Continuous gas lift drainage system and method for gas drilling
A gas drilling and gas lift technology, which is used in liquid/gas jet drilling, fluid production, earthwork drilling, etc. It can solve the problems of high professional requirements, time-consuming and labor-intensive, and low efficiency, so as to reduce requirements and production costs. , the effect of improving production efficiency
Active Publication Date: 2016-09-07
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
At present, the gas-lift drainage of long well intervals often adopts the methods of segmented gas-lift drainage and mixed-liquid gas-lift drainage. These two methods have the following problems: ①Segmented gas-lift drainage is discontinuous, low in efficiency, and time-consuming; ②Mixed liquid gas lift drainage requires additional drilling pumps, which does not give full play to the performance of gas drilling equipment, and requires construction scheme design, which requires high professionalism
Therefore, the existing methods are not conducive to reducing drilling costs and timeliness
Method used
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Embodiment Construction
[0019] The structure of the present invention will be described in detail below in conjunction with the drawings and specific embodiments.
[0020] Such as figure 1 , 2 As shown, a continuous gas lift liquid drainage system for gas drilling includes a continuous circulation valve 1005 installed on the top of the drill pipe and a diversion manifold connected thereto. The diversion manifold includes a main passage, a bypass passage and a pressure relief passage, The main passage includes a gas injection joint 1001, a second slab gate valve 1003, a main passage hydraulic valve 1101, a third slab gate valve 1102 and a main passage joint 1103 connected in sequence by pipelines; The standpipe on the top of the valve 1005 is connected; the bypass passage includes a gas injection joint 1001, a second slab gate valve 1003, a bypass passage hydraulic valve 1201 and a bypass passage joint 1204 connected in sequence with pipelines; the bypass passage joint 1204 passes through the pipelin...
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The invention discloses a continuous gas lift liquid drain system and method in the gas drilling process. The continuous gas lift liquid drain system in the gas drilling process comprises a continuous circulation valve installed on the top of a drilling rod and a distribution manifold connected with the continuous circulation valve. The distribution manifold comprises a main passage, a bypass passage and a pressure relief passage. The main passage and the bypass passage can alternately complete the gas lift liquid drainage operation, the operation of making up a joint / stand column can be carried out while the bypass passage is utilized to carry out gas lift liquid drainage operation, and therefore continuous gas lift liquid drainage is achieved. The invention further discloses a specific method for completing the continuous gas lift liquid drainage through the continuous gas lift liquid drain system and method in the gas drilling process. According to the continuous gas lift liquid drain system and method in the gas drilling process, technical advantages of sectional gas lift and technical advantages of continuous circulation are combined, the requirement of gas equipment for deep well long well section gas lift liquid drainage is reduced, and the technology of continuous circulation is adopted; consequently, production efficiency is improved greatly, and the production cost is lowered.
Description
technical field [0001] The invention relates to the field of gas drilling, in particular to a continuous gas lift liquid drainage system and method for gas drilling. Background technique [0002] Gas drilling uses air, nitrogen, natural gas, atomized or foamed liquid as the circulating medium, and drills in an underbalanced manner. It has many advantages that conventional drilling fluid drilling does not have, such as increasing the rate of penetration, controlling lost circulation, and overcoming mud. Shale water-sensitive collapse, reducing environmental pollution, and maximizing the discovery and protection of reservoirs, etc., are more and more widely used in the field of drilling. Because gas drilling has strict requirements on the formation, gas drilling is often limited to some adaptive well sections. Therefore, there must be the problem of gas-liquid conversion of the drilling circulation medium. Before the drilling fluid drilling is converted to gas drilling, all t...
Claims
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IPC IPC(8): E21B7/18E21B43/00E21B21/10
CPCE21B7/18E21B21/10E21B43/00
Inventor 魏凯马金山齐金涛魏臣兴徐海潮李征黄强郑燕阳
Owner BC P INC CHINA NAT PETROLEUM CORP