Di-kalium ion-polymer drilling fluid with strong rejection capability

A technology of potassium ion and strong suppression, applied in the field of drilling fluid, can solve the problems of high solid phase content, drill tool drop, low ROP, etc.

Inactive Publication Date: 2009-05-13
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, coarse dispersion and fine dispersion drilling fluid systems are mostly used in drilling operations. This system has the following disadvantages: high solid phase content, low mechanical penetration rate, easy hydration expansion and cross collapse of mudstone, resulting in wellbore shrinkage. diameter, the tripping and tripping encounter resistance or the torque is too large when drilling, and in severe cases, the well wall collapses, and even the downhole accidents such as falling of the drilling tool are caused by the collapse

Method used

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  • Di-kalium ion-polymer drilling fluid with strong rejection capability
  • Di-kalium ion-polymer drilling fluid with strong rejection capability
  • Di-kalium ion-polymer drilling fluid with strong rejection capability

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0073] Example 1 is composed of the above-mentioned invented strong inhibitory dipotassium ion-polymer drilling fluid new system, and its formula composition is shown in Table 6. The formula composition described in ② is prepared on site according to the above-mentioned preparation procedure. Field tests were carried out in 7 wells, among which the results obtained in well CB4-1 are as follows:

[0074] 1. Improve drilling fluid inhibition and stabilize wellbore effect

[0075] ①. Since KPAM and KCL are added to the mud at the ratio of laboratory research, the inhibition and anti-slump of the drilling fluid are greatly increased and the quality of the mud cake is improved. At the same time, the water loss of the drilling fluid is reduced to about 5ml. After 3000 meters, The water loss was further reduced to 3ml. In the whole process of drilling the 121 / 4″ large-scale long open hole section of Well CB4-1, the cumulative reaming of tripping and tripping only took 30 hours, while...

example 2

[0089] Example 2 consists of the above-mentioned invented strong inhibitory dipotassium ion-polymer drilling fluid new system. Its formula composition is shown in Table 6. The formula composition described in ① is prepared on site according to the above-mentioned preparation procedure. The field test of 2 wells has been carried out, and the application in Jingping 16-14 has the following effects:

[0090] ①.Performance of drilling fluid in use:

[0091] Table 7: Example 2 drilling fluid performance table

[0092]

[0093] ②. Shale recovery test

[0094] Samples of dipotassium ion polymer drilling fluids from different formations were taken from the site where they were used, and the shale recovery rate test was carried out to observe its inhibitory effect on shale. It can be seen from the data in the table below that the on-site dipotassium ion polymer drilling fluid system shows very strong shale inhibition in field use, and the average primary recovery rate exceeds 90%....

example 3

[0111] Example 3 consists of the above-mentioned invented strong inhibitory dipotassium ion-polymer drilling fluid new system, and its formula composition is shown in Table 6. The formula composition described in 3. is prepared on site according to the above-mentioned preparation procedure. The field test of 2 wells was carried out, and the application in Shuangping 18-3 also achieved good results, as shown in Table 7.

[0112] In the application of the three examples, the system also exhibits good anti-slump inhibition, lubrication, low solid phase, high penetration rate, and the average mechanical penetration rate is 5 m / hour. During the drilling process, the wellbore was good, and the downhole was always normal. After drilling, the electrical measurement showed that the wellbore was regular. Table 11 and Table 12 describe the drilling fluid properties of Example 2 and Example 3 applied in the field.

[0113] Table 11: Application of Example 2 in Jingping 16-14

[0114] ...

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Abstract

The invention relates to a strong inhibition double-kalium ion, namely polymer drilling fluid, which is characterized in that the strong inhibition double-kalium ion, namely polymer drilling fluid comprises the following materials in weight percentage: A. 7 to 9 percent of inorganic kali salt used as an inorganic inhibitor; B. 0.5 to 0.6 percent of organic kali salt used as an organic inhibitor; C. 0.3 to 0.5 percent of viscidity improving agent; D. 0.3 to 0.5 percent of filter loss reducing agent; E. 0.3 to 0.5 percent of alkalinity controlling agent; F. 0.03 to 0.1 percent of preservative agent; G. 0.1 to 0.2 percent of antifoaming agent; H. 1 to 8 percent of weight additive; and the balance being water. The drilling fluid has stronger functions of inhibiting hydration, expansion and dispersion of clay mineral, and also has better rheological property, so that the drilling fluid is low filter loss non-solid phase polymer drilling fluid.

Description

technical field [0001] The invention belongs to a drilling fluid, in particular to a water-based drilling fluid with strong inhibitory dipotassium ion-polymer drilling fluid that inhibits the hydration expansion of mud shale. Background technique [0002] As we all know, drilling fluid is the blood of drilling and plays a very important role in oil drilling. Water-based drilling fluid has experienced the development process from coarse dispersion drilling fluid, fine dispersion drilling fluid to non-dispersion drilling fluid. At present, coarse dispersion and fine dispersion drilling fluid systems are mostly used in drilling operations. This system has the following disadvantages: high solid phase content, low mechanical penetration rate, easy hydration expansion and cross collapse of mudstone, resulting in wellbore shrinkage. diameter, the tripping and tripping encounter resistance or the torque is too large when drilling, and in severe cases, the well wall collapses, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/10
Inventor 杨斌陈在君金祥哲吴满祥张小平赵文军林海高洁付微风刘伟赵向阳曹辉张振活李慧升
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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