High temperature resistant coated sand for oil well sand control and preparation method thereof

Abstract

The invention discloses a high temperature resistant coated sand for oil well sand control and a preparation method thereof, wherein rosin and epoxy soybean oil are reacted to obtain rosin modified epoxy resin; thermoplastic phenolic resin and rosin modified epoxy resin are reacted to obtain epoxy modified phenolic resin; epoxy modified phenolic resin is dissolved in a solvent, and an organic silane coupling agent is added to react to obtain organosilicon modified epoxy phenolic resin; organosilicon modified epoxy phenolic resin, quartz sand and a curing agent are heated and mixed to obtain high temperature resistant coated sand for oil well sand control. The high temperature resistant coated sand for oil well sand control obtained by the invention has strong temperature resistance and medium resistance.

Description

Technical Field

[0001] This invention relates to high-temperature resistant coated sand for sand control in oil wells and its preparation method, belonging to the field of petroleum exploration technology. Background Art

[0002] For heavy oil reservoirs, gas injection is often used for development. However, high-temperature and high-pressure steam injection for intensive extraction, the high pH value of high-temperature steam, and changes in the physical form of steam can easily damage the reservoir structure. These problems can induce and exacerbate sand production in the formation. In addition, sand production can lead to erosion of downhole and surface equipment, and changes in in-situ stress can cause damage to the formation framework, easily leading to casing deformation and even well abandonment, seriously affecting the overall efficiency of oilfield development.

[0003] As the exploitation of loose oil reservoirs continues, formation sand production has become a serious constraint on daily production in oilfields. Sand production in oil wells reduces well productivity and can damage casing, causing deformation or rupture, and even leading to the well's abandonment. Sand production in water injection wells can cause sand burial, preventing water injection and potentially leading to well abandonment or incomplete injection and production in the area. Therefore, necessary sand control measures can maximize the prevention of formation sand migration, thereby avoiding wellbore damage. Currently, the main sand control technologies available domestically and internationally include mechanical sand control, chemical sand control, composite sand control, and other sand control methods. These technologies have solved the problem of sand control in oil and water wells to varying degrees, while also reducing equipment maintenance costs and increasing economic benefits.

[0004] Chinese patent CN115558480A discloses a sand-resistant coating and its preparation method, comprising modified glass fiber, binder resin, and quartz sand; the surface of the modified glass fiber is coated with a carbonized layer; silica particles are adsorbed in the carbonized layer; the modified glass fiber and the carbonized layer, as well as the silica particles and the carbonized layer, are connected by Si-C chemical bonds. Additionally, it includes a low-crosslinked polyethyleneimine resin; the low-crosslinked polyethyleneimine resin is obtained by introducing 3-5% (by weight of the polyethyleneimine resin) of carbon dioxide gas into the polyethyleneimine resin. Although the obtained sand-resistant coating effectively improves the strength of the resin-coated sand, its use under high-temperature conditions is limited.

[0005] Therefore, developing a type of coated sand for oil well sand control that is resistant to high temperatures and various media (acids, alkalis, salts, strong oxidants, and oil) is very important for oilfield development. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a high-temperature resistant coated sand for oil well sand control and its preparation method. The high-temperature resistant coated sand for oil well sand control is prepared by adding natural resources and has strong high temperature resistance and media resistance.

[0007] To solve the above-mentioned technical problems, the present invention provides a high-temperature resistant coated sand for oil well sand control, characterized in that it comprises the following components in parts by weight:

[0008] 1-10 parts of organosilicon-modified epoxy phenolic resin;

[0009] 90-100 parts of quartz sand;

[0010] Hardener 0.1~1 part;

[0011] The raw materials for preparing the organosilicon-modified epoxy phenolic resin include: rosin, epoxidized soybean oil, thermoplastic phenolic resin, and organosilicon coupling agent.

[0012] Preferably, the curing agent is a ketimine-based curing agent.

[0013] Meanwhile, the present invention also provides a method for preparing high-temperature resistant coated sand for oil well sand control, comprising the following steps:

[0014] A. Rosin and epoxidized soybean oil are reacted in the presence of a catalyst for 2-5 hours to obtain rosin-modified epoxy resin;

[0015] B. Thermoplastic phenolic resin and rosin-modified epoxy resin are reacted for 2-5 hours to obtain epoxy-modified phenolic resin;

[0016] C. Dissolve epoxy-modified phenolic resin in a solvent, add organosilane coupling agent to react, and obtain organosilicon-modified epoxy phenolic resin;

[0017] D. Mix organosilicon-modified epoxy phenolic resin, quartz sand, and curing agent to obtain high-temperature resistant coated sand for oil well sand control.

[0018] Preferably, the rosin is at least one of propylene piratic acid, maleic piratic acid, or fumaric piratic acid.

[0019] Preferably, the reaction temperature in step A is 100~150℃, the catalyst is benzyltriethylammonium chloride, and the mass ratio of rosin to epoxidized soybean oil is 1:3~1:10.

[0020] Preferably, the reaction temperature in step B is 120~160℃, and the mass ratio of the thermoplastic phenolic resin, rosin-modified epoxy resin, and epoxidized soybean oil is 1:3~1:5.

[0021] Preferably, the organosilane coupling agent is at least one of KH550, KH560 or KH570.

[0022] Preferably, the solvent in step C is acetone, the reaction temperature is 120~160℃, and the reaction time is 4~6h.

[0023] Preferably, the mixing temperature in step D is 25~45℃.

[0024] The beneficial effects achieved by the present invention are:

[0025] (1) A high-temperature resistant coated sand for oil well sand control in this invention utilizes natural products to modify thermoplastic phenolic resin to obtain epoxy-modified phenolic resin, and further reacts it with organosilane coupling agent, quartz sand and curing agent to obtain high-temperature resistant coated sand for oil well sand control, which has strong temperature resistance and media resistance.

[0026] (2) A method for preparing high-temperature resistant coated sand for oil well sand control according to the present invention, wherein rosin-modified epoxy resin is obtained by reacting rosin and epoxidized soybean oil, and then reacted with thermoplastic phenolic resin and organosilane coupling agent in sequence to obtain organosilicon-modified epoxy phenolic resin. The high-temperature resistant coated sand for oil well sand control obtained by reacting organosilicon-modified epoxy phenolic resin with quartz sand and ketimine curing agent has a high thermal decomposition temperature, which can reach 375°C, and can be applied to high-temperature environments. The consolidated core obtained by loading it into an artificial core mold has strong compressive strength and permeability. At the same time, compared with phenolic resin for oil well sand control, after soaking in 10% hydrochloric acid, 5% NaOH, saturated brine, 0.5% K2S2O8 and diesel solution for 15 days, the consolidated core obtained by the high-temperature resistant coated sand for oil well sand control according to the present invention still has strong compressive strength and has resistance to media (acid resistance, alkali resistance, salt resistance, strong oxidant resistance, oil resistance). Meanwhile, the high-temperature resistant coated sand for oil well sand control prepared using fumaric acid as a raw material exhibits the best performance. This is because the phenanthrene ring structure in fumaric acid not only gives the high-temperature resistant coated sand for oil well sand control good temperature resistance, but also its high carboxyl content in its functional groups results in a high degree of cross-linking and curing of the organosilicon-modified epoxy phenolic resin in the consolidated core, thus possessing strong compressive strength and permeability. The compressive strength can reach 10.39 MPa, while the permeability can reach 27.33 μm. 2 . Detailed Implementation

[0027] The present invention will be further described below. The following examples are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0028] Take 5-8 mg of sample and perform TGA analysis on the sample. Under nitrogen protection, the temperature is increased from room temperature to 800℃ at a rate of 10℃ / min.

[0029] The testing methods for compressive strength and permeability shall refer to SY / T5276-2000 Determination of Flexural Strength, Compressive Strength and Gas Permeability of Chemically Released Sand.

[0030] The samples were immersed in 10% hydrochloric acid, 5% NaOH, saturated salt water, 0.5% K2S2O8 and diesel oil solutions for 15 days respectively. Then, their compressive strength was measured and their resistance to acid, alkali, salt, strong oxidant and oil was evaluated. Example 1

[0031] A high-temperature resistant coated sand for sand control in oil wells, comprising the following components:

[0032] Organosilicon-modified epoxy phenolic resin 60g;

[0033] 1000g of quartz sand;

[0034] Ketoimine curing agent 6g;

[0035] A method for preparing high-temperature resistant coated sand for sand control in oil wells includes the following steps:

[0036] A. 50g fumaric acid, 250g epoxidized soybean oil, and 5g benzyltriethylammonium chloride were stirred and reacted at 120℃ for 3h to obtain 282g rosin-modified epoxy resin.

[0037] B. 60g of thermoplastic phenolic resin and 240g of rosin-modified epoxy resin were heated at 140℃ for 3h to obtain 279g of epoxy-modified phenolic resin.

[0038] C. Dissolve 250g of epoxy-modified phenolic resin in 1L of acetone, add 5g of organosilane coupling agent KH550 and react to obtain organosilicon-modified epoxy phenolic resin.

[0039] D. Mix 60g of organosilicon-modified epoxy phenolic resin, 1000g of quartz sand, and 6g of ketimine curing agent at 35℃ to obtain high-temperature resistant coated sand for oil well sand control.

[0040] The performance test data of the high-temperature resistant coated sand for oil well sand control are shown in Table 1.

[0041] The obtained high-temperature resistant coated sand for oil well sand control was loaded into an artificial core mold and cured at 150℃ for 2 hours and at 200℃ for 4 hours to obtain consolidated cores. The performance test data of the obtained consolidated cores are shown in Table 1. Example 2

[0042] A high-temperature resistant coated sand for sand control in oil wells, comprising the following components:

[0043] 100g of organosilicon-modified epoxy phenolic resin;

[0044] 1000g of quartz sand;

[0045] 10g of ketimine curing agent;

[0046] A method for preparing high-temperature resistant coated sand for sand control in oil wells includes the following steps:

[0047] A. 50g fumaric acid, 500g epoxidized soybean oil, and 10g benzyltriethylammonium chloride were stirred and reacted at 150℃ for 5h to obtain 489g rosin-modified epoxy resin.

[0048] B. 60g of thermoplastic phenolic resin and 300g of rosin-modified epoxy resin were heated at 160℃ for 5h to obtain 344g of epoxy-modified phenolic resin.

[0049] C. Dissolve 250g of epoxy-modified phenolic resin in 1L of acetone, add 5g of organosilane coupling agent KH550 and react to obtain organosilicon-modified epoxy phenolic resin.

[0050] D. Mix 100g of organosilicon-modified epoxy phenolic resin, 1000g of quartz sand, and 10g of ketimine curing agent at 45℃ to obtain high-temperature resistant coated sand for oil well sand control.

[0051] The obtained high-temperature resistant coated sand for oil well sand control was loaded into an artificial core mold and cured at 150℃ for 2 hours and at 200℃ for 4 hours to obtain consolidated cores. The performance test data of the obtained consolidated cores are shown in Table 1. Example 3

[0052] A high-temperature resistant coated sand for sand control in oil wells, comprising the following components:

[0053] 10g of organosilicon-modified epoxy phenolic resin;

[0054] 1000g of quartz sand;

[0055] 1g of ketimine curing agent;

[0056] A method for preparing high-temperature resistant coated sand for sand control in oil wells includes the following steps:

[0057] A. 50g fumaric acid, 150g epoxidized soybean oil, and 4g benzyltriethylammonium chloride were stirred and reacted at 100℃ for 2h to obtain 190g rosin-modified epoxy resin.

[0058] B. 60g of thermoplastic phenolic resin and 180g of rosin-modified epoxy resin were heated at 120℃ for 2h to obtain 230g of epoxy-modified phenolic resin.

[0059] C. Dissolve 230g of epoxy-modified phenolic resin in 1L of acetone, add 4g of organosilane coupling agent KH550 and react to obtain organosilicon-modified epoxy phenolic resin.

[0060] D. Mix 10g of organosilicon-modified epoxy phenolic resin, 1000g of quartz sand, and 1g of ketimine curing agent at 25℃ to obtain high-temperature resistant coated sand for oil well sand control.

[0061] The obtained high-temperature resistant coated sand for oil well sand control was loaded into an artificial core mold and cured at 150℃ for 2 hours and at 200℃ for 4 hours to obtain consolidated cores. The performance test data of the obtained consolidated cores are shown in Table 1. Example 4

[0062] A high-temperature resistant coated sand for sand control in oil wells, comprising the following components:

[0063] Organosilicon-modified epoxy phenolic resin 60g;

[0064] 1000g of quartz sand;

[0065] Ketoimine curing agent 6g;

[0066] A method for preparing high-temperature resistant coated sand for sand control in oil wells includes the following steps:

[0067] A. 50g of maleic acrid acid, 250g of epoxidized soybean oil, and 5g of benzyltriethylammonium chloride were stirred and reacted at 120℃ for 3h to obtain 282g of rosin-modified epoxy resin.

[0068] B. 60g of thermoplastic phenolic resin and 240g of rosin-modified epoxy resin were heated at 140℃ for 3h to obtain 279g of epoxy-modified phenolic resin.

[0069] C. Dissolve 250g of epoxy-modified phenolic resin in 1L of acetone, add 5g of organosilane coupling agent KH550 and react to obtain organosilicon-modified epoxy phenolic resin.

[0070] D. Mix 60g of organosilicon-modified epoxy phenolic resin, 1000g of quartz sand, and 6g of ketimine curing agent at 35℃ to obtain high-temperature resistant coated sand for oil well sand control.

[0071] The obtained high-temperature resistant coated sand for oil well sand control was loaded into an artificial core mold and cured at 150℃ for 2 hours and at 200℃ for 4 hours to obtain consolidated cores. The performance test data of the obtained consolidated cores are shown in Table 1. Example 5

[0072] A high-temperature resistant coated sand for sand control in oil wells, comprising the following components:

[0073] Organosilicon-modified epoxy phenolic resin 60g;

[0074] 1000g of quartz sand;

[0075] Ketoimine curing agent 6g;

[0076] A method for preparing high-temperature resistant coated sand for sand control in oil wells includes the following steps:

[0077] A. 50g of propylene pinoic acid, 250g of epoxidized soybean oil, and 5g of benzyl triethyl ammonium chloride were stirred and reacted at 120℃ for 3h to obtain 282g of rosin-modified epoxy resin.

[0078] B. 60g of thermoplastic phenolic resin and 240g of rosin-modified epoxy resin were heated at 140℃ for 3h to obtain 279g of epoxy-modified phenolic resin.

[0079] C. Dissolve 250g of epoxy-modified phenolic resin in 1L of acetone, add 5g of organosilane coupling agent KH550 and react to obtain organosilicon-modified epoxy phenolic resin.

[0080] D. Mix 60g of organosilicon-modified epoxy phenolic resin, 1000g of quartz sand, and 6g of ketimine curing agent at 35℃ to obtain high-temperature resistant coated sand for oil well sand control.

[0081] The obtained high-temperature resistant coated sand for oil well sand control was loaded into an artificial core mold and cured at 150℃ for 2 hours and at 200℃ for 4 hours to obtain consolidated cores. The performance test data of the obtained consolidated cores are shown in Table 1.

[0082] Comparative Example

[0083] 60g of thermoplastic phenolic resin, 5g of organosilane coupling agent KH550, 1000g of quartz sand, and 6g of ketimine curing agent were mixed at 35℃ to obtain phenolic resin for sand control in oil wells.

[0084] The obtained phenolic resin for oil well sand control was filled into an artificial core mold and cured at 150℃ for 2 hours and at 200℃ for 4 hours to obtain consolidated cores. The performance test data of the obtained consolidated cores are shown in Table 1.

[0085] Table 1 Performance Tests

[0086]

[0087] As shown in Table 1, the rosin-modified epoxy resin obtained by reacting rosin and epoxidized soybean oil, and then reacted sequentially with thermoplastic phenolic resin and organosilane coupling agent to obtain organosilicon-modified epoxy phenolic resin, produces high-temperature resistant coated sand for oil well sand control with quartz sand and ketimine curing agent. This high-temperature resistant coated sand has a high thermal decomposition temperature, reaching 375℃, and can be applied in high-temperature environments. The consolidated core obtained by loading it into an artificial core mold has strong compressive strength and permeability. Compared with phenolic resin for oil well sand control, the consolidated core obtained by the high-temperature resistant coated sand for oil well sand control of the present invention still has strong compressive strength and resistance to media (acid, alkali, salt, strong oxidant, and oil) after soaking in 10% hydrochloric acid, 5% NaOH, saturated brine, 0.5% K2S2O8, and diesel solution for 15 days. Meanwhile, the high-temperature resistant coated sand for oil well sand control prepared using fumaric acid as a raw material exhibits the best performance. This is because the phenanthrene ring structure in fumaric acid not only gives the high-temperature resistant coated sand for oil well sand control good temperature resistance, but also its high carboxyl content in its functional groups results in a high degree of cross-linking and curing of the organosilicon-modified epoxy phenolic resin in the consolidated core, thus possessing strong compressive strength and permeability. The compressive strength can reach 10.39 MPa, while the permeability can reach 27.33 μm. 2 .

[0088] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high temperature resistant coated sand for oil well sand control, characterized in that: The composition comprises the following components in parts by weight: 1-10 parts of silicone modified epoxy phenolic resin; 90~100 parts of quartz sand; Curing agent 0.1~1 part; The raw materials for preparing the organosilicon-modified epoxy phenolic resin include: rosin, epoxy soybean oil, thermoplastic phenolic resin, and organosilane coupling agent; The method for preparing the high temperature resistant coated sand for oil well sand control comprises the following steps: A. react rosin and epoxidized soybean oil in the presence of a catalyst for 2 to 5 hours to obtain rosin-modified epoxy resin; B. Thermoplastic phenolic resin and rosin-modified epoxy resin react for 2 to 5 hours to obtain epoxy-modified phenolic resin; C. dissolving the epoxy modified phenolic resin in a solvent, adding an organic silane coupling agent to react, and obtaining an organic silicon modified epoxy phenolic resin; D. mixing organosilicon-modified epoxy phenolic resin, quartz sand and curing agent to obtain high temperature resistant coated sand for oil well sand control; The mass ratio of the rosin to the epoxidized soybean oil is 1:3 to 1:10; The mass ratio of the thermoplastic phenolic resin to the rosin-modified epoxy resin and epoxy soybean oil is 1:3-1:

5.

2. The high temperature resistant coated sand for oil well sand control according to claim 1 is characterized in that: The curing agent is a ketimine curing agent.

3. The high temperature resistant coated sand for oil well sand control according to claim 1 is characterized in that: The rosin is at least one of acrylopimaric acid, maleopimaric acid or fumaric pimaric acid.

4. The high temperature resistant coated sand for oil well sand control according to claim 1 is characterized in that: The reaction temperature in step A is 100-150° C., and the catalyst is benzyltriethylammonium chloride.

5. The high temperature resistant coated sand for oil well sand control according to claim 1, wherein the reaction temperature in step B is 120-160°C.

6. The high temperature resistant coated sand for oil well sand control according to claim 1, wherein the organic silane coupling agent is at least one of KH550, KH560 or KH570.

7. The high temperature resistant coated sand for oil well sand control according to claim 1, wherein the solvent in step C is acetone, the reaction temperature is 120-160°C, and the reaction time is 4-6 hours.

8. The high temperature resistant coated sand for oil well sand control according to claim 1, wherein the mixing temperature in step D is 25-45°C.

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