near oil-based drilling fluid base fluid content detection test paper; the detection liquid comprises a color developing indicator, an adhesive, a formaldehyde solution, a standard hydrochloric acid solution and a solvent; the color developing indicator comprises a methyl green solution, a methyl orange solution and a bromophenol blue solution; the volume of the color developing indicator is 10%-16% of the volume of the detection liquid; the concentration of the adhesive in the detection liquid is 10-25 g / L; the content of the formaldehyde solution in the detection liquid is 5-10 g / L; and the volume of the standard hydrochloric acid solution is 4%-6% of the volume of the detection liquid.
[0048] In the present application, there is no special limitation on the source of all raw materials, which can be commercially available; the color developing indicator, the adhesive, the formaldehyde solution, the standard hydrochloric acid solution and the solvent are the same as described above, and will not be repeated here.
[0049] The test paper base paper is soaked in a detection liquid, and dried to obtain the near oil-based drilling fluid base fluid content detection test paper; the soaking time is preferably 20-30 min; the drying is preferably vacuum drying; and the drying temperature is preferably not higher than 70 DEG C, more preferably 40 DEG C-70 DEG C, more preferably 50 DEG C-60 DEG C, and most preferably 50 DEG C.
[0050] The present application also provides a near oil-based drilling fluid base fluid content detection kit, comprising the above-mentioned near oil-based drilling fluid base fluid content detection test paper and a standard colorimetric card; the standard colorimetric card is obtained by immersing the above-mentioned near oil-based drilling fluid base fluid content detection test paper in different concentrations of near oil-based drilling fluid base fluid standard solution and developing color.
[0051] In the present application, the near oil-based drilling fluid base fluid standard solution with different concentrations is preferably a series of concentration gradient near oil-based drilling fluid base fluid standard solutions, more preferably a series of concentration gradient near oil-based drilling fluid base fluid standard solutions with a volume concentration of 5% to 30%, and even more preferably a series of concentration gradient near oil-based drilling fluid base fluid standard solutions with a volume concentration of 5% to 25%. The volume concentration here refers to the volume percentage of the near oil-based drilling fluid base fluid in the near oil-based drilling fluid base fluid standard solution. In the present application, the near oil-based drilling fluid base fluid standard solution with different concentrations is preferably obtained by mixing water and near oil-based drilling fluid base fluid. The gradient step of the series of concentration gradient near oil-based drilling fluid base fluid standard solutions is preferably 2% to 10%, more preferably 4% to 8%, and even more preferably 5%.
[0052] The present application also provides a use method of the near oil-based drilling fluid base fluid content test paper, which comprises the following steps: immersing the above-mentioned near oil-based drilling fluid base fluid content test paper into the near oil-based drilling fluid to be measured, and obtaining the content of the near oil-based drilling fluid base fluid in the near oil-based drilling fluid to be measured according to the standard colorimetric chart.
[0053] In the present application, the standard colorimetric chart is preferably prepared according to the following steps: S1) preparing near oil-based drilling fluid base fluid standard solutions with different concentrations; S2) immersing the above-mentioned near oil-based drilling fluid base fluid content test paper into the near oil-based drilling fluid base fluid standard solution, taking it out after color development is complete, recording the color displayed by each, and obtaining the standard colorimetric chart. The near oil-based drilling fluid base fluid standard solution with different concentrations is the same as described above, and will not be repeated here. The time for immersing the near oil-based drilling fluid base fluid content test paper into the near oil-based drilling fluid base fluid standard solution is preferably 5 to 10 s. After taking it out, color development is complete, and the standard color corresponding to the standard colorimetric chart is preferably found on the Pantone color card to obtain the standard colorimetric chart according to the color value of each standard color.
[0054] The near oil-based drilling fluid base fluid content test paper is immersed in the near oil-based drilling fluid to be measured, and is taken out after 5 to 10 s, and the content of the near oil-based drilling fluid base fluid in the near oil-based drilling fluid to be measured is obtained according to the standard colorimetric chart after color development is complete. Specifically, when the color tone after color development is consistent with the standard colorimetric chart, the concentration indicated by the standard colorimetric chart is directly taken as the measurement value; when the color tone after color development is located between two color numbers in the standard colorimetric chart, the intermediate concentration of the concentrations indicated by the two color numbers is taken as the measurement value.
[0055] The test paper provided by the present application detects the content of the near oil-based drilling fluid base fluid based on the determination of the amine value, determines the amine value in the base fluid by using the hydrochloric acid titration method, the remaining different volumes of hydrochloric acid change the color of the acid-base indicator after the reaction of the base fluid and hydrochloric acid, the color change on the test paper is compared with the standard colorimetric chart, and thus the content of the base fluid is determined.
[0056] In order to further illustrate the present application, the following embodiments provide a kind of near oil-based drilling fluid base fluid content test paper, its preparation method and use method provided by the present application are described in detail.
[0057] The reagents used in the following examples are all commercially available. The near oil-based drilling fluid base fluid used in the examples is a polyether amine-based alkyl glycoside produced by Sinopec Zhongyuan Petroleum Engineering Company; The dextrin used in the examples is an analytical pure product commercially available from Tianjin Kemieuo Chemical Reagent Co., Ltd.
[0058] Example 1
[0059] The present embodiment provides a preparation method of a near oil-based drilling fluid base fluid content test paper and a standard color card, comprising the following steps:
[0060] (1) Preparation of detection solution: components are 60% ethanol aqueous solution (volume ratio of ethanol to water is 6:4), color developing indicator, dextrin adhesive, formaldehyde solution (1 mol / L) and standard hydrochloric acid aqueous solution (0.2 mol / L);
[0061] The color developing indicator includes 0.5 g / L methyl green aqueous solution, 0.5 g / L methyl orange aqueous solution and 0.4 g / L bromophenol blue 20% ethanol solution in a volume ratio of 2:2:1;
[0062] The volume percentage of color developing indicator in the detection solution is 10%, the content of dextrin adhesive is 10 g / L, the content of formaldehyde solution is 5 g / L, and the volume percentage of standard hydrochloric acid aqueous solution is 4%;
[0063] Mix according to the above component content, stir well, and the detection solution can be obtained.
[0064] (2) Preparation of base fluid test paper: take the chromatographic filter paper and completely immerse it in the above detection solution, take it out after 20 min, and vacuum dry at a temperature of 50℃. After drying, cut the filter paper into a rectangular strip with a length of 50 mm and a width of 8 mm; That is, the base fluid content test paper is prepared.
[0065] (3) Preparation of standard color card: prepare base fluid standard solutions with volume ratios of 5%, 10%, 15%, 20% and 25% using pure water, immerse the prepared base fluid test paper in the solution, take it out after 5 seconds, and find the standard color with consistent color tone on the Pantone color card according to the color presented by the test paper, to prepare the standard color card.
[0066] The standard color card prepared in this embodiment is as shown in Figure 1 .
[0067] Example 2
[0068] The embodiment provides a preparation method of near oil-based drilling fluid base fluid content detection test paper and a standard color card, and comprises the following steps:
[0069] (1) Preparation of detection solution: the components are 70% glycerol aqueous solution (the volume ratio of glycerol to water is 7:3), color developing indicator, dextrin adhesive, formaldehyde solution (1 mol / L) and standard hydrochloric acid aqueous solution (0.2 mol / L);
[0070] The color developing indicator comprises 0.5 g / L methyl green aqueous solution, 0.5 g / L methyl orange aqueous solution and 0.4 g / L bromophenol blue 20% ethanol solution in a volume ratio of 3:3:1;
[0071] The volume percentage of the color developing indicator in the detection solution is 12%, the content of the dextrin adhesive is 15 g / L, the content of the formaldehyde solution is 7 g / L, and the volume percentage of the standard hydrochloric acid aqueous solution is 5%;
[0072] The detection solution can be obtained by mixing the components according to the above content and stirring uniformly.
[0073] (2) Preparation of base fluid detection test paper: qualitative filter paper is completely soaked in the above detection solution, and is taken out after 20 minutes and vacuum dried at a temperature of 50 DEG C. After drying, the filter paper is cut into a rectangular strip with a length of 50 mm and a width of 8 mm, and the base fluid content detection test paper is prepared.
[0074] (3) Preparation of standard color card: standard base fluid solutions with volume ratios of 5%, 10%, 15%, 20% and 25% are prepared by using pure water, the prepared base fluid detection test paper is immersed in the solutions, taken out after 5 seconds, and the standard color with the same color tone as the color presented by the test paper is found on the Pantone color card to prepare the standard color card.
[0075] The detection limit of the standard color card prepared in the embodiment is consistent with that of example 1.
[0076] Example 3
[0077] The embodiment provides a preparation method of near oil-based drilling fluid base fluid content detection test paper and a standard color card, and comprises the following steps:
[0078] (1) Preparation of detection solution: the components are 70% glycerol aqueous solution (the volume ratio of glycerol to water is 7:3), color developing indicator, dextrin adhesive, formaldehyde solution (1 mol / L) and standard hydrochloric acid aqueous solution (0.2 mol / L);
[0079] The color developing indicator comprises 0.5 g / L methyl green aqueous solution, 0.5 g / L methyl orange aqueous solution and 0.4 g / L bromophenol blue 20% ethanol solution in a volume ratio of 3:2:1;
[0080] The volume percentage of the color developing indicator in the detection solution is 10%, the content of the dextrin adhesive is 20 g / L, the content of the formaldehyde solution is 10 g / L, and the volume percentage of the standard hydrochloric acid ethanol solution is 5%;
[0081] The detection solution is obtained by mixing the components according to the above content and stirring uniformly.
[0082] (2) Preparation of base fluid detection test paper: Take the quantitative filter paper and completely immerse it in the above detection solution, take it out after 20 minutes, and vacuum dry at a temperature of 50 DEG C. After drying, cut the filter paper into a rectangular strip with a length of 50 mm and a width of 8 mm; that is, the base fluid content detection test paper is prepared.
[0083] (3) Preparation of standard colorimetric card: Prepare standard solutions of the base fluid with a volume ratio of 5%, 10%, 15%, 20% and 25% by using pure water, immerse the prepared base fluid detection test paper in the solution, take it out after 5 seconds, and find the standard color with the same color tone on the Pantone color card according to the color presented by the test paper, to prepare the standard colorimetric card.
[0084] The detection limit of the standard colorimetric card prepared in this example is consistent with that of Example 1.
[0085] Example 4
[0086] The embodiment provides a preparation method of a near oil-based drilling fluid base fluid content detection test paper and a standard colorimetric card, which comprises the following steps:
[0087] (1) Preparation of detection solution: components are 80% glycerol aqueous solution (volume ratio of glycerol to water is 8:2), color developing indicator, dextrin adhesive, formaldehyde solution (1 mol / L) and standard hydrochloric acid ethanol solution (0.2 mol / L);
[0088] The color developing indicator comprises 0.5 g / L methyl green aqueous solution, 0.5 g / L methyl orange aqueous solution and 0.4 g / L bromophenol blue 20% ethanol solution with a volume ratio of 3:3:2;
[0089] The volume percentage of the color developing indicator in the detection solution is 10%, the content of the dextrin adhesive is 25 g / L, the content of the formaldehyde solution is 10 g / L, and the volume percentage of the standard hydrochloric acid ethanol solution is 6%;
[0090] The detection solution is obtained by mixing the components according to the above content and stirring uniformly.
[0091] (2) Preparation of base fluid detection test paper: Take the quantitative filter paper and completely immerse it in the above detection solution, take it out after 20 minutes, and vacuum dry at a temperature of 50 DEG C. After drying, cut the filter paper into a rectangular strip with a length of 50 mm and a width of 8 mm; that is, the base fluid content detection test paper is prepared.
[0092] (3) Preparation of standard color card: Prepare 5%, 10%, 15%, 20%, 25% base solution standard solution with pure water respectively, immerse the prepared base solution test paper in the solution, take out after 5 seconds, find the standard color with the same color tone on the Pantone color card according to the color presented by the test paper, and prepare the standard color card.
[0093] The detection limit of the standard color card prepared in this embodiment is consistent with that of Example 1.
[0094] Example 5
[0095] The use method of the near oil-based base fluid content test paper provided by the application comprises the following steps:
[0096] (1) Take the medium pressure filtrate of the near oil-based drilling fluid;
[0097] (2) Immerse the base fluid content test paper in the solution, take out after 5 seconds, compare the color presented by the test paper with the standard color card, and read the base fluid content in the near oil-based drilling fluid; in this embodiment, the base fluid content is detected by using the base fluid test paper and the standard color card prepared in Example 1.
[0098] When the color tone of the filtrate after color development is consistent with the standard color card, the indicated concentration of the color card is directly taken as the measurement value, and if the color depth is between two color numbers, the intermediate concentration of the indicated concentrations of the two color numbers is taken as the measurement value.
[0099] Example 6
[0100] The use method of the near oil-based base fluid content test paper provided by the application comprises the following steps:
[0101] (1) Take the medium pressure filtrate of the near oil-based drilling fluid;
[0102] (2) Immerse the base fluid content test paper in the solution, take out after 5 seconds, compare the color presented by the test paper with the standard color card, and read the base fluid content in the near oil-based drilling fluid; in this embodiment, the base fluid content is detected by using the base fluid test paper and the standard color card prepared in Example 2.
[0103] When the color tone of the filtrate after color development is consistent with the standard color card, the indicated concentration of the color card is directly taken as the measurement value, and if the color depth is between two color numbers, the intermediate concentration of the indicated concentrations of the two color numbers is taken as the measurement value.
[0104] Example 7
[0105] The use method of the near oil-based base fluid content test paper provided by the application comprises the following steps:
[0106] (1) Take the medium pressure filtrate of the near oil-based drilling fluid;
[0107] (2) the base fluid content test paper is immersed in the solution, taken out after 5 seconds, and the color presented by the test paper is compared with the standard color card to read the base fluid content in the near oil-based drilling fluid; in this example, the base fluid content is detected using the base fluid test paper prepared in Example 4 and the standard color card.
[0108] When the color tone of the filtrate after color development is consistent with the standard color card, the concentration indicated by the color card is directly taken as the measurement value, and if the color depth is between two color numbers, the intermediate concentration of the concentration indicated by the two color numbers is taken as the measurement value.
[0109] Example 8
[0110] The use method of the near oil-based base fluid content test paper provided by the application comprises the following steps:
[0111] (1) taking the medium pressure filtrate of the near oil-based drilling fluid;
[0112] (2) the base fluid content test paper is immersed in the solution, taken out after 5 seconds, and the color presented by the test paper is compared with the standard color card to read the base fluid content in the near oil-based drilling fluid; in this example, the base fluid content is detected using the base fluid test paper prepared in Example 4 and the standard color card.
[0113] When the color tone of the filtrate after color development is consistent with the standard color card, the concentration indicated by the color card is directly taken as the measurement value, and if the color depth is between two color numbers, the intermediate concentration of the concentration indicated by the two color numbers is taken as the measurement value.
[0114] Comparative Examples 1-4
[0115] The base fluid content on-site titration detection method is as follows: 1 mL of filtrate is taken into a 150 mL beaker, 50 mL of water is added. Put into a magnetic rotor, uniform speed stirring on a magnetic stirrer, use a pH meter to measure the pH value of the solution, record the initial pH value, slowly drop in the standard hydrochloric acid solution, drop to the pH value reading of the solution 3.10, the volume of the hydrochloric acid solution consumed at this place does not need to be recorded. Then, use the standard NaOH solution to titrate the solution to the initial pH value. Finally, use the standard hydrochloric acid solution for titration, drop to the pH value reading of the solution 3.00, record the amount of standard hydrochloric acid solution consumed. According to the amount of standard hydrochloric acid solution, calculate the amine value, compare with the standard curve chart, substitute into the linear fitting formula y=0.0998x-0.0045 to obtain the base fluid content.
[0116] The experimental method of Comparative Examples 1-4 is the same, and all are performed according to the above-mentioned base solution content field titration detection method; the test paper produced in Examples 1-4 is compared with the base solution content field titration detection method in Comparative Examples 1-4, in order to improve the accuracy of the detection comparison, the volume ratio of 15% base solution is measured in the comparison experiment, and the comparison experiment is shown in Table 1. From the experimental data, it can be seen that the test paper detection result is compared with the titration detection, and the difference is within 0.5%, the difference is small, which shows that the test paper detection of the base solution content has high accuracy, and its convenience is higher than that of the titration method.
[0117] Table 1 Comparison experiment data of test paper and titration method of Examples 1-4
[0118]
[0119] The above-mentioned is only the preferred embodiment of the present application, it should be pointed out that, for the ordinary skilled in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.
Claims
1. A test paper for detecting the content of near-oil-based drilling fluid, characterized in that, It includes a test strip base paper and an active component attached to the test strip base paper; the active component is formed from a detection solution; The detection solution includes a colorimetric indicator, an adhesive, a formaldehyde solution, a standard hydrochloric acid solution, and a solvent; The colorimetric indicator includes methyl green solution, methyl orange solution and bromophenol blue solution; The volume of the colorimetric indicator is 10% to 16% of the volume of the detection liquid; The concentration of the adhesive in the test solution is 10–25 g / L; The formaldehyde solution in the test solution has a concentration of 5–10 g / L; The volume of the standard hydrochloric acid solution is 4% to 6% of the volume of the test solution.
2. The near-oil-based drilling fluid content test paper according to claim 1, characterized in that, The volume ratio of the methyl green solution, methyl orange solution and bromophenol blue solution is (2-3):(2-3):(1-2); The concentration of the methyl green solution is 0.5–2.0 g / L; The concentration of the methyl orange solution is 0.5–1.0 g / L; The concentration of the bromophenol blue solution is 0.4–2.0 g / L.
3. The near-oil-based drilling fluid content test paper according to claim 1, characterized in that, The adhesive is selected from starch and / or dextrin; The concentration of the formaldehyde solution is 1-2 mol / L; the concentration of the standard hydrochloric acid solution is 0.2 mol / L.
4. The near-oil-based drilling fluid content test paper according to claim 1, characterized in that, The solvent for the methyl green solution is water; the solvent for the methyl orange solution is water; the solvent for the bromophenol blue solution is a 20% ethanol solution; and the standard hydrochloric acid solution is a standard hydrochloric acid aqueous solution and / or a standard hydrochloric acid ethanol solution.
5. The near-oil-based drilling fluid content test paper according to claim 1, characterized in that, The solvent is an alcohol solvent and water; the volume ratio of the alcohol solvent to water is (4-8):(6-2).
6. The near-oil-based drilling fluid content test paper according to claim 5, characterized in that, The alcohol solvent is selected from ethanol and / or glycerol; The base paper of the test strip is selected from chromatography filter paper, qualitative filter paper, or quantitative filter paper.
7. A method for preparing a test paper for detecting the content of near-oil-based drilling fluid, characterized in that, Includes the following steps: The test paper base is soaked in the test solution and dried to obtain the near-oil-based drilling fluid base fluid content test paper; The detection solution includes a colorimetric indicator, an adhesive, a formaldehyde solution, a standard hydrochloric acid solution, and a solvent; The colorimetric indicator includes methyl green solution, methyl orange solution and bromophenol blue solution; The volume of the colorimetric indicator is 10% to 16% of the volume of the detection liquid; The concentration of the adhesive in the test solution is 10–25 g / L; The formaldehyde solution in the test solution has a concentration of 5–10 g / L; The volume of the standard hydrochloric acid solution is 4% to 6% of the volume of the test solution.
8. The preparation method according to claim 7, characterized in that, The soaking time is 20 to 30 minutes; the drying temperature is not higher than 70°C.
9. A method for using a test strip for detecting the content of near-oil-based drilling fluid, characterized in that... Includes the following steps: Immerse the near-oil-based drilling fluid base content test paper according to any one of claims 1 to 6 or the near-oil-based drilling fluid base content test paper prepared by the preparation method according to claim 7 or 8 into the near-oil-based drilling fluid to be tested, and obtain the content of near-oil-based drilling fluid base in the near-oil-based drilling fluid to be tested according to the standard colorimetric card.
10. A near-oil-based drilling fluid content detection kit, characterized in that, The test paper includes the near-oil-based drilling fluid content test paper according to any one of claims 1 to 6, or the near-oil-based drilling fluid content test paper prepared by the preparation method of claim 7 or 8, and a standard colorimetric card; the standard colorimetric card is obtained by immersing the near-oil-based drilling fluid content test paper according to any one of claims 1 to 6, or the near-oil-based drilling fluid content test paper prepared by the preparation method of claim 7 or 8, in near-oil-based drilling fluid standard solutions of different concentrations for color development.