97results about How to "Increase the volume of the transformation" patented technology

The invention relates to the technical field of hydraulic fracturing capacity increasing revamping of oil and gas reservoirs, in particular to a method suitable for effective flow guide for fractures in fracturing of a shale oil pool reservoir. The method includes the following steps that A, the reservoir is pretreated through acid liquor; B, the main fracture is constructed through low-viscosity fracturing fluid; C, the micro fractures and the branch fractures are opened by injecting low-viscosity slickwater; D, slugging is conducted by injecting low-viscosity acid liquor and low-viscosity slickwater alternately; E, low-viscosity slickwater carrying a proppant and low-viscosity fracturing fluid carrying a proppant are injected in sequence so as to support a micro fracture system and a branch fracture system, and the first proppant is different from the second proppant; F, intermediate-viscosity fracturing fluid carrying proppants is injected so as to support a main fracture system; and G, the fourth proppant in a shaft is completely displaced to the openings of the fractures by means of the low-viscosity slickwater.

The invention discloses a method applied to evaluation of flow conductivity of shale-gas-combined sand fracturing fracture. The method comprises the following steps: a, simulating a sand bar transporting process in shale-gas-slickwater-combined sand fracturing fracture by means of an experiment device for simulating flowing of proppants in a visual fracture net to obtain sand bar transporting video of the combined sand fracturing fracture under different experiment conditions; b, obtaining a distribution curve of the proppants with different particle diameters by virtue of a gray processing method and a point-by-point scanning method and obtaining distribution shape function of the proppants with different particle diameters by virtue of a linear regression method; c, building the sand bar distribution shape function of an API flow guide chamber by utilizing geometric similarity principle according to the size of the API flow guide chamber, paving shapes of the corresponding proppants and implementing evaluation of flow conductivity of shale-gas-combined sand fracturing fracture. The method is capable of simply and accurately implementing quantitative evaluation of the flow conductivity of shale-gas-combined sand fracturing fracture; experiment support is provided for optimizing the combined sand fracturing design and improving the flow conductivity of the shale fracturing fracture.

The invention discloses a recognition and interpreting evaluation method for shale reservoir fractured fractures. The recognition and interpreting evaluation method mainly comprises the steps of hydraulic fracture dynamic recognition of a shale reservoir under different stratum prestress conditions, three-dimensional natural fracture and hydraulic fracture network reconstruction and fracture network recognition and interpretation based on microseismic monitoring. The recognition and interpreting evaluation method achieves complex fracture network distribution form cognition and evaluation on the basis of hydraulic fractured fracture dynamic recognition and fracture comprehensive correction of microseismic monitoring interpretation to guide a fracture optimally designed fracture-microseism integrated fracture network prediction and evaluation technology and has important production significance for optimizing fracture construction parameters such as the fracture construction scale, the discharge capacity and the sand adding quality, reducing production cost and improving the fracture improvement effect.

The invention discloses a method for fracturing multiple horizontal bedding fissures of shale gas. The method includes the steps of carrying out acid pretreatment on a target shale bed to lower the fracturing pressure of shale beds; carrying out first-stage fracturing treatment on the target shale bed subjected to the acid pretreatment to lower the extension speed of fractures of the shale beds; carrying out second-stage fracturing treatment on the target shale bed subjected to the first-stage fracturing treatment to increase the length of the fractures of the shale beds; and carrying out propping agent filling and supporting on the target shale bed subjected to the second-stage fracturing treatment to maintain complex fractures formed by fracturing. According to the method, the control degree of the fractures of the shale beds can be improved, the modified size can be increased, and the post-fracturing effect can be improved.

The invention provides a method and system for optimizing spacing of shale fracture network perforation clusters. The method and system analyze and solve changes of induced stress during full three-dimensional expansion of multiple fractures in the case of multiple perforation clusters by employing finite element numerical simulation, local maximum and minium horizontal main stress difference around fractures is eliminated by using inter-fracture stress interference, local horizontal main stress of a stratum is approximately isotropic, a local optimum stress field is formed, main facture diverting and natural fracture opening are promoted, and a network of fractures is thus formed.

The invention discloses a downhole directional hydraulic jetting tool ground control method. The downhole directional hydraulic jetting tool ground control method comprises that a, when reaching a jetting well depth position, the downhole directional jetting tool is started by means of ground control; b, after the downhole directional jetting tool is started, the circumferential orientation of a jet hole along the borehole is identified, after it is determined that the jet hole is in the downhole initial circumferential orientation, contrastive analysis is carried out on the initial circumferential orientation and a set final jetting orientation, and the direction and angle by which a spray gun needs to rotate are obtained; c, the spray gun is controlled to rotate by the needed direction and angle, the circumferential orientation of the jet hole along the borehole is adjusted to the appointed orientation; and d, after the jet hole in the pray gun is adjusted in place, directional jetted particle perforation is started, and fracture acidizing construction is carried out. According to the invention, the orientation of the jet hole can be adjusted, influence brought by downhole obstructions and spray gun vibrations can be effectively prevented, the directional jetting task can be completed reliably, and interference brought by rotation of the tool during the descending process can be avoided.

The invention relates to the technical field of coal bed gas exploration and development, in particular to a coal bed gas U-shaped well staged fracturing exploitation technology. The technology includes the steps of firstly, performing U-shaped well completion; secondly, performing U-shaped horizontal well horizontal section staged hydraulic spraying and sand fracturing; thirdly, communicating the U-shaped horizontal well with a vertical shaft again; fourthly, pumping and exploiting. The technology has the advantages that beneficial well sections can be selected, compaction zone pollution can be eliminated, crack turning can be avoided, crack extension can be guaranteed, crack with sufficient width can be achieved, stratum crack initiation pressure is lowered, coal bed modification volume is increased, coal bed permeability is increased effectively, oil draining area is increased, shaft seepage velocity is increased, output is increased, post exploitation process is simplified, operation cost is lowered, and coal bed gas exploitation effect is increased effectively.

The invention discloses a method for optimizing the multi-section fractured horizontal well network crack parameter. The method comprises the steps that a reservoir characteristic parameter of a target block is obtained; based on the reservoir characteristic parameter, a model of network cracks, including main cracks and secondary cracks, of a multi-section fractured horizontal well of the target block is established; the network crack parameter of the network crack model is designed; and based on the orthogonal test method, the network crack parameter is optimized and determined. According to the method, the optimal network crack parameter setting of the multi-section fractured horizontal well including the main cracks and the secondary cracks can be obtained at a time, and an optimized result can effectively guide fracturing operation, greatly increase the modification volume, and remarkably improve the construction effect.

The invention discloses a method for increasing the fracturing volume in a tight sandstone reservoir. The method includes the steps that (1) micro-fractures are formed in the tight sandstone reservoir; step (2) the micro-fractures are expanded and communicated; step (3) hydraulic fracturing is performed to form main fractures; and step (4) a proppant is turned from temporary blocking to form branch fractures. The method is suitable for fracturing transformation production increase operation of the tight sandstone reservoir with micro-fractures not developed. Through innovative process ideas, first, a large number of radial micro-fractures are artificially generated in a sandstone reservoir with the micro-fractures not developed and a dense matrix, then the main fractures penetrating through the micro-fractures are formed through hydraulic fracturing, and in the extension process, the main fractures are turned for multiple times, so that a complex fracture system is formed, and the fracturing transformation volume is increased and the production increase effect is improved.

The invention provides a small fracturing test method suitable for a shale gas well. The method comprises the following steps that (1) acid pretreatment is conducted, (2) the stable injection time and liquid quantity of the highest discharging quantity are determined; (3) step increasing is conducted, specifically, the discharging quantity is gradually increased to the highest discharging quantity in a stepped mode; (4) step decreasing is conducted, specifically, the discharging quantity is gradually decreased from the highest discharging quantity in a stepped mode; and (5) pressure decreasing testing is conducted, specifically, after fracturing pumping stopping, pumping stopping and well shutdown are conducted for a preset time till an inflection point appears at the pressure decreasing curve. According to the small fracturing test method suitable for the shale gas well, key characteristic parameters, such as the minimum horizontal principal stress, the fracture closure time, the natural fracture development degree and the stratum leak-off condition, of a shale formation can be obtained, the effect of fractural diverting inducing is achieved, a foundation is laid for fractural diverting or complex fracture forming in main fracturing, the transformation size of main fracturing is increased, and the fracturing effect of main fracturing is improved. The small fracturing test method is reasonable in design, simple in technique and convenient to operate.

The invention discloses a method for improving the complexity of a fracture and the construction efficiency of a horizontal well, and is designed to solve the problems, such as low complexity and small discharge volume of the fractured fracture of the horizontal well. The method is characterized in that a plurality of the horizontal wells are deployed in the same well site, shafts of the horizontal wells are parallel mutually, and each shaft is perpendicular to a maximum principal stress direction of a stratum; positions of perforated intervals of each adjacent well are distributed in a staggered manner; each adjacent well is fractured in sequence in a staggered manner. In the process of fracturing, as each shaft is subjected to stress interference caused by staggered fracturing in sequence, a large amount of high-complexity microfractures in staggered distribution are generated on both sides of each fracture, thus the reconstruction volume of an oil layer is increased, and the single-well yield is improved. In addition, the intervals between the fracturing sections of the horizontal wells are lengthened, thus the number of the fracturing sections can be decreased, the single-well fracturing cycle can be shortened, and the construction efficiency can be greatly enhanced.

Disclosed is a method for transforming a coal-bed gas well into a coal-measure gas well. The method comprises the following steps that (1) the ground coal-bed gas well to be transformed is selected; (2) an indoor reservoir damage test is conducted on coal rock samples collected by coring the ground coal-bed gas well in the step (1), and a low damage fracturing fluid is prepared; (3) a layer section to be transformed is determined according to the ground stress profile, the TOC profile and the rupture pressure profile, and a re-perforating perforation layer is determined according to the relative position relationship of early-stage coal-bed perforation situations, coal rock body structures and the low damage fracturing fluid with the anti-swelling rate and coal rock layers of mud rock, anda re-perforating perforation plan is established; (4) a fracturing mode of transforming each layer section for multi-layer section transforming is determined, except for the uppermost layer section,the rest of the layer sections adopt oil pipe + packer fracturing, and the fractured layer sections are blocked by using sand filling or a packer; and (5) the low damage fracturing fluid and a supporting agent are pump-cast by stages.

The invention provides a horizontal well back-mixing, fracturing and pumping-in method for a compact reservoir oil deposit. The horizontal well back-mixing, fracturing and pumping-in method comprisesthe following steps: a first prepad fluid stage, wherein the first prepad fluid is injected into a target measure layer, and the first prepad fluid is high-viscosity fracturing fluid; a second prepadfluid stage, wherein second prepad fluid is injected into the target measure layer and a supporting agent is added in a slug mode, and the second prepad fluid is low-viscosity fracturing liquid; a sand-carrying fluid stage, wherein sand-carrying fluid is injected into the target measure layer, and the supporting agent is continuously added, and the sand-carrying fluid is high-viscosity fracturingliquid. Through a back-mixing, fracturing and pumping-in process of sequentially injecting the fracturing liquid into the target measure layer according to a sequence, from high to low and then from low to high, of viscosity of the fracturing liquid, so that effective formation of a complex seam net is realized while multiple perforation clusters in horizontal wall multi-section fracturing are ensured to be fractured in a balanced mode, and therefore, modification area is increased, and the oil well yield is increased.

The invention discloses a multistage dynamic temporary blocking volume acid fracturing method. According to the multistage dynamic temporary blocking volume acid fracturing method,"multistage physical temporary blocking" and "multistage chemical temporary blocking" are treated as principle thinking, and multistage hydraulic fracturing with sand and multistage injection acid fracturing are combined. According to pump injection sequence of front-loading linear glue with certain concentration to make seams, saturating a reservoir, improving flow conductivity of fractures by propping agents with the small grain size or composite grain size, and injecting degradable acid-resistant fiber temporary blocking fluid, through multistage with large displacement, the fracture physical steering transformation is achieved; and then through a multistage interval type with large displacement, different types of acid liquors "mutual solvent, gelled acid, steering acid..., mutual agent" are injected, and thus fracture chemical temporary blocking steering transformation is achieved. According to the multistage dynamic temporary blocking volume acid fracturing method,the pertinence and the flow conductivity of the reservoir are improved, the loss of the acid liquors are lowered, the etching length of the fractures are increased, the transforming volume of the reservoir is enlarged by fracture steering, and thus the target that the individual well producing rate is improved by effective transformation of the cloud-like carbonate rock reservoir is achieved.

The invention provides a radial multi-branch drilling and temporary plugging fracturing combined well completion method and device, and application. The radial multi-branch drilling and temporary plugging fracturing combined well completion method comprises the steps that data interpretation results such as earthquakes, well logging and oil reservoir numerical simulation are comprehensively utilized, and a high-pore pressure region reservoir is determined; casing cutting window is completed, and multi-branch radial holes are drilled in the high-pore pressure region reservoir through high-pressure water jet spraying drill bits conveyed by a continuous pipe and a high-pressure hose; and the continuous pipe, the high-pressure hose and the spraying drill bits do not need to be pulled out, temporary plugging fracturing liquid containing a temporary plugging agent is pumped directly through the continuous pipe to fracture the radial holes, and pipe string radial multi-branch drilling and temporary plugging fracturing combined well completion is achieved. A high-pressure area with rich reserves directionally communicates through the multi-branch holes, fracturing cracks are induced to beinitiated, meanwhile, a temporary plugging agent material plugs the dominant cracks extending towards a low-pressure area, thus the cracks turn to the high-pressure area, effective communication and utilization of the reserves in the high-pressure area are achieved, and the unconventional oil and gas recovery rate is increased.

The invention relates to a fine layering reconstruction method. The method includes the following steps: S101, collecting geology, well drilling, well detection, well logging and well cementation dataand production situations of a to-be-fractured well, calculating rock mechanics parameters, and determining a well completion mode and a perforation scheme; S102, designing a fracturing scheme, and determining the number of fracturing fissures and parameter optimization, wherein parameter optimization includes sand adding scale optimization with continuous section interpretation of ground stressas a basis, construction parameter optimization with obtaining of expected fissure support as a target, and fracturing optimization control with test fracturing as a basis; and S103, ensuring fracturing fluid performance, adjusting a main fracturing pump sequence and providing a temporary plugging agent in a construction process to ultimately increase single-well yield and control reserves. According to the fine layering reconstruction method provided by the invention, the complex network fissures can be formed, a larger reconstruction volume can be obtained, and then the single-well yield andoil and gas recovery ratios are significantly increased. In addition, the method is simple to operate, is lower in costs, and has important significance for development of oil and gas fields.

The invention relates to a three-level compound petroleum yield increasing method. The method comprises the following steps that 1, a core sample is selected to conduct an acid solution ratio experiment, an acid-etched fracture conductivity experiment, and a fracture conductivity experiment of a placing propping agent, the acid solution ratio is measured through the acid solution ratio experiment, flow conductivity parameters are measured through the acid-etched fracture conductivity experiment and the fracture conductivity experiment of the placing propping agent respectively, the yield is predicted based on the measured flow conductivity parameters, and if the acid solution ratio is above 20% and the predicted yield reaches an index value, an acid fracturing, hydraulic sand fracturing and matrix acidizing three-level compound yield increasing method is selected and conducted; 2, according to the sequence of acid fracturing, hydraulic sand fracturing and matrix acidizing, the acid fracturing, hydraulic sand fracturing and matrix acidizing are conducted for increasing the petroleum yield respectively.

The invention relates to a new method for increasing the reservoir reconstruction volume through a subdivision cutting and temporary plugging steering combined technology, and belongs to the field ofpetroleum and natural gas exploitation. The invention aims to provide the new method for increasing the reservoir reconstruction volume through the subdivision cutting and temporary plugging steeringcombined technology to solve problems, subdivision cutting of a horizontal well is achieved through fast drilling bridge plugs and high-density clustered jet holes, and fracturing fluid and active fluid are injected to open a first-stage artificial fracture in a pressing mode; then sand-carrying fluid containing cleaning steering material fluid is injected to temporarily plug the fracture which ispressed to be open before and a blast hole, the fracture is forced to steer longitudinally, and displacement fluid is used for displacing; and finally a fracture lattice structure is formed. According to the new method, through an adopted subdivision cutting method, high-density artificial fracture well completion is conducted to sufficiently cut a reservoir so as to achieve reservoir working volume maximization, and the production efficiency of all jet hole clusters can be improved by combining with a temporary plugging steering technology; and meanwhile, large-displacement fracturing construction is conducted, the complexity degree of the artificial fractures can be increased, the petroleum leakage area is increased, and the reservoir reconstruction volume is increased.

The invention discloses a crack forming method for multiple scales of cracks. The crack forming method comprises the following steps that basic parameters comprising micro pore-throat structure parameters, rock mechanics parameters and ground stress characteristics of a rock core of a reservoir stratum are measured; artificial rock samples are prepared according to the basic parameters, physical simulation experiments for rock core crack rupture and extension are carried out on the artificial rock samples, and the rupture pressure characteristics and elongation characteristics of the artificial rock samples under different fracturing fluid viscosity and displacement combination are determined; based on the rupture pressure characteristics and elongation characteristics determined by the physical simulation experiments, a crack forming technology for the two or more levels of scales of cracks is determined through a reservoir crack extension physical simulation system; and sequential crack forming construction of the multiple scales of cracks is conducted according to the crack forming technology. According to the crack forming method, the complexity of the fracturing cracks can beincreased, the crack forming success rate of the complex cracks is increased, thus the reservoir transformation volume is increased, and efficient production increasing and stable production are achieved.