39results about How to "No solid phase" patented technology

The invention discloses an oil layer protective solution, which is composed of water, a tackifier, a filtrate reducer, an anti-swelling agent, a surfactant, and a bactericide. The protective solution utilizes a synergetic effect of the chemical agents mentioned above so as to realize multiple protective functions on oil layer. The preparation method of the oil layer protective solution comprises the following steps: adding a surfactant and a bactericide into clean water, stirring so as to prepare a basic solution; mixing a tackifier, a filtrate reducer, and an anti-swelling agent according to a ratio so as to make into a uniform solid mixture, then adding the solid mixture into the basic solution with stirring, and stirring to dissolve the mixture so as to form the finished product. The protective solution is used during the process of workover operations such as well killing, well washing, sand washing, pump inspecting, electricity inspecting, electricity to pumping transferring, pumping to electricity transferring, blowing to pumping transferring, blowing to electricity transferring, pump upgrading, and pump depth deepening to protect the oil reservoir so as to prevent the oil reservoir from damages caused by workover fluid.

The invention discloses a liquid capable of being simultaneously compounded with surface water and brine workover fluid and a preparation method thereof. The liquid is prepared from the following components in percentage by mass: 0 to 29% of weighting agent (sodium formate), 3% of antiswelling agent (potassium formate), 2% of chelating agent (ethylenediamine tetraacetic acid tetrasodium salt), andthe balance of fresh water, wherein the density of the liquid is 1.01 to 1.15g / m<3>. The liquid is compounded with the heavy sodium carbonate and calcium chloride surface water, and is also compounded with the workover fluid prepared from sodium chloride, calcium chloride and zinc chloride. The liquid has the advantages that the cost is low, the injury is weak, the pollution is avoided, the solidphase is avoided, the fluidity is good, and the like; the site construction requirements can be met.

The invention is a recycled solidfree micro-foam drilling fluid or a completion fluid, which comprises the following components in parts by weight: 1. 2-3 parts of recycled solidfree micro-foam composite treatment agent SD-LNA; 2. 0.5-1 part of low-density solidfree tackifier SD-LNV; 3 0.5-1 part of low-density modifier SD-LFD; 4. 0.5-1 part of low-density foam stabilizer SD-LFS; 5. 0.5-1 of low-density flow type modifier SD-LFR; and 6. 100 parts of water. According to a normal preparation method, the above substances are added into water successively, mixed and stirred evenly under normal temperature and normal pressure. The invention has the advantages of low density, high viscosity, small low fluid loss, good lubricating property, strong landwaste suspension property, easy maintenance, fine cleaning capability of wells, fine inhibitory capability on clay and shale, no micro-foam convergence, recycled use and the like, can be widely applied in engineering such as petroleum, geologic drilling and the like, is particularly applicable to construction technology of well drilling and well completion of low-pressure reservoir and exhausted reservoir.