A Secondary Dynamic Negative Pressure Perforation Method by Liquid Injection and Pressurization
A negative pressure perforation and dynamic technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of reducing permeability and dynamic negative pressure perforation technology can not be applied to oil and gas reservoirs, etc., to improve Permeability, the effect of avoiding pore damage
Active Publication Date: 2018-08-21
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology
However, the dynamic negative pressure perforation technology is not applicable to all oil and gas reservoirs, especially low-permeability gas-bearing reservoirs. The surge flow caused by negative pressure can only make the perforation channel close to the wellbore or the broken rock compaction zone near the cement sheath. However, the compacted zone in most of the perforation tunnels far away from the wellbore cannot be cleaned up. The broken rocks in the tunnels of this length are partially blocked after the compaction of the gas seepage tunnels. reduce permeability
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[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0017] Such as figure 1 As shown, the well is completed in low permeability oil and gas reservoir rock 1, and the wellbore contains a certain level of killing fluid 4. In the perforating gun I, the small 1-meter perforating charge 2 is installed on the support perforating charge support 7 to perform spiral perforation or fixed-point perforation, and the spiral support or fixed-point support can be selected according to actual needs. After the perforating gun equipped with low-density perforating bullets is installed, the perforating gun is lowered to the perforation section of the oil and gas reservoir by the cable 8 for perforation. After the perforating bullet is detonated, the metal jet produced penetrates the perforating gun After the casing 3, the casing 5 and the cement sheath 6 penetrate through the rock 1 of the oil and gas reservoir, ...
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The invention discloses a liquid injection pressurization secondary dynamic negative pressure perforating method. The method comprises the steps that pores and microcracks of a low-permeability oil and gas reservoir reach a saturated state through a wettability reversal agent; after the wettability reversal agent is permeated into a certain area, a perforating gun with a pressure relief cavity is lowered to the downhole; dynamic negative pressure perforating is conducted at the same position, flashy flow generated by negative pressure in a perforating channel can completely and effectively remove a compaction band and chips in the perforating channel, and the defect that after dynamic negative pressure perforating is conducted in the low-permeability oil and gas reservoir once, only the compaction band close to the wellbore segment perforating channel can be removed is overcome; in dynamic negative pressure perforating on the low-permeability oil and gas reservoir, the wettability reversal agent is applied, therefore, the permeability of the oil and gas reservoir can be effectively improved, and channel destruction, caused by dynamic negative pressure perforating, in undestroyed reservoir rock near the perforating channel and permeability reduction caused by water locking are avoided.
Description
technical field [0001] The technology of the invention relates to a method of liquid injection pressurization and secondary dynamic negative pressure perforation for improving the oil and gas recovery rate of low-permeability oil-gas reservoirs, and is especially suitable for perforation and completion of low-permeability gas-bearing reservoirs. Background technique [0002] Dynamic negative pressure perforation technology is a well completion method that can clean up the compaction zone and debris in the perforation tunnel and improve oil and gas recovery. It is characterized in that a pressure relief chamber is installed near the perforating gun, and when the perforating gun is detonated, the pressure relief chamber is detonated at the same time to realize the through hole. The negative pressure caused by the through-hole of the pressure relief chamber makes the metal jet debris and broken rock in the perforation tunnel flow into the casing due to the pressure fluctuation ...
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IPC IPC(8): E21B43/116E21B43/119
CPCE21B43/116E21B43/119
Inventor 咸玉席卢德唐刘建武温杰雄
Owner UNIV OF SCI & TECH OF CHINA