34results about How to "Safe drilling" patented technology

The invention relates to an automatic control system and method for underground annulus pressure of deep water surface layer drilling. The system comprises three pipelines which are respectively arranged in a heavy slurry pond, a seawater pond and a treating agent pond, wherein each pipeline is connected with the input end of a mixer, the output end of the mixer is connected with an outflow pipeline, and the outflow pipeline is connected with a pup joint of a seabed underground PWD. Each pipeline is internally provided with a power pump, a regulating valve and an inlet flow meter, and the outflow pipeline is internally provided with an outlet flow meter. The underground PWD is connected with an MWD, a signal receiving device of the MWD is in communication connection with a remote computer control system, the remote computer control system is connected with a logging system and a PLC (Programmable Logic Controller) control system through a data bus, and the PLC control system is connected with the regulating valve, the inlet flow meter, the mixer and the outlet flow meter through data. According to the invention, a secondary microcomputer control system is created through the remote computer control system and the PLC control system, so that the mixing proportion of heavy slurry and seawater is automatically regulated, and drilling slurry with required density and flow is input to the underground to carry out underground pressure balance regulation to further realize safe drilling.

The invention relates to a solidified plugging agent in the field of oil drilling plugging, a preparation method thereof, and a plugging slurry; the cured plugging agent includes the following components in parts by weight: 100 parts of curing agent, 0.4 to 0.4 parts of activator 1.2 parts, 0.2-1 parts of viscosity reducer, 0.5-1.5 parts of dispersant, 4-10 parts of suspending agent, 1-5 parts of fiber crosslinking agent; the temperature resistance of the plugging slurry prepared by the solidified plugging agent is greater than 120°C , the pressure bearing capacity of the plugging slurry after curing is greater than 10 MPa, it can accommodate 20% of asphalt heavy oil, and the strength after curing is greater than 3.0 MPa. The cured plugging slurry of the present invention has good compatibility with asphalt, and can effectively block the asphalt loss layer. Reduce the occurrence of complicated situations; with the deepening of petroleum exploration and development, drilling encounters more and more complex geological environments. The solidified lost circulation slurry of the present invention can seal lost circulation layers in complex geological environments of asphalt layers to ensure drilling safety. Drill faster.

The invention discloses a three-channel pressure control system and control method at the bottom of a deep-sea double-layer tube well, including double-layer tubes, casings, drill bits, conversion joints, outer sleeves, axial flow pumps, turbine motors, liquid level monitoring sensors, and valve groups Control unit, double-layer pipe return manifold, drilling fluid pumping manifold, drilling pump, drilling fluid circulation tank; the conversion joint is connected to the lower end of the double-layer pipe, and the outer sleeve is sleeved on the upper On the half part, the axial flow pump and the outer sleeve are respectively connected to the lower end and middle part of the conversion joint, the axial flow pump, the turbine motor, and the drill bit are connected in sequence, the double-layer pipe is placed in the casing, and the inner The pipe, outer pipe and casing are concentric strings. The double-layer pipe of the present invention forms three drilling fluid channels, and by changing the lifting performance of the axial flow pump, the self-adaptive control of the bottom hole pressure is realized, and the dynamic balance of the bottom drilling fluid column pressure is effectively maintained.

The invention discloses a polyacrylamide strong gel for well control and a preparation method thereof. The polyacrylamide strong gel for well control consists of the following components in percentage by weight: a base solution comprising 1-6% of polyacrylamide, 2-8% of a structure reinforcing agent, 0.4-8% of an anti-dehydrating agent, 0.2-4% of an antioxidant and the balance of water according to the total solution mass of the prepared polyacrylamide strong gel for well control, and 0.2-10% of a crosslinking agent relative to the mass fraction of the base solution. The polyacrylamide strong gel prepared by the preparation method has the characteristics of high strength, good elasticity, good toughness, good adhesion, high compression strength, good gas tightness and the like, can be directly gelatinized and used in an N80 tube special for an oil field, can be adhered to a sleeve, and can effectively prevent gas from escaping out of a pit shaft to achieve good effects of well control and sealing.

The invention discloses an open hole easy-drilled bridge plug which comprises an open hole easy-drilled bridge plug body and a releasing tool. The releasing tool comprises an upper connector, a connection pipe, a center pipe, a piston, a lower piston, a cylinder sleeve and a spring claw. The open hole easy-drilled bridge plug body comprises a body center pipe, a rubber sleeve capable of expanding when meeting hydrocarbon and water and a lower connector. By means of the open hole easy-drilled bridge plug body adopting the rubber capable of expanding when meeting hydrocarbon and water and the releasing tool, drillable bridge plug blocking of an open hole is achieved. The plug is used for mechanical blocking of the open hole or blocking removing tubular columns, is capable of conducting two-way sealing and can be removed in a drilling mode safely and quickly.

The invention discloses an emulsion drilling fluid with high density and low oil-water ratio for a shale horizontal well. The emulsion drilling fluid is prepared from raw materials in parts by weight as follows: 180 parts of 3# white oil, 120 parts of a 30% calcium chloride solution, 2-5 parts of a main emulsifier, 4-8 parts of an auxiliary emulsifier, 12-18 parts of a reversible emulsifier, 5-10 parts of calcium oxide, 2-5 parts of organic soil, 3-8 parts of a blocking agent, 0.5-3 parts of an extracting agent, 6-12 parts of calcium carbonate and 0-800 parts of barytes, wherein the main emulsifier is prepared from tall oil fatty acid and maleic anhydride, the auxiliary emulsifier is prepared from high-level fatty acid salt and high-level fatty acid polyol ester, the reversible emulsifier is prepared from methyl 9-octadecenoate and hydroxyethyl ethylenediamine, and the extracting agent is prepared from styrene, methyl methacrylate and hexadecyl acrylate. The oil-water ratio is 6:4, and the emulsion drilling fluid has higher inhibition dispersibility and blocking capacity, good lubricating property and good heat-resisting property and can be suitable for meeting the drilling requirement of a horizontal section of the shale deep well.

The invention belongs to the field of petroleum engineering deep-water drilling, and in particular relates to a submarine wellhead pressure indication and automatic adjustment device for deep-water double-gradient drilling. The subsea wellhead pressure indication and automatic adjustment device for deepwater dual-gradient drilling includes: subsea drilling fluid manifold system and subsea wellhead pressure indication and automatic adjustment system; Return to the drilling platform smoothly, and at the same time provide the foundation for the subsea wellhead pressure indication and automatic adjustment system; seawater hydrostatic pressure. The invention can automatically and in real time keep the seabed wellhead pressure equal to the seawater hydrostatic pressure at the seabed in the process of double-gradient drilling in deep water, thereby ensuring the smooth implementation of the double-gradient drilling.

The invention discloses a nano-composite blocking agent for shale horizontal well drilling, and belongs to the technical field of petroleum drilling. The nano-composite blocking agent is prepared fromthe following raw materials in parts by weight: 20 to 30 parts of nano-emulsion, 3 to 8 parts of nanosilicon dioxide, 10 to 20 parts of polyethylene glycol, and 20 to 30 parts of polymeric alcohol, wherein the nano-emulsion is prepared by mixing solid paraffin, white oil, an emulgator and water according to a weight ratio being 2:2:1:5, and stirring for 1h under the conditions of the temperaturebeing 80 DEG C and the stirring speed being 120rpm; a hydrophilic-lipophilic balance value of the emulgator is 10.3. The nano-composite blocking agent has the particle size being smaller than 500nm, is not aggregated or agglomerated, has a certain cloud point and good blocking performance and inhibitive ability, can effectively stabilize a well wall, ensures safe drilling of a shale horizontal well when a water-based drilling fluid is used, has good temperature resistance and stable product performance, and can be applicable to the drilling demand of a long horizontal section of the shale horizontal well.

The invention discloses a drilling bit of an ice drill for drilling warm ice layer. The drilling bit comprises a drilling bit body, special-shaped cutting tools and pad shoes, wherein the bottom of the drilling bit body is provided with a plurality of water troughs, a channel is formed between the inner cavity and the outer wall of the drilling bit body due to the water troughs, the plurality of special-shaped cutting tools and the pad shoes are fixed on the bottom lip surface of the drilling bit body parallelly, and the bottom of the pad shoes is provided with a plurality of micro-nano bulgesor pits. The drilling bit has the beneficial effect of reducing friction heat of the bottom of the drilling bit. The drilling bit of the ice drill can lower cutting heat, is good for coolinga drilling liquid and carrying flake ice, can effectively prevent a large quantity of flake ice from bonding and gathering, and can drill warm ice layer of the glacier safely and rapidly.

The invention provides a biomass lubricant for drilling fluid, which is prepared from raw materials comprising the following components: 15 to 30 parts by weight of biomass base oil; 3 to 5 parts by weight of ionic liquid antiwear agent; 2 to 5 parts by weight of an emulsifier; 0.5 to 1 part by weight of an antifoaming agent; 0.05 to 0.1 parts by weight of a tackifier; 58 to 80 parts by weight of water; the biomass base oil is made of natural fat It is prepared from the front fraction of alcohol, organic acid and lipase catalyst; the viscosity raising agent is high viscosity sodium carboxymethyl cellulose. Compared with the prior art, the biomass lubricant for drilling fluid provided by the present invention adopts specific content of components to achieve better interaction, and the product has strong lubrication, high temperature resistance, environmental protection and non-toxic characteristics, and good compatibility ; Suitable for special drilling operations such as extended reach wells, deviated wells and horizontal wells, especially for oil and gas wells with deep buried reservoirs and high temperature and high pressure.

The invention relates to an automation device for storage of an oil drilling string. The automation device is mainly used for solving the problems of great labor intensity and poor safety due to manual operation of the existing aboveground drilling string during racking construction. The automation device is characterized in that the device comprises a drilling string storage unit, a mounting base unit and a support unit, wherein the drilling string storage unit is formed by connecting two parts, namely a storage frame body and a pipe pulling mechanism; a No. 1 guide wheel and a No. 2 guide wheel in the pipe pulling mechanism are in sliding fit and connection with H-shaped steel of a guide track in the storage frame body; a bearing seat of the drilling string storage unit and a rotating support seat of the base mounting unit are connected through a rotating shaft so as to enable the drilling string storage unit to complete clockwise and counterclockwise rotation through a hydraulic cylinder under the action of a manual hydraulic pump; a frame body articulated support saddle and a base articulated support saddle are connected through a positioning pin, thereby realizing the stability of the device; and the drilling string storage unit is in hinge fit with the mounting base unit, and the drilling string storage unit is in threaded connection with the support unit. The device can realize the mechanical automation of the tripping and drilling string racking work of well repair operation.