41results about How to "Good reservoir protection performance" patented technology

The invention relates to a reservoir protection agent composition. The composition comprises non-fluorescent sulfonated asphalt, micron-sized cellulose and a reservoir protection agent, wherein the reservoir protection agent comprises structural units represented by the following formulas (1), (2) and (3) as shown in the description. The invention also provides a broad-spectrum-type drilling fluid containing the reservoir protection agent composition. The invention also provides an application of the broad-spectrum-type drilling fluid in oil and gas drilling. When applied in the oil and gas drilling of multiple reservoir structures, the broad-spectrum-type drilling fluid can exhibit better rheological property, temperature resistance, anti-collapse property and protective property.

The invention relates to an oil-based drilling fluid for development drilling of a shale gas, and belongs to the technical field of drilling fluids for petroleum drilling engineering. The oil-based drilling fluid is characterized by being prepared from the following components by weight percent: 0.2% to 2% of main emulsifier, 0.1% to 1% of auxiliary emulsifier, 0% to 1.5% of wetting agent, 0.2% to 1.5% of alkalinity regulating agent, 0% to 1.5% of organic soil, 0% to 1.5% of tackifier, 0.2% to 2% of filtrate reducer, 0% to 80% of weighting agent, 0% to 20% of water phase and the balance of oil phase. The oil-based drilling fluid can be used for meeting a special requirement of the shale gas drilling to the drilling fluid, and is good in stability, inhibitory capability and lubricity even under low and high temperatures. The oil-based drilling fluid has the characteristics of high dynamic plastic ratio, low plastic viscosity, wide application range and good economic benefit.

The invention relates to the technical field of petroleum drilling, and discloses a nanofilm structure reservoir protection agent and preparation method thereof and drilling fluid and application of the nanofilm structure reservoir protection agent or drilling fluid in low permeability reservoir drilling. The nanofilm structure reservoir protection agent comprises a montmorillonite lamella, a structure unit shown in formula (1) as shown in the description and a structure unit shown in formula (2) as shown in the description, wherein R1, R2, R3, R4 and R5 are respectively and independently hydrogen, CD-C4 alkyl or C1-C4 alkoxy, and R6 is C1-C6 alkylene. The invention further provides the drilling fluid containing the nanofilm structure reservoir protection agent disclosed by the invention. The drilling fluid containing the nanofilm structure reservoir protection agent shows good rheological property, anti-temperature property, anti-collapsing property and reservoir protection property when being applied for the low permeability reservoir drilling.

The invention relates to a substituted saccharide or a substituted glucoside and application of the substituted saccharide or the substituted glucoside in a drilling fluid composition. The substitutedsaccharide or the substituted glucoside has a substituent group A, a substituent group B and a substituent group C, wherein the substituent group A structurally contains a first group, the substituent group B structurally contains a second group, and the substituent group C structurally contains a unit -NH-R7-. Definitions of the groups are as shown in the specification. The drilling fluid composition can show good temperature resistance, filtration reduction performance, antipollution performance, inhibition performance, lubrication performance or reservoir protection performance, and does not have biotoxicity.

The invention provides a self-plugging releasing temperature resistant temporary plugging agent used for water-based drilling fluid, the self-plugging releasing temperature resistant temporary plugging agent comprises nano calcium carbonate and a product which is obtained by reacting starch, alkali metal hydroxide, halogenated organic acid, carbonate, a hydrophobic modification agent and alcohol with water. The invention also provides a preparation method of the self-plugging releasing temperature resistant temporary plugging agent used for the water-based drilling fluid, and the self-plugging releasing temperature resistant temporary plugging agent used for the water-based drilling fluid can be obtained by proportionally adding components into a kneading machine for kneading. The self-plugging releasing temperature resistant temporary plugging agent has strong high temperature resistance, and can resist the temperature up to 140 DEG C; and the self-plugging releasing temperature resistant temporary plugging agent has good temporary plugging effect and significant reservoir protection effect, and the water-based drilling fluid added with the temporary plugging agent has high temporary plugging rate and oil phase permeability recovery rate; at the same time, the temporary plugging agent has self-plugging releasing ability. During the late flowback, the self-plugging releasing can be realized by formation of a hydrophobic channel without acid washing for mud cake removal and other processes, and secondary damage to a reservoir can be avoided.

The invention relates to the field of drilling fluid, in particular to a saturated salt water drilling fluid of salt response type intelligent polymer and preparation method thereof. The drilling fluid contains two or more of the following components stored in admixture or separately: bentonite, NaOH, KCl, calcium carbonate, barite, NaCl, supramolecular fluid loss additive, supramolecular shear-enhancing agent, plugging agent, coating agent and water. The drilling fluid provided by the invention has the characteristics of salt response and self-assembly, can keep rheological properties such as rapid recovery of the sheared structure, low extreme high shear rate viscosity, good shear dilution property and the like in a high-salt environment, has good fluid loss reduction performance, reservoir protection performance and debris dispersion inhibition performance, and has good temperature resistance and pollution resistance performance.

The present invention relates to underbalanced Well Operations and Production Operations In the technical field, it is a method for joint operation of underbalanced well completion downhole tubing and gas lift production, which is carried out as follows: the first step is to fixedly install the blowout preventer in the tubing and the Basket, fixedly install the valve fixing seat in the blowout prevention device in the tubing, install the valve in the valve fixing seat, and install no less than one reverse gas lift valve in the middle of the tubing string, and fix the upper end of the casing on the wellhead . The invention fixedly installs the blowout preventer in the tubing at the bottom of the tubing string, not only can successfully complete the tubing operation in the well completion stage, but also can establish a gas-lift drainage or production channel during the gas-lift production process, so that the gas-lift production The operation is carried out smoothly, the operation cycle is shortened, and the underbalanced The reservoir protection effect of drilling, oil and gas wells can be put into production in time, and maintain a good productivity improvement effect, thereby improving the competitiveness of underbalanced technologies 。

The invention relates to a nano-sealing agent for water-based drilling fluid, a preparation method thereof and drilling fluid. The nano-sealing agent for water-based drilling fluid is polystyrene sulfonate sodium covalently coated multi-walled carbon nanotubes, wherein the multi-walled carbon nanotubes have a diameter of 20-30 nm and a tube length of 10-30 μm; The number-average molecular weight of the sodium polystyrene sulfonate of described grafting is 75kDa, and degree of polymerization (DOP) is 900; Described drilling fluid contains the water of 100 weight parts, and bentonite is 1-8 weight parts, and flow regulator is 4-10 parts by weight, 0.2-1.2 parts by weight of viscosifier, 4-10 parts by weight of fluid loss control agent, 30-60 parts by weight of plugging agent, 10-50 parts by weight of weighting agent, and 0.1 parts by weight of lubricant -4 parts by weight, the content of the pH regulator is 0.1-0.4 parts by weight. The present invention uses sodium polystyrene sulfonate modified multi-walled carbon nanotubes as the plugging agent, which can effectively plug micro- and nano-sized pores on the well wall of mud shale, and is especially suitable for low-space and low-permeability, development of micro-pores and micro-cracks, and capillary Drilling operations in formations with outstanding effects.