Continuous direct cycle sand cleaning-out device for common oil pipes and technological method

Abstract

The invention provides a continuous direct cycle sand cleaning-out device for common oil pipes and a technological method. The sand cleaning-out device mainly comprises a sealing cavity component and single combined components, wherein the sealing cavity component is arranged at the upper end of a wellhead device and is connected with the wellhead device via a flange; and the single combined component is matched with the sealing cavity component. The continuous direct cycle technological method comprises the following steps of calculating the depth of a required drilling plug after a sand surface / an ash surface is detected; assembling a wellhead, the sealing cavity component and the single combined components; performing direct cycle sand cleaning-out on a top and a bypass; and connecting the single combined components while direct cycle sand cleaning-out of the bypass. According to the structure of the device and the technological method, the design is reasonable, the cost is low, the device is convenient to use and maintain and is safe and reliable, the operation effect is improved greatly, environmental pollutions are reduced, and the service life of the device is long.

Description

technical field [0001] The invention relates to an ordinary oil pipe continuous positive circulation sand washing device and a process method, in particular to an ordinary oil pipe continuous positive circulation sand washing device which can complete continuous sand washing and plug drilling through the ordinary oil pipe in the oil-water well operation without stopping the pump. and process methods. Background technique [0002] In the process of sand washing and screw drilling and sweeping operations in oil and water wells, in order to prevent the floating sand or cuttings from sinking and burying the drill in the traditional connection, it often takes a long time to flush before stopping the circulation of the workover fluid to accept the order. In addition, when the plug is not flushed cleanly when the screw drill plug is not cleaned, the drill cuttings will easily get stuck in the drill and damage the screw drill; at the same time, when the workover fluid circulation is...

AI Technical Summary

Problems solved by technology

[0002]During the sand washing and screw drilling and sweeping operations of oil and water wells, when connecting single rods traditionally, in order to prevent the floating sand or cuttings from sinking and burying the drill, It often takes a long time to flush to stop the circulation of the workover fluid to connect a single piece of work; and when the plug is not flushed cleanly when the screw drills the plug, the drill cuttings flow back into the oil pipe and it is easy to jam the drill and damage the screw drill; at the same time, the circulation of the workover fluid is stopped When a single root is connected, because the casing annulus carries sand or cuttings, the density is higher than the workover fluid in the tubing, and due to the difference in density of the oil and casing fluid, a large amount of workover fluid returns from the tubing, resulting in damage to the well site environment And the working environment becomes worse, which not only greatly affects the working efficiency and causes environmental pollution

[0003] Patent No. 200610169774.2 Invention patent titled "Continuous Sand Washing Process and Continuous Sand Washing Device", which discloses "each single sand washing pipe column flushing When finished, manually and quickly close the control valve on the rig floor to stop the upward jet flow of pressure fluid in the well, and then carry out conventional single sand washing pipe string breakout and connection. After the connection is completed, manually open the control valve. Circulating sand washing operations..." This patent has the following disadvantages: 1) The control valve needs to be closed manually. During construction, if the well is under pressure or high pressure, it is very difficult to manually close the control valve, and the pressure state The water hose under the ground will vibrate or shake at high frequency, and the wellhead operator is at risk of personal injury; 2) The process must stop the pump when connecting a single piece, and he sits on the wellhead elevator after each single piece of sand is washed At this time, the control valve on the top is manually closed to prevent the backflow of the liquid in the well, because the control valve is closed, the liquid cannot be pumped into the well, and the technical purpose of continuous sand washing cannot be realized; 3) Because the process must stop the pump, during the process of stopping the pump, The sand washed up in the casing annulus may settle, resulting in a sand bridge, enclosing the oil pipe for sand washing, causing the pipe string to be stuck, and engineering accidents

[0004]Patent No. 200620020886 The utility model patent titled "Rotary Disk Driven Rotary Pressurized Continuous Sand Washing Device" has the following disadvantages: 1) First, the process must be combined with the drill pipe , kelly, because the driving method of the process is driven by the turntable on the ground, compared with the oil pipe for sand washing, the workload and labor intensity of the drill pipe is large; 2) Although the process does not need to stop the pump, it is The operation process determines that the water hose must be disconnected from the water inlet of Unicom slips during the operation, and the pump should be stopped. During this period, the pump should be stopped for about 3 minutes. When the sand in the casing annulus settles, the sand washing pipe string will be easily stuck. ;3) This process must use drill pipe for sand washing. The outer diameter of the coupling of the Ф73mm drill pipe is 105mm, while the coupling of the Ф73mm tubing is only 93mm. and other engineering accidents; 4) When the process is changed and the line / liquid flow channel is changed, manual disassembly or connection is required every time. 5) Since it passes through each drill pipe and installs a sealing valve, there is a possibility of puncture / leakage of the sealing valve in the downhole, and the ground personnel cannot detect it. In this case, there may be a risk of "short circuit" in the liquid flow. The liquid flow cannot effectively flush the downhole sand settling, or cause the sand flushed to the annulus to settle due to the short circuit of the upper drill pipe and insufficient liquid flow in the lower part. Buried sand washing pipe string, engineering accident occurred

Therefore, when he pushes the valve ball of the reversing valve upward through lateral hydraulic pressure, there may be situations such as misalignment or insufficient upward force, which will cause the upper channel to fail to close and puncture leakage on the ground; 2) The device continuously flushes the wellhead In the device assembly, there is only one reverse self-sealing rubber core in the lower part. After it passes through several oil pipes and enters the well, there may be a seal failure. When the seal fails, there is no second sealing device. At this time, the liquid flow from the inside of the assembly The space enters the Christmas tree through the puncture of the lower rubber core, and returns from the casing of the Christmas tree, but the ground personnel cannot detect it at all, and there is a certain risk

Images