A clean oil agent for a biomass synthetic base drilling fluid and a preparation method thereof

Abstract

The present application provides a kind of biomass synthesis base drilling fluid with clean oil agent, comprising: penetrant 2-15 parts by weight;Complexing agent 5-30 parts by weight;Solubilizer 1-10 parts by weight;Emulsifier 8-30 parts by weight;Water 100 parts by weight;The penetrant is sulfosuccinate and / or polyoxyethylene ether compound;The complexing agent is organic phosphonate and / or hydroxyl carboxylate;The solubilizer is de-aromatic solvent oil;The emulsifier is betaine zwitterionic surfactant.Compared with the prior art, the biomass synthesis base drilling fluid with clean oil agent of the present application uses specific content of components, and each component has good interaction with each other, so that the obtained biomass synthesis base drilling fluid with clean oil agent has good cleaning effect, and because the preferred raw material does not contain aromatic hydrocarbon, it is biodegradable, safe to the environment, and beneficial to environmental protection;And the oil-based drilling fluid clean oil agent preparation method is simple, the conditions are mild, and is suitable for large-scale industrial production.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil field chemistry, and particularly relates to a biomass synthetic base drilling fluid oil cleaning agent, a preparation method and application thereof. BACKGROUND

[0002] In recent years, with the deepening of oil and gas exploration and development, the geological conditions drilled are more and more complex, and the exploration and development of shale oil and gas resources have higher requirements for drilling fluids. As an effective method for solving high-difficulty complex problems and ensuring smooth drilling of shale oil and gas formations, oil-based drilling fluid has been widely used. However, the base oil used in oil-based drilling fluid is diesel or white oil, which contains aromatic hydrocarbons and is not safe for personal safety and the environment, and its application in some environmentally sensitive areas has been limited.

[0003] Biomass synthetic base drilling fluid has gradually attracted attention due to its advantages of green environmental protection and biodegradability, so as to replace diesel (white) oil-based drilling fluid. Biomass synthetic base drilling fluid uses biomass synthetic oil as base oil, which includes saturated long-chain fatty groups and alkyl ether groups in structure and does not contain unsaturated bonds (such as ester bonds and carbon-carbon double bonds) and aromatic hydrocarbons. This kind of biomass synthetic oil has good biodegradability and is a kind of green and non-toxic product, which has no stimulating effect on human body and environment and has good ecological safety. However, the biomass synthetic base drilling fluid and its filter cake adhered to the well wall are difficult to remove, which leads to poor cement slurry interfacial cementing quality and affects the cementing quality. Therefore, effectively removing the adhering matter of biomass synthetic base drilling fluid on the well wall is an important technical means to ensure the cementing quality.

[0004] In the prior art, there is no special oil cleaning agent for biomass synthetic base drilling fluid, and oil-based drilling fluid is used. At present, there are various oil cleaning agents used at home and abroad, but they all have the problems of complex composition, poor flushing efficiency and incomplete sealing of the interfacial surface. Therefore, it is of great strategic significance to study an oil cleaning agent with good environmental protection, biodegradability, high flushing efficiency and wide application range to provide technical support for oil drilling. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to provide a biomass synthetic base drilling fluid oil cleaning agent with good flushing effect, a preparation method and application thereof.

[0006] The present application provides a biomass synthetic base drilling fluid oil cleaning agent, which comprises:

[0007]

[0008] The penetrating agent is selected from sulfosuccinate salts and / or polyoxyethylene ether compounds;

[0009] The complexing agent is selected from organic phosphonate and / or hydroxyl carboxylate;

[0010] The solubilizing agent is selected from de-aromatic solvent oil;

[0011] The emulsifying agent is selected from betaine amphoteric zwitterionic surfactant.

[0012] Preferably, the penetrating agent is selected from one or more of sodium sulfosuccinic acid di-sec-octyl ester and / or isomeric tridecanol polyoxyethylene ether.

[0013] Preferably, the complexing agent is selected from one or more of ethylenediamine tetramethylene phosphonic acid sodium salt, diethylene triamine penta-methylene phosphonate, citric acid, sodium gluconate and sodium alginate.

[0014] Preferably, the solubilizing agent is selected from one or more of D60, D80 and D100.

[0015] Preferably, the emulsifying agent is selected from one or more of cocamide propyl hydroxyl sulfobetaine, lauramide propyl betaine and lauramide propyl hydroxyl sulfobetaine.

[0016] The present application also provides a preparation method of the above-mentioned oil cleaning agent for biomass synthesis-based drilling fluid, comprising the following steps:

[0017] S) mixing the penetrating agent, the complexing agent, the solubilizing agent, the emulsifying agent and water, and obtaining the oil cleaning agent for biomass synthesis-based drilling fluid after reaction.

[0018] Preferably, the step S) is specifically:

[0019] mixing the penetrating agent and water to perform first stirring, then adding the complexing agent to perform second stirring, adding the solubilizing agent to perform third stirring, adding the emulsifying agent to perform fourth stirring, and obtaining the oil cleaning agent for biomass synthesis-based drilling fluid after reaction.

[0020] Preferably, the rotation speed of the first stirring, the second stirring, the third stirring and the fourth stirring is independently 300-1000 r / min; the time of the first stirring, the second stirring, the third stirring and the fourth stirring is independently 5-20 min; the reaction temperature is 30-50℃; and the reaction time is 0.5-2 h.

[0021] The present application also provides a use method of the above-mentioned oil cleaning agent for biomass synthesis-based drilling fluid, comprising: mixing the oil cleaning agent for biomass synthesis-based drilling fluid and cementing cleaning fluid.

[0022] Preferably, the mass of the oil cleaning agent for biomass synthesis-based drilling fluid is 10%-25% of the mass of the cementing cleaning fluid.

[0023] The application provides a biomass synthetic base drilling fluid oil cleaning agent, which comprises 2-15 parts by weight of a penetrating agent, 5-30 parts by weight of a complexing agent, 1-10 parts by weight of a solubilizing agent, 8-30 parts by weight of an emulsifying agent and 100 parts by weight of water; the penetrating agent is a sulfosuccinate salt and / or a polyoxyethylene ether compound; the complexing agent is an organic phosphonate and / or a hydroxyl carboxylate; the solubilizing agent is a de-aromatic hydrocarbon solvent oil; and the emulsifying agent is a betaine amphoteric ionic surfactant.

[0024] The experimental results show that the biomass synthetic base drilling fluid oil cleaning agent has good flushing effect, is suitable for a biomass synthetic base drilling fluid with a density of 0.8-2.3 g / cm 3 and a formation with a temperature of 120-180 DEG C, and has good environmental protection performance. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0026] The application provides a biomass synthetic base drilling fluid oil cleaning agent, which comprises:

[0027]

[0028] The penetrating agent is a sulfosuccinate salt and / or a polyoxyethylene ether compound;

[0029] The complexing agent is an organic phosphonate and / or a hydroxyl carboxylate;

[0030] The solubilizing agent is a de-aromatic hydrocarbon solvent oil;

[0031] The emulsifying agent is a betaine amphoteric ionic surfactant.

[0032] According to the present application, the content of the penetrating agent in the oil cleaning agent for biomass synthetic base drilling fluid is preferably 5-12 parts by weight, and more preferably 5-10 parts by weight; in some embodiments provided by the present application, the content of the penetrating agent in the oil cleaning agent for biomass synthetic base drilling fluid is specifically 5 parts by weight, 10 parts by weight, 8 parts by weight, 6 parts by weight or 7 parts by weight; the penetrating agent is a sulfosuccinate salt and / or a polyoxyethylene ether compound, which is a non-ionic or anionic surfactant, has a rapid penetration effect, and is beneficial to the destruction of the oil film and filter cake of the well wall; in the present application, the sulfosuccinate salt is preferably disodium sulfosuccinate di-sec-octyl ester; and the polyoxyethylene ether compound is preferably isomeric tridecanol polyoxyethylene ether.

[0033] According to the present application, the content of the complexing agent in the oil cleaning agent for biomass synthetic base drilling fluid is preferably 8-25 parts by weight, and more preferably 10-20 parts by weight; in some embodiments provided by the present application, the content of the complexing agent in the oil cleaning agent for biomass synthetic base drilling fluid is specifically 10 parts by weight, 12 parts by weight, 18 parts by weight, 15 parts by weight or 20 parts by weight; the complexing agent is an organic phosphonate and / or a hydroxyl carboxylate; the organic phosphonate is preferably sodium ethylenediamine tetramethylene phosphonate and / or diethylenetriamine pentamethylene phosphonate; and the hydroxyl carboxylate is preferably one or more of citric acid, sodium gluconate and sodium alginate; the complexing agent can combine with metal ions in the biomass synthetic base drilling fluid and the formation fluid, promote the destruction of the filter cake, and the separation of the oil film and filter cake after the destruction from the well wall, so that the oil film is no longer re-adhered to the well wall, and the cleaning effect is improved.

[0034] According to the present application, the content of the complexing agent in the oil cleaning agent for biomass synthetic base drilling fluid is preferably 8-25 parts by weight, and more preferably 10-20 parts by weight; in some embodiments provided by the present application, the content of the complexing agent in the oil cleaning agent for biomass synthetic base drilling fluid is specifically 10 parts by weight, 12 parts by weight, 18 parts by weight, 15 parts by weight or 20 parts by weight; the complexing agent is an organic phosphonate and / or a hydroxyl carboxylate; the organic phosphonate is preferably sodium ethylenediamine tetramethylene phosphonate and / or diethylenetriamine pentamethylene phosphonate; and the hydroxyl carboxylate is preferably one or more of citric acid, sodium gluconate and sodium alginate; the complexing agent can combine with metal ions in the biomass synthetic base drilling fluid and the formation fluid, promote the destruction of the filter cake, and the separation of the oil film and filter cake after the destruction from the well wall, so that the oil film is no longer re-adhered to the well wall, and the cleaning effect is improved.

[0035] According to the present application, the content of the emulsifier in the oil cleaning agent for biomass synthetic base drilling fluid is preferably 10-25 parts by weight, more preferably 10-20 parts by weight; in some embodiments provided by the present application, the content of the emulsifier in the oil cleaning agent for biomass synthetic base drilling fluid is specifically 10 parts by weight, 14 parts by weight, 18 parts by weight, 12 parts by weight or 20 parts by weight; the emulsifier is a betaine amphoteric ion surfactant, which has the effect of generating oil-in-water, can emulsify the oil film and filter cake entering the flushing fluid, and form stable emulsion; in the present application, the emulsifier is selected from one or more of cocamide propyl hydroxy sultaine, lauryl amide propyl betaine and lauryl amide propyl hydroxy sultaine.

[0036] The oil cleaning agent for biomass synthetic base drilling fluid of the present application adopts specific contents of components, and the components have good interaction with each other, so that the obtained oil cleaning agent for biomass synthetic base drilling fluid has good cleaning effect, and at the same time, the preferred raw material does not contain aromatic hydrocarbons, has biodegradability, is safe to the environment, and is conducive to environmental protection; and the oil-based drilling fluid oil cleaning agent has simple preparation method and mild conditions, and is suitable for large-scale industrial production.

[0037] The present application also provides a preparation method of the above-mentioned oil cleaning agent for biomass synthetic base drilling fluid, which comprises the following steps: S) mixing a penetrating agent, a complexing agent, a solubilizing agent, an emulsifier and water, and obtaining the oil cleaning agent for biomass synthetic base drilling fluid after reaction.

[0038] Among them, the source of all raw materials has no special restriction, which can be purchased on the market; the content and type of the penetrating agent, the complexing agent, the solubilizing agent and the emulsifier are the same as described above, and will not be repeated here.

[0039] The permeating agent, the complexing agent, the solubilizing agent, the emulsifying agent and water are mixed; the mixing method is well known to those skilled in the art and is not particularly limited; in the present application, the mixing is preferably carried out by stirring; the rotation speed of the mixing is preferably 300-1000 r / min, more preferably 400-800 r / min, more preferably 500-700 r / min, and most preferably 600 r / min; in the present application, the mixing is further preferably carried out according to the following steps: the permeating agent is mixed with water to carry out first stirring, then the complexing agent is added to carry out second stirring, the solubilizing agent is added to carry out third stirring, and the emulsifying agent is added to carry out fourth stirring; the rotation speed of the first stirring, the second stirring, the third stirring and the fourth stirring is independently preferably 300-1000 r / min, more preferably 400-800 r / min, more preferably 500-700 r / min, and most preferably 600 r / min; the time of the first stirring, the second stirring, the third stirring and the fourth stirring is independently preferably 5-20 min, more preferably 8-15 min, more preferably 8-12 min, and most preferably 10 min.

[0040] After mixing, reaction is carried out to obtain the clean oil agent for biomass synthesis-based drilling fluid; the reaction is preferably carried out under stirring; the rotation speed of the stirring is preferably 300-1000 r / min, more preferably 400-800 r / min, more preferably 500-700 r / min, and most preferably 500-600 r / min; the temperature of the reaction is preferably 30-50°C; in some embodiments provided by the present application, the temperature of the reaction is specifically 35°C, 30°C, 40°C or 50°C; the time of the reaction is preferably 0.5-2 h, more preferably 0.8-1.5 h, and more preferably 1-1.2 h.

[0041] The present application also provides an application of the clean oil agent for biomass synthesis-based drilling fluid in flushing the biomass synthesis-based drilling fluid.

[0042] The density of the biomass synthesis-based drilling fluid is preferably 0.8-2.3 g / cm 3 ; the temperature of the biomass synthesis-based drilling fluid is preferably 120-180°C.

[0043] The present application also provides a use method of the clean oil agent for biomass synthesis-based drilling fluid, which comprises mixing the clean oil agent for biomass synthesis-based drilling fluid with a cementing cleaning fluid.

[0044] The mass of the clean oil agent for biomass synthesis-based drilling fluid is preferably 10%-25% of the mass of the cementing cleaning fluid, and more preferably 10%-20%.

[0045] The cementing flushing fluid is a cementing flushing fluid known to those skilled in the art, and is not particularly limited, and in the embodiments provided in the present application, the cementing flushing fluid specifically comprises water and a suspending agent; the mass of the suspending agent is preferably 0.5% to 5% of the mass of the cementing flushing fluid, more preferably 1% to 3%, and still more preferably 2%.

[0046] In order to further illustrate the present application, the biomass-synthetic-based drilling fluid deoiling agent, the preparation method and application thereof provided by the present application are described in detail below in combination with examples.

[0047] The reagents used in the following examples are commercially available; the penetrant used in the examples is A1 sodium sulfosuccinimide provided by Nantong Yixun Chemical Technology Co., Ltd. or A2 isomeric tridecanol polyoxyethylene ether (E-1310); the complexing agent is B1 sodium ethylenediamine tetramethylene phosphonate provided by Zaozhuang Ziyang Environmental Protection Technology Co., Ltd., B2 sodium diethylenetriamine pentamethylene phosphonate; B3 citric acid and B4 sodium gluconate provided by Suzhou Changhong Chemical Co., Ltd.; B5 sodium alginate provided by Jiangsu Lunfeng Synthetic Technology Co., Ltd.; the solubilizing agent is C1 D60, C2 D80 and C3 D100 provided by Shandong Shengda Chemical Co., Ltd.; the emulsifier is D1 cocamidopropyl hydroxysultaine and D2 lauryl amidopropyl betaine provided by Linyi Green Forest Chemical Co., Ltd.

[0048] Example 1

[0049] (1) 5g of A1 was added to 100g of clean water, and stirred at a stirring rate of 600r / min for 10min.

[0050] (2) 10g of B1 was added to the liquid obtained in step (1), and stirred at a stirring rate of 600r / min for 10min.

[0051] (3) 2g of C1 was added to the liquid obtained in step (2), and stirred at a stirring rate of 600r / min for 10min.

[0052] (4) 10g of D1 was added to the liquid obtained in step (3), and stirred at a stirring rate of 600r / min for 10min.

[0053] (5) The solution obtained in step (4) was heated to 35℃, and the reaction was stirred at a stirring rate of 500r / min for 1.0h to obtain the biomass-synthetic-based drilling fluid deoiling agent.

[0054] Example 2

[0055] (1) 10g of A1 was added to 100g of clean water, and stirred at a stirring rate of 600r / min for 10min.

[0056] (2) To the liquid obtained in step (1), 12 g of B2 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0057] (3) To the liquid obtained in step (2), 2 g of C2 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0058] (4) To the liquid obtained in step (3), 10 g of D2 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0059] (5) The solution obtained in step (4) was heated to 30°C, and the reaction was carried out at a stirring rate of 500 r / min for 1.0 h to obtain the clear oil agent for the biomass synthesis based drilling fluid.

[0060] Example 3

[0061] (1) To 100 g of clean water, 8 g of A2 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0062] (2) To the liquid obtained in step (1), 18 g of B3 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0063] (3) To the liquid obtained in step (2), 3 g of C3 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0064] (4) To the liquid obtained in step (3), 14 g of D2 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0065] (5) The solution obtained in step (4) was heated to 40°C, and the reaction was carried out at a stirring rate of 500 r / min for 1.0 h to obtain the clear oil agent for the biomass synthesis based drilling fluid.

[0066] Example 4

[0067] (1) To 100 g of clean water, 6 g of A2 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0068] (2) To the liquid obtained in step (1), 15 g of B4 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0069] (3) To the liquid obtained in step (2), 4 g of C1 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0070] (4) To the liquid obtained in step (3), 18 g of D1 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0071] (5) The solution obtained in step (4) is warmed to 50°C, the stirring rate is 500 r / min, and the reaction time is 1.0 h to obtain the clean oil agent for the biomass synthesis-based drilling fluid.

[0072] Example 5

[0073] (1) 10 g of A1 is added to 100 g of clean water, and stirred at a stirring rate of 600 r / min for 10 min.

[0074] (2) 20 g of B5 is added to the liquid obtained in step (1), and stirred at a stirring rate of 600 r / min for 10 min.

[0075] (3) 4 g of C2 is added to the liquid obtained in step (2), and stirred at a stirring rate of 600 r / min for 10 min.

[0076] (4) 12 g of D1 is added to the liquid obtained in step (3), and stirred at a stirring rate of 600 r / min for 10 min.

[0077] (5) The solution obtained in step (4) is warmed to 40°C, the stirring rate is 500 r / min, and the reaction time is 1.0 h to obtain the clean oil agent for the biomass synthesis-based drilling fluid.

[0078] Example 6

[0079] (1) 8 g of A2 is added to 100 g of clean water, and stirred at a stirring rate of 600 r / min for 10 min.

[0080] (2) 15 g of B2 is added to the liquid obtained in step (1), and stirred at a stirring rate of 600 r / min for 10 min.

[0081] (3) 3 g of C1 is added to the liquid obtained in step (2), and stirred at a stirring rate of 600 r / min for 10 min.

[0082] (4) 18 g of D2 is added to the liquid obtained in step (3), and stirred at a stirring rate of 600 r / min for 10 min.

[0083] (5) The solution obtained in step (4) is warmed to 30°C, the stirring rate is 500 r / min, and the reaction time is 1.0 h to obtain the clean oil agent for the biomass synthesis-based drilling fluid.

[0084] Example 7

[0085] (1) 7 g of A2 is added to 100 g of clean water, and stirred at a stirring rate of 600 r / min for 10 min.

[0086] (2) To the liquid obtained in step (1), 12 g of B1 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0087] (3) To the liquid obtained in step (2), 5 g of C3 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0088] (4) To the liquid obtained in step (3), 20 g of D1 was added and stirred at a stirring rate of 600 r / min for 10 min.

[0089] (5) The solution obtained in step (4) was warmed to 50℃, and the reaction was stirred at a stirring rate of 500 r / min for 1.0 h to obtain the clean oil agent for biomass-synthesized base drilling fluid.

[0090] The performance of the clean oil agent for biomass-synthesized base drilling fluid prepared in Examples 1-7 was evaluated.

[0091] The flushing efficiency evaluation method of the clean oil agent for biomass-synthesized base drilling fluid:

[0092] (1) According to the circumference and height of the outer cylinder of the six-speed rotational viscometer, 80-mesh sandpaper was cut and fixed on the surface of the outer cylinder, weighed, and recorded as m1.

[0093] (2) The outer cylinder of the six-speed rotational viscometer in step (1) was immersed in the biomass-synthesized base drilling fluid, and the liquid surface was just above the upper edge of the sandpaper. After soaking for 5 min, it was taken out and weighed, recorded as m2.

[0094] (3) The flushing fluid was prepared using the clean oil agent for biomass-synthesized base drilling fluid.

[0095] (4) The outer cylinder with biomass-synthesized base drilling fluid adhered was installed on the six-speed rotational viscometer, and the flushing fluid was injected into the six-speed rotational viscometer sample cup to the scale line. The chassis was moved to make the flushing fluid level just coincide with the upper scale line of the outer cylinder. After rotating at a speed of 300 r / min for 8 min, the outer cylinder was removed and placed in a 105℃ oven for 2 h. It was weighed again and recorded as m3.

[0096] (5) The flushing efficiency calculation formula:

[0097] W = (m2-m3) x 100 / (m2-m1) (1)

[0098] Wherein: w is the flushing efficiency, %;

[0099] m1 is the total mass of the outer cylinder and sandpaper before soaking in the biomass-synthesized base drilling fluid, in g;

[0100] m2 is the mass after soaking in the biomass-synthesized base drilling fluid for 5 min, in g;

[0101] m3 - the mass of the rinsing liquid after 8 minutes of rinsing and 2 hours of drying, in g.

[0102] Rinsing efficiency of the biomass-synthesized drilling fluid deoiling agent prepared in Examples 1-7

[0103] Preparation method of the rinsing liquid: 400 mL of clean water was taken, 8 g of suspending agent (Puyang Minghua Chemical Co., Ltd., model M71S) was added, and then 40-80 g of the deoiling agent prepared in Examples 1-7 was added, and stirred at a high speed of 6000 r / min for 10 min. The experiment was performed according to the above rinsing efficiency evaluation method, and the biomass-synthesized drilling fluid for immersion of the outer cylinder of the six-speed rotational viscometer had a density of 2.0 g / cm 3 The experimental results of Examples 1-7 are shown in Table 1.

[0104] Table 1 Rinsing efficiency of the biomass-synthesized drilling fluid deoiling agent prepared in Examples 1-7

[0105] Example Amount, g Rinse efficiency, % 1 40 92.5 2 60 93.8 3 60 93.6 4 60 95.7 5 60 98.6 6 72 98.4 7 80 96.2

[0106] As shown in Table 1, the deoiling agent prepared in Examples 1-7 can meet the rinsing needs of the biomass-synthesized drilling fluid with a density of 2.0 g / cm 3 , and the rinsing efficiency is more than 90%, which has good rinsing effect.

[0107] Performance evaluation of the rinsing efficiency of the deoiling agent prepared in Example 5 with different amounts: 400 mL of clean water was taken, 8 g of suspending agent (Puyang Minghua Chemical Co., Ltd., model M71S) was added, and then different amounts of the deoiling agent prepared in Example 5 were added, and stirred at a high speed of 6000 r / min for 10 min. The experiment was performed according to the above rinsing efficiency evaluation method, and the results are shown in Table 2. The biomass-synthesized drilling fluid for immersion of the outer cylinder of the six-speed rotational viscometer was prepared in Example 8 of the Chinese patent with publication number CN 110872493 A, and the density of the biomass-synthesized drilling fluid was adjusted by adding different amounts of barite to be 0.8-2.3 g / cm 3 .

[0108] Table 2 Rinsing efficiency of Example 5 with different amounts

[0109]

[0110]

[0111] As shown in Table 2, the biomass-synthesized drilling fluid deoiling agent prepared in Example 5 has good rinsing effect on the biomass-synthesized drilling fluid with a density of 0.8-2.3 g / cm 3The biomass synthetic base drilling fluid has good flushing effect, and the flushing efficiency is more than 90%.

[0112] The flushing efficiency of the oil cleaning agent for the biomass synthetic base drilling fluid prepared in Example 5 under different temperature conditions is evaluated: 400 mL of clean water is taken, 8 g of suspending agent (Puyang Minghua Chemical Co., Ltd., model M71S) is added, and 60 g of the oil cleaning agent (Example 5) is added, and stirred at a high speed of 6000 r / min for 10 min. The obtained test solution is placed in a constant temperature water bath, and the temperature is controlled to 30 DEG C, 60 DEG C and 90 DEG C respectively. The experiment is carried out according to the flushing efficiency evaluation method, and the results are shown in Table 3. The density of the biomass synthetic base drilling fluid used for immersing the outer cylinder of the six-speed rotational viscometer is 2.0 g / cm 3 .

[0113] Table 3: Flushing efficiency under different temperature conditions

[0114] Rinse temperature, °C Rinse efficiency, % 30 93.4 60 95.8 90 99.2

[0115] As shown in Table 3, the flushing efficiency of the oil cleaning agent for the biomass synthetic base drilling fluid prepared in Example 5 increases with the increase of temperature, and has good flushing effect.

[0116] The temperature resistance of the oil cleaning agent for the biomass synthetic base drilling fluid prepared in Example 5 is evaluated: 400 mL of clean water is taken, 8 g of suspending agent (Puyang Minghua Chemical Co., Ltd., model M71S) is added, and 60 g of the oil cleaning agent for the biomass synthetic base drilling fluid prepared in Example 5 is added, and stirred at a high speed of 6000 r / min for 10 min. The obtained test solution is rolled and aged at 120 DEG C, 150 DEG C and 180 DEG C for 6 h respectively, and then cooled to room temperature. The experiment is carried out according to the flushing efficiency evaluation method, and the results are shown in Table 4. The density of the biomass synthetic base drilling fluid used for immersing the outer cylinder of the six-speed rotational viscometer is 2.0 g / cm 3 .

[0117] Table 4: Flushing efficiency after aging

[0118]

[0119]

[0120] As shown in Table 4, the flushing efficiency of the oil cleaning agent for the biomass synthetic base drilling fluid prepared in Example 5 is more than 90% after high temperature aging, which can meet the needs of cementing after using the biomass synthetic base drilling fluid for deep well drilling.

[0121] The salt resistance of the oil cleaning agent prepared in Example 5 was evaluated: 400 mL of clean water was taken, 20 g, 40 g, 60 g, 100 g, 120 g, 144 g of NaCl or 2 g, 4 g, 8 g of CaCl2 was added respectively, after dissolution, 8 g of suspending agent (Puyang Minghua Chemical Co., Ltd., model M71S) was added, 60 g of the biomass synthesis-based drilling fluid cleaning oil prepared in Example 5 was added, and stirred at a high speed of 6000 r / min for 10 min. The experiment was carried out according to the flushing efficiency evaluation method, and the results are shown in Table 5. The density of the biomass synthesis-based drilling fluid used for soaking the outer cylinder of the six-speed rotational viscometer was 2.0 g / cm 3 .

[0122] Table 5 Evaluation results of salt resistance

[0123] Salt amount Rinse efficiency, % 20 g NaCI 97.6 40 g NaCI 96.2 60 g NaCI 94.6 100 g NaCI 93.8 144 g NaCI 92.5 2 g CaCl2 93.8 4 g CaCl2 93.4 8 g CaCl2 92.4

[0124] As can be seen from the results in Table 5, the flushing efficiency of the biomass synthesis-based drilling fluid cleaning oil prepared in Example 5 using different concentrations of NaCl and CaCl2 salt water to prepare the flushing fluid is more than 90%, which has good flushing effect and can meet the requirements of the flushing fluid for shale formation.

[0125] The biotoxicity evaluation experiment of the biomass synthesis-based drilling fluid cleaning oil provided by the application is based on the national standard GB / T 15441-1995 “Determination of Acute Toxicity of Water Quality by Luminescent Bacteria Method”, and the toxicity of Examples 1-7 is determined; the biodegradability of Examples 1 and 5 is determined by BOD5 / COD Cr Method, using DXY-2 type biological acute toxicity tester, referring to the standard of Daphnia magna biological toxicity classification confirmed by the U.S. Environmental Protection Agency, the experimental results are shown in Table 6. As can be seen from Table 6, the cleaning oil provided by the application has no biological toxicity and strong biodegradability, which is beneficial to environmental protection.

[0126] Table 6 Toxicity experiment of the cleaning oil

[0127] Example EC 50 , mg / L BOD5 / COD Cr ]] 1 4.2 x 10 4 ]]> 0.53 2 3.9 x 10 4 ]] -- 3 3.7 x 10 4 ]]> -- 4 3.65 x 10 4 ]]> -- 5 3.72 x 10 4 ]] 0.50 6 3.64 x 10 4 ]] -- 7 3.5 x 10 4 ]]> --

[0128] Comparative Example 1

[0129] According to the preparation method provided in Example 5, the biomass synthesis-based drilling fluid cleaning oil was obtained; the difference lies in that the penetrating agent used in Comparative Example 1 is alkali-resistant penetrating agent OEP-70 (provided by Nantong Yixun Chemical Co., Ltd.).

[0130] Comparative Example 2

[0131] According to the preparation method provided in Example 5, the biomass synthesis-based drilling fluid cleaning oil was obtained; the difference lies in that the complexing agent used in Comparative Example 2 is tartaric acid (provided by Suzhou Changhong Chemical Co., Ltd.).

[0132] Comparative Example 3

[0133] According to the preparation method provided in Example 5, the biomass-synthesized drilling fluid deoiling agent was obtained; the difference is that no solubilizing agent is added in Comparative Example 3.

[0134] Comparative Example 4

[0135] According to the preparation method provided in Example 5, the biomass-synthesized drilling fluid deoiling agent was obtained; the difference is that the emulsifier in Comparative Example 4 is changed to sodium dodecyl sulfate K12 powder (provided by Linyi Green Forest Chemical Co., Ltd.).

[0136] 400 mL of water was taken, 8 g of suspending agent (Puyang Minghua Chemical Co., Ltd., model M71S) was added, and 60 g of biomass-synthesized drilling fluid deoiling agent prepared in Comparative Examples 1-4 or Example 5 was added, respectively, and stirred at a high speed of 6000 r / min for 10 min. The obtained test solution was placed in a constant temperature water bath, and the temperature was controlled to 30℃. The experiment was carried out according to the flushing efficiency evaluation method, and the results are shown in Table 7. The biomass-synthesized drilling fluid with a density of 2.0 g / cm 3 .

[0137] Table 7 flushing efficiency of Comparative Examples 1-4 and Example 5

[0138] Rinse efficiency, % Comparative Example 1 35.4 Comparative Example 2 22.3 Comparative Example 3 24.8 Comparative Example 4 43.1 Example 5 94.4

[0139] As can be seen from Table 7, by comparing the data of Example 5 and Comparative Examples 1-4, it can be seen that the specific penetrant, complexing agent, solubilizing agent and emulsifier used in the present application have good synergies, and can make the deoiling agent provided by the present application have better performance.

[0140] The preferred embodiments of the present application disclosed above are only used to help explain the present application, but the present application is not limited thereto. Those skilled in the art can understand that within the technical concept of the present application, the technical solutions of the present application can be modified, or some technical features can be combined in any other way, and these modifications or combinations do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be considered as the disclosed content of the present application, which belongs to the protection scope of the present application.

Claims

1. A deoiling agent for a biomass-synthetic base drilling fluid, characterized by comprising: Comprising: penetrant 2~15 parts by weight; complexing agent 5~30 parts by weight; dissolution promoter 1~10 parts by weight; emulsifier 8~30 parts by weight; water 100 parts by weight; The penetrant is selected from one or more of sodium sulfosuccinic acid di-sec-octyl ester and / or isomeric tridecanol polyoxyethylene ether; The complexing agent is selected from one or more of ethylenediamine tetramethylene phosphonic acid sodium salt, diethylene triamine penta-methylene phosphonic acid salt, citric acid, sodium gluconate and sodium alginate; The dissolution promoter is selected from one or more of D60, D80 and D100; The emulsifier is selected from one or more of cocamide propyl hydroxyl sulfobetaine, lauramide propyl betaine and lauramide propyl hydroxyl sulfobetaine.

2. A method for preparing a cleaning agent for biomass-based drilling fluid as described in claim 1, characterized in that, Comprising the following steps: S) mixing the penetrant, complexing agent, dissolution promoter, emulsifier and water, and after reaction, obtaining a clean oil agent for biomass synthesis based drilling fluid.

3. The preparation method according to claim 2, characterized in that, The step S) is specifically: Mixing the penetrant and water for the first stirring, then adding the complexing agent for the second stirring, adding the dissolution promoter for the third stirring, adding the emulsifier for the fourth stirring, and after reaction, obtaining a clean oil agent for biomass synthesis based drilling fluid.

4. The production method according to claim 3, characterized by, The rotation speed of the first stirring, the second stirring, the third stirring and the fourth stirring is independently 300~1000 r / min; The time of the first stirring, the second stirring, the third stirring and the fourth stirring is independently 5~20 min; The reaction temperature is 30℃~50℃; The reaction time is 0.5~2 h.

5. A method of using the oil clarifier of claim 1 for a biomass synthetic base drilling fluid, characterized by, Comprising: Mixing the clean oil agent for biomass synthesis based drilling fluid and the cementing cleaning fluid.

6. The method of use of claim 5, wherein, The mass of the clean oil agent for biomass synthesis based drilling fluid is 10%~25% of the mass of the cementing cleaning fluid.

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