49results about How to "Improve construction capacity" patented technology

The present invention provides a method for constructing a chair-type, self-supported earth retaining wall used for retaining external forces such as earth pressure prior to an excavation. The method of the present invention forms a first column of piles having a plurality of piles arranged along the circumference of the region to be excavated. Subsequently, the method comprises forming a second column of piles having a plurality of piles by consecutively perforating a plurality of holes by a predetermined spacing at predetermined positions outwardly from the first column of piles, along the circumference of the region to be excavated, inserting H-beams into the respective holes, filling left and right spaces of the webs of the H-beams with soil, and filling the outer spaces of the flanges of the H-beams with a flowable stiffening material. The method subsequently comprises interconnecting the first column of piles and the second column of piles by a connection member. The first column of piles and the second column of piles are formed along the circumference of the region to be excavated, with an outward spacing, and connected to each other by the connection member.

The present invention provides a method for constructing a chair-type, self-supported earth retaining wall used for supporting external forces such as earth pressure prior to an excavation. The method of the present invention comprises forming a first pile array 20 having a plurality of piles 22 arranged along a circumference of an region to be excavated. Subsequently, the method comprises forming a second pile array 30 having a plurality of piles arranged along a circumference of the to-be-excavated region by consecutively drilling a plurality of boreholes 31 at predetermined intervals at predetermined positions outwardly spaced apart from the first pile array, inserting H-beams into the respective boreholes, filling left and right spaces of webs 34 of the H-beams 32 with soil 40, and filling the outer spaces of flanges 36 of the H-beams with a flowable hardening material 50.

The method subsequently comprises fixedly interconnecting the first pile array and the second pile array using a connection member. The first pile array and the second pile array are formed in such a fashion as to be outwardly spaced apart from each other along the circumferences of the to-be-excavated region, and are connected to each other by the connection member to construct an underground earth retaining wall.

Provided are a directional hydraulic injection tool string and a construction method for a coal-bed gas horizontal well. The directional hydraulic injection tool string is characterized by comprisinga guide cone, a screen pipe, a centering device one-way valve, a hydraulic anchor, a packer, an ejector, a hydraulic eccentric orientator, an upper centering device, a hydraulic releasing and an oil pipe which are sequentially connected, the hydraulic eccentric orientator is connected with the ejector through a fixed manner, the upper end of the hydraulic eccentric orientator and the lower end ofthe ejector are respectively through the upper centering device and the packer connected with an upper movable bearing and a lower movable bearing, and under the action of hydraulic, the eccentric orientator drives the ejector to achieve the function of directional ejection; the directional hydraulic injection tool string has reasonable design and complete functions, and higher reliability, stability and safety of the combined system, can achieve the function of outer pipe anti-channeling and fixed point fracturing, also achieve hydraulic sand blast perforation of large displacement, large hole, and orientation and subsection fracturing operation of large displacement and a large scale, is applied to the construction of coal-bed gas horizontal wells with complex conditions, such as cementing wells, uncementing wells and the like, and the directional hydraulic injection tool string has the advantages of high construction efficiency, low construction cost, a large scale of production increasing and improvement, high success rate of the construction and a good reconstruction effect and the like.

The invention discloses a process of afloat ship twin-islet jointing. The process is characterized by comprising the flowing steps of: a, dividing a whole ship into two islets, building the two islets at the same time in a dock; b, performing ballast trimming on adjacent butt joint sections so that the afloat condition and draught of the two butt joint sections are consistent; c, centering, gathering and positioning the two sections; d, draining the dock so that the two islets fall down at specified docking blocks; e, draining a jointing partition; and f, performing assembling and jointing operation so as to complete the overall jointing work of a built object. The process has the advantages that the traditional concept that the construction contract is based on underwater facilities is broken through, and the construction capacity is improved on the basis of the advance of the process technology. The process is adapted to product market, and a large number of investment risks can be avoided, therefore the process is a positive construction method.

The invention relates to a coal mine underground gas extraction long drilled hole and coiled-tubing-in-casing perforation staged fracturing method. The method includes the steps that first, a gas extraction long drilled hole is constructed in a mudstone or sandstone roof with a certain distance to the top boundary of a broken soft coal seam or a hard layer of the broken soft coal seam or a hard coal seam with a good coal body structure; second, a guiding shoe and a rigid casing are lowered; third, cement paste blocking is carried out on annular space between the gas extraction long drilled hole and the rigid casing so as to solidify the hole; fourth, packing staging is carried out through a mode of dragging a packer by coiled tubing, an ejector carries out sand blasting perforation, and fracturing is carried out on the annulus between the coiled tubing and the casing; fifth, a fracturing tool is lifted out, and uniform blowout of fracturing fluid is carried out. The method can solve the problems that in existing gas extraction hole-drilling, hole forming is difficult, the crack initiation position of fracturing cracks is not determined, the fracturing cracks extend short, the fracturing modification effect is poor, the extraction affecting range is small and nonuniform, and extraction duration is short, and realizes gas extraction long drilled hole forming and multi-level precise staged fracturing.

The invention relates to 3D-printable copper slag electromagnetic wave-absorbing concrete and a use method thereof. The concrete includes, by weight, 6.8-7.2 parts of quick-hardening ordinary Portlandcement, 6.9-7.1 parts of quartz sand, 1.65-1.75 parts of copper slag, and 0.28-0.71 parts of copper powder composed of brass powder and red copper powder according to the weight ratio of 7:2.5-3.5, 0.75-0.85 parts of silica fume, 0.09-0.15 parts of a water reducer, 0.04-0.07 parts of basalt fiber being 11-14 mm in length, 0.003-0.005 parts of hydroxypropyl methyl cellulose being 20,000-70,000 inviscosity, and 1.70-1.74 parts of water. With the copper slag and copper powder as raw materials, the concrete has both the printability and electromagnetic wave-absorbing effect of the copper slag and copper powder, so that the concrete allows 3D printing and can achieve more than 90% in electromagnetic wave absorption in the bandwidth of 3.4 GHz.

The invention relates to an oil and gas well fracture network system fracturing technology. The method comprises the following steps that perforation is carried out on an oil pipe; packers are utilized for blocking the upper end and the lower end of a perforated hole; fracturing liquid is injected through the perforated hole to enable a stratum to form a main fracture; a temporary plugging agent is used for plugging the main fracture; pressure of the fracturing liquid is increased to 5-10 MPa, the fracturing liquid is injected again by means of the perforated hole to enable the stratum to form a larger number of secondary fractures around the main fracture. The fracture network system fracturing technology is provided for increasing the yield of an oil and gas field, natural fractures around a shaft and the artificial fractures can be distributed in a staggered mode to form an artificial fracture three-dimensional network, the swept volume of the fractured fractures in a reservoir can be maximized, and the well seepage size after fracturing is increased by folds, so that the purpose of increasing the yield and the injection amount is achieved.

The invention relates to a well cementation casing or tubing sliding sleeve without limit on the number of segments or clusters, comprising an upper joint, a variable-diameter cylinder, a sliding sleeve body, and a lower joint. The upper joint is connected with the variable-diameter cylinder, the variable-diameter cylinder is connected with the sliding sleeve body, and the sliding sleeve body is connected with the lower joint. Grooves are arranged on the inner wall of the variable-diameter cylinder to make a variable-diameter area formed on the inner wall of the variable-diameter cylinder, and an elastic cylinder is installed in the variable-diameter area. Multiple fracturing ports are uniformly distributed in the middle of the sliding sleeve body along the circumference. The inner wall of the sliding sleeve body has a diameter expanding area which is disposed below the fracturing ports. An inner sliding sleeve is arranged inside the sliding sleeve body. The lower end inside the sliding sleeve body is equipped with a C ring. With the sliding sleeve, vertical and horizontal wells in oil and gas fields can be fractured in a layered manner under the conditions of an unlimited number of segments and an unlimited number of clusters between segments. Before fracturing, a wellbore is full-pass, and the sliding sleeve and a ball seat are non-throttled. The construction capacity is larger, the fracturing effect can be significantly improved, and the production capacity of a single well can be increased. After fracturing, a ball made of soluble material and the C ring are dissolved or drilled and ground, and the well bore is full-pass again, thus facilitating later production and operation.

The invention relates to a multi-dimensional pipe fracturing method for a low-yield well in a low permeability oilfield. The multi-dimensional pipe fracturing method is characterized by comprising thefollowing steps that (1) fracturing liquid is injected through a low-displacement pump to displace oil and water or oil and water mixtures in initial fracturing artificial fractures; (2) the construction displacement is increased, and propping agents in the initial fracturing artificial fractures are suspended in the fracturing liquid; (3) through filtration of the fracturing liquid in a stratum,the propping agents are transported to the ends of the initial fracturing artificial fractures to be accumulated; (4) the construction displacement is increased to increase the net pressure in the fractures, and the micro fractures are opened; (5) after the fracturing liquid capable of carrying acid liquor corrodes the wall faces of the main fractures and the micro fractures, sand fracturing is conducted; (6) after fracturing operation is completed, blowout is controlled; and (7) construction is completed. According to the multi-dimensional pipe fracturing method, repeated fracturing of the low-yield well in the oilfield is achieved through optimization of the process method to open the micro fractures to form a multi-dimensional pipe fracturing system, and the target of increasing the single well yield of the low-yield well in the oilfield is achieved.

The invention discloses a horizontal well fracturing method for promoting fracture height extension through two times of acid injection and inter-cluster temporary plugging. The horizontal well fracturing method comprises the following steps that planar flow-limiting perforation operation is conducted; variable-displacement acid pretreatment operation is conducted; a main fracture is built by adopting a high-viscosity glue solution, and the fracture is expanded by adopting low-viscosity slickwater; fracturing fluid carrying calcium carbonate particles is injected; fracturing fluid carrying theacid-resistant hollow temporary plugging ball is injected; low-viscosity slickwater is injected; acid liquor is injected to dissolve the calcium carbonate particles; the fracturing fluid is continuously injected; displacement operation is conducted; a bridge plug is lowered; and the steps are repeated until all sections are constructed, and plug drilling, flowback, testing and production solvingafter fracturing are conducted. According to the horizontal well fracturing method, planar flow-limiting perforation, calcium carbonate particle temporary plugging and acid-resistant hollow temporaryplugging ball temporary plugging processes are adopted, the single-cluster displacement is increased, the extension length of fractures in the height direction is effectively increased, uniform fracture initiation and extension of multiple clusters of fractures are promoted, finally, the longitudinal use degree of a shale gas reservoir is finally increased, the reservoir transformation size is increased, and finally, the efficient development of the shale gas reservoir is realized.

The invention discloses a method for repeated acid fracturing of deep carbonate rock weighted foam acid and application. The method comprises the steps that an alternate injection mode of low-viscosity gel acid and weighted clean foam diverting acid is adopted, a viscous fingering effect is utilized, a non-uniform etching effect is generated in a main crack and a diverting crack, and the transformation size and flow conductivity of an acid etching crack are improved. According to the method, the filtration degree of an original crack can be effectively reduced, the extension length of the crack during repeated acid fracturing is increased, the crack is promoted to divert, and the transformation range of repeated acid fracturing is further expanded.

The invention belongs to the field of oil and gas reservoir exploitation, and particularly relates to a multi-layer small sand body comprehensive fracturing method for sedimentary microfacies of an underwater shunt channel. The method comprises the following steps: aiming at a small sand body tight gas reservoir of which the sedimentary microfacies is an underwater shunting river channel and the longitudinal target layers are more than two layers, according to the sand body positions of the target layers, performing first fracturing construction, changing the heterogeneous difference between the target layers, then performing fracturing construction for at least one time, and performing fracturing transformation on the target layers. The small sand body tight gas reservoir of the sedimentary microfacies of the underwater shunt channel has the characteristics of multiple layers, compact lithology and poor physical property, and the conventional fracturing is easy to cause that fracturing fluid only enters a loose stratum, so that a small sand body layer is under-transformed. According to the method, the heterogeneous difference between the target layers is changed through at least two times of fracturing transformation according to the positions of the sand bodies where the target layers are located, then the fracturing effect on all the target layers is improved, and the gas production degree of the oil reservoirs can be improved.

The invention relates to a large-diameter multi-layer fracturing string applicable to an environment of 120 DEG C and 70 MPa. The large-diameter multi-layer fracturing string applicable to the environment of 120 DEG C and 70 MPa mainly solves the problems of obvious throttle effects and high friction resistance of existing multi-layer fracturing strings and is characterized in that the bottom of a safe joint (1) is connected with a hydraulic anchor (2), the bottom of the hydraulic anchor (2) is connected with a plurality of packers (3), the upper portions of the packers (3) are connected with a sand blaster. The large-diameter multi-layer fracturing string applicable to the environment of 120 DEG C and 70 MPa achieves a large channel and has the advantages of reducing throttle losses and friction resistance.