CN111440001A - Curing agent for making bricks after curing water-based drilling cuttings as well as preparation method and application of curing agent - Google Patents
Curing agent for making bricks after curing water-based drilling cuttings as well as preparation method and application of curing agent Download PDFInfo
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- CN111440001A CN111440001A CN202010340598.4A CN202010340598A CN111440001A CN 111440001 A CN111440001 A CN 111440001A CN 202010340598 A CN202010340598 A CN 202010340598A CN 111440001 A CN111440001 A CN 111440001A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/6303—Inorganic additives
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Abstract
The invention provides a curing agent for making bricks after curing water-based drilling cuttings, a preparation method and application thereof, and relates to the technical field of environmental protection treatment of water-based drilling cuttings in oil fields. The curing agent uses industrial waste residues such as coal gangue and the like, treats waste with waste, introduces plant shell and solid surfactant, solves the problems of easy cracking, high moisture, bonding and the like when the water-based drilling cuttings are cured and used for preparing the baked bricks, is favorable for recycling cured substances of the water-based drilling cuttings for preparing the baked bricks, and has practical value and popularization prospect.
Description
Technical Field
The invention relates to the technical field of environment-friendly treatment of water-based drilling cuttings in oil fields, in particular to a curing agent for making bricks after the water-based drilling cuttings are cured, and a preparation method and application thereof.
Background
The water-based drilling cuttings are wastes which are necessary to be generated in the using process of the water-based drilling fluid, according to the gelling mechanism of the drilling fluid, the clay minerals are substituted by crystal lattices, so that the surfaces of the clay minerals are negatively charged, under the alkaline condition, a hydration film is easily formed on the surfaces of the clay, and under the action of electrostatic repulsion, clay particles and an aqueous solution form a stable colloid dispersion system; the high molecular materials (such as KPAM, CMC, SMP, etc.) are ionized into groups with negative charges in water, and the molecular morphology is stretched due to the action of the charges, which is favorable for the high molecular materials, the clay and the water to form stable drilling fluid colloid together. Therefore, the water-based drill cuttings contain a large amount of drilling fluid, drilling fluid additives and the like, and also have certain colloid performance, the colloid structure formed by the drill cuttings and water is difficult to damage, and the water content of the untreated water-based drill cuttings is more than 80 percent or even higher.
Brick making is one of the effective resource methods of water-based drilling cuttings, and is widely applied in regions such as Sichuan and Chongqing at present. In the preparation of the raw materials of the baked brick, the raw materials have higher limit requirements on CaO, sulfuric anhydride and magnesium oxide, and the raw materials for preparing the common baked brick require 55 to 75 percent of SiO2、3％～10％Fe2O3、10％～20％Al2O3、SO3Less than 3 percent, less than 10 percent of CaO, less than 3 percent of MgO and 3 to 15 percent of loss on ignition. Wherein CaO is often present in the raw materials in the form of calcium carbonate, which is a harmful component in the preparation of the baked brick, and when the content thereof exceeds 10%, not only the sintering temperature range of the product is narrowed, but also the baking is difficult. When the brick-making raw material contains more calcareous material (CaCO)3) And when the crushed raw material particles are large, quicklime (CaO) particles with large sizes are formed in the brick body in the roasting process. The quicklime particles continuously absorb water in the air and are gradually hydrated into slaked lime Ca (OH)2. The process of hydration of CaO to form slaked lime is a process of volume expansion. As CaO is continuously hydrated into slaked lime, the volume of CaO aggregate in the brick body is continuously increased, the tensile stress generated by the expansion of the CaO aggregate borne by the brick body is also increased, and when the pressure is greater than the tensile strength of the brick body, the brick body is damaged. A small amount of CaO aggregates can form surface damage of the brick body, and a large amount of CaO aggregates can cause the brick body to crack. In the drilling process, the water content of the water-based drilling cuttings is generally more than 80%, the water content of the drilling cuttings pulled and transported to a brickyard is required to be lower than 60%, and the water-based drilling cuttings are reduced to the greatest extent and are bonded, so that the transported materials are damaged and screen holes are blocked due to the increase of the viscosity of raw materials.
Therefore, the water-based drilling cuttings are used for making bricks after being cured, and at least the following requirements are met for the curing agent:
(1) CaO and CaCO are not suitable to be directly added3The main components added in the curing agent have little or no influence on the raw material components of the baked brick as much as possible, and the loss of the added materials is small;
(2) the water-based drilling cuttings after solidification have lower water content as much as possible, and the water content is less than 60%;
(3) the solidified water-based drilling cuttings are prevented from being adhered into blocks and lumps, the water-based drilling cuttings can be in a coarse sand shape, and the pores are developed to facilitate evaporation of internal water. And the cured product is easy to bond.
The existing water-based drilling cutting curing agent mainly has the following problems:
(1) the existing curing agent selects a large amount of CaO directly added or CaCO added into clinker for the reasons that the leached liquid phase can be reused for preparing drilling fluid or the CaO generates Ca (OH)2 with water, has large water absorption amount and accelerates the water evaporation along with the heat release phenomenon when the CaO is in contact with the water during the treatment of high-liquid-content water-based rock debris3The cement is used as a raw material, and the brick body is easy to crack due to excessive CaO in the brick making raw material;
(2) the water-based drilling cuttings are high in viscosity components, easy to adhere together with the addition of the curing agent and mostly in a bulk or block shape, and the curing agent is difficult to uniformly mix after being added.
(3) The water-based drilling cutting condensate processed by the existing curing agent has lower water content after being processed for several days, but internal water migration evaporation pore passages are lacked due to the lower water content, and a great amount of water content exceeds the standard in the internal part, so that the integral water content can not meet the brick making requirement, and the agglomerated and blocky condensate is good in viscosity and not easy to break, thereby influencing the screening process efficiency in brick making;
(4) the condensate treated by the existing curing agent has low self heat value and energy consumption in brick sintering.
Disclosure of Invention
The invention aims to provide a curing agent for making bricks after curing water-based drilling cuttings as well as a preparation method and application thereof. The scheme of the invention is as follows:
a curing agent for making bricks after curing water-based drilling cuttings comprises the following materials in percentage by mass:
the sum of the mass contents of the components is 100 percent, wherein the solid surfactant is sulfonateThe anion-like surfactant is one of sodium dodecyl benzene sulfonate, sodium dodecyl naphthalene sulfonate and sodium dodecyl sulfonate; the industrial waste residue is one of coal gangue, coal cinder and stone coal; the cement is selected without adding CaCO in clinker3Such as dual-speed cement.
The following is further optimization or/and improvement of the technical scheme of the invention:
preferably, the plant hull is one or a mixture of sawdust, peanut hull powder, coconut hull powder, straw powder and reed powder.
Preferably, the inorganic salt is one of sodium chloride, potassium chloride, magnesium chloride, aluminum chloride, and ferric chloride.
Preferably, the grain size of the industrial waste residue is less than or equal to 3 mm.
Preferably, the grain diameter of the plant husk is less than or equal to 3 mm.
When the curing agent is used, the addition amount of the curing agent is 3-10% of the mass of the water-based drilling cuttings.
The preparation method of the curing agent comprises the following steps:
the first step is as follows: crushing and drying the industrial waste residue to obtain a product G1;
the second step is that: screening the plant hulls, further crushing and screening the screened powder, and drying the screened powder to obtain a product G2;
the third step: mixing inorganic salt and cement, uniformly stirring to obtain a product G3, mixing G1 and G2, and uniformly stirring to obtain products G3 and G4;
the fourth step: adding a solid surfactant into G4, and uniformly mixing to obtain a product G5;
the fifth step: mixing G3 with G5, sealing and packaging to obtain the curing agent for making bricks after mechanical dehydration and curing of the water-based drill cuttings.
Furthermore, the water content of the products G1 and G2 after drying in the first step and the second step is required to be controlled to be less than 5 percent.
Compared with the prior art, the invention has the following beneficial effects:
(1) the waste is treated by waste, the industrial waste with low combustion value such as coal gangue, coal cinder and stone coal is used as one of main addition materials of the curing agent, the heat requirement in the firing process of the baked brick can be saved, the hydrophobic property of the curing agent can reduce the adhesion of water-based drilling cuttings, the cement curing effect can be improved, and the industrial waste such as coal gangue and the like can be recycled.
(2) The cement adopted by the curing agent is cement without directly adding calcium carbonate, so that the introduction amount of calcium oxide into the water-based drilling cuttings from the curing agent is reduced, the calcium oxide content in the cured water-based drilling cuttings is favorably reduced, and the cracking rate of the water-based drilling cuttings in brick making is reduced.
(3) The plant shell has smaller density and larger surface area, on one hand, the plant shell can generate shielding effect after being adhered to the surface of the water-based drilling cuttings, reduce the absorbed water in the water-based drilling cuttings, increase the impermeability of a cured substance, change the hydrophilic property of the surface of soil particles by using a surfactant, enable the soil particles to have hydrophobicity, form effective water resistance, and obtain better compressive strength on the basis of brick making and compacting of the cured substance. On the other hand, a porous structure of the water-based drilling cutting condensate is added on the drilling site, and the water evaporation rate is accelerated, so that the water content of the water-based drilling cutting is accelerated and reduced, and the heat requirement in the sintering process of the baked brick is also saved.
(4) The inorganic salt contains a large amount of cationic electrolyte, can neutralize the negative charge on the surface of the water-based drilling cuttings, reduce zeta potential, strip the water-based drilling cuttings to adsorb water and part of crystal water to form free water, and can also accelerate cement solidification and accelerate drying of the cured water-based drilling cuttings.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying examples, in which some, but not all embodiments of the invention are shown.
The percentages in the present examples are all percentages by mass, unless otherwise specified.
The invention is further described below with reference to the following examples:
example 1: the curing agent for making bricks after curing the water-based drill cuttings consists of 5 percent of sodium dodecyl sulfate, 45 percent of coal gangue, 7 percent of sawdust, 40 percent of rapid cement and 3 percent of sodium chloride, wherein the coal gangue is firstly crushed to be within 3mm and dried, and the water content is controlled to be less than 5 percent to obtain a product G1; sieving the saw dust, further crushing the powder with the particle size larger than 3mm, mixing the powder with the sieved powder, and drying to control the water content to be less than 5% to obtain a product G2; respectively mixing sodium chloride with quick-setting cement, G1 and G2, and uniformly mixing to obtain products G3 and G4; adding sodium dodecyl sulfate into G4, and uniformly mixing to obtain a product G5; and mixing G3 with G5 to obtain the target product.
Example 2: the curing agent for making bricks after curing the water-based drill cuttings consists of 2% of sodium dodecyl sulfate, 40% of coal gangue, 5% of sawdust, 50% of rapid cement and 3% of sodium chloride, wherein the coal gangue is firstly crushed to be within 3mm, and is dried, and the water content is controlled to be less than 5%, so that a product G1 is obtained; sieving the saw dust, further crushing the powder with the particle size larger than 3mm, mixing the powder with the sieved powder, and drying to control the water content to be less than 5% to obtain a product G2; respectively mixing sodium chloride with quick-setting cement, G1 and G2, and uniformly mixing to obtain products G3 and G4; adding sodium dodecyl sulfate into G4, and uniformly mixing to obtain a product G5; and mixing G3 with G5 to obtain the target product.
Example 3: the curing agent for making bricks after curing the water-based drill cuttings consists of 5 percent of sodium dodecyl sulfate, 40 percent of coal gangue, 10 percent of sawdust, 40 percent of rapid cement and 5 percent of aluminum chloride, wherein the coal gangue is firstly crushed to be within 3mm and dried, and the water content is controlled to be less than 5 percent to obtain a product G1; sieving the saw dust, further crushing the powder with the particle size larger than 3mm, mixing the powder with the sieved powder, and drying to control the water content to be less than 5% to obtain a product G2; respectively mixing aluminum chloride with quick-setting cement and G1 with G2, and uniformly mixing to obtain products G3 and G4; adding sodium dodecyl sulfate into G4, and uniformly mixing to obtain a product G5; and mixing G3 with G5 to obtain the target product.
Example 4: the curing agent for making bricks after curing the water-based drill cuttings consists of 5 percent of sodium dodecyl sulfate, 30 percent of coal gangue, 10 percent of sawdust, 50 percent of quick-setting cement and 5 percent of sodium chloride, wherein the coal gangue is firstly crushed to be within 3mm and dried, and the water content is controlled to be less than 5 percent to obtain a product G1; sieving the saw dust, further crushing the powder with the particle size larger than 3mm, mixing the powder with the sieved powder, and drying to control the water content to be less than 5% to obtain a product G2; respectively mixing sodium chloride with quick-setting cement, G1 and G2, and uniformly mixing to obtain products G3 and G4; adding sodium dodecyl sulfate into G4, and uniformly mixing to obtain a product G5; and mixing G3 with G5 to obtain the target product.
Example 5: the curing agent for making bricks after curing the water-based drill cuttings consists of 5 percent of sodium dodecyl sulfate, 50 percent of coal gangue, 10 percent of sawdust, 30 percent of rapid cement and 5 percent of sodium chloride, wherein the coal gangue is firstly crushed to be within 3mm and dried, and the water content is controlled to be less than 5 percent to obtain a product G1; sieving the saw dust, further crushing the powder with the particle size larger than 3mm, mixing the powder with the sieved powder, and drying to control the water content to be less than 5% to obtain a product G2; respectively mixing sodium chloride with quick-setting cement, G1 and G2, and uniformly mixing to obtain products G3 and G4; adding sodium dodecyl sulfate into G4, and uniformly mixing to obtain a product G5; and mixing G3 with G5 to obtain the target product.
Example 6: the curing agent for making bricks after curing the water-based drilling cuttings consists of 5 percent of sodium dodecyl benzene sulfonate, 45 percent of cinder, 7 percent of coconut shell powder, 40 percent of double-speed cement and 3 percent of ferric chloride, wherein the cinder is firstly crushed to be within 3mm and dried, and the water content is controlled to be less than 5 percent to obtain a product G1; then screening the coconut shell powder, further crushing the powder larger than 3mm, mixing the powder with the screened powder, and drying to control the water content to be less than 5% to obtain a product G2; respectively mixing ferric chloride with quick-setting cement, G1 and G2, and uniformly mixing to obtain products G3 and G4; adding sodium dodecyl benzene sulfonate into G4, and uniformly mixing to obtain a product G5; and mixing G3 with G5 to obtain the target product.
The test method comprises the following steps:
(1) water content of drill cuttings condensate: measured according to CJ/T221-2005 sludge inspection method of municipal wastewater treatment plants;
(2) the screen residue rate: 100.0g of the condensate to be detected is screened by a 10mm screen, and the screen residue accounts for 100.0g of the mass percent of the condensate to be detected.
Taking three samples of water-based drilling cuttings 1#, 2#, and 3# of a platform for drilling shale gas horizontal wells in different periods, respectively adding more than 10% of the curing agent of the embodiment and the commercial curing agent JX-GH1, standing at 20 ℃ for 72h, wherein the change of main parameters before and after curing is shown in Table 1, and the screen residue rate of the cured water-based drilling cuttings is shown in Table 2:
table 1: water content Change Table of Water-based drill cuttings before and after addition of 10% curing agent (Unit:%)
As can be seen from Table 1, the water content of the water-based drill cuttings is reduced from 71.09-83.53% to 48.22-59.17% by adding 10% of the curing agent of the examples, the water content of the cured materials is lower than 60%, and the water content of the commercial curing agent is reduced to 64.92-71.38% and is higher than 60%.
Table 2: comparative Table for Sieve residue ratio after addition of 10% curing agent (Unit:%)
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Commercially available curing agent | |
| 1# | 51.6 | 55.2 | 48.3 | 45.6 | 51.4 | 48.7 | 85.5 |
| 2# | 43.3 | 44.8 | 41.2 | 39.8 | 43.0 | 41.6 | 74.2 |
| 3# | 30.4 | 32.3 | 28.5 | 25.5 | 30.2 | 28.9 | 62.8 |
The higher the water content of the cured water-based drill cuttings is, the more easily the cured water-based drill cuttings are agglomerated and blocky, the larger the screen residue rate is, the drill cuttings without the curing agent are agglomerated and blocky, and the screen residue rate is more than 90 percent, as can be seen from table 2, 10 percent of the curing agent of the embodiment is added into the water-based drill cuttings, the screen residue rate is 25.5 to 55.2 percent, and 10 percent of the commercial curing agent is added, the screen residue rate is 62.8 to 85.5 percent, and the comparison shows that the screen residue rate is reduced by 35.44 to 54.39 percent after the curing agent is added into the water-based drill cuttings with the same water content.
Example 7: a certain sintered brick factory in Sichuan receives water-based drilling cuttings added with 3 percent of the curing agent and water-based drilling cuttings added with 3 percent of other existing curing agents respectively, after the average water content is detected to be less than 50 percent, the drilling cuttings are mixed with bricks according to 20 percent, the cracking amount of the finished bricks after sintering accounts for 6.3 percent and 52.6 percent respectively, and meanwhile, compared with the prior art, the consumption of fire coal in the sintering process is saved by 22.8 percent after the curing agent is added.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. Further modifications are possible without departing from the principles of the invention and these modifications are to be considered as protection of the invention.
Claims (8)
1. A curing agent for making bricks after curing water-based drilling cuttings comprises the following materials in percentage by mass:
the sum of the mass contents of the components is 100%, wherein the solid surfactant is one of sodium dodecyl benzene sulfonate, sodium dodecyl naphthalene sulfonate and sodium dodecyl sulfonate; the industrial waste residue is one of coal gangue, coal cinder and stone coal; the cement is selected without adding CaCO in clinker3The cement of (1).
2. The curing agent for making bricks after curing water-based drill cuttings according to claim 1, wherein the plant hull is one or a mixture of sawdust, peanut shell powder, coconut shell powder, straw powder and reed powder.
3. The curing agent for making bricks after curing water-based drill cuttings according to claim 1, wherein the inorganic salt is one of sodium chloride, potassium chloride, magnesium chloride, aluminum chloride and ferric chloride.
4. The curing agent for making bricks after curing water-based drill cuttings according to claim 1, wherein the industrial residue has a particle size of less than or equal to 3 mm.
5. The curing agent for making bricks after curing water-based drill cuttings according to claim 1, wherein the grain size of the plant hull is less than or equal to 3 mm.
6. A method of preparing the curing agent for use in post-cure brickmaking of water-based drill cuttings as claimed in any one of claims 1 to 5, comprising the steps of:
the first step is as follows: crushing and drying the industrial waste residue to obtain a product G1;
the second step is that: screening plant hulls, further crushing the sieved powder, and drying the screened powder to obtain a product G2;
the third step: respectively mixing inorganic salt with cement, G1 with G2, and uniformly mixing to obtain products G3 and G4;
the fourth step: adding a solid surfactant into G4, and uniformly mixing to obtain a product G5;
the fifth step: mixing G3 with G5 to obtain the curing agent for brickmaking water-based drilling cuttings after mechanical dehydration and curing.
7. The method of claim 6, wherein the products G1 and G2 have a moisture content of less than 5%.
8. Use of the curing agent for use in post-curing brickmaking of water-based drill cuttings according to any one of claims 1 to 5, wherein the curing agent is added in an amount of 3 to 10% by weight of the water-based drill cuttings.
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