31results about How to "Avoid interlayer interference" patented technology

The invention discloses a downhole intelligent controlling type expansion packer. The downhole intelligent controlling type expansion packer comprises an upper joint and a lower joint; an intelligent controlling plate (15) is fixedly connected to the upper joint; an inner cavity pressure gauge (47), a sealing pressure gauge (54) and an in-pipe pressure gauge (55) which are connected with the intelligent controlling plate (15) are arranged on one side of a sealing main body (33); an electric switch is arranged in the sealing main body (33) and controls liquid inlet and liquid outlet of an inner cavity of a rubber barrel, steel pipe cables penetrate through a packer body, and locking and sealing mechanisms are arranged on the two extended ends of the steel pipe cables. According to the downhole intelligent controlling type expansion packer, the self power supply and data transmission problems are solved by utilizing the penetrating cables, a ground controlling system can control the packer to be set and unset and collect and upload data of the inner cavity, stratum and in-pipe pressure in time, the examining seal procedure of the packer is simplified, the accuracy of other downhole parameter admission is improved, fluid migration preventing pressure difference between layers during stopping injection is raised to over 15MPa, interlayer interference in an oil producing well is solved, and occurrence of downhole accidents is reduced.

The invention relates to an external packer of a high temperature pipe, comprising a coupling, a casing nipple, a central pipe and an upper joint; one end of the casing nipple and one end of the central pipe are fixedly connected or spin-connected by threads; the other end of the casing nipple and the coupling are fixedly connected or spin-connected by threads; the casing nipple, the upper joint sleeve and the central pipe are connected by threads; the external packer also comprises a high-temperature rubber barrel component and a bidirectional locking device; the high-temperature rubber barrel component and the bidirectional locking device are sleeved on the external surface of the central pipe; one end of the high-temperature rubber barrel component is contacted with the upper joint andthe other end thereof is contacted with the bidirectional locking device. The external packer can divide longer horizontal well section of a thick oil horizontal well into a plurality of small sections mutually independent for independent operation, solves the problem that the employed well sections are not even; and simultaneously the inner through diameters of the external packer of the high temperature pipe and a screening pipe are consistent, thus being capable of leading a steam injection pipe column and other pipe columns to be down smoothly.

The invention relates to a vertical-well double-layer partial-pressure commingling method and device for coalbed methane. The method includes the steps that a pipe is arranged in the well, and three isolated channels including the first channel, the second channel and the third channel are arranged in the pipe; the side wall of the first channel and the side wall of the second channel are communicated with two coal beds respectively, gas of the two coal beds is discharged to a well opening through the first channel and the second channel respectively, liquid of the two coal beds flows to the bottom of the first channel and the bottom of the second channel respectively, and gas-liquid separation is achieved in the well; one-way valves are arranged between the first channel and the second channel and between the second channel and the third channel, and the liquid of the two coal beds is jointly drawn out of the well while accumulated liquid in the well bottom is avoided. According to the method and device, the gas and the water generated by the upper coal bed and the lower coal bed are jointly mined and jointly drawn through the single well, gas-liquid separation is carried out at the well bottom, the gas is drawn through a gas path, the liquid is drawn through a liquid path, pressure systems of the two coal beds are separated, interlayer interference generated during exploitation is reduced, and the gas yield is effectively increased.

A layered testing and adjustment process for an injection well mainly solves the problems that an existing testing and adjustment process is carried out separately under a well shutin circumstance, the number of devices and tools is large, and long time is consumed. The specific testing and adjustment process includes the following steps that firstly, according to an existing throwing and fishing method, blanking plugs in eccentric water distributors in various layers are fished out and then blockage type flowmeters are thrown into the eccentric water distributors in the layers; secondly, different types of injection pressure are adjusted at the mouth of the well, the injection allocation flow of the whole well is 0-150%, and three to six points are selected for pressure adjustment; thirdly, the blockage type flowmeters in the layers are fished out, and testing data are obtained; fourthly, packer seal examining is implemented; fifthly, layered flow adjustment is implemented; sixthly, layered well testing and pressure measurement are implemented. The layered testing and adjustment process for the injection well has the advantages that under a well non-shutin circumstance, layered pressure measurement is completed at the same time, the number of devices and tools is small, operators have no special skill requirements or testing and adjustment experience, and data can be synchronized.

The invention discloses a rock salt mine layered-mining pipe string and a rock salt mine layered-mining method, and belongs to the technical field of rock salt mine mining. Through the rock salt minelayered-mining pipe string and the rock salt mine layered-mining method, the defect that the prior art lacks a layered water-injection huff and puff process pipe string and a related mining method torealize layered water-injection huff and puff mining of a rock salt mine is overcome. The rock salt mine layered-mining pipe string mainly comprises an oil pipe, a hollow rod, a hollow pump, a hollowjacking rod, an outer oil pipe, an upper packer, an inner oil pipe, a flow path conversion nipple, a bridge-type passage and a lower packer, the lower end of the oil pipe is connected with the hollowpump, the lower end of the hollow pump is connected with the outer oil pipe and the inner oil pipe through double fasteners correspondingly, the lower end of the outer oil pipe is sequentially connected with the upper packer, the bridge-type passage and the lower packer, the upper packer and the lower packer are sealed on the inner wall of a casing, the lower end of the inner oil pipe is connectedwith the flow path conversion nipple, the side face of the flow path conversion nipple is connected with the bridge-type passage, the hollow rod is arranged in the oil pipe in a sleeved mode, the lower end of the hollow rod continues to be connected with the hollow jacking rod through a hollow pump plunger, and a single-flow valve is mounted in the hollow jacking rod.

The embodiment of the invention discloses a longitudinally superposed developing three-strata oil reservoir well pattern and a deployment method of the longitudinally superposed developing three-strata oil reservoir well pattern. To the longitudinally superposed developing three-strata oil reservoir, the well spacing of a basic well pattern is 2*(square root of 2)*L; after being encrypted once, the well spacing of a middle transitional well pattern is 2L; after being encrypted twice, two superposed inverted nine-spot well patterns with well spacing of 2L are formed; after being encrypted for three times, two superposed inverted nine-spot well patterns with well spacing of 2L and one superposed inverted nine-spot well pattern with well spacing of (square root of 2)*L are formed; and after pairwise alternatively development, the well spacing of the plane well pattern of each strata has a rational well spacing of L; the evolution process of the well spacing is as follows: 2*(square root of 2)* L to 2L to (square root of 2)*L to L; the middle process of well patterns conversion with a well spacing of 2L and (square root of 2)*L is added; at the same drilling speed, well placement uniformity coefficient and reserve control speed are increased; the well spacing is encrypted in the alternation of well patterns; each well pattern can realize order development to each longitudinal strata; the utilization ratio of the well patterns is improved; meanwhile, the oil reservoir is uniformly used, so that the method is in favor of increasing accumulated oil production of an oil field and improving the recovery ratio; and interlayer interference generated by commingled extracting oil in multiple oil layers of longitudinal series of strata is avoided.

The invention discloses a three-stage layered commingled production string. In order to overcome a defect that a production string cannot simultaneously exploit more than two oil layers in the prior art, the three-stage layered commingled production string is characterized in that the lower end of a tubing string is sequentially fixedly provided with a primary pump, an upper packer, an oil tube I, a suspension nipple I, an oil tube II, a secondary pump, a suspension nipple II, an oil tube III, a lower packer and a tail pipe, wherein the primary pump is positioned on an upper oil layer; the upper packer is positioned between the upper oil layer and a middle oil layer; the lower packer is positioned between the middle oil layer and a lower oil layer; internal threads at the lower end of the suspension nipple I are fixedly connected with the upper end of a seal cartridge; internal threads at the lower end of the suspension nipple II are fixedly connected with the upper end of a pump cylinder of a triple-stage pump; a hollow sealing rod of a plunger assembly is positioned in the seal cartridge; the diameter of the hollow sealing rod is smaller than the diameters of a primary pump plunger and a secondary pump plunger. The three-stage layered commingled production string has the beneficial effects that different oil layers are simultaneously exploited by feeding a string once, and the exploitation efficiency is improved.

The embodiment of the invention discloses a longitudinally superposed developing two-strata oil reservoir well pattern, and an arrangement method of the two-strata oil reservoir well pattern. The method comprises the following steps: firstly determining the longitudinal development strata of the oil reservoir and the rational well distance, and determining the well spacing of a basic well pattern and the well spacing of a middle transitional well pattern according to the longitudinal development layer coefficient. According to the longitudinally superposed developing two-strata oil reservoir, the well spacing of the basic well pattern is 2L, after being encrypted once, the well spacing of a middle transitional well pattern is square root of 2 times L; after being encrypted twice, two superposed well patterns with a well spacing of square root of 2 times L are formed; the well spacing of the superposed well pattern after alternative strata development is L; the evolution process of the well spacing is as follows: 2L to 2 times square root of 2 L to L; the conversion middle process of a well pattern with a well spacing of square root of 2 times L; in the same drilling speed, well placement uniformity coefficient and reserve control speed are increased; the well spacing is encrypted in the alternation of well patterns; each well pattern can realize order development to each strata; the utilization ratio of the well patterns is improved; and meanwhile, the oil reservoir is uniformly used, so that the method is in favor of increasing accumulated oil production of an oil field and improving the recovery ratio; and interlayer interference generated by extracting oil in multiple oil layers of longitudinal series of strata is avoided.

The invention discloses a rock salt mine layered mining pipe column and a rock salt mine layered mining method, and belongs to the technical field of rock salt mine mining. The defects that in the prior art, a layered water injection huff and puff process pipe column and a related mining method are lacked, so that layered water injection huff and puff mining of rock salt ore is not achieved are overcome. The pipe column mainly comprises an oil pipe, a hollow rod, a hollow pump, a hollow ejector rod, an outer oil pipe, an upper packer, an inner oil pipe, a flow channel conversion short section,a bridge type channel and a lower packer, wherein the lower end of the oil pipe is connected with the hollow pump, the lower end of the hollow pump is connected with the outer oil pipe and the inneroil pipe through double buckle connector, the lower end of the outer oil pipe is sequentially connected with the upper packer, the bridge type channel and the lower packer, the upper packer and the lower packer are arranged on the inner wall of a sleeve in a setting mode, the lower end of the inner oil pipe is connected with the flow channel conversion short section, the side face of the flow channel conversion short section is connected with the bridge type channel, the hollow rod is sleeved with the oil pipe, the lower end of the hollow rod is continuously connected with the hollow ejector rod through the hollow pump plunger, and a check valve is installed in the hollow ejector rod.