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CN-122012046-A - Isolation liquid for composite stuck drill treatment, preparation method and stuck releasing method

CN122012046ACN 122012046 ACN122012046 ACN 122012046ACN-122012046-A

Abstract

The invention discloses a spacer fluid for composite stuck drill treatment, a preparation method and an stuck releasing method, and relates to the technical field of stuck drill stuck releasing agent spacer, wherein the spacer fluid comprises 2-4% of a stabilizer, 1-2% of an emulsifying agent, 8-12% of a penetrating agent, 2-4% of calcium oxide, 0.5-1.5% of a solid defoaming agent and an oil phase. The density of the isolation liquid is 0.9-1.5 g/cm 3 , and the density of the isolation liquid is obtained by adding barite powder. The preparation method comprises the steps of uniformly mixing the components, wherein the stuck freeing method comprises a basic soaking stuck freeing method, a secondary stuck freeing method and a tertiary stuck freeing method. The invention adopts the specific isolating liquid, can form enhanced isolating effect among the oil-based unclamping liquid, the hydrochloric acid unclamping liquid and the drilling liquid, effectively reduces the mixing channeling among the oil-based unclamping liquid, the hydrochloric acid unclamping liquid and the drilling liquid, and ensures that the double-liquid unclamping agent effectively exerts the unclamping characteristic of the double-liquid unclamping agent, thereby achieving the purposes of shortening the unclamping time, improving the unclamping effect and reducing the drilling cost.

Inventors

  • ZHOU JIN
  • HU CHENG
  • LI LEI
  • JIAN XU
  • JING JING
  • WANG CHENGXUE
  • ZHANG SONG
  • HE CHAO
  • XU JIANCHAO
  • FU HUACAI

Assignees

  • 中国石油天然气集团有限公司
  • 中国石油集团川庆钻探工程有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1. The isolating liquid for the composite drilling sticking treatment is characterized by comprising the following components in parts by mass: The density of the isolation liquid is 0.9-1.5 g/cm 3 , and the density of the isolation liquid is obtained by adding barite powder.
  2. 2. The spacer fluid for composite drilling sticking treatment of claim 1, wherein the stabilizer is organic soil formed by modifying bentonite with cetyltrimethylammonium bromide.
  3. 3. The spacer fluid for composite drilling sticking treatment of claim 1, wherein the emulsifier is sorbitan oleate.
  4. 4. The spacer fluid for composite drilling sticking treatment according to claim 1, wherein the penetrating agent is one of fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene ether or two of the two mixed according to any proportion.
  5. 5. The spacer fluid for composite stuck pipe treatment of claim 1 wherein said solid antifoaming agent is aluminum stearate.
  6. 6. The spacer fluid for composite drilling sticking treatment of claim 1, wherein the oil phase is diesel oil, white oil, solvent oil or kerosene.
  7. 7. A preparation method of the spacer fluid according to any one of claims 1to 6, wherein the preparation process comprises the steps of adding an oil phase into a stirrer, adding a stabilizer, an emulsifier, a penetrating agent, calcium oxide, a solid defoaming agent and barite powder respectively, stirring at least 10min at a rotating speed of 10000r/min, and uniformly stirring to obtain a substantial amount of spacer fluid.
  8. 8. A method for releasing the isolating liquid according to any one of claims 1-6, which is based on a soaking method, is characterized in that the isolating liquid with a front seal, the hydrochloric acid releasing liquid, the isolating liquid with a rear seal and the oil-based releasing liquid are pumped in sequence in the drilling process.
  9. 9. A method for releasing the isolating liquid according to any one of claims 1-6, which is a two-stage injection replacement releasing method, is characterized in that the releasing process comprises the steps of sequentially pumping a front-closed isolating liquid, an oil-based releasing liquid, an intermediate isolating liquid, a hydrochloric acid releasing liquid and a rear-closed isolating liquid in the drilling process.
  10. 10. A method for releasing the isolating liquid according to any one of claims 1-6, which is a three-stage injection replacement releasing method, is characterized in that the isolating liquid with a front sealing, the oil-based releasing liquid, the isolating liquid with an intermediate isolation, the hydrochloric acid releasing liquid, the isolating liquid with an intermediate isolation, the oil-based releasing liquid and the isolating liquid with a rear sealing are pumped in sequence in the drilling process.

Description

Isolation liquid for composite stuck drill treatment, preparation method and stuck releasing method Technical Field The invention relates to the technical field of stuck releasing agent isolation, in particular to an isolating liquid for composite stuck treatment, a preparation method and a stuck releasing method. Background Chongqing of Sichuan in the Eastern Mountain temple, jialing river, kappy, bamboo temple and other carbonate strata, multiple pressure systems and high and low pressure coexist, so that differential pressure sticking is easy to occur in practical construction. In the drilling process, the blocks are dropped, the blocks form hard stuck drills, and if the hard stuck drills are not treated timely, stuck drills are easily adhered, so that the composite stuck drills with the block dropping and pressure difference adhesion are formed. The current composite stuck drill is only treated by soaking stuck solution or hydrochloric acid, and although the problem of pressure difference adhesion can be solved by adopting stuck solution for soaking, hard stuck cannot be effectively relieved. The hard card can be removed by adopting hydrochloric acid soaking, but the effects of factors such as acid liquor concentration, soaking amount, soaking time, construction pressure and the like are large, well leakage is aggravated by long-term soaking, and well control risks are increased while soaking fails. Therefore, based on the application limitation of the conventional single-treatment stuck drill such as stuck solution, acid solution and the like, the composite sticking drill in the Chongqing area can not meet the sticking release requirement. In order to better process the composite stuck drill, a technical scheme for processing the composite stuck drill by adopting a double-liquid stuck releasing agent of hydrochloric acid stuck releasing liquid and oil-based stuck releasing liquid is provided in the prior art, and the composite stuck drill can be better processed by adopting the double-liquid stuck releasing agent through practical application. However, in practical application, the inventor also finds that the technical problem of mixed channeling pollution among hydrochloric acid uncapping liquid, oil-based uncapping liquid and drilling fluid can not be effectively solved, particularly in a large borehole with a diameter of 311.2mm or more, the contact area of various liquids is large, so that the mixed channeling pollution amount among various liquids is increased, the uncapping time and the uncapping effect of the composite stuck drill are affected, and the fault processing time and the drilling cost are prolonged. Disclosure of Invention In order to overcome the problems in the prior art, the invention provides the isolating liquid for the composite stuck drill treatment, the preparation method and the stuck-releasing method, wherein the isolating liquid can form an enhanced isolating effect among the oil-based stuck-releasing liquid, the hydrochloric acid stuck-releasing liquid and the drilling fluid, and effectively reduce the mixing channeling among the oil-based stuck-releasing liquid, the hydrochloric acid stuck-releasing liquid and the drilling fluid, so that the double-liquid stuck-releasing agent effectively exerts the stuck-releasing characteristic of the double-liquid stuck-releasing agent, and the purposes of shortening the stuck-releasing time, improving the stuck-releasing effect and reducing the drilling cost are achieved. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: in a first aspect, the invention provides a spacer fluid for composite drilling sticking treatment, which comprises the following components in parts by mass: The density of the isolation liquid is 0.9-1.5 g/cm 3, and the density of the isolation liquid is obtained by adding barite powder. The stabilizer is organic soil formed by modifying bentonite by cetyl trimethyl ammonium bromide. The emulsifier is sorbitan oleate. The penetrating agent is one of fatty alcohol polyoxyethylene ether and alkylphenol polyoxyethylene ether or two of the two mixed according to any proportion. The solid defoaming agent is aluminum stearate. The oil phase is diesel oil, white oil, solvent oil or kerosene. In a second aspect, the invention provides a preparation method of a spacer fluid, which comprises the steps of adding an oil phase into a stirrer, adding a stabilizer, an emulsifier, a penetrating agent, calcium oxide, a solid defoaming agent and barite powder respectively, stirring at a rotating speed of 10000r/min for at least 10min, and uniformly stirring to obtain a large amount of spacer fluid. In a third aspect, the invention provides an isolating liquid-based unlocking method, which is based on a soaking unlocking method, and comprises the following steps of sequentially pumping a front-closed isolating liquid, a hydrochloric acid unlocking liquid, a rear-closed isolating liqui