Wool-capsule well killing fluid and oil jacket together-injection rapid well killing process for natural gas well
A technology for natural gas and well killing fluid, which is applied in the field of well killing operation technology in the workover process of natural gas wells, can solve problems such as wear of wellhead pressure-resistant devices, improve well killing safety, improve well killing operation efficiency, and avoid upward channeling. ground effect
Inactive Publication Date: 2018-11-16
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
In the process of killing wells, a large amount of high-pressure gas is squeezed to the ground, which will greatly increase the risk of ground operations, and will also cause certain wear and tear on the wellhead pressure-resistant devices
Method used
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Embodiment 1
[0025] The rapid well killing process of the natural gas well with the cashmere well killing fluid oil casing co-injection, which includes the following steps:
[0026] A, the production of gas well workover with vesicle kill fluid, that is, in 1000 parts by weight of clear water, add 2.4-4.8 parts by weight of velvet agent, 7.2-14.4 parts by weight of cystic agent and 2.4-4.8 parts by weight of cholecystic agent;
[0027] The velvet agent consists of 4-6 parts by weight of petroleum grade sodium carboxymethylcellulose, 3-4 parts by weight of high molecular weight polyacrylamide, 1-2 parts by weight of cross-linked polyvinylpyrrolidone, 1-2 parts by weight Parts of industrial potassium chloride mixed;
[0028] The cystic agent is made by mixing 4-6 parts by weight of carboxymethyl starch, 1-2 parts by weight of hydroxyethyl starch, and 1-2 parts by weight of hydroxypropyl starch;
[0029] The gallbladder agent is made by mixing 1-3 parts by weight of sodium dodecylbenzenesul...
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Abstract
The invention relates to a wool-capsule well killing fluid and oil jacket together-injection rapid well killing process for a natural gas well. The process comprises the steps: under the condition ofmaintaining that the wellhead pressure of the natural gas well is not lowered, preparing wool-capsule well killing fluid for well workover of the natural gas well, wherein the wool-capsule well killing fluid has the density of 0.80g / cm<3> to 0.90g / cm<3>, the apparent viscosity of 40mPa.s to 70mPa.s and the yield point-plastic viscosity ratio of 0.90Pa / mPa.s to 1.5Pa / mPa.s and is prepared through sequentially adding 2.4 to 4.8 parts by weight of wool-capsule agent, 7.2-14.4 parts by weight of capsule agent and 2.4-4.8 parts by weight of capsule bladder agent into 1,000 parts by weight of cleanwater; and directly pumping the wool-capsule well killing fluid, of which the volume is 0.1 to 2.0 times that of a well bore, into the well bore by using a fluid pump at a pumping speed of 5m<3> / h to20m<3> / h. According to the process, oil jacket together-injection rapid well killing operation can be achieved, the efficiency of conventional natural gas well well-killing operation is effectively increased, shaft bottom gases are prevented from rising to the ground, and the safety of well killing is improved.
Description
technical field [0001] The invention relates to the technical field of natural gas well workover, in particular to a well killing process in the natural gas well workover process. Background technique [0002] After a long-term production of natural gas wells, measures such as replacement of pipe strings and salvage of fallen objects are required through workover operations. At this time, natural gas formations often have the characteristics of low pressure coefficient, early fracturing, and formation artificial fractures kept open after acidification. Conventional clean water well killing fluid has serious leakage after entering the wellbore, and the workover procedures such as replacing pipe strings and salvaging debris cannot be carried out smoothly when the wellbore is in a state of gas and high pressure. Therefore, during the workover operation of natural gas wells, it is necessary to stabilize the temporary plugging formation and implement safe well killing. [0003]...
Claims
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IPC IPC(8): C09K8/516C09K8/035E21B33/13
CPCC09K8/035C09K8/516E21B33/13
Inventor 魏攀峰郑力会
Owner CHINA UNIV OF PETROLEUM (BEIJING)