36results about How to "Improve sand washing efficiency" patented technology

The invention relates to a method and special tool for sand flushing, and belongs to the technical field of well repairing work. The method and special tool for sand flushing are suitable for sand flushing construction of a pitshaft of an oil-gas well. The special tool for sand flushing comprises an outer pipe and a sand flushing inner pipe. The outer pipe is formed by sequentially connecting an oil pipe, a suspension pup joint and a rotary outer cylinder in a threaded mode. The sand flushing inner pipe is formed by sequentially connecting a sealing pup joint, a flushing pipe, a rotary inner cylinder and a drill bit in a threaded mode. According to the method and special tool for sand flushing, the annular space between the flushing pipe and the outer pipe is sealed through the sealing pup joint, a sand flushing fluid circulating channel between the outer pipe and the sand flushing inner pipe is established, and direct-circulating and reverse-circulating sand flushing construction in the sliding state of the flushing pipe is achieved; and rotating power for matching between the outer pipe and the ground is transmitted through the rotary inner cylinder and the rotary outer cylinder, the sand flushing drill bit is driven to rotate, and thus the rotary-drilling sand flushing construction requirement under a complex well condition is met.

The invention discloses a condensed sand carrying agent used for an under-pressure oil gas well, and the condensed sand carrying agent is applied to the sand wash of the oil gas well in an oil gas field. The condensed sand carrying agent is characterized by comprising the following components in percentage by weight: 1-1.5% of xanthan gum, 20-25% of efficient foaming agent LF-II, 0.5-1% of potassium chloride, 0.2-0.5% of sodium carbonate, 5-8% of high-water-loss plugging agent, 0.5-1% of phenol, 0.3-0.5% of epoxy chloropropane, 0.5-0.8% of ethanol, 5-7% of carboxymethyl starch, 0.5-1% of sodium hydrogen carbonate and the rest of clear water, and the sum of the percentages of all the components is a hundred percent. The condensed sand carrying agent has the effects that the condensed sand carrying agent has favorable water solubility; when the concentration is lower, a water-soluble glue solution shows the characteristics of a plastic fluid; when the concentration is higher, a system shows the characteristics of a pseudoplastic fluid; the pollution to an underground stratum does not exist; the condensed sand carrying agent is applicable to the sand wash under a pressure and the work in an under-pressure gas well; and the problem that the seepage loss is big is solved. The solution dosage is only 50% of that of a conventional routine sand washing solution, and the pollution of a sand carrying solution to the stratum is reduced.

The invention relates to a continuous positive and negative sand washing device for an oil-water well, in particular to a continuous positive and negative integrated sand washing device for an oil well. The device consists of an operation machine, pipelines, a sand washing pipe, an elevator, a pump truck and the like, wherein a self-sealing wellhead is arranged at the upper end of a big four-way joint of the wellhead; the lower end of a sand washing pipe column is provided with a sand washer, and the upper end of the sand washing pipe column is provided with a reversing valve; the sand washing pipe column enters a well casing under the well through the self-sealing wellhead and the big four-way joint; a three-way valve is connected with a water hose and the self-sealing wellhead and is connected with a positive and negative sand washing regulation and control valve bank; the positive and negative sand washing regulation and control valve bank is in threaded connection with the pipelines respectively connected onto the pump truck, a foul solution cylinder, the three-way valve and the big four-way joint; the three-way valve realizes continuous sand washing operation in the process of carrying out continuous single-length sand washing and carrying out subsequent single-length sand washing by cooperation of the opening and closing of pairs of pipe lines with the reversing valve and the self-sealing wellhead; and the positive and negative sand washing regulation and control valve bank completes conversion by adjusting and aligning with four holes which are vertical in pairs on a valve core and eight holes on a valve body, so that the positive and negative continuous sand washing operation is realized.

The invention discloses a vortex sand washing device which comprises an upper connector, a tubing pup joint, a conversion body, a sand washing core tube, a revolving body and a sand washing head, wherein the upper connector is connected with the tubing pup joint, the conversion body, the sand washing core tube, the revolving body and the sand washing head in sequence; an annulus is formed betweenthe upper part of the inner pup joint of the conversion body and the cavity of the tubing pup joint; the lower end of the inner pup joint of the conversion body is provided with a stopper; a flow channel is arranged axially between the inner pup joint and the outer pup joint of the conversion body; the revolving body is arranged outside the sand washing core pipe and the sand washing head; and a bearing hoop is arranged between the lower cavity of the revolving body and the sand washing head. The vortex sand washing device adopts a double-tube structure, thus providing different channels for washing and upward-returning of sand washing fluid, and is characterized by high adaptability, high sand washing efficiency, high sand washing and well cleaning speed, good effect, high operation success rate and the like, thus being adapted to sand washing operation of common oil gas wells, especially to sand washing operation of highly-deviated wells and horizontal wells.

The invention relates to a cyclone sand washing device for a horizontal well. During the conventional sand washing construction of horizontal wells, the sand washing fluid and the formation sand are respectively located in the upper and lower layers of the production casing under the action of gravity, causing the construction fluid to flow from the upper layer and cannot effectively carry the formation sand in the lower layer to move together, let alone effectively Carrying formation sand back out of the wellbore, the specific performance is low construction efficiency, huge water consumption, sand washing effect, and poor construction pipe strings that are easy to be buried in sand. A swirl sand flusher for horizontal wells, comprising a vector flushing pipe and an isolated flushing pipe connected by a tubing collar, the isolated flushing pipe includes tubing shorts and tubing collars at both ends thereof, and the isolated flushing pipe passes through the The oil pipe collar is connected with the vector flushing pipe. The invention can effectively improve sand washing efficiency, reduce construction period and water consumption, prevent drill stuck accidents in sand washing operation, greatly save construction cost, and can forcibly carry formation sand back to the ground during sand washing of horizontal wells.

The invention discloses an integrated environmental protection treatment system for shield slag, belongs to the technical field of shield construction, and solves the problem of unsatisfactory treatment and recovery effect of shield slag in the prior art. Screening, sand washing, swirling, sand washing again, flocculation, pressure filtration, flocculation, etc., to obtain coarse sand, fine sand, mud cake and water, meet the requirements of material reuse and outbound transportation, and realize the reduction of shield muck It has the characteristics of integrated layout, modular installation, industrial production and intelligent control; the present invention has strong adaptability, and the system has multi-level configuration, multi-level accessories and various layout forms. It can meet the requirements of different projects on processing capacity, processing capacity, site layout and geological conditions.

The invention relates to a borehole operation tool, and specifically relates to a reverse circulation sand washing device. The reverse circulation sand washing device comprises a barrel; during sand washing, a sand washing solution passing through the middle of the barrel and the sand washing device is used for impacting the barrel so as to form a sand mixing solution; the sand mixing solution enters into a sand washing passage under the guide of a guide plate; a part of the sand mixing solution in the sand washing passage directly passes through a first filter so as to enter into a sand washing pipe column, and the part of the sand mixing solution is used for taking away tiny impurities; the other part of the sand mixing solution is used for taking large impurities into a crushing cavitythrough holes in a partition board; large sand enters into the crushing cavity along the radial direction of the barrel and collides with crushing teeth inside the crushing cavity; after the tiny impurities are formed by crushing the large sand, the small impurities enter into the sand washing pipe column through a second filter, so that the large impurities inside the sand mixing solution are crushed through the crushing cavity; and therefore, the sand washing device is avoided from being blocked by the impurities, repeated cleaning of the sand washing device is avoided, and the sand washingefficiency is improved.