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Foam cyclic utilization method used for under balance drilling

An underbalanced drilling and foam technology, which is applied in drilling compositions, chemical instruments and methods, and earth-moving drilling, etc., can solve the problem that natural defoaming occupies a large area, cannot handle a large amount of foam, and consumes a large amount of defoamer. and other problems, to achieve the effect of convenient on-site operation, reduced drilling operation cost, and strong foaming ability

Inactive Publication Date: 2009-06-24
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical defoaming cannot handle a large amount of foam and is only suitable for some emergency measures; mechanical defoaming not only requires additional equipment, but also has a low defoaming rate; chemical defoaming method is simple in construction and high in defoaming rate, but consumes a lot of defoaming agent , high cost; natural defoaming covers a large area and takes a long time to defoam

Method used

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  • Foam cyclic utilization method used for under balance drilling
  • Foam cyclic utilization method used for under balance drilling
  • Foam cyclic utilization method used for under balance drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, brittle foam base fluid circulation experiment

[0024] The brittle foam base fluid formula is prepared by mass: 0.6% ABS+tap water. The prepared brittle foam base liquid is injected into the base liquid tank 2 and the base liquid replenishment tank 1, and the air intake volume and the foam base liquid volume of the air supply system 3 and the base liquid tank 2 are respectively adjusted on the ground, and foam generation is monitored through the foam parameter monitoring system 5 The foam generated in the foam generator 4, after the foam quality and half-life in the foam generator 4 meet the requirements, open the well entry valve 6 to inject foam into the well 7, and after the foam carrying cuttings returns to the wellhead, it is added through the additive addition system A8 The mass percentage concentration is 20%~30% CaCl 2 solution to achieve the first defoaming; the defoamed liquid is removed through the debris removal system 9, and then Na 2 CO 3...

Embodiment 2

[0027] Embodiment two, stable foam cycle experiment

[0028]The formula of stable foam base liquid is prepared by mass: 0.4% ABS+0.3% SDS+0.2% XC+0.2% CMC+tap water. Adjust the air intake and foam base fluid volume on the ground, monitor the foam quality and half-life through the foam parameter monitoring system, and open the well valve to inject foam into the well after the foam quality and half-life meet the requirements, and the foam carrying cuttings will circulate back to the wellhead , add CaCl2 solution with a mass percentage concentration of 40% through the additive addition system A to achieve the first defoaming, the defoamed liquid removes cuttings through the debris removal system, and then adds the mass percentage through the additive addition system B The Na2CO3 solution with a concentration of 50% restores the foaming ability of the foaming agent, and the foam liquid enters the foam generator again for foaming. After the foam quality and half-life meet the requi...

Embodiment 3

[0031] Embodiment three, three-phase foam circulation experiment

[0032] The formula of the three-phase foam base liquid is prepared according to the mass: 0.5% SDS+0.2% XC+0.3% CMC+5.0% bentonite+tap water. Adjust the air intake and foam base fluid volume on the ground, monitor the foam quality and half-life through the foam parameter monitoring system, and open the well valve to inject foam into the well after the foam quality and half-life meet the requirements, and the foam carrying cuttings will circulate back to the wellhead , add CaCl with a mass percentage concentration of 50% through additive addition system A 2 Solution, to achieve the first defoaming, the defoaming liquid removes cuttings through the debris removal system, and then adds Na with a mass percentage concentration of 50% through the additive addition system B 2 CO 3 solution to restore the foaming ability of the blowing agent, and the foam liquid enters the foam generator again to re-foam. After the f...

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Abstract

The invention relates to a method for cyclically utilizing foam, which is used for oil and gas exploitation, mining and non-excavation ground drilling and for the underbalanced well drilling and can increase the service efficiency of vesicant and reduce the environmental pollution and the cost of drilling fluids. The technical scheme is as follows: a cyclic foam system consists of a foam base fluid-CaCl2-Na2CO3; the foam base fluid comprises crisp foam, or stable foam, or three-phase foam; a water solution with anionic surfactant is used for the crisp foam, a water solution with the anionic surfactant and foam stabilization tackifier is used for the stable foam, and a water solution with the anionic surfactant, the foam stabilization tackifier and swell soil is used for the three-phase foam; the air input and the quantity of the foam base fluid are adjusted firstly to gain the foam, and a valve is opened to inject the foam into a well; after being cyclically led out from the mouth of the well, the foam is added with a CaCl2 water solution for defoaming; after drill chips are removed, a Na2CO3 solution is added to restore the foamability; and then the solution is led into a generator for foaming again. The method can realize multiple times of cyclic utilization of the foam base fluid, and has simple process and convenient operation.

Description

technical field [0001] The invention relates to a foam recycling method for underbalanced drilling, which is used in industries such as petroleum and natural gas exploitation, mining, and non-excavation rock and soil drilling, and realizes foaming-defoaming-refoaming of foam fluid. Background technique [0002] Foam fluid technology began in the 1950s, and domestic research and application of foam fluid drilling technology began in the 1980s, and field practice was successively obtained in Xinjiang, Shengli, Liaohe, Daqing, Changqing, Sichuan and other oilfields. The current foam drilling technology used for underbalanced drilling has problems such as a large amount of foam used at one time, and the returned foam is easy to pollute the environment, which not only increases the cost of foam drilling, but also is not conducive to the popularization and application of foam drilling technology. Foam fluid recycling has become a technical problem of common concern at home and abr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/14C09K8/38
Inventor 孟英峰万里平杨明礼李永杰陈浩李皋
Owner SOUTHWEST PETROLEUM UNIV
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