16 results about "Well stimulation" patented technology

An illustrative stimulation method includes: displacing a predetermined volume of liquified gas through a wellhead valve into a service tubing string providing access to a stimulation zone of a well; and closing the wellhead valve to confine the liquified gas and pressurize the stimulation zone as the service tubing string vaporizes the liquified gas. An illustrative well configured for stimulation includes: well casing within a borehole; a stainless-steel wellhead with a valve for receiving a liquified gas; and a stainless-steel service tubing string coupled to the valve to receive and vaporize the liquified gas. The service tubing string acts as a heat exchanger, using the downhole temperatures to vaporize the liquified gas.

This invention relates to the field of oilfield development technology and discloses a modified nano-displacement agent and its application in oil well production enhancement. The agent comprises 5.0–10.0 wt% succinate gemini polyoxyethylene ether, 3.0–5.0 wt% erucamide propyl hydroxysulfonate betaine, 10.0–20.0 wt% polyether-modified silicone oil, 1.0–3.0 wt% sodium xylenesulfonate, 1.0–2.0 wt% 1,2-propanediol, and 60.0–80.0 wt% deionized water. During preparation, a phase-conditioning fluid is added via high-shear emulsification combined with a cooling jet to obtain a nanoscale dispersion system. This invention utilizes the combination of gemini surfactant and betaine to improve phase stability under high temperature and high salinity conditions and effectively reduce interfacial tension; the steric hindrance of the modified silicone oil reduces formation adsorption losses; and the nanoscale droplets can penetrate deep into the micro- and nano-pore throats of low-permeability formations to strip crude oil, alleviating injection difficulties and synergistically achieving increased oil well production.

A controllable shock wave-based coalbed methane horizontal well stimulation method, comprising: S1: selecting a group of upward directional drilling construction sites in a downhole roadway of a horizontal well service mine, directional drilling target positions being respectively coalbeds (3) directly facing horizontal well perforations (2) at multiple positions from a horizontal well; S2: performing construction drilling on a target at A meters, and determining whether the drilling target enters a fracturing influence range and whether the drilling target is within a horizontal well drainage influence range; if the drilling target is within the fracturing influence range, performing controllable shock wave construction; and if the drilling target is not within the fracturing influence range, re-constructing other target positions until a target position within the fracturing influence range is found, and then stopping; and S3, executing S2, including construction drilling and determination, for each horizontal well perforation until target positions within the fracturing influence range corresponding to all the horizontal well perforations are found, and performing controllable shock wave construction. By means of the method, the production of a coalbed methane well is increased, a seepage channel is further expanded, and the production life of the coalbed methane well is prolonged.

A composition and methods are provided for stimulating a well with nanobubbles. An exemplary method includes obtaining a stimulation fluid and generating a nanobubbles solution, wherein the nanobubbles solution includes nano-sized bubbles in the stimulation fluid. The nanobubbles solution is injected into the oil well.

The invention belongs to the field of oil and gas field development, and relates to a radial horizontal well yield and injection increasing system and method based on abrasive jet. The system comprises a forging, milling and reaming unit and a radial drilling unit, the forging, milling and chambering unit comprises a rotary faucet and a forging, milling and chambering tool string; the radial drilling unit comprises a radial drilling tool string; the forging, milling and chambering tool string is used for performing hydraulic forging, milling and chambering treatment on the casing section and the near wellbore zone reservoir to form a reservoir cavity; the radial drilling tool string is used for implementing radial horizontal drilling in a reservoir. According to the method, a casing, a well cementation cement sheath and a reservoir are subjected to erosion crushing through abrasive jet, and the casing forging and milling process and the reservoir chambering process are integrated into one pipe column operation to be completed; then, abrasive jet is conveyed through a continuous oil pipe, radial horizontal rock breaking drilling is carried out on the reservoir, and multi-layer and multi-direction radial horizontal holes are formed; the system and the method are suitable for shaft transformation operation under the conditions of low porosity, low permeability and hard reservoirs.

The present application provides a kind of shale gas well stimulation effect evaluation method, comprising the following steps: obtaining the pre-treatment production of the well of stimulation implementation and the action interval of treatment;Obtain the historical production of shale gas well, according to the historical production of shale gas well and the pre-treatment production, obtain the base profile of stimulation effect evaluation;The action interval of treatment is divided into multiple time units, and the actual gas production of the well of stimulation implementation in each time unit is obtained;Obtain the influence production of each time unit, according to the influence production of each time unit, actual production and base profile, obtain the final production of each time unit, obtain the total stimulation gas production;Obtain the input cost of treatment, according to the total stimulation gas production and the input cost of treatment, calculate the input-output ratio of treatment.The beneficial effects of the present application are: it can avoid the problems such as fluctuation of existing evaluation method and general calculation, and the calculation result is more accurate and has wide coverage.

The present application relates to the technical field of oilfield stimulation and reconstruction, and particularly relates to a biological composite plugging removal process for heterogeneous reservoirs, which comprises the following steps: (1) injecting a biological plugging removal fluid into an oil well; (2) injecting a diverting acid system into the oil well; (3) injecting the biological plugging removal fluid into the oil well; and (4) injecting a displacement fluid into the oil well. The biological plugging removal fluid first enters a high-permeability reservoir, effectively removes organic plugging caused by wax and asphaltene precipitation, and exposes inorganic impurities wrapped therein, which is beneficial to the subsequent dissolution of inorganic plugging by the diverting acid system. After the injection of the diverting acid system, the acid enters the high-permeability reservoir, effectively removes inorganic scale, and meets the needs of plugging removal in complex scale reservoirs of the oil well. With the acid-rock reaction, the viscosity of the acid system increases, temporarily plugs the high-permeability reservoir, forces the subsequent acid and biological plugging removal fluid to enter a low-permeability reservoir, so that the low-permeability oil layer is treated, and the needs of the heterogeneous oil well stimulation are met.

A hydraulic fracturing system and method uses a model trained with external pressure gauge data and LFDAS sensor data to identify pressure communication events based on LFDAS sensor data. One or more monitoring wells are established in proximity to a well undergoing well stimulation, each monitoring well including one or more LFDAS sensors. LFDAS sensor data is received from the LFDAS sensors of the one or more monitoring wells, the received LFDAS sensor data including data received after start of a well stimulation operation. Occurrences of pressure communication events at each monitoring well may then be identified based on the model and on the received LFDAS sensor data.

The invention discloses a method for increasing oil by applying nitrogen and foam system oil displacement huff and puff superposition of nitrogen in an oil well, and belongs to the technical field of oilfield development and oil well yield increase. Comprising the following steps that nitrogen with the volume being 20000 m < 3 >-200000 m < 3 > is injected into an oil well to build a front nitrogen slug with the oil displacement effect; mixing 15000-15000 m < 3 > of nitrogen and 100-800 m < 3 > of a foaming agent aqueous solution to form a mixed system, and injecting the mixed system into the oil well in the step S1 to form a nitrogen foam system slug; nitrogen with the volume of 5000 m < 3 > to 30000 m < 3 > is injected into the oil well in the step S2 to form a rear nitrogen slug; and after the steps are completed, the measure oil well is shut down for 5-10 days, and then normal production is carried out. According to the oil increasing method, the oil displacement effect of the huff and puff measure oil well is enhanced, and the displacement capacity is formed for other adjacent oil wells; meanwhile, after normal production of the huff and puff well, the obvious water reducing and oil increasing effects are achieved, superposition of oil displacement and oil increasing and huff and puff oil increasing is achieved, the crude oil yield of the whole complex small fault block oil reservoir is greatly increased, and the water yield of the oil well can be reduced.

A method for stimulation of a subsea oil and gas well is provided, comprising the deploying a tree cap on a subsea well using a remotely operated vehicle (ROV), wherein the tree cap includes one or more fluid receptacles; deploying a rigless stimulation tool (RST) in a predetermined location on the sea floor away from the well and other subsea production system infrastructure; deploying at least one flexible well service jumper (WSJ) conduit having a first end connector and a second end connector from a well stimulation vessel (WSV), where the WSJ conduit includes a plurality of attached buoyant members sufficient to enable movement by the ROV under an overhead obstacle, such as a mobile offshore drilling unit (MODU) or platform; operating the ROV to move the first end connector of the WSJ conduit to a first location near the tree cap and temporarily securing the securing the first end connector to the tree frame sufficient to enable flushing of the WSJ conduit with a hydrate inhibitor fluid; connecting the first end of the WSJ conduit to the tree cap; operating the ROV to connect fluid stimulation conduits to the RST to enable a fluidic connection; and delivering a well stimulation fluid via the fluid stimulation conduits through the RST and via the WSJ conduit to the well.

A hybrid drive system that uses multiple sources of mechanical energy to drive an oilfield apparatus is provided. The hybrid drive system may include a first mover for generating first mechanical energy, the oilfield apparatus, a drivetrain for providing first mechanical energy from the first mover to the oilfield apparatus, and a second mover to generate and provide second mechanical energy to the oilfield apparatus. The second mover comprises an electric motor / generator. The second mover can, at times, be operable to provide excess power that can be used elsewhere at the wellsite.

A method and system for optimizing the design and fracturing scheme of shale gas horizontal wells, belonging to the field of oil and gas field development, includes: multi-source data collection and preprocessing; multi-source data fusion to generate a high-precision three-dimensional geological model; establishing reservoir attribute models and natural fracture models respectively, and predicting the activity of natural fractures; evaluation of geological engineering parameters, evaluation of vertical and horizontal sweet spots, and well location deployment; drilling / fracturing geological design; fracturing site tracking and post-fracturing production effect evaluation; using numerical simulation technology to predict the degree of shale gas horizontal well stimulation and gas well productivity, and continuously adjusting and optimizing the shale gas horizontal well design and fracturing optimization scheme based on the prediction results and feedback from actual production data. This invention has the advantages of high accuracy and reliability in reservoir evaluation, while reducing construction risks and improving development results; it also improves the productivity and economic benefits of shale gas horizontal wells.

This invention belongs to the field of oil and gas field development and relates to an integrated system and method for abrasive jet casing window opening and sidetracking. The system includes a drill pipe, the top of which is connected to the drive unit of the drilling rig, and the bottom of which is connected to a window opening and sidetracking tool string. The window opening and sidetracking tool string is composed of an electro-hydraulic orienting device, a bend joint, a connecting sub, a shaping milling tap, and a hydraulic drill bit connected in sequence. Both the drill pipe and the window opening and sidetracking tool string have abrasive slurry passage chamber inside. The method utilizes abrasive jets to perform non-contact window opening in the casing section, and continuously enters the sidetracking stage during the same tool string operation. The orienting of the tool string is controlled by the electro-hydraulic orienting device, and the small-angle geometric offset provided by the bend joint ensures that the sidetracked wellbore extends along a predetermined direction. When necessary, the window is milled and shaped by the shaping milling tap, which reduces the frequency of process switching, reduces operational risks, and improves the controllability of the window opening position and wellbore trajectory. It is suitable for engineering applications in old well stimulation and complex well conditions.

The invention belongs to the technical field of oil and gas well yield increase, and provides a full-working-condition fracturing intelligent early warning method and system, a storage medium and electronic equipment. The method comprises the steps that historical fracturing construction curves are divided into a normal construction curve set and an abnormal construction curve set; performing datamation superposition on the normal construction curves in the normal construction curve set to generate a standard curve; determining a floating threshold value of the standard curve to form upper and lower envelope surfaces of the standard curve; calling a standard curve, and aligning time coordinate axes of the current construction curve and the standard curve in real time; taking the upper and lower envelope surfaces of the standard curve as early warning boundaries, performing fracturing process monitoring on the current construction curve, and generating an early warning result; and forming an adjustment strategy and an action scheme decision according to an early warning result, and performing feedback. According to the method, automatic diagnosis, early warning and quick response of all-working-condition abnormity of fracturing are achieved, the fracturing process is adjusted in time, the construction risk is eliminated, and the fracturing construction efficiency and the engineering quality are guaranteed.

The invention discloses a method and device for evaluating the yield increasing capacity of a shale gas well. The method for evaluating the yield increasing capacity of the shale gas well comprises the steps that stratum energy basic information, material basic information and effective fracture flow capacity information of a target shale gas well are determined respectively; based on the stratum energy basic information, the material basic information and the effective fracture flow capacity information, yield increasing capacity information of the target shale gas well is determined; and evaluating the yield increasing capacity of the target shale gas well based on the yield increasing capacity information. The problems of excessive basic data, excessive related fields, lack of unified evaluation standards and the like are avoided, expression of the yield increasing capacity of the target shale gas well is clear, the yield increasing capacity of the target shale gas well is evaluated, the used data volume is small, and the yield increasing capacity of the target shale gas well can be evaluated stably. And quantitative evaluation of the yield increasing capacity of the shale gas well is realized.

The application discloses a high-viscosity oil well stimulation method, and relates to a high-viscosity oil well, thickened oil well development and utilization technology in the field of oil and gas field stimulation reconstruction. The high-viscosity oil well stimulation method comprises the following steps: obtaining reservoir data, including the content of gum bitumen in crude oil components, the viscosity of crude oil and the formation fracture pressure; injecting an organic cleaning agent into the formation under the fracture pressure; injecting acid liquid into the formation to unblock under the fracture pressure, shutting down for 0.5-2 hours; sequentially injecting a crack wall modifier and a synergist into the formation under the fracture pressure, shutting down for 0.5-1 hour; opening the well to flow back and recovering production. The application has reliable principles and simple process, adopts the synergistic effect of multiple schemes such as organic unblocking, inorganic unblocking, crack formation and consolidation modification of main flow channels, forms integrated operation of high-viscosity oil well unblocking, stimulation and long-term effect, solves the problems of high-viscosity oil well plugging damage and low production caused by the deposition of asphaltene components in the process of crude oil exploitation, realizes high-viscosity oil well unblocking, stimulation and the extension of the effective period of stimulation, and has wide application prospect.