CN112661907A - Preparation method of polymer fluid loss agent and polymer fluid loss agent - Google Patents
Preparation method of polymer fluid loss agent and polymer fluid loss agent Download PDFInfo
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- CN112661907A CN112661907A CN202011399757.4A CN202011399757A CN112661907A CN 112661907 A CN112661907 A CN 112661907A CN 202011399757 A CN202011399757 A CN 202011399757A CN 112661907 A CN112661907 A CN 112661907A
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- fluid loss
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Abstract
The invention discloses a preparation method of a polymer fluid loss agent and the polymer fluid loss agent, wherein the polymer fluid loss agent is prepared by modifying starch natural vegetable gum, has good temperature resistance, salt resistance and strong fluid loss reduction capability, is a multi-element high molecular copolymer capable of dissociating negative electricity groups in water, and can be adsorbed on the surface of clay to form an adsorption layer on one hand so as to prevent the flocculation and enlargement of clay particles; on the other hand, the fine particles dispersed under the action of the circulating stirring of the drilling fluid can be stabilized by adsorption and are not bonded into large particles. Thus, the proportion of fine particles with enough quantity can be ensured, so that the drilling fluid can form a thin and compact filter cake, the filtration loss is reduced, and the drilling fluid has good rubber protection effect.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a preparation method of a polymer fluid loss additive and the polymer fluid loss additive.
Background
In the pseudo-songorian basin, due to the fact that large sections of active soft mudstone exist in the sedimentary stratum, hydration and dispersion of clay are prone to occur when the sedimentary stratum meets a mudstone well section, and therefore it is required that a filter loss additive product with good performance is added into a drilling fluid system to control liquid phase in the drilling fluid to invade the stratum, and damage to an oil-gas layer and a near-well wall zone due to liquid phase invasion is avoided or reduced.
In the drilling process, most of the water-based waste drilling fluid is directly discharged after being simply treated, so that the treatment cost of the waste drilling fluid is reduced, the requirements on the waste drilling fluid in the environment are stricter under the increasingly severe environmental protection conditions, and thus, the various treating agents used in a drilling fluid system are required to have the characteristics of no toxicity, degradability and the like.
Disclosure of Invention
Therefore, based on the above background, the invention provides a preparation method of a polymer fluid loss agent, which modifies natural vegetable gum to prepare the fluid loss agent with good temperature resistance, short molecular chain, more groups capable of being combined with clay distributed on the molecular chain, strong glue protection capability, easy formation of thin and tough mud cake, and strong fluid loss reduction capability.
A preparation method of a polymer fluid loss agent comprises the following preparation steps:
s1: putting starch into alkaline solution for hydrolysis, and carrying out primary modification;
s2: adding a certain amount of AMPS, acrylamide and DMDAAC into the starch system subjected to preliminary modification in the step S1, adding a certain amount of initiator, heating the mixed solution to 45 ℃, and carrying out constant-temperature reaction for 2 hours;
s3: and (4) granulating, drying and crushing the product obtained after the reaction in the step S2 to obtain the fluid loss additive.
The invention also provides a polymer fluid loss additive prepared according to the preparation method.
Further, the molecular weight of the polymeric fluid loss additive of the present invention is 90.0 ten thousand.
According to the requirement of a high-temperature-resistant drilling fluid system, the filtrate reducer with high-temperature resistance and salt resistance needs to have the following properties:
(1) the atoms or atomic groups in the molecule are connected by chemical bonds with high thermal stability such as C-C, C-S, C-N, and the like, so that ether bonds (-O-) and ester bonds (-COO-) are avoided as much as possible;
(2) the main molecular chain is provided with groups with stronger adsorption capacity to clay particles, such as cationic groups;
(3) the molecular chain is provided with strong hydration groups so as to improve the temperature resistance and salt resistance of the polymer drilling fluid;
(4) the hydrophilic group is an ionic group, such as a carboxylic group, a sulfonic group, a sulfomethyl group and the like, preferably a strong acidic group, and the proportion of the hydrophilic group is adapted to the mineralization degree of the drilling fluid;
(5) the relative molecular mass is proper, the drilling fluid can not be thickened seriously within the use concentration range, and the rheological property is ensured to be good;
(6) can fully exert the effect under the condition of low pH value.
By adopting the technical scheme, the beneficial effects are as follows:
the polymer fluid loss agent is a multi-element high-molecular copolymer which can dissociate negative electricity groups in water, and one side of the polymer fluid loss agent can be adsorbed on the surface of clay to form an adsorption layer so as to prevent clay particles from being flocculated and enlarged; on the other hand, the fine particles dispersed under the action of the circulating stirring of the drilling fluid can be stabilized by adsorption and are not bonded into large particles. Thus, the proportion of fine particles with enough quantity can be ensured, so that the drilling fluid can form a thin and compact filter cake, the filtration loss is reduced, and the drilling fluid has good rubber protection effect.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: a polymer fluid loss additive is prepared by the following steps:
s1: putting starch into alkaline solution for hydrolysis, and carrying out primary modification;
s2: adding a certain amount of AMPS, acrylamide and DMDAAC into the starch system subjected to preliminary modification in the step S1, adding a certain amount of initiator, heating the mixed solution to 45 ℃, and carrying out constant-temperature reaction for 2 hours;
s3: and (4) granulating, drying and crushing the product obtained after the reaction in the step S2 to obtain the fluid loss additive.
The molecular weight of the polymer fluid loss agent prepared by the method is 90.0 ten thousand.
Example 2: in the present example, the temperature resistance and salt resistance of the filtrate reducer prepared by the present invention were experimentally evaluated.
The physicochemical properties of the drilling fluid used in this example are shown in table one:
table one: physical and chemical properties of drilling fluid
The preparation scheme of the base slurry in the example is shown in table two, and the slurry sample-adding detection data is shown in table three.
Table two: base slurry preparation scheme
| Serial number | Scheme(s) |
| 1 | Sample of 400mL of water, 16g of sodium bentonite, 0.96g of sodium carbonate and 1.6g of sodium carbonate |
| 2 | Sample of 400mL of water, 18g of sodium chloride, 2g of anhydrous calcium chloride, 5.2g of anhydrous magnesium chloride, 60g of sodium bentonite, 2g of sodium carbonate and 4g of sodium carbonate |
Table three: mud sample application detection data
Remarking: aging at 120 deg.C for 16 hr, and measuring medium pressure water loss and apparent viscosity.
By combining the second table and the third table, the invention has better fluid loss reducing effect in a composite salt water drilling fluid system.
Example 3: this example was an experimental evaluation of a weighted slurry of the fluid loss additive of the present invention.
Because the bottom pressure of the deep well is high, the required drilling fluid density is high, the high-density drilling fluid increases the filtration loss of the drilling fluid, the mud density is increased, the pressure difference between the mud fluid column pressure and the formation pore space is increased, and the filtration loss of the mud entering the formation is increased. The same components are adopted to prepare drilling fluids with different densities so as to detect the aging performance of the drilling fluid, and the experimental results are shown in the fourth table.
The drilling fluid comprises 400mL of water, 20g of sodium-soil powder, 0.8g of sodium carbonate, 1.2g of sodium hydroxide, 4g of fluid loss additive, 20g of potassium chloride and barite.
Table four: evaluation of filtrate reducer Performance
The fourth table shows that the filtrate reducer can obviously reduce the permeability of filter cakes in drilling fluids with different densities, reduce the filtrate loss of the drilling fluids, and has better compatibility in high-density drilling fluids.
Example 4: this example is a test for evaluating the inhibition performance of the fluid loss additive of the present invention.
Weighing 100g of a core sample with the particle size of 2.0-3.2 mm, adding the core sample and a high-temperature-resistant and salt-resistant filtrate reducer solution with a certain concentration into a 400mL aging tank, rolling for 16h in a 120 ℃ roller furnace, sieving by a 60-mesh standard sieve, drying for 2h at 105 ℃, weighing, and obtaining inhibition performance evaluation data shown in the fifth table.
Table five: fluid loss additive inhibition test data
| Sample concentration% | 0.0 | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 |
| Shale recovery rate% | 42.2 | 67.8 | 72.5 | 79.8 | 81.2 | 84.2 |
As can be seen from Table V: the filtrate reducer has a good inhibiting effect, and can greatly reduce hydration and dispersion effects of shale salt, because the molecular chain of the high-temperature-resistant composite salt water-resistant filtrate reducer simultaneously has anionic and cationic groups. The clay particles are respectively adsorbed on the flat surface of the clay with negative charges and the end surface of the clay with positive charges in an electrostatic action and hydrogen bond action mode, so that the coating effect on the clay particles can be realized; on the other hand, after the organic cationic groups are adsorbed on the flat surface of the clay, the zeta potential of the clay particles is reduced, the hydration tendency of the clay particles is effectively weakened, meanwhile, the anionic groups with extremely high hydration capacity are distributed on one side of the clay particle phase and are fully hydrated, a thicker adsorption solvolysis layer is brought to the coated colloidal particles, the resistance of water molecules penetrating through a hydration film to contact with the clay particles is increased, the sufficient shear strength is improved, and the aim of inhibiting the hydration expansion of the shale is finally achieved.
Example 5: in this example, the fluid loss additive of the present invention and a commonly used fluid loss additive on the market are compared and tested for fluid loss reduction capability under different application conditions.
The selected filtrate reducers on the current market are respectively as follows: JT-888 (Henan), SP-8 (Clarity), MV-CMC (Luzhou), LV-CMC (Xinjiang).
Firstly, preparing three different application conditions, wherein the preparation schemes are as follows:
scheme 1: weighing the composite brine 400, adding 0.1% of sodium hydroxide and 0.3% of sodium carbonate, fully stirring for treatment, then adding 4% of sodium soil, stirring at a high speed for 20min, and curing for 16h to be used as base slurry. Respectively adding 1% filtrate reducer, stirring at high speed for 20min, maintaining at constant temperature of 25 deg.C for 16 hr, maintaining at 120 deg.C for 16 hr, and measuring medium pressure filtration loss and viscosity. The comparison results are shown in Table six.
Table six: scheme 1 Experimental data for fluid loss additives
Scheme 2: preparing thick slurry: preparing 10% thick slurry by using fresh water, and maintaining for 6 hours;
thick slurry: composite brine (treated 0.1% sodium hydroxide, 0.3% sodium carbonate, thoroughly stirred) 1: 1.5, slowly adding 1 percent of filtrate reducer sample after uniform dilution, and respectively measuring the medium pressure filtration loss and the viscosity after constant temperature curing at 25 ℃ for 16h and rolling curing at 80 ℃ for 16 h. The comparison results are shown in Table seven.
TABLE VII: scheme 2 Experimental data for fluid loss additives
Scheme 3: and detecting the quality condition of the product according to the standard of 'natural polymer filtrate loss reducer YL-GJL for drilling fluid'. The comparison results are shown in Table eight.
Table eight: scheme 3 Experimental data for fluid loss additives
From the experimental data of the fluid loss additives in table six, table seven and table eight under different application conditions, it can be seen that the fluid loss additive has strong adaptability and shows better fluid loss reducing capability compared with the existing fluid loss additive. Compared with other filtrate reducers, the fluid loss reducer is more suitable for a soft mud shale formation drilling fluid system in the sub-songorian basin region; and when the drilling fluid is applied to a soft mud shale formation drilling fluid system in the sub-Monacol basin region, the drilling fluid can be used as a main filtrate reducer and is compounded with other filtrate reducers for use.
The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. The preparation method of the polymer fluid loss agent is characterized by comprising the following preparation steps:
s1: putting starch into alkaline solution for hydrolysis, and carrying out primary modification;
s2: adding a certain amount of AMPS, acrylamide and DMDAAC into the starch system subjected to preliminary modification in the step S1, adding a certain amount of initiator, heating the mixed solution to 45 ℃, and carrying out constant-temperature reaction for 2 hours;
s3: and (4) granulating, drying and crushing the product obtained after the reaction in the step S2 to obtain the fluid loss additive.
2. A polymeric fluid loss additive prepared according to the method of claim 1.
3. The polymeric fluid loss additive according to claim 2, having a molecular weight of 90.0 ten thousand.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116004207A (en) * | 2022-12-02 | 2023-04-25 | 中国水利水电第七工程局成都水电建设工程有限公司 | Slot-forming wall-protecting slurry for underground diaphragm wall of sand gravel stratum |
| CN116004207B (en) * | 2022-12-02 | 2024-05-31 | 中国水利水电第七工程局成都水电建设工程有限公司 | Slot-forming wall-protecting slurry for underground diaphragm wall of sand gravel stratum |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104194741A (en) * | 2014-08-05 | 2014-12-10 | 新乡市富邦科技有限公司 | High-temperature-resistant salt-resistant anti-collapse filtrate reducer for drilling fluid and preparation method of high-temperature-resistant salt-resistant anti-collapse filtrate reducer |
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- 2020-12-02 CN CN202011399757.4A patent/CN112661907A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104194741A (en) * | 2014-08-05 | 2014-12-10 | 新乡市富邦科技有限公司 | High-temperature-resistant salt-resistant anti-collapse filtrate reducer for drilling fluid and preparation method of high-temperature-resistant salt-resistant anti-collapse filtrate reducer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116004207A (en) * | 2022-12-02 | 2023-04-25 | 中国水利水电第七工程局成都水电建设工程有限公司 | Slot-forming wall-protecting slurry for underground diaphragm wall of sand gravel stratum |
| CN116004207B (en) * | 2022-12-02 | 2024-05-31 | 中国水利水电第七工程局成都水电建设工程有限公司 | Slot-forming wall-protecting slurry for underground diaphragm wall of sand gravel stratum |
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Application publication date: 20210416 |