阅读说明：本技术 一种用于水基钻屑固化后制砖的固化剂及其制备方法与应用 (Curing agent for making bricks after curing water-based drilling cuttings as well as preparation method and application of curing agent ) 是由 任家川 黄世东 于 2020-04-26 设计创作，主要内容包括：本发明提供了一种用于水基钻屑固化后制砖的固化剂及其制备方法与应用,涉及油田水基钻屑环保治理技术领域,本固化剂由2％～5％固体表面活性剂、30％～50％工业废渣、30％～50％水泥、5％～10％植物壳皮、3％～5％无机盐组成。本固化剂使用煤矸石等工业废渣,“以废治废”,引入了植物壳皮和固体表面活性剂,解决了水基钻屑固化后用于制备烧结砖易酥裂、水分高及黏结等问题,有利于水基钻屑固化物资源化用于制备烧结砖,具有实用价值和推广前景。(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.)

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.

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: