Plugging material and plugging slurry for protecting reservoir stratum with low fracturing fracture ability
A plugging material and reservoir technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of low plugging success rate, increase the static pressure of liquid column, increase the degree of leakage, etc., and achieve improved plugging leakage success rate, balanced formation pressure, good plugging effect
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Embodiment 1
[0027] The plugging slurry for protecting low-pressure fractured reservoirs in this embodiment is composed of the following components in parts by weight: 2 parts of walnut shells with a particle size of 7-20 mesh, 3 parts of walnut shells with a particle size of 5-7 mesh, 2 parts of composite plugging agent FD-2, 1.5 parts of rigid lost circulation plugging agent GXD for drilling, 3 parts of fine-grained acid-soluble shielding temporary plugging agent RFD-1, 2 parts of medium-grained acid-soluble plugging agent RFD -2, 4 parts of high water loss plugging agent R-19, 0.3 part of calcium oxide, 100 parts of water.
[0028] The preparation method of the plugging slurry is as follows: adding the raw materials of each component except water into water, and mixing uniformly.
Embodiment 2
[0030] The plugging slurry for protecting low-pressure fractured reservoirs in this embodiment is composed of the following components in parts by weight: 3 parts of walnut shells with a particle size of 7-20 mesh, 3 parts of walnut shells with a particle size of 5-7 mesh, 3 parts of composite plugging agent FD-2, 2 parts of rigid lost circulation plugging agent GXD for drilling, 2 parts of fine-grained acid-soluble shielding temporary plugging agent RFD-1, 2 parts of medium-grained acid-soluble plugging agent RFD -2, 5 parts of high water loss plugging agent R-19, 0.2 part of calcium oxide, 100 parts of water.
[0031] The preparation method of the plugging slurry is as follows: adding the raw materials of each component except water into water, and mixing uniformly.
experiment example 1
[0032] Experimental example 1 (indoor experiment)
[0033] In this experimental example, the plugging performance of the plugging slurry in Example 2 is tested.
[0034] The experimental method is as follows:
[0035] 1) Take the amount of water in the formula, add soda ash, sodium sulfite, high viscosity sodium carboxymethylcellulose (HV-CMC), and potassium polyacrylate (K-PAM) in sequence, stir at high speed for 10 hours until they are evenly mixed, and then cover and seal. Stand still for 24h to obtain the base slurry;
[0036] In the base slurry, relative to 100 parts by weight of water, the consumption of soda ash is 0.3 parts by weight, the consumption of Naben soil is 5 parts by weight, the consumption of HV-CMC is 0.3 parts by weight, and the consumption of K-PAM is 0.3 parts by weight;
[0037] 2) Add walnut shells, composite plugging agent, plugging agent while drilling, acid-soluble plugging agent, high water loss plugging agent and calcium oxide to the base slurr...
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