15 results about "Wellbore instability" patented technology

The invention relates to the technical field of geologic model analysis, in particular to a coal bed gas fracturing three-dimensional well network seam network design method based on a geologic model, and the method comprises the steps: firstly constructing a three-dimensional discrete geologic model containing grid node mechanical parameters, and generating a three-dimensional dynamic induced stress potential energy tensor field; performing low-potential-energy gradient optimization calculation by using the field to obtain a shaft space topological coordinate avoiding a high-potential-energy area so as to reduce the well wall instability risk; meanwhile, fracture extension simulation is cut off through an equipotential surface threshold value in the field, and hydraulic fracture geometrical morphology parameters matched with formation energy constraint are accurately determined; and finally, integrating the parameters to generate an optimized three-dimensional well pattern seam network design scheme, and realizing efficient and safe fracturing design based on the rock mass accumulated deformation energy distribution characteristics.

This invention provides a method for preparing a polyamine that combines inhibition and solid-phase cleaning effects. Compared with existing technologies, the polyamine prepared by this invention exhibits better inhibitory and solid-phase cleaning effects under high-temperature conditions, and also demonstrates better compatibility in drilling fluids. Its application in drilling fluids can effectively solve the wellbore instability problem in highly water-sensitive shale formations, and effectively avoid drilling fluid slurry formation problems caused by drill cuttings hydration, thus ensuring wellbore stability and drilling fluid cleanliness.

This invention belongs to the field of natural gas extraction technology in deep thin coal and rock formations. It discloses a directional anti-sticking drill string assembly and drilling method for horizontal wells in deep thin coal and rock formations. A closed-loop control system is formed between the drill bit trajectory control mechanism and the wellbore dressing and anti-sticking mechanism, encompassing near-bit high-precision sensing, real-time data transmission while drilling, surface analysis feedback control, active downhole directional correction, and synchronous wellbore dressing and protection. Multi-directional gamma sensors positioned near the drill bit provide high-resolution formation information; the bend structure of the downhole power drill string provides the direction of the wellbore trajectory; the non-magnetic bearing section ensures the stability of measurement while drilling and the reliability of communication; the surface control unit enables real-time decision-making and trajectory correction; and the wellbore dressing and anti-sticking mechanism simultaneously improves wellbore stability and cuttings carrying capacity. This significantly enhances the drilling throughput and resistance to coal seam collapse in complex sections of thin coal and rock formations while ensuring trajectory controllability, reducing the risk of sticking due to wellbore instability and cuttings accumulation.

This invention discloses an inhibitory water-based foam drilling fluid system to solve the wellbore instability problem currently existing in foam drilling. The system comprises 0.5%-1.0% fluorocarbon foaming agent, 0.2%-1.0% inhibitor, 0.04%-0.2% foam stabilizer, 0.2%-0.4% thickener, 1.0%-5.0% bentonite, and water as the balance. The fluorocarbon surfactant is a fluorocarbon surfactant containing a quaternary ammonium salt cationic structure, the inhibitor is a small-molecule amine salt structure inhibitor, and the large-molecule foam stabilizer is one or more combinations of starch, cellulose, and polyacrylamide. The foaming agent provided by this invention, when applied in foam drilling, possesses both strong foaming and inhibitory properties.

The invention provides a CaCO3 / polymer-based plugging agent, a preparation method thereof and a water-based drilling fluid, the preparation method of the CaCO3 / polymer-based plugging agent comprises the following steps: S1, synthesizing CaCO3 in the presence of a modifier to obtain modified CaCO3; s2, taking the modified CaCO3 and a functional monomer as raw materials, adding a cross-linking agent, an initiator and a dispersing agent, and synthesizing a CaCO3 / polymer-based plugging agent by adopting a reversed-phase suspension polymerization method; wherein the functional monomers are styrene, acrylamide and N-vinyl pyrrolidone. The water-based drilling fluid based on the CaCO3 / polymer-based plugging agent is low in cost, has a good plugging effect, has temperature resistance and pressure bearing performance, and can solve the problem of well wall instability of a high-temperature well section.

The present disclosure provides a wellbore instability analysis method based on big data, which relates to the field of wellbore instability. The wellbore instability prediction based on big data analysis and deep learning, combined with existing wellbore instability theory and experimental research results, finds the main control factors and related factors of wellbore instability in the studied block. Based on data classification, a big data model is established to improve the accuracy of analysis and prediction through big data learning. Through the application of the big data model, the deep learning technology is used for regional wellbore instability evaluation and research, and finally the regional wellbore instability evaluation and prevention technology based on big data is formed. The wellbore instability analysis tool based on big data analysis mainly provides the safety density window for preventing wellbore instability, the control analysis of hole diameter change, the optimization of drilling fluid performance and additive dosage, adjacent well data analysis, ECD analysis and drilling time effect analysis through data analysis, so as to reduce the hydration swelling effect of the target formation rock and prevent wellbore instability. The present disclosure is suitable for wellbore instability prediction.

The invention belongs to the technical field of petrochemical engineering, and provides a deepwater superficial portion hydrate-containing stratum borehole stabilizer and a preparation method and application thereof. The deepwater superficial portion hydrate-containing stratum borehole stabilizer comprises a copolymer of a vinyl lactam monomer, acryloyl dopamine and a derivative of the acryloyl dopamine; the preparation method comprises the following steps: dissolving dopamine and a derivative thereof in a solvent, adjusting to be alkaline, adding an acrylic acid derivative with an acrylic acid or methacrylic acid group, reacting, dissolving the obtained acryloyl dopamine in a solution, mixing and dissolving with a vinyl lactam monomer and an initiator, and carrying out copolymerization reaction. After being added into a drilling fluid, the deepwater shallow hydrate-containing formation well wall stabilizer disclosed by the invention can play a multi-functional role, not only can improve the cementing property between hydrates and mineral particles and between mineral particles in a formation and improve the pressure-bearing strength of the formation, but also can inhibit the decomposition of the hydrates in the formation and the reduction of the strength of the formation, so that the drilling fluid can be well protected. And the well wall instability risk is reduced.

The invention provides a rock debris image data processing method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring rock debris image data and carrying out image segmentation processing to obtain rock debris classification data and a mask pattern; calculating the mask pattern to obtain rock debris particle size distribution data; performing shape analysis processing according to the rock debris particle size distribution data to obtain rock debris shape characteristic data; performing rock debris contour calculation on the mask pattern to obtain shape category data; performing visualization processing on the rock debris particle size distribution data to obtain a rock debris particle size distribution diagram, and performing rock debris particle block length ratio distribution diagram on the rock debris shape characteristic data; and performing visualization on the shape category data of the rock debris particle blocks to judge the instability condition of the well wall of the current drilling well. The efficiency and objectivity of rock debris classification and particle size calculation are remarkably improved through automatic images; comprehensive quantification of physical attributes of the rock debris is realized based on particle size and shape conjoint analysis, one-sidedness of a traditional method is avoided, and analysis precision and classification accuracy are effectively improved.

This invention relates to the field of drilling fluid treatment agents, and discloses a formulation with reduced filtration loss properties, its preparation method, and its application. The method includes: (1) mixing an organic solvent, an oil-phase matrix material, and an organic hydrophilic modifier to carry out a first modification reaction, wherein the oil-phase matrix material is selected from asphalt and / or resin; (2) adding graphene material to the system obtained in step (1) to carry out a second modification reaction. The formulation prepared by this method can not only quickly form an oil film on the wellbore to seal cracks, but can also be widely used in well sections prone to wellbore instability at 60-120℃, while also effectively improving the lubrication performance of drilling fluids.

The present application belongs to the technical field of oil and gas drilling engineering, and particularly relates to a polymer-coated inhibitor for strong inhibition drilling fluid and a preparation method thereof; the inhibitor is prepared by aqueous solution polymerization of acrylamide, acrylamidomethylpropane sulfonic acid, dimethyldiallylammonium chloride, vinyltrimethoxysilane and two novel inorganic modified compounds. The two inorganic modified compounds are a titanate intercalated magnesium aluminum tin silicate nanocomposite and a polyoxometalate grafted rare earth doped cerium dioxide nanorod, respectively. The former is prepared by coprecipitation and intercalation reaction, and the latter is prepared by hydrothermal synthesis and graft modification. The present application significantly improves the hydration inhibition capacity for shale, and can still maintain stable coating effect in high temperature and high salt environment, effectively solving the problem of wellbore instability. The preparation method is simple in process, the raw materials are all commercially available, and is suitable for industrial production, and has a broad application prospect in the field of water-based drilling fluid.

The invention discloses a fractured stratum modeling method for establishing a cluster template through three-dimensional scanning, which comprises the following steps: step 1, generating a real rock contour through three-dimensional scanning of a real rock sample, and establishing a basic flexible cluster template; 2, establishing a discrete element parameter calibration model, and simulating to obtain various mechanical parameters of the rock sample; step 3, establishing a real fractured stratum model; and 4, extracting a crack network structure by utilizing the well wall instability model in discrete element simulation, and further controlling the well wall instability phenomenon influenced by the well wall. According to the method, the contour of the rock block is obtained through three-dimensional scanning, the stratum model is constructed through the basic principle of the discrete element method, the cementation characteristic of the rock is restored, fracture of the rock block is simulated through Cluster, the particle crushing effect is reflected, namely, a more accurate crushed stratum well wall model is established, and the model is applied to the field of well wall construction. And the evaluation of the instability characteristics under the conditions of different fractured stratums, different fracture development degrees and the like can be realized.

The invention discloses a borehole wall stability analysis and risk evaluation method based on a quasi Monte Carlo method, and relates to the technical field of petroleum and natural gas drilling, and the method comprises the following steps: carrying out data cleaning and preprocessing on multi-source parameters, and carrying out parameter distribution modeling to obtain a multi-parameter joint probability distribution model; a quasi-Monte Carlo sampling method is utilized to obtain large-scale parameter combination samples with uniform sample coverage, and well wall stress, collapse conditions and fracture conditions are calculated to obtain collapse coefficients and fracture coefficients under each sample; performing variance decomposition according to a corresponding relation between each input parameter and a borehole wall instability result, identifying key control factors, constructing a training sample set, and training the long-short-term memory neural network model; and inputting related parameters obtained in an actual drilling process into the trained long-short-term memory neural network model to obtain a borehole wall stability result. By implementing the method provided by the invention, the accuracy and reliability of borehole wall stability analysis and risk prediction can be improved.

The present application relates to the technical field of oil reservoir engineering, and is a formation borehole wall stability evaluation method and device based on mineral logging technology, which comprises the following steps: obtaining the volume content of water-sensitive minerals in a mudstone sample of a formation to be evaluated; determining the water absorption rate of each water-sensitive mineral; calculating the plastic water-sensitive strength of the mudstone mineral based on the volume content and water absorption rate of the water-sensitive mineral; and evaluating the formation borehole wall stability based on the plastic water-sensitive strength of the mudstone mineral. The present application is based on the water sensitivity mechanism of minerals, combines X-ray diffraction mineral logging technology with well diameter curves, establishes a wellbore instability grade standard for water-sensitive formations, and is verified by well diameter logging, which is highly reliable, has the characteristics of timely and efficient data acquisition while drilling, and is highly applicable in the field. The present application is not only suitable for mud shale, but also can be extended to other water-sensitive tight sand-shale formations, and has a wide application range.

The invention provides an integrated preparation method of microwave-assisted deep-eutectic solvent extraction-in-situ carboxymethylation modified cellulose, the modified cellulose and application. The preparation method comprises the following steps: (1) mixing choline chloride, urea and a modifier sodium chloroacetate, heating and stirring to form a uniform transparent liquid, and cooling to room temperature to obtain a deep eutectic solvent ternary system; (2) adding a biomass raw material into the eutectic solvent ternary system, and carrying out microwave treatment; and precipitating, centrifuging, washing and drying the obtained reaction liquid to obtain the modified cellulose. According to the method, raw material pretreatment, cellulose extraction and carboxymethylation reaction are integrated in a single reaction system, the technological process is remarkably simplified, the production cost is reduced, meanwhile, the product performance and environmental friendliness are improved, excellent performance is shown in the fields of oil field drilling fluid and the like, and the well wall instability risk is reduced.