33results about How to "Reduce the draining speed" patented technology

The invention relates to a self gas generation foam-gel profile control agent prepared from oilfield reinjection water and a preparation method and an application of the agent. The self gas generation foam-gel profile control agent is prepared from the following components: 0.1-0.3% of polyacrylamide, 0.1-0.3% of a cross-linking agent, 2.0% of NH4Cl, 1.6% of NaNO2, 0.05-0.15% of a catalyst, 0.2-0.5% of a foaming agent, 1-5% of a stabilizing agent and the balance of oilfield reinjection water. The preparation method comprises the steps of dissolving polyacrylamide by using oilfield reinjection water firstly, and secondly adding other components to be uniformly dissolved. The self gas generation foam-gel profile control agent is used for profile control on oilfield reinjection water, and can be also applied to increase production through fracturing, acidification and fuel scavenge; the foam-gel profile control agent is good in salt resistance, the liquid can be prepared by using oilfield reinjection water with high-salinity temperature, the water resource is saved, and the oil-water pollution is reduced; the agent is not cross-linked with being placed at high temperature for a long time, so that construction security is ensured; after the agent is filled into a stratum, foam and gel cross-linking is formed simultaneously, and the foams are uniformly dispersed in the gel with high strength.

The invention relates to gel-foam selective plugging agent and the application thereof, belonging to the technical field of oilfield chemistry. The plugging agent comprises the components: 30-50% of acrylamide, 20-40% of hexamethylenetetramine, 5-15% of phenol, 5-15% of tetraethylene pentamine and 5-15% of foaming agent. The aqueous solution with the mass ratio of 0.5-2% can be prepared in site and is injected into a well after being evenly dissolved, so that the plugging agent is used for plugging water in the oil well at the temperature of 90-150 DEG C. The plugging agent uses organic crosslinker for cross bonding polymer to form gel foam under the condition of high temperature, so as to be resistant to the high temperature of 90-150 DEG C and have long period of validity in plugging water.

The invention relates to a fluorocarbon surfactant binary composite foam flooding system. The system is prepared by adopting fluorocarbon surfactant as a foaming agent, adopting a macromolecular compound as a foam stabilizer and adding water; the foaming agent is one or combination of sulphobetaine type fluorocarbon surfactant and amine oxide type fluorocarbon surfactant, or combination of alpha-alkenyl sulfonate and one of sulphobetaine type fluorocarbon surfactant and amine oxide type fluorocarbon surfactant; and the foam stabilizer is partially hydrolyzed polyacrylamide, polyvinyl pyrrolidone K30, polyvinyl pyrrolidone K90 or hydroxyethyl cellulose. An application method comprises that solution of the fluorocarbon surfactant binary composite foam flooding system and nitrogen are alternately injected into a stratum or a rock center so as to improve the recovery rate of crude oil.

The invention relates to a novel bubbling foam stabilizer and a preparation method thereof. The molecular formula of the novel bubbling foam stabilizer is as shown in a formula (I). The preparation method of the novel bubbling foam stabilizer comprises the following steps: performing a reaction on isododecanol and epoxy ether under the action of a catalyst BF3-aether solution; and then performing a reaction with chlorosulfonic acid and sodium hydroxide to generate the bubbling foam stabilizer. The surfactant bubbling foam stabilizer provided by the invention has the advantages of novel structure and excellent performance. A small amount of the bubbling foam stabilizer can generate a lot of foam, and the half life of foam can reach over 3 times of that of a conventional bubbling agent. A single bubbling foam stabilizer can achieve a compound effect of various bubbling agents, and the adding amount is smaller, thereby providing a novel method for researching a high-performance foam drilling fluid.

The invention discloses a medium-high temperature hard rubber recyclable foam drilling fluid and a preparation method thereof. Add low molecular weight anti-high temperature foam stabilizer to clear water. After dispersing and dissolving, add wetting agent and foam film density reducing agent successively. Stir well and let stand to ensure full swelling to form a temperature resistant hard base liquid. Accurately weigh the sodium bentonite, alkaline regulator, sulfonate polymer fluid loss reducer, foaming agent, temperature-resistant resin fluid loss reducer and foam surface viscosity regulator, mix them evenly, and add the temperature-resistant hard gum base while stirring. medium and high temperature hard rubber can be circulated in micro-foam drilling fluid or completion fluid. The medium and high temperature recyclable foam fluid of the invention has low solid phase content, strong membrane structure and excellent foam stabilization effect, and can resist saturated NaCl and 25% CaCl 2 , to increase the recirculation times of the completion fluid after the micro-foam drilling fluid, so that the recyclable micro-foam drilling and completion fluid can be safely and efficiently used in the exploitation of medium, high temperature and low pressure leaky oil and gas resources and geothermal wells.

The invention discloses a foam well washing fluid and a preparation method thereof. The well flushing fluid includes the following components in weight percent: 0.1% to 0.5% of bactericide, 0.01% to 0.05% of ion stabilizer, 0.1% to 0.3% of foaming agent, 0.1% to 0.3% of thickener, and 0.02% of crosslinking agent %~0.045%, and the balance is oilfield sewage. The foam well-washing fluid prepared by using oilfield sewage in the present invention has excellent foaming performance and foam-stabilizing performance, meets the requirements of on-site construction, not only alleviates the demand for clean water resources in oilfield well-washing operations, but also solves the problem of oilfield produced formation water treatment; At the same time, it has low density, strong sand-carrying performance, good filtration loss reduction effect, and high well washing efficiency, which can reduce formation damage to low-pressure oil and gas wells; has good economic and environmental benefits, and is suitable for popularization in oil field low-pressure oil and gas well washing operations. application.

The invention discloses a medium-high temperature strong plugging hard rubber recyclable foam drilling fluid and a preparation method thereof. Add low molecular weight anti-high temperature foam stabilizer, wetting agent and foam film density reducing agent to water to form temperature resistant hard base liquid. Add sodium bentonite, alkaline regulator, sulfonate polymer fluid loss reducer, foaming agent, temperature resistant resin fluid loss reducer and foam surface viscosity modifier into the temperature resistant hard gum base liquid to form medium and high temperature hard gum Circulating microfoam drilling fluid or completion fluid. Add low-density plugging agent and stir to form medium and high temperature strong plugging hard rubber micro-foam drilling fluid or completion fluid. The medium and high temperature strong plugging recyclable foam fluid of the invention has low solid phase content, strong membrane structure, and excellent foam stabilization effect before and after medium and high temperature; it can improve the circulation times of the completion fluid after the micro-foam drilling fluid and the effect of plugging, and reduce the loss of drilling fluid , so that the recyclable micro-foam drilling and completion fluid can be safely and efficiently applied to the exploitation of medium, high temperature and low pressure oil and gas resources, geothermal wells, etc., which are easy to leak, and meet the needs of deep well drilling.