CN115975609B - Preparation method and application of high-density solid-free weighting agent - Google Patents
Preparation method and application of high-density solid-free weighting agent Download PDFInfo
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- CN115975609B CN115975609B CN202111205514.7A CN202111205514A CN115975609B CN 115975609 B CN115975609 B CN 115975609B CN 202111205514 A CN202111205514 A CN 202111205514A CN 115975609 B CN115975609 B CN 115975609B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 80
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 238000005553 drilling Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 26
- 239000002318 adhesion promoter Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000002738 chelating agent Substances 0.000 claims abstract description 8
- 239000007790 solid phase Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 5
- 239000002904 solvent Substances 0.000 claims abstract description 4
- 239000007791 liquid phase Substances 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 239000007787 solid Substances 0.000 claims description 22
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 21
- 239000012530 fluid Substances 0.000 claims description 21
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims description 16
- WFIZEGIEIOHZCP-UHFFFAOYSA-M potassium formate Chemical compound [K+].[O-]C=O WFIZEGIEIOHZCP-UHFFFAOYSA-M 0.000 claims description 15
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 12
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 10
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 10
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 10
- RYCLIXPGLDDLTM-UHFFFAOYSA-J tetrapotassium;phosphonato phosphate Chemical compound [K+].[K+].[K+].[K+].[O-]P([O-])(=O)OP([O-])([O-])=O RYCLIXPGLDDLTM-UHFFFAOYSA-J 0.000 claims description 10
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 9
- 239000004280 Sodium formate Substances 0.000 claims description 8
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 8
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 8
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 8
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 claims description 8
- 235000019254 sodium formate Nutrition 0.000 claims description 8
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 8
- 229920002678 cellulose Polymers 0.000 claims description 6
- 239000001913 cellulose Substances 0.000 claims description 6
- 229910000160 potassium phosphate Inorganic materials 0.000 claims description 6
- 235000011009 potassium phosphates Nutrition 0.000 claims description 6
- 235000010265 sodium sulphite Nutrition 0.000 claims description 6
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 5
- 239000011591 potassium Substances 0.000 claims description 5
- 229910052700 potassium Inorganic materials 0.000 claims description 5
- 239000000176 sodium gluconate Substances 0.000 claims description 5
- 235000012207 sodium gluconate Nutrition 0.000 claims description 5
- 229940005574 sodium gluconate Drugs 0.000 claims description 5
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 5
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 5
- 239000000230 xanthan gum Substances 0.000 claims description 5
- 229920001285 xanthan gum Polymers 0.000 claims description 5
- 235000010493 xanthan gum Nutrition 0.000 claims description 5
- 229940082509 xanthan gum Drugs 0.000 claims description 5
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 4
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 claims description 4
- HELHAJAZNSDZJO-OLXYHTOASA-L sodium L-tartrate Chemical compound [Na+].[Na+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O HELHAJAZNSDZJO-OLXYHTOASA-L 0.000 claims description 4
- 239000001433 sodium tartrate Substances 0.000 claims description 4
- 229960002167 sodium tartrate Drugs 0.000 claims description 4
- 235000011004 sodium tartrates Nutrition 0.000 claims description 4
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 4
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 3
- 239000001509 sodium citrate Substances 0.000 claims description 3
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000003002 pH adjusting agent Substances 0.000 claims description 2
- 229960001790 sodium citrate Drugs 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 19
- 238000011282 treatment Methods 0.000 abstract description 8
- 239000000243 solution Substances 0.000 description 77
- 238000003756 stirring Methods 0.000 description 22
- 238000010992 reflux Methods 0.000 description 19
- 150000003839 salts Chemical class 0.000 description 18
- 239000007864 aqueous solution Substances 0.000 description 14
- 239000012153 distilled water Substances 0.000 description 14
- 238000004090 dissolution Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 8
- 239000011521 glass Substances 0.000 description 8
- 229910019142 PO4 Inorganic materials 0.000 description 7
- 239000010452 phosphate Substances 0.000 description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 6
- 229910001410 inorganic ion Inorganic materials 0.000 description 6
- 239000012266 salt solution Substances 0.000 description 6
- ATZQZZAXOPPAAQ-UHFFFAOYSA-M caesium formate Chemical compound [Cs+].[O-]C=O ATZQZZAXOPPAAQ-UHFFFAOYSA-M 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 5
- 235000019796 monopotassium phosphate Nutrition 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229960003975 potassium Drugs 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229920006321 anionic cellulose Polymers 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 229910017053 inorganic salt Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229920002401 polyacrylamide Polymers 0.000 description 3
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- -1 sulfate radical Chemical class 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000008398 formation water Substances 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000403 monosodium phosphate Inorganic materials 0.000 description 2
- 235000019799 monosodium phosphate Nutrition 0.000 description 2
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 2
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 2
- VBZOUUJVGADJBK-UHFFFAOYSA-N 2-bromopropanedioic acid Chemical compound OC(=O)C(Br)C(O)=O VBZOUUJVGADJBK-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 244000207740 Lemna minor Species 0.000 description 1
- 235000006439 Lemna minor Nutrition 0.000 description 1
- 235000001855 Portulaca oleracea Nutrition 0.000 description 1
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 1
- 239000004111 Potassium silicate Substances 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical group [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 235000019797 dipotassium phosphate Nutrition 0.000 description 1
- 229910000396 dipotassium phosphate Inorganic materials 0.000 description 1
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000011056 potassium acetate Nutrition 0.000 description 1
- 239000001508 potassium citrate Substances 0.000 description 1
- 229960002635 potassium citrate Drugs 0.000 description 1
- QEEAPRPFLLJWCF-UHFFFAOYSA-K potassium citrate (anhydrous) Chemical compound [K+].[K+].[K+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O QEEAPRPFLLJWCF-UHFFFAOYSA-K 0.000 description 1
- 235000011082 potassium citrates Nutrition 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention provides a preparation method and application of a high-density solid-free weighting agent, wherein the preparation method comprises the following steps of S1, dissolving a first soluble weighting material and a second soluble weighting material in a solvent, preferably water, to obtain a solution A; s2, adding a pH regulator into the solution A to obtain a solution B with the pH value of 8-9.5; s3, performing first heat treatment on the solution B to obtain a solution C; s4, cooling the solution C, and adding an adhesion promoter, an deoxidizer and a chelating agent into the cooled solution C to obtain a solution D; s5, performing second heat treatment on the solution D to obtain a solution E; s6, heating the solution E to remove a liquid phase to obtain a solid phase; s7, drying and granulating the solid phase in sequence to obtain the high-density solid-free weighting agent. The density of the obtained weighting agent can reach 1.715g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The temperature resistance reaches 180 ℃, the shielding effect is low, and the stretching influence on the polymer molecular chain is small; has the performances of high density, no solid phase, high temperature resistance, low shielding effect, low cost and the like, is suitable for deep well drilling requirements.
Description
Technical Field
The invention relates to the field of drilling fluid of oil and gas fields, in particular to a preparation method and application of a high-density solid-free weighting agent.
Background
With the progress of oil field exploration and development work, the layer of a drilling oil reservoir is deepened continuously, the temperature and the pressure of the reservoir are increased correspondingly, the requirement on drilling fluid in the oil and gas well exploitation process is also higher and higher, and the density of the current common solid-free drilling fluid is generally lower than 1.50g/cm 3 The temperature resistance is not more than 150 ℃, the requirements of high-temperature and high-pressure gas reservoir exploration and development are difficult to meet, and development of a high-temperature and high-density solid-free drilling fluid without a solid weighting agent is needed.
In the field of oil and gas field drilling, the solid-free weighting agent is generally two kinds of inorganic salt and organic salt. Wherein the inorganic salt weighting agent is mainly chloride, and NaCl, KCl, caCl is common 2 、MgCl 2 And ZnCl 2 The organic salt is mainly formate, and sodium formate, potassium formate, cesium formate and the like are common. The inorganic salt weighting agent has high requirements on other treatment agents in drilling fluid, has high rheological control difficulty in the construction process, has strong corrosiveness on underground pipes and has poor environmental protection. Wherein monovalent inorganic salts are generally used to formulate compositions having densities below 1.30g/cm 3 When the density is higher than 1.30g/cm 3 In the process, divalent salt or organic salt weighting agents are usually adopted, but divalent salts such as calcium salt and zinc salt are easy to react with formation water to form scale to generate sediment, so that the reservoir pores are seriously blocked, and the method is high in price, serious in corrosion, toxic to environment and people and not suitable for wide use. Sodium formate is easy to agglomerate and crystallize at the temperature lower than 11 ℃. The saturated solubility of potassium formate is 1.58g/cm 3 However, the amount of the water is 3 times that of water, and the amount is large, so that the cost is high. Cesium formate can be formulated to have a density of 2.4g/cm 3 The left and right drilling fluids, but the raw materials are up to more than 40 ten thousand per ton, and the popularization and the application of the drilling fluids are greatly limited.
Meanwhile, in the high-concentration solid-free weighting agent, the K is used for + 、Na + 、Ca 2+ The inorganic ions have high content and extremely strong electrostatic shielding effect, and when the polymer treating agent is dissolved by using a high-salt concentration solution, the inorganic ions are easy to combine with side groups on polymer molecules, so that the charge repulsive force in the molecules is shielded, the extension degree of polymer molecular chains is reduced, the mobility of the polymer molecules is weakened, and the macroscopic viscosity of the polymer solution is correspondingly reduced, so that the viscosity of the prepared drilling fluid is lower. In order to meet the drilling needs, technicians often increase the addition of the tackifier, but after high-temperature aging or downhole circulation, the electrostatic shielding effect is weakened, polymer molecular chains are stretched, and the viscosity of the drilling fluid is excessively large, so that the performance is deteriorated.
Therefore, there is a need to develop a solid-free weighting agent with low impact on polymer treatment agents, which is resistant to high temperature, high density, low cost and low shielding effect, so as to ensure the safety and high efficiency of the oil and gas reservoir and the increased storage and production of the later-period reservoir.
Chinese patent CN104610937 a discloses an environment-friendly high-density solid-free weighting agent and a preparation method thereof. The highest density of the weighting agent can reach 1.828g/cm 3 The mixture ratio is as follows: 0.02-0.05 part of dispersing agent, 0.3-1 part of adhesion promoter, 0.5-1.2 parts of chelating agent, 0.6-2 parts of corrosion inhibitor and the balance of soluble weighting material, wherein the soluble weighting material is one or more of potassium formate, potassium citrate, potassium acetate, potassium silicate and potassium sulfate. The process comprises the following steps: mixing the raw materials according to the weight ratio, and uniformly stirring; adding into waterHigh temperature (70-80 ℃) dissolution; evaporating to dryness to obtain a solid; the obtained solid was pulverized into powder to obtain a solid weighting agent.
Chinese patent CN107987806 a discloses a monovalent salt weighting agent, its preparation method and application. The weighting agent is used for preparing well-killing liquid with density of 1.40-1.65g/cm 3 The range of the temperature resistance is adjustable, the temperature resistance reaches 180 ℃, and the temperature resistance comprises the following components in parts by weight: 28-48 parts of monovalent organic salt, 4-6 parts of industrial salt, 20-33 parts of sodium dihydrogen phosphate, 19-32 parts of disodium hydrogen phosphate and 3-5 parts of potassium phosphate, wherein the organic salt is at least one of sodium formate, potassium formate and sodium acetate. The preparation method comprises the following steps: according to the weight portions of the components, monovalent organic salt, industrial salt, sodium dihydrogen phosphate, disodium hydrogen phosphate, potassium phosphate and an optional corrosion inhibitor are mixed and stirred uniformly to obtain the monovalent salt weighting agent.
Chinese patent CN107642357 a discloses a temperature-resistant low-corrosion high-density solid-free test solution and a preparation method thereof. The highest liquid density of the test liquid can reach 1.82g/cm 3 And can maintain stable performance at 180 ℃, and mainly comprises 0.02-0.05wt% of deoxidizer and 10-70wt% of phosphate. The preparation method comprises the following steps: and dissolving the raw materials with water, uniformly mixing to obtain a mixed solution, and cooling the mixed solution to room temperature.
Chinese patent CN 107033863A discloses a solid-free pollution-free low-damage high-density completion fluid and a preparation method thereof. The density of the completion fluid is 1.7-1.9 g/cm 3 The temperature resistance is adjustable to 160 ℃, and the temperature resistance comprises 1-5% of potassium hydroxide, 5-10% of monopotassium phosphate, 15-40% of monopotassium phosphate, 1-5% of potassium formate, 10-30% of potassium pyrophosphate, 5-12% of cesium formate, 0.2-0.8% of adhesion promoter, 1-2% of filtrate reducer and the balance of water by mass fraction. The preparation method comprises the following steps: adding potassium dihydrogen phosphate, potassium formate, potassium pyrophosphate and cesium formate into reclaimed water, and stirring until the potassium dihydrogen phosphate, potassium formate, potassium pyrophosphate and cesium formate are completely dissolved to prepare a base solution; adding the adhesion promoter into the base solution, stirring, uniformly mixing, adding the filtrate reducer, stirring, and uniformly mixing; finally, adding potassium hydroxide to make the pH value of the solution between 10 and 12, and continuously stirring until the solution is uniformly mixed.
Chinese patent CN107603578A discloses a weighting salt for high-density low-pH completion fluid and a preparation method thereof. The density of the saturated aqueous solution of the weighting agent at 20 ℃ is 1.32-1.726 g/cm 3 The method comprises the following steps: (1) Adding the component A into distilled water, stirring and dissolving, and regulating the pH value of the solution to 4-7; (2) Heating the solution to 93-125 ℃, and carrying out reflux heat preservation for 10-120 min; (3) adding the component B, and adjusting the pH value of the solution to 7.5-8.5; (4) Heating the solution to 105-125 ℃, and carrying out reflux heat preservation for 10-120 min; (5) Heating and concentrating the solution obtained in the step (4) at the temperature of less than or equal to 105 ℃, and drying and granulating; wherein the component A is selected from one or more of bromomalonic acid, phosphoric acid, monopotassium phosphate, dipotassium phosphate and potassium phosphate; the component B is one or more selected from potassium pyrophosphate, potassium tripolyphosphate and potassium formate.
The invention provides a high-density solid-free weighting agent and a preparation method thereof, which simultaneously have the performances of high density, high temperature resistance, low shielding effect, low cost and the like, and are suitable for deep well drilling.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a method for preparing a high-density solid-free weighting agent, so as to solve the problem that the density of the current common solid-free drilling fluid is generally lower than 1.50g/cm 3 And the problems of difficult adhesion and cutting control, high cost and the like are solved. The density of the weighting agent prepared by the preparation method can reach 1.715g/cm at maximum 3 The method comprises the steps of carrying out a first treatment on the surface of the The temperature resistance reaches 180 ℃, the shielding effect is low, and the stretching influence on the polymer molecular chain is small; has the performances of high density, no solid phase, high temperature resistance, low shielding effect, low cost and the like, is suitable for deep well drilling requirements.
It is another object of the present invention to provide a high-density solid-free weighting agent corresponding to one of the objects.
It is a further object of the present invention to provide a high density solid free weighting agent solution corresponding to the above object.
The fourth object of the present invention is to provide a density solid-free weighting agent and the use of a high density solid-free weighting agent solution corresponding to the above object.
In order to achieve one of the above purposes, the technical scheme adopted by the invention is as follows:
a preparation method of a high-density solid-free weighting agent comprises the following steps:
s1, dissolving a first soluble weighting material and a second soluble weighting material in a solvent to obtain a solution A;
s2, adding a pH regulator into the solution A to obtain a solution B with the pH value of 8-9.5;
s3, performing first heat treatment on the solution B to obtain a solution C;
s4, cooling the solution C, and adding an adhesion promoter, an deoxidizer and a chelating agent into the cooled solution C to obtain a solution D;
s5, performing second heat treatment on the solution D to obtain a solution E;
s6, heating the solution E to remove a liquid phase to obtain a solid phase; and
s7, drying and granulating the solid phase in turn to obtain the high-density solid-free weighting agent,
wherein in step S1, the first soluble weighting material is selected from at least one of phosphate, preferably potassium phosphate, dipotassium hydrogen phosphate, potassium tripolyphosphate and potassium pyrophosphate, and the second soluble weighting material is selected from formate, preferably at least one of sodium formate and potassium formate.
In some preferred embodiments of the present invention, in step S1, the solvent is water.
According to the present invention, the water may be distilled water or deionized water.
In some preferred embodiments of the invention, the components are used in amounts of parts by weight:
in some preferred embodiments of the present invention, the total amount of the first soluble weighting material and the second soluble weighting material is 55 to 200 parts, preferably 100 to 200 parts, more preferably 120 to 180 parts.
In some preferred embodiments of the present invention, the first soluble weighting material is used in an amount of 25 to 30 parts, and the second soluble weighting material is used in an amount of 100 to 130 parts.
According to the invention, the pH regulator is used in such an amount that the pH of the solution reaches a predetermined value.
In some preferred embodiments of the present invention, the pH adjuster is selected from at least one of sodium hydroxide and potassium hydroxide; and/or the tackifier is selected from at least one of low-viscosity carboxymethyl cellulose (LV-CMC), high-viscosity carboxymethyl cellulose (HV-CMC), low-polyanionic cellulose (LV-PAC), high-polyanionic cellulose (HV-PAC), xanthan gum (XC), hydroxyethyl cellulose (HEC) and sulfonate copolymer (DSP); and/or the deoxidizer is at least one of thiourea, sodium thiosulfate and sodium sulfite; and/or the chelating agent is selected from at least one of sodium gluconate, disodium edetate, sodium tartrate and sodium citrate.
According to the present invention, the low viscosity carboxymethyl cellulose (LV-CMC) may be any commercially available product, for example, having a viscosity in the range of 0.2 to 0.5 Pa.s in a 2% aqueous solution.
According to the present invention, the high viscosity carboxymethyl cellulose (HV-CMC) may be any commercially available product, for example, having a viscosity in the range of 0.8 to 1.0pa·s in a 2% aqueous solution.
According to the invention, the oligomeric anionic cellulose (LV-PAC) may be any commercially available product of any brand, with an exemplary viscosity in the range of 80 to 100mPa.s in a 2% aqueous solution.
According to the invention, the high-anionic cellulose (HV-PAC) may be any commercially available product, for example, with a viscosity in the range of 2% aqueous solution at > 160 mPa.s.
According to the present invention, the further specific kind of the above-mentioned adhesion promoter is not particularly limited, and any of the above-mentioned kinds of materials known in the market can be applied to the present application and achieve the same technical effect.
In some preferred embodiments of the present invention, in step S3, the conditions of the first heat treatment include: the temperature is 70-110 ℃, and the time is 1-6 hours, preferably 2-4 hours.
According to the invention, the first heat treatment is carried out under reflux conditions.
According to the invention, the beneficial effects obtained by treating the solution B in the manner defined by the first heat treatment at least comprise: firstly, the phosphate is slowly hydrolyzed in the alkali solution, and the temperature is raised, so that the dissolution of the phosphate and formate is accelerated. Secondly, after the phosphate and formate are completely dissolved, the aqueous solution has viscosity, and after the aqueous solution rolls at high temperature, the aqueous solution has stable dispersibility, and experimental results are obtained, especially when the aqueous solution is in a state close to a saturated solution, other treating agents are continuously added, so that crystals are not easy to precipitate.
In some preferred embodiments of the present invention, in step S4, the target temperature of the cooling is 20 ℃ to 40 ℃.
In some preferred embodiments of the present invention, in step S5, the conditions of the second heat treatment include: the temperature is 70-100 ℃, and the time is 1-8 hours, preferably 2-6 hours.
According to the invention, the beneficial effects obtained by treating the solution D in the manner defined by the second heat treatment at least comprise: first, at high temperature, the molecules are in intense movement, the acting force among the molecules of the adhesion promoter is larger than the shielding effect of salt, the molecular chains are stretched, and the adhesion promoter shows better viscosity. When the molecular chain of the adhesion promoter stretches, the acting force among molecules is strong, and the inorganic ion shielding effect is greatly reduced by cooperating with the chelating agent, so that the control of the adding amount of other treating agents such as adhesion promoters, flow pattern regulators and the like in the subsequent drilling fluid is facilitated. Secondly, the method is favorable for deoxidizing, improves the temperature resistance and stability of the treating agent, and ensures that the formed solid-free weighting agent is more stable.
In some preferred embodiments of the present invention, in step S6, the heating conditions include a temperature of 90 ℃ to 100 ℃.
According to the invention, in step S6, the heating is aimed at concentrating the solution E.
In some preferred embodiments of the present invention, in step S7, the drying conditions include: the temperature is 100-150 ℃ and the time is 2-12 h.
According to the invention, in step S7, the granulation is a conventional manner of operation in the art, which is not intended to be too restrictive, and may be carried out according to any granulation process commonly used in the art, even known.
In order to achieve the second purpose, the technical scheme adopted by the invention is as follows:
a high density solid free weighting agent made according to the method of any one of the above embodiments.
In order to achieve the third purpose, the technical scheme adopted by the invention is as follows:
a high density solid free weighting agent solution comprising the high density solid free weighting agent of any of the above embodiments and water.
In some preferred embodiments of the present invention, the high density solid free weighting agent solution has a density of 1.317g/cm at 30℃ 3 ～1.715g/cm 3 Preferably 1.534g/cm 3 ～1.715g/cm 3 。
In some preferred embodiments of the present invention, the high density solid free weighting agent solution has a pH of 8.0 to 9.0.
In order to achieve the fourth purpose, the technical scheme adopted by the invention is as follows:
use of the high density solid free weighting agent of any of the above embodiments or the high density solid free weighting agent solution of any of the above embodiments in a drilling fluid.
In some preferred embodiments of the invention, the application is as a drilling fluid additive.
According to the present invention, the drilling fluid may be any drilling fluid known in the art.
The beneficial effects of the invention are at least the following aspects:
firstly, the solid-free weighting agent prepared according to the scheme of the invention is prepared into a weighting agent aqueous solution with water, and the density of the unsaturated aqueous solution is 1.317-1.715g/cm 3 The highest density of the solution reaches 1.715g/cm 3 Is greatly higher than the density (1.57 g/cm) of the prior common solid-free weighting agent 3 )。
Secondly, the introduced phosphate has the function of a corrosion inhibitor, so that the corrosion strength to the downhole tool can be reduced, and the downhole drilling tool can be effectively protected.
And thirdly, the adhesion promoter and the chelating agent are adopted, so that the shielding effect of inorganic ions is reduced, and the control of the adding amount of the subsequent treatment agent is facilitated.
Fourthly, monovalent salt is adopted for compounding, so that carbonate, sulfate radical and the like of formation water are not easy to generate precipitates, a reservoir is not blocked, and the pollution to the reservoir is small.
Fifth, compared with the prior art, the cost of the high-density weighting agent is greatly reduced due to the adoption of the phosphate weighting material and low price.
Detailed Description
The present invention will be described in detail with reference to examples, but the scope of the present invention is not limited to the following description.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products available commercially without the manufacturer's knowledge.
In the following embodiments, xanthan gum (XC) was used as purchased from the chemical industry limited of dune, inc. In the northland; high viscosity carboxymethylcellulose (HV-CMC) was purchased from viterbi drilling aids limited in the field of duckweed; high polyanionic cellulose (HV-PAC) was purchased from hebei westerner chemical limited; low viscosity carboxymethylcellulose (LV-CMC) was purchased from Viterbi drilling aid Co., ltd; oligo anionic cellulose (LV-PAC) was purchased from the Shandong Dongying large cellulose plant; hydroxyethyl cellulose (HEC) was purchased from Zigbo sea wave chemical Co., ltd; sulfonate copolymers (DSP) were purchased from the eastern cistron oil technology company.
Example 1
Adding 100g of distilled water into a glass reaction bottle, then adding 25g of sodium formate and 30g of potassium tripolyphosphate, stirring for dissolution, and adjusting the pH value to 8 by using potassium hydroxide; heating the solution to 70 ℃ and refluxing and preserving heat for 1h; the solution was cooled to 20℃and dissolved by stirring with 0.3g XC,0.1g HV-CMC,0.02g thiourea, 0.3g disodium ethylenediamine tetraacetate; heating the solution to 70 ℃ and refluxing and preserving heat for 2 hours; the solution was concentrated by heating at 95℃and dried for 4h, and granulated.
Example 2
Adding 100g of distilled water into a glass reaction bottle, then adding 30g of sodium formate and 50g of potassium phosphate, stirring for dissolution, and adjusting the pH value to 8.5 by using sodium hydroxide; heating the solution to 80 ℃ and refluxing and preserving heat for 4 hours; the solution was cooled to 30℃and 0.2g XC,0.1g HV-PAC,0.03g sodium thiosulfate, 0.4g sodium gluconate were added and dissolved with stirring; heating the solution to 90 ℃ and refluxing and preserving heat for 1h; the solution was concentrated by heating at 100℃and dried for 4h, and granulated.
Example 3
Adding 100g of distilled water into a glass reaction bottle, then adding 60g of sodium formate and 70g of potassium pyrophosphate, stirring for dissolution, and adjusting the pH value to 8.5 by using sodium hydroxide; heating the solution to 90 ℃ and refluxing and preserving heat for 3 hours; the solution was cooled to 30℃and 0.1g XC,0.5g LV-CMC,0.05g sodium sulfite, 0.1g sodium citrate was added and dissolved with stirring; heating the solution to 80 ℃ and refluxing and preserving heat for 2 hours; the solution was concentrated by heating at 97℃and dried for 4h, and granulated.
Example 4
Adding 100g of distilled water into a glass reaction bottle, then adding 100g of potassium formate and 30g of dipotassium hydrogen phosphate, stirring for dissolution, and adjusting the pH value to 9.5 by potassium hydroxide; heating the solution to 110 ℃ and refluxing and preserving heat for 6 hours; the solution was cooled to 20℃and 0.3g HEC,0.5g LV-PAC,0.02g sodium sulfite, 0.3g sodium tartrate were added and dissolved with stirring; heating the solution to 90 ℃ and refluxing and preserving heat for 5 hours; the solution was concentrated by heating at 95℃and dried for 4h, and granulated.
Example 5
Adding 100g of distilled water into a glass reaction bottle, then adding 66.7g of potassium formate and 50g of potassium tripolyphosphate, stirring for dissolution, and adjusting the pH value to 9 by using sodium hydroxide; heating the solution to 110 ℃ and refluxing and preserving heat for 2 hours; the solution was cooled to 30℃and 0.2g HEC and 0.1g DSP,0.03g sodium thiosulfate, 0.2g sodium gluconate were added and dissolved with stirring; heating the solution to 80 ℃ and refluxing and preserving heat for 6 hours; the solution was concentrated by heating at 95℃and dried for 4h, and granulated.
Example 6
Adding 100g of distilled water into a glass reaction bottle, then adding 40g of potassium formate and 70g of potassium pyrophosphate, stirring for dissolution, and adjusting the pH value to 8.5 by using sodium hydroxide; heating the solution to 110 ℃ and refluxing and preserving heat for 4 hours; the solution was cooled to 30℃and 0.2g HEC and 0.2g DSP,0.04g sodium sulfite, 0.3g disodium edetate were added and dissolved with stirring; heating the solution to 80 ℃ and refluxing and preserving heat for 6 hours; the solution was concentrated by heating at 100℃and dried for 4h, and granulated.
Example 7
Adding 100g of distilled water into a glass reaction bottle, then adding 30g of potassium formate and 100g of potassium pyrophosphate, stirring for dissolution, and adjusting the pH value to 9 by using potassium hydroxide; heating the solution to 110 ℃ and refluxing and preserving heat for 4 hours; the solution was cooled to 40℃and 0.3g HEC and 0.2g DSP,0.05g thiourea, 0.5g sodium gluconate were added and dissolved with stirring; heating the solution to 100 ℃ and refluxing and preserving heat for 4 hours; the solution was concentrated by heating at 100℃and dried for 4h, and granulated.
Example 8
Adding 100g of distilled water into a glass reaction bottle, then adding 25g of potassium formate and 130g of potassium pyrophosphate, stirring for dissolution, and adjusting the pH value to 9 by using sodium hydroxide; heating the solution to 110 ℃ and refluxing and preserving heat for 4 hours; the solution was cooled to 40℃and 0.1g of DSP and 0.2g of gLV-CMC,0.04g of sodium sulfite, 0.4g of sodium tartrate were added and dissolved by stirring; heating the solution to 100 ℃ and carrying out reflux heat preservation for 8 hours; the solution was concentrated by heating at 100℃and dried for 4h, and granulated.
Example 9
This example differs from example 8 only in that the pH was adjusted to 8.5 with sodium hydroxide, and the weighting agent was obtained under exactly the same conditions as the rest.
Example 10
This example differs from example 8 only in that the pH was adjusted to 9.5 with sodium hydroxide, and the weighting agent was obtained under exactly the same conditions as the rest.
Comparative example 1
Weighting agents were prepared as described in CN107603578A, example 2.
Comparative example 2
Weighting agents were prepared as described in CN 107642357A, example 6.
Test example 1
The solid weighting agents prepared in the above embodiments were subjected to dissolution experiments, and dissolved in 100mL of distilled water to prepare aqueous weighting agent solutions, each of which was completely dissolved without precipitation, and the solution densities were as shown in the following table (the densities were measured at 30 ℃).
The above dissolution experiment shows that: the density of the weighting agent aqueous solution prepared by the invention can reach 1.715g/cm 3 The density is in the range of 1.317-1.715g/cm 3 . The weighting agent aqueous solutions are all unsaturated.
Test example 2
The weighting agents of examples 1-10 and comparative examples 1-2 were dissolved in 100mL of distilled water and the adhesion promoters were added to examine the effect of inorganic ion shielding effect on the polymer adhesion promoters, and the specific test results are shown in the following table.
The data in examples 1-10 above show that the system sticking increases significantly when additional polymeric treatments are added to the aqueous weighting agent solution at ambient temperature and pressure. The comparative data of examples 8-10 show that when the pH solution in the preparation method S2 is 9, the shielding effect of salt ions in the solution is minimal, and the increase of the viscosity of the solution is relatively large. The viscosity of the solution is not increased but is reduced after the adhesion promoters are continuously added in the comparative examples 1 and 2, and the fact that the adhesion promoters prepared by the conventional preparation method are prepared into high-concentration salt solution is verified, so that the molecular extension of the adhesion promoters is easily limited. Meanwhile, as is clear from the data of example 6 and example 9 in table 3 of the comparative document CN 107642357A, the density of the two examples is not very different, but the viscosity is very different, example 9 is a polymer-based adhesion promoter with 2.5% xanthan gum and 2.5% polyacrylamide added to example 6, which is a simple salt solution with a higher viscosity than example 6, and the viscosity of the solution is obviously increased at such high addition, especially for polyacrylamide, but the test data of example 6 is not so, which further verifies that the high concentration salt solution can limit the molecular extension of the adhesion promoter.
Therefore, the inorganic ion shielding effect of the weighting agent aqueous solution prepared by the invention is reduced, the influence on the stretching of polymer molecules is less, and the addition control of technicians is facilitated.
Test example 3
The weighting agents of examples 1-10 were dissolved in 100mL of distilled water, and a hot rolling test was conducted at 180℃for 16 hours, and no crystal was found to be precipitated, and the density and apparent viscosity of the weighting agent solution were measured at 30℃using a densitometer and a six-speed rotational viscometer, as can be seen from the data in the following table, and the density and apparent viscosity did not change significantly before and after hot rolling. Therefore, the high-density solid-free weighting agent prepared by the embodiment of the invention has the temperature resistance reaching 180 ℃.
Test example 4
The weighting agents of examples 1-10 and comparative examples 1-2 were dissolved in 100mL of distilled water, and the addition of the polymeric viscosity-increasing agent was continued, and a hot rolling test was performed at a temperature of 150℃for 16 hours, cooled to 30℃and the viscosity change was measured using a six-speed rotational viscometer, and the effect of the viscosity-increasing agent on the performance of the weighting agent solution was examined at high temperature and high salt concentration.
The data in examples 1-10 above show that the system viscosity change is small and no cotton-like material is formed when other polymer-based treatment agents are added continuously to the high salt solution prepared by using the weighting agent prepared by the invention at 150 ℃. The viscosity of the comparative examples 1 and 2 is increased by continuously adding the tackifier, and particularly the viscosity of the comparative example 2 is remarkably increased, so that the reasonable addition range of the polymer tackifier is greatly influenced by the person skilled in the art. This is mainly because comparative example 2 contains 2.5% xanthan gum and 2.5% polyacrylamide (300 to 600 tens of thousands) polymer type adhesion promoter, and at normal temperature and pressure, the polymer is limited in molecular extension by a large amount of salt ions, and macroscopically shows low viscosity, but under the action of high-temperature high-salt solution, the molecular thermal motion effect is greater than the shielding effect of salt, and the molecular structure of the polymer type adhesion promoter is extended, so that the viscosity is greatly increased. In the high-temperature high-salt solution, partial polymer adhesion promoters are broken to generate small molecular substances, and a large number of small molecules are bound to form cotton-like substances. Therefore, when the weighting agent is prepared by adopting a general preparation method and the polymer treatment agent is continuously added, the overall performance of the solution is greatly influenced, the adding range of the polymer tackifier is not reasonably determined by the person skilled in the art, and the performance of the whole drilling fluid is sometimes damaged.
It should be noted that the above-described embodiments are only for explaining the present invention and do not constitute any limitation of the present invention. The invention has been described with reference to exemplary embodiments, but it is understood that the words which have been used are words of description and illustration, rather than words of limitation. Modifications may be made to the invention as defined in the appended claims, and the invention may be modified without departing from the scope and spirit of the invention. Although the invention is described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, as the invention extends to all other means and applications which perform the same function.
Claims (16)
1. A preparation method of a high-density solid-free weighting agent comprises the following steps:
s1, dissolving a first soluble weighting material and a second soluble weighting material in a solvent, preferably water, to obtain a solution A;
s2, adding a pH regulator into the solution A to obtain a solution B with the pH value of 8-9.5;
s3, performing first heat treatment on the solution B to obtain a solution C;
s4, cooling the solution C, and adding an adhesion promoter, an deoxidizer and a chelating agent into the cooled solution C to obtain a solution D;
s5, performing second heat treatment on the solution D to obtain a solution E;
s6, heating the solution E to remove a liquid phase to obtain a solid phase; and
s7, drying and granulating the solid phase in turn to obtain the high-density solid-free weighting agent,
in step S1, the first soluble weighting material is at least one of potassium phosphate, dipotassium hydrogen phosphate, potassium tripolyphosphate and potassium pyrophosphate, and the second soluble weighting material is at least one of sodium formate and potassium formate;
the weight parts of the components are as follows:
the tackifier is at least one selected from low-viscosity carboxymethyl cellulose (LV-CMC), high-viscosity carboxymethyl cellulose (HV-CMC), low-viscosity polyanionic cellulose (LV-PAC), high-viscosity polyanionic cellulose (HV-PAC), xanthan gum (XC), hydroxyethyl cellulose (HEC) and sulfonate copolymer;
the chelating agent is at least one selected from sodium gluconate, disodium edetate, sodium tartrate and sodium citrate.
2. The method of preparing according to claim 1, wherein the total amount of the first soluble weighting material and the second soluble weighting material is 55 to 200 parts.
3. The method of preparing according to claim 2, wherein the total amount of the first soluble weighting material and the second soluble weighting material is 100 to 200 parts.
4. The method of claim 3, wherein the total amount of the first soluble weighting material and the second soluble weighting material is 120 to 180 parts.
5. The method according to any one of claims 1 to 4, wherein the pH adjuster is selected from at least one of sodium hydroxide and potassium hydroxide; and/or the deoxidizer is at least one selected from thiourea, sodium thiosulfate and sodium sulfite.
6. The method according to any one of claims 1 to 4, wherein in step S3, the conditions of the first heat treatment include: the temperature is 70-110 ℃ and the time is 1-6 h.
7. The method according to claim 6, wherein the first heat treatment time is 2 to 4 hours.
8. The method according to any one of claims 1 to 4, wherein in step S5, the conditions of the second heat treatment include: the temperature is 70-100 ℃ and the time is 1-8 h.
9. The method according to claim 8, wherein in step S5, the second heat treatment is performed for a period of 2 to 6 hours.
10. A high density solid free weighting agent made according to the method of any one of claims 1-9.
11. A high density solid free weighting agent solution comprising the high density solid free weighting agent of claim 10 and water.
12. The high density solid free weighting agent solution of claim 11 which has a density of 1.317g/cm at 30 ℃ 3 ～1.715g/cm 3 。
13. The high density solid free weighting agent solution of claim 12 which has a density of 1.534g/cm at 30 ℃ 3 ～1.715g/cm 3 。
14. The high density solid free weighting agent solution of any one of claims 11-13 wherein the pH of the high density solid free weighting agent solution is 8.0 to 9.0.
15. Use of a high density solid free weighting agent according to claim 10 or a high density solid free weighting agent solution according to any of claims 11-14 in a drilling fluid.
16. Use according to claim 15, as drilling fluid additive.
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