34results about How to "Improve anti-slump performance" patented technology

The invention discloses a type of construction slurry for rotary pile drilling. The slurry is a type of compound slurry comprising water, bentonite, hydroxypropyl methyl cellulose solution, clay and soda ash. The construction slurry provided by the present invention can be widely applied in fields of well drilling, rotary pile drilling, and underground diaphragm wall. During a preparing process, the slurry can be mixed quickly and well. The slurry also has advantages of high efficiency, low pollution, low energy consumption and low cost.

The invention relates to a process for preparing drilling fluid, in particular to a process for preparing the drilling fluid for preventing polycrystalline diamond compact (PDC) bit balling. The process comprises a construction process and a dosage formula of treating agents and is characterized in that: according to the dosage formula, the treating agents are prepared by mixing clear water polymer original slurry, poly anionic cellulose (PAC), calcium carbonate (QS-4), carboxymethyl starch (CMS), sulfonated phenolic resin(SMP-2), water dispersible cation emulsified asphalt powder (SFT-1), sodium chloride(NaCL) and sodium formate (WT-1) in a mass ratio of 1,000:2-3:30-40:20-30:2-3:1.5-2:50-100:20; and the construction process comprises the following steps of: according to a circulation circle, uniformly mixing a coating agent PAC, a filtrate reducer CMS, a salt and high-temperature resistant filtrate reducer SMP-2 and an anti-sloughing lubricant SFT-1 for 12h at first; adding QA-4, NaCL, WT-1 into the mixture and uniformly mixing the mixture; and regulating the mixture to have a density Rho of 1.06 to 1.10g/cm<3>, a funnel viscosity T of 38 to 45s and an API water loss FL of 4 to 6ml. The process has the advantages of effectively preventing the balling of a sticking bit and a PDC bit at a lower curved section, reducing a frictional resistance and a torque, eliminating a sticking phenomenon, improving a mechanical drilling rate and ensuring downhole safety.

The present invention relates to the technical field of chemical oil field drilling fluids, and in particular discloses a silicate-aluminate system anti-sloughing drilling fluid, the drilling fluid is prepared from raw bentonite base slurry, a viscosity and shear strength improving agent, a filtrate loss reducer A, a high temperature filtrate loss reducer B, a flow type regulator, an organic inhibitor, an inorganic salt, a plugging agent, sodium hydroxide, barite, a silicate and sodium metaaluminate, by compounding of the low modulus silicate and the aluminate, in the conversion process of filtrate from high pH value environment to neutral environment, the low modulus silicate and the aluminate generate a silicate gel and a new material aluminosilicate precipitate to play chemical wall fixing and physical formation plugging roles, namely an inorganic mineral dense blocking layer is formed immediate vicinity of a wellbore, the collapse pressure of an easy-to-slump formation can be significantly reduced, the bearing capacity is effectively improved, anti-sloughing inhibition capacity of the drilling fluid can be improved, and the silicate-aluminate system anti-sloughing drilling fluid can better satisfy the requirements of borehole wall stability and safe drilling, and achieves the purpose of inhibiting, plugging and chemical wall fixing.

The invention provides a wall fixing agent for drilling fluid as well as a preparation method and application of the wall fixing agent and belongs to the technical field of drilling fluid. The wall fixing agent for the drilling fluid is prepared from the following raw materials in parts by weight: 10 to 25 parts of acrylamide; 10 to 25 parts of an adhesive; 10 to 25 parts of dimethyl diallyl ammonium chloride; 1 to 5 parts of acrylic acid; 1 to 5 parts of 2-acrylamide-2-methylpropanesulfonic acid; 1 to 5 parts of a chain transfer agent; 2 to 5 parts of an initiator; 5 to 12 parts of sodium hydroxide; and 80 to 100 parts of distilled water. According to the wall fixing agent provided by the invention, the strength of well wall rock is improved by enhancing cohesive force and adhesive forceamong rock particles, so that the anti-collapse performance of the drilling fluid is improved. Particularly, the hydration force and the like of the shale during hydration expansion can be weakened orcompletely counteracted by the cohesion of a bionic shell, so that the stability of a well wall is improved, and the wall fixing agent has relatively good adhesion performance in a water environment.

The invention discloses an organic-inorganic composite silicate high-temperature-resistant film-forming drilling fluid system, relates to drilling fluid, and belongs to the technical field of geological resource exploration and development. The drilling fluid system comprises bentonite base slurry, thickening agents, filtrate reducers, blocking agents, weighting agents, inorganic silicate and organic silicate, the dosage of raw materials is calculated according the weight of the bentonite base slurry, the weight percent of the bentonite base slurry is 1%-4%, the concentration of the organic silicate is 0.05mol/L-0.5mol/L, and the weight percent of the inorganic silicate is 0.1%-5%. According to the organic-inorganic composite silicate high-temperature-resistant film-forming drilling fluidsystem, the inhibition and anti-collapse ability of the drilling fluid is improved, the requirements of borehole stability and safe drilling are more effectively met, and inhibition, blocking and chemical wall fixation are achieved.

The invention discloses a construction method of an underground diaphragm wall in a water-rich silty-fine sand layer. The construction method comprises the following steps of guide wall construction,tube well advanced precipitation, slurry preparation, grooving, groove cleaning and slurry replacement, wall brushing, reinforcement cage manufacturing, reinforcement cage hoisting, sand prevention layer arrangement and concrete pouring. According to the construction method of the underground diaphragm wall in the water-rich silty-fine sand layer, firstly, the self-stability of groove walls is improved through advanced precipitation of tube wells in a foundation pit which are constructed in advance; and during grooving, sodium bentonite is adopted for slurry manufacturing, and thin and tough slurry cakes are formed on the groove walls, so that the collapse resistance is improved.

The invention provides an anti-collapse agent of zwitterionic emulsified asphalt for drilling fluid. The anti-collapse agent comprises the following raw material components in percentage by weight: 20.0-35.0% of industrial additive oil, 15.0-30.0% of asphalt, 7.0-18.0% of sulfonated asphalt, 0.4-0.8% of dodecyldimethylsulfopropyl betaine, 1.0-2.0% of organic stabilizer, 8.0-15.0% of aviation kerosene and 5.0-42.0% of water. According to the invention, an emulsifying agent is reselected, the organic stabilizer is also added, so that the anti-collapse agent has anti-collapse performance and relatively high storage stability and is capable of avoiding the layering phenomenon; the anti-collapse agent can be used for obtaining high-quality products by adding relatively few raw materials and has relatively strong anti-frost property; the quality of the products can be regulated within a certain range, and the anti-collapse agent has a wide market popularization value.

The invention provides an environment-friendly anti-collapse plugging drilling fluid as well as a preparation method and an application thereof, which belong to the field of drilling fluids for petroleum drilling engineering. The invention provides the environment-friendly anti-collapse plugging drilling fluid, which comprises: 100 parts of water, 1-3 parts of sodium bentonite, 0.2-0.4 parts of apH value regulator, 0.3-0.5 part of a glue protecting agent, 0.1-0.2 part of a coating agent, 1-2 parts of a filtrate reducer, 4-6 parts of inorganic salt, 1-3 parts of an inhibitor, 1-3 parts of a lubricant, 2-4 parts of a blocking agent, 0.3-0.8 part of an anti-collapse agent, 0.1-0.15 part of a flow pattern regulator and 0-100 parts of a weighting agent. The drilling fluid provided by the invention is good in rheological property and filtrate loss reduction property, the HTHP filtrate loss and PPT filtrate loss at 150 DEG C are remarkably reduced, a mud cake is thin and compact, borehole wall instability caused by pore pressure increase due to the fact that too much drilling fluid filtrate enters a stratum can be prevented, and the drilling fluid is non-toxic and easy to degrade.

The invention discloses a method for preparing a multifunctional lubricant of drilling fluid by using waste oil. The method comprises the following steps: (1) firstly, weighing the waste oil and putting into a reactor, and putting the reactor into an electrothermal constant-temperature water bath kettle; (2) then weighing liquid SO3 and putting into a dropping funnel, in order to change the liquid SO3 dripping from the dropping funnel into a gas SO3, and keeping a gas generator connected with the dropping funnel at 50-70 DEG C by a thermal cycling effect of a jacket water bath; (3) mixing with N2 before the gas SO3 enters a reactor; and (4) controlling the reaction temperature at 50 DEG C, enabling the gas SO3 to react with the waste oil for 2-4 hours, and then adding an organic alkali to the reactor, adjusting the pH to 8-9, and then adding a composite surfactant to the reactor, so as to obtain the lubricant after agitating for 3-10 minutes. Compared with the similar lubricant, the lubricant prepared by the method disclosed by the invention is simple in production technology, and low in cost, has good high-temperature extreme pressure lubricity, also has good fluid loss effect and anti-collapse performance, and is applicable to horizontal well and complicated stratum drilling.

The invention relates to a polyalcohol anti-collapse inhibitor for a drilling fluid salt slurry system and a preparation method of the polyalcohol anti-collapse inhibitor for the environment-friendlydrilling fluid salt slurry system. The preparation method comprises the following preparation steps: (1) weighing ethylene oxide or/and propylene oxide, ethylene glycol or glycerol as reactants, uniformly stirring the components at room temperature, and slowly pouring the mixture into a high-pressure reaction kettle; (2) adding a proper amount of catalyst, continuously introducing nitrogen for protection, controlling the reaction temperature at 75-125 DEG C and the pressure at 0.1-0.3 MPa, and continuously stirring the components; (3) after reaction for 60 minutes, opening a safety relief valve, removing residual pressure in the high-pressure reaction kettle, and discharging a synthetic product everywhere; (4) washing the by-product and redundant reactants with distilled water or a hydrochloric acid solution or NaOH solution with the concentration of 0.1% until the pH value is neutral; and (5) removing water from the product obtained in the step (4) to obtain the polyalcohol anti-collapse inhibitor. The product has excellent anti-sloughing inhibition performance, and the lubricity of the drilling fluid is remarkably improved.

The invention discloses a preparing method of a fiber mat. With elastomer fiber as the raw material, unit fiber layers with upper tension surfaces, lower tension surfaces and middle layers are formedthrough the steps of opening, carding, lapping, needling and the like, the overlapped unit fiber layers are hot-pressed, and finally the finished fiber mat of a multi-layer tension surface structure is prepared. The fiber mat prepared through the method has the multi-layer tension surface structure, the pressure exerted on the fiber mat can be buffered by multiple stages, the anti-collapsing performance is greatly improved, the light weight of the fiber mat is ensured, no glue is used in the production process, and no harm is caused to a human body.

The invention relates to potassium salt polymer drilling fluid and belongs to the field of oilfield chemistry. The potassium salt polymer drilling fluid is characterized by containing the following substances in percentage by weight: 3-10% of clay, 1-8% of weighting material, 1-3% of sulfonated lignin sulfomethyl phenol-formaldehyde resin copolymer, 1-1.5% of potassium polyacrylate, 1-2% of potassium chloride, 1-4% of lubricant and the balance of tap water. According to the potassium salt polymer drilling fluid, proportioned materials are simple and are readily available, and the potassium salt polymer drilling fluid has the advantages of high inhibition capability, calcium resistance, salt resistance and collapse prevention and is applicable to oil wells of various depths.

The invention belongs to the technical field of oilfield chemical drilling fluid treating agents, and provides a modified alkyl glycoside high-temperature-resistant strong inhibitor and a preparation method and application thereof. The preparation method comprises the following steps: subjecting halogenated epoxide, polymeric glycol and alkyl glycoside to reacting under catalysis of an acid catalyst so as to obtain halogenated alcohol polyether alkyl glycoside; subjecting the halogenated alcohol polyether alkyl glycoside to reacting with organic amine to obtain amino polyether alkyl glycoside; and subjecting the amino polyether alkyl glycoside to reacting with sulfamic acid serving as a sulfonating agent to generate the modified alkyl glycoside high-temperature-resistant strong inhibitor. The modified alkyl glycoside provided by the invention comprises an alkyl glycoside group, a hydroxyalkyl group, a polyether group, an amido group and a sulfonic acid group, and has a relatively good collapse inhibition effect under a high-temperature condition. In addition, the modified alkyl glycoside provided by the invention has no biotoxicity. The modified alkyl glycoside provided by the invention can be applied to drilling fluids, is suitable for drilling construction of formations such as deep wells and ultra-deep wells with relatively high formation temperature and with shale easy to collapse, and meets the requirements for well wall stability and environmental protection of high-temperature formations.

The invention discloses a method for treating potassium amino polysulfonate drilling fluid, and relates to the technical field of drilling fluid. The method comprises the following steps: (1) geological general situation research: before drilling fluid treatment, firstly researching the drilling depth of a drilling position and the geological condition of the drilling position, and according to the difference between the drilling depth and the geological condition, targetedly formulating a drilling fluid formula of the potassium amine polysulfonate drilling fluid, wherein the drilling fluid formula specifically comprises a formula I, a formula II, a formula III and a formula IV, (2) preparation of the potassium amine polysulfonate drilling fluid; and (3) construction of the potassium amine polysulfonate drilling fluid. The treatment method of the potassium amine polysulfonate drilling fluid is suitable for petroleum drilling in mesozoic and paleozoic stratums, and during preparation, a drilling fluid treatment agent is added according to the sequence of a fluid loss agent, a 30% coating agent, an inhibitor and a 70% coating agent. The particle size distribution is wide according to the adding sequence, effective accumulation of clay particles is facilitated, a compact filter cake is formed, and the filtration wall-building performance and the rheological property are both good.

The invention relates to the field of reducing the fluid loss of drilling fluid under high calcium and high temperature, and discloses a random copolymer, a preparation method and application thereof, a drilling fluid and a method for reducing the fluid loss of the drilling fluid. This random copolymer contains structural unit (A) shown in formula (1), structural unit (B) shown in formula (2), structural unit (C) shown in formula (3), and formula (4) Or the structural unit (D) represented by formula (5), X is a halogen. The random copolymer is used as a fluid loss reducer in drilling fluids to reduce the fluid loss of drilling fluids containing high calcium ions.

The invention belongs to the technical field of deep well and ultra deep well mining, and discloses a shale inhibitor multi-branched polyamine for drilling fluid and a preparation method thereof. Theinhibitor is prepared from the following raw materials in parts by weight: 30-40 parts of aliphatic amine, 30-40 parts of propylene oxide (PO), 20-30 parts of a butylene oxide (BO), and 20-30 parts ofa reactive group compound. The shale inhibitor is arranged in a single molecule between clay layers; in addition to the electrostatic interaction force between the inhibitor and the clay layers, theinhibitor forms hydrogen bonds with siloxane-based atoms of a clay crystal face; the inhibitor can also be combined with other treatment agents to form a synergistic effect, and through the combination with a physical plugging method and a chemical plugging method, the strength of the rock formation around the borehole wall is effectively increased, and the problem of swelling of mud shale is solved. The shale inhibitor multi-branched polyamine has a good capability of inhibiting clay from making mud, and the reduction rate of clay mud-making inhibition with the single-agent inhibitor can reach 70% or more than 70%.