37results about How to "Improve flowback capacity" patented technology

The invention belongs to the technical field of deep treatment of an oil layer, and particularly relates to a method for deep treatment of an oil layer through self-generation foam acidification. The method comprises the following step of injecting a sodium nitrite solution, a sealing liquid and an ammonium chloride solution into an oil well mineshaft in sequence after an oil well is subjected to a self-generation foam acidification treatment of self-generation hydrofluoric acid solution. According to the method disclosed by the invention, residual reacted acid which is regularly acidified is utilized for reacting with the sodium nitrite solution and the ammonium chloride solution to generate foams in a short time. Bu utilizing the characteristics of high viscosity and strong carrying capability of the foams, the flow-back capability of the reacted acid is increased, particles and secondary precipitation generated by acidification are taken out of the mineshaft, and heat can be simultaneously generated to remove organic block in stratum and increase the measure effect. Meanwhile, the use of dedicated equipment is omitted.

The invention discloses a modifying agent for preventing calcium halide scaling. The modifying agent is prepared from, by mass, 15-25 parts of amino trimethylene phosphonic acid, 4-8 parts of docusate sodium, 2-3 parts of cetyltrimethylammonium chloride, 0.1-0.3 part of tributyl phosphate and the balance water. The modifying agent has the advantages of being high in scaling resistance, small in use amount, easy to construct, not capable of increasing operation workloads, high in flow-back capacity, capable of saving cost, and the like.

The invention relates to the technical field of oil formation hydraulic fracturing and in particular relates to a method for improving performance of a fracturing fluid. The method provided by the invention comprises the steps of adding a compound organic base into a base solution of the fracturing fluid and mixing to be uniform until pH value of the mixed liquor to be 10-12, wherein the compound organic base comprises the following components in percentage by weight: 8-12% of sodium hydroxide, 0.4-0.6% of triethanolamine, 0.15-0.25% of tetramethylammonium hydroxide and the balance of water. By adopting the method provided by the invention, after the compound organic base is added, usage amount of guanidine gum during preparation of the cracking fluid can be reduced, and residue content is low, a friction coefficient is low and flowback rate is high, so that comprehensive performance of the cracking fluid is obviously improved.

The invention provides a formulated fracturing fluid of micro emulsion gel and a proportion thereof, the formulated fracturing fluid of micro emulsion gel comprises the following components by weight percent: 3.8 to 16.7 percent of micro emulsion system, 0.1 to 0.5 percent of polymer, 0.25 to 1.20 percent of cross linking agent, 0.05 to 0.60 percent of gel breaker, 0.05 to 0.10 percent of heat stabilizer and 80.90 to 95.75 percent of water, wherein the micro emulsion system consists of kerosene, compound surfactant, low-molecule alcohol and water, and the polymer is guar gum. By utilizing thesynergistic effect of the micro emulsion and gel, the formulated fracturing fluid of micro emulsion gel is characterized by low content of polymer, high viscosity, low filtration, low content of polymer residual in solution after gel breaking, micro emulsion status of the system after gel breaking, lower surface tension, good suspending power and the like, can greatly reduce flow-back pressure and damage to reservoir, and improve the fracture flow capacity and crude output.

The invention discloses a low-corrosion chemical themogenic pressurizing gel breaker which comprises an agent A solution, an agent B solution and an activator solution. The invention further discloses a preparation method of the gel breaker. The preparation method comprises the following step: uniformly mixing the agent A solution, the agent B solution and the activator solution in volume ratio of 1.0 to (1.0-1.3) to (1.0-1.2). The formation temperature is improved by the heat generated by virtue of gel breaker reaction, and the gel breaker is activated, so that a fracturing fluid is thoroughly broken. Gas generated by the gel breaking has the effect of increasing the formation pressure, so that the fracturing flowback capacity is improved. In addition, by using H3PW12O40 heteropolyacid as the activator of a system, on the basis of not affecting the acid strength, the corrosivity of the system is reduced, and the destructiveness on a soil environment in the fracturing process is effectively reduced.

The invention relates to a high performance cleanup additive for oil and gas well and method for making which comprises the steps of, heating host crystal anion (25%-35%) and non-ionic surface active agent (35%-45%) to 50-90 deg. C for mixing and reaction 3h, dissolving the anionic surface active agent with alcohols and charging into host agent, stirring, mixing uniformly and charging other auxiliary agent (5-10%), stirring again and mixing homogeneously.

The invention provides a petroleum drilling system for inside-input and inside-output type drilling fluid. The petroleum drilling system comprises a drilling derrick, a drilling fluid inlet tank, a drilling fluid pressurization pump, a drilling fluid recovery pump, a drilling fluid recovery tank, a wellhead blowout preventer, a drill rod assembly, a stratum sealing drum and a drill bit, wherein the drill rod assembly comprises a plurality of drill rod units which are sequentially connected; a drill rod clapboard is arranged inside each drill rod unit; the front and rear side edges of each drill rod clapboard are in sealed contact with the inner wall of each drill rod unit; each drill rod clapboard is fixed in each drill rod unit through a clapboard fixing assembly; the drill rod clapboardsarranged in different drill rod units are connected through clapboard connecting assemblies; and the interior of the drill rod assembly is divided into a left drilling fluid output channel and a right drilling fluid input channel by the drill rod clapboards. The petroleum drilling system provided by the invention has the advantages that under the action of the drilling fluid recovery pump and thedrilling fluid pressurization pump, the input and output of the drilling fluid can be completed inside the drill rod assembly so as to avoid massive loss of the drilling fluid, and simultaneously, the drilling fluid is circularly utilized so as to lower the drilling cost.

The invention discloses a solid-free slurry-replacing well completion protective fluid and a preparation method thereof, which belongs to the technical field of exploitation of oil and gas fields. The completion protective fluid comprises, by weight, 100 parts of a formate-based liquid, 0.2 to 0.4 part of a thickening agent, 1 to 3 parts of a high temperature high temperature, 0.2 to 3 parts of a clay stabilizing agent and 0.2 to 1 part of a waterproof locking agent. The completion protective fluid has the following advantages: (1) the completion protective fluid has no solid phase, so solid phase settlement does not exist; (2) the completion protective fluid has good rheological properties and a low shearing force value; (3) the completion protective fluid has an excellent hydrocarbon reservoir protection function; (4) the completion protective fluid has good high temperature resistance and salt resistance stability, and a system has good displacement and carrying capability under reservoir temperature; (5) the completion protective fluid is safe, nontoxic, easily degradable and compatible with the environment; (6) the completion protective fluid has good compatibility with a drilling fluid and a fracturing fluid, and the rheological properties of the completion protective fluid are not influenced after mixing; (7) the completion protective fluid has little corrosivity and greatly reduces corrosivity of a saline solution to downhole tools; and (8) the completion protective fluid has great specific gravity and no solid phase and is applicable to areas with abnormal high temperature and high-pressure area.

The invention provides a high-temperature microemulsion cleanup additive used for fracturing, and a preparation method thereof. The preparation method comprises the following steps: 1, adding 10-20 parts by mass of water into a reactor, adding 40-60 parts by mass of a cosurfactant to water, and stirring the cosurfactant and water at room temperature until the cosurfactant is completely dissolved; and 2, sequentially adding 20-40 parts by mass of a gemini surfactant and 3-4 parts by mass of a nonionic surfactant into the reactor, supplementing water to the reactor until the mass part number of a mixture obtained in the reactor is 100, and uniformly stirring the mixture at room temperature to obtain the high-temperature microemulsion cleanup additive. The high-temperature microemulsion cleanup additive is directly added to a fracturing fluid or an acidifying liquid according to a mass ratio of 0.1-0.3:100 when used.

The invention relates to the technical field of chemical additives for oilfield fracturing and acidification, in particular to a foaming flowback agent for oilfield fracturing and its application. The foaming flowback agent is composed of A agent and B agent, and the A agent It includes sodium nitrite and fast penetrating agent T, and the B agent includes ammonium chloride, persulfate and surfactant; the foaming flowback agent can be used for deblocking and flowback of oil wells with water content not exceeding 50%. The foaming flowback agent can not only reduce the formation of fracturing fluid filter cake, but also remove wax, colloid, and asphaltenes, increase flowback capacity, stabilize formation clay, reduce oil-water surface interfacial tension, and improve fracturing performance. Effect.