The invention relates to a method for integrating natural gas recovery efficiency increasing through CO2 waste gas reinjection with CO2 geological storage and belongs to the technical field of natural gas resource exploitation and CO2 emission reduction. The method is characterized by including: subjecting primary natural gas recovered by a gas recovery well to purification treatments such as dewatering, desulfurization and decarbonization to produce pure natural gas and the CO2 waste gas; conveying part of the pure natural gas to a gas-steam combined generator set of a natural gas power plate near a gas field for combustion power generation whose heat efficiency can reach 57%; performing CO2 capture on the flue gas after combustion to obtain the CO2 waste gas; conveying the CO2 waste gas captured from the flue gas and the CO2 waste gas separated by purification treatment to a pressurization and thermoregulation system for pressurization and thermoregulation to reach a supercritical state; injecting the supercritical CO2 to the bottom of a natural gas reservoir through a reinjection well to displace natural gas to move towards the gas recovery well and output. The method has the advantages that natural gas output is increased, overall recovery efficiency and energy utilization rate are increased, and the CO2 is stored in the geological structure of the gas reservoir to achieve energy conservation and emission reduction.

Method for integrating natural gas recovery efficiency increasing through CO2 waste gas reinjection with CO2 geological storage

The invention belongs to the technical field of coal bed gas exploitation and particularly relates to a coal bed gas exploitation method. According to the coal bed gas exploitation method, on one hand, electricity is generated through a high-concentration gas power generating set by using coal bed gas produced through a horizontal well to maintain the daily drainage and exploitation operation of a vertical shaft and the operation of a peripheral compressed natural gas pressure station; on the other hand, after carbon dioxide in the tail gas of the high-concentration gas power generating set is purified and compressed into a certain amount of liquid carbon dioxide through a carbon dioxide processing and pumping device, the liquid carbon dioxide is pumped into the vertical well in an intermittent injection mode, and thus the double effects of environment protection and production increase are achieved.

Coal bed gas exploitation method

The invention provides environment-friendly water-based drilling fluid and a preparation method thereof. The water-based drilling fluid is prepared from the following raw materials in parts by weight: 100 parts of water, 1-5 parts of bentonite, 0.05-0.4 part of sodium carbonate, 0.5-3 parts of a filtrate reducer A, 0.2-3 parts of a filtrate reducer B, 0.1-1 part of a viscosity/yield boosting agent, 0.5-4 parts of an inhibitor, 1-5 parts of a lubricant, 2-6 parts of a micro/nano particle plugging agent and 0-200 parts of weighting materials. The preparation method of the drilling fluid comprises the steps of adding bentonite and sodium carbonate into water; sequentially adding the filtrate reducer A, the filtrate reducer B, the viscosity/yield boosting agent, the inhibitor, the lubricant and the micro/nano particle plugging agent; adjusting the pH value by using sodium carbonate; selectively adding the weighting materials until the density reaches the drilling requirements. The resisting temperature of the drilling fluid can reach 150 DEG C, EC50 is greater than 3.0*10 mg/L, and the drilling fluid is nontoxic and environmentally friendly and has good rheological property, filtration reducing property, rejection capability, lubricating property, pollution resistance and reservoir protection effect.

Environment-friendly water-based drilling fluid and preparation method thereof

The invention provides a drilling fluid suitable for a compact sandstone reservoir The drilling fluid comprises the following components by mass percent: 05-2 percent of bentonite, 05-25 percent of a encapsulating/inhibiting agent, 05-1 percent of a flow pattern regulator, 3-4 percent of a fluid loss additive, 04-08 percent of an anti-water-blocking agent, 4-10 percent of a temporary plugging agent, 40-50 percent of LRID, 0-50 percent of a weighting agent and the balance of water The drilling fluid has the density of 116 g/cm -155 g/cm  The drilling fluid suitable for the compact sandstone reservoir can effectively prevent the compact sandstone reservoir from pollution and ensure safe downhole operation

Drilling fluid suitable for compact sandstone reservoir

The invention provides a method for evaluating a blocking effect of a nanometer material. The method comprises the following steps: preparing a mud cake with physical properties similar to the physical properties of shale under different physical and chemical conditions; utilizing the prepared shale to simulate the shale; evaluating the blocking property of the nanometer drilling fluid. The result of evaluating the blocking property of the nanometer drilling fluid by using the mud cake for simulating the shale is direct. Besides, compared with the direct usage of the shale, the simulation for the shale by using the mud cake has the advantages of lower cost, simple operation and lower requirement on test instruments. The mud cake can be prepared in large scale and the test repeatability is strong.

Method for evaluating blocking effect of nanometer material

The invention provides a method of utilizing nanometer silicon dioxide to improve properties of water-based drilling fluid at different temperatures. The method comprises a step of adding a nanometer silicon dioxide dispersing agent into base mud, wherein the mass of the nanometer silicon dioxide particle in the nanometer silicon dioxide dispersing agent is 5-10% of total mass of the base mud and the nanometer silicon dioxide dispersing agent. Due to the nano-scale particle size, the nanometer silicon dioxide material can be filled into small holes and cracks of the shale stratum to improve the plugging effect of the water-based drilling fluid, slow down the trend of permeation of the drilling fluid to the stratum and expansion and chipping of the stratum after water absorption, and improve the stability of the borehole wall. The nanometer silicon dioxide can strengthen the stability of fresh-water base mud and bentonite base mud by increasing the negative charge level of the system. The nanometer silicon dioxide also can enable the base mud to form thinner and compact mud cakes and facilitate the de-filtration effect to be obvious.

Method of utilizing nanometer silicon dioxide to improve properties of water-based drilling fluid at different temperatures

The invention provides a method for enhancing recovery ratio of coal-bed gas by injecting hot carbon dioxide into a coal bed, which comprises the following steps: 1) after implementing a coal-bed gas multi-branch horizontal well on the ground, draining water of a single well to reduce the pressure, and naturally generating gas until the yield is lower than the industrial gas flow standard; 2) draining water to reduce the pressure, and injecting hot carbon dioxide into the well, wherein the temperature of the injected hot carbon dioxide is 180-220 DEG C, and the injection pressure does not exceed 5 MPa; 3) shutting in the gas well for soaking; 4) draining water to reduce the pressure, and generating gas; 5) separating carbon dioxide and coal-bed gas from the generated gas; and 6) repeating the steps 2)-5) until the yield is lower than the industrial gas flow standard, and shutting in the well The method provided by invention can effectively lower the coal-bed methane content and greatly enhance the coal-bed gas yield, thereby achieving the goal of industrialized development of coal-bed gas

Method for enhancing recovery ratio of coal-bed gas by injecting hot carbon dioxide into coal bed

The invention provides a degradable drilling fluid based on a nano material. The degradable drilling fluid consists of a drilling fluid unit and a blocking-preventing liquid unit and is characterized by comprising the following ingredients in parts by mass according to the addition amount in every 100 parts of water: 2-3 parts of bentonite, 0.25-0.5 part of a thickening agent, 1-2 parts of a filtrate reducer, 2.5-5 parts of sylvite, 2.5-5 parts of nano calcium carbonate, 0.5 part of a composite dispersing agent, and a pH value adjusting agent, wherein the pH value of the drilling fluid is adjusted to be neutral through the pH value adjusting agent, and the blocking-preventing liquid unit comprises biological enzyme and hydrochloric acid. By utilizing the degradable drilling fluid, nanoscale pores of coal can be temporarily blocked in the drilling process of low-porosity and low-permeability coal bed gas, the damage of the drilling fluid to a coal reservoir is reduced, and moreover the permeability recovery value of the coal is as high as 80-95% after biological enzyme degradation hydrochloric acid acidizing treatment.

Degradable drilling fluid based on nano material

The invalidation of CaCO3 nanoparticles (nCaCO3) is often caused by the fact of agglomeration and inhomogeneous dispersion which limits its application into water-based drilling muds for low permeability reservoirs such as coalbed methane reservoir and shale gas/oil reservoir. Effective methods to disperse nCaCO3 to nano-size (≤ 100 nm) in water have seldom been reported. Here we developed a compound method containing mechanical stirring, ultrasonic treatment, the use of surfactant and stabilizer to disperse nCaCO3 in water. It comprises the steps adding 2% nCaCO3, 1% sodium dodecyl sulfonate (SDS), 2% cetyltrimethyl ammonium bromide (CTAB), 2% OP-10, 3% to 4% biopolymer (XC) in water successively, stirring it at a shear rate of 6000 to 8000 r/min for 15 minutes and treating it with ultrasonic at a frequency of 28 KHz for 30 to 40 minutes. The dispersed nCaCO3 was characterized with scanning electron microscope (SEM), transmission electron microscope (TEM) and particle size distribution (PSD) tests. We found that nCaCO3 could be dispersed to below 100 nm in water and the medium value of nCaCO3 was below 50 nm. This method paved the way for the utilization of nCaCO3 in drilling fluid and completion fluid for low permeability reservoirs such as coal seams and shale gas/oil formations.

Compound Method to Disperse CaCO3 Nanoparticles to Nano-Size in Water.

Method for dispersing nano calcium carbonate powder material in aqueous solution

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