31results about How to "Reduce well completion costs" patented technology

Provided are a tool and a method for injecting cement into the top of a horizontal well screen pipe without drilling and plugging. The tool for injecting the cement into the top of the horizontal well screen pipe without drilling and plugging is composed of a drilling-free and plugging-free tool, a bumping pressing rubber plug and a fishing tool. During construction, the drilling-free tool is lowered to the well along with a sleeve bunch. A well mouth is pressurized, a packer is sealed through expansion, pressurization is continued, a starting piston is opened, circulation is built, and well cementation is conducted normally. The bumping pressing rubber plug is added for bumping pressing at the later stage of the well cementation, the piston is closed simultaneously, a circulation channel is closed, and the well cementation is finished. After cement curing is finished, fishing is conducted through a small drill pipe connected with a fishing anchor, the small drill pipe and the fishing anchor are lifted after being in place, slips are opened, a fishing drum is blocked, an internal structure of the drilling-free tool is lifted together, and construction is finished. During a working process, a well completion accessory used in the process is not affected by drilling and grinding, service life is greatly prolonged, diameter in a well completion pipe column is large, the inner surface of the well completion pipe column is smooth, and smooth implementation of acid washing and gravel packing is guaranteed. Well completion working time of a single well is reduced by 24 hours on average, and well completion cost is greatly saved.

The present invention relates to a horizontal injection-production well completion structure with flow control function. The horizontal injection-production well completion structure comprises a well wall and a flow control filter. The well wall consists of a rising section and a horizontal section. The flow control filter is arranged in the horizontal section of the well wall and is fixedly connected with the well wall. A cavity between the flow control filter and the well wall is filled with glass hollow particles. The horizontal injection-production well completion structure with the flow control function of the present invention has the characteristics of being easy for realizing, low well completion cost and strong function for axial anti-fluid-channeling.

The invention relates to a cement-free well cementation method for a horizontal section of a horizontal well. The cement-free well cementation method the step of constructing a well completion system structural pipe string of a horizontal section sleeve fixing tool; delivering the constructed pipe string to the bottom of an oil-gas well, performing mud circulation, starting the sleeve fixing tool, effectively fixing a sleeve and the well wall, and establishing internal circulation of the well; throwing balls into the well, building and testing the pressure, increasing and stabilizing the pressure until a packer inflatable channel in a non-drilling plug tool is open, and inflating and sealing the packer; increasing and stabilizing the pressure until the packer inflatable channel is closed; increasing the pressure until a cement injection channel is opened; delivering a well cementation rubber plug to a close seat of the non-drilling plug tool, and closing the cement injection channel; and salvaging the inner cylinder of the non-drilling plug tool, matching accessories and the well cementation rubber plug to complete the whole construction process. By using the method, the construction process can be simplified, the working cycle can be shortened, and the well completion cost is reduced.

The invention discloses a method for developing a low-permeability gas reservoir, which comprises the following steps: positioning a drilling ship on a sea for well drilling and well completion, establishing a synthetic natural gas migration channel between a production gas reservoir sand body of a developed gas field and a selected to-be-developed low-permeability gas reservoir and combining with a fracturing technology; utilizing the production gas reservoir sand body as a transporting layer and fully utilizing a production platform of the developed gas field or the existing well network of the production gas reservoir of an underwater production system to realize the development of the developed gas field on the sea or the low-permeability gas reservoir on the periphery of the developed gas field so as to reduce the well drilling quantity and the well completion period and reduce the well drilling and well completion expenses. The method has the benefits that well drilling and well completion operation procedures and a well completion tube string structure are simplified, the operation difficulty and the workload are reduced, and the cost is greatly reduced; and by adopting the method, a residual well slot or a residual underwater wellhead is not required, a well slot or a underwater wellhead is not required to be additionally arranged, and a production platform or a underwater production system is not required to be newly built, so that the development investment is greatly reduced, and the economic benefit is greatly improved.

The invention provides a fracturing and sand prevention pipe column and a fracturing and sand prevention method. The fracturing and sand prevention pipe column comprises a casing pipe and an oil pipearranged in the casing pipe, an annular space is formed between the casing pipe and the oil pipe, a fracturing packer is arranged on the oil pipe, a ball seat and a sand prevention sieve pipe are arranged in the bottom end of the oil pipe in a sleeved mode, the ball seat is in threaded connection with the upper part of the sand prevention sieve pipe, the bottom end of the oil pipe is connected with a limiting device, the limiting device is located on the lower part of the sand prevention sieve pipe, and the length of the sand prevention sieve pipe is greater than the thickness of a reservoir by 20 to 30 meters; a female buckle is arranged at the top end of the sand prevention sieve pipe, and a limiting groove is formed in the limiting device; when a soluble ball is put to strike the ball seat, the ball seat drives the sand prevention sieve pipe to move downwards until the female buckle is clamped in the limiting groove; and after the sand prevention sieve pipe is in place, still standing is conducted for 48 hours, and the soluble ball is dissolved. According to the fracturing and sand prevention pipe column, under the situation of not conducting secondary well completion, it can beensured that stratum sand and fracturing sand do not flow back from a stratum, and fracturing and sand prevention is integrated.

The invention relates to the field of exploiting of coalbed methane, in particular to an exploiting device and method for a horizontal well of coalbed methane. The device comprises a sifting pipe, a casing pipe and a connecting assembly; the sifting pipe is put into the position of the horizontal well of a coalbed; the casing pipe is connected with the sifting pipe, and put into the position of aplumb shaft section; the connecting assembly is connected with the sifting pipe and the casing pipe, and comprises a packing device and salvageable interior accessories, the packing device is connected with a shell, and the shell is connected with the casing pipe through a connecting device; the packing device is used for abutting against the well wall after expanding. According to the device andmethod, during well completion, the sifting pipe is put into the horizontal well of the coalbed, the coalbed methane is collected through the sifting pipe, and the casing pipe is put into the interference stratum above the coalbed; meanwhile, the casing pipe and the annulus band of the well wall are sealed in a well cementation mode, so that the situation that development of the coalbed methane isinterfered by the interference stratum; meanwhile, normal well completion of the plumb shaft section can be achieved, lossless work of the coalbed of the horizontal section can also be guaranteed, and the requirement for efficient development of the coalbed methane is completely met.

The invention discloses a development method of an offshore small-scale gas reservoir. The method is characterized by comprising the following steps of: (A) selecting a developed gas field production gas reservoir, and selecting a small-scale gas reservoir to be developed, which is suitable to be developed by adopting the method, in the gas field or around the gas field; (B) selecting a proper offshore position for a drilling ship for taking the place, and establishing an artificial natural gas migration channel between a gas reservoir sand body of the developed gas field production gas reservoir and a small-scale gas reservoir through well drilling and well completion so as to develop the small-scale gas reservoir; and (C) developing the gas reservoir by utilizing a production platform of the developed gas field production gas reservoir or an underwater production system, wherein natural gas in the small-scale gas reservoir enters the gas reservoir sand body of the developed gas field production gas reservoir through the artificial natural gas migration channel under the action of pressure difference, flows to a production well of the production platform or the underwater production system by taking the gas reservoir sand body as a conduction layer and finally flows out of the production well of the production platform or the underwater production system so as to realize the development to the small-scale gas reservoir. According to the development method, through establishing the artificial natural gas migration channel, the traditional development platform or the underwater production system is sufficiently utilized so as to shorten the development period and reduce the investment cost.

The invention relates to the technical field of cementing tools, and provides a drill-free ball seat. The drill-free ball seat comprises a ball seat body, a pawl sleeve, a shear pin and a lower joint; the outer side of the lower portion of the ball seat body and the inner side of the upper portion of the lower joint are fixedly mounted together; the pawl sleeve comprises a claw flap section and an annular section sequentially distributed from top to bottom; the claw flap section is separated by a longitudinal groove distributed along the circumference to form at least two pawl flaps; the bottom end of each of the pawl flaps and the top surface of the annular section at the corresponding position are fixed together; the outer side of the upper end of each of the pawl flaps is fixedly provided with a limit protruding block. The drill-free ball seat is reasonable and compact in structure, and can achieve sealing through a sealing ball, and can also restore the normal diameter by pressing to ensure the normal and continuous operation of follow-up operations. The whole process does not require drilling and milling operations, can reduce the wear on sleeve tube inner walls, and is time-saving, effort-saving, convenient and quick; the construction efficiency can be effectively improved, the cost of well completing is reduced, and the security risks caused by the multi-process are reduced.

The invention relates to the technical field of structures of soluble bridge plugs, in particular to a soluble bridge plug suitable for high-temperature well conditions. The soluble bridge plug is used for solving the problem of pressure bearing of soluble bridge plugs under high-temperature conditions and comprises a central tube, wherein a spacer ring is arranged at one end of the central tube, an anti-collision ring is arranged at the other end of the central tube, an upper slip, an upper cone, an upper female expansion ring, an upper male expansion ring, an upper rubber sleeve seat, a rubber sleeve, a lower rubber sleeve seat, a lower male expansion ring, a lower female expansion ring, a lower cone and a lower slip are sequentially arranged on the portion, between the spacer ring and the anti-collision ring, of the central tube in a sleeving manner, the upper slip and the lower slip are both of an integral cylindrical slip structure, stress cracks are machined in the inner surface and the outer surface of the upper slip and the inner surface and the outer surface of the lower slip, slip teeth are arranged on the slips, the central tube, the spacer ring, the anti-collision ring, the upper slip, the upper cone, the upper female expansion ring, the upper male expansion ring, the upper rubber sleeve seat, the lower rubber sleeve seat, the lower male expansion ring, the lower female expansion ring, the lower cone and the lower slip are all made of soluble metal, the rubber sleeve is made of soluble rubber, and the slip teeth are made of ceramic. The bridge plug is suitable for high-temperature environment mining.